Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

internal/gopsutil/LICENSE

@@ -0,0 +1,61 @@
+gopsutil is distributed under BSD license reproduced below.
+
+Copyright (c) 2014, WAKAYAMA Shirou
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+ * Neither the name of the gopsutil authors nor the names of its contributors
+   may be used to endorse or promote products derived from this software without
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+-------
+internal/common/binary.go in the gopsutil is copied and modifid from golang/encoding/binary.go.
+
+
+
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

internal/gopsutil/common/binary.go

@@ -0,0 +1,636 @@
+package common
+
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package binary implements simple translation between numbers and byte
+// sequences and encoding and decoding of varints.
+//
+// Numbers are translated by reading and writing fixed-size values.
+// A fixed-size value is either a fixed-size arithmetic
+// type (int8, uint8, int16, float32, complex64, ...)
+// or an array or struct containing only fixed-size values.
+//
+// The varint functions encode and decode single integer values using
+// a variable-length encoding; smaller values require fewer bytes.
+// For a specification, see
+// http://code.google.com/apis/protocolbuffers/docs/encoding.html.
+//
+// This package favors simplicity over efficiency. Clients that require
+// high-performance serialization, especially for large data structures,
+// should look at more advanced solutions such as the encoding/gob
+// package or protocol buffers.
+import (
+	"errors"
+	"io"
+	"math"
+	"reflect"
+)
+
+// A ByteOrder specifies how to convert byte sequences into
+// 16-, 32-, or 64-bit unsigned integers.
+type ByteOrder interface {
+	Uint16([]byte) uint16
+	Uint32([]byte) uint32
+	Uint64([]byte) uint64
+	PutUint16([]byte, uint16)
+	PutUint32([]byte, uint32)
+	PutUint64([]byte, uint64)
+	String() string
+}
+
+// LittleEndian is the little-endian implementation of ByteOrder.
+var LittleEndian littleEndian
+
+// BigEndian is the big-endian implementation of ByteOrder.
+var BigEndian bigEndian
+
+type littleEndian struct{}
+
+func (littleEndian) Uint16(b []byte) uint16 { return uint16(b[0]) | uint16(b[1])<<8 }
+
+func (littleEndian) PutUint16(b []byte, v uint16) {
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+}
+
+func (littleEndian) Uint32(b []byte) uint32 {
+	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}
+
+func (littleEndian) PutUint32(b []byte, v uint32) {
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+}
+
+func (littleEndian) Uint64(b []byte) uint64 {
+	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
+
+func (littleEndian) PutUint64(b []byte, v uint64) {
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+	b[4] = byte(v >> 32)
+	b[5] = byte(v >> 40)
+	b[6] = byte(v >> 48)
+	b[7] = byte(v >> 56)
+}
+
+func (littleEndian) String() string { return "LittleEndian" }
+
+func (littleEndian) GoString() string { return "binary.LittleEndian" }
+
+type bigEndian struct{}
+
+func (bigEndian) Uint16(b []byte) uint16 { return uint16(b[1]) | uint16(b[0])<<8 }
+
+func (bigEndian) PutUint16(b []byte, v uint16) {
+	b[0] = byte(v >> 8)
+	b[1] = byte(v)
+}
+
+func (bigEndian) Uint32(b []byte) uint32 {
+	return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
+}
+
+func (bigEndian) PutUint32(b []byte, v uint32) {
+	b[0] = byte(v >> 24)
+	b[1] = byte(v >> 16)
+	b[2] = byte(v >> 8)
+	b[3] = byte(v)
+}
+
+func (bigEndian) Uint64(b []byte) uint64 {
+	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
+		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
+}
+
+func (bigEndian) PutUint64(b []byte, v uint64) {
+	b[0] = byte(v >> 56)
+	b[1] = byte(v >> 48)
+	b[2] = byte(v >> 40)
+	b[3] = byte(v >> 32)
+	b[4] = byte(v >> 24)
+	b[5] = byte(v >> 16)
+	b[6] = byte(v >> 8)
+	b[7] = byte(v)
+}
+
+func (bigEndian) String() string { return "BigEndian" }
+
+func (bigEndian) GoString() string { return "binary.BigEndian" }
+
+// Read reads structured binary data from r into data.
+// Data must be a pointer to a fixed-size value or a slice
+// of fixed-size values.
+// Bytes read from r are decoded using the specified byte order
+// and written to successive fields of the data.
+// When reading into structs, the field data for fields with
+// blank (_) field names is skipped; i.e., blank field names
+// may be used for padding.
+// When reading into a struct, all non-blank fields must be exported.
+func Read(r io.Reader, order ByteOrder, data interface{}) error {
+	// Fast path for basic types and slices.
+	if n := intDataSize(data); n != 0 {
+		var b [8]byte
+		var bs []byte
+		if n > len(b) {
+			bs = make([]byte, n)
+		} else {
+			bs = b[:n]
+		}
+		if _, err := io.ReadFull(r, bs); err != nil {
+			return err
+		}
+		switch data := data.(type) {
+		case *int8:
+			*data = int8(b[0])
+		case *uint8:
+			*data = b[0]
+		case *int16:
+			*data = int16(order.Uint16(bs))
+		case *uint16:
+			*data = order.Uint16(bs)
+		case *int32:
+			*data = int32(order.Uint32(bs))
+		case *uint32:
+			*data = order.Uint32(bs)
+		case *int64:
+			*data = int64(order.Uint64(bs))
+		case *uint64:
+			*data = order.Uint64(bs)
+		case []int8:
+			for i, x := range bs { // Easier to loop over the input for 8-bit values.
+				data[i] = int8(x)
+			}
+		case []uint8:
+			copy(data, bs)
+		case []int16:
+			for i := range data {
+				data[i] = int16(order.Uint16(bs[2*i:]))
+			}
+		case []uint16:
+			for i := range data {
+				data[i] = order.Uint16(bs[2*i:])
+			}
+		case []int32:
+			for i := range data {
+				data[i] = int32(order.Uint32(bs[4*i:]))
+			}
+		case []uint32:
+			for i := range data {
+				data[i] = order.Uint32(bs[4*i:])
+			}
+		case []int64:
+			for i := range data {
+				data[i] = int64(order.Uint64(bs[8*i:]))
+			}
+		case []uint64:
+			for i := range data {
+				data[i] = order.Uint64(bs[8*i:])
+			}
+		}
+		return nil
+	}
+
+	// Fallback to reflect-based decoding.
+	v := reflect.ValueOf(data)
+	size := -1
+	switch v.Kind() {
+	case reflect.Ptr:
+		v = v.Elem()
+		size = dataSize(v)
+	case reflect.Slice:
+		size = dataSize(v)
+	}
+	if size < 0 {
+		return errors.New("binary.Read: invalid type " + reflect.TypeOf(data).String())
+	}
+	d := &decoder{order: order, buf: make([]byte, size)}
+	if _, err := io.ReadFull(r, d.buf); err != nil {
+		return err
+	}
+	d.value(v)
+	return nil
+}
+
+// Write writes the binary representation of data into w.
+// Data must be a fixed-size value or a slice of fixed-size
+// values, or a pointer to such data.
+// Bytes written to w are encoded using the specified byte order
+// and read from successive fields of the data.
+// When writing structs, zero values are written for fields
+// with blank (_) field names.
+func Write(w io.Writer, order ByteOrder, data interface{}) error {
+	// Fast path for basic types and slices.
+	if n := intDataSize(data); n != 0 {
+		var b [8]byte
+		var bs []byte
+		if n > len(b) {
+			bs = make([]byte, n)
+		} else {
+			bs = b[:n]
+		}
+		switch v := data.(type) {
+		case *int8:
+			bs = b[:1]
+			b[0] = byte(*v)
+		case int8:
+			bs = b[:1]
+			b[0] = byte(v)
+		case []int8:
+			for i, x := range v {
+				bs[i] = byte(x)
+			}
+		case *uint8:
+			bs = b[:1]
+			b[0] = *v
+		case uint8:
+			bs = b[:1]
+			b[0] = byte(v)
+		case []uint8:
+			bs = v
+		case *int16:
+			bs = b[:2]
+			order.PutUint16(bs, uint16(*v))
+		case int16:
+			bs = b[:2]
+			order.PutUint16(bs, uint16(v))
+		case []int16:
+			for i, x := range v {
+				order.PutUint16(bs[2*i:], uint16(x))
+			}
+		case *uint16:
+			bs = b[:2]
+			order.PutUint16(bs, *v)
+		case uint16:
+			bs = b[:2]
+			order.PutUint16(bs, v)
+		case []uint16:
+			for i, x := range v {
+				order.PutUint16(bs[2*i:], x)
+			}
+		case *int32:
+			bs = b[:4]
+			order.PutUint32(bs, uint32(*v))
+		case int32:
+			bs = b[:4]
+			order.PutUint32(bs, uint32(v))
+		case []int32:
+			for i, x := range v {
+				order.PutUint32(bs[4*i:], uint32(x))
+			}
+		case *uint32:
+			bs = b[:4]
+			order.PutUint32(bs, *v)
+		case uint32:
+			bs = b[:4]
+			order.PutUint32(bs, v)
+		case []uint32:
+			for i, x := range v {
+				order.PutUint32(bs[4*i:], x)
+			}
+		case *int64:
+			bs = b[:8]
+			order.PutUint64(bs, uint64(*v))
+		case int64:
+			bs = b[:8]
+			order.PutUint64(bs, uint64(v))
+		case []int64:
+			for i, x := range v {
+				order.PutUint64(bs[8*i:], uint64(x))
+			}
+		case *uint64:
+			bs = b[:8]
+			order.PutUint64(bs, *v)
+		case uint64:
+			bs = b[:8]
+			order.PutUint64(bs, v)
+		case []uint64:
+			for i, x := range v {
+				order.PutUint64(bs[8*i:], x)
+			}
+		}
+		_, err := w.Write(bs)
+		return err
+	}
+
+	// Fallback to reflect-based encoding.
+	v := reflect.Indirect(reflect.ValueOf(data))
+	size := dataSize(v)
+	if size < 0 {
+		return errors.New("binary.Write: invalid type " + reflect.TypeOf(data).String())
+	}
+	buf := make([]byte, size)
+	e := &encoder{order: order, buf: buf}
+	e.value(v)
+	_, err := w.Write(buf)
+	return err
+}
+
+// Size returns how many bytes Write would generate to encode the value v, which
+// must be a fixed-size value or a slice of fixed-size values, or a pointer to such data.
+// If v is neither of these, Size returns -1.
+func Size(v interface{}) int {
+	return dataSize(reflect.Indirect(reflect.ValueOf(v)))
+}
+
+// dataSize returns the number of bytes the actual data represented by v occupies in memory.
+// For compound structures, it sums the sizes of the elements. Thus, for instance, for a slice
+// it returns the length of the slice times the element size and does not count the memory
+// occupied by the header. If the type of v is not acceptable, dataSize returns -1.
+func dataSize(v reflect.Value) int {
+	if v.Kind() == reflect.Slice {
+		if s := sizeof(v.Type().Elem()); s >= 0 {
+			return s * v.Len()
+		}
+		return -1
+	}
+	return sizeof(v.Type())
+}
+
+// sizeof returns the size >= 0 of variables for the given type or -1 if the type is not acceptable.
+func sizeof(t reflect.Type) int {
+	switch t.Kind() {
+	case reflect.Array:
+		if s := sizeof(t.Elem()); s >= 0 {
+			return s * t.Len()
+		}
+
+	case reflect.Struct:
+		sum := 0
+		for i, n := 0, t.NumField(); i < n; i++ {
+			s := sizeof(t.Field(i).Type)
+			if s < 0 {
+				return -1
+			}
+			sum += s
+		}
+		return sum
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+		reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128, reflect.Ptr:
+		return int(t.Size())
+	}
+
+	return -1
+}
+
+type coder struct {
+	order ByteOrder
+	buf   []byte
+}
+
+type (
+	decoder coder
+	encoder coder
+)
+
+func (d *decoder) uint8() uint8 {
+	x := d.buf[0]
+	d.buf = d.buf[1:]
+	return x
+}
+
+func (e *encoder) uint8(x uint8) {
+	e.buf[0] = x
+	e.buf = e.buf[1:]
+}
+
+func (d *decoder) uint16() uint16 {
+	x := d.order.Uint16(d.buf[0:2])
+	d.buf = d.buf[2:]
+	return x
+}
+
+func (e *encoder) uint16(x uint16) {
+	e.order.PutUint16(e.buf[0:2], x)
+	e.buf = e.buf[2:]
+}
+
+func (d *decoder) uint32() uint32 {
+	x := d.order.Uint32(d.buf[0:4])
+	d.buf = d.buf[4:]
+	return x
+}
+
+func (e *encoder) uint32(x uint32) {
+	e.order.PutUint32(e.buf[0:4], x)
+	e.buf = e.buf[4:]
+}
+
+func (d *decoder) uint64() uint64 {
+	x := d.order.Uint64(d.buf[0:8])
+	d.buf = d.buf[8:]
+	return x
+}
+
+func (e *encoder) uint64(x uint64) {
+	e.order.PutUint64(e.buf[0:8], x)
+	e.buf = e.buf[8:]
+}
+
+func (d *decoder) int8() int8 { return int8(d.uint8()) }
+
+func (e *encoder) int8(x int8) { e.uint8(uint8(x)) }
+
+func (d *decoder) int16() int16 { return int16(d.uint16()) }
+
+func (e *encoder) int16(x int16) { e.uint16(uint16(x)) }
+
+func (d *decoder) int32() int32 { return int32(d.uint32()) }
+
+func (e *encoder) int32(x int32) { e.uint32(uint32(x)) }
+
+func (d *decoder) int64() int64 { return int64(d.uint64()) }
+
+func (e *encoder) int64(x int64) { e.uint64(uint64(x)) }
+
+func (d *decoder) value(v reflect.Value) {
+	switch v.Kind() {
+	case reflect.Array:
+		l := v.Len()
+		for i := 0; i < l; i++ {
+			d.value(v.Index(i))
+		}
+
+	case reflect.Struct:
+		t := v.Type()
+		l := v.NumField()
+		for i := 0; i < l; i++ {
+			// Note: Calling v.CanSet() below is an optimization.
+			// It would be sufficient to check the field name,
+			// but creating the StructField info for each field is
+			// costly (run "go test -bench=ReadStruct" and compare
+			// results when making changes to this code).
+			if v := v.Field(i); v.CanSet() || t.Field(i).Name != "_" {
+				d.value(v)
+			} else {
+				d.skip(v)
+			}
+		}
+
+	case reflect.Slice:
+		l := v.Len()
+		for i := 0; i < l; i++ {
+			d.value(v.Index(i))
+		}
+
+	case reflect.Int8:
+		v.SetInt(int64(d.int8()))
+	case reflect.Int16:
+		v.SetInt(int64(d.int16()))
+	case reflect.Int32:
+		v.SetInt(int64(d.int32()))
+	case reflect.Int64:
+		v.SetInt(d.int64())
+
+	case reflect.Uint8:
+		v.SetUint(uint64(d.uint8()))
+	case reflect.Uint16:
+		v.SetUint(uint64(d.uint16()))
+	case reflect.Uint32:
+		v.SetUint(uint64(d.uint32()))
+	case reflect.Uint64:
+		v.SetUint(d.uint64())
+
+	case reflect.Float32:
+		v.SetFloat(float64(math.Float32frombits(d.uint32())))
+	case reflect.Float64:
+		v.SetFloat(math.Float64frombits(d.uint64()))
+
+	case reflect.Complex64:
+		v.SetComplex(complex(
+			float64(math.Float32frombits(d.uint32())),
+			float64(math.Float32frombits(d.uint32())),
+		))
+	case reflect.Complex128:
+		v.SetComplex(complex(
+			math.Float64frombits(d.uint64()),
+			math.Float64frombits(d.uint64()),
+		))
+	}
+}
+
+func (e *encoder) value(v reflect.Value) {
+	switch v.Kind() {
+	case reflect.Array:
+		l := v.Len()
+		for i := 0; i < l; i++ {
+			e.value(v.Index(i))
+		}
+
+	case reflect.Struct:
+		t := v.Type()
+		l := v.NumField()
+		for i := 0; i < l; i++ {
+			// see comment for corresponding code in decoder.value()
+			if v := v.Field(i); v.CanSet() || t.Field(i).Name != "_" {
+				e.value(v)
+			} else {
+				e.skip(v)
+			}
+		}
+
+	case reflect.Slice:
+		l := v.Len()
+		for i := 0; i < l; i++ {
+			e.value(v.Index(i))
+		}
+
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		switch v.Type().Kind() {
+		case reflect.Int8:
+			e.int8(int8(v.Int()))
+		case reflect.Int16:
+			e.int16(int16(v.Int()))
+		case reflect.Int32:
+			e.int32(int32(v.Int()))
+		case reflect.Int64:
+			e.int64(v.Int())
+		}
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		switch v.Type().Kind() {
+		case reflect.Uint8:
+			e.uint8(uint8(v.Uint()))
+		case reflect.Uint16:
+			e.uint16(uint16(v.Uint()))
+		case reflect.Uint32:
+			e.uint32(uint32(v.Uint()))
+		case reflect.Uint64:
+			e.uint64(v.Uint())
+		}
+
+	case reflect.Float32, reflect.Float64:
+		switch v.Type().Kind() {
+		case reflect.Float32:
+			e.uint32(math.Float32bits(float32(v.Float())))
+		case reflect.Float64:
+			e.uint64(math.Float64bits(v.Float()))
+		}
+
+	case reflect.Complex64, reflect.Complex128:
+		switch v.Type().Kind() {
+		case reflect.Complex64:
+			x := v.Complex()
+			e.uint32(math.Float32bits(float32(real(x))))
+			e.uint32(math.Float32bits(float32(imag(x))))
+		case reflect.Complex128:
+			x := v.Complex()
+			e.uint64(math.Float64bits(real(x)))
+			e.uint64(math.Float64bits(imag(x)))
+		}
+	}
+}
+
+func (d *decoder) skip(v reflect.Value) {
+	d.buf = d.buf[dataSize(v):]
+}
+
+func (e *encoder) skip(v reflect.Value) {
+	n := dataSize(v)
+	for i := range e.buf[0:n] {
+		e.buf[i] = 0
+	}
+	e.buf = e.buf[n:]
+}
+
+// intDataSize returns the size of the data required to represent the data when encoded.
+// It returns zero if the type cannot be implemented by the fast path in Read or Write.
+func intDataSize(data interface{}) int {
+	switch data := data.(type) {
+	case int8, *int8, *uint8:
+		return 1
+	case []int8:
+		return len(data)
+	case []uint8:
+		return len(data)
+	case int16, *int16, *uint16:
+		return 2
+	case []int16:
+		return 2 * len(data)
+	case []uint16:
+		return 2 * len(data)
+	case int32, *int32, *uint32:
+		return 4
+	case []int32:
+		return 4 * len(data)
+	case []uint32:
+		return 4 * len(data)
+	case int64, *int64, *uint64:
+		return 8
+	case []int64:
+		return 8 * len(data)
+	case []uint64:
+		return 8 * len(data)
+	}
+	return 0
+}

internal/gopsutil/common/common.go

@@ -0,0 +1,379 @@
+package common
+
+//
+// gopsutil is a port of psutil(http://pythonhosted.org/psutil/).
+// This covers these architectures.
+//  - linux (amd64, arm)
+//  - freebsd (amd64)
+//  - windows (amd64)
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	Timeout    = 3 * time.Second
+	ErrTimeout = errors.New("command timed out")
+)
+
+type Invoker interface {
+	Command(string, ...string) ([]byte, error)
+	CommandWithContext(context.Context, string, ...string) ([]byte, error)
+}
+
+type Invoke struct{}
+
+func (i Invoke) Command(name string, arg ...string) ([]byte, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), Timeout)
+	defer cancel()
+	return i.CommandWithContext(ctx, name, arg...)
+}
+
+func (i Invoke) CommandWithContext(ctx context.Context, name string, arg ...string) ([]byte, error) {
+	cmd := exec.CommandContext(ctx, name, arg...)
+
+	var buf bytes.Buffer
+	cmd.Stdout = &buf
+	cmd.Stderr = &buf
+
+	if err := cmd.Start(); err != nil {
+		return buf.Bytes(), err
+	}
+
+	if err := cmd.Wait(); err != nil {
+		return buf.Bytes(), err
+	}
+
+	return buf.Bytes(), nil
+}
+
+type FakeInvoke struct {
+	Suffix string // Suffix species expected file name suffix such as "fail"
+	Error  error  // If Error specfied, return the error.
+}
+
+// Command in FakeInvoke returns from expected file if exists.
+func (i FakeInvoke) Command(name string, arg ...string) ([]byte, error) {
+	if i.Error != nil {
+		return []byte{}, i.Error
+	}
+
+	arch := runtime.GOOS
+
+	commandName := filepath.Base(name)
+
+	fname := strings.Join(append([]string{commandName}, arg...), "")
+	fname = url.QueryEscape(fname)
+	fpath := path.Join("testdata", arch, fname)
+	if i.Suffix != "" {
+		fpath += "_" + i.Suffix
+	}
+	if PathExists(fpath) {
+		return os.ReadFile(fpath)
+	}
+	return []byte{}, fmt.Errorf("could not find testdata: %s", fpath)
+}
+
+func (i FakeInvoke) CommandWithContext(ctx context.Context, name string, arg ...string) ([]byte, error) {
+	return i.Command(name, arg...)
+}
+
+var ErrNotImplementedError = errors.New("not implemented yet")
+
+// ReadFile reads contents from a file
+func ReadFile(filename string) (string, error) {
+	content, err := os.ReadFile(filename)
+	if err != nil {
+		return "", err
+	}
+
+	return string(content), nil
+}
+
+// ReadLines reads contents from a file and splits them by new lines.
+// A convenience wrapper to ReadLinesOffsetN(filename, 0, -1).
+func ReadLines(filename string) ([]string, error) {
+	return ReadLinesOffsetN(filename, 0, -1)
+}
+
+// ReadLines reads contents from file and splits them by new line.
+// The offset tells at which line number to start.
+// The count determines the number of lines to read (starting from offset):
+//
+//	n >= 0: at most n lines
+//	n < 0: whole file
+func ReadLinesOffsetN(filename string, offset uint, n int) ([]string, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return []string{""}, err
+	}
+	defer func(f *os.File) {
+		err := f.Close()
+		if err != nil {
+			log.Fatalln(err)
+		}
+	}(f)
+
+	var ret []string
+
+	r := bufio.NewReader(f)
+	for i := 0; i < n+int(offset) || n < 0; i++ {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			break
+		}
+		if i < int(offset) {
+			continue
+		}
+		ret = append(ret, strings.Trim(line, "\n"))
+	}
+
+	return ret, nil
+}
+
+func IntToString(orig []int8) string {
+	ret := make([]byte, len(orig))
+	size := -1
+	for i, o := range orig {
+		if o == 0 {
+			size = i
+			break
+		}
+		ret[i] = byte(o)
+	}
+	if size == -1 {
+		size = len(orig)
+	}
+
+	return string(ret[0:size])
+}
+
+func UintToString(orig []uint8) string {
+	ret := make([]byte, len(orig))
+	size := -1
+	for i, o := range orig {
+		if o == 0 {
+			size = i
+			break
+		}
+		ret[i] = byte(o)
+	}
+	if size == -1 {
+		size = len(orig)
+	}
+
+	return string(ret[0:size])
+}
+
+func ByteToString(orig []byte) string {
+	n := -1
+	l := -1
+	for i, b := range orig {
+		// skip left side null
+		if l == -1 && b == 0 {
+			continue
+		}
+		if l == -1 {
+			l = i
+		}
+
+		if b == 0 {
+			break
+		}
+		n = i + 1
+	}
+	if n == -1 {
+		return string(orig)
+	}
+	return string(orig[l:n])
+}
+
+// ReadInts reads contents from single line file and returns them as []int32.
+func ReadInts(filename string) ([]int64, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return []int64{}, err
+	}
+	defer func(f *os.File) {
+		err := f.Close()
+		if err != nil {
+			log.Fatalln(err)
+		}
+	}(f)
+
+	var ret []int64
+
+	r := bufio.NewReader(f)
+
+	// The int files that this is concerned with should only be one liners.
+	line, err := r.ReadString('\n')
+	if err != nil {
+		return []int64{}, err
+	}
+
+	i, err := strconv.ParseInt(strings.Trim(line, "\n"), 10, 32)
+	if err != nil {
+		return []int64{}, err
+	}
+	ret = append(ret, i)
+
+	return ret, nil
+}
+
+// Parse Hex to uint32 without error
+func HexToUint32(hex string) uint32 {
+	vv, _ := strconv.ParseUint(hex, 16, 32)
+	return uint32(vv)
+}
+
+// Parse to int32 without error
+func mustParseInt32(val string) int32 {
+	vv, _ := strconv.ParseInt(val, 10, 32)
+	return int32(vv)
+}
+
+// Parse to uint64 without error
+func mustParseUint64(val string) uint64 {
+	vv, _ := strconv.ParseInt(val, 10, 64)
+	return uint64(vv)
+}
+
+// Parse to Float64 without error
+func mustParseFloat64(val string) float64 {
+	vv, _ := strconv.ParseFloat(val, 64)
+	return vv
+}
+
+// StringsHas checks the target string slice contains src or not
+func StringsHas(target []string, src string) bool {
+	for _, t := range target {
+		if strings.TrimSpace(t) == src {
+			return true
+		}
+	}
+	return false
+}
+
+// StringsContains checks the src in any string of the target string slice
+func StringsContains(target []string, src string) bool {
+	for _, t := range target {
+		if strings.Contains(t, src) {
+			return true
+		}
+	}
+	return false
+}
+
+// IntContains checks the src in any int of the target int slice.
+func IntContains(target []int, src int) bool {
+	for _, t := range target {
+		if src == t {
+			return true
+		}
+	}
+	return false
+}
+
+// get struct attributes.
+// This method is used only for debugging platform dependent code.
+func attributes(m interface{}) map[string]reflect.Type {
+	typ := reflect.TypeOf(m)
+	if typ.Kind() == reflect.Ptr {
+		typ = typ.Elem()
+	}
+
+	attrs := make(map[string]reflect.Type)
+	if typ.Kind() != reflect.Struct {
+		return nil
+	}
+
+	for i := 0; i < typ.NumField(); i++ {
+		p := typ.Field(i)
+		if !p.Anonymous {
+			attrs[p.Name] = p.Type
+		}
+	}
+
+	return attrs
+}
+
+func PathExists(filename string) bool {
+	if _, err := os.Stat(filename); err == nil {
+		return true
+	}
+	return false
+}
+
+// GetEnv retrieves the environment variable key. If it does not exist it returns the default.
+func GetEnv(key, dfault string, combineWith ...string) string {
+	value := os.Getenv(key)
+	if value == "" {
+		value = dfault
+	}
+
+	switch len(combineWith) {
+	case 0:
+		return value
+	case 1:
+		return filepath.Join(value, combineWith[0])
+	default:
+		all := make([]string, len(combineWith)+1)
+		all[0] = value
+		copy(all[1:], combineWith)
+		return filepath.Join(all...)
+	}
+}
+
+func HostProc(combineWith ...string) string {
+	return GetEnv("HOST_PROC", "/proc", combineWith...)
+}
+
+func HostSys(combineWith ...string) string {
+	return GetEnv("HOST_SYS", "/sys", combineWith...)
+}
+
+func HostEtc(combineWith ...string) string {
+	return GetEnv("HOST_ETC", "/etc", combineWith...)
+}
+
+func HostVar(combineWith ...string) string {
+	return GetEnv("HOST_VAR", "/var", combineWith...)
+}
+
+func HostRun(combineWith ...string) string {
+	return GetEnv("HOST_RUN", "/run", combineWith...)
+}
+
+func HostDev(combineWith ...string) string {
+	return GetEnv("HOST_DEV", "/dev", combineWith...)
+}
+
+// getSysctrlEnv sets LC_ALL=C in a list of env vars for use when running
+// sysctl commands (see DoSysctrl).
+func getSysctrlEnv(env []string) []string {
+	foundLC := false
+	for i, line := range env {
+		if strings.HasPrefix(line, "LC_ALL") {
+			env[i] = "LC_ALL=C"
+			foundLC = true
+		}
+	}
+	if !foundLC {
+		env = append(env, "LC_ALL=C")
+	}
+	return env
+}

internal/gopsutil/common/common_darwin.go

@@ -0,0 +1,69 @@
+//go:build darwin
+
+package common
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func DoSysctrlWithContext(ctx context.Context, mib string) ([]string, error) {
+	sysctl, err := exec.LookPath("sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	cmd := exec.CommandContext(ctx, sysctl, "-n", mib)
+	cmd.Env = getSysctrlEnv(os.Environ())
+	out, err := cmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
+
+func CallSyscall(mib []int32) ([]byte, uint64, error) {
+	miblen := uint64(len(mib))
+
+	// get required buffer size
+	length := uint64(0)
+	_, _, err := unix.Syscall6(
+		202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(miblen),
+		0,
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		var b []byte
+		return b, length, err
+	}
+	if length == 0 {
+		var b []byte
+		return b, length, err
+	}
+	// get proc info itself
+	buf := make([]byte, length)
+	_, _, err = unix.Syscall6(
+		202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(miblen),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return buf, length, err
+	}
+
+	return buf, length, nil
+}

internal/gopsutil/common/common_freebsd.go

@@ -0,0 +1,85 @@
+//go:build freebsd || openbsd
+
+package common
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func SysctlUint(mib string) (uint64, error) {
+	buf, err := unix.SysctlRaw(mib)
+	if err != nil {
+		return 0, err
+	}
+	if len(buf) == 8 { // 64 bit
+		return *(*uint64)(unsafe.Pointer(&buf[0])), nil
+	}
+	if len(buf) == 4 { // 32bit
+		t := *(*uint32)(unsafe.Pointer(&buf[0]))
+		return uint64(t), nil
+	}
+	return 0, fmt.Errorf("unexpected size: %s, %d", mib, len(buf))
+}
+
+func DoSysctrl(mib string) ([]string, error) {
+	sysctl, err := exec.LookPath("sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	cmd := exec.Command(sysctl, "-n", mib)
+	cmd.Env = getSysctrlEnv(os.Environ())
+	out, err := cmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
+
+func CallSyscall(mib []int32) ([]byte, uint64, error) {
+	mibptr := unsafe.Pointer(&mib[0])
+	miblen := uint64(len(mib))
+
+	// get required buffer size
+	length := uint64(0)
+	_, _, err := unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		0,
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		var b []byte
+		return b, length, err
+	}
+	if length == 0 {
+		var b []byte
+		return b, length, err
+	}
+	// get proc info itself
+	buf := make([]byte, length)
+	_, _, err = unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return buf, length, err
+	}
+
+	return buf, length, nil
+}

internal/gopsutil/common/common_linux.go

@@ -0,0 +1,269 @@
+//go:build linux
+
+package common
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func DoSysctrl(mib string) ([]string, error) {
+	sysctl, err := exec.LookPath("sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	cmd := exec.Command(sysctl, "-n", mib)
+	cmd.Env = getSysctrlEnv(os.Environ())
+	out, err := cmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
+
+func NumProcs() (uint64, error) {
+	f, err := os.Open(HostProc())
+	if err != nil {
+		return 0, err
+	}
+	defer func(f *os.File) {
+		err := f.Close()
+		if err != nil {
+			log.Fatalln(err)
+		}
+	}(f)
+
+	list, err := f.Readdirnames(-1)
+	if err != nil {
+		return 0, err
+	}
+	var cnt uint64
+
+	for _, v := range list {
+		if _, err = strconv.ParseUint(v, 10, 64); err == nil {
+			cnt++
+		}
+	}
+
+	return cnt, nil
+}
+
+func BootTimeWithContext(ctx context.Context) (uint64, error) {
+	system, role, err := Virtualization()
+	if err != nil {
+		return 0, err
+	}
+
+	statFile := "stat"
+	if system == "lxc" && role == "guest" {
+		// if lxc, /proc/uptime is used.
+		statFile = "uptime"
+	} else if system == "docker" && role == "guest" {
+		// also docker, guest
+		statFile = "uptime"
+	}
+
+	filename := HostProc(statFile)
+	lines, err := ReadLines(filename)
+	if err != nil {
+		return 0, err
+	}
+
+	if statFile == "stat" {
+		for _, line := range lines {
+			if strings.HasPrefix(line, "btime") {
+				f := strings.Fields(line)
+				if len(f) != 2 {
+					return 0, fmt.Errorf("wrong btime format")
+				}
+				b, err := strconv.ParseInt(f[1], 10, 64)
+				if err != nil {
+					return 0, err
+				}
+				t := uint64(b)
+				return t, nil
+			}
+		}
+	} else if statFile == "uptime" {
+		if len(lines) != 1 {
+			return 0, fmt.Errorf("wrong uptime format")
+		}
+		f := strings.Fields(lines[0])
+		b, err := strconv.ParseFloat(f[0], 64)
+		if err != nil {
+			return 0, err
+		}
+		t := uint64(time.Now().Unix()) - uint64(b)
+		return t, nil
+	}
+
+	return 0, fmt.Errorf("could not find btime")
+}
+
+func Virtualization() (string, string, error) {
+	return VirtualizationWithContext(context.Background())
+}
+
+func VirtualizationWithContext(ctx context.Context) (string, string, error) {
+	var system string
+	var role string
+
+	filename := HostProc("xen")
+	if PathExists(filename) {
+		system = "xen"
+		role = "guest" // assume guest
+
+		if PathExists(filepath.Join(filename, "capabilities")) {
+			contents, err := ReadLines(filepath.Join(filename, "capabilities"))
+			if err == nil {
+				if StringsContains(contents, "control_d") {
+					role = "host"
+				}
+			}
+		}
+	}
+
+	filename = HostProc("modules")
+	if PathExists(filename) {
+		contents, err := ReadLines(filename)
+		if err == nil {
+			if StringsContains(contents, "kvm") {
+				system = "kvm"
+				role = "host"
+			} else if StringsContains(contents, "vboxdrv") {
+				system = "vbox"
+				role = "host"
+			} else if StringsContains(contents, "vboxguest") {
+				system = "vbox"
+				role = "guest"
+			} else if StringsContains(contents, "vmware") {
+				system = "vmware"
+				role = "guest"
+			}
+		}
+	}
+
+	filename = HostProc("cpuinfo")
+	if PathExists(filename) {
+		contents, err := ReadLines(filename)
+		if err == nil {
+			if StringsContains(contents, "QEMU Virtual CPU") ||
+				StringsContains(contents, "Common KVM processor") ||
+				StringsContains(contents, "Common 32-bit KVM processor") {
+				system = "kvm"
+				role = "guest"
+			}
+		}
+	}
+
+	filename = HostProc("bus/pci/devices")
+	if PathExists(filename) {
+		contents, err := ReadLines(filename)
+		if err == nil {
+			if StringsContains(contents, "virtio-pci") {
+				role = "guest"
+			}
+		}
+	}
+
+	filename = HostProc()
+	if PathExists(filepath.Join(filename, "bc", "0")) {
+		system = "openvz"
+		role = "host"
+	} else if PathExists(filepath.Join(filename, "vz")) {
+		system = "openvz"
+		role = "guest"
+	}
+
+	// not use dmidecode because it requires root
+	if PathExists(filepath.Join(filename, "self", "status")) {
+		contents, err := ReadLines(filepath.Join(filename, "self", "status"))
+		if err == nil {
+			if StringsContains(contents, "s_context:") ||
+				StringsContains(contents, "VxID:") {
+				system = "linux-vserver"
+			}
+			// TODO: guest or host
+		}
+	}
+
+	if PathExists(filepath.Join(filename, "1", "environ")) {
+		contents, err := ReadFile(filepath.Join(filename, "1", "environ"))
+
+		if err == nil {
+			if strings.Contains(contents, "container=lxc") {
+				system = "lxc"
+				role = "guest"
+			}
+		}
+	}
+
+	if PathExists(filepath.Join(filename, "self", "cgroup")) {
+		contents, err := ReadLines(filepath.Join(filename, "self", "cgroup"))
+		if err == nil {
+			if StringsContains(contents, "lxc") {
+				system = "lxc"
+				role = "guest"
+			} else if StringsContains(contents, "docker") {
+				system = "docker"
+				role = "guest"
+			} else if StringsContains(contents, "machine-rkt") {
+				system = "rkt"
+				role = "guest"
+			} else if PathExists("/usr/bin/lxc-version") {
+				system = "lxc"
+				role = "host"
+			}
+		}
+	}
+
+	if PathExists(HostEtc("os-release")) {
+		p, _, err := GetOSRelease()
+		if err == nil && p == "coreos" {
+			system = "rkt" // Is it true?
+			role = "host"
+		}
+	}
+	return system, role, nil
+}
+
+func GetOSRelease() (platform, version string, err error) {
+	contents, err := ReadLines(HostEtc("os-release"))
+	if err != nil {
+		return "", "", nil // return empty
+	}
+	for _, line := range contents {
+		field := strings.Split(line, "=")
+		if len(field) < 2 {
+			continue
+		}
+		switch field[0] {
+		case "ID": // use ID for lowercase
+			platform = trimQuotes(field[1])
+		case "VERSION":
+			version = trimQuotes(field[1])
+		}
+	}
+	return platform, version, nil
+}
+
+// Remove quotes of the source string
+func trimQuotes(s string) string {
+	if len(s) >= 2 {
+		if s[0] == '"' && s[len(s)-1] == '"' {
+			return s[1 : len(s)-1]
+		}
+	}
+	return s
+}

internal/gopsutil/common/common_openbsd.go

@@ -0,0 +1,69 @@
+//go:build openbsd
+
+package common
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func DoSysctrl(mib string) ([]string, error) {
+	sysctl, err := exec.LookPath("sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	cmd := exec.Command(sysctl, "-n", mib)
+	cmd.Env = getSysctrlEnv(os.Environ())
+	out, err := cmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
+
+func CallSyscall(mib []int32) ([]byte, uint64, error) {
+	mibptr := unsafe.Pointer(&mib[0])
+	miblen := uint64(len(mib))
+
+	// get required buffer size
+	length := uint64(0)
+	_, _, err := unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		0,
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		var b []byte
+		return b, length, err
+	}
+	if length == 0 {
+		var b []byte
+		return b, length, err
+	}
+	// get proc info itself
+	buf := make([]byte, length)
+	_, _, err = unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return buf, length, err
+	}
+
+	return buf, length, nil
+}

internal/gopsutil/common/common_unix.go

@@ -0,0 +1,66 @@
+//go:build linux || freebsd || darwin || openbsd
+
+package common
+
+import (
+	"context"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+func CallLsofWithContext(ctx context.Context, invoke Invoker, pid int32, args ...string) ([]string, error) {
+	var cmd []string
+	if pid == 0 { // will get from all processes.
+		cmd = []string{"-a", "-n", "-P"}
+	} else {
+		cmd = []string{"-a", "-n", "-P", "-p", strconv.Itoa(int(pid))}
+	}
+	cmd = append(cmd, args...)
+	lsof, err := exec.LookPath("lsof")
+	if err != nil {
+		return []string{}, err
+	}
+	out, err := invoke.CommandWithContext(ctx, lsof, cmd...)
+	if err != nil {
+		// if no pid found, lsof returns code 1.
+		if err.Error() == "exit status 1" && len(out) == 0 {
+			return []string{}, nil
+		}
+	}
+	lines := strings.Split(string(out), "\n")
+
+	var ret []string
+	for _, l := range lines[1:] {
+		if len(l) == 0 {
+			continue
+		}
+		ret = append(ret, l)
+	}
+	return ret, nil
+}
+
+func CallPgrepWithContext(ctx context.Context, invoke Invoker, pid int32) ([]int32, error) {
+	cmd := []string{"-P", strconv.Itoa(int(pid))}
+	pgrep, err := exec.LookPath("pgrep")
+	if err != nil {
+		return []int32{}, err
+	}
+	out, err := invoke.CommandWithContext(ctx, pgrep, cmd...)
+	if err != nil {
+		return []int32{}, err
+	}
+	lines := strings.Split(string(out), "\n")
+	ret := make([]int32, 0, len(lines))
+	for _, l := range lines {
+		if len(l) == 0 {
+			continue
+		}
+		i, err := strconv.Atoi(l)
+		if err != nil {
+			continue
+		}
+		ret = append(ret, int32(i))
+	}
+	return ret, nil
+}

internal/gopsutil/common/common_windows.go

@@ -0,0 +1,234 @@
+//go:build windows
+
+package common
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/gofiber/fiber/v2/internal/wmi"
+)
+
+// for double values
+type PDH_FMT_COUNTERVALUE_DOUBLE struct {
+	CStatus     uint32
+	DoubleValue float64
+}
+
+// for 64 bit integer values
+type PDH_FMT_COUNTERVALUE_LARGE struct {
+	CStatus    uint32
+	LargeValue int64
+}
+
+// for long values
+type PDH_FMT_COUNTERVALUE_LONG struct {
+	CStatus   uint32
+	LongValue int32
+	padding   [4]byte
+}
+
+// windows system const
+const (
+	ERROR_SUCCESS        = 0
+	ERROR_FILE_NOT_FOUND = 2
+	DRIVE_REMOVABLE      = 2
+	DRIVE_FIXED          = 3
+	HKEY_LOCAL_MACHINE   = 0x80000002
+	RRF_RT_REG_SZ        = 0x00000002
+	RRF_RT_REG_DWORD     = 0x00000010
+	PDH_FMT_LONG         = 0x00000100
+	PDH_FMT_DOUBLE       = 0x00000200
+	PDH_FMT_LARGE        = 0x00000400
+	PDH_INVALID_DATA     = 0xc0000bc6
+	PDH_INVALID_HANDLE   = 0xC0000bbc
+	PDH_NO_DATA          = 0x800007d5
+)
+
+const (
+	ProcessBasicInformation = 0
+	ProcessWow64Information = 26
+)
+
+var (
+	Modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
+	ModNt       = windows.NewLazySystemDLL("ntdll.dll")
+	ModPdh      = windows.NewLazySystemDLL("pdh.dll")
+	ModPsapi    = windows.NewLazySystemDLL("psapi.dll")
+
+	ProcGetSystemTimes                   = Modkernel32.NewProc("GetSystemTimes")
+	ProcNtQuerySystemInformation         = ModNt.NewProc("NtQuerySystemInformation")
+	ProcRtlGetNativeSystemInformation    = ModNt.NewProc("RtlGetNativeSystemInformation")
+	ProcRtlNtStatusToDosError            = ModNt.NewProc("RtlNtStatusToDosError")
+	ProcNtQueryInformationProcess        = ModNt.NewProc("NtQueryInformationProcess")
+	ProcNtReadVirtualMemory              = ModNt.NewProc("NtReadVirtualMemory")
+	ProcNtWow64QueryInformationProcess64 = ModNt.NewProc("NtWow64QueryInformationProcess64")
+	ProcNtWow64ReadVirtualMemory64       = ModNt.NewProc("NtWow64ReadVirtualMemory64")
+
+	PdhOpenQuery                = ModPdh.NewProc("PdhOpenQuery")
+	PdhAddEnglishCounterW       = ModPdh.NewProc("PdhAddEnglishCounterW")
+	PdhAddCounter               = ModPdh.NewProc("PdhAddCounterW")
+	PdhCollectQueryData         = ModPdh.NewProc("PdhCollectQueryData")
+	PdhGetFormattedCounterValue = ModPdh.NewProc("PdhGetFormattedCounterValue")
+	PdhCloseQuery               = ModPdh.NewProc("PdhCloseQuery")
+
+	procQueryDosDeviceW = Modkernel32.NewProc("QueryDosDeviceW")
+)
+
+type FILETIME struct {
+	DwLowDateTime  uint32
+	DwHighDateTime uint32
+}
+
+// borrowed from net/interface_windows.go
+func BytePtrToString(p *uint8) string {
+	a := (*[10000]uint8)(unsafe.Pointer(p))
+	i := 0
+	for a[i] != 0 {
+		i++
+	}
+	return string(a[:i])
+}
+
+// CounterInfo
+// copied from https://github.com/mackerelio/mackerel-agent/
+type CounterInfo struct {
+	PostName    string
+	CounterName string
+	Counter     windows.Handle
+}
+
+// CreateQuery XXX
+// copied from https://github.com/mackerelio/mackerel-agent/
+func CreateQuery() (windows.Handle, error) {
+	var query windows.Handle
+	r, _, err := PdhOpenQuery.Call(0, 0, uintptr(unsafe.Pointer(&query)))
+	if r != 0 {
+		return 0, err
+	}
+	return query, nil
+}
+
+// CreateCounter XXX
+func CreateCounter(query windows.Handle, pname, cname string) (*CounterInfo, error) {
+	var counter windows.Handle
+	r, _, err := PdhAddCounter.Call(
+		uintptr(query),
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(cname))),
+		0,
+		uintptr(unsafe.Pointer(&counter)))
+	if r != 0 {
+		return nil, err
+	}
+	return &CounterInfo{
+		PostName:    pname,
+		CounterName: cname,
+		Counter:     counter,
+	}, nil
+}
+
+// GetCounterValue get counter value from handle
+// adapted from https://github.com/mackerelio/mackerel-agent/
+func GetCounterValue(counter windows.Handle) (float64, error) {
+	var value PDH_FMT_COUNTERVALUE_DOUBLE
+	r, _, err := PdhGetFormattedCounterValue.Call(uintptr(counter), PDH_FMT_DOUBLE, uintptr(0), uintptr(unsafe.Pointer(&value)))
+	if r != 0 && r != PDH_INVALID_DATA {
+		return 0.0, err
+	}
+	return value.DoubleValue, nil
+}
+
+type Win32PerformanceCounter struct {
+	PostName    string
+	CounterName string
+	Query       windows.Handle
+	Counter     windows.Handle
+}
+
+func NewWin32PerformanceCounter(postName, counterName string) (*Win32PerformanceCounter, error) {
+	query, err := CreateQuery()
+	if err != nil {
+		return nil, err
+	}
+	counter := Win32PerformanceCounter{
+		Query:       query,
+		PostName:    postName,
+		CounterName: counterName,
+	}
+	r, _, err := PdhAddEnglishCounterW.Call(
+		uintptr(counter.Query),
+		uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(counter.CounterName))),
+		0,
+		uintptr(unsafe.Pointer(&counter.Counter)),
+	)
+	if r != 0 {
+		return nil, err
+	}
+	return &counter, nil
+}
+
+func (w *Win32PerformanceCounter) GetValue() (float64, error) {
+	r, _, err := PdhCollectQueryData.Call(uintptr(w.Query))
+	if r != 0 && err != nil {
+		if r == PDH_NO_DATA {
+			return 0.0, fmt.Errorf("%w: this counter has not data", err)
+		}
+		return 0.0, err
+	}
+
+	return GetCounterValue(w.Counter)
+}
+
+func ProcessorQueueLengthCounter() (*Win32PerformanceCounter, error) {
+	return NewWin32PerformanceCounter("processor_queue_length", `\System\Processor Queue Length`)
+}
+
+// WMIQueryWithContext - wraps wmi.Query with a timed-out context to avoid hanging
+func WMIQueryWithContext(ctx context.Context, query string, dst interface{}, connectServerArgs ...interface{}) error {
+	if _, ok := ctx.Deadline(); !ok {
+		ctxTimeout, cancel := context.WithTimeout(ctx, Timeout)
+		defer cancel()
+		ctx = ctxTimeout
+	}
+
+	errChan := make(chan error, 1)
+	go func() {
+		errChan <- wmi.Query(query, dst, connectServerArgs...)
+	}()
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case err := <-errChan:
+		return err
+	}
+}
+
+// Convert paths using native DOS format like:
+//
+//	"\Device\HarddiskVolume1\Windows\systemew\file.txt"
+//
+// into:
+//
+//	"C:\Windows\systemew\file.txt"
+func ConvertDOSPath(p string) string {
+	rawDrive := strings.Join(strings.Split(p, `\`)[:3], `\`)
+
+	for d := 'A'; d <= 'Z'; d++ {
+		szDeviceName := string(d) + ":"
+		szTarget := make([]uint16, 512)
+		ret, _, _ := procQueryDosDeviceW.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(szDeviceName))),
+			uintptr(unsafe.Pointer(&szTarget[0])),
+			uintptr(len(szTarget)))
+		if ret != 0 && windows.UTF16ToString(szTarget[:]) == rawDrive {
+			return filepath.Join(szDeviceName, p[len(rawDrive):])
+		}
+	}
+	return p
+}

internal/gopsutil/common/sleep.go

@@ -0,0 +1,21 @@
+package common
+
+import (
+	"context"
+	"time"
+)
+
+// Sleep awaits for provided interval.
+// Can be interrupted by context cancelation.
+func Sleep(ctx context.Context, interval time.Duration) error {
+	timer := time.NewTimer(interval)
+	select {
+	case <-ctx.Done():
+		if !timer.Stop() {
+			<-timer.C
+		}
+		return ctx.Err()
+	case <-timer.C:
+		return nil
+	}
+}

internal/gopsutil/cpu/cpu.go

@@ -0,0 +1,187 @@
+package cpu
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+// TimesStat contains the amounts of time the CPU has spent performing different
+// kinds of work. Time units are in seconds. It is based on linux /proc/stat file.
+type TimesStat struct {
+	CPU       string  `json:"cpu"`
+	User      float64 `json:"user"`
+	System    float64 `json:"system"`
+	Idle      float64 `json:"idle"`
+	Nice      float64 `json:"nice"`
+	Iowait    float64 `json:"iowait"`
+	Irq       float64 `json:"irq"`
+	Softirq   float64 `json:"softirq"`
+	Steal     float64 `json:"steal"`
+	Guest     float64 `json:"guest"`
+	GuestNice float64 `json:"guestNice"`
+}
+
+type InfoStat struct {
+	CPU        int32    `json:"cpu"`
+	VendorID   string   `json:"vendorId"`
+	Family     string   `json:"family"`
+	Model      string   `json:"model"`
+	Stepping   int32    `json:"stepping"`
+	PhysicalID string   `json:"physicalId"`
+	CoreID     string   `json:"coreId"`
+	Cores      int32    `json:"cores"`
+	ModelName  string   `json:"modelName"`
+	Mhz        float64  `json:"mhz"`
+	CacheSize  int32    `json:"cacheSize"`
+	Flags      []string `json:"flags"`
+	Microcode  string   `json:"microcode"`
+}
+
+type lastPercent struct {
+	sync.Mutex
+	lastCPUTimes    []TimesStat
+	lastPerCPUTimes []TimesStat
+}
+
+var (
+	lastCPUPercent lastPercent
+	invoke         common.Invoker = common.Invoke{}
+)
+
+func init() {
+	lastCPUPercent.Lock()
+	lastCPUPercent.lastCPUTimes, _ = Times(false)
+	lastCPUPercent.lastPerCPUTimes, _ = Times(true)
+	lastCPUPercent.Unlock()
+}
+
+// Counts returns the number of physical or logical cores in the system
+func Counts(logical bool) (int, error) {
+	return CountsWithContext(context.Background(), logical)
+}
+
+func (c TimesStat) String() string {
+	v := []string{
+		`"cpu":"` + c.CPU + `"`,
+		`"user":` + strconv.FormatFloat(c.User, 'f', 1, 64),
+		`"system":` + strconv.FormatFloat(c.System, 'f', 1, 64),
+		`"idle":` + strconv.FormatFloat(c.Idle, 'f', 1, 64),
+		`"nice":` + strconv.FormatFloat(c.Nice, 'f', 1, 64),
+		`"iowait":` + strconv.FormatFloat(c.Iowait, 'f', 1, 64),
+		`"irq":` + strconv.FormatFloat(c.Irq, 'f', 1, 64),
+		`"softirq":` + strconv.FormatFloat(c.Softirq, 'f', 1, 64),
+		`"steal":` + strconv.FormatFloat(c.Steal, 'f', 1, 64),
+		`"guest":` + strconv.FormatFloat(c.Guest, 'f', 1, 64),
+		`"guestNice":` + strconv.FormatFloat(c.GuestNice, 'f', 1, 64),
+	}
+
+	return `{` + strings.Join(v, ",") + `}`
+}
+
+// Total returns the total number of seconds in a CPUTimesStat
+func (c TimesStat) Total() float64 {
+	total := c.User + c.System + c.Nice + c.Iowait + c.Irq + c.Softirq +
+		c.Steal + c.Idle
+	return total
+}
+
+func (c InfoStat) String() string {
+	s, _ := json.Marshal(c)
+	return string(s)
+}
+
+func getAllBusy(t TimesStat) (float64, float64) {
+	busy := t.User + t.System + t.Nice + t.Iowait + t.Irq +
+		t.Softirq + t.Steal
+	return busy + t.Idle, busy
+}
+
+func calculateBusy(t1, t2 TimesStat) float64 {
+	t1All, t1Busy := getAllBusy(t1)
+	t2All, t2Busy := getAllBusy(t2)
+
+	if t2Busy <= t1Busy {
+		return 0
+	}
+	if t2All <= t1All {
+		return 100
+	}
+	return math.Min(100, math.Max(0, (t2Busy-t1Busy)/(t2All-t1All)*100))
+}
+
+func calculateAllBusy(t1, t2 []TimesStat) ([]float64, error) {
+	// Make sure the CPU measurements have the same length.
+	if len(t1) != len(t2) {
+		return nil, fmt.Errorf(
+			"received two CPU counts: %d != %d",
+			len(t1), len(t2),
+		)
+	}
+
+	ret := make([]float64, len(t1))
+	for i, t := range t2 {
+		ret[i] = calculateBusy(t1[i], t)
+	}
+	return ret, nil
+}
+
+// Percent calculates the percentage of cpu used either per CPU or combined.
+// If an interval of 0 is given it will compare the current cpu times against the last call.
+// Returns one value per cpu, or a single value if percpu is set to false.
+func Percent(interval time.Duration, percpu bool) ([]float64, error) {
+	return PercentWithContext(context.Background(), interval, percpu)
+}
+
+func PercentWithContext(ctx context.Context, interval time.Duration, percpu bool) ([]float64, error) {
+	if interval <= 0 {
+		return percentUsedFromLastCall(percpu)
+	}
+
+	// Get CPU usage at the start of the interval.
+	cpuTimes1, err := Times(percpu)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := common.Sleep(ctx, interval); err != nil {
+		return nil, err
+	}
+
+	// And at the end of the interval.
+	cpuTimes2, err := Times(percpu)
+	if err != nil {
+		return nil, err
+	}
+
+	return calculateAllBusy(cpuTimes1, cpuTimes2)
+}
+
+func percentUsedFromLastCall(percpu bool) ([]float64, error) {
+	cpuTimes, err := Times(percpu)
+	if err != nil {
+		return nil, err
+	}
+	lastCPUPercent.Lock()
+	defer lastCPUPercent.Unlock()
+	var lastTimes []TimesStat
+	if percpu {
+		lastTimes = lastCPUPercent.lastPerCPUTimes
+		lastCPUPercent.lastPerCPUTimes = cpuTimes
+	} else {
+		lastTimes = lastCPUPercent.lastCPUTimes
+		lastCPUPercent.lastCPUTimes = cpuTimes
+	}
+
+	if lastTimes == nil {
+		return nil, fmt.Errorf("error getting times for cpu percent. lastTimes was nil")
+	}
+	return calculateAllBusy(lastTimes, cpuTimes)
+}

internal/gopsutil/cpu/cpu_darwin.go

@@ -0,0 +1,119 @@
+//go:build darwin
+
+package cpu
+
+import (
+	"context"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+// sys/resource.h
+const (
+	CPUser    = 0
+	CPNice    = 1
+	CPSys     = 2
+	CPIntr    = 3
+	CPIdle    = 4
+	CPUStates = 5
+)
+
+// default value. from time.h
+var ClocksPerSec = float64(128)
+
+func init() {
+	getconf, err := exec.LookPath("getconf")
+	if err != nil {
+		return
+	}
+	out, err := invoke.Command(getconf, "CLK_TCK")
+	// ignore errors
+	if err == nil {
+		i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+		if err == nil {
+			ClocksPerSec = float64(i)
+		}
+	}
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	if percpu {
+		return perCPUTimes()
+	}
+
+	return allCPUTimes()
+}
+
+// Returns only one CPUInfoStat on FreeBSD
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	var ret []InfoStat
+
+	c := InfoStat{}
+	c.ModelName, _ = unix.Sysctl("machdep.cpu.brand_string")
+	family, _ := unix.SysctlUint32("machdep.cpu.family")
+	c.Family = strconv.FormatUint(uint64(family), 10)
+	model, _ := unix.SysctlUint32("machdep.cpu.model")
+	c.Model = strconv.FormatUint(uint64(model), 10)
+	stepping, _ := unix.SysctlUint32("machdep.cpu.stepping")
+	c.Stepping = int32(stepping)
+	features, err := unix.Sysctl("machdep.cpu.features")
+	if err == nil {
+		for _, v := range strings.Fields(features) {
+			c.Flags = append(c.Flags, strings.ToLower(v))
+		}
+	}
+	leaf7Features, err := unix.Sysctl("machdep.cpu.leaf7_features")
+	if err == nil {
+		for _, v := range strings.Fields(leaf7Features) {
+			c.Flags = append(c.Flags, strings.ToLower(v))
+		}
+	}
+	extfeatures, err := unix.Sysctl("machdep.cpu.extfeatures")
+	if err == nil {
+		for _, v := range strings.Fields(extfeatures) {
+			c.Flags = append(c.Flags, strings.ToLower(v))
+		}
+	}
+	cores, _ := unix.SysctlUint32("machdep.cpu.core_count")
+	c.Cores = int32(cores)
+	cacheSize, _ := unix.SysctlUint32("machdep.cpu.cache.size")
+	c.CacheSize = int32(cacheSize)
+	c.VendorID, _ = unix.Sysctl("machdep.cpu.vendor")
+
+	// Use the rated frequency of the CPU. This is a static value and does not
+	// account for low power or Turbo Boost modes.
+	cpuFrequency, err := unix.SysctlUint64("hw.cpufrequency")
+	if err != nil {
+		return ret, err
+	}
+	c.Mhz = float64(cpuFrequency) / 1000000.0
+
+	return append(ret, c), nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	var cpuArgument string
+	if logical {
+		cpuArgument = "hw.logicalcpu"
+	} else {
+		cpuArgument = "hw.physicalcpu"
+	}
+
+	count, err := unix.SysctlUint32(cpuArgument)
+	if err != nil {
+		return 0, err
+	}
+
+	return int(count), nil
+}

internal/gopsutil/cpu/cpu_darwin_cgo.go

@@ -0,0 +1,110 @@
+//go:build darwin && cgo
+
+package cpu
+
+/*
+#include <stdlib.h>
+#include <sys/sysctl.h>
+#include <sys/mount.h>
+#include <mach/mach_init.h>
+#include <mach/mach_host.h>
+#include <mach/host_info.h>
+#include <TargetConditionals.h>
+#if TARGET_OS_MAC
+#include <libproc.h>
+#endif
+#include <mach/processor_info.h>
+#include <mach/vm_map.h>
+*/
+import "C"
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"unsafe"
+)
+
+// these CPU times for darwin is borrowed from influxdb/telegraf.
+
+func perCPUTimes() ([]TimesStat, error) {
+	var (
+		count   C.mach_msg_type_number_t
+		cpuload *C.processor_cpu_load_info_data_t
+		ncpu    C.natural_t
+	)
+
+	status := C.host_processor_info(C.host_t(C.mach_host_self()),
+		C.PROCESSOR_CPU_LOAD_INFO,
+		&ncpu,
+		(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return nil, fmt.Errorf("host_processor_info error=%d", status)
+	}
+
+	// jump through some cgo casting hoops and ensure we properly free
+	// the memory that cpuload points to
+	target := C.vm_map_t(C.mach_task_self_)
+	address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
+	defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))
+
+	// the body of struct processor_cpu_load_info
+	// aka processor_cpu_load_info_data_t
+	var cpu_ticks [C.CPU_STATE_MAX]uint32
+
+	// copy the cpuload array to a []byte buffer
+	// where we can binary.Read the data
+	size := int(ncpu) * binary.Size(cpu_ticks)
+	buf := (*[1 << 30]byte)(unsafe.Pointer(cpuload))[:size:size]
+
+	bbuf := bytes.NewBuffer(buf)
+
+	var ret []TimesStat
+
+	for i := 0; i < int(ncpu); i++ {
+		err := binary.Read(bbuf, binary.LittleEndian, &cpu_ticks)
+		if err != nil {
+			return nil, err
+		}
+
+		c := TimesStat{
+			CPU:    fmt.Sprintf("cpu%d", i),
+			User:   float64(cpu_ticks[C.CPU_STATE_USER]) / ClocksPerSec,
+			System: float64(cpu_ticks[C.CPU_STATE_SYSTEM]) / ClocksPerSec,
+			Nice:   float64(cpu_ticks[C.CPU_STATE_NICE]) / ClocksPerSec,
+			Idle:   float64(cpu_ticks[C.CPU_STATE_IDLE]) / ClocksPerSec,
+		}
+
+		ret = append(ret, c)
+	}
+
+	return ret, nil
+}
+
+func allCPUTimes() ([]TimesStat, error) {
+	var count C.mach_msg_type_number_t
+	var cpuload C.host_cpu_load_info_data_t
+
+	count = C.HOST_CPU_LOAD_INFO_COUNT
+
+	status := C.host_statistics(C.host_t(C.mach_host_self()),
+		C.HOST_CPU_LOAD_INFO,
+		C.host_info_t(unsafe.Pointer(&cpuload)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return nil, fmt.Errorf("host_statistics error=%d", status)
+	}
+
+	c := TimesStat{
+		CPU:    "cpu-total",
+		User:   float64(cpuload.cpu_ticks[C.CPU_STATE_USER]) / ClocksPerSec,
+		System: float64(cpuload.cpu_ticks[C.CPU_STATE_SYSTEM]) / ClocksPerSec,
+		Nice:   float64(cpuload.cpu_ticks[C.CPU_STATE_NICE]) / ClocksPerSec,
+		Idle:   float64(cpuload.cpu_ticks[C.CPU_STATE_IDLE]) / ClocksPerSec,
+	}
+
+	return []TimesStat{c}, nil
+}

internal/gopsutil/cpu/cpu_darwin_nocgo.go

@@ -0,0 +1,13 @@
+//go:build darwin && !cgo
+
+package cpu
+
+import "github.com/gofiber/fiber/v2/internal/gopsutil/common"
+
+func perCPUTimes() ([]TimesStat, error) {
+	return []TimesStat{}, common.ErrNotImplementedError
+}
+
+func allCPUTimes() ([]TimesStat, error) {
+	return []TimesStat{}, common.ErrNotImplementedError
+}

internal/gopsutil/cpu/cpu_dragonfly.go

@@ -0,0 +1,164 @@
+package cpu
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strconv"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	ClocksPerSec   = float64(128)
+	cpuMatch       = regexp.MustCompile(`^CPU:`)
+	originMatch    = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
+	featuresMatch  = regexp.MustCompile(`Features=.+<(.+)>`)
+	featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
+	cpuEnd         = regexp.MustCompile(`^Trying to mount root`)
+	cpuTimesSize   int
+	emptyTimes     cpuTimes
+)
+
+func init() {
+	getconf, err := exec.LookPath("getconf")
+	if err != nil {
+		return
+	}
+	out, err := invoke.Command(getconf, "CLK_TCK")
+	// ignore errors
+	if err == nil {
+		i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+		if err == nil {
+			ClocksPerSec = float64(i)
+		}
+	}
+}
+
+func timeStat(name string, t *cpuTimes) *TimesStat {
+	return &TimesStat{
+		User:   float64(t.User) / ClocksPerSec,
+		Nice:   float64(t.Nice) / ClocksPerSec,
+		System: float64(t.Sys) / ClocksPerSec,
+		Idle:   float64(t.Idle) / ClocksPerSec,
+		Irq:    float64(t.Intr) / ClocksPerSec,
+		CPU:    name,
+	}
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	if percpu {
+		buf, err := unix.SysctlRaw("kern.cp_times")
+		if err != nil {
+			return nil, err
+		}
+
+		// We can't do this in init due to the conflict with cpu.init()
+		if cpuTimesSize == 0 {
+			cpuTimesSize = int(reflect.TypeOf(cpuTimes{}).Size())
+		}
+
+		ncpus := len(buf) / cpuTimesSize
+		ret := make([]TimesStat, 0, ncpus)
+		for i := 0; i < ncpus; i++ {
+			times := (*cpuTimes)(unsafe.Pointer(&buf[i*cpuTimesSize]))
+			if *times == emptyTimes {
+				// CPU not present
+				continue
+			}
+			ret = append(ret, *timeStat(fmt.Sprintf("cpu%d", len(ret)), times))
+		}
+		return ret, nil
+	}
+
+	buf, err := unix.SysctlRaw("kern.cp_time")
+	if err != nil {
+		return nil, err
+	}
+
+	times := (*cpuTimes)(unsafe.Pointer(&buf[0]))
+	return []TimesStat{*timeStat("cpu-total", times)}, nil
+}
+
+// Returns only one InfoStat on DragonflyBSD.  The information regarding core
+// count, however is accurate and it is assumed that all InfoStat attributes
+// are the same across CPUs.
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	const dmesgBoot = "/var/run/dmesg.boot"
+
+	c, err := parseDmesgBoot(dmesgBoot)
+	if err != nil {
+		return nil, err
+	}
+
+	var u32 uint32
+	if u32, err = unix.SysctlUint32("hw.clockrate"); err != nil {
+		return nil, err
+	}
+	c.Mhz = float64(u32)
+
+	var num int
+	var buf string
+	if buf, err = unix.Sysctl("hw.cpu_topology.tree"); err != nil {
+		return nil, err
+	}
+	num = strings.Count(buf, "CHIP")
+	c.Cores = int32(strings.Count(string(buf), "CORE") / num)
+
+	if c.ModelName, err = unix.Sysctl("hw.model"); err != nil {
+		return nil, err
+	}
+
+	ret := make([]InfoStat, num)
+	for i := 0; i < num; i++ {
+		ret[i] = c
+	}
+
+	return ret, nil
+}
+
+func parseDmesgBoot(fileName string) (InfoStat, error) {
+	c := InfoStat{}
+	lines, _ := common.ReadLines(fileName)
+	for _, line := range lines {
+		if matches := cpuEnd.FindStringSubmatch(line); matches != nil {
+			break
+		} else if matches := originMatch.FindStringSubmatch(line); matches != nil {
+			c.VendorID = matches[1]
+			t, err := strconv.ParseInt(matches[2], 10, 32)
+			if err != nil {
+				return c, fmt.Errorf("unable to parse DragonflyBSD CPU stepping information from %q: %v", line, err)
+			}
+			c.Stepping = int32(t)
+		} else if matches := featuresMatch.FindStringSubmatch(line); matches != nil {
+			for _, v := range strings.Split(matches[1], ",") {
+				c.Flags = append(c.Flags, strings.ToLower(v))
+			}
+		} else if matches := featuresMatch2.FindStringSubmatch(line); matches != nil {
+			for _, v := range strings.Split(matches[1], ",") {
+				c.Flags = append(c.Flags, strings.ToLower(v))
+			}
+		}
+	}
+
+	return c, nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

internal/gopsutil/cpu/cpu_dragonfly_amd64.go

@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Intr uint64
+	Idle uint64
+}

internal/gopsutil/cpu/cpu_fallback.go

@@ -0,0 +1,30 @@
+//go:build !darwin && !linux && !freebsd && !openbsd && !solaris && !windows && !dragonfly
+
+package cpu
+
+import (
+	"context"
+	"runtime"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	return []TimesStat{}, common.ErrNotImplementedError
+}
+
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	return []InfoStat{}, common.ErrNotImplementedError
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

internal/gopsutil/cpu/cpu_freebsd.go

@@ -0,0 +1,176 @@
+package cpu
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strconv"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	ClocksPerSec   = float64(128)
+	cpuMatch       = regexp.MustCompile(`^CPU:`)
+	originMatch    = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Family\s*=\s*(.+)\s+Model\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
+	featuresMatch  = regexp.MustCompile(`Features=.+<(.+)>`)
+	featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
+	cpuEnd         = regexp.MustCompile(`^Trying to mount root`)
+	cpuCores       = regexp.MustCompile(`FreeBSD/SMP: (\d*) package\(s\) x (\d*) core\(s\)`)
+	cpuTimesSize   int
+	emptyTimes     cpuTimes
+)
+
+func init() {
+	getconf, err := exec.LookPath("getconf")
+	if err != nil {
+		return
+	}
+	out, err := invoke.Command(getconf, "CLK_TCK")
+	// ignore errors
+	if err == nil {
+		i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+		if err == nil {
+			ClocksPerSec = float64(i)
+		}
+	}
+}
+
+func timeStat(name string, t *cpuTimes) *TimesStat {
+	return &TimesStat{
+		User:   float64(t.User) / ClocksPerSec,
+		Nice:   float64(t.Nice) / ClocksPerSec,
+		System: float64(t.Sys) / ClocksPerSec,
+		Idle:   float64(t.Idle) / ClocksPerSec,
+		Irq:    float64(t.Intr) / ClocksPerSec,
+		CPU:    name,
+	}
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	if percpu {
+		buf, err := unix.SysctlRaw("kern.cp_times")
+		if err != nil {
+			return nil, err
+		}
+
+		// We can't do this in init due to the conflict with cpu.init()
+		if cpuTimesSize == 0 {
+			cpuTimesSize = int(reflect.TypeOf(cpuTimes{}).Size())
+		}
+
+		ncpus := len(buf) / cpuTimesSize
+		ret := make([]TimesStat, 0, ncpus)
+		for i := 0; i < ncpus; i++ {
+			times := (*cpuTimes)(unsafe.Pointer(&buf[i*cpuTimesSize]))
+			if *times == emptyTimes {
+				// CPU not present
+				continue
+			}
+			ret = append(ret, *timeStat(fmt.Sprintf("cpu%d", len(ret)), times))
+		}
+		return ret, nil
+	}
+
+	buf, err := unix.SysctlRaw("kern.cp_time")
+	if err != nil {
+		return nil, err
+	}
+
+	times := (*cpuTimes)(unsafe.Pointer(&buf[0]))
+	return []TimesStat{*timeStat("cpu-total", times)}, nil
+}
+
+// Returns only one InfoStat on FreeBSD.  The information regarding core
+// count, however is accurate and it is assumed that all InfoStat attributes
+// are the same across CPUs.
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	const dmesgBoot = "/var/run/dmesg.boot"
+
+	c, num, err := parseDmesgBoot(dmesgBoot)
+	if err != nil {
+		return nil, err
+	}
+
+	var u32 uint32
+	if u32, err = unix.SysctlUint32("hw.clockrate"); err != nil {
+		return nil, err
+	}
+	c.Mhz = float64(u32)
+
+	if u32, err = unix.SysctlUint32("hw.ncpu"); err != nil {
+		return nil, err
+	}
+	c.Cores = int32(u32)
+
+	if c.ModelName, err = unix.Sysctl("hw.model"); err != nil {
+		return nil, err
+	}
+
+	ret := make([]InfoStat, num)
+	for i := 0; i < num; i++ {
+		ret[i] = c
+	}
+
+	return ret, nil
+}
+
+func parseDmesgBoot(fileName string) (InfoStat, int, error) {
+	c := InfoStat{}
+	lines, _ := common.ReadLines(fileName)
+	cpuNum := 1 // default cpu num is 1
+	for _, line := range lines {
+		if matches := cpuEnd.FindStringSubmatch(line); matches != nil {
+			break
+		} else if matches := originMatch.FindStringSubmatch(line); matches != nil {
+			c.VendorID = matches[1]
+			c.Family = matches[3]
+			c.Model = matches[4]
+			t, err := strconv.ParseInt(matches[5], 10, 32)
+			if err != nil {
+				return c, 0, fmt.Errorf("unable to parse FreeBSD CPU stepping information from %q: %v", line, err)
+			}
+			c.Stepping = int32(t)
+		} else if matches := featuresMatch.FindStringSubmatch(line); matches != nil {
+			for _, v := range strings.Split(matches[1], ",") {
+				c.Flags = append(c.Flags, strings.ToLower(v))
+			}
+		} else if matches := featuresMatch2.FindStringSubmatch(line); matches != nil {
+			for _, v := range strings.Split(matches[1], ",") {
+				c.Flags = append(c.Flags, strings.ToLower(v))
+			}
+		} else if matches := cpuCores.FindStringSubmatch(line); matches != nil {
+			t, err := strconv.ParseInt(matches[1], 10, 32)
+			if err != nil {
+				return c, 0, fmt.Errorf("unable to parse FreeBSD CPU Nums from %q: %v", line, err)
+			}
+			cpuNum = int(t)
+			t2, err := strconv.ParseInt(matches[2], 10, 32)
+			if err != nil {
+				return c, 0, fmt.Errorf("unable to parse FreeBSD CPU cores from %q: %v", line, err)
+			}
+			c.Cores = int32(t2)
+		}
+	}
+
+	return c, cpuNum, nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

internal/gopsutil/cpu/cpu_freebsd_386.go

@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint32
+	Nice uint32
+	Sys  uint32
+	Intr uint32
+	Idle uint32
+}

internal/gopsutil/cpu/cpu_freebsd_amd64.go

@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Intr uint64
+	Idle uint64
+}

internal/gopsutil/cpu/cpu_freebsd_arm.go

@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint32
+	Nice uint32
+	Sys  uint32
+	Intr uint32
+	Idle uint32
+}

internal/gopsutil/cpu/cpu_freebsd_arm64.go

@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Intr uint64
+	Idle uint64
+}

internal/gopsutil/cpu/cpu_linux.go

@@ -0,0 +1,369 @@
+//go:build linux
+
+package cpu
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var ClocksPerSec = float64(100)
+
+func init() {
+	getconf, err := exec.LookPath("getconf")
+	if err != nil {
+		return
+	}
+	out, err := invoke.CommandWithContext(context.Background(), getconf, "CLK_TCK")
+	// ignore errors
+	if err == nil {
+		i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+		if err == nil {
+			ClocksPerSec = i
+		}
+	}
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	filename := common.HostProc("stat")
+	lines := []string{}
+	if percpu {
+		statlines, err := common.ReadLines(filename)
+		if err != nil || len(statlines) < 2 {
+			return []TimesStat{}, nil
+		}
+		for _, line := range statlines[1:] {
+			if !strings.HasPrefix(line, "cpu") {
+				break
+			}
+			lines = append(lines, line)
+		}
+	} else {
+		lines, _ = common.ReadLinesOffsetN(filename, 0, 1)
+	}
+
+	ret := make([]TimesStat, 0, len(lines))
+
+	for _, line := range lines {
+		ct, err := parseStatLine(line)
+		if err != nil {
+			continue
+		}
+		ret = append(ret, *ct)
+
+	}
+	return ret, nil
+}
+
+func sysCPUPath(cpu int32, relPath string) string {
+	return common.HostSys(fmt.Sprintf("devices/system/cpu/cpu%d", cpu), relPath)
+}
+
+func finishCPUInfo(c *InfoStat) error {
+	var lines []string
+	var err error
+	var value float64
+
+	if len(c.CoreID) == 0 {
+		lines, err = common.ReadLines(sysCPUPath(c.CPU, "topology/core_id"))
+		if err == nil {
+			c.CoreID = lines[0]
+		}
+	}
+
+	// override the value of c.Mhz with cpufreq/cpuinfo_max_freq regardless
+	// of the value from /proc/cpuinfo because we want to report the maximum
+	// clock-speed of the CPU for c.Mhz, matching the behaviour of Windows
+	lines, err = common.ReadLines(sysCPUPath(c.CPU, "cpufreq/cpuinfo_max_freq"))
+	// if we encounter errors below such as there are no cpuinfo_max_freq file,
+	// we just ignore. so let Mhz is 0.
+	if err != nil || len(lines) == 0 {
+		return nil
+	}
+	value, err = strconv.ParseFloat(lines[0], 64)
+	if err != nil {
+		return nil
+	}
+	c.Mhz = value / 1000.0 // value is in kHz
+	if c.Mhz > 9999 {
+		c.Mhz = c.Mhz / 1000.0 // value in Hz
+	}
+	return nil
+}
+
+// CPUInfo on linux will return 1 item per physical thread.
+//
+// CPUs have three levels of counting: sockets, cores, threads.
+// Cores with HyperThreading count as having 2 threads per core.
+// Sockets often come with many physical CPU cores.
+// For example a single socket board with two cores each with HT will
+// return 4 CPUInfoStat structs on Linux and the "Cores" field set to 1.
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	filename := common.HostProc("cpuinfo")
+	lines, _ := common.ReadLines(filename)
+
+	var ret []InfoStat
+	var processorName string
+
+	c := InfoStat{CPU: -1, Cores: 1}
+	for _, line := range lines {
+		fields := strings.Split(line, ":")
+		if len(fields) < 2 {
+			continue
+		}
+		key := strings.TrimSpace(fields[0])
+		value := strings.TrimSpace(fields[1])
+
+		switch key {
+		case "Processor":
+			processorName = value
+		case "processor":
+			if c.CPU >= 0 {
+				err := finishCPUInfo(&c)
+				if err != nil {
+					return ret, err
+				}
+				ret = append(ret, c)
+			}
+			c = InfoStat{Cores: 1, ModelName: processorName}
+			t, err := strconv.ParseInt(value, 10, 64)
+			if err != nil {
+				return ret, err
+			}
+			c.CPU = int32(t)
+		case "vendorId", "vendor_id":
+			c.VendorID = value
+		case "cpu family":
+			c.Family = value
+		case "model":
+			c.Model = value
+		case "model name", "cpu":
+			c.ModelName = value
+			if strings.Contains(value, "POWER8") ||
+				strings.Contains(value, "POWER7") {
+				c.Model = strings.Split(value, " ")[0]
+				c.Family = "POWER"
+				c.VendorID = "IBM"
+			}
+		case "stepping", "revision":
+			val := value
+
+			if key == "revision" {
+				val = strings.Split(value, ".")[0]
+			}
+
+			t, err := strconv.ParseInt(val, 10, 64)
+			if err != nil {
+				return ret, err
+			}
+			c.Stepping = int32(t)
+		case "cpu MHz", "clock":
+			// treat this as the fallback value, thus we ignore error
+			if t, err := strconv.ParseFloat(strings.Replace(value, "MHz", "", 1), 64); err == nil {
+				c.Mhz = t
+			}
+		case "cache size":
+			t, err := strconv.ParseInt(strings.Replace(value, " KB", "", 1), 10, 64)
+			if err != nil {
+				return ret, err
+			}
+			c.CacheSize = int32(t)
+		case "physical id":
+			c.PhysicalID = value
+		case "core id":
+			c.CoreID = value
+		case "flags", "Features":
+			c.Flags = strings.FieldsFunc(value, func(r rune) bool {
+				return r == ',' || r == ' '
+			})
+		case "microcode":
+			c.Microcode = value
+		}
+	}
+	if c.CPU >= 0 {
+		err := finishCPUInfo(&c)
+		if err != nil {
+			return ret, err
+		}
+		ret = append(ret, c)
+	}
+	return ret, nil
+}
+
+func parseStatLine(line string) (*TimesStat, error) {
+	fields := strings.Fields(line)
+
+	if len(fields) == 0 {
+		return nil, errors.New("stat does not contain cpu info")
+	}
+
+	if !strings.HasPrefix(fields[0], "cpu") {
+		return nil, errors.New("not contain cpu")
+	}
+
+	cpu := fields[0]
+	if cpu == "cpu" {
+		cpu = "cpu-total"
+	}
+	user, err := strconv.ParseFloat(fields[1], 64)
+	if err != nil {
+		return nil, err
+	}
+	nice, err := strconv.ParseFloat(fields[2], 64)
+	if err != nil {
+		return nil, err
+	}
+	system, err := strconv.ParseFloat(fields[3], 64)
+	if err != nil {
+		return nil, err
+	}
+	idle, err := strconv.ParseFloat(fields[4], 64)
+	if err != nil {
+		return nil, err
+	}
+	iowait, err := strconv.ParseFloat(fields[5], 64)
+	if err != nil {
+		return nil, err
+	}
+	irq, err := strconv.ParseFloat(fields[6], 64)
+	if err != nil {
+		return nil, err
+	}
+	softirq, err := strconv.ParseFloat(fields[7], 64)
+	if err != nil {
+		return nil, err
+	}
+
+	ct := &TimesStat{
+		CPU:     cpu,
+		User:    user / ClocksPerSec,
+		Nice:    nice / ClocksPerSec,
+		System:  system / ClocksPerSec,
+		Idle:    idle / ClocksPerSec,
+		Iowait:  iowait / ClocksPerSec,
+		Irq:     irq / ClocksPerSec,
+		Softirq: softirq / ClocksPerSec,
+	}
+	if len(fields) > 8 { // Linux >= 2.6.11
+		steal, err := strconv.ParseFloat(fields[8], 64)
+		if err != nil {
+			return nil, err
+		}
+		ct.Steal = steal / ClocksPerSec
+	}
+	if len(fields) > 9 { // Linux >= 2.6.24
+		guest, err := strconv.ParseFloat(fields[9], 64)
+		if err != nil {
+			return nil, err
+		}
+		ct.Guest = guest / ClocksPerSec
+	}
+	if len(fields) > 10 { // Linux >= 3.2.0
+		guestNice, err := strconv.ParseFloat(fields[10], 64)
+		if err != nil {
+			return nil, err
+		}
+		ct.GuestNice = guestNice / ClocksPerSec
+	}
+
+	return ct, nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	if logical {
+		ret := 0
+		// https://github.com/giampaolo/psutil/blob/d01a9eaa35a8aadf6c519839e987a49d8be2d891/psutil/_pslinux.py#L599
+		procCpuinfo := common.HostProc("cpuinfo")
+		lines, err := common.ReadLines(procCpuinfo)
+		if err == nil {
+			for _, line := range lines {
+				line = strings.ToLower(line)
+				if strings.HasPrefix(line, "processor") {
+					ret++
+				}
+			}
+		}
+		if ret == 0 {
+			procStat := common.HostProc("stat")
+			lines, err = common.ReadLines(procStat)
+			if err != nil {
+				return 0, err
+			}
+			for _, line := range lines {
+				if len(line) >= 4 && strings.HasPrefix(line, "cpu") && '0' <= line[3] && line[3] <= '9' { // `^cpu\d` regexp matching
+					ret++
+				}
+			}
+		}
+		return ret, nil
+	}
+	// physical cores
+	// https://github.com/giampaolo/psutil/blob/122174a10b75c9beebe15f6c07dcf3afbe3b120d/psutil/_pslinux.py#L621-L629
+	threadSiblingsLists := make(map[string]bool)
+	if files, err := filepath.Glob(common.HostSys("devices/system/cpu/cpu[0-9]*/topology/thread_siblings_list")); err == nil {
+		for _, file := range files {
+			lines, err := common.ReadLines(file)
+			if err != nil || len(lines) != 1 {
+				continue
+			}
+			threadSiblingsLists[lines[0]] = true
+		}
+		ret := len(threadSiblingsLists)
+		if ret != 0 {
+			return ret, nil
+		}
+	}
+	// https://github.com/giampaolo/psutil/blob/122174a10b75c9beebe15f6c07dcf3afbe3b120d/psutil/_pslinux.py#L631-L652
+	filename := common.HostProc("cpuinfo")
+	lines, err := common.ReadLines(filename)
+	if err != nil {
+		return 0, err
+	}
+	mapping := make(map[int]int)
+	currentInfo := make(map[string]int)
+	for _, line := range lines {
+		line = strings.ToLower(strings.TrimSpace(line))
+		if line == "" {
+			// new section
+			id, okID := currentInfo["physical id"]
+			cores, okCores := currentInfo["cpu cores"]
+			if okID && okCores {
+				mapping[id] = cores
+			}
+			currentInfo = make(map[string]int)
+			continue
+		}
+		fields := strings.Split(line, ":")
+		if len(fields) < 2 {
+			continue
+		}
+		fields[0] = strings.TrimSpace(fields[0])
+		if fields[0] == "physical id" || fields[0] == "cpu cores" {
+			val, err := strconv.Atoi(strings.TrimSpace(fields[1]))
+			if err != nil {
+				continue
+			}
+			currentInfo[fields[0]] = val
+		}
+	}
+	ret := 0
+	for _, v := range mapping {
+		ret += v
+	}
+	return ret, nil
+}

internal/gopsutil/cpu/cpu_openbsd.go

@@ -0,0 +1,187 @@
+//go:build openbsd
+
+package cpu
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"fmt"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+// sys/sched.h
+var (
+	CPUser    = 0
+	CPNice    = 1
+	CPSys     = 2
+	CPIntr    = 3
+	CPIdle    = 4
+	CPUStates = 5
+)
+
+// sys/sysctl.h
+const (
+	CTLKern     = 1  // "high kernel": proc, limits
+	CTLHw       = 6  // CTL_HW
+	SMT         = 24 // HW_SMT
+	KernCptime  = 40 // KERN_CPTIME
+	KernCptime2 = 71 // KERN_CPTIME2
+)
+
+var ClocksPerSec = float64(128)
+
+func init() {
+	func() {
+		getconf, err := exec.LookPath("getconf")
+		if err != nil {
+			return
+		}
+		out, err := invoke.Command(getconf, "CLK_TCK")
+		// ignore errors
+		if err == nil {
+			i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+			if err == nil {
+				ClocksPerSec = float64(i)
+			}
+		}
+	}()
+	func() {
+		v, err := unix.Sysctl("kern.osrelease") // can't reuse host.PlatformInformation because of circular import
+		if err != nil {
+			return
+		}
+		v = strings.ToLower(v)
+		version, err := strconv.ParseFloat(v, 64)
+		if err != nil {
+			return
+		}
+		if version >= 6.4 {
+			CPIntr = 4
+			CPIdle = 5
+			CPUStates = 6
+		}
+	}()
+}
+
+func smt() (bool, error) {
+	mib := []int32{CTLHw, SMT}
+	buf, _, err := common.CallSyscall(mib)
+	if err != nil {
+		return false, err
+	}
+
+	var ret bool
+	br := bytes.NewReader(buf)
+	if err := binary.Read(br, binary.LittleEndian, &ret); err != nil {
+		return false, err
+	}
+
+	return ret, nil
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	var ret []TimesStat
+
+	var ncpu int
+	if percpu {
+		ncpu, _ = Counts(true)
+	} else {
+		ncpu = 1
+	}
+
+	smt, err := smt()
+	if err == syscall.EOPNOTSUPP {
+		// if hw.smt is not applicable for this platform (e.g. i386),
+		// pretend it's enabled
+		smt = true
+	} else if err != nil {
+		return nil, err
+	}
+
+	for i := 0; i < ncpu; i++ {
+		j := i
+		if !smt {
+			j *= 2
+		}
+
+		cpuTimes := make([]int32, CPUStates)
+		var mib []int32
+		if percpu {
+			mib = []int32{CTLKern, KernCptime2, int32(j)}
+		} else {
+			mib = []int32{CTLKern, KernCptime}
+		}
+		buf, _, err := common.CallSyscall(mib)
+		if err != nil {
+			return ret, err
+		}
+
+		br := bytes.NewReader(buf)
+		err = binary.Read(br, binary.LittleEndian, &cpuTimes)
+		if err != nil {
+			return ret, err
+		}
+		c := TimesStat{
+			User:   float64(cpuTimes[CPUser]) / ClocksPerSec,
+			Nice:   float64(cpuTimes[CPNice]) / ClocksPerSec,
+			System: float64(cpuTimes[CPSys]) / ClocksPerSec,
+			Idle:   float64(cpuTimes[CPIdle]) / ClocksPerSec,
+			Irq:    float64(cpuTimes[CPIntr]) / ClocksPerSec,
+		}
+		if percpu {
+			c.CPU = fmt.Sprintf("cpu%d", j)
+		} else {
+			c.CPU = "cpu-total"
+		}
+		ret = append(ret, c)
+	}
+
+	return ret, nil
+}
+
+// Returns only one (minimal) CPUInfoStat on OpenBSD
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	var ret []InfoStat
+	var err error
+
+	c := InfoStat{}
+
+	mhz, err := unix.SysctlUint32("hw.cpuspeed")
+	if err != nil {
+		return nil, err
+	}
+	c.Mhz = float64(mhz)
+
+	ncpu, err := unix.SysctlUint32("hw.ncpuonline")
+	if err != nil {
+		return nil, err
+	}
+	c.Cores = int32(ncpu)
+
+	if c.ModelName, err = unix.Sysctl("hw.model"); err != nil {
+		return nil, err
+	}
+
+	return append(ret, c), nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

internal/gopsutil/cpu/cpu_solaris.go

@@ -0,0 +1,286 @@
+package cpu
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+var ClocksPerSec = float64(128)
+
+func init() {
+	getconf, err := exec.LookPath("getconf")
+	if err != nil {
+		return
+	}
+	out, err := invoke.Command(getconf, "CLK_TCK")
+	// ignore errors
+	if err == nil {
+		i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
+		if err == nil {
+			ClocksPerSec = float64(i)
+		}
+	}
+}
+
+// sum all values in a float64 map with float64 keys
+func msum(x map[float64]float64) float64 {
+	total := 0.0
+	for _, y := range x {
+		total += y
+	}
+	return total
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	kstatSys, err := exec.LookPath("kstat")
+	if err != nil {
+		return nil, fmt.Errorf("cannot find kstat: %s", err)
+	}
+	cpu := make(map[float64]float64)
+	idle := make(map[float64]float64)
+	user := make(map[float64]float64)
+	kern := make(map[float64]float64)
+	iowt := make(map[float64]float64)
+	// swap := make(map[float64]float64)
+	kstatSysOut, err := invoke.CommandWithContext(ctx, kstatSys, "-p", "cpu_stat:*:*:/^idle$|^user$|^kernel$|^iowait$|^swap$/")
+	if err != nil {
+		return nil, fmt.Errorf("cannot execute kstat: %s", err)
+	}
+	re := regexp.MustCompile(`[:\s]+`)
+	for _, line := range strings.Split(string(kstatSysOut), "\n") {
+		fields := re.Split(line, -1)
+		if fields[0] != "cpu_stat" {
+			continue
+		}
+		cpuNumber, err := strconv.ParseFloat(fields[1], 64)
+		if err != nil {
+			return nil, fmt.Errorf("cannot parse cpu number: %s", err)
+		}
+		cpu[cpuNumber] = cpuNumber
+		switch fields[3] {
+		case "idle":
+			idle[cpuNumber], err = strconv.ParseFloat(fields[4], 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse idle: %s", err)
+			}
+		case "user":
+			user[cpuNumber], err = strconv.ParseFloat(fields[4], 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse user: %s", err)
+			}
+		case "kernel":
+			kern[cpuNumber], err = strconv.ParseFloat(fields[4], 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse kernel: %s", err)
+			}
+		case "iowait":
+			iowt[cpuNumber], err = strconv.ParseFloat(fields[4], 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse iowait: %s", err)
+			}
+			//not sure how this translates, don't report, add to kernel, something else?
+			/*case "swap":
+			swap[cpuNumber], err = strconv.ParseFloat(fields[4], 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse swap: %s", err)
+			} */
+		}
+	}
+	ret := make([]TimesStat, 0, len(cpu))
+	if percpu {
+		for _, c := range cpu {
+			ct := &TimesStat{
+				CPU:    fmt.Sprintf("cpu%d", int(cpu[c])),
+				Idle:   idle[c] / ClocksPerSec,
+				User:   user[c] / ClocksPerSec,
+				System: kern[c] / ClocksPerSec,
+				Iowait: iowt[c] / ClocksPerSec,
+			}
+			ret = append(ret, *ct)
+		}
+	} else {
+		ct := &TimesStat{
+			CPU:    "cpu-total",
+			Idle:   msum(idle) / ClocksPerSec,
+			User:   msum(user) / ClocksPerSec,
+			System: msum(kern) / ClocksPerSec,
+			Iowait: msum(iowt) / ClocksPerSec,
+		}
+		ret = append(ret, *ct)
+	}
+	return ret, nil
+}
+
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	psrInfo, err := exec.LookPath("psrinfo")
+	if err != nil {
+		return nil, fmt.Errorf("cannot find psrinfo: %s", err)
+	}
+	psrInfoOut, err := invoke.CommandWithContext(ctx, psrInfo, "-p", "-v")
+	if err != nil {
+		return nil, fmt.Errorf("cannot execute psrinfo: %s", err)
+	}
+
+	isaInfo, err := exec.LookPath("isainfo")
+	if err != nil {
+		return nil, fmt.Errorf("cannot find isainfo: %s", err)
+	}
+	isaInfoOut, err := invoke.CommandWithContext(ctx, isaInfo, "-b", "-v")
+	if err != nil {
+		return nil, fmt.Errorf("cannot execute isainfo: %s", err)
+	}
+
+	procs, err := parseProcessorInfo(string(psrInfoOut))
+	if err != nil {
+		return nil, fmt.Errorf("error parsing psrinfo output: %s", err)
+	}
+
+	flags, err := parseISAInfo(string(isaInfoOut))
+	if err != nil {
+		return nil, fmt.Errorf("error parsing isainfo output: %s", err)
+	}
+
+	result := make([]InfoStat, 0, len(flags))
+	for _, proc := range procs {
+		procWithFlags := proc
+		procWithFlags.Flags = flags
+		result = append(result, procWithFlags)
+	}
+
+	return result, nil
+}
+
+var flagsMatch = regexp.MustCompile(`[\w\.]+`)
+
+func parseISAInfo(cmdOutput string) ([]string, error) {
+	words := flagsMatch.FindAllString(cmdOutput, -1)
+
+	// Sanity check the output
+	if len(words) < 4 || words[1] != "bit" || words[3] != "applications" {
+		return nil, errors.New("attempted to parse invalid isainfo output")
+	}
+
+	flags := make([]string, len(words)-4)
+	for i, val := range words[4:] {
+		flags[i] = val
+	}
+	sort.Strings(flags)
+
+	return flags, nil
+}
+
+var psrInfoMatch = regexp.MustCompile(`The physical processor has (?:([\d]+) virtual processor \(([\d]+)\)|([\d]+) cores and ([\d]+) virtual processors[^\n]+)\n(?:\s+ The core has.+\n)*\s+.+ \((\w+) ([\S]+) family (.+) model (.+) step (.+) clock (.+) MHz\)\n[\s]*(.*)`)
+
+const (
+	psrNumCoresOffset   = 1
+	psrNumCoresHTOffset = 3
+	psrNumHTOffset      = 4
+	psrVendorIDOffset   = 5
+	psrFamilyOffset     = 7
+	psrModelOffset      = 8
+	psrStepOffset       = 9
+	psrClockOffset      = 10
+	psrModelNameOffset  = 11
+)
+
+func parseProcessorInfo(cmdOutput string) ([]InfoStat, error) {
+	matches := psrInfoMatch.FindAllStringSubmatch(cmdOutput, -1)
+
+	var infoStatCount int32
+	result := make([]InfoStat, 0, len(matches))
+	for physicalIndex, physicalCPU := range matches {
+		var step int32
+		var clock float64
+
+		if physicalCPU[psrStepOffset] != "" {
+			stepParsed, err := strconv.ParseInt(physicalCPU[psrStepOffset], 10, 32)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse value %q for step as 32-bit integer: %s", physicalCPU[9], err)
+			}
+			step = int32(stepParsed)
+		}
+
+		if physicalCPU[psrClockOffset] != "" {
+			clockParsed, err := strconv.ParseInt(physicalCPU[psrClockOffset], 10, 64)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse value %q for clock as 32-bit integer: %s", physicalCPU[10], err)
+			}
+			clock = float64(clockParsed)
+		}
+
+		var err error
+		var numCores int64
+		var numHT int64
+		switch {
+		case physicalCPU[psrNumCoresOffset] != "":
+			numCores, err = strconv.ParseInt(physicalCPU[psrNumCoresOffset], 10, 32)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse value %q for core count as 32-bit integer: %s", physicalCPU[1], err)
+			}
+
+			for i := 0; i < int(numCores); i++ {
+				result = append(result, InfoStat{
+					CPU:        infoStatCount,
+					PhysicalID: strconv.Itoa(physicalIndex),
+					CoreID:     strconv.Itoa(i),
+					Cores:      1,
+					VendorID:   physicalCPU[psrVendorIDOffset],
+					ModelName:  physicalCPU[psrModelNameOffset],
+					Family:     physicalCPU[psrFamilyOffset],
+					Model:      physicalCPU[psrModelOffset],
+					Stepping:   step,
+					Mhz:        clock,
+				})
+				infoStatCount++
+			}
+		case physicalCPU[psrNumCoresHTOffset] != "":
+			numCores, err = strconv.ParseInt(physicalCPU[psrNumCoresHTOffset], 10, 32)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse value %q for core count as 32-bit integer: %s", physicalCPU[3], err)
+			}
+
+			numHT, err = strconv.ParseInt(physicalCPU[psrNumHTOffset], 10, 32)
+			if err != nil {
+				return nil, fmt.Errorf("cannot parse value %q for hyperthread count as 32-bit integer: %s", physicalCPU[4], err)
+			}
+
+			for i := 0; i < int(numCores); i++ {
+				result = append(result, InfoStat{
+					CPU:        infoStatCount,
+					PhysicalID: strconv.Itoa(physicalIndex),
+					CoreID:     strconv.Itoa(i),
+					Cores:      int32(numHT) / int32(numCores),
+					VendorID:   physicalCPU[psrVendorIDOffset],
+					ModelName:  physicalCPU[psrModelNameOffset],
+					Family:     physicalCPU[psrFamilyOffset],
+					Model:      physicalCPU[psrModelOffset],
+					Stepping:   step,
+					Mhz:        clock,
+				})
+				infoStatCount++
+			}
+		default:
+			return nil, errors.New("values for cores with and without hyperthreading are both set")
+		}
+	}
+	return result, nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

internal/gopsutil/cpu/cpu_windows.go

@@ -0,0 +1,256 @@
+//go:build windows
+
+package cpu
+
+import (
+	"context"
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	"github.com/gofiber/fiber/v2/internal/wmi"
+)
+
+var (
+	procGetActiveProcessorCount = common.Modkernel32.NewProc("GetActiveProcessorCount")
+	procGetNativeSystemInfo     = common.Modkernel32.NewProc("GetNativeSystemInfo")
+)
+
+type Win32_Processor struct {
+	LoadPercentage            *uint16
+	Family                    uint16
+	Manufacturer              string
+	Name                      string
+	NumberOfLogicalProcessors uint32
+	NumberOfCores             uint32
+	ProcessorID               *string
+	Stepping                  *string
+	MaxClockSpeed             uint32
+}
+
+// SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION
+// defined in windows api doc with the following
+// https://docs.microsoft.com/en-us/windows/desktop/api/winternl/nf-winternl-ntquerysysteminformation#system_processor_performance_information
+// additional fields documented here
+// https://www.geoffchappell.com/studies/windows/km/ntoskrnl/api/ex/sysinfo/processor_performance.htm
+type win32_SystemProcessorPerformanceInformation struct {
+	IdleTime       int64 // idle time in 100ns (this is not a filetime).
+	KernelTime     int64 // kernel time in 100ns.  kernel time includes idle time. (this is not a filetime).
+	UserTime       int64 // usertime in 100ns (this is not a filetime).
+	DpcTime        int64 // dpc time in 100ns (this is not a filetime).
+	InterruptTime  int64 // interrupt time in 100ns
+	InterruptCount uint32
+}
+
+// Win32_PerfFormattedData_PerfOS_System struct to have count of processes and processor queue length
+type Win32_PerfFormattedData_PerfOS_System struct {
+	Processes            uint32
+	ProcessorQueueLength uint32
+}
+
+const (
+	ClocksPerSec = 10000000.0
+
+	// systemProcessorPerformanceInformationClass information class to query with NTQuerySystemInformation
+	// https://processhacker.sourceforge.io/doc/ntexapi_8h.html#ad5d815b48e8f4da1ef2eb7a2f18a54e0
+	win32_SystemProcessorPerformanceInformationClass = 8
+
+	// size of systemProcessorPerformanceInfoSize in memory
+	win32_SystemProcessorPerformanceInfoSize = uint32(unsafe.Sizeof(win32_SystemProcessorPerformanceInformation{}))
+)
+
+// Times returns times stat per cpu and combined for all CPUs
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
+	if percpu {
+		return perCPUTimes()
+	}
+
+	var ret []TimesStat
+	var lpIdleTime common.FILETIME
+	var lpKernelTime common.FILETIME
+	var lpUserTime common.FILETIME
+	r, _, _ := common.ProcGetSystemTimes.Call(
+		uintptr(unsafe.Pointer(&lpIdleTime)),
+		uintptr(unsafe.Pointer(&lpKernelTime)),
+		uintptr(unsafe.Pointer(&lpUserTime)))
+	if r == 0 {
+		return ret, windows.GetLastError()
+	}
+
+	LOT := float64(0.0000001)
+	HIT := (LOT * 4294967296.0)
+	idle := ((HIT * float64(lpIdleTime.DwHighDateTime)) + (LOT * float64(lpIdleTime.DwLowDateTime)))
+	user := ((HIT * float64(lpUserTime.DwHighDateTime)) + (LOT * float64(lpUserTime.DwLowDateTime)))
+	kernel := ((HIT * float64(lpKernelTime.DwHighDateTime)) + (LOT * float64(lpKernelTime.DwLowDateTime)))
+	system := (kernel - idle)
+
+	ret = append(ret, TimesStat{
+		CPU:    "cpu-total",
+		Idle:   float64(idle),
+		User:   float64(user),
+		System: float64(system),
+	})
+	return ret, nil
+}
+
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	var ret []InfoStat
+	var dst []Win32_Processor
+	q := wmi.CreateQuery(&dst, "")
+	if err := common.WMIQueryWithContext(ctx, q, &dst); err != nil {
+		return ret, err
+	}
+
+	var procID string
+	for i, l := range dst {
+		procID = ""
+		if l.ProcessorID != nil {
+			procID = *l.ProcessorID
+		}
+
+		cpu := InfoStat{
+			CPU:        int32(i),
+			Family:     fmt.Sprintf("%d", l.Family),
+			VendorID:   l.Manufacturer,
+			ModelName:  l.Name,
+			Cores:      int32(l.NumberOfLogicalProcessors),
+			PhysicalID: procID,
+			Mhz:        float64(l.MaxClockSpeed),
+			Flags:      []string{},
+		}
+		ret = append(ret, cpu)
+	}
+
+	return ret, nil
+}
+
+// ProcInfo returns processes count and processor queue length in the system.
+// There is a single queue for processor even on multiprocessors systems.
+func ProcInfo() ([]Win32_PerfFormattedData_PerfOS_System, error) {
+	return ProcInfoWithContext(context.Background())
+}
+
+func ProcInfoWithContext(ctx context.Context) ([]Win32_PerfFormattedData_PerfOS_System, error) {
+	var ret []Win32_PerfFormattedData_PerfOS_System
+	q := wmi.CreateQuery(&ret, "")
+	err := common.WMIQueryWithContext(ctx, q, &ret)
+	if err != nil {
+		return []Win32_PerfFormattedData_PerfOS_System{}, err
+	}
+	return ret, err
+}
+
+// perCPUTimes returns times stat per cpu, per core and overall for all CPUs
+func perCPUTimes() ([]TimesStat, error) {
+	var ret []TimesStat
+	stats, err := perfInfo()
+	if err != nil {
+		return nil, err
+	}
+	for core, v := range stats {
+		c := TimesStat{
+			CPU:    fmt.Sprintf("cpu%d", core),
+			User:   float64(v.UserTime) / ClocksPerSec,
+			System: float64(v.KernelTime-v.IdleTime) / ClocksPerSec,
+			Idle:   float64(v.IdleTime) / ClocksPerSec,
+			Irq:    float64(v.InterruptTime) / ClocksPerSec,
+		}
+		ret = append(ret, c)
+	}
+	return ret, nil
+}
+
+// makes call to Windows API function to retrieve performance information for each core
+func perfInfo() ([]win32_SystemProcessorPerformanceInformation, error) {
+	// Make maxResults large for safety.
+	// We can't invoke the api call with a results array that's too small.
+	// If we have more than 2056 cores on a single host, then it's probably the future.
+	maxBuffer := 2056
+	// buffer for results from the windows proc
+	resultBuffer := make([]win32_SystemProcessorPerformanceInformation, maxBuffer)
+	// size of the buffer in memory
+	bufferSize := uintptr(win32_SystemProcessorPerformanceInfoSize) * uintptr(maxBuffer)
+	// size of the returned response
+	var retSize uint32
+
+	// Invoke windows api proc.
+	// The returned err from the windows dll proc will always be non-nil even when successful.
+	// See https://godoc.org/golang.org/x/sys/windows#LazyProc.Call for more information
+	retCode, _, err := common.ProcNtQuerySystemInformation.Call(
+		win32_SystemProcessorPerformanceInformationClass, // System Information Class -> SystemProcessorPerformanceInformation
+		uintptr(unsafe.Pointer(&resultBuffer[0])),        // pointer to first element in result buffer
+		bufferSize,                        // size of the buffer in memory
+		uintptr(unsafe.Pointer(&retSize)), // pointer to the size of the returned results the windows proc will set this
+	)
+
+	// check return code for errors
+	if retCode != 0 {
+		return nil, fmt.Errorf("call to NtQuerySystemInformation returned %d. err: %s", retCode, err.Error())
+	}
+
+	// calculate the number of returned elements based on the returned size
+	numReturnedElements := retSize / win32_SystemProcessorPerformanceInfoSize
+
+	// trim results to the number of returned elements
+	resultBuffer = resultBuffer[:numReturnedElements]
+
+	return resultBuffer, nil
+}
+
+// SystemInfo is an equivalent representation of SYSTEM_INFO in the Windows API.
+// https://msdn.microsoft.com/en-us/library/ms724958%28VS.85%29.aspx?f=255&MSPPError=-2147217396
+// https://github.com/elastic/go-windows/blob/bb1581babc04d5cb29a2bfa7a9ac6781c730c8dd/kernel32.go#L43
+type systemInfo struct {
+	wProcessorArchitecture      uint16
+	wReserved                   uint16
+	dwPageSize                  uint32
+	lpMinimumApplicationAddress uintptr
+	lpMaximumApplicationAddress uintptr
+	dwActiveProcessorMask       uintptr
+	dwNumberOfProcessors        uint32
+	dwProcessorType             uint32
+	dwAllocationGranularity     uint32
+	wProcessorLevel             uint16
+	wProcessorRevision          uint16
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	if logical {
+		// https://github.com/giampaolo/psutil/blob/d01a9eaa35a8aadf6c519839e987a49d8be2d891/psutil/_psutil_windows.c#L97
+		err := procGetActiveProcessorCount.Find()
+		if err == nil { // Win7+
+			ret, _, _ := procGetActiveProcessorCount.Call(uintptr(0xffff)) // ALL_PROCESSOR_GROUPS is 0xffff according to Rust's winapi lib https://docs.rs/winapi/*/x86_64-pc-windows-msvc/src/winapi/shared/ntdef.rs.html#120
+			if ret != 0 {
+				return int(ret), nil
+			}
+		}
+		var systemInfo systemInfo
+		_, _, err = procGetNativeSystemInfo.Call(uintptr(unsafe.Pointer(&systemInfo)))
+		if systemInfo.dwNumberOfProcessors == 0 {
+			return 0, err
+		}
+		return int(systemInfo.dwNumberOfProcessors), nil
+	}
+	// physical cores https://github.com/giampaolo/psutil/blob/d01a9eaa35a8aadf6c519839e987a49d8be2d891/psutil/_psutil_windows.c#L499
+	// for the time being, try with unreliable and slow WMI call…
+	var dst []Win32_Processor
+	q := wmi.CreateQuery(&dst, "")
+	if err := common.WMIQueryWithContext(ctx, q, &dst); err != nil {
+		return 0, err
+	}
+	var count uint32
+	for _, d := range dst {
+		count += d.NumberOfCores
+	}
+	return int(count), nil
+}

internal/gopsutil/load/load.go

@@ -0,0 +1,30 @@
+package load
+
+import (
+	"encoding/json"
+)
+
+// var invoke common.Invoker = common.Invoke{}
+type AvgStat struct {
+	Load1  float64 `json:"load1"`
+	Load5  float64 `json:"load5"`
+	Load15 float64 `json:"load15"`
+}
+
+func (l AvgStat) String() string {
+	s, _ := json.Marshal(l)
+	return string(s)
+}
+
+type MiscStat struct {
+	ProcsTotal   int64 `json:"procsTotal"`
+	ProcsCreated int64 `json:"procsCreated"`
+	ProcsRunning int64 `json:"procsRunning"`
+	ProcsBlocked int64 `json:"procsBlocked"`
+	Ctxt         int64 `json:"ctxt"`
+}
+
+func (m MiscStat) String() string {
+	s, _ := json.Marshal(m)
+	return string(s)
+}

internal/gopsutil/load/load_bsd.go

@@ -0,0 +1,84 @@
+//go:build freebsd || openbsd
+
+package load
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var invoke common.Invoker = common.Invoke{}
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	// This SysctlRaw method borrowed from
+	// https://github.com/prometheus/node_exporter/blob/master/collector/loadavg_freebsd.go
+	type loadavg struct {
+		load  [3]uint32
+		scale int
+	}
+	b, err := unix.SysctlRaw("vm.loadavg")
+	if err != nil {
+		return nil, err
+	}
+	load := *(*loadavg)(unsafe.Pointer((&b[0])))
+	scale := float64(load.scale)
+	ret := &AvgStat{
+		Load1:  float64(load.load[0]) / scale,
+		Load5:  float64(load.load[1]) / scale,
+		Load15: float64(load.load[2]) / scale,
+	}
+
+	return ret, nil
+}
+
+type forkstat struct {
+	forks    int
+	vforks   int
+	__tforks int
+}
+
+// Misc returns miscellaneous host-wide statistics.
+// darwin use ps command to get process running/blocked count.
+// Almost same as Darwin implementation, but state is different.
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	bin, err := exec.LookPath("ps")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, bin, "axo", "state")
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(out), "\n")
+
+	ret := MiscStat{}
+	for _, l := range lines {
+		if strings.Contains(l, "R") {
+			ret.ProcsRunning++
+		} else if strings.Contains(l, "D") {
+			ret.ProcsBlocked++
+		}
+	}
+
+	f, err := getForkStat()
+	if err != nil {
+		return nil, err
+	}
+	ret.ProcsCreated = int64(f.forks)
+
+	return &ret, nil
+}

internal/gopsutil/load/load_darwin.go

@@ -0,0 +1,75 @@
+//go:build darwin
+
+package load
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var invoke common.Invoker = common.Invoke{}
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	// This SysctlRaw method borrowed from
+	// https://github.com/prometheus/node_exporter/blob/master/collector/loadavg_freebsd.go
+	// this implementation is common with BSDs
+	type loadavg struct {
+		load  [3]uint32
+		scale int
+	}
+	b, err := unix.SysctlRaw("vm.loadavg")
+	if err != nil {
+		return nil, err
+	}
+	load := *(*loadavg)(unsafe.Pointer((&b[0])))
+	scale := float64(load.scale)
+	ret := &AvgStat{
+		Load1:  float64(load.load[0]) / scale,
+		Load5:  float64(load.load[1]) / scale,
+		Load15: float64(load.load[2]) / scale,
+	}
+
+	return ret, nil
+}
+
+// Misc returnes miscellaneous host-wide statistics.
+// darwin use ps command to get process running/blocked count.
+// Almost same as FreeBSD implementation, but state is different.
+// U means 'Uninterruptible Sleep'.
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	bin, err := exec.LookPath("ps")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, bin, "axo", "state")
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(out), "\n")
+
+	ret := MiscStat{}
+	for _, l := range lines {
+		if strings.Contains(l, "R") {
+			ret.ProcsRunning++
+		} else if strings.Contains(l, "U") {
+			// uninterruptible sleep == blocked
+			ret.ProcsBlocked++
+		}
+	}
+
+	return &ret, nil
+}

internal/gopsutil/load/load_fallback.go

@@ -0,0 +1,25 @@
+//go:build !darwin && !linux && !freebsd && !openbsd && !windows && !solaris
+
+package load
+
+import (
+	"context"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	return nil, common.ErrNotImplementedError
+}

internal/gopsutil/load/load_freebsd.go

@@ -0,0 +1,7 @@
+//go:build freebsd
+
+package load
+
+func getForkStat() (forkstat, error) {
+	return forkstat{}, nil
+}

internal/gopsutil/load/load_linux.go

@@ -0,0 +1,135 @@
+//go:build linux
+
+package load
+
+import (
+	"context"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	stat, err := fileAvgWithContext(ctx)
+	if err != nil {
+		stat, err = sysinfoAvgWithContext(ctx)
+	}
+	return stat, err
+}
+
+func sysinfoAvgWithContext(ctx context.Context) (*AvgStat, error) {
+	var info syscall.Sysinfo_t
+	err := syscall.Sysinfo(&info)
+	if err != nil {
+		return nil, err
+	}
+
+	const si_load_shift = 16
+	return &AvgStat{
+		Load1:  float64(info.Loads[0]) / float64(1<<si_load_shift),
+		Load5:  float64(info.Loads[1]) / float64(1<<si_load_shift),
+		Load15: float64(info.Loads[2]) / float64(1<<si_load_shift),
+	}, nil
+}
+
+func fileAvgWithContext(ctx context.Context) (*AvgStat, error) {
+	values, err := readLoadAvgFromFile()
+	if err != nil {
+		return nil, err
+	}
+
+	load1, err := strconv.ParseFloat(values[0], 64)
+	if err != nil {
+		return nil, err
+	}
+	load5, err := strconv.ParseFloat(values[1], 64)
+	if err != nil {
+		return nil, err
+	}
+	load15, err := strconv.ParseFloat(values[2], 64)
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &AvgStat{
+		Load1:  load1,
+		Load5:  load5,
+		Load15: load15,
+	}
+
+	return ret, nil
+}
+
+// Misc returnes miscellaneous host-wide statistics.
+// Note: the name should be changed near future.
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	filename := common.HostProc("stat")
+	out, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &MiscStat{}
+	lines := strings.Split(string(out), "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) != 2 {
+			continue
+		}
+		v, err := strconv.ParseInt(fields[1], 10, 64)
+		if err != nil {
+			continue
+		}
+		switch fields[0] {
+		case "processes":
+			ret.ProcsCreated = v
+		case "procs_running":
+			ret.ProcsRunning = v
+		case "procs_blocked":
+			ret.ProcsBlocked = v
+		case "ctxt":
+			ret.Ctxt = v
+		default:
+			continue
+		}
+
+	}
+
+	procsTotal, err := getProcsTotal()
+	if err != nil {
+		return ret, err
+	}
+	ret.ProcsTotal = procsTotal
+
+	return ret, nil
+}
+
+func getProcsTotal() (int64, error) {
+	values, err := readLoadAvgFromFile()
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseInt(strings.Split(values[3], "/")[1], 10, 64)
+}
+
+func readLoadAvgFromFile() ([]string, error) {
+	loadavgFilename := common.HostProc("loadavg")
+	line, err := os.ReadFile(loadavgFilename)
+	if err != nil {
+		return nil, err
+	}
+
+	values := strings.Fields(string(line))
+	return values, nil
+}

internal/gopsutil/load/load_openbsd.go

@@ -0,0 +1,17 @@
+//go:build openbsd
+
+package load
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func getForkStat() (forkstat, error) {
+	b, err := unix.SysctlRaw("kern.forkstat")
+	if err != nil {
+		return forkstat{}, err
+	}
+	return *(*forkstat)(unsafe.Pointer((&b[0]))), nil
+}

internal/gopsutil/load/load_solaris.go

@@ -0,0 +1,44 @@
+//go:build solaris
+
+package load
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	bin, err := exec.LookPath("ps")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, bin, "-efo", "s")
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(out), "\n")
+
+	ret := MiscStat{}
+	for _, l := range lines {
+		if l == "O" {
+			ret.ProcsRunning++
+		}
+	}
+
+	return &ret, nil
+}

internal/gopsutil/load/load_windows.go

@@ -0,0 +1,84 @@
+//go:build windows
+
+package load
+
+import (
+	"context"
+	"log"
+	"math"
+	"sync"
+	"time"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	loadErr              error
+	loadAvg1M            float64 = 0.0
+	loadAvg5M            float64 = 0.0
+	loadAvg15M           float64 = 0.0
+	loadAvgMutex         sync.RWMutex
+	loadAvgGoroutineOnce sync.Once
+)
+
+// loadAvgGoroutine updates avg data by fetching current load by interval
+// TODO instead of this goroutine, we can register a Win32 counter just as psutil does
+// see https://psutil.readthedocs.io/en/latest/#psutil.getloadavg
+// code https://github.com/giampaolo/psutil/blob/8415355c8badc9c94418b19bdf26e622f06f0cce/psutil/arch/windows/wmi.c
+func loadAvgGoroutine() {
+	var (
+		samplingFrequency time.Duration = 5 * time.Second
+		loadAvgFactor1M   float64       = 1 / math.Exp(samplingFrequency.Seconds()/time.Minute.Seconds())
+		loadAvgFactor5M   float64       = 1 / math.Exp(samplingFrequency.Seconds()/(5*time.Minute).Seconds())
+		loadAvgFactor15M  float64       = 1 / math.Exp(samplingFrequency.Seconds()/(15*time.Minute).Seconds())
+		currentLoad       float64
+	)
+
+	counter, err := common.ProcessorQueueLengthCounter()
+	if err != nil || counter == nil {
+		log.Println("gopsutil: unexpected processor queue length counter error, please file an issue on github: err")
+		return
+	}
+
+	tick := time.NewTicker(samplingFrequency).C
+	for {
+		currentLoad, err = counter.GetValue()
+		loadAvgMutex.Lock()
+		loadErr = err
+		loadAvg1M = loadAvg1M*loadAvgFactor1M + currentLoad*(1-loadAvgFactor1M)
+		loadAvg5M = loadAvg5M*loadAvgFactor5M + currentLoad*(1-loadAvgFactor5M)
+		loadAvg15M = loadAvg15M*loadAvgFactor15M + currentLoad*(1-loadAvgFactor15M)
+		loadAvgMutex.Unlock()
+		<-tick
+	}
+}
+
+// Avg for Windows may return 0 values for the first few 5 second intervals
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	loadAvgGoroutineOnce.Do(func() {
+		go loadAvgGoroutine()
+	})
+	loadAvgMutex.RLock()
+	defer loadAvgMutex.RUnlock()
+	ret := AvgStat{
+		Load1:  loadAvg1M,
+		Load5:  loadAvg5M,
+		Load15: loadAvg15M,
+	}
+
+	return &ret, loadErr
+}
+
+func Misc() (*MiscStat, error) {
+	return MiscWithContext(context.Background())
+}
+
+func MiscWithContext(ctx context.Context) (*MiscStat, error) {
+	ret := MiscStat{}
+
+	return &ret, common.ErrNotImplementedError
+}

internal/gopsutil/mem/mem.go

@@ -0,0 +1,106 @@
+package mem
+
+import (
+	"encoding/json"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+//lint:ignore U1000 we need this elsewhere
+var invoke common.Invoker = common.Invoke{} //nolint:all
+
+// Memory usage statistics. Total, Available and Used contain numbers of bytes
+// for human consumption.
+//
+// The other fields in this struct contain kernel specific values.
+type VirtualMemoryStat struct {
+	// Total amount of RAM on this system
+	Total uint64 `json:"total"`
+
+	// RAM available for programs to allocate
+	//
+	// This value is computed from the kernel specific values.
+	Available uint64 `json:"available"`
+
+	// RAM used by programs
+	//
+	// This value is computed from the kernel specific values.
+	Used uint64 `json:"used"`
+
+	// Percentage of RAM used by programs
+	//
+	// This value is computed from the kernel specific values.
+	UsedPercent float64 `json:"usedPercent"`
+
+	// This is the kernel's notion of free memory; RAM chips whose bits nobody
+	// cares about the value of right now. For a human consumable number,
+	// Available is what you really want.
+	Free uint64 `json:"free"`
+
+	// OS X / BSD specific numbers:
+	// http://www.macyourself.com/2010/02/17/what-is-free-wired-active-and-inactive-system-memory-ram/
+	Active   uint64 `json:"active"`
+	Inactive uint64 `json:"inactive"`
+	Wired    uint64 `json:"wired"`
+
+	// FreeBSD specific numbers:
+	// https://reviews.freebsd.org/D8467
+	Laundry uint64 `json:"laundry"`
+
+	// Linux specific numbers
+	// https://www.centos.org/docs/5/html/5.1/Deployment_Guide/s2-proc-meminfo.html
+	// https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+	// https://www.kernel.org/doc/Documentation/vm/overcommit-accounting
+	Buffers        uint64 `json:"buffers"`
+	Cached         uint64 `json:"cached"`
+	Writeback      uint64 `json:"writeback"`
+	Dirty          uint64 `json:"dirty"`
+	WritebackTmp   uint64 `json:"writebacktmp"`
+	Shared         uint64 `json:"shared"`
+	Slab           uint64 `json:"slab"`
+	SReclaimable   uint64 `json:"sreclaimable"`
+	SUnreclaim     uint64 `json:"sunreclaim"`
+	PageTables     uint64 `json:"pagetables"`
+	SwapCached     uint64 `json:"swapcached"`
+	CommitLimit    uint64 `json:"commitlimit"`
+	CommittedAS    uint64 `json:"committedas"`
+	HighTotal      uint64 `json:"hightotal"`
+	HighFree       uint64 `json:"highfree"`
+	LowTotal       uint64 `json:"lowtotal"`
+	LowFree        uint64 `json:"lowfree"`
+	SwapTotal      uint64 `json:"swaptotal"`
+	SwapFree       uint64 `json:"swapfree"`
+	Mapped         uint64 `json:"mapped"`
+	VMallocTotal   uint64 `json:"vmalloctotal"`
+	VMallocUsed    uint64 `json:"vmallocused"`
+	VMallocChunk   uint64 `json:"vmallocchunk"`
+	HugePagesTotal uint64 `json:"hugepagestotal"`
+	HugePagesFree  uint64 `json:"hugepagesfree"`
+	HugePageSize   uint64 `json:"hugepagesize"`
+}
+
+type SwapMemoryStat struct {
+	Total       uint64  `json:"total"`
+	Used        uint64  `json:"used"`
+	Free        uint64  `json:"free"`
+	UsedPercent float64 `json:"usedPercent"`
+	Sin         uint64  `json:"sin"`
+	Sout        uint64  `json:"sout"`
+	PgIn        uint64  `json:"pgin"`
+	PgOut       uint64  `json:"pgout"`
+	PgFault     uint64  `json:"pgfault"`
+
+	// Linux specific numbers
+	// https://www.kernel.org/doc/Documentation/cgroup-v2.txt
+	PgMajFault uint64 `json:"pgmajfault"`
+}
+
+func (m VirtualMemoryStat) String() string {
+	s, _ := json.Marshal(m)
+	return string(s)
+}
+
+func (m SwapMemoryStat) String() string {
+	s, _ := json.Marshal(m)
+	return string(s)
+}

internal/gopsutil/mem/mem_darwin.go

@@ -0,0 +1,69 @@
+//go:build darwin
+
+package mem
+
+import (
+	"context"
+	"encoding/binary"
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func getHwMemsize() (uint64, error) {
+	totalString, err := unix.Sysctl("hw.memsize")
+	if err != nil {
+		return 0, err
+	}
+
+	// unix.sysctl() helpfully assumes the result is a null-terminated string and
+	// removes the last byte of the result if it's 0 :/
+	totalString += "\x00"
+
+	total := uint64(binary.LittleEndian.Uint64([]byte(totalString)))
+
+	return total, nil
+}
+
+// xsw_usage in sys/sysctl.h
+type swapUsage struct {
+	Total     uint64
+	Avail     uint64
+	Used      uint64
+	Pagesize  int32
+	Encrypted bool
+}
+
+// SwapMemory returns swapinfo.
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	// https://github.com/yanllearnn/go-osstat/blob/ae8a279d26f52ec946a03698c7f50a26cfb427e3/memory/memory_darwin.go
+	var ret *SwapMemoryStat
+
+	value, err := unix.SysctlRaw("vm.swapusage")
+	if err != nil {
+		return ret, err
+	}
+	if len(value) != 32 {
+		return ret, fmt.Errorf("unexpected output of sysctl vm.swapusage: %v (len: %d)", value, len(value))
+	}
+	swap := (*swapUsage)(unsafe.Pointer(&value[0]))
+
+	u := float64(0)
+	if swap.Total != 0 {
+		u = ((float64(swap.Total) - float64(swap.Avail)) / float64(swap.Total)) * 100.0
+	}
+
+	ret = &SwapMemoryStat{
+		Total:       swap.Total,
+		Used:        swap.Used,
+		Free:        swap.Avail,
+		UsedPercent: u,
+	}
+
+	return ret, nil
+}

internal/gopsutil/mem/mem_darwin_cgo.go

@@ -0,0 +1,58 @@
+//go:build darwin && cgo
+
+package mem
+
+/*
+#include <mach/mach_host.h>
+*/
+import "C"
+
+import (
+	"context"
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+// VirtualMemory returns VirtualmemoryStat.
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	count := C.mach_msg_type_number_t(C.HOST_VM_INFO_COUNT)
+	var vmstat C.vm_statistics_data_t
+
+	status := C.host_statistics(C.host_t(C.mach_host_self()),
+		C.HOST_VM_INFO,
+		C.host_info_t(unsafe.Pointer(&vmstat)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return nil, fmt.Errorf("host_statistics error=%d", status)
+	}
+
+	pageSize := uint64(unix.Getpagesize())
+	total, err := getHwMemsize()
+	if err != nil {
+		return nil, err
+	}
+	totalCount := C.natural_t(total / pageSize)
+
+	availableCount := vmstat.inactive_count + vmstat.free_count
+	usedPercent := 100 * float64(totalCount-availableCount) / float64(totalCount)
+
+	usedCount := totalCount - availableCount
+
+	return &VirtualMemoryStat{
+		Total:       total,
+		Available:   pageSize * uint64(availableCount),
+		Used:        pageSize * uint64(usedCount),
+		UsedPercent: usedPercent,
+		Free:        pageSize * uint64(vmstat.free_count),
+		Active:      pageSize * uint64(vmstat.active_count),
+		Inactive:    pageSize * uint64(vmstat.inactive_count),
+		Wired:       pageSize * uint64(vmstat.wire_count),
+	}, nil
+}

internal/gopsutil/mem/mem_darwin_nocgo.go

@@ -0,0 +1,93 @@
+//go:build darwin && !cgo
+
+package mem
+
+import (
+	"context"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+// Runs vm_stat and returns Free and inactive pages
+func getVMStat(vms *VirtualMemoryStat) error {
+	vm_stat, err := exec.LookPath("vm_stat")
+	if err != nil {
+		return err
+	}
+	out, err := invoke.Command(vm_stat)
+	if err != nil {
+		return err
+	}
+	return parseVMStat(string(out), vms)
+}
+
+func parseVMStat(out string, vms *VirtualMemoryStat) error {
+	var err error
+
+	lines := strings.Split(out, "\n")
+	pagesize := uint64(unix.Getpagesize())
+	for _, line := range lines {
+		fields := strings.Split(line, ":")
+		if len(fields) < 2 {
+			continue
+		}
+		key := strings.TrimSpace(fields[0])
+		value := strings.Trim(fields[1], " .")
+		switch key {
+		case "Pages free":
+			free, e := strconv.ParseUint(value, 10, 64)
+			if e != nil {
+				err = e
+			}
+			vms.Free = free * pagesize
+		case "Pages inactive":
+			inactive, e := strconv.ParseUint(value, 10, 64)
+			if e != nil {
+				err = e
+			}
+			vms.Inactive = inactive * pagesize
+		case "Pages active":
+			active, e := strconv.ParseUint(value, 10, 64)
+			if e != nil {
+				err = e
+			}
+			vms.Active = active * pagesize
+		case "Pages wired down":
+			wired, e := strconv.ParseUint(value, 10, 64)
+			if e != nil {
+				err = e
+			}
+			vms.Wired = wired * pagesize
+		}
+	}
+	return err
+}
+
+// VirtualMemory returns VirtualmemoryStat.
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	ret := &VirtualMemoryStat{}
+
+	total, err := getHwMemsize()
+	if err != nil {
+		return nil, err
+	}
+	err = getVMStat(ret)
+	if err != nil {
+		return nil, err
+	}
+
+	ret.Available = ret.Free + ret.Inactive
+	ret.Total = total
+
+	ret.Used = ret.Total - ret.Available
+	ret.UsedPercent = 100 * float64(ret.Used) / float64(ret.Total)
+
+	return ret, nil
+}

internal/gopsutil/mem/mem_fallback.go

@@ -0,0 +1,25 @@
+//go:build !darwin && !linux && !freebsd && !openbsd && !solaris && !windows
+
+package mem
+
+import (
+	"context"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	return nil, common.ErrNotImplementedError
+}

internal/gopsutil/mem/mem_freebsd.go

@@ -0,0 +1,167 @@
+//go:build freebsd
+
+package mem
+
+import (
+	"context"
+	"errors"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	pageSize, err := common.SysctlUint("vm.stats.vm.v_page_size")
+	if err != nil {
+		return nil, err
+	}
+	physmem, err := common.SysctlUint("hw.physmem")
+	if err != nil {
+		return nil, err
+	}
+
+	free, err := common.SysctlUint("vm.stats.vm.v_free_count")
+	if err != nil {
+		return nil, err
+	}
+	active, err := common.SysctlUint("vm.stats.vm.v_active_count")
+	if err != nil {
+		return nil, err
+	}
+	inactive, err := common.SysctlUint("vm.stats.vm.v_inactive_count")
+	if err != nil {
+		return nil, err
+	}
+	buffers, err := common.SysctlUint("vfs.bufspace")
+	if err != nil {
+		return nil, err
+	}
+	wired, err := common.SysctlUint("vm.stats.vm.v_wire_count")
+	if err != nil {
+		return nil, err
+	}
+	var cached, laundry uint64
+	osreldate, _ := common.SysctlUint("kern.osreldate")
+	if osreldate < 1102000 {
+		cached, err = common.SysctlUint("vm.stats.vm.v_cache_count")
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		laundry, err = common.SysctlUint("vm.stats.vm.v_laundry_count")
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	p := pageSize
+	ret := &VirtualMemoryStat{
+		Total:    physmem,
+		Free:     free * p,
+		Active:   active * p,
+		Inactive: inactive * p,
+		Cached:   cached * p,
+		Buffers:  buffers,
+		Wired:    wired * p,
+		Laundry:  laundry * p,
+	}
+
+	ret.Available = ret.Inactive + ret.Cached + ret.Free + ret.Laundry
+	ret.Used = ret.Total - ret.Available
+	ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
+
+	return ret, nil
+}
+
+// Return swapinfo
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+// Constants from vm/vm_param.h
+// nolint: golint
+const (
+	XSWDEV_VERSION11 = 1
+	XSWDEV_VERSION   = 2
+)
+
+// Types from vm/vm_param.h
+type xswdev struct {
+	Version uint32 // Version is the version
+	Dev     uint64 // Dev is the device identifier
+	Flags   int32  // Flags is the swap flags applied to the device
+	NBlks   int32  // NBlks is the total number of blocks
+	Used    int32  // Used is the number of blocks used
+}
+
+// xswdev11 is a compatibility for under FreeBSD 11
+// sys/vm/swap_pager.c
+type xswdev11 struct {
+	Version uint32 // Version is the version
+	Dev     uint32 // Dev is the device identifier
+	Flags   int32  // Flags is the swap flags applied to the device
+	NBlks   int32  // NBlks is the total number of blocks
+	Used    int32  // Used is the number of blocks used
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	// FreeBSD can have multiple swap devices so we total them up
+	i, err := common.SysctlUint("vm.nswapdev")
+	if err != nil {
+		return nil, err
+	}
+
+	if i == 0 {
+		return nil, errors.New("no swap devices found")
+	}
+
+	c := int(i)
+
+	i, err = common.SysctlUint("vm.stats.vm.v_page_size")
+	if err != nil {
+		return nil, err
+	}
+	pageSize := i
+
+	var buf []byte
+	s := &SwapMemoryStat{}
+	for n := 0; n < c; n++ {
+		buf, err = unix.SysctlRaw("vm.swap_info", n)
+		if err != nil {
+			return nil, err
+		}
+
+		// first, try to parse with version 2
+		xsw := (*xswdev)(unsafe.Pointer(&buf[0]))
+		if xsw.Version == XSWDEV_VERSION11 {
+			// this is version 1, so try to parse again
+			xsw := (*xswdev11)(unsafe.Pointer(&buf[0]))
+			if xsw.Version != XSWDEV_VERSION11 {
+				return nil, errors.New("xswdev version mismatch(11)")
+			}
+			s.Total += uint64(xsw.NBlks)
+			s.Used += uint64(xsw.Used)
+		} else if xsw.Version != XSWDEV_VERSION {
+			return nil, errors.New("xswdev version mismatch")
+		} else {
+			s.Total += uint64(xsw.NBlks)
+			s.Used += uint64(xsw.Used)
+		}
+
+	}
+
+	if s.Total != 0 {
+		s.UsedPercent = float64(s.Used) / float64(s.Total) * 100
+	}
+	s.Total *= pageSize
+	s.Used *= pageSize
+	s.Free = s.Total - s.Used
+
+	return s, nil
+}

internal/gopsutil/mem/mem_linux.go

@@ -0,0 +1,283 @@
+//go:build linux
+
+package mem
+
+import (
+	"context"
+	"encoding/json"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+type VirtualMemoryExStat struct {
+	ActiveFile   uint64 `json:"activefile"`
+	InactiveFile uint64 `json:"inactivefile"`
+	ActiveAnon   uint64 `json:"activeanon"`
+	InactiveAnon uint64 `json:"inactiveanon"`
+	Unevictable  uint64 `json:"unevictable"`
+}
+
+func (v VirtualMemoryExStat) String() string {
+	s, _ := json.Marshal(v)
+	return string(s)
+}
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	vm, _, err := fillFromMeminfoWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return vm, nil
+}
+
+func VirtualMemoryEx() (*VirtualMemoryExStat, error) {
+	return VirtualMemoryExWithContext(context.Background())
+}
+
+func VirtualMemoryExWithContext(ctx context.Context) (*VirtualMemoryExStat, error) {
+	_, vmEx, err := fillFromMeminfoWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return vmEx, nil
+}
+
+func fillFromMeminfoWithContext(ctx context.Context) (*VirtualMemoryStat, *VirtualMemoryExStat, error) {
+	filename := common.HostProc("meminfo")
+	lines, _ := common.ReadLines(filename)
+
+	// flag if MemAvailable is in /proc/meminfo (kernel 3.14+)
+	memavail := false
+	activeFile := false   // "Active(file)" not available: 2.6.28 / Dec 2008
+	inactiveFile := false // "Inactive(file)" not available: 2.6.28 / Dec 2008
+	sReclaimable := false // "SReclaimable:" not available: 2.6.19 / Nov 2006
+
+	ret := &VirtualMemoryStat{}
+	retEx := &VirtualMemoryExStat{}
+
+	for _, line := range lines {
+		fields := strings.Split(line, ":")
+		if len(fields) != 2 {
+			continue
+		}
+		key := strings.TrimSpace(fields[0])
+		value := strings.TrimSpace(fields[1])
+		value = strings.Replace(value, " kB", "", -1)
+
+		t, err := strconv.ParseUint(value, 10, 64)
+		if err != nil {
+			return ret, retEx, err
+		}
+		switch key {
+		case "MemTotal":
+			ret.Total = t * 1024
+		case "MemFree":
+			ret.Free = t * 1024
+		case "MemAvailable":
+			memavail = true
+			ret.Available = t * 1024
+		case "Buffers":
+			ret.Buffers = t * 1024
+		case "Cached":
+			ret.Cached = t * 1024
+		case "Active":
+			ret.Active = t * 1024
+		case "Inactive":
+			ret.Inactive = t * 1024
+		case "Active(anon)":
+			retEx.ActiveAnon = t * 1024
+		case "Inactive(anon)":
+			retEx.InactiveAnon = t * 1024
+		case "Active(file)":
+			activeFile = true
+			retEx.ActiveFile = t * 1024
+		case "Inactive(file)":
+			inactiveFile = true
+			retEx.InactiveFile = t * 1024
+		case "Unevictable":
+			retEx.Unevictable = t * 1024
+		case "Writeback":
+			ret.Writeback = t * 1024
+		case "WritebackTmp":
+			ret.WritebackTmp = t * 1024
+		case "Dirty":
+			ret.Dirty = t * 1024
+		case "Shmem":
+			ret.Shared = t * 1024
+		case "Slab":
+			ret.Slab = t * 1024
+		case "SReclaimable":
+			sReclaimable = true
+			ret.SReclaimable = t * 1024
+		case "SUnreclaim":
+			ret.SUnreclaim = t * 1024
+		case "PageTables":
+			ret.PageTables = t * 1024
+		case "SwapCached":
+			ret.SwapCached = t * 1024
+		case "CommitLimit":
+			ret.CommitLimit = t * 1024
+		case "Committed_AS":
+			ret.CommittedAS = t * 1024
+		case "HighTotal":
+			ret.HighTotal = t * 1024
+		case "HighFree":
+			ret.HighFree = t * 1024
+		case "LowTotal":
+			ret.LowTotal = t * 1024
+		case "LowFree":
+			ret.LowFree = t * 1024
+		case "SwapTotal":
+			ret.SwapTotal = t * 1024
+		case "SwapFree":
+			ret.SwapFree = t * 1024
+		case "Mapped":
+			ret.Mapped = t * 1024
+		case "VmallocTotal":
+			ret.VMallocTotal = t * 1024
+		case "VmallocUsed":
+			ret.VMallocUsed = t * 1024
+		case "VmallocChunk":
+			ret.VMallocChunk = t * 1024
+		case "HugePages_Total":
+			ret.HugePagesTotal = t
+		case "HugePages_Free":
+			ret.HugePagesFree = t
+		case "Hugepagesize":
+			ret.HugePageSize = t * 1024
+		}
+	}
+
+	ret.Cached += ret.SReclaimable
+
+	if !memavail {
+		if activeFile && inactiveFile && sReclaimable {
+			ret.Available = calcuateAvailVmem(ret, retEx)
+		} else {
+			ret.Available = ret.Cached + ret.Free
+		}
+	}
+
+	ret.Used = ret.Total - ret.Free - ret.Buffers - ret.Cached
+	ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
+
+	return ret, retEx, nil
+}
+
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	sysinfo := &unix.Sysinfo_t{}
+
+	if err := unix.Sysinfo(sysinfo); err != nil {
+		return nil, err
+	}
+	ret := &SwapMemoryStat{
+		Total: uint64(sysinfo.Totalswap) * uint64(sysinfo.Unit),
+		Free:  uint64(sysinfo.Freeswap) * uint64(sysinfo.Unit),
+	}
+	ret.Used = ret.Total - ret.Free
+	// check Infinity
+	if ret.Total != 0 {
+		ret.UsedPercent = float64(ret.Total-ret.Free) / float64(ret.Total) * 100.0
+	} else {
+		ret.UsedPercent = 0
+	}
+	filename := common.HostProc("vmstat")
+	lines, _ := common.ReadLines(filename)
+	for _, l := range lines {
+		fields := strings.Fields(l)
+		if len(fields) < 2 {
+			continue
+		}
+		switch fields[0] {
+		case "pswpin":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.Sin = value * 4 * 1024
+		case "pswpout":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.Sout = value * 4 * 1024
+		case "pgpgin":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.PgIn = value * 4 * 1024
+		case "pgpgout":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.PgOut = value * 4 * 1024
+		case "pgfault":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.PgFault = value * 4 * 1024
+		case "pgmajfault":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.PgMajFault = value * 4 * 1024
+		}
+	}
+	return ret, nil
+}
+
+// calcuateAvailVmem is a fallback under kernel 3.14 where /proc/meminfo does not provide
+// "MemAvailable:" column. It reimplements an algorithm from the link below
+// https://github.com/giampaolo/psutil/pull/890
+func calcuateAvailVmem(ret *VirtualMemoryStat, retEx *VirtualMemoryExStat) uint64 {
+	var watermarkLow uint64
+
+	fn := common.HostProc("zoneinfo")
+	lines, err := common.ReadLines(fn)
+	if err != nil {
+		return ret.Free + ret.Cached // fallback under kernel 2.6.13
+	}
+
+	pagesize := uint64(os.Getpagesize())
+	watermarkLow = 0
+
+	for _, line := range lines {
+		fields := strings.Fields(line)
+
+		if strings.HasPrefix(fields[0], "low") {
+			lowValue, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				lowValue = 0
+			}
+			watermarkLow += lowValue
+		}
+	}
+
+	watermarkLow *= pagesize
+
+	availMemory := ret.Free - watermarkLow
+	pageCache := retEx.ActiveFile + retEx.InactiveFile
+	pageCache -= uint64(math.Min(float64(pageCache/2), float64(watermarkLow)))
+	availMemory += pageCache
+	availMemory += ret.SReclaimable - uint64(math.Min(float64(ret.SReclaimable/2.0), float64(watermarkLow)))
+
+	return availMemory
+}

internal/gopsutil/mem/mem_openbsd.go

@@ -0,0 +1,106 @@
+//go:build openbsd
+
+package mem
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"os/exec"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func GetPageSize() (uint64, error) {
+	return GetPageSizeWithContext(context.Background())
+}
+
+func GetPageSizeWithContext(ctx context.Context) (uint64, error) {
+	uvmexp, err := unix.SysctlUvmexp("vm.uvmexp")
+	if err != nil {
+		return 0, err
+	}
+	return uint64(uvmexp.Pagesize), nil
+}
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	uvmexp, err := unix.SysctlUvmexp("vm.uvmexp")
+	if err != nil {
+		return nil, err
+	}
+	p := uint64(uvmexp.Pagesize)
+
+	ret := &VirtualMemoryStat{
+		Total:    uint64(uvmexp.Npages) * p,
+		Free:     uint64(uvmexp.Free) * p,
+		Active:   uint64(uvmexp.Active) * p,
+		Inactive: uint64(uvmexp.Inactive) * p,
+		Cached:   0, // not available
+		Wired:    uint64(uvmexp.Wired) * p,
+	}
+
+	ret.Available = ret.Inactive + ret.Cached + ret.Free
+	ret.Used = ret.Total - ret.Available
+	ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
+
+	mib := []int32{CTLVfs, VfsGeneric, VfsBcacheStat}
+	buf, length, err := common.CallSyscall(mib)
+	if err != nil {
+		return nil, err
+	}
+	if length < sizeOfBcachestats {
+		return nil, fmt.Errorf("short syscall ret %d bytes", length)
+	}
+	var bcs Bcachestats
+	br := bytes.NewReader(buf)
+	err = common.Read(br, binary.LittleEndian, &bcs)
+	if err != nil {
+		return nil, err
+	}
+	ret.Buffers = uint64(bcs.Numbufpages) * p
+
+	return ret, nil
+}
+
+// Return swapctl summary info
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	swapctl, err := exec.LookPath("swapctl")
+	if err != nil {
+		return nil, err
+	}
+
+	out, err := invoke.CommandWithContext(ctx, swapctl, "-sk")
+	if err != nil {
+		return &SwapMemoryStat{}, nil
+	}
+
+	line := string(out)
+	var total, used, free uint64
+
+	_, err = fmt.Sscanf(line,
+		"total: %d 1K-blocks allocated, %d used, %d available",
+		&total, &used, &free)
+	if err != nil {
+		return nil, errors.New("failed to parse swapctl output")
+	}
+
+	percent := float64(used) / float64(total) * 100
+	return &SwapMemoryStat{
+		Total:       total * 1024,
+		Used:        used * 1024,
+		Free:        free * 1024,
+		UsedPercent: percent,
+	}, nil
+}

internal/gopsutil/mem/mem_openbsd_386.go

@@ -0,0 +1,37 @@
+//go:build openbsd && 386
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs mem/types_openbsd.go
+
+package mem
+
+const (
+	CTLVfs        = 10
+	VfsGeneric    = 0
+	VfsBcacheStat = 3
+)
+
+const (
+	sizeOfBcachestats = 0x90
+)
+
+type Bcachestats struct {
+	Numbufs       int64
+	Numbufpages   int64
+	Numdirtypages int64
+	Numcleanpages int64
+	Pendingwrites int64
+	Pendingreads  int64
+	Numwrites     int64
+	Numreads      int64
+	Cachehits     int64
+	Busymapped    int64
+	Dmapages      int64
+	Highpages     int64
+	Delwribufs    int64
+	Kvaslots      int64
+	Avail         int64
+	Highflips     int64
+	Highflops     int64
+	Dmaflips      int64
+}

internal/gopsutil/mem/mem_openbsd_amd64.go

@@ -0,0 +1,32 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_openbsd.go
+
+package mem
+
+const (
+	CTLVfs        = 10
+	VfsGeneric    = 0
+	VfsBcacheStat = 3
+)
+
+const (
+	sizeOfBcachestats = 0x78
+)
+
+type Bcachestats struct {
+	Numbufs       int64
+	Numbufpages   int64
+	Numdirtypages int64
+	Numcleanpages int64
+	Pendingwrites int64
+	Pendingreads  int64
+	Numwrites     int64
+	Numreads      int64
+	Cachehits     int64
+	Busymapped    int64
+	Dmapages      int64
+	Highpages     int64
+	Delwribufs    int64
+	Kvaslots      int64
+	Avail         int64
+}

internal/gopsutil/mem/mem_solaris.go

@@ -0,0 +1,121 @@
+package mem
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+// VirtualMemory for Solaris is a minimal implementation which only returns
+// what Nomad needs. It does take into account global vs zone, however.
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	result := &VirtualMemoryStat{}
+
+	zoneName, err := zoneName()
+	if err != nil {
+		return nil, err
+	}
+
+	if zoneName == "global" {
+		cap, err := globalZoneMemoryCapacity()
+		if err != nil {
+			return nil, err
+		}
+		result.Total = cap
+	} else {
+		cap, err := nonGlobalZoneMemoryCapacity()
+		if err != nil {
+			return nil, err
+		}
+		result.Total = cap
+	}
+
+	return result, nil
+}
+
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func zoneName() (string, error) {
+	zonename, err := exec.LookPath("zonename")
+	if err != nil {
+		return "", err
+	}
+
+	ctx := context.Background()
+	out, err := invoke.CommandWithContext(ctx, zonename)
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(string(out)), nil
+}
+
+var globalZoneMemoryCapacityMatch = regexp.MustCompile(`memory size: ([\d]+) Megabytes`)
+
+func globalZoneMemoryCapacity() (uint64, error) {
+	prtconf, err := exec.LookPath("prtconf")
+	if err != nil {
+		return 0, err
+	}
+
+	ctx := context.Background()
+	out, err := invoke.CommandWithContext(ctx, prtconf)
+	if err != nil {
+		return 0, err
+	}
+
+	match := globalZoneMemoryCapacityMatch.FindAllStringSubmatch(string(out), -1)
+	if len(match) != 1 {
+		return 0, errors.New("memory size not contained in output of /usr/sbin/prtconf")
+	}
+
+	totalMB, err := strconv.ParseUint(match[0][1], 10, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	return totalMB * 1024 * 1024, nil
+}
+
+var kstatMatch = regexp.MustCompile(`([^\s]+)[\s]+([^\s]*)`)
+
+func nonGlobalZoneMemoryCapacity() (uint64, error) {
+	kstat, err := exec.LookPath("kstat")
+	if err != nil {
+		return 0, err
+	}
+
+	ctx := context.Background()
+	out, err := invoke.CommandWithContext(ctx, kstat, "-p", "-c", "zone_memory_cap", "memory_cap:*:*:physcap")
+	if err != nil {
+		return 0, err
+	}
+
+	kstats := kstatMatch.FindAllStringSubmatch(string(out), -1)
+	if len(kstats) != 1 {
+		return 0, fmt.Errorf("expected 1 kstat, found %d", len(kstats))
+	}
+
+	memSizeBytes, err := strconv.ParseUint(kstats[0][2], 10, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	return memSizeBytes, nil
+}

internal/gopsutil/mem/mem_windows.go

@@ -0,0 +1,99 @@
+//go:build windows
+
+package mem
+
+import (
+	"context"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	procGlobalMemoryStatusEx = common.Modkernel32.NewProc("GlobalMemoryStatusEx")
+	procGetPerformanceInfo   = common.ModPsapi.NewProc("GetPerformanceInfo")
+)
+
+type memoryStatusEx struct {
+	cbSize                  uint32
+	dwMemoryLoad            uint32
+	ullTotalPhys            uint64 // in bytes
+	ullAvailPhys            uint64
+	ullTotalPageFile        uint64
+	ullAvailPageFile        uint64
+	ullTotalVirtual         uint64
+	ullAvailVirtual         uint64
+	ullAvailExtendedVirtual uint64
+}
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	var memInfo memoryStatusEx
+	memInfo.cbSize = uint32(unsafe.Sizeof(memInfo))
+	mem, _, _ := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&memInfo)))
+	if mem == 0 {
+		return nil, windows.GetLastError()
+	}
+
+	ret := &VirtualMemoryStat{
+		Total:       memInfo.ullTotalPhys,
+		Available:   memInfo.ullAvailPhys,
+		Free:        memInfo.ullAvailPhys,
+		UsedPercent: float64(memInfo.dwMemoryLoad),
+	}
+
+	ret.Used = ret.Total - ret.Available
+	return ret, nil
+}
+
+type performanceInformation struct {
+	cb                uint32
+	commitTotal       uint64
+	commitLimit       uint64
+	commitPeak        uint64
+	physicalTotal     uint64
+	physicalAvailable uint64
+	systemCache       uint64
+	kernelTotal       uint64
+	kernelPaged       uint64
+	kernelNonpaged    uint64
+	pageSize          uint64
+	handleCount       uint32
+	processCount      uint32
+	threadCount       uint32
+}
+
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	var perfInfo performanceInformation
+	perfInfo.cb = uint32(unsafe.Sizeof(perfInfo))
+	mem, _, _ := procGetPerformanceInfo.Call(uintptr(unsafe.Pointer(&perfInfo)), uintptr(perfInfo.cb))
+	if mem == 0 {
+		return nil, windows.GetLastError()
+	}
+	tot := perfInfo.commitLimit * perfInfo.pageSize
+	used := perfInfo.commitTotal * perfInfo.pageSize
+	free := tot - used
+	var usedPercent float64
+	if tot == 0 {
+		usedPercent = 0
+	} else {
+		usedPercent = float64(used) / float64(tot) * 100
+	}
+	ret := &SwapMemoryStat{
+		Total:       tot,
+		Used:        used,
+		Free:        free,
+		UsedPercent: usedPercent,
+	}
+
+	return ret, nil
+}

internal/gopsutil/mem/types_openbsd.go

@@ -0,0 +1,28 @@
+//go:build ignore
+
+/*
+Input to cgo -godefs.
+*/
+
+package mem
+
+/*
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <sys/sysctl.h>
+*/
+import "C"
+
+// Machine characteristics; for internal use.
+
+const (
+	CTLVfs        = 10
+	VfsGeneric    = 0
+	VfsBcacheStat = 3
+)
+
+const (
+	sizeOfBcachestats = C.sizeof_struct_bcachestats
+)
+
+type Bcachestats C.struct_bcachestats

internal/gopsutil/net/net.go

@@ -0,0 +1,262 @@
+package net
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var invoke common.Invoker = common.Invoke{}
+
+type IOCountersStat struct {
+	Name        string `json:"name"`        // interface name
+	BytesSent   uint64 `json:"bytesSent"`   // number of bytes sent
+	BytesRecv   uint64 `json:"bytesRecv"`   // number of bytes received
+	PacketsSent uint64 `json:"packetsSent"` // number of packets sent
+	PacketsRecv uint64 `json:"packetsRecv"` // number of packets received
+	Errin       uint64 `json:"errin"`       // total number of errors while receiving
+	Errout      uint64 `json:"errout"`      // total number of errors while sending
+	Dropin      uint64 `json:"dropin"`      // total number of incoming packets which were dropped
+	Dropout     uint64 `json:"dropout"`     // total number of outgoing packets which were dropped (always 0 on OSX and BSD)
+	Fifoin      uint64 `json:"fifoin"`      // total number of FIFO buffers errors while receiving
+	Fifoout     uint64 `json:"fifoout"`     // total number of FIFO buffers errors while sending
+}
+
+// Addr is implemented compatibility to psutil
+type Addr struct {
+	IP   string `json:"ip"`
+	Port uint32 `json:"port"`
+}
+
+type ConnectionStat struct {
+	Fd     uint32  `json:"fd"`
+	Family uint32  `json:"family"`
+	Type   uint32  `json:"type"`
+	Laddr  Addr    `json:"localaddr"`
+	Raddr  Addr    `json:"remoteaddr"`
+	Status string  `json:"status"`
+	Uids   []int32 `json:"uids"`
+	Pid    int32   `json:"pid"`
+}
+
+// System wide stats about different network protocols
+type ProtoCountersStat struct {
+	Protocol string           `json:"protocol"`
+	Stats    map[string]int64 `json:"stats"`
+}
+
+// NetInterfaceAddr is designed for represent interface addresses
+type InterfaceAddr struct {
+	Addr string `json:"addr"`
+}
+
+type InterfaceStat struct {
+	Index        int             `json:"index"`
+	MTU          int             `json:"mtu"`          // maximum transmission unit
+	Name         string          `json:"name"`         // e.g., "en0", "lo0", "eth0.100"
+	HardwareAddr string          `json:"hardwareaddr"` // IEEE MAC-48, EUI-48 and EUI-64 form
+	Flags        []string        `json:"flags"`        // e.g., FlagUp, FlagLoopback, FlagMulticast
+	Addrs        []InterfaceAddr `json:"addrs"`
+}
+
+type FilterStat struct {
+	ConnTrackCount int64 `json:"conntrackCount"`
+	ConnTrackMax   int64 `json:"conntrackMax"`
+}
+
+// ConntrackStat has conntrack summary info
+type ConntrackStat struct {
+	Entries       uint32 `json:"entries"`        // Number of entries in the conntrack table
+	Searched      uint32 `json:"searched"`       // Number of conntrack table lookups performed
+	Found         uint32 `json:"found"`          // Number of searched entries which were successful
+	New           uint32 `json:"new"`            // Number of entries added which were not expected before
+	Invalid       uint32 `json:"invalid"`        // Number of packets seen which can not be tracked
+	Ignore        uint32 `json:"ignore"`         // Packets seen which are already connected to an entry
+	Delete        uint32 `json:"delete"`         // Number of entries which were removed
+	DeleteList    uint32 `json:"delete_list"`    // Number of entries which were put to dying list
+	Insert        uint32 `json:"insert"`         // Number of entries inserted into the list
+	InsertFailed  uint32 `json:"insert_failed"`  // # insertion attempted but failed (same entry exists)
+	Drop          uint32 `json:"drop"`           // Number of packets dropped due to conntrack failure.
+	EarlyDrop     uint32 `json:"early_drop"`     // Dropped entries to make room for new ones, if maxsize reached
+	IcmpError     uint32 `json:"icmp_error"`     // Subset of invalid. Packets that can't be tracked d/t error
+	ExpectNew     uint32 `json:"expect_new"`     // Entries added after an expectation was already present
+	ExpectCreate  uint32 `json:"expect_create"`  // Expectations added
+	ExpectDelete  uint32 `json:"expect_delete"`  // Expectations deleted
+	SearchRestart uint32 `json:"search_restart"` // Conntrack table lookups restarted due to hashtable resizes
+}
+
+func NewConntrackStat(e, s, f, n, inv, ign, del, dlst, ins, insfail, drop, edrop, ie, en, ec, ed, sr uint32) *ConntrackStat {
+	return &ConntrackStat{
+		Entries:       e,
+		Searched:      s,
+		Found:         f,
+		New:           n,
+		Invalid:       inv,
+		Ignore:        ign,
+		Delete:        del,
+		DeleteList:    dlst,
+		Insert:        ins,
+		InsertFailed:  insfail,
+		Drop:          drop,
+		EarlyDrop:     edrop,
+		IcmpError:     ie,
+		ExpectNew:     en,
+		ExpectCreate:  ec,
+		ExpectDelete:  ed,
+		SearchRestart: sr,
+	}
+}
+
+type ConntrackStatList struct {
+	items []*ConntrackStat
+}
+
+func NewConntrackStatList() *ConntrackStatList {
+	return &ConntrackStatList{
+		items: []*ConntrackStat{},
+	}
+}
+
+func (l *ConntrackStatList) Append(c *ConntrackStat) {
+	l.items = append(l.items, c)
+}
+
+func (l *ConntrackStatList) Items() []ConntrackStat {
+	items := make([]ConntrackStat, len(l.items))
+	for i, el := range l.items {
+		items[i] = *el
+	}
+	return items
+}
+
+// Summary returns a single-element list with totals from all list items.
+func (l *ConntrackStatList) Summary() []ConntrackStat {
+	summary := NewConntrackStat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+	for _, cs := range l.items {
+		summary.Entries += cs.Entries
+		summary.Searched += cs.Searched
+		summary.Found += cs.Found
+		summary.New += cs.New
+		summary.Invalid += cs.Invalid
+		summary.Ignore += cs.Ignore
+		summary.Delete += cs.Delete
+		summary.DeleteList += cs.DeleteList
+		summary.Insert += cs.Insert
+		summary.InsertFailed += cs.InsertFailed
+		summary.Drop += cs.Drop
+		summary.EarlyDrop += cs.EarlyDrop
+		summary.IcmpError += cs.IcmpError
+		summary.ExpectNew += cs.ExpectNew
+		summary.ExpectCreate += cs.ExpectCreate
+		summary.ExpectDelete += cs.ExpectDelete
+		summary.SearchRestart += cs.SearchRestart
+	}
+	return []ConntrackStat{*summary}
+}
+
+func (n IOCountersStat) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func (n ConnectionStat) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func (n ProtoCountersStat) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func (a Addr) String() string {
+	s, _ := json.Marshal(a)
+	return string(s)
+}
+
+func (n InterfaceStat) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func (n InterfaceAddr) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func (n ConntrackStat) String() string {
+	s, _ := json.Marshal(n)
+	return string(s)
+}
+
+func Interfaces() ([]InterfaceStat, error) {
+	return InterfacesWithContext(context.Background())
+}
+
+func InterfacesWithContext(ctx context.Context) ([]InterfaceStat, error) {
+	is, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]InterfaceStat, 0, len(is))
+	for _, ifi := range is {
+
+		var flags []string
+		if ifi.Flags&net.FlagUp != 0 {
+			flags = append(flags, "up")
+		}
+		if ifi.Flags&net.FlagBroadcast != 0 {
+			flags = append(flags, "broadcast")
+		}
+		if ifi.Flags&net.FlagLoopback != 0 {
+			flags = append(flags, "loopback")
+		}
+		if ifi.Flags&net.FlagPointToPoint != 0 {
+			flags = append(flags, "pointtopoint")
+		}
+		if ifi.Flags&net.FlagMulticast != 0 {
+			flags = append(flags, "multicast")
+		}
+
+		r := InterfaceStat{
+			Index:        ifi.Index,
+			Name:         ifi.Name,
+			MTU:          ifi.MTU,
+			HardwareAddr: ifi.HardwareAddr.String(),
+			Flags:        flags,
+		}
+		addrs, err := ifi.Addrs()
+		if err == nil {
+			r.Addrs = make([]InterfaceAddr, 0, len(addrs))
+			for _, addr := range addrs {
+				r.Addrs = append(r.Addrs, InterfaceAddr{
+					Addr: addr.String(),
+				})
+			}
+
+		}
+		ret = append(ret, r)
+	}
+
+	return ret, nil
+}
+
+func getIOCountersAll(n []IOCountersStat) ([]IOCountersStat, error) {
+	r := IOCountersStat{
+		Name: "all",
+	}
+	for _, nic := range n {
+		r.BytesRecv += nic.BytesRecv
+		r.PacketsRecv += nic.PacketsRecv
+		r.Errin += nic.Errin
+		r.Dropin += nic.Dropin
+		r.BytesSent += nic.BytesSent
+		r.PacketsSent += nic.PacketsSent
+		r.Errout += nic.Errout
+		r.Dropout += nic.Dropout
+	}
+
+	return []IOCountersStat{r}, nil
+}

internal/gopsutil/net/net_aix.go

@@ -0,0 +1,420 @@
+//go:build aix
+
+package net
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func parseNetstatI(output string) ([]IOCountersStat, error) {
+	lines := strings.Split(string(output), "\n")
+	ret := make([]IOCountersStat, 0, len(lines)-1)
+	exists := make([]string, 0, len(ret))
+
+	// Check first line is header
+	if len(lines) > 0 && strings.Fields(lines[0])[0] != "Name" {
+		return nil, fmt.Errorf("not a 'netstat -i' output")
+	}
+
+	for _, line := range lines[1:] {
+		values := strings.Fields(line)
+		if len(values) < 1 || values[0] == "Name" {
+			continue
+		}
+		if common.StringsHas(exists, values[0]) {
+			// skip if already get
+			continue
+		}
+		exists = append(exists, values[0])
+
+		if len(values) < 9 {
+			continue
+		}
+
+		base := 1
+		// sometimes Address is omitted
+		if len(values) < 10 {
+			base = 0
+		}
+
+		parsed := make([]uint64, 0, 5)
+		vv := []string{
+			values[base+3], // Ipkts == PacketsRecv
+			values[base+4], // Ierrs == Errin
+			values[base+5], // Opkts == PacketsSent
+			values[base+6], // Oerrs == Errout
+			values[base+8], // Drops == Dropout
+		}
+
+		for _, target := range vv {
+			if target == "-" {
+				parsed = append(parsed, 0)
+				continue
+			}
+
+			t, err := strconv.ParseUint(target, 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			parsed = append(parsed, t)
+		}
+
+		n := IOCountersStat{
+			Name:        values[0],
+			PacketsRecv: parsed[0],
+			Errin:       parsed[1],
+			PacketsSent: parsed[2],
+			Errout:      parsed[3],
+			Dropout:     parsed[4],
+		}
+		ret = append(ret, n)
+	}
+	return ret, nil
+}
+
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, netstat, "-idn")
+	if err != nil {
+		return nil, err
+	}
+
+	iocounters, err := parseNetstatI(string(out))
+	if err != nil {
+		return nil, err
+	}
+	if pernic == false {
+		return getIOCountersAll(iocounters)
+	}
+	return iocounters, nil
+}
+
+// NetIOCountersByFile is an method which is added just a compatibility for linux.
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCounters(pernic)
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func parseNetstatNetLine(line string) (ConnectionStat, error) {
+	f := strings.Fields(line)
+	if len(f) < 5 {
+		return ConnectionStat{}, fmt.Errorf("wrong line,%s", line)
+	}
+
+	var netType, netFamily uint32
+	switch f[0] {
+	case "tcp", "tcp4":
+		netType = syscall.SOCK_STREAM
+		netFamily = syscall.AF_INET
+	case "udp", "udp4":
+		netType = syscall.SOCK_DGRAM
+		netFamily = syscall.AF_INET
+	case "tcp6":
+		netType = syscall.SOCK_STREAM
+		netFamily = syscall.AF_INET6
+	case "udp6":
+		netType = syscall.SOCK_DGRAM
+		netFamily = syscall.AF_INET6
+	default:
+		return ConnectionStat{}, fmt.Errorf("unknown type, %s", f[0])
+	}
+
+	laddr, raddr, err := parseNetstatAddr(f[3], f[4], netFamily)
+	if err != nil {
+		return ConnectionStat{}, fmt.Errorf("failed to parse netaddr, %s %s", f[3], f[4])
+	}
+
+	n := ConnectionStat{
+		Fd:     uint32(0), // not supported
+		Family: uint32(netFamily),
+		Type:   uint32(netType),
+		Laddr:  laddr,
+		Raddr:  raddr,
+		Pid:    int32(0), // not supported
+	}
+	if len(f) == 6 {
+		n.Status = f[5]
+	}
+
+	return n, nil
+}
+
+var portMatch = regexp.MustCompile(`(.*)\.(\d+)$`)
+
+// This function only works for netstat returning addresses with a "."
+// before the port (0.0.0.0.22 instead of 0.0.0.0:22).
+func parseNetstatAddr(local, remote string, family uint32) (laddr, raddr Addr, err error) {
+	parse := func(l string) (Addr, error) {
+		matches := portMatch.FindStringSubmatch(l)
+		if matches == nil {
+			return Addr{}, fmt.Errorf("wrong addr, %s", l)
+		}
+		host := matches[1]
+		port := matches[2]
+		if host == "*" {
+			switch family {
+			case syscall.AF_INET:
+				host = "0.0.0.0"
+			case syscall.AF_INET6:
+				host = "::"
+			default:
+				return Addr{}, fmt.Errorf("unknown family, %d", family)
+			}
+		}
+		lport, err := strconv.Atoi(port)
+		if err != nil {
+			return Addr{}, err
+		}
+		return Addr{IP: host, Port: uint32(lport)}, nil
+	}
+
+	laddr, err = parse(local)
+	if remote != "*.*" { // remote addr exists
+		raddr, err = parse(remote)
+		if err != nil {
+			return laddr, raddr, err
+		}
+	}
+
+	return laddr, raddr, err
+}
+
+func parseNetstatUnixLine(f []string) (ConnectionStat, error) {
+	if len(f) < 8 {
+		return ConnectionStat{}, fmt.Errorf("wrong number of fields: expected >=8 got %d", len(f))
+	}
+
+	var netType uint32
+
+	switch f[1] {
+	case "dgram":
+		netType = syscall.SOCK_DGRAM
+	case "stream":
+		netType = syscall.SOCK_STREAM
+	default:
+		return ConnectionStat{}, fmt.Errorf("unknown type: %s", f[1])
+	}
+
+	// Some Unix Socket don't have any address associated
+	addr := ""
+	if len(f) == 9 {
+		addr = f[8]
+	}
+
+	c := ConnectionStat{
+		Fd:     uint32(0), // not supported
+		Family: uint32(syscall.AF_UNIX),
+		Type:   uint32(netType),
+		Laddr: Addr{
+			IP: addr,
+		},
+		Status: "NONE",
+		Pid:    int32(0), // not supported
+	}
+
+	return c, nil
+}
+
+// Return true if proto is the corresponding to the kind parameter
+// Only for Inet lines
+func hasCorrectInetProto(kind, proto string) bool {
+	switch kind {
+	case "all", "inet":
+		return true
+	case "unix":
+		return false
+	case "inet4":
+		return !strings.HasSuffix(proto, "6")
+	case "inet6":
+		return strings.HasSuffix(proto, "6")
+	case "tcp":
+		return proto == "tcp" || proto == "tcp4" || proto == "tcp6"
+	case "tcp4":
+		return proto == "tcp" || proto == "tcp4"
+	case "tcp6":
+		return proto == "tcp6"
+	case "udp":
+		return proto == "udp" || proto == "udp4" || proto == "udp6"
+	case "udp4":
+		return proto == "udp" || proto == "udp4"
+	case "udp6":
+		return proto == "udp6"
+	}
+	return false
+}
+
+func parseNetstatA(output, kind string) ([]ConnectionStat, error) {
+	var ret []ConnectionStat
+	lines := strings.Split(string(output), "\n")
+
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) < 1 {
+			continue
+		}
+
+		if strings.HasPrefix(fields[0], "f1") {
+			// Unix lines
+			if len(fields) < 2 {
+				// every unix connections have two lines
+				continue
+			}
+
+			c, err := parseNetstatUnixLine(fields)
+			if err != nil {
+				return nil, fmt.Errorf("failed to parse Unix Address (%s): %s", line, err)
+			}
+
+			ret = append(ret, c)
+
+		} else if strings.HasPrefix(fields[0], "tcp") || strings.HasPrefix(fields[0], "udp") {
+			// Inet lines
+			if !hasCorrectInetProto(kind, fields[0]) {
+				continue
+			}
+
+			// On AIX, netstat display some connections with "*.*" as local addresses
+			// Skip them as they aren't real connections.
+			if fields[3] == "*.*" {
+				continue
+			}
+
+			c, err := parseNetstatNetLine(line)
+			if err != nil {
+				return nil, fmt.Errorf("failed to parse Inet Address (%s): %s", line, err)
+			}
+
+			ret = append(ret, c)
+		} else {
+			// Header lines
+			continue
+		}
+	}
+
+	return ret, nil
+}
+
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	args := []string{"-na"}
+	switch strings.ToLower(kind) {
+	default:
+		fallthrough
+	case "":
+		kind = "all"
+	case "all":
+		// nothing to add
+	case "inet", "inet4", "inet6":
+		args = append(args, "-finet")
+	case "tcp", "tcp4", "tcp6":
+		args = append(args, "-finet")
+	case "udp", "udp4", "udp6":
+		args = append(args, "-finet")
+	case "unix":
+		args = append(args, "-funix")
+	}
+
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, netstat, args...)
+	if err != nil {
+		return nil, err
+	}
+
+	ret, err := parseNetstatA(string(out), kind)
+	if err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}
+
+func ConnectionsMax(kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithContext(context.Background(), kind, max)
+}
+
+func ConnectionsMaxWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+// Return a list of network connections opened, omitting `Uids`.
+// WithoutUids functions are reliant on implementation details. They may be altered to be an alias for Connections or be
+// removed from the API in the future.
+func ConnectionsWithoutUids(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithoutUidsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithoutUidsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithoutUidsWithContext(ctx, kind, 0)
+}
+
+func ConnectionsMaxWithoutUidsWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, 0, max)
+}
+
+func ConnectionsPidWithoutUids(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithoutUidsWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithoutUidsWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, 0)
+}
+
+func ConnectionsPidMaxWithoutUids(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max)
+}
+
+func connectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}

internal/gopsutil/net/net_darwin.go

@@ -0,0 +1,294 @@
+//go:build darwin
+
+package net
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	errNetstatHeader  = errors.New("Can't parse header of netstat output")
+	netstatLinkRegexp = regexp.MustCompile(`^<Link#(\d+)>$`)
+)
+
+const endOfLine = "\n"
+
+func parseNetstatLine(line string) (stat *IOCountersStat, linkID *uint, err error) {
+	var (
+		numericValue uint64
+		columns      = strings.Fields(line)
+	)
+
+	if columns[0] == "Name" {
+		err = errNetstatHeader
+		return
+	}
+
+	// try to extract the numeric value from <Link#123>
+	if subMatch := netstatLinkRegexp.FindStringSubmatch(columns[2]); len(subMatch) == 2 {
+		numericValue, err = strconv.ParseUint(subMatch[1], 10, 64)
+		if err != nil {
+			return
+		}
+		linkIDUint := uint(numericValue)
+		linkID = &linkIDUint
+	}
+
+	base := 1
+	numberColumns := len(columns)
+	// sometimes Address is omitted
+	if numberColumns < 12 {
+		base = 0
+	}
+	if numberColumns < 11 || numberColumns > 13 {
+		err = fmt.Errorf("Line %q do have an invalid number of columns %d", line, numberColumns)
+		return
+	}
+
+	parsed := make([]uint64, 0, 7)
+	vv := []string{
+		columns[base+3], // Ipkts == PacketsRecv
+		columns[base+4], // Ierrs == Errin
+		columns[base+5], // Ibytes == BytesRecv
+		columns[base+6], // Opkts == PacketsSent
+		columns[base+7], // Oerrs == Errout
+		columns[base+8], // Obytes == BytesSent
+	}
+	if len(columns) == 12 {
+		vv = append(vv, columns[base+10])
+	}
+
+	for _, target := range vv {
+		if target == "-" {
+			parsed = append(parsed, 0)
+			continue
+		}
+
+		if numericValue, err = strconv.ParseUint(target, 10, 64); err != nil {
+			return
+		}
+		parsed = append(parsed, numericValue)
+	}
+
+	stat = &IOCountersStat{
+		Name:        strings.Trim(columns[0], "*"), // remove the * that sometimes is on right on interface
+		PacketsRecv: parsed[0],
+		Errin:       parsed[1],
+		BytesRecv:   parsed[2],
+		PacketsSent: parsed[3],
+		Errout:      parsed[4],
+		BytesSent:   parsed[5],
+	}
+	if len(parsed) == 7 {
+		stat.Dropout = parsed[6]
+	}
+	return
+}
+
+type netstatInterface struct {
+	linkID *uint
+	stat   *IOCountersStat
+}
+
+func parseNetstatOutput(output string) ([]netstatInterface, error) {
+	var (
+		err   error
+		lines = strings.Split(strings.Trim(output, endOfLine), endOfLine)
+	)
+
+	// number of interfaces is number of lines less one for the header
+	numberInterfaces := len(lines) - 1
+
+	interfaces := make([]netstatInterface, numberInterfaces)
+	// no output beside header
+	if numberInterfaces == 0 {
+		return interfaces, nil
+	}
+
+	for index := 0; index < numberInterfaces; index++ {
+		nsIface := netstatInterface{}
+		if nsIface.stat, nsIface.linkID, err = parseNetstatLine(lines[index+1]); err != nil {
+			return nil, err
+		}
+		interfaces[index] = nsIface
+	}
+	return interfaces, nil
+}
+
+// map that hold the name of a network interface and the number of usage
+type mapInterfaceNameUsage map[string]uint
+
+func newMapInterfaceNameUsage(ifaces []netstatInterface) mapInterfaceNameUsage {
+	output := make(mapInterfaceNameUsage)
+	for index := range ifaces {
+		if ifaces[index].linkID != nil {
+			ifaceName := ifaces[index].stat.Name
+			usage, ok := output[ifaceName]
+			if ok {
+				output[ifaceName] = usage + 1
+			} else {
+				output[ifaceName] = 1
+			}
+		}
+	}
+	return output
+}
+
+func (min mapInterfaceNameUsage) isTruncated() bool {
+	for _, usage := range min {
+		if usage > 1 {
+			return true
+		}
+	}
+	return false
+}
+
+func (min mapInterfaceNameUsage) notTruncated() []string {
+	output := make([]string, 0)
+	for ifaceName, usage := range min {
+		if usage == 1 {
+			output = append(output, ifaceName)
+		}
+	}
+	return output
+}
+
+// example of `netstat -ibdnW` output on yosemite
+// Name  Mtu   Network       Address            Ipkts Ierrs     Ibytes    Opkts Oerrs     Obytes  Coll Drop
+// lo0   16384 <Link#1>                        869107     0  169411755   869107     0  169411755     0   0
+// lo0   16384 ::1/128     ::1                 869107     -  169411755   869107     -  169411755     -   -
+// lo0   16384 127           127.0.0.1         869107     -  169411755   869107     -  169411755     -   -
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	var (
+		ret      []IOCountersStat
+		retIndex int
+	)
+
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+
+	// try to get all interface metrics, and hope there won't be any truncated
+	out, err := invoke.CommandWithContext(ctx, netstat, "-ibdnW")
+	if err != nil {
+		return nil, err
+	}
+
+	nsInterfaces, err := parseNetstatOutput(string(out))
+	if err != nil {
+		return nil, err
+	}
+
+	ifaceUsage := newMapInterfaceNameUsage(nsInterfaces)
+	notTruncated := ifaceUsage.notTruncated()
+	ret = make([]IOCountersStat, len(notTruncated))
+
+	if !ifaceUsage.isTruncated() {
+		// no truncated interface name, return stats of all interface with <Link#...>
+		for index := range nsInterfaces {
+			if nsInterfaces[index].linkID != nil {
+				ret[retIndex] = *nsInterfaces[index].stat
+				retIndex++
+			}
+		}
+	} else {
+		// duplicated interface, list all interfaces
+		ifconfig, err := exec.LookPath("ifconfig")
+		if err != nil {
+			return nil, err
+		}
+		if out, err = invoke.CommandWithContext(ctx, ifconfig, "-l"); err != nil {
+			return nil, err
+		}
+		interfaceNames := strings.Fields(strings.TrimRight(string(out), endOfLine))
+
+		// for each of the interface name, run netstat if we don't have any stats yet
+		for _, interfaceName := range interfaceNames {
+			truncated := true
+			for index := range nsInterfaces {
+				if nsInterfaces[index].linkID != nil && nsInterfaces[index].stat.Name == interfaceName {
+					// handle the non truncated name to avoid execute netstat for them again
+					ret[retIndex] = *nsInterfaces[index].stat
+					retIndex++
+					truncated = false
+					break
+				}
+			}
+			if truncated {
+				// run netstat with -I$ifacename
+				if out, err = invoke.CommandWithContext(ctx, netstat, "-ibdnWI"+interfaceName); err != nil {
+					return nil, err
+				}
+				parsedIfaces, err := parseNetstatOutput(string(out))
+				if err != nil {
+					return nil, err
+				}
+				if len(parsedIfaces) == 0 {
+					// interface had been removed since `ifconfig -l` had been executed
+					continue
+				}
+				for index := range parsedIfaces {
+					if parsedIfaces[index].linkID != nil {
+						ret = append(ret, *parsedIfaces[index].stat)
+						break
+					}
+				}
+			}
+		}
+	}
+
+	if !pernic {
+		return getIOCountersAll(ret)
+	}
+	return ret, nil
+}
+
+// NetIOCountersByFile is an method which is added just a compatibility for linux.
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCounters(pernic)
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return nil, errors.New("NetFilterCounters not implemented for darwin")
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+// NetProtoCounters returns network statistics for the entire system
+// If protocols is empty then all protocols are returned, otherwise
+// just the protocols in the list are returned.
+// Not Implemented for Darwin
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return nil, errors.New("NetProtoCounters not implemented for darwin")
+}

internal/gopsutil/net/net_fallback.go

@@ -0,0 +1,92 @@
+//go:build !aix && !darwin && !linux && !freebsd && !openbsd && !windows
+
+package net
+
+import (
+	"context"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	return []IOCountersStat{}, common.ErrNotImplementedError
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return []FilterStat{}, common.ErrNotImplementedError
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return []ProtoCountersStat{}, common.ErrNotImplementedError
+}
+
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func ConnectionsMax(kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithContext(context.Background(), kind, max)
+}
+
+func ConnectionsMaxWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+// Return a list of network connections opened, omitting `Uids`.
+// WithoutUids functions are reliant on implementation details. They may be altered to be an alias for Connections or be
+// removed from the API in the future.
+func ConnectionsWithoutUids(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithoutUidsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithoutUidsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithoutUidsWithContext(ctx, kind, 0)
+}
+
+func ConnectionsMaxWithoutUidsWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, 0, max)
+}
+
+func ConnectionsPidWithoutUids(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithoutUidsWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithoutUidsWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, 0)
+}
+
+func ConnectionsPidMaxWithoutUids(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max)
+}
+
+func connectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}

internal/gopsutil/net/net_freebsd.go

@@ -0,0 +1,133 @@
+//go:build freebsd
+
+package net
+
+import (
+	"context"
+	"errors"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, netstat, "-ibdnW")
+	if err != nil {
+		return nil, err
+	}
+
+	lines := strings.Split(string(out), "\n")
+	ret := make([]IOCountersStat, 0, len(lines)-1)
+	exists := make([]string, 0, len(ret))
+
+	for _, line := range lines {
+		values := strings.Fields(line)
+		if len(values) < 1 || values[0] == "Name" {
+			continue
+		}
+		if common.StringsHas(exists, values[0]) {
+			// skip if already get
+			continue
+		}
+		exists = append(exists, values[0])
+
+		if len(values) < 12 {
+			continue
+		}
+		base := 1
+		// sometimes Address is omitted
+		if len(values) < 13 {
+			base = 0
+		}
+
+		parsed := make([]uint64, 0, 8)
+		vv := []string{
+			values[base+3],  // PacketsRecv
+			values[base+4],  // Errin
+			values[base+5],  // Dropin
+			values[base+6],  // BytesRecvn
+			values[base+7],  // PacketSent
+			values[base+8],  // Errout
+			values[base+9],  // BytesSent
+			values[base+11], // Dropout
+		}
+		for _, target := range vv {
+			if target == "-" {
+				parsed = append(parsed, 0)
+				continue
+			}
+
+			t, err := strconv.ParseUint(target, 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			parsed = append(parsed, t)
+		}
+
+		n := IOCountersStat{
+			Name:        values[0],
+			PacketsRecv: parsed[0],
+			Errin:       parsed[1],
+			Dropin:      parsed[2],
+			BytesRecv:   parsed[3],
+			PacketsSent: parsed[4],
+			Errout:      parsed[5],
+			BytesSent:   parsed[6],
+			Dropout:     parsed[7],
+		}
+		ret = append(ret, n)
+	}
+
+	if pernic == false {
+		return getIOCountersAll(ret)
+	}
+
+	return ret, nil
+}
+
+// NetIOCountersByFile is an method which is added just a compatibility for linux.
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCounters(pernic)
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return nil, errors.New("NetFilterCounters not implemented for freebsd")
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, errors.New("ConntrackStats not implemented for freebsd")
+}
+
+// NetProtoCounters returns network statistics for the entire system
+// If protocols is empty then all protocols are returned, otherwise
+// just the protocols in the list are returned.
+// Not Implemented for FreeBSD
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return nil, errors.New("NetProtoCounters not implemented for freebsd")
+}

internal/gopsutil/net/net_linux.go

@@ -0,0 +1,887 @@
+//go:build linux
+
+package net
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+const ( // Conntrack Column numbers
+	CT_ENTRIES = iota
+	CT_SEARCHED
+	CT_FOUND
+	CT_NEW
+	CT_INVALID
+	CT_IGNORE
+	CT_DELETE
+	CT_DELETE_LIST
+	CT_INSERT
+	CT_INSERT_FAILED
+	CT_DROP
+	CT_EARLY_DROP
+	CT_ICMP_ERROR
+	CT_EXPECT_NEW
+	CT_EXPECT_CREATE
+	CT_EXPECT_DELETE
+	CT_SEARCH_RESTART
+)
+
+// NetIOCounters returnes network I/O statistics for every network
+// interface installed on the system.  If pernic argument is false,
+// return only sum of all information (which name is 'all'). If true,
+// every network interface installed on the system is returned
+// separately.
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	filename := common.HostProc("net/dev")
+	return IOCountersByFileWithContext(ctx, pernic, filename)
+}
+
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	lines, err := common.ReadLines(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	parts := make([]string, 2)
+
+	statlen := len(lines) - 1
+
+	ret := make([]IOCountersStat, 0, statlen)
+
+	for _, line := range lines[2:] {
+		separatorPos := strings.LastIndex(line, ":")
+		if separatorPos == -1 {
+			continue
+		}
+		parts[0] = line[0:separatorPos]
+		parts[1] = line[separatorPos+1:]
+
+		interfaceName := strings.TrimSpace(parts[0])
+		if interfaceName == "" {
+			continue
+		}
+
+		fields := strings.Fields(strings.TrimSpace(parts[1]))
+		bytesRecv, err := strconv.ParseUint(fields[0], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		packetsRecv, err := strconv.ParseUint(fields[1], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		errIn, err := strconv.ParseUint(fields[2], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		dropIn, err := strconv.ParseUint(fields[3], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		fifoIn, err := strconv.ParseUint(fields[4], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		bytesSent, err := strconv.ParseUint(fields[8], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		packetsSent, err := strconv.ParseUint(fields[9], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		errOut, err := strconv.ParseUint(fields[10], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		dropOut, err := strconv.ParseUint(fields[11], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		fifoOut, err := strconv.ParseUint(fields[12], 10, 64)
+		if err != nil {
+			return ret, err
+		}
+
+		nic := IOCountersStat{
+			Name:        interfaceName,
+			BytesRecv:   bytesRecv,
+			PacketsRecv: packetsRecv,
+			Errin:       errIn,
+			Dropin:      dropIn,
+			Fifoin:      fifoIn,
+			BytesSent:   bytesSent,
+			PacketsSent: packetsSent,
+			Errout:      errOut,
+			Dropout:     dropOut,
+			Fifoout:     fifoOut,
+		}
+		ret = append(ret, nic)
+	}
+
+	if !pernic {
+		return getIOCountersAll(ret)
+	}
+
+	return ret, nil
+}
+
+var netProtocols = []string{
+	"ip",
+	"icmp",
+	"icmpmsg",
+	"tcp",
+	"udp",
+	"udplite",
+}
+
+// NetProtoCounters returns network statistics for the entire system
+// If protocols is empty then all protocols are returned, otherwise
+// just the protocols in the list are returned.
+// Available protocols:
+//
+//	ip,icmp,icmpmsg,tcp,udp,udplite
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	if len(protocols) == 0 {
+		protocols = netProtocols
+	}
+
+	stats := make([]ProtoCountersStat, 0, len(protocols))
+	protos := make(map[string]bool, len(protocols))
+	for _, p := range protocols {
+		protos[p] = true
+	}
+
+	filename := common.HostProc("net/snmp")
+	lines, err := common.ReadLines(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	linecount := len(lines)
+	for i := 0; i < linecount; i++ {
+		line := lines[i]
+		r := strings.IndexRune(line, ':')
+		if r == -1 {
+			return nil, errors.New(filename + " is not fomatted correctly, expected ':'.")
+		}
+		proto := strings.ToLower(line[:r])
+		if !protos[proto] {
+			// skip protocol and data line
+			i++
+			continue
+		}
+
+		// Read header line
+		statNames := strings.Split(line[r+2:], " ")
+
+		// Read data line
+		i++
+		statValues := strings.Split(lines[i][r+2:], " ")
+		if len(statNames) != len(statValues) {
+			return nil, errors.New(filename + " is not fomatted correctly, expected same number of columns.")
+		}
+		stat := ProtoCountersStat{
+			Protocol: proto,
+			Stats:    make(map[string]int64, len(statNames)),
+		}
+		for j := range statNames {
+			value, err := strconv.ParseInt(statValues[j], 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			stat.Stats[statNames[j]] = value
+		}
+		stats = append(stats, stat)
+	}
+	return stats, nil
+}
+
+// NetFilterCounters returns iptables conntrack statistics
+// the currently in use conntrack count and the max.
+// If the file does not exist or is invalid it will return nil.
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	countfile := common.HostProc("sys/net/netfilter/nf_conntrack_count")
+	maxfile := common.HostProc("sys/net/netfilter/nf_conntrack_max")
+
+	count, err := common.ReadInts(countfile)
+	if err != nil {
+		return nil, err
+	}
+	stats := make([]FilterStat, 0, 1)
+
+	max, err := common.ReadInts(maxfile)
+	if err != nil {
+		return nil, err
+	}
+
+	payload := FilterStat{
+		ConnTrackCount: count[0],
+		ConnTrackMax:   max[0],
+	}
+
+	stats = append(stats, payload)
+	return stats, nil
+}
+
+// ConntrackStats returns more detailed info about the conntrack table
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+// ConntrackStatsWithContext returns more detailed info about the conntrack table
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return conntrackStatsFromFile(common.HostProc("net/stat/nf_conntrack"), percpu)
+}
+
+// conntrackStatsFromFile returns more detailed info about the conntrack table
+// from `filename`
+// If 'percpu' is false, the result will contain exactly one item with totals/summary
+func conntrackStatsFromFile(filename string, percpu bool) ([]ConntrackStat, error) {
+	lines, err := common.ReadLines(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	statlist := NewConntrackStatList()
+
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) == 17 && fields[0] != "entries" {
+			statlist.Append(NewConntrackStat(
+				common.HexToUint32(fields[CT_ENTRIES]),
+				common.HexToUint32(fields[CT_SEARCHED]),
+				common.HexToUint32(fields[CT_FOUND]),
+				common.HexToUint32(fields[CT_NEW]),
+				common.HexToUint32(fields[CT_INVALID]),
+				common.HexToUint32(fields[CT_IGNORE]),
+				common.HexToUint32(fields[CT_DELETE]),
+				common.HexToUint32(fields[CT_DELETE_LIST]),
+				common.HexToUint32(fields[CT_INSERT]),
+				common.HexToUint32(fields[CT_INSERT_FAILED]),
+				common.HexToUint32(fields[CT_DROP]),
+				common.HexToUint32(fields[CT_EARLY_DROP]),
+				common.HexToUint32(fields[CT_ICMP_ERROR]),
+				common.HexToUint32(fields[CT_EXPECT_NEW]),
+				common.HexToUint32(fields[CT_EXPECT_CREATE]),
+				common.HexToUint32(fields[CT_EXPECT_DELETE]),
+				common.HexToUint32(fields[CT_SEARCH_RESTART]),
+			))
+		}
+	}
+
+	if percpu {
+		return statlist.Items(), nil
+	}
+	return statlist.Summary(), nil
+}
+
+// http://students.mimuw.edu.pl/lxr/source/include/net/tcp_states.h
+var TCPStatuses = map[string]string{
+	"01": "ESTABLISHED",
+	"02": "SYN_SENT",
+	"03": "SYN_RECV",
+	"04": "FIN_WAIT1",
+	"05": "FIN_WAIT2",
+	"06": "TIME_WAIT",
+	"07": "CLOSE",
+	"08": "CLOSE_WAIT",
+	"09": "LAST_ACK",
+	"0A": "LISTEN",
+	"0B": "CLOSING",
+}
+
+type netConnectionKindType struct {
+	family   uint32
+	sockType uint32
+	filename string
+}
+
+var kindTCP4 = netConnectionKindType{
+	family:   syscall.AF_INET,
+	sockType: syscall.SOCK_STREAM,
+	filename: "tcp",
+}
+
+var kindTCP6 = netConnectionKindType{
+	family:   syscall.AF_INET6,
+	sockType: syscall.SOCK_STREAM,
+	filename: "tcp6",
+}
+
+var kindUDP4 = netConnectionKindType{
+	family:   syscall.AF_INET,
+	sockType: syscall.SOCK_DGRAM,
+	filename: "udp",
+}
+
+var kindUDP6 = netConnectionKindType{
+	family:   syscall.AF_INET6,
+	sockType: syscall.SOCK_DGRAM,
+	filename: "udp6",
+}
+
+var kindUNIX = netConnectionKindType{
+	family:   syscall.AF_UNIX,
+	filename: "unix",
+}
+
+var netConnectionKindMap = map[string][]netConnectionKindType{
+	"all":   {kindTCP4, kindTCP6, kindUDP4, kindUDP6, kindUNIX},
+	"tcp":   {kindTCP4, kindTCP6},
+	"tcp4":  {kindTCP4},
+	"tcp6":  {kindTCP6},
+	"udp":   {kindUDP4, kindUDP6},
+	"udp4":  {kindUDP4},
+	"udp6":  {kindUDP6},
+	"unix":  {kindUNIX},
+	"inet":  {kindTCP4, kindTCP6, kindUDP4, kindUDP6},
+	"inet4": {kindTCP4, kindUDP4},
+	"inet6": {kindTCP6, kindUDP6},
+}
+
+type inodeMap struct {
+	pid int32
+	fd  uint32
+}
+
+type connTmp struct {
+	fd       uint32
+	family   uint32
+	sockType uint32
+	laddr    Addr
+	raddr    Addr
+	status   string
+	pid      int32
+	boundPid int32
+	path     string
+}
+
+// Return a list of network connections opened.
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsPid(kind, 0)
+}
+
+// Return a list of network connections opened returning at most `max`
+// connections for each running process.
+func ConnectionsMax(kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithContext(context.Background(), kind, max)
+}
+
+func ConnectionsMaxWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMax(kind, 0, max)
+}
+
+// Return a list of network connections opened, omitting `Uids`.
+// WithoutUids functions are reliant on implementation details. They may be altered to be an alias for Connections or be
+// removed from the API in the future.
+func ConnectionsWithoutUids(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithoutUidsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithoutUidsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithoutUidsWithContext(ctx, kind, 0)
+}
+
+func ConnectionsMaxWithoutUidsWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, 0, max)
+}
+
+// Return a list of network connections opened by a process.
+func ConnectionsPid(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithoutUids(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithoutUidsWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithContext(ctx, kind, pid, 0)
+}
+
+func ConnectionsPidWithoutUidsWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, 0)
+}
+
+// Return up to `max` network connections opened by a process.
+func ConnectionsPidMax(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithoutUids(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max, false)
+}
+
+func ConnectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max, true)
+}
+
+func connectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int, skipUids bool) ([]ConnectionStat, error) {
+	tmap, ok := netConnectionKindMap[kind]
+	if !ok {
+		return nil, fmt.Errorf("invalid kind, %s", kind)
+	}
+	root := common.HostProc()
+	var err error
+	var inodes map[string][]inodeMap
+	if pid == 0 {
+		inodes, err = getProcInodesAll(root, max)
+	} else {
+		inodes, err = getProcInodes(root, pid, max)
+		if len(inodes) == 0 {
+			// no connection for the pid
+			return []ConnectionStat{}, nil
+		}
+	}
+	if err != nil {
+		return nil, fmt.Errorf("cound not get pid(s), %d: %s", pid, err)
+	}
+	return statsFromInodes(root, pid, tmap, inodes, skipUids)
+}
+
+func statsFromInodes(root string, pid int32, tmap []netConnectionKindType, inodes map[string][]inodeMap, skipUids bool) ([]ConnectionStat, error) {
+	dupCheckMap := make(map[string]struct{})
+	var ret []ConnectionStat
+
+	var err error
+	for _, t := range tmap {
+		var path string
+		var connKey string
+		var ls []connTmp
+		if pid == 0 {
+			path = fmt.Sprintf("%s/net/%s", root, t.filename)
+		} else {
+			path = fmt.Sprintf("%s/%d/net/%s", root, pid, t.filename)
+		}
+		switch t.family {
+		case syscall.AF_INET, syscall.AF_INET6:
+			ls, err = processInet(path, t, inodes, pid)
+		case syscall.AF_UNIX:
+			ls, err = processUnix(path, t, inodes, pid)
+		}
+		if err != nil {
+			return nil, err
+		}
+		for _, c := range ls {
+			// Build TCP key to id the connection uniquely
+			// socket type, src ip, src port, dst ip, dst port and state should be enough
+			// to prevent duplications.
+			connKey = fmt.Sprintf("%d-%s:%d-%s:%d-%s", c.sockType, c.laddr.IP, c.laddr.Port, c.raddr.IP, c.raddr.Port, c.status)
+			if _, ok := dupCheckMap[connKey]; ok {
+				continue
+			}
+
+			conn := ConnectionStat{
+				Fd:     c.fd,
+				Family: c.family,
+				Type:   c.sockType,
+				Laddr:  c.laddr,
+				Raddr:  c.raddr,
+				Status: c.status,
+				Pid:    c.pid,
+			}
+			if c.pid == 0 {
+				conn.Pid = c.boundPid
+			} else {
+				conn.Pid = c.pid
+			}
+
+			if !skipUids {
+				// fetch process owner Real, effective, saved set, and filesystem UIDs
+				proc := process{Pid: conn.Pid}
+				conn.Uids, _ = proc.getUids()
+			}
+
+			ret = append(ret, conn)
+			dupCheckMap[connKey] = struct{}{}
+		}
+
+	}
+
+	return ret, nil
+}
+
+// getProcInodes returnes fd of the pid.
+func getProcInodes(root string, pid int32, max int) (map[string][]inodeMap, error) {
+	ret := make(map[string][]inodeMap)
+
+	dir := fmt.Sprintf("%s/%d/fd", root, pid)
+	f, err := os.Open(dir)
+	if err != nil {
+		return ret, err
+	}
+	defer f.Close()
+	files, err := f.Readdir(max)
+	if err != nil {
+		return ret, err
+	}
+	for _, fd := range files {
+		inodePath := fmt.Sprintf("%s/%d/fd/%s", root, pid, fd.Name())
+
+		inode, err := os.Readlink(inodePath)
+		if err != nil {
+			continue
+		}
+		if !strings.HasPrefix(inode, "socket:[") {
+			continue
+		}
+		// the process is using a socket
+		l := len(inode)
+		inode = inode[8 : l-1]
+		_, ok := ret[inode]
+		if !ok {
+			ret[inode] = make([]inodeMap, 0)
+		}
+		fd, err := strconv.Atoi(fd.Name())
+		if err != nil {
+			continue
+		}
+
+		i := inodeMap{
+			pid: pid,
+			fd:  uint32(fd),
+		}
+		ret[inode] = append(ret[inode], i)
+	}
+	return ret, nil
+}
+
+// Pids retunres all pids.
+// Note: this is a copy of process_linux.Pids()
+// FIXME: Import process occures import cycle.
+// move to common made other platform breaking. Need consider.
+func Pids() ([]int32, error) {
+	return PidsWithContext(context.Background())
+}
+
+func PidsWithContext(ctx context.Context) ([]int32, error) {
+	var ret []int32
+
+	d, err := os.Open(common.HostProc())
+	if err != nil {
+		return nil, err
+	}
+	defer d.Close()
+
+	fnames, err := d.Readdirnames(-1)
+	if err != nil {
+		return nil, err
+	}
+	for _, fname := range fnames {
+		pid, err := strconv.ParseInt(fname, 10, 32)
+		if err != nil {
+			// if not numeric name, just skip
+			continue
+		}
+		ret = append(ret, int32(pid))
+	}
+
+	return ret, nil
+}
+
+// Note: the following is based off process_linux structs and methods
+// we need these to fetch the owner of a process ID
+// FIXME: Import process occures import cycle.
+// see remarks on pids()
+type process struct {
+	Pid  int32 `json:"pid"`
+	uids []int32
+}
+
+// Uids returns user ids of the process as a slice of the int
+func (p *process) getUids() ([]int32, error) {
+	err := p.fillFromStatus()
+	if err != nil {
+		return []int32{}, err
+	}
+	return p.uids, nil
+}
+
+// Get status from /proc/(pid)/status
+func (p *process) fillFromStatus() error {
+	pid := p.Pid
+	statPath := common.HostProc(strconv.Itoa(int(pid)), "status")
+	contents, err := os.ReadFile(statPath)
+	if err != nil {
+		return err
+	}
+	lines := strings.Split(string(contents), "\n")
+	for _, line := range lines {
+		tabParts := strings.SplitN(line, "\t", 2)
+		if len(tabParts) < 2 {
+			continue
+		}
+		value := tabParts[1]
+		switch strings.TrimRight(tabParts[0], ":") {
+		case "Uid":
+			p.uids = make([]int32, 0, 4)
+			for _, i := range strings.Split(value, "\t") {
+				v, err := strconv.ParseInt(i, 10, 32)
+				if err != nil {
+					return err
+				}
+				p.uids = append(p.uids, int32(v))
+			}
+		}
+	}
+	return nil
+}
+
+func getProcInodesAll(root string, max int) (map[string][]inodeMap, error) {
+	pids, err := Pids()
+	if err != nil {
+		return nil, err
+	}
+	ret := make(map[string][]inodeMap)
+
+	for _, pid := range pids {
+		t, err := getProcInodes(root, pid, max)
+		if err != nil {
+			// skip if permission error or no longer exists
+			if os.IsPermission(err) || errors.Is(err, fs.ErrNotExist) || err == io.EOF {
+				continue
+			}
+			return ret, err
+		}
+		if len(t) == 0 {
+			continue
+		}
+		// TODO: update ret.
+		ret = updateMap(ret, t)
+	}
+	return ret, nil
+}
+
+// decodeAddress decode addresse represents addr in proc/net/*
+// ex:
+// "0500000A:0016" -> "10.0.0.5", 22
+// "0085002452100113070057A13F025401:0035" -> "2400:8500:1301:1052:a157:7:154:23f", 53
+func decodeAddress(family uint32, src string) (Addr, error) {
+	t := strings.Split(src, ":")
+	if len(t) != 2 {
+		return Addr{}, fmt.Errorf("does not contain port, %s", src)
+	}
+	addr := t[0]
+	port, err := strconv.ParseUint(t[1], 16, 16)
+	if err != nil {
+		return Addr{}, fmt.Errorf("invalid port, %s", src)
+	}
+	decoded, err := hex.DecodeString(addr)
+	if err != nil {
+		return Addr{}, fmt.Errorf("decode error, %s", err)
+	}
+	var ip net.IP
+	// Assumes this is little_endian
+	if family == syscall.AF_INET {
+		ip = net.IP(Reverse(decoded))
+	} else { // IPv6
+		ip, err = parseIPv6HexString(decoded)
+		if err != nil {
+			return Addr{}, err
+		}
+	}
+	return Addr{
+		IP:   ip.String(),
+		Port: uint32(port),
+	}, nil
+}
+
+// Reverse reverses array of bytes.
+func Reverse(s []byte) []byte {
+	return ReverseWithContext(context.Background(), s)
+}
+
+func ReverseWithContext(ctx context.Context, s []byte) []byte {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
+		s[i], s[j] = s[j], s[i]
+	}
+	return s
+}
+
+// parseIPv6HexString parse array of bytes to IPv6 string
+func parseIPv6HexString(src []byte) (net.IP, error) {
+	if len(src) != 16 {
+		return nil, fmt.Errorf("invalid IPv6 string")
+	}
+
+	buf := make([]byte, 0, 16)
+	for i := 0; i < len(src); i += 4 {
+		r := Reverse(src[i : i+4])
+		buf = append(buf, r...)
+	}
+	return net.IP(buf), nil
+}
+
+func processInet(file string, kind netConnectionKindType, inodes map[string][]inodeMap, filterPid int32) ([]connTmp, error) {
+	if strings.HasSuffix(file, "6") && !common.PathExists(file) {
+		// IPv6 not supported, return empty.
+		return []connTmp{}, nil
+	}
+
+	// Read the contents of the /proc file with a single read sys call.
+	// This minimizes duplicates in the returned connections
+	// For more info:
+	// https://github.com/shirou/gopsutil/pull/361
+	contents, err := os.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+
+	lines := bytes.Split(contents, []byte("\n"))
+
+	var ret []connTmp
+	// skip first line
+	for _, line := range lines[1:] {
+		l := strings.Fields(string(line))
+		if len(l) < 10 {
+			continue
+		}
+		laddr := l[1]
+		raddr := l[2]
+		status := l[3]
+		inode := l[9]
+		pid := int32(0)
+		fd := uint32(0)
+		i, exists := inodes[inode]
+		if exists {
+			pid = i[0].pid
+			fd = i[0].fd
+		}
+		if filterPid > 0 && filterPid != pid {
+			continue
+		}
+		if kind.sockType == syscall.SOCK_STREAM {
+			status = TCPStatuses[status]
+		} else {
+			status = "NONE"
+		}
+		la, err := decodeAddress(kind.family, laddr)
+		if err != nil {
+			continue
+		}
+		ra, err := decodeAddress(kind.family, raddr)
+		if err != nil {
+			continue
+		}
+
+		ret = append(ret, connTmp{
+			fd:       fd,
+			family:   kind.family,
+			sockType: kind.sockType,
+			laddr:    la,
+			raddr:    ra,
+			status:   status,
+			pid:      pid,
+		})
+	}
+
+	return ret, nil
+}
+
+func processUnix(file string, kind netConnectionKindType, inodes map[string][]inodeMap, filterPid int32) ([]connTmp, error) {
+	// Read the contents of the /proc file with a single read sys call.
+	// This minimizes duplicates in the returned connections
+	// For more info:
+	// https://github.com/shirou/gopsutil/pull/361
+	contents, err := os.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+
+	lines := bytes.Split(contents, []byte("\n"))
+
+	var ret []connTmp
+	// skip first line
+	for _, line := range lines[1:] {
+		tokens := strings.Fields(string(line))
+		if len(tokens) < 6 {
+			continue
+		}
+		st, err := strconv.Atoi(tokens[4])
+		if err != nil {
+			return nil, err
+		}
+
+		inode := tokens[6]
+
+		var pairs []inodeMap
+		pairs, exists := inodes[inode]
+		if !exists {
+			pairs = []inodeMap{
+				{},
+			}
+		}
+		for _, pair := range pairs {
+			if filterPid > 0 && filterPid != pair.pid {
+				continue
+			}
+			var path string
+			if len(tokens) == 8 {
+				path = tokens[len(tokens)-1]
+			}
+			ret = append(ret, connTmp{
+				fd:       pair.fd,
+				family:   kind.family,
+				sockType: uint32(st),
+				laddr: Addr{
+					IP: path,
+				},
+				pid:    pair.pid,
+				status: "NONE",
+				path:   path,
+			})
+		}
+	}
+
+	return ret, nil
+}
+
+func updateMap(src, add map[string][]inodeMap) map[string][]inodeMap {
+	for key, value := range add {
+		a, exists := src[key]
+		if !exists {
+			src[key] = value
+			continue
+		}
+		src[key] = append(a, value...)
+	}
+	return src
+}

internal/gopsutil/net/net_openbsd.go

@@ -0,0 +1,320 @@
+//go:build openbsd
+
+package net
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var portMatch = regexp.MustCompile(`(.*)\.(\d+)$`)
+
+func ParseNetstat(output, mode string,
+	iocs map[string]IOCountersStat,
+) error {
+	lines := strings.Split(output, "\n")
+
+	exists := make([]string, 0, len(lines)-1)
+
+	columns := 6
+	if mode == "ind" {
+		columns = 10
+	}
+	for _, line := range lines {
+		values := strings.Fields(line)
+		if len(values) < 1 || values[0] == "Name" {
+			continue
+		}
+		if common.StringsHas(exists, values[0]) {
+			// skip if already get
+			continue
+		}
+
+		if len(values) < columns {
+			continue
+		}
+		base := 1
+		// sometimes Address is omitted
+		if len(values) < columns {
+			base = 0
+		}
+
+		parsed := make([]uint64, 0, 8)
+		var vv []string
+		if mode == "inb" {
+			vv = []string{
+				values[base+3], // BytesRecv
+				values[base+4], // BytesSent
+			}
+		} else {
+			vv = []string{
+				values[base+3], // Ipkts
+				values[base+4], // Ierrs
+				values[base+5], // Opkts
+				values[base+6], // Oerrs
+				values[base+8], // Drops
+			}
+		}
+		for _, target := range vv {
+			if target == "-" {
+				parsed = append(parsed, 0)
+				continue
+			}
+
+			t, err := strconv.ParseUint(target, 10, 64)
+			if err != nil {
+				return err
+			}
+			parsed = append(parsed, t)
+		}
+		exists = append(exists, values[0])
+
+		n, present := iocs[values[0]]
+		if !present {
+			n = IOCountersStat{Name: values[0]}
+		}
+		if mode == "inb" {
+			n.BytesRecv = parsed[0]
+			n.BytesSent = parsed[1]
+		} else {
+			n.PacketsRecv = parsed[0]
+			n.Errin = parsed[1]
+			n.PacketsSent = parsed[2]
+			n.Errout = parsed[3]
+			n.Dropin = parsed[4]
+			n.Dropout = parsed[4]
+		}
+
+		iocs[n.Name] = n
+	}
+	return nil
+}
+
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, netstat, "-inb")
+	if err != nil {
+		return nil, err
+	}
+	out2, err := invoke.CommandWithContext(ctx, netstat, "-ind")
+	if err != nil {
+		return nil, err
+	}
+	iocs := make(map[string]IOCountersStat)
+
+	lines := strings.Split(string(out), "\n")
+	ret := make([]IOCountersStat, 0, len(lines)-1)
+
+	err = ParseNetstat(string(out), "inb", iocs)
+	if err != nil {
+		return nil, err
+	}
+	err = ParseNetstat(string(out2), "ind", iocs)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ioc := range iocs {
+		ret = append(ret, ioc)
+	}
+
+	if pernic == false {
+		return getIOCountersAll(ret)
+	}
+
+	return ret, nil
+}
+
+// NetIOCountersByFile is an method which is added just a compatibility for linux.
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCounters(pernic)
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return nil, errors.New("NetFilterCounters not implemented for openbsd")
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+// NetProtoCounters returns network statistics for the entire system
+// If protocols is empty then all protocols are returned, otherwise
+// just the protocols in the list are returned.
+// Not Implemented for OpenBSD
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return nil, errors.New("NetProtoCounters not implemented for openbsd")
+}
+
+func parseNetstatLine(line string) (ConnectionStat, error) {
+	f := strings.Fields(line)
+	if len(f) < 5 {
+		return ConnectionStat{}, fmt.Errorf("wrong line,%s", line)
+	}
+
+	var netType, netFamily uint32
+	switch f[0] {
+	case "tcp":
+		netType = syscall.SOCK_STREAM
+		netFamily = syscall.AF_INET
+	case "udp":
+		netType = syscall.SOCK_DGRAM
+		netFamily = syscall.AF_INET
+	case "tcp6":
+		netType = syscall.SOCK_STREAM
+		netFamily = syscall.AF_INET6
+	case "udp6":
+		netType = syscall.SOCK_DGRAM
+		netFamily = syscall.AF_INET6
+	default:
+		return ConnectionStat{}, fmt.Errorf("unknown type, %s", f[0])
+	}
+
+	laddr, raddr, err := parseNetstatAddr(f[3], f[4], netFamily)
+	if err != nil {
+		return ConnectionStat{}, fmt.Errorf("failed to parse netaddr, %s %s", f[3], f[4])
+	}
+
+	n := ConnectionStat{
+		Fd:     uint32(0), // not supported
+		Family: uint32(netFamily),
+		Type:   uint32(netType),
+		Laddr:  laddr,
+		Raddr:  raddr,
+		Pid:    int32(0), // not supported
+	}
+	if len(f) == 6 {
+		n.Status = f[5]
+	}
+
+	return n, nil
+}
+
+func parseNetstatAddr(local, remote string, family uint32) (laddr, raddr Addr, err error) {
+	parse := func(l string) (Addr, error) {
+		matches := portMatch.FindStringSubmatch(l)
+		if matches == nil {
+			return Addr{}, fmt.Errorf("wrong addr, %s", l)
+		}
+		host := matches[1]
+		port := matches[2]
+		if host == "*" {
+			switch family {
+			case syscall.AF_INET:
+				host = "0.0.0.0"
+			case syscall.AF_INET6:
+				host = "::"
+			default:
+				return Addr{}, fmt.Errorf("unknown family, %d", family)
+			}
+		}
+		lport, err := strconv.Atoi(port)
+		if err != nil {
+			return Addr{}, err
+		}
+		return Addr{IP: host, Port: uint32(lport)}, nil
+	}
+
+	laddr, err = parse(local)
+	if remote != "*.*" { // remote addr exists
+		raddr, err = parse(remote)
+		if err != nil {
+			return laddr, raddr, err
+		}
+	}
+
+	return laddr, raddr, err
+}
+
+// Return a list of network connections opened.
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	var ret []ConnectionStat
+
+	args := []string{"-na"}
+	switch strings.ToLower(kind) {
+	default:
+		fallthrough
+	case "":
+		fallthrough
+	case "all":
+		fallthrough
+	case "inet":
+		// nothing to add
+	case "inet4":
+		args = append(args, "-finet")
+	case "inet6":
+		args = append(args, "-finet6")
+	case "tcp":
+		args = append(args, "-ptcp")
+	case "tcp4":
+		args = append(args, "-ptcp", "-finet")
+	case "tcp6":
+		args = append(args, "-ptcp", "-finet6")
+	case "udp":
+		args = append(args, "-pudp")
+	case "udp4":
+		args = append(args, "-pudp", "-finet")
+	case "udp6":
+		args = append(args, "-pudp", "-finet6")
+	case "unix":
+		return ret, common.ErrNotImplementedError
+	}
+
+	netstat, err := exec.LookPath("netstat")
+	if err != nil {
+		return nil, err
+	}
+	out, err := invoke.CommandWithContext(ctx, netstat, args...)
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(out), "\n")
+	for _, line := range lines {
+		if !(strings.HasPrefix(line, "tcp") || strings.HasPrefix(line, "udp")) {
+			continue
+		}
+		n, err := parseNetstatLine(line)
+		if err != nil {
+			continue
+		}
+
+		ret = append(ret, n)
+	}
+
+	return ret, nil
+}

internal/gopsutil/net/net_unix.go

@@ -0,0 +1,223 @@
+//go:build freebsd || darwin
+
+package net
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+// Return a list of network connections opened.
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsPid(kind, 0)
+}
+
+// Return a list of network connections opened returning at most `max`
+// connections for each running process.
+func ConnectionsMax(kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithContext(context.Background(), kind, max)
+}
+
+func ConnectionsMaxWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+// Return a list of network connections opened by a process.
+func ConnectionsPid(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	var ret []ConnectionStat
+
+	args := []string{"-i"}
+	switch strings.ToLower(kind) {
+	default:
+		fallthrough
+	case "":
+		fallthrough
+	case "all":
+		fallthrough
+	case "inet":
+		args = append(args, "tcp", "-i", "udp")
+	case "inet4":
+		args = append(args, "4")
+	case "inet6":
+		args = append(args, "6")
+	case "tcp":
+		args = append(args, "tcp")
+	case "tcp4":
+		args = append(args, "4tcp")
+	case "tcp6":
+		args = append(args, "6tcp")
+	case "udp":
+		args = append(args, "udp")
+	case "udp4":
+		args = append(args, "6udp")
+	case "udp6":
+		args = append(args, "6udp")
+	case "unix":
+		args = []string{"-U"}
+	}
+
+	r, err := common.CallLsofWithContext(ctx, invoke, pid, args...)
+	if err != nil {
+		return nil, err
+	}
+	for _, rr := range r {
+		if strings.HasPrefix(rr, "COMMAND") {
+			continue
+		}
+		n, err := parseNetLine(rr)
+		if err != nil {
+			continue
+		}
+
+		ret = append(ret, n)
+	}
+
+	return ret, nil
+}
+
+var constMap = map[string]int{
+	"unix": syscall.AF_UNIX,
+	"TCP":  syscall.SOCK_STREAM,
+	"UDP":  syscall.SOCK_DGRAM,
+	"IPv4": syscall.AF_INET,
+	"IPv6": syscall.AF_INET6,
+}
+
+func parseNetLine(line string) (ConnectionStat, error) {
+	f := strings.Fields(line)
+	if len(f) < 8 {
+		return ConnectionStat{}, fmt.Errorf("wrong line,%s", line)
+	}
+
+	if len(f) == 8 {
+		f = append(f, f[7])
+		f[7] = "unix"
+	}
+
+	pid, err := strconv.Atoi(f[1])
+	if err != nil {
+		return ConnectionStat{}, err
+	}
+	fd, err := strconv.Atoi(strings.Trim(f[3], "u"))
+	if err != nil {
+		return ConnectionStat{}, fmt.Errorf("unknown fd, %s", f[3])
+	}
+	netFamily, ok := constMap[f[4]]
+	if !ok {
+		return ConnectionStat{}, fmt.Errorf("unknown family, %s", f[4])
+	}
+	netType, ok := constMap[f[7]]
+	if !ok {
+		return ConnectionStat{}, fmt.Errorf("unknown type, %s", f[7])
+	}
+
+	var laddr, raddr Addr
+	if f[7] == "unix" {
+		laddr.IP = f[8]
+	} else {
+		laddr, raddr, err = parseNetAddr(f[8])
+		if err != nil {
+			return ConnectionStat{}, fmt.Errorf("failed to parse netaddr, %s", f[8])
+		}
+	}
+
+	n := ConnectionStat{
+		Fd:     uint32(fd),
+		Family: uint32(netFamily),
+		Type:   uint32(netType),
+		Laddr:  laddr,
+		Raddr:  raddr,
+		Pid:    int32(pid),
+	}
+	if len(f) == 10 {
+		n.Status = strings.Trim(f[9], "()")
+	}
+
+	return n, nil
+}
+
+func parseNetAddr(line string) (laddr, raddr Addr, err error) {
+	parse := func(l string) (Addr, error) {
+		host, port, err := net.SplitHostPort(l)
+		if err != nil {
+			return Addr{}, fmt.Errorf("wrong addr, %s", l)
+		}
+		lport, err := strconv.Atoi(port)
+		if err != nil {
+			return Addr{}, err
+		}
+		return Addr{IP: host, Port: uint32(lport)}, nil
+	}
+
+	addrs := strings.Split(line, "->")
+	if len(addrs) == 0 {
+		return laddr, raddr, fmt.Errorf("wrong netaddr, %s", line)
+	}
+	laddr, err = parse(addrs[0])
+	if len(addrs) == 2 { // remote addr exists
+		raddr, err = parse(addrs[1])
+		if err != nil {
+			return laddr, raddr, err
+		}
+	}
+
+	return laddr, raddr, err
+}
+
+// Return up to `max` network connections opened by a process.
+func ConnectionsPidMax(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+// Return a list of network connections opened, omitting `Uids`.
+// WithoutUids functions are reliant on implementation details. They may be altered to be an alias for Connections or be
+// removed from the API in the future.
+func ConnectionsWithoutUids(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithoutUidsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithoutUidsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithoutUidsWithContext(ctx, kind, 0)
+}
+
+func ConnectionsMaxWithoutUidsWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, 0, max)
+}
+
+func ConnectionsPidWithoutUids(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithoutUidsWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithoutUidsWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, 0)
+}
+
+func ConnectionsPidMaxWithoutUids(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max)
+}
+
+func connectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}

internal/gopsutil/net/net_windows.go

@@ -0,0 +1,779 @@
+//go:build windows
+
+package net
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	modiphlpapi             = windows.NewLazySystemDLL("iphlpapi.dll")
+	procGetExtendedTCPTable = modiphlpapi.NewProc("GetExtendedTcpTable")
+	procGetExtendedUDPTable = modiphlpapi.NewProc("GetExtendedUdpTable")
+	procGetIfEntry2         = modiphlpapi.NewProc("GetIfEntry2")
+)
+
+const (
+	TCPTableBasicListener = iota
+	TCPTableBasicConnections
+	TCPTableBasicAll
+	TCPTableOwnerPIDListener
+	TCPTableOwnerPIDConnections
+	TCPTableOwnerPIDAll
+	TCPTableOwnerModuleListener
+	TCPTableOwnerModuleConnections
+	TCPTableOwnerModuleAll
+)
+
+type netConnectionKindType struct {
+	family   uint32
+	sockType uint32
+	filename string
+}
+
+var kindTCP4 = netConnectionKindType{
+	family:   syscall.AF_INET,
+	sockType: syscall.SOCK_STREAM,
+	filename: "tcp",
+}
+
+var kindTCP6 = netConnectionKindType{
+	family:   syscall.AF_INET6,
+	sockType: syscall.SOCK_STREAM,
+	filename: "tcp6",
+}
+
+var kindUDP4 = netConnectionKindType{
+	family:   syscall.AF_INET,
+	sockType: syscall.SOCK_DGRAM,
+	filename: "udp",
+}
+
+var kindUDP6 = netConnectionKindType{
+	family:   syscall.AF_INET6,
+	sockType: syscall.SOCK_DGRAM,
+	filename: "udp6",
+}
+
+var netConnectionKindMap = map[string][]netConnectionKindType{
+	"all":   {kindTCP4, kindTCP6, kindUDP4, kindUDP6},
+	"tcp":   {kindTCP4, kindTCP6},
+	"tcp4":  {kindTCP4},
+	"tcp6":  {kindTCP6},
+	"udp":   {kindUDP4, kindUDP6},
+	"udp4":  {kindUDP4},
+	"udp6":  {kindUDP6},
+	"inet":  {kindTCP4, kindTCP6, kindUDP4, kindUDP6},
+	"inet4": {kindTCP4, kindUDP4},
+	"inet6": {kindTCP6, kindUDP6},
+}
+
+// https://github.com/microsoft/ethr/blob/aecdaf923970e5a9b4c461b4e2e3963d781ad2cc/plt_windows.go#L114-L170
+type guid struct {
+	Data1 uint32
+	Data2 uint16
+	Data3 uint16
+	Data4 [8]byte
+}
+
+const (
+	maxStringSize        = 256
+	maxPhysAddressLength = 32
+	pad0for64_4for32     = 0
+)
+
+type mibIfRow2 struct {
+	InterfaceLuid               uint64
+	InterfaceIndex              uint32
+	InterfaceGuid               guid
+	Alias                       [maxStringSize + 1]uint16
+	Description                 [maxStringSize + 1]uint16
+	PhysicalAddressLength       uint32
+	PhysicalAddress             [maxPhysAddressLength]uint8
+	PermanentPhysicalAddress    [maxPhysAddressLength]uint8
+	Mtu                         uint32
+	Type                        uint32
+	TunnelType                  uint32
+	MediaType                   uint32
+	PhysicalMediumType          uint32
+	AccessType                  uint32
+	DirectionType               uint32
+	InterfaceAndOperStatusFlags uint32
+	OperStatus                  uint32
+	AdminStatus                 uint32
+	MediaConnectState           uint32
+	NetworkGuid                 guid
+	ConnectionType              uint32
+	padding1                    [pad0for64_4for32]byte
+	TransmitLinkSpeed           uint64
+	ReceiveLinkSpeed            uint64
+	InOctets                    uint64
+	InUcastPkts                 uint64
+	InNUcastPkts                uint64
+	InDiscards                  uint64
+	InErrors                    uint64
+	InUnknownProtos             uint64
+	InUcastOctets               uint64
+	InMulticastOctets           uint64
+	InBroadcastOctets           uint64
+	OutOctets                   uint64
+	OutUcastPkts                uint64
+	OutNUcastPkts               uint64
+	OutDiscards                 uint64
+	OutErrors                   uint64
+	OutUcastOctets              uint64
+	OutMulticastOctets          uint64
+	OutBroadcastOctets          uint64
+	OutQLen                     uint64
+}
+
+func IOCounters(pernic bool) ([]IOCountersStat, error) {
+	return IOCountersWithContext(context.Background(), pernic)
+}
+
+func IOCountersWithContext(ctx context.Context, pernic bool) ([]IOCountersStat, error) {
+	ifs, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	var counters []IOCountersStat
+
+	err = procGetIfEntry2.Find()
+	if err == nil { // Vista+, uint64 values (issue#693)
+		for _, ifi := range ifs {
+			c := IOCountersStat{
+				Name: ifi.Name,
+			}
+
+			row := mibIfRow2{InterfaceIndex: uint32(ifi.Index)}
+			ret, _, err := procGetIfEntry2.Call(uintptr(unsafe.Pointer(&row)))
+			if ret != 0 {
+				return nil, os.NewSyscallError("GetIfEntry2", err)
+			}
+			c.BytesSent = uint64(row.OutOctets)
+			c.BytesRecv = uint64(row.InOctets)
+			c.PacketsSent = uint64(row.OutUcastPkts)
+			c.PacketsRecv = uint64(row.InUcastPkts)
+			c.Errin = uint64(row.InErrors)
+			c.Errout = uint64(row.OutErrors)
+			c.Dropin = uint64(row.InDiscards)
+			c.Dropout = uint64(row.OutDiscards)
+
+			counters = append(counters, c)
+		}
+	} else { // WinXP fallback, uint32 values
+		for _, ifi := range ifs {
+			c := IOCountersStat{
+				Name: ifi.Name,
+			}
+
+			row := windows.MibIfRow{Index: uint32(ifi.Index)}
+			err = windows.GetIfEntry(&row)
+			if err != nil {
+				return nil, os.NewSyscallError("GetIfEntry", err)
+			}
+			c.BytesSent = uint64(row.OutOctets)
+			c.BytesRecv = uint64(row.InOctets)
+			c.PacketsSent = uint64(row.OutUcastPkts)
+			c.PacketsRecv = uint64(row.InUcastPkts)
+			c.Errin = uint64(row.InErrors)
+			c.Errout = uint64(row.OutErrors)
+			c.Dropin = uint64(row.InDiscards)
+			c.Dropout = uint64(row.OutDiscards)
+
+			counters = append(counters, c)
+		}
+	}
+
+	if !pernic {
+		return getIOCountersAll(counters)
+	}
+	return counters, nil
+}
+
+// NetIOCountersByFile is an method which is added just a compatibility for linux.
+func IOCountersByFile(pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCountersByFileWithContext(context.Background(), pernic, filename)
+}
+
+func IOCountersByFileWithContext(ctx context.Context, pernic bool, filename string) ([]IOCountersStat, error) {
+	return IOCounters(pernic)
+}
+
+// Return a list of network connections
+// Available kind:
+//
+//	reference to netConnectionKindMap
+func Connections(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsPidWithContext(ctx, kind, 0)
+}
+
+// ConnectionsPid Return a list of network connections opened by a process
+func ConnectionsPid(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	tmap, ok := netConnectionKindMap[kind]
+	if !ok {
+		return nil, fmt.Errorf("invalid kind, %s", kind)
+	}
+	return getProcInet(tmap, pid)
+}
+
+func getProcInet(kinds []netConnectionKindType, pid int32) ([]ConnectionStat, error) {
+	stats := make([]ConnectionStat, 0)
+
+	for _, kind := range kinds {
+		s, err := getNetStatWithKind(kind)
+		if err != nil {
+			continue
+		}
+
+		if pid == 0 {
+			stats = append(stats, s...)
+		} else {
+			for _, ns := range s {
+				if ns.Pid != pid {
+					continue
+				}
+				stats = append(stats, ns)
+			}
+		}
+	}
+
+	return stats, nil
+}
+
+func getNetStatWithKind(kindType netConnectionKindType) ([]ConnectionStat, error) {
+	if kindType.filename == "" {
+		return nil, fmt.Errorf("kind filename must be required")
+	}
+
+	switch kindType.filename {
+	case kindTCP4.filename:
+		return getTCPConnections(kindTCP4.family)
+	case kindTCP6.filename:
+		return getTCPConnections(kindTCP6.family)
+	case kindUDP4.filename:
+		return getUDPConnections(kindUDP4.family)
+	case kindUDP6.filename:
+		return getUDPConnections(kindUDP6.family)
+	}
+
+	return nil, fmt.Errorf("invalid kind filename, %s", kindType.filename)
+}
+
+// Return a list of network connections opened returning at most `max`
+// connections for each running process.
+func ConnectionsMax(kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithContext(context.Background(), kind, max)
+}
+
+func ConnectionsMaxWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+// Return a list of network connections opened, omitting `Uids`.
+// WithoutUids functions are reliant on implementation details. They may be altered to be an alias for Connections or be
+// removed from the API in the future.
+func ConnectionsWithoutUids(kind string) ([]ConnectionStat, error) {
+	return ConnectionsWithoutUidsWithContext(context.Background(), kind)
+}
+
+func ConnectionsWithoutUidsWithContext(ctx context.Context, kind string) ([]ConnectionStat, error) {
+	return ConnectionsMaxWithoutUidsWithContext(ctx, kind, 0)
+}
+
+func ConnectionsMaxWithoutUidsWithContext(ctx context.Context, kind string, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, 0, max)
+}
+
+func ConnectionsPidWithoutUids(kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidWithoutUidsWithContext(context.Background(), kind, pid)
+}
+
+func ConnectionsPidWithoutUidsWithContext(ctx context.Context, kind string, pid int32) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, 0)
+}
+
+func ConnectionsPidMaxWithoutUids(kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return ConnectionsPidMaxWithoutUidsWithContext(context.Background(), kind, pid, max)
+}
+
+func ConnectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return connectionsPidMaxWithoutUidsWithContext(ctx, kind, pid, max)
+}
+
+func connectionsPidMaxWithoutUidsWithContext(ctx context.Context, kind string, pid int32, max int) ([]ConnectionStat, error) {
+	return []ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func FilterCounters() ([]FilterStat, error) {
+	return FilterCountersWithContext(context.Background())
+}
+
+func FilterCountersWithContext(ctx context.Context) ([]FilterStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func ConntrackStats(percpu bool) ([]ConntrackStat, error) {
+	return ConntrackStatsWithContext(context.Background(), percpu)
+}
+
+func ConntrackStatsWithContext(ctx context.Context, percpu bool) ([]ConntrackStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+// NetProtoCounters returns network statistics for the entire system
+// If protocols is empty then all protocols are returned, otherwise
+// just the protocols in the list are returned.
+// Not Implemented for Windows
+func ProtoCounters(protocols []string) ([]ProtoCountersStat, error) {
+	return ProtoCountersWithContext(context.Background(), protocols)
+}
+
+func ProtoCountersWithContext(ctx context.Context, protocols []string) ([]ProtoCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func getTableUintptr(family uint32, buf []byte) uintptr {
+	var (
+		pmibTCPTable  pmibTCPTableOwnerPidAll
+		pmibTCP6Table pmibTCP6TableOwnerPidAll
+
+		p uintptr
+	)
+	switch family {
+	case kindTCP4.family:
+		if len(buf) > 0 {
+			pmibTCPTable = (*mibTCPTableOwnerPid)(unsafe.Pointer(&buf[0]))
+			p = uintptr(unsafe.Pointer(pmibTCPTable))
+		} else {
+			p = uintptr(unsafe.Pointer(pmibTCPTable))
+		}
+	case kindTCP6.family:
+		if len(buf) > 0 {
+			pmibTCP6Table = (*mibTCP6TableOwnerPid)(unsafe.Pointer(&buf[0]))
+			p = uintptr(unsafe.Pointer(pmibTCP6Table))
+		} else {
+			p = uintptr(unsafe.Pointer(pmibTCP6Table))
+		}
+	}
+	return p
+}
+
+func getTableInfo(filename string, table interface{}) (index, step, length int) {
+	switch filename {
+	case kindTCP4.filename:
+		index = int(unsafe.Sizeof(table.(pmibTCPTableOwnerPidAll).DwNumEntries))
+		step = int(unsafe.Sizeof(table.(pmibTCPTableOwnerPidAll).Table))
+		length = int(table.(pmibTCPTableOwnerPidAll).DwNumEntries)
+	case kindTCP6.filename:
+		index = int(unsafe.Sizeof(table.(pmibTCP6TableOwnerPidAll).DwNumEntries))
+		step = int(unsafe.Sizeof(table.(pmibTCP6TableOwnerPidAll).Table))
+		length = int(table.(pmibTCP6TableOwnerPidAll).DwNumEntries)
+	case kindUDP4.filename:
+		index = int(unsafe.Sizeof(table.(pmibUDPTableOwnerPid).DwNumEntries))
+		step = int(unsafe.Sizeof(table.(pmibUDPTableOwnerPid).Table))
+		length = int(table.(pmibUDPTableOwnerPid).DwNumEntries)
+	case kindUDP6.filename:
+		index = int(unsafe.Sizeof(table.(pmibUDP6TableOwnerPid).DwNumEntries))
+		step = int(unsafe.Sizeof(table.(pmibUDP6TableOwnerPid).Table))
+		length = int(table.(pmibUDP6TableOwnerPid).DwNumEntries)
+	}
+
+	return
+}
+
+func getTCPConnections(family uint32) ([]ConnectionStat, error) {
+	var (
+		p    uintptr
+		buf  []byte
+		size uint32
+
+		pmibTCPTable  pmibTCPTableOwnerPidAll
+		pmibTCP6Table pmibTCP6TableOwnerPidAll
+	)
+
+	if family == 0 {
+		return nil, fmt.Errorf("faimly must be required")
+	}
+
+	for {
+		switch family {
+		case kindTCP4.family:
+			if len(buf) > 0 {
+				pmibTCPTable = (*mibTCPTableOwnerPid)(unsafe.Pointer(&buf[0]))
+				p = uintptr(unsafe.Pointer(pmibTCPTable))
+			} else {
+				p = uintptr(unsafe.Pointer(pmibTCPTable))
+			}
+		case kindTCP6.family:
+			if len(buf) > 0 {
+				pmibTCP6Table = (*mibTCP6TableOwnerPid)(unsafe.Pointer(&buf[0]))
+				p = uintptr(unsafe.Pointer(pmibTCP6Table))
+			} else {
+				p = uintptr(unsafe.Pointer(pmibTCP6Table))
+			}
+		}
+
+		err := getExtendedTcpTable(p,
+			&size,
+			true,
+			family,
+			tcpTableOwnerPidAll,
+			0)
+		if err == nil {
+			break
+		}
+		if err != windows.ERROR_INSUFFICIENT_BUFFER {
+			return nil, err
+		}
+		buf = make([]byte, size)
+	}
+
+	var (
+		index, step int
+		length      int
+	)
+
+	stats := make([]ConnectionStat, 0)
+	switch family {
+	case kindTCP4.family:
+		index, step, length = getTableInfo(kindTCP4.filename, pmibTCPTable)
+	case kindTCP6.family:
+		index, step, length = getTableInfo(kindTCP6.filename, pmibTCP6Table)
+	}
+
+	if length == 0 {
+		return nil, nil
+	}
+
+	for i := 0; i < length; i++ {
+		switch family {
+		case kindTCP4.family:
+			mibs := (*mibTCPRowOwnerPid)(unsafe.Pointer(&buf[index]))
+			ns := mibs.convertToConnectionStat()
+			stats = append(stats, ns)
+		case kindTCP6.family:
+			mibs := (*mibTCP6RowOwnerPid)(unsafe.Pointer(&buf[index]))
+			ns := mibs.convertToConnectionStat()
+			stats = append(stats, ns)
+		}
+
+		index += step
+	}
+	return stats, nil
+}
+
+func getUDPConnections(family uint32) ([]ConnectionStat, error) {
+	var (
+		p    uintptr
+		buf  []byte
+		size uint32
+
+		pmibUDPTable  pmibUDPTableOwnerPid
+		pmibUDP6Table pmibUDP6TableOwnerPid
+	)
+
+	if family == 0 {
+		return nil, fmt.Errorf("faimly must be required")
+	}
+
+	for {
+		switch family {
+		case kindUDP4.family:
+			if len(buf) > 0 {
+				pmibUDPTable = (*mibUDPTableOwnerPid)(unsafe.Pointer(&buf[0]))
+				p = uintptr(unsafe.Pointer(pmibUDPTable))
+			} else {
+				p = uintptr(unsafe.Pointer(pmibUDPTable))
+			}
+		case kindUDP6.family:
+			if len(buf) > 0 {
+				pmibUDP6Table = (*mibUDP6TableOwnerPid)(unsafe.Pointer(&buf[0]))
+				p = uintptr(unsafe.Pointer(pmibUDP6Table))
+			} else {
+				p = uintptr(unsafe.Pointer(pmibUDP6Table))
+			}
+		}
+
+		err := getExtendedUdpTable(
+			p,
+			&size,
+			true,
+			family,
+			udpTableOwnerPid,
+			0,
+		)
+		if err == nil {
+			break
+		}
+		if err != windows.ERROR_INSUFFICIENT_BUFFER {
+			return nil, err
+		}
+		buf = make([]byte, size)
+	}
+
+	var index, step, length int
+
+	stats := make([]ConnectionStat, 0)
+	switch family {
+	case kindUDP4.family:
+		index, step, length = getTableInfo(kindUDP4.filename, pmibUDPTable)
+	case kindUDP6.family:
+		index, step, length = getTableInfo(kindUDP6.filename, pmibUDP6Table)
+	}
+
+	if length == 0 {
+		return nil, nil
+	}
+
+	for i := 0; i < length; i++ {
+		switch family {
+		case kindUDP4.family:
+			mibs := (*mibUDPRowOwnerPid)(unsafe.Pointer(&buf[index]))
+			ns := mibs.convertToConnectionStat()
+			stats = append(stats, ns)
+		case kindUDP4.family:
+			mibs := (*mibUDP6RowOwnerPid)(unsafe.Pointer(&buf[index]))
+			ns := mibs.convertToConnectionStat()
+			stats = append(stats, ns)
+		}
+
+		index += step
+	}
+	return stats, nil
+}
+
+// tcpStatuses https://msdn.microsoft.com/en-us/library/windows/desktop/bb485761(v=vs.85).aspx
+var tcpStatuses = map[mibTCPState]string{
+	1:  "CLOSED",
+	2:  "LISTEN",
+	3:  "SYN_SENT",
+	4:  "SYN_RECEIVED",
+	5:  "ESTABLISHED",
+	6:  "FIN_WAIT_1",
+	7:  "FIN_WAIT_2",
+	8:  "CLOSE_WAIT",
+	9:  "CLOSING",
+	10: "LAST_ACK",
+	11: "TIME_WAIT",
+	12: "DELETE",
+}
+
+func getExtendedTcpTable(pTcpTable uintptr, pdwSize *uint32, bOrder bool, ulAf uint32, tableClass tcpTableClass, reserved uint32) (errcode error) {
+	r1, _, _ := syscall.Syscall6(procGetExtendedTCPTable.Addr(), 6, pTcpTable, uintptr(unsafe.Pointer(pdwSize)), getUintptrFromBool(bOrder), uintptr(ulAf), uintptr(tableClass), uintptr(reserved))
+	if r1 != 0 {
+		errcode = syscall.Errno(r1)
+	}
+	return
+}
+
+func getExtendedUdpTable(pUdpTable uintptr, pdwSize *uint32, bOrder bool, ulAf uint32, tableClass udpTableClass, reserved uint32) (errcode error) {
+	r1, _, _ := syscall.Syscall6(procGetExtendedUDPTable.Addr(), 6, pUdpTable, uintptr(unsafe.Pointer(pdwSize)), getUintptrFromBool(bOrder), uintptr(ulAf), uintptr(tableClass), uintptr(reserved))
+	if r1 != 0 {
+		errcode = syscall.Errno(r1)
+	}
+	return
+}
+
+func getUintptrFromBool(b bool) uintptr {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+const anySize = 1
+
+// type MIB_TCP_STATE int32
+type mibTCPState int32
+
+type tcpTableClass int32
+
+const (
+	tcpTableBasicListener tcpTableClass = iota
+	tcpTableBasicConnections
+	tcpTableBasicAll
+	tcpTableOwnerPidListener
+	tcpTableOwnerPidConnections
+	tcpTableOwnerPidAll
+	tcpTableOwnerModuleListener
+	tcpTableOwnerModuleConnections
+	tcpTableOwnerModuleAll
+)
+
+type udpTableClass int32
+
+const (
+	udpTableBasic udpTableClass = iota
+	udpTableOwnerPid
+	udpTableOwnerModule
+)
+
+// TCP
+
+type mibTCPRowOwnerPid struct {
+	DwState      uint32
+	DwLocalAddr  uint32
+	DwLocalPort  uint32
+	DwRemoteAddr uint32
+	DwRemotePort uint32
+	DwOwningPid  uint32
+}
+
+func (m *mibTCPRowOwnerPid) convertToConnectionStat() ConnectionStat {
+	ns := ConnectionStat{
+		Family: kindTCP4.family,
+		Type:   kindTCP4.sockType,
+		Laddr: Addr{
+			IP:   parseIPv4HexString(m.DwLocalAddr),
+			Port: uint32(decodePort(m.DwLocalPort)),
+		},
+		Raddr: Addr{
+			IP:   parseIPv4HexString(m.DwRemoteAddr),
+			Port: uint32(decodePort(m.DwRemotePort)),
+		},
+		Pid:    int32(m.DwOwningPid),
+		Status: tcpStatuses[mibTCPState(m.DwState)],
+	}
+
+	return ns
+}
+
+type mibTCPTableOwnerPid struct {
+	DwNumEntries uint32
+	Table        [anySize]mibTCPRowOwnerPid
+}
+
+type mibTCP6RowOwnerPid struct {
+	UcLocalAddr     [16]byte
+	DwLocalScopeId  uint32
+	DwLocalPort     uint32
+	UcRemoteAddr    [16]byte
+	DwRemoteScopeId uint32
+	DwRemotePort    uint32
+	DwState         uint32
+	DwOwningPid     uint32
+}
+
+func (m *mibTCP6RowOwnerPid) convertToConnectionStat() ConnectionStat {
+	ns := ConnectionStat{
+		Family: kindTCP6.family,
+		Type:   kindTCP6.sockType,
+		Laddr: Addr{
+			IP:   parseIPv6HexString(m.UcLocalAddr),
+			Port: uint32(decodePort(m.DwLocalPort)),
+		},
+		Raddr: Addr{
+			IP:   parseIPv6HexString(m.UcRemoteAddr),
+			Port: uint32(decodePort(m.DwRemotePort)),
+		},
+		Pid:    int32(m.DwOwningPid),
+		Status: tcpStatuses[mibTCPState(m.DwState)],
+	}
+
+	return ns
+}
+
+type mibTCP6TableOwnerPid struct {
+	DwNumEntries uint32
+	Table        [anySize]mibTCP6RowOwnerPid
+}
+
+type (
+	pmibTCPTableOwnerPidAll  *mibTCPTableOwnerPid
+	pmibTCP6TableOwnerPidAll *mibTCP6TableOwnerPid
+)
+
+// UDP
+
+type mibUDPRowOwnerPid struct {
+	DwLocalAddr uint32
+	DwLocalPort uint32
+	DwOwningPid uint32
+}
+
+func (m *mibUDPRowOwnerPid) convertToConnectionStat() ConnectionStat {
+	ns := ConnectionStat{
+		Family: kindUDP4.family,
+		Type:   kindUDP4.sockType,
+		Laddr: Addr{
+			IP:   parseIPv4HexString(m.DwLocalAddr),
+			Port: uint32(decodePort(m.DwLocalPort)),
+		},
+		Pid: int32(m.DwOwningPid),
+	}
+
+	return ns
+}
+
+type mibUDPTableOwnerPid struct {
+	DwNumEntries uint32
+	Table        [anySize]mibUDPRowOwnerPid
+}
+
+type mibUDP6RowOwnerPid struct {
+	UcLocalAddr    [16]byte
+	DwLocalScopeId uint32
+	DwLocalPort    uint32
+	DwOwningPid    uint32
+}
+
+func (m *mibUDP6RowOwnerPid) convertToConnectionStat() ConnectionStat {
+	ns := ConnectionStat{
+		Family: kindUDP6.family,
+		Type:   kindUDP6.sockType,
+		Laddr: Addr{
+			IP:   parseIPv6HexString(m.UcLocalAddr),
+			Port: uint32(decodePort(m.DwLocalPort)),
+		},
+		Pid: int32(m.DwOwningPid),
+	}
+
+	return ns
+}
+
+type mibUDP6TableOwnerPid struct {
+	DwNumEntries uint32
+	Table        [anySize]mibUDP6RowOwnerPid
+}
+
+type (
+	pmibUDPTableOwnerPid  *mibUDPTableOwnerPid
+	pmibUDP6TableOwnerPid *mibUDP6TableOwnerPid
+)
+
+func decodePort(port uint32) uint16 {
+	return syscall.Ntohs(uint16(port))
+}
+
+func parseIPv4HexString(addr uint32) string {
+	return fmt.Sprintf("%d.%d.%d.%d", addr&255, addr>>8&255, addr>>16&255, addr>>24&255)
+}
+
+func parseIPv6HexString(addr [16]byte) string {
+	var ret [16]byte
+	for i := 0; i < 16; i++ {
+		ret[i] = uint8(addr[i])
+	}
+
+	// convert []byte to net.IP
+	ip := net.IP(ret[:])
+	return ip.String()
+}

internal/gopsutil/process/process.go

@@ -0,0 +1,322 @@
+package process
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"runtime"
+	"sort"
+	"time"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/cpu"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/mem"
+)
+
+var (
+	invoke                 common.Invoker = common.Invoke{}
+	ErrorNoChildren                       = errors.New("process does not have children")
+	ErrorProcessNotRunning                = errors.New("process does not exist")
+)
+
+type Process struct {
+	Pid            int32 `json:"pid"`
+	name           string
+	status         string
+	parent         int32
+	numCtxSwitches *NumCtxSwitchesStat
+	uids           []int32
+	gids           []int32
+	groups         []int32
+	numThreads     int32
+	memInfo        *MemoryInfoStat
+	sigInfo        *SignalInfoStat
+	createTime     int64
+
+	lastCPUTimes *cpu.TimesStat
+	lastCPUTime  time.Time
+
+	tgid int32
+}
+
+type OpenFilesStat struct {
+	Path string `json:"path"`
+	Fd   uint64 `json:"fd"`
+}
+
+type MemoryInfoStat struct {
+	RSS    uint64 `json:"rss"`    // bytes
+	VMS    uint64 `json:"vms"`    // bytes
+	HWM    uint64 `json:"hwm"`    // bytes
+	Data   uint64 `json:"data"`   // bytes
+	Stack  uint64 `json:"stack"`  // bytes
+	Locked uint64 `json:"locked"` // bytes
+	Swap   uint64 `json:"swap"`   // bytes
+}
+
+type SignalInfoStat struct {
+	PendingProcess uint64 `json:"pending_process"`
+	PendingThread  uint64 `json:"pending_thread"`
+	Blocked        uint64 `json:"blocked"`
+	Ignored        uint64 `json:"ignored"`
+	Caught         uint64 `json:"caught"`
+}
+
+type RlimitStat struct {
+	Resource int32  `json:"resource"`
+	Soft     int32  `json:"soft"` // TODO too small. needs to be uint64
+	Hard     int32  `json:"hard"` // TODO too small. needs to be uint64
+	Used     uint64 `json:"used"`
+}
+
+type IOCountersStat struct {
+	ReadCount  uint64 `json:"readCount"`
+	WriteCount uint64 `json:"writeCount"`
+	ReadBytes  uint64 `json:"readBytes"`
+	WriteBytes uint64 `json:"writeBytes"`
+}
+
+type NumCtxSwitchesStat struct {
+	Voluntary   int64 `json:"voluntary"`
+	Involuntary int64 `json:"involuntary"`
+}
+
+type PageFaultsStat struct {
+	MinorFaults      uint64 `json:"minorFaults"`
+	MajorFaults      uint64 `json:"majorFaults"`
+	ChildMinorFaults uint64 `json:"childMinorFaults"`
+	ChildMajorFaults uint64 `json:"childMajorFaults"`
+}
+
+// Resource limit constants are from /usr/include/x86_64-linux-gnu/bits/resource.h
+// from libc6-dev package in Ubuntu 16.10
+const (
+	RLIMIT_CPU        int32 = 0
+	RLIMIT_FSIZE      int32 = 1
+	RLIMIT_DATA       int32 = 2
+	RLIMIT_STACK      int32 = 3
+	RLIMIT_CORE       int32 = 4
+	RLIMIT_RSS        int32 = 5
+	RLIMIT_NPROC      int32 = 6
+	RLIMIT_NOFILE     int32 = 7
+	RLIMIT_MEMLOCK    int32 = 8
+	RLIMIT_AS         int32 = 9
+	RLIMIT_LOCKS      int32 = 10
+	RLIMIT_SIGPENDING int32 = 11
+	RLIMIT_MSGQUEUE   int32 = 12
+	RLIMIT_NICE       int32 = 13
+	RLIMIT_RTPRIO     int32 = 14
+	RLIMIT_RTTIME     int32 = 15
+)
+
+func (p Process) String() string {
+	s, _ := json.Marshal(p)
+	return string(s)
+}
+
+func (o OpenFilesStat) String() string {
+	s, _ := json.Marshal(o)
+	return string(s)
+}
+
+func (m MemoryInfoStat) String() string {
+	s, _ := json.Marshal(m)
+	return string(s)
+}
+
+func (r RlimitStat) String() string {
+	s, _ := json.Marshal(r)
+	return string(s)
+}
+
+func (i IOCountersStat) String() string {
+	s, _ := json.Marshal(i)
+	return string(s)
+}
+
+func (p NumCtxSwitchesStat) String() string {
+	s, _ := json.Marshal(p)
+	return string(s)
+}
+
+// Pids returns a slice of process ID list which are running now.
+func Pids() ([]int32, error) {
+	return PidsWithContext(context.Background())
+}
+
+func PidsWithContext(ctx context.Context) ([]int32, error) {
+	pids, err := pidsWithContext(ctx)
+	sort.Slice(pids, func(i, j int) bool { return pids[i] < pids[j] })
+	return pids, err
+}
+
+// NewProcess creates a new Process instance, it only stores the pid and
+// checks that the process exists. Other method on Process can be used
+// to get more information about the process. An error will be returned
+// if the process does not exist.
+func NewProcess(pid int32) (*Process, error) {
+	p := &Process{Pid: pid}
+
+	exists, err := PidExists(pid)
+	if err != nil {
+		return p, err
+	}
+	if !exists {
+		return p, ErrorProcessNotRunning
+	}
+	_, err = p.CreateTime()
+	return p, err
+}
+
+func PidExists(pid int32) (bool, error) {
+	return PidExistsWithContext(context.Background(), pid)
+}
+
+// Background returns true if the process is in background, false otherwise.
+func (p *Process) Background() (bool, error) {
+	return p.BackgroundWithContext(context.Background())
+}
+
+func (p *Process) BackgroundWithContext(ctx context.Context) (bool, error) {
+	fg, err := p.ForegroundWithContext(ctx)
+	if err != nil {
+		return false, err
+	}
+	return !fg, err
+}
+
+// If interval is 0, return difference from last call(non-blocking).
+// If interval > 0, wait interval sec and return diffrence between start and end.
+func (p *Process) Percent(interval time.Duration) (float64, error) {
+	return p.PercentWithContext(context.Background(), interval)
+}
+
+func (p *Process) PercentWithContext(ctx context.Context, interval time.Duration) (float64, error) {
+	cpuTimes, err := p.Times()
+	if err != nil {
+		return 0, err
+	}
+	now := time.Now()
+
+	if interval > 0 {
+		p.lastCPUTimes = cpuTimes
+		p.lastCPUTime = now
+		if err := common.Sleep(ctx, interval); err != nil {
+			return 0, err
+		}
+		cpuTimes, err = p.Times()
+		now = time.Now()
+		if err != nil {
+			return 0, err
+		}
+	} else {
+		if p.lastCPUTimes == nil {
+			// invoked first time
+			p.lastCPUTimes = cpuTimes
+			p.lastCPUTime = now
+			return 0, nil
+		}
+	}
+
+	numcpu := runtime.NumCPU()
+	delta := (now.Sub(p.lastCPUTime).Seconds()) * float64(numcpu)
+	ret := calculatePercent(p.lastCPUTimes, cpuTimes, delta, numcpu)
+	p.lastCPUTimes = cpuTimes
+	p.lastCPUTime = now
+	return ret, nil
+}
+
+// IsRunning returns whether the process is still running or not.
+func (p *Process) IsRunning() (bool, error) {
+	return p.IsRunningWithContext(context.Background())
+}
+
+func (p *Process) IsRunningWithContext(ctx context.Context) (bool, error) {
+	createTime, err := p.CreateTimeWithContext(ctx)
+	if err != nil {
+		return false, err
+	}
+	p2, err := NewProcess(p.Pid)
+	if err == ErrorProcessNotRunning {
+		return false, nil
+	}
+	createTime2, err := p2.CreateTimeWithContext(ctx)
+	if err != nil {
+		return false, err
+	}
+	return createTime == createTime2, nil
+}
+
+// CreateTime returns created time of the process in milliseconds since the epoch, in UTC.
+func (p *Process) CreateTime() (int64, error) {
+	return p.CreateTimeWithContext(context.Background())
+}
+
+func (p *Process) CreateTimeWithContext(ctx context.Context) (int64, error) {
+	if p.createTime != 0 {
+		return p.createTime, nil
+	}
+	createTime, err := p.createTimeWithContext(ctx)
+	p.createTime = createTime
+	return p.createTime, err
+}
+
+func calculatePercent(t1, t2 *cpu.TimesStat, delta float64, numcpu int) float64 {
+	if delta == 0 {
+		return 0
+	}
+	delta_proc := t2.Total() - t1.Total()
+	overall_percent := ((delta_proc / delta) * 100) * float64(numcpu)
+	return overall_percent
+}
+
+// MemoryPercent returns how many percent of the total RAM this process uses
+func (p *Process) MemoryPercent() (float32, error) {
+	return p.MemoryPercentWithContext(context.Background())
+}
+
+func (p *Process) MemoryPercentWithContext(ctx context.Context) (float32, error) {
+	machineMemory, err := mem.VirtualMemory()
+	if err != nil {
+		return 0, err
+	}
+	total := machineMemory.Total
+
+	processMemory, err := p.MemoryInfo()
+	if err != nil {
+		return 0, err
+	}
+	used := processMemory.RSS
+
+	return (100 * float32(used) / float32(total)), nil
+}
+
+// CPU_Percent returns how many percent of the CPU time this process uses
+func (p *Process) CPUPercent() (float64, error) {
+	return p.CPUPercentWithContext(context.Background())
+}
+
+func (p *Process) CPUPercentWithContext(ctx context.Context) (float64, error) {
+	crt_time, err := p.CreateTime()
+	if err != nil {
+		return 0, err
+	}
+
+	cput, err := p.Times()
+	if err != nil {
+		return 0, err
+	}
+
+	created := time.Unix(0, crt_time*int64(time.Millisecond))
+	totalTime := time.Since(created).Seconds()
+	if totalTime <= 0 {
+		return 0, nil
+	}
+
+	return 100 * cput.Total() / totalTime, nil
+}
+
+// Groups returns all group IDs(include supplementary groups) of the process as a slice of the int
+func (p *Process) Groups() ([]int32, error) {
+	return p.GroupsWithContext(context.Background())
+}

internal/gopsutil/process/process_darwin.go

@@ -0,0 +1,689 @@
+//go:build darwin
+
+package process
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/cpu"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/net"
+)
+
+// copied from sys/sysctl.h
+const (
+	CTLKern          = 1  // "high kernel": proc, limits
+	KernProc         = 14 // struct: process entries
+	KernProcPID      = 1  // by process id
+	KernProcProc     = 8  // only return procs
+	KernProcAll      = 0  // everything
+	KernProcPathname = 12 // path to executable
+)
+
+const (
+	ClockTicks = 100 // C.sysconf(C._SC_CLK_TCK)
+)
+
+type _Ctype_struct___0 struct {
+	Pad uint64
+}
+
+// MemoryInfoExStat is different between OSes
+type MemoryInfoExStat struct{}
+
+type MemoryMapsStat struct{}
+
+func pidsWithContext(ctx context.Context) ([]int32, error) {
+	var ret []int32
+
+	pids, err := callPsWithContext(ctx, "pid", 0, false)
+	if err != nil {
+		return ret, err
+	}
+
+	for _, pid := range pids {
+		v, err := strconv.Atoi(pid[0])
+		if err != nil {
+			return ret, err
+		}
+		ret = append(ret, int32(v))
+	}
+
+	return ret, nil
+}
+
+func (p *Process) Ppid() (int32, error) {
+	return p.PpidWithContext(context.Background())
+}
+
+func (p *Process) PpidWithContext(ctx context.Context) (int32, error) {
+	r, err := callPsWithContext(ctx, "ppid", p.Pid, false)
+	if err != nil {
+		return 0, err
+	}
+
+	v, err := strconv.Atoi(r[0][0])
+	if err != nil {
+		return 0, err
+	}
+
+	return int32(v), err
+}
+
+func (p *Process) Name() (string, error) {
+	return p.NameWithContext(context.Background())
+}
+
+func (p *Process) NameWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+	name := common.IntToString(k.Proc.P_comm[:])
+
+	if len(name) >= 15 {
+		cmdlineSlice, err := p.CmdlineSliceWithContext(ctx)
+		if err != nil {
+			return "", err
+		}
+		if len(cmdlineSlice) > 0 {
+			extendedName := filepath.Base(cmdlineSlice[0])
+			if strings.HasPrefix(extendedName, p.name) {
+				name = extendedName
+			} else {
+				name = cmdlineSlice[0]
+			}
+		}
+	}
+
+	return name, nil
+}
+
+func (p *Process) Tgid() (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Exe() (string, error) {
+	return p.ExeWithContext(context.Background())
+}
+
+// Cmdline returns the command line arguments of the process as a string with
+// each argument separated by 0x20 ascii character.
+func (p *Process) Cmdline() (string, error) {
+	return p.CmdlineWithContext(context.Background())
+}
+
+func (p *Process) CmdlineWithContext(ctx context.Context) (string, error) {
+	r, err := callPsWithContext(ctx, "command", p.Pid, false)
+	if err != nil {
+		return "", err
+	}
+	return strings.Join(r[0], " "), err
+}
+
+// CmdlineSlice returns the command line arguments of the process as a slice with each
+// element being an argument. Because of current deficiencies in the way that the command
+// line arguments are found, single arguments that have spaces in the will actually be
+// reported as two separate items. In order to do something better CGO would be needed
+// to use the native darwin functions.
+func (p *Process) CmdlineSlice() ([]string, error) {
+	return p.CmdlineSliceWithContext(context.Background())
+}
+
+func (p *Process) CmdlineSliceWithContext(ctx context.Context) ([]string, error) {
+	r, err := callPsWithContext(ctx, "command", p.Pid, false)
+	if err != nil {
+		return nil, err
+	}
+	return r[0], err
+}
+
+func (p *Process) createTimeWithContext(ctx context.Context) (int64, error) {
+	r, err := callPsWithContext(ctx, "etime", p.Pid, false)
+	if err != nil {
+		return 0, err
+	}
+
+	elapsedSegments := strings.Split(strings.Replace(r[0][0], "-", ":", 1), ":")
+	var elapsedDurations []time.Duration
+	for i := len(elapsedSegments) - 1; i >= 0; i-- {
+		p, err := strconv.ParseInt(elapsedSegments[i], 10, 0)
+		if err != nil {
+			return 0, err
+		}
+		elapsedDurations = append(elapsedDurations, time.Duration(p))
+	}
+
+	elapsed := time.Duration(elapsedDurations[0]) * time.Second
+	if len(elapsedDurations) > 1 {
+		elapsed += time.Duration(elapsedDurations[1]) * time.Minute
+	}
+	if len(elapsedDurations) > 2 {
+		elapsed += time.Duration(elapsedDurations[2]) * time.Hour
+	}
+	if len(elapsedDurations) > 3 {
+		elapsed += time.Duration(elapsedDurations[3]) * time.Hour * 24
+	}
+
+	start := time.Now().Add(-elapsed)
+	return start.Unix() * 1000, nil
+}
+
+func (p *Process) Cwd() (string, error) {
+	return p.CwdWithContext(context.Background())
+}
+
+func (p *Process) CwdWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Parent() (*Process, error) {
+	return p.ParentWithContext(context.Background())
+}
+
+func (p *Process) ParentWithContext(ctx context.Context) (*Process, error) {
+	rr, err := common.CallLsofWithContext(ctx, invoke, p.Pid, "-FR")
+	if err != nil {
+		return nil, err
+	}
+	for _, r := range rr {
+		if strings.HasPrefix(r, "p") { // skip if process
+			continue
+		}
+		l := string(r)
+		v, err := strconv.Atoi(strings.Replace(l, "R", "", 1))
+		if err != nil {
+			return nil, err
+		}
+		return NewProcess(int32(v))
+	}
+	return nil, fmt.Errorf("could not find parent line")
+}
+
+func (p *Process) Status() (string, error) {
+	return p.StatusWithContext(context.Background())
+}
+
+func (p *Process) StatusWithContext(ctx context.Context) (string, error) {
+	r, err := callPsWithContext(ctx, "state", p.Pid, false)
+	if err != nil {
+		return "", err
+	}
+
+	return r[0][0][0:1], err
+}
+
+func (p *Process) Foreground() (bool, error) {
+	return p.ForegroundWithContext(context.Background())
+}
+
+func (p *Process) ForegroundWithContext(ctx context.Context) (bool, error) {
+	// see https://github.com/shirou/gopsutil/issues/596#issuecomment-432707831 for implementation details
+	pid := p.Pid
+	ps, err := exec.LookPath("ps")
+	if err != nil {
+		return false, err
+	}
+	out, err := invoke.CommandWithContext(ctx, ps, "-o", "stat=", "-p", strconv.Itoa(int(pid)))
+	if err != nil {
+		return false, err
+	}
+	return strings.IndexByte(string(out), '+') != -1, nil
+}
+
+func (p *Process) Uids() ([]int32, error) {
+	return p.UidsWithContext(context.Background())
+}
+
+func (p *Process) UidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	// See: http://unix.superglobalmegacorp.com/Net2/newsrc/sys/ucred.h.html
+	userEffectiveUID := int32(k.Eproc.Ucred.UID)
+
+	return []int32{userEffectiveUID}, nil
+}
+
+func (p *Process) Gids() ([]int32, error) {
+	return p.GidsWithContext(context.Background())
+}
+
+func (p *Process) GidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	gids := make([]int32, 0, 3)
+	gids = append(gids, int32(k.Eproc.Pcred.P_rgid), int32(k.Eproc.Ucred.Ngroups), int32(k.Eproc.Pcred.P_svgid))
+
+	return gids, nil
+}
+
+func (p *Process) GroupsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	groups := make([]int32, k.Eproc.Ucred.Ngroups)
+	for i := int16(0); i < k.Eproc.Ucred.Ngroups; i++ {
+		groups[i] = int32(k.Eproc.Ucred.Groups[i])
+	}
+
+	return groups, nil
+}
+
+func (p *Process) Terminal() (string, error) {
+	return p.TerminalWithContext(context.Background())
+}
+
+func (p *Process) TerminalWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+	/*
+		k, err := p.getKProc()
+		if err != nil {
+			return "", err
+		}
+
+		ttyNr := uint64(k.Eproc.Tdev)
+		termmap, err := getTerminalMap()
+		if err != nil {
+			return "", err
+		}
+
+		return termmap[ttyNr], nil
+	*/
+}
+
+func (p *Process) Nice() (int32, error) {
+	return p.NiceWithContext(context.Background())
+}
+
+func (p *Process) NiceWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+	return int32(k.Proc.P_nice), nil
+}
+
+func (p *Process) IOnice() (int32, error) {
+	return p.IOniceWithContext(context.Background())
+}
+
+func (p *Process) IOniceWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Rlimit() ([]RlimitStat, error) {
+	return p.RlimitWithContext(context.Background())
+}
+
+func (p *Process) RlimitWithContext(ctx context.Context) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) RlimitUsage(gatherUsed bool) ([]RlimitStat, error) {
+	return p.RlimitUsageWithContext(context.Background(), gatherUsed)
+}
+
+func (p *Process) RlimitUsageWithContext(ctx context.Context, gatherUsed bool) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) IOCounters() (*IOCountersStat, error) {
+	return p.IOCountersWithContext(context.Background())
+}
+
+func (p *Process) IOCountersWithContext(ctx context.Context) (*IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumCtxSwitches() (*NumCtxSwitchesStat, error) {
+	return p.NumCtxSwitchesWithContext(context.Background())
+}
+
+func (p *Process) NumCtxSwitchesWithContext(ctx context.Context) (*NumCtxSwitchesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumFDs() (int32, error) {
+	return p.NumFDsWithContext(context.Background())
+}
+
+func (p *Process) NumFDsWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) NumThreads() (int32, error) {
+	return p.NumThreadsWithContext(context.Background())
+}
+
+func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
+	r, err := callPsWithContext(ctx, "utime,stime", p.Pid, true)
+	if err != nil {
+		return 0, err
+	}
+	return int32(len(r)), nil
+}
+
+func (p *Process) Threads() (map[int32]*cpu.TimesStat, error) {
+	return p.ThreadsWithContext(context.Background())
+}
+
+func (p *Process) ThreadsWithContext(ctx context.Context) (map[int32]*cpu.TimesStat, error) {
+	ret := make(map[int32]*cpu.TimesStat)
+	return ret, common.ErrNotImplementedError
+}
+
+func convertCPUTimes(s string) (ret float64, err error) {
+	var t int
+	var _tmp string
+	if strings.Contains(s, ":") {
+		_t := strings.Split(s, ":")
+		switch len(_t) {
+		case 3:
+			hour, err := strconv.Atoi(_t[0])
+			if err != nil {
+				return ret, err
+			}
+			t += hour * 60 * 60 * ClockTicks
+
+			mins, err := strconv.Atoi(_t[1])
+			if err != nil {
+				return ret, err
+			}
+			t += mins * 60 * ClockTicks
+			_tmp = _t[2]
+		case 2:
+			mins, err := strconv.Atoi(_t[0])
+			if err != nil {
+				return ret, err
+			}
+			t += mins * 60 * ClockTicks
+			_tmp = _t[1]
+		case 1, 0:
+			_tmp = s
+		default:
+			return ret, fmt.Errorf("wrong cpu time string")
+		}
+	} else {
+		_tmp = s
+	}
+
+	_t := strings.Split(_tmp, ".")
+	if err != nil {
+		return ret, err
+	}
+	h, _ := strconv.Atoi(_t[0])
+	t += h * ClockTicks
+	h, _ = strconv.Atoi(_t[1])
+	t += h
+	return float64(t) / ClockTicks, nil
+}
+
+func (p *Process) Times() (*cpu.TimesStat, error) {
+	return p.TimesWithContext(context.Background())
+}
+
+func (p *Process) TimesWithContext(ctx context.Context) (*cpu.TimesStat, error) {
+	r, err := callPsWithContext(ctx, "utime,stime", p.Pid, false)
+	if err != nil {
+		return nil, err
+	}
+
+	utime, err := convertCPUTimes(r[0][0])
+	if err != nil {
+		return nil, err
+	}
+	stime, err := convertCPUTimes(r[0][1])
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &cpu.TimesStat{
+		CPU:    "cpu",
+		User:   utime,
+		System: stime,
+	}
+	return ret, nil
+}
+
+func (p *Process) CPUAffinity() ([]int32, error) {
+	return p.CPUAffinityWithContext(context.Background())
+}
+
+func (p *Process) CPUAffinityWithContext(ctx context.Context) ([]int32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfo() (*MemoryInfoStat, error) {
+	return p.MemoryInfoWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoWithContext(ctx context.Context) (*MemoryInfoStat, error) {
+	r, err := callPsWithContext(ctx, "rss,vsize,pagein", p.Pid, false)
+	if err != nil {
+		return nil, err
+	}
+	rss, err := strconv.Atoi(r[0][0])
+	if err != nil {
+		return nil, err
+	}
+	vms, err := strconv.Atoi(r[0][1])
+	if err != nil {
+		return nil, err
+	}
+	pagein, err := strconv.Atoi(r[0][2])
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &MemoryInfoStat{
+		RSS:  uint64(rss) * 1024,
+		VMS:  uint64(vms) * 1024,
+		Swap: uint64(pagein),
+	}
+
+	return ret, nil
+}
+
+func (p *Process) MemoryInfoEx() (*MemoryInfoExStat, error) {
+	return p.MemoryInfoExWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoExWithContext(ctx context.Context) (*MemoryInfoExStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) PageFaults() (*PageFaultsStat, error) {
+	return p.PageFaultsWithContext(context.Background())
+}
+
+func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Children() ([]*Process, error) {
+	return p.ChildrenWithContext(context.Background())
+}
+
+func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
+	pids, err := common.CallPgrepWithContext(ctx, invoke, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]*Process, 0, len(pids))
+	for _, pid := range pids {
+		np, err := NewProcess(pid)
+		if err != nil {
+			return nil, err
+		}
+		ret = append(ret, np)
+	}
+	return ret, nil
+}
+
+func (p *Process) OpenFiles() ([]OpenFilesStat, error) {
+	return p.OpenFilesWithContext(context.Background())
+}
+
+func (p *Process) OpenFilesWithContext(ctx context.Context) ([]OpenFilesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Connections() ([]net.ConnectionStat, error) {
+	return p.ConnectionsWithContext(context.Background())
+}
+
+func (p *Process) ConnectionsWithContext(ctx context.Context) ([]net.ConnectionStat, error) {
+	return net.ConnectionsPid("all", p.Pid)
+}
+
+// Connections returns a slice of net.ConnectionStat used by the process at most `max`
+func (p *Process) ConnectionsMax(max int) ([]net.ConnectionStat, error) {
+	return p.ConnectionsMaxWithContext(context.Background(), max)
+}
+
+func (p *Process) ConnectionsMaxWithContext(ctx context.Context, max int) ([]net.ConnectionStat, error) {
+	return net.ConnectionsPidMax("all", p.Pid, max)
+}
+
+func (p *Process) NetIOCounters(pernic bool) ([]net.IOCountersStat, error) {
+	return p.NetIOCountersWithContext(context.Background(), pernic)
+}
+
+func (p *Process) NetIOCountersWithContext(ctx context.Context, pernic bool) ([]net.IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
+	return p.MemoryMapsWithContext(context.Background(), grouped)
+}
+
+func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]MemoryMapsStat, error) {
+	var ret []MemoryMapsStat
+	return &ret, common.ErrNotImplementedError
+}
+
+func Processes() ([]*Process, error) {
+	return ProcessesWithContext(context.Background())
+}
+
+func ProcessesWithContext(ctx context.Context) ([]*Process, error) {
+	out := []*Process{}
+
+	pids, err := PidsWithContext(ctx)
+	if err != nil {
+		return out, err
+	}
+
+	for _, pid := range pids {
+		p, err := NewProcess(pid)
+		if err != nil {
+			continue
+		}
+		out = append(out, p)
+	}
+
+	return out, nil
+}
+
+func parseKinfoProc(buf []byte) (KinfoProc, error) {
+	var k KinfoProc
+	br := bytes.NewReader(buf)
+
+	err := common.Read(br, binary.LittleEndian, &k)
+	if err != nil {
+		return k, err
+	}
+
+	return k, nil
+}
+
+// Returns a proc as defined here:
+// http://unix.superglobalmegacorp.com/Net2/newsrc/sys/kinfo_proc.h.html
+func (p *Process) getKProc() (*KinfoProc, error) {
+	return p.getKProcWithContext(context.Background())
+}
+
+func (p *Process) getKProcWithContext(ctx context.Context) (*KinfoProc, error) {
+	mib := []int32{CTLKern, KernProc, KernProcPID, p.Pid}
+	length := uint64(unsafe.Sizeof(KinfoProc{}))
+	buf := make([]byte, length)
+	_, _, syserr := unix.Syscall6(
+		202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(len(mib)),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if syserr != 0 {
+		return nil, syserr
+	}
+	k, err := parseKinfoProc(buf)
+	if err != nil {
+		return nil, err
+	}
+
+	return &k, nil
+}
+
+// call ps command.
+// Return value deletes Header line(you must not input wrong arg).
+// And splited by Space. Caller have responsibility to manage.
+// If passed arg pid is 0, get information from all process.
+func callPsWithContext(ctx context.Context, arg string, pid int32, threadOption bool) ([][]string, error) {
+	bin, err := exec.LookPath("ps")
+	if err != nil {
+		return [][]string{}, err
+	}
+
+	var cmd []string
+	if pid == 0 { // will get from all processes.
+		cmd = []string{"-ax", "-o", arg}
+	} else if threadOption {
+		cmd = []string{"-x", "-o", arg, "-M", "-p", strconv.Itoa(int(pid))}
+	} else {
+		cmd = []string{"-x", "-o", arg, "-p", strconv.Itoa(int(pid))}
+	}
+	out, err := invoke.CommandWithContext(ctx, bin, cmd...)
+	if err != nil {
+		return [][]string{}, err
+	}
+	lines := strings.Split(string(out), "\n")
+
+	var ret [][]string
+	for _, l := range lines[1:] {
+		var lr []string
+		for _, r := range strings.Split(l, " ") {
+			if r == "" {
+				continue
+			}
+			lr = append(lr, strings.TrimSpace(r))
+		}
+		if len(lr) != 0 {
+			ret = append(ret, lr)
+		}
+	}
+
+	return ret, nil
+}

internal/gopsutil/process/process_darwin_386.go

@@ -0,0 +1,234 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_darwin.go
+
+package process
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec       int64
+	Usec      int32
+	Pad_cgo_0 [4]byte
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur uint64
+	Max uint64
+}
+
+type UGid_t uint32
+
+type KinfoProc struct {
+	Proc  ExternProc
+	Eproc Eproc
+}
+
+type Eproc struct {
+	Paddr     *uint64
+	Sess      *Session
+	Pcred     Upcred
+	Ucred     Uucred
+	Pad_cgo_0 [4]byte
+	Vm        Vmspace
+	Ppid      int32
+	Pgid      int32
+	Jobc      int16
+	Pad_cgo_1 [2]byte
+	Tdev      int32
+	Tpgid     int32
+	Pad_cgo_2 [4]byte
+	Tsess     *Session
+	Wmesg     [8]int8
+	Xsize     int32
+	Xrssize   int16
+	Xccount   int16
+	Xswrss    int16
+	Pad_cgo_3 [2]byte
+	Flag      int32
+	Login     [12]int8
+	Spare     [4]int32
+	Pad_cgo_4 [4]byte
+}
+
+type Proc struct{}
+
+type Session struct{}
+
+type ucred struct {
+	Link  _Ctype_struct___0
+	Ref   uint64
+	Posix Posix_cred
+	Label *Label
+	Audit Au_session
+}
+
+type Uucred struct {
+	Ref       int32
+	UID       uint32
+	Ngroups   int16
+	Pad_cgo_0 [2]byte
+	Groups    [16]uint32
+}
+
+type Upcred struct {
+	Pc_lock   [72]int8
+	Pc_ucred  *ucred
+	P_ruid    uint32
+	P_svuid   uint32
+	P_rgid    uint32
+	P_svgid   uint32
+	P_refcnt  int32
+	Pad_cgo_0 [4]byte
+}
+
+type Vmspace struct {
+	Dummy     int32
+	Pad_cgo_0 [4]byte
+	Dummy2    *int8
+	Dummy3    [5]int32
+	Pad_cgo_1 [4]byte
+	Dummy4    [3]*int8
+}
+
+type Sigacts struct{}
+
+type ExternProc struct {
+	P_un        [16]byte
+	P_vmspace   uint64
+	P_sigacts   uint64
+	Pad_cgo_0   [3]byte
+	P_flag      int32
+	P_stat      int8
+	P_pid       int32
+	P_oppid     int32
+	P_dupfd     int32
+	Pad_cgo_1   [4]byte
+	User_stack  uint64
+	Exit_thread uint64
+	P_debugger  int32
+	Sigwait     int32
+	P_estcpu    uint32
+	P_cpticks   int32
+	P_pctcpu    uint32
+	Pad_cgo_2   [4]byte
+	P_wchan     uint64
+	P_wmesg     uint64
+	P_swtime    uint32
+	P_slptime   uint32
+	P_realtimer Itimerval
+	P_rtime     Timeval
+	P_uticks    uint64
+	P_sticks    uint64
+	P_iticks    uint64
+	P_traceflag int32
+	Pad_cgo_3   [4]byte
+	P_tracep    uint64
+	P_siglist   int32
+	Pad_cgo_4   [4]byte
+	P_textvp    uint64
+	P_holdcnt   int32
+	P_sigmask   uint32
+	P_sigignore uint32
+	P_sigcatch  uint32
+	P_priority  uint8
+	P_usrpri    uint8
+	P_nice      int8
+	P_comm      [17]int8
+	Pad_cgo_5   [4]byte
+	P_pgrp      uint64
+	P_addr      uint64
+	P_xstat     uint16
+	P_acflag    uint16
+	Pad_cgo_6   [4]byte
+	P_ru        uint64
+}
+
+type Itimerval struct {
+	Interval Timeval
+	Value    Timeval
+}
+
+type Vnode struct{}
+
+type Pgrp struct{}
+
+type UserStruct struct{}
+
+type Au_session struct {
+	Aia_p *AuditinfoAddr
+	Mask  AuMask
+}
+
+type Posix_cred struct {
+	UID       uint32
+	Ruid      uint32
+	Svuid     uint32
+	Ngroups   int16
+	Pad_cgo_0 [2]byte
+	Groups    [16]uint32
+	Rgid      uint32
+	Svgid     uint32
+	Gmuid     uint32
+	Flags     int32
+}
+
+type Label struct{}
+
+type AuditinfoAddr struct {
+	Auid   uint32
+	Mask   AuMask
+	Termid AuTidAddr
+	Asid   int32
+	Flags  uint64
+}
+type AuMask struct {
+	Success uint32
+	Failure uint32
+}
+type AuTidAddr struct {
+	Port int32
+	Type uint32
+	Addr [4]uint32
+}
+
+type UcredQueue struct {
+	Next *ucred
+	Prev **ucred
+}

internal/gopsutil/process/process_darwin_amd64.go

@@ -0,0 +1,234 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_darwin.go
+
+package process
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec       int64
+	Usec      int32
+	Pad_cgo_0 [4]byte
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur uint64
+	Max uint64
+}
+
+type UGid_t uint32
+
+type KinfoProc struct {
+	Proc  ExternProc
+	Eproc Eproc
+}
+
+type Eproc struct {
+	Paddr     *uint64
+	Sess      *Session
+	Pcred     Upcred
+	Ucred     Uucred
+	Pad_cgo_0 [4]byte
+	Vm        Vmspace
+	Ppid      int32
+	Pgid      int32
+	Jobc      int16
+	Pad_cgo_1 [2]byte
+	Tdev      int32
+	Tpgid     int32
+	Pad_cgo_2 [4]byte
+	Tsess     *Session
+	Wmesg     [8]int8
+	Xsize     int32
+	Xrssize   int16
+	Xccount   int16
+	Xswrss    int16
+	Pad_cgo_3 [2]byte
+	Flag      int32
+	Login     [12]int8
+	Spare     [4]int32
+	Pad_cgo_4 [4]byte
+}
+
+type Proc struct{}
+
+type Session struct{}
+
+type ucred struct {
+	Link  _Ctype_struct___0
+	Ref   uint64
+	Posix Posix_cred
+	Label *Label
+	Audit Au_session
+}
+
+type Uucred struct {
+	Ref       int32
+	UID       uint32
+	Ngroups   int16
+	Pad_cgo_0 [2]byte
+	Groups    [16]uint32
+}
+
+type Upcred struct {
+	Pc_lock   [72]int8
+	Pc_ucred  *ucred
+	P_ruid    uint32
+	P_svuid   uint32
+	P_rgid    uint32
+	P_svgid   uint32
+	P_refcnt  int32
+	Pad_cgo_0 [4]byte
+}
+
+type Vmspace struct {
+	Dummy     int32
+	Pad_cgo_0 [4]byte
+	Dummy2    *int8
+	Dummy3    [5]int32
+	Pad_cgo_1 [4]byte
+	Dummy4    [3]*int8
+}
+
+type Sigacts struct{}
+
+type ExternProc struct {
+	P_un        [16]byte
+	P_vmspace   uint64
+	P_sigacts   uint64
+	Pad_cgo_0   [3]byte
+	P_flag      int32
+	P_stat      int8
+	P_pid       int32
+	P_oppid     int32
+	P_dupfd     int32
+	Pad_cgo_1   [4]byte
+	User_stack  uint64
+	Exit_thread uint64
+	P_debugger  int32
+	Sigwait     int32
+	P_estcpu    uint32
+	P_cpticks   int32
+	P_pctcpu    uint32
+	Pad_cgo_2   [4]byte
+	P_wchan     uint64
+	P_wmesg     uint64
+	P_swtime    uint32
+	P_slptime   uint32
+	P_realtimer Itimerval
+	P_rtime     Timeval
+	P_uticks    uint64
+	P_sticks    uint64
+	P_iticks    uint64
+	P_traceflag int32
+	Pad_cgo_3   [4]byte
+	P_tracep    uint64
+	P_siglist   int32
+	Pad_cgo_4   [4]byte
+	P_textvp    uint64
+	P_holdcnt   int32
+	P_sigmask   uint32
+	P_sigignore uint32
+	P_sigcatch  uint32
+	P_priority  uint8
+	P_usrpri    uint8
+	P_nice      int8
+	P_comm      [17]int8
+	Pad_cgo_5   [4]byte
+	P_pgrp      uint64
+	P_addr      uint64
+	P_xstat     uint16
+	P_acflag    uint16
+	Pad_cgo_6   [4]byte
+	P_ru        uint64
+}
+
+type Itimerval struct {
+	Interval Timeval
+	Value    Timeval
+}
+
+type Vnode struct{}
+
+type Pgrp struct{}
+
+type UserStruct struct{}
+
+type Au_session struct {
+	Aia_p *AuditinfoAddr
+	Mask  AuMask
+}
+
+type Posix_cred struct {
+	UID       uint32
+	Ruid      uint32
+	Svuid     uint32
+	Ngroups   int16
+	Pad_cgo_0 [2]byte
+	Groups    [16]uint32
+	Rgid      uint32
+	Svgid     uint32
+	Gmuid     uint32
+	Flags     int32
+}
+
+type Label struct{}
+
+type AuditinfoAddr struct {
+	Auid   uint32
+	Mask   AuMask
+	Termid AuTidAddr
+	Asid   int32
+	Flags  uint64
+}
+type AuMask struct {
+	Success uint32
+	Failure uint32
+}
+type AuTidAddr struct {
+	Port int32
+	Type uint32
+	Addr [4]uint32
+}
+
+type UcredQueue struct {
+	Next *ucred
+	Prev **ucred
+}

internal/gopsutil/process/process_darwin_arm64.go

@@ -0,0 +1,205 @@
+//go:build darwin && arm64
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs process/types_darwin.go
+
+package process
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec       int64
+	Usec      int32
+	Pad_cgo_0 [4]byte
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur uint64
+	Max uint64
+}
+
+type UGid_t uint32
+
+type KinfoProc struct {
+	Proc  ExternProc
+	Eproc Eproc
+}
+
+type Eproc struct {
+	Paddr     *Proc
+	Sess      *Session
+	Pcred     Upcred
+	Ucred     Uucred
+	Vm        Vmspace
+	Ppid      int32
+	Pgid      int32
+	Jobc      int16
+	Tdev      int32
+	Tpgid     int32
+	Tsess     *Session
+	Wmesg     [8]int8
+	Xsize     int32
+	Xrssize   int16
+	Xccount   int16
+	Xswrss    int16
+	Flag      int32
+	Login     [12]int8
+	Spare     [4]int32
+	Pad_cgo_0 [4]byte
+}
+
+type Proc struct{}
+
+type Session struct{}
+
+type ucred struct{}
+
+type Uucred struct {
+	Ref     int32
+	UID     uint32
+	Ngroups int16
+	Groups  [16]uint32
+}
+
+type Upcred struct {
+	Pc_lock   [72]int8
+	Pc_ucred  *ucred
+	P_ruid    uint32
+	P_svuid   uint32
+	P_rgid    uint32
+	P_svgid   uint32
+	P_refcnt  int32
+	Pad_cgo_0 [4]byte
+}
+
+type Vmspace struct {
+	Dummy  int32
+	Dummy2 *int8
+	Dummy3 [5]int32
+	Dummy4 [3]*int8
+}
+
+type Sigacts struct{}
+
+type ExternProc struct {
+	P_un        [16]byte
+	P_vmspace   *Vmspace
+	P_sigacts   *Sigacts
+	P_flag      int32
+	P_stat      int8
+	P_pid       int32
+	P_oppid     int32
+	P_dupfd     int32
+	User_stack  *int8
+	Exit_thread *byte
+	P_debugger  int32
+	Sigwait     int32
+	P_estcpu    uint32
+	P_cpticks   int32
+	P_pctcpu    uint32
+	P_wchan     *byte
+	P_wmesg     *int8
+	P_swtime    uint32
+	P_slptime   uint32
+	P_realtimer Itimerval
+	P_rtime     Timeval
+	P_uticks    uint64
+	P_sticks    uint64
+	P_iticks    uint64
+	P_traceflag int32
+	P_tracep    *Vnode
+	P_siglist   int32
+	P_textvp    *Vnode
+	P_holdcnt   int32
+	P_sigmask   uint32
+	P_sigignore uint32
+	P_sigcatch  uint32
+	P_priority  uint8
+	P_usrpri    uint8
+	P_nice      int8
+	P_comm      [17]int8
+	P_pgrp      *Pgrp
+	P_addr      *UserStruct
+	P_xstat     uint16
+	P_acflag    uint16
+	P_ru        *Rusage
+}
+
+type Itimerval struct {
+	Interval Timeval
+	Value    Timeval
+}
+
+type Vnode struct{}
+
+type Pgrp struct{}
+
+type UserStruct struct{}
+
+type Au_session struct {
+	Aia_p *AuditinfoAddr
+	Mask  AuMask
+}
+
+type Posix_cred struct{}
+
+type Label struct{}
+
+type AuditinfoAddr struct {
+	Auid   uint32
+	Mask   AuMask
+	Termid AuTidAddr
+	Asid   int32
+	Flags  uint64
+}
+type AuMask struct {
+	Success uint32
+	Failure uint32
+}
+type AuTidAddr struct {
+	Port int32
+	Type uint32
+	Addr [4]uint32
+}
+
+type UcredQueue struct {
+	Next *ucred
+	Prev **ucred
+}

internal/gopsutil/process/process_darwin_cgo.go

@@ -0,0 +1,30 @@
+//go:build darwin && cgo
+
+package process
+
+// #include <stdlib.h>
+// #include <libproc.h>
+import "C"
+
+import (
+	"context"
+	"fmt"
+	"unsafe"
+)
+
+func (p *Process) ExeWithContext(ctx context.Context) (string, error) {
+	var c C.char // need a var for unsafe.Sizeof need a var
+	const bufsize = C.PROC_PIDPATHINFO_MAXSIZE * unsafe.Sizeof(c)
+	buffer := (*C.char)(C.malloc(C.size_t(bufsize)))
+	defer C.free(unsafe.Pointer(buffer))
+
+	ret, err := C.proc_pidpath(C.int(p.Pid), unsafe.Pointer(buffer), C.uint32_t(bufsize))
+	if err != nil {
+		return "", err
+	}
+	if ret <= 0 {
+		return "", fmt.Errorf("unknown error: proc_pidpath returned %d", ret)
+	}
+
+	return C.GoString(buffer), nil
+}

internal/gopsutil/process/process_darwin_nocgo.go

@@ -0,0 +1,33 @@
+//go:build darwin && !cgo
+
+package process
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+func (p *Process) ExeWithContext(ctx context.Context) (string, error) {
+	lsof_bin, err := exec.LookPath("lsof")
+	if err != nil {
+		return "", err
+	}
+	out, err := invoke.CommandWithContext(ctx, lsof_bin, "-p", strconv.Itoa(int(p.Pid)), "-Fpfn")
+	if err != nil {
+		return "", fmt.Errorf("bad call to lsof: %s", err)
+	}
+	txtFound := 0
+	lines := strings.Split(string(out), "\n")
+	for i := 1; i < len(lines); i++ {
+		if lines[i] == "ftxt" {
+			txtFound++
+			if txtFound == 2 {
+				return lines[i-1][1:], nil
+			}
+		}
+	}
+	return "", fmt.Errorf("missing txt data returned by lsof")
+}

internal/gopsutil/process/process_fallback.go

@@ -0,0 +1,371 @@
+//go:build !darwin && !linux && !freebsd && !openbsd && !windows
+
+package process
+
+import (
+	"context"
+	"syscall"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/cpu"
+	"github.com/gofiber/fiber/v2/internal/gopsutil/net"
+)
+
+type MemoryMapsStat struct {
+	Path         string `json:"path"`
+	Rss          uint64 `json:"rss"`
+	Size         uint64 `json:"size"`
+	Pss          uint64 `json:"pss"`
+	SharedClean  uint64 `json:"sharedClean"`
+	SharedDirty  uint64 `json:"sharedDirty"`
+	PrivateClean uint64 `json:"privateClean"`
+	PrivateDirty uint64 `json:"privateDirty"`
+	Referenced   uint64 `json:"referenced"`
+	Anonymous    uint64 `json:"anonymous"`
+	Swap         uint64 `json:"swap"`
+}
+
+type MemoryInfoExStat struct{}
+
+func pidsWithContext(ctx context.Context) ([]int32, error) {
+	return []int32{}, common.ErrNotImplementedError
+}
+
+func Processes() ([]*Process, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func ProcessesWithContext(ctx context.Context) ([]*Process, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func PidExistsWithContext(ctx context.Context, pid int32) (bool, error) {
+	pids, err := PidsWithContext(ctx)
+	if err != nil {
+		return false, err
+	}
+
+	for _, i := range pids {
+		if i == pid {
+			return true, err
+		}
+	}
+
+	return false, err
+}
+
+func (p *Process) Ppid() (int32, error) {
+	return p.PpidWithContext(context.Background())
+}
+
+func (p *Process) PpidWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Name() (string, error) {
+	return p.NameWithContext(context.Background())
+}
+
+func (p *Process) NameWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Tgid() (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Exe() (string, error) {
+	return p.ExeWithContext(context.Background())
+}
+
+func (p *Process) ExeWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Cmdline() (string, error) {
+	return p.CmdlineWithContext(context.Background())
+}
+
+func (p *Process) CmdlineWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) CmdlineSlice() ([]string, error) {
+	return p.CmdlineSliceWithContext(context.Background())
+}
+
+func (p *Process) CmdlineSliceWithContext(ctx context.Context) ([]string, error) {
+	return []string{}, common.ErrNotImplementedError
+}
+
+func (p *Process) createTimeWithContext(ctx context.Context) (int64, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Cwd() (string, error) {
+	return p.CwdWithContext(context.Background())
+}
+
+func (p *Process) CwdWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Parent() (*Process, error) {
+	return p.ParentWithContext(context.Background())
+}
+
+func (p *Process) ParentWithContext(ctx context.Context) (*Process, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Status() (string, error) {
+	return p.StatusWithContext(context.Background())
+}
+
+func (p *Process) StatusWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Foreground() (bool, error) {
+	return p.ForegroundWithContext(context.Background())
+}
+
+func (p *Process) ForegroundWithContext(ctx context.Context) (bool, error) {
+	return false, common.ErrNotImplementedError
+}
+
+func (p *Process) Uids() ([]int32, error) {
+	return p.UidsWithContext(context.Background())
+}
+
+func (p *Process) UidsWithContext(ctx context.Context) ([]int32, error) {
+	return []int32{}, common.ErrNotImplementedError
+}
+
+func (p *Process) Gids() ([]int32, error) {
+	return p.GidsWithContext(context.Background())
+}
+
+func (p *Process) GidsWithContext(ctx context.Context) ([]int32, error) {
+	return []int32{}, common.ErrNotImplementedError
+}
+
+func (p *Process) GroupsWithContext(ctx context.Context) ([]int32, error) {
+	return []int32{}, common.ErrNotImplementedError
+}
+
+func (p *Process) Terminal() (string, error) {
+	return p.TerminalWithContext(context.Background())
+}
+
+func (p *Process) TerminalWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Nice() (int32, error) {
+	return p.NiceWithContext(context.Background())
+}
+
+func (p *Process) NiceWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) IOnice() (int32, error) {
+	return p.IOniceWithContext(context.Background())
+}
+
+func (p *Process) IOniceWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Rlimit() ([]RlimitStat, error) {
+	return p.RlimitWithContext(context.Background())
+}
+
+func (p *Process) RlimitWithContext(ctx context.Context) ([]RlimitStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) RlimitUsage(gatherUsed bool) ([]RlimitStat, error) {
+	return p.RlimitUsageWithContext(context.Background(), gatherUsed)
+}
+
+func (p *Process) RlimitUsageWithContext(ctx context.Context, gatherUsed bool) ([]RlimitStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) IOCounters() (*IOCountersStat, error) {
+	return p.IOCountersWithContext(context.Background())
+}
+
+func (p *Process) IOCountersWithContext(ctx context.Context) (*IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumCtxSwitches() (*NumCtxSwitchesStat, error) {
+	return p.NumCtxSwitchesWithContext(context.Background())
+}
+
+func (p *Process) NumCtxSwitchesWithContext(ctx context.Context) (*NumCtxSwitchesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumFDs() (int32, error) {
+	return p.NumFDsWithContext(context.Background())
+}
+
+func (p *Process) NumFDsWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) NumThreads() (int32, error) {
+	return p.NumThreadsWithContext(context.Background())
+}
+
+func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Threads() (map[int32]*cpu.TimesStat, error) {
+	return p.ThreadsWithContext(context.Background())
+}
+
+func (p *Process) ThreadsWithContext(ctx context.Context) (map[int32]*cpu.TimesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Times() (*cpu.TimesStat, error) {
+	return p.TimesWithContext(context.Background())
+}
+
+func (p *Process) TimesWithContext(ctx context.Context) (*cpu.TimesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) CPUAffinity() ([]int32, error) {
+	return p.CPUAffinityWithContext(context.Background())
+}
+
+func (p *Process) CPUAffinityWithContext(ctx context.Context) ([]int32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfo() (*MemoryInfoStat, error) {
+	return p.MemoryInfoWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoWithContext(ctx context.Context) (*MemoryInfoStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfoEx() (*MemoryInfoExStat, error) {
+	return p.MemoryInfoExWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoExWithContext(ctx context.Context) (*MemoryInfoExStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) PageFaults() (*PageFaultsStat, error) {
+	return p.PageFaultsWithContext(context.Background())
+}
+
+func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Children() ([]*Process, error) {
+	return p.ChildrenWithContext(context.Background())
+}
+
+func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) OpenFiles() ([]OpenFilesStat, error) {
+	return p.OpenFilesWithContext(context.Background())
+}
+
+func (p *Process) OpenFilesWithContext(ctx context.Context) ([]OpenFilesStat, error) {
+	return []OpenFilesStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) Connections() ([]net.ConnectionStat, error) {
+	return p.ConnectionsWithContext(context.Background())
+}
+
+func (p *Process) ConnectionsWithContext(ctx context.Context) ([]net.ConnectionStat, error) {
+	return []net.ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) ConnectionsMax(max int) ([]net.ConnectionStat, error) {
+	return p.ConnectionsMaxWithContext(context.Background(), max)
+}
+
+func (p *Process) ConnectionsMaxWithContext(ctx context.Context, max int) ([]net.ConnectionStat, error) {
+	return []net.ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) NetIOCounters(pernic bool) ([]net.IOCountersStat, error) {
+	return p.NetIOCountersWithContext(context.Background(), pernic)
+}
+
+func (p *Process) NetIOCountersWithContext(ctx context.Context, pernic bool) ([]net.IOCountersStat, error) {
+	return []net.IOCountersStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
+	return p.MemoryMapsWithContext(context.Background(), grouped)
+}
+
+func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]MemoryMapsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) SendSignal(sig syscall.Signal) error {
+	return p.SendSignalWithContext(context.Background(), sig)
+}
+
+func (p *Process) SendSignalWithContext(ctx context.Context, sig syscall.Signal) error {
+	return common.ErrNotImplementedError
+}
+
+func (p *Process) Suspend() error {
+	return p.SuspendWithContext(context.Background())
+}
+
+func (p *Process) SuspendWithContext(ctx context.Context) error {
+	return common.ErrNotImplementedError
+}
+
+func (p *Process) Resume() error {
+	return p.ResumeWithContext(context.Background())
+}
+
+func (p *Process) ResumeWithContext(ctx context.Context) error {
+	return common.ErrNotImplementedError
+}
+
+func (p *Process) Terminate() error {
+	return p.TerminateWithContext(context.Background())
+}
+
+func (p *Process) TerminateWithContext(ctx context.Context) error {
+	return common.ErrNotImplementedError
+}
+
+func (p *Process) Kill() error {
+	return p.KillWithContext(context.Background())
+}
+
+func (p *Process) KillWithContext(ctx context.Context) error {
+	return common.ErrNotImplementedError
+}
+
+func (p *Process) Username() (string, error) {
+	return p.UsernameWithContext(context.Background())
+}
+
+func (p *Process) UsernameWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}

internal/gopsutil/process/process_freebsd.go

@@ -0,0 +1,549 @@
+//go:build freebsd
+
+package process
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	cpu "github.com/gofiber/fiber/v2/internal/gopsutil/cpu"
+	net "github.com/gofiber/fiber/v2/internal/gopsutil/net"
+)
+
+// MemoryInfoExStat is different between OSes
+type MemoryInfoExStat struct{}
+
+type MemoryMapsStat struct{}
+
+func pidsWithContext(ctx context.Context) ([]int32, error) {
+	var ret []int32
+	procs, err := Processes()
+	if err != nil {
+		return ret, nil
+	}
+
+	for _, p := range procs {
+		ret = append(ret, p.Pid)
+	}
+
+	return ret, nil
+}
+
+func (p *Process) Ppid() (int32, error) {
+	return p.PpidWithContext(context.Background())
+}
+
+func (p *Process) PpidWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+
+	return k.Ppid, nil
+}
+
+func (p *Process) Name() (string, error) {
+	return p.NameWithContext(context.Background())
+}
+
+func (p *Process) NameWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+	name := common.IntToString(k.Comm[:])
+
+	if len(name) >= 15 {
+		cmdlineSlice, err := p.CmdlineSliceWithContext(ctx)
+		if err != nil {
+			return "", err
+		}
+		if len(cmdlineSlice) > 0 {
+			extendedName := filepath.Base(cmdlineSlice[0])
+			if strings.HasPrefix(extendedName, p.name) {
+				name = extendedName
+			} else {
+				name = cmdlineSlice[0]
+			}
+		}
+	}
+
+	return name, nil
+}
+
+func (p *Process) Tgid() (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Exe() (string, error) {
+	return p.ExeWithContext(context.Background())
+}
+
+func (p *Process) ExeWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Cmdline() (string, error) {
+	return p.CmdlineWithContext(context.Background())
+}
+
+func (p *Process) CmdlineWithContext(ctx context.Context) (string, error) {
+	mib := []int32{CTLKern, KernProc, KernProcArgs, p.Pid}
+	buf, _, err := common.CallSyscall(mib)
+	if err != nil {
+		return "", err
+	}
+	ret := strings.FieldsFunc(string(buf), func(r rune) bool {
+		if r == '\u0000' {
+			return true
+		}
+		return false
+	})
+
+	return strings.Join(ret, " "), nil
+}
+
+func (p *Process) CmdlineSlice() ([]string, error) {
+	return p.CmdlineSliceWithContext(context.Background())
+}
+
+func (p *Process) CmdlineSliceWithContext(ctx context.Context) ([]string, error) {
+	mib := []int32{CTLKern, KernProc, KernProcArgs, p.Pid}
+	buf, _, err := common.CallSyscall(mib)
+	if err != nil {
+		return nil, err
+	}
+	if len(buf) == 0 {
+		return nil, nil
+	}
+	if buf[len(buf)-1] == 0 {
+		buf = buf[:len(buf)-1]
+	}
+	parts := bytes.Split(buf, []byte{0})
+	var strParts []string
+	for _, p := range parts {
+		strParts = append(strParts, string(p))
+	}
+
+	return strParts, nil
+}
+
+func (p *Process) createTimeWithContext(ctx context.Context) (int64, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Cwd() (string, error) {
+	return p.CwdWithContext(context.Background())
+}
+
+func (p *Process) CwdWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Parent() (*Process, error) {
+	return p.ParentWithContext(context.Background())
+}
+
+func (p *Process) ParentWithContext(ctx context.Context) (*Process, error) {
+	return p, common.ErrNotImplementedError
+}
+
+func (p *Process) Status() (string, error) {
+	return p.StatusWithContext(context.Background())
+}
+
+func (p *Process) StatusWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+	var s string
+	switch k.Stat {
+	case SIDL:
+		s = "I"
+	case SRUN:
+		s = "R"
+	case SSLEEP:
+		s = "S"
+	case SSTOP:
+		s = "T"
+	case SZOMB:
+		s = "Z"
+	case SWAIT:
+		s = "W"
+	case SLOCK:
+		s = "L"
+	}
+
+	return s, nil
+}
+
+func (p *Process) Foreground() (bool, error) {
+	return p.ForegroundWithContext(context.Background())
+}
+
+func (p *Process) ForegroundWithContext(ctx context.Context) (bool, error) {
+	// see https://github.com/shirou/gopsutil/issues/596#issuecomment-432707831 for implementation details
+	pid := p.Pid
+	ps, err := exec.LookPath("ps")
+	if err != nil {
+		return false, err
+	}
+	out, err := invoke.CommandWithContext(ctx, ps, "-o", "stat=", "-p", strconv.Itoa(int(pid)))
+	if err != nil {
+		return false, err
+	}
+	return strings.IndexByte(string(out), '+') != -1, nil
+}
+
+func (p *Process) Uids() ([]int32, error) {
+	return p.UidsWithContext(context.Background())
+}
+
+func (p *Process) UidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	uids := make([]int32, 0, 3)
+
+	uids = append(uids, int32(k.Ruid), int32(k.Uid), int32(k.Svuid))
+
+	return uids, nil
+}
+
+func (p *Process) Gids() ([]int32, error) {
+	return p.GidsWithContext(context.Background())
+}
+
+func (p *Process) GidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	gids := make([]int32, 0, 3)
+	gids = append(gids, int32(k.Rgid), int32(k.Ngroups), int32(k.Svgid))
+
+	return gids, nil
+}
+
+func (p *Process) GroupsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	groups := make([]int32, k.Ngroups)
+	for i := int16(0); i < k.Ngroups; i++ {
+		groups[i] = int32(k.Groups[i])
+	}
+
+	return groups, nil
+}
+
+func (p *Process) Terminal() (string, error) {
+	return p.TerminalWithContext(context.Background())
+}
+
+func (p *Process) TerminalWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+
+	ttyNr := uint64(k.Tdev)
+
+	termmap, err := getTerminalMap()
+	if err != nil {
+		return "", err
+	}
+
+	return termmap[ttyNr], nil
+}
+
+func (p *Process) Nice() (int32, error) {
+	return p.NiceWithContext(context.Background())
+}
+
+func (p *Process) NiceWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+	return int32(k.Nice), nil
+}
+
+func (p *Process) IOnice() (int32, error) {
+	return p.IOniceWithContext(context.Background())
+}
+
+func (p *Process) IOniceWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Rlimit() ([]RlimitStat, error) {
+	return p.RlimitWithContext(context.Background())
+}
+
+func (p *Process) RlimitWithContext(ctx context.Context) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) RlimitUsage(gatherUsed bool) ([]RlimitStat, error) {
+	return p.RlimitUsageWithContext(context.Background(), gatherUsed)
+}
+
+func (p *Process) RlimitUsageWithContext(ctx context.Context, gatherUsed bool) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) IOCounters() (*IOCountersStat, error) {
+	return p.IOCountersWithContext(context.Background())
+}
+
+func (p *Process) IOCountersWithContext(ctx context.Context) (*IOCountersStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	return &IOCountersStat{
+		ReadCount:  uint64(k.Rusage.Inblock),
+		WriteCount: uint64(k.Rusage.Oublock),
+	}, nil
+}
+
+func (p *Process) NumCtxSwitches() (*NumCtxSwitchesStat, error) {
+	return p.NumCtxSwitchesWithContext(context.Background())
+}
+
+func (p *Process) NumCtxSwitchesWithContext(ctx context.Context) (*NumCtxSwitchesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumFDs() (int32, error) {
+	return p.NumFDsWithContext(context.Background())
+}
+
+func (p *Process) NumFDsWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) NumThreads() (int32, error) {
+	return p.NumThreadsWithContext(context.Background())
+}
+
+func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+
+	return k.Numthreads, nil
+}
+
+func (p *Process) Threads() (map[int32]*cpu.TimesStat, error) {
+	return p.ThreadsWithContext(context.Background())
+}
+
+func (p *Process) ThreadsWithContext(ctx context.Context) (map[int32]*cpu.TimesStat, error) {
+	ret := make(map[int32]*cpu.TimesStat)
+	return ret, common.ErrNotImplementedError
+}
+
+func (p *Process) Times() (*cpu.TimesStat, error) {
+	return p.TimesWithContext(context.Background())
+}
+
+func (p *Process) TimesWithContext(ctx context.Context) (*cpu.TimesStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	return &cpu.TimesStat{
+		CPU:    "cpu",
+		User:   float64(k.Rusage.Utime.Sec) + float64(k.Rusage.Utime.Usec)/1000000,
+		System: float64(k.Rusage.Stime.Sec) + float64(k.Rusage.Stime.Usec)/1000000,
+	}, nil
+}
+
+func (p *Process) CPUAffinity() ([]int32, error) {
+	return p.CPUAffinityWithContext(context.Background())
+}
+
+func (p *Process) CPUAffinityWithContext(ctx context.Context) ([]int32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfo() (*MemoryInfoStat, error) {
+	return p.MemoryInfoWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoWithContext(ctx context.Context) (*MemoryInfoStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	v, err := unix.Sysctl("vm.stats.vm.v_page_size")
+	if err != nil {
+		return nil, err
+	}
+	pageSize := common.LittleEndian.Uint16([]byte(v))
+
+	return &MemoryInfoStat{
+		RSS: uint64(k.Rssize) * uint64(pageSize),
+		VMS: uint64(k.Size),
+	}, nil
+}
+
+func (p *Process) MemoryInfoEx() (*MemoryInfoExStat, error) {
+	return p.MemoryInfoExWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoExWithContext(ctx context.Context) (*MemoryInfoExStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) PageFaults() (*PageFaultsStat, error) {
+	return p.PageFaultsWithContext(context.Background())
+}
+
+func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Children() ([]*Process, error) {
+	return p.ChildrenWithContext(context.Background())
+}
+
+func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
+	pids, err := common.CallPgrepWithContext(ctx, invoke, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]*Process, 0, len(pids))
+	for _, pid := range pids {
+		np, err := NewProcess(pid)
+		if err != nil {
+			return nil, err
+		}
+		ret = append(ret, np)
+	}
+	return ret, nil
+}
+
+func (p *Process) OpenFiles() ([]OpenFilesStat, error) {
+	return p.OpenFilesWithContext(context.Background())
+}
+
+func (p *Process) OpenFilesWithContext(ctx context.Context) ([]OpenFilesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Connections() ([]net.ConnectionStat, error) {
+	return p.ConnectionsWithContext(context.Background())
+}
+
+func (p *Process) ConnectionsWithContext(ctx context.Context) ([]net.ConnectionStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+// Connections returns a slice of net.ConnectionStat used by the process at most `max`
+func (p *Process) ConnectionsMax(max int) ([]net.ConnectionStat, error) {
+	return p.ConnectionsMaxWithContext(context.Background(), max)
+}
+
+func (p *Process) ConnectionsMaxWithContext(ctx context.Context, max int) ([]net.ConnectionStat, error) {
+	return []net.ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) NetIOCounters(pernic bool) ([]net.IOCountersStat, error) {
+	return p.NetIOCountersWithContext(context.Background(), pernic)
+}
+
+func (p *Process) NetIOCountersWithContext(ctx context.Context, pernic bool) ([]net.IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
+	return p.MemoryMapsWithContext(context.Background(), grouped)
+}
+
+func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]MemoryMapsStat, error) {
+	var ret []MemoryMapsStat
+	return &ret, common.ErrNotImplementedError
+}
+
+func Processes() ([]*Process, error) {
+	return ProcessesWithContext(context.Background())
+}
+
+func ProcessesWithContext(ctx context.Context) ([]*Process, error) {
+	results := []*Process{}
+
+	mib := []int32{CTLKern, KernProc, KernProcProc, 0}
+	buf, length, err := common.CallSyscall(mib)
+	if err != nil {
+		return results, err
+	}
+
+	// get kinfo_proc size
+	count := int(length / uint64(sizeOfKinfoProc))
+
+	// parse buf to procs
+	for i := 0; i < count; i++ {
+		b := buf[i*sizeOfKinfoProc : (i+1)*sizeOfKinfoProc]
+		k, err := parseKinfoProc(b)
+		if err != nil {
+			continue
+		}
+		p, err := NewProcess(int32(k.Pid))
+		if err != nil {
+			continue
+		}
+
+		results = append(results, p)
+	}
+
+	return results, nil
+}
+
+func parseKinfoProc(buf []byte) (KinfoProc, error) {
+	var k KinfoProc
+	br := bytes.NewReader(buf)
+	err := common.Read(br, binary.LittleEndian, &k)
+	return k, err
+}
+
+func (p *Process) getKProc() (*KinfoProc, error) {
+	return p.getKProcWithContext(context.Background())
+}
+
+func (p *Process) getKProcWithContext(ctx context.Context) (*KinfoProc, error) {
+	mib := []int32{CTLKern, KernProc, KernProcPID, p.Pid}
+
+	buf, length, err := common.CallSyscall(mib)
+	if err != nil {
+		return nil, err
+	}
+	if length != sizeOfKinfoProc {
+		return nil, err
+	}
+
+	k, err := parseKinfoProc(buf)
+	if err != nil {
+		return nil, err
+	}
+	return &k, nil
+}

internal/gopsutil/process/process_freebsd_386.go

@@ -0,0 +1,192 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_freebsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 14
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 7
+)
+
+const (
+	sizeofPtr      = 0x4
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x4
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x488
+	sizeOfKinfoProc    = 0x300
+)
+
+const (
+	SIDL   = 1
+	SRUN   = 2
+	SSLEEP = 3
+	SSTOP  = 4
+	SZOMB  = 5
+	SWAIT  = 6
+	SLOCK  = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int32
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int32
+	Nsec int32
+}
+
+type Timeval struct {
+	Sec  int32
+	Usec int32
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int32
+	Ixrss    int32
+	Idrss    int32
+	Isrss    int32
+	Minflt   int32
+	Majflt   int32
+	Nswap    int32
+	Inblock  int32
+	Oublock  int32
+	Msgsnd   int32
+	Msgrcv   int32
+	Nsignals int32
+	Nvcsw    int32
+	Nivcsw   int32
+}
+
+type Rlimit struct {
+	Cur int64
+	Max int64
+}
+
+type KinfoProc struct {
+	Structsize   int32
+	Layout       int32
+	Args         int32 /* pargs */
+	Paddr        int32 /* proc */
+	Addr         int32 /* user */
+	Tracep       int32 /* vnode */
+	Textvp       int32 /* vnode */
+	Fd           int32 /* filedesc */
+	Vmspace      int32 /* vmspace */
+	Wchan        int32
+	Pid          int32
+	Ppid         int32
+	Pgid         int32
+	Tpgid        int32
+	Sid          int32
+	Tsid         int32
+	Jobc         int16
+	Spare_short1 int16
+	Tdev         uint32
+	Siglist      [16]byte /* sigset */
+	Sigmask      [16]byte /* sigset */
+	Sigignore    [16]byte /* sigset */
+	Sigcatch     [16]byte /* sigset */
+	Uid          uint32
+	Ruid         uint32
+	Svuid        uint32
+	Rgid         uint32
+	Svgid        uint32
+	Ngroups      int16
+	Spare_short2 int16
+	Groups       [16]uint32
+	Size         uint32
+	Rssize       int32
+	Swrss        int32
+	Tsize        int32
+	Dsize        int32
+	Ssize        int32
+	Xstat        uint16
+	Acflag       uint16
+	Pctcpu       uint32
+	Estcpu       uint32
+	Slptime      uint32
+	Swtime       uint32
+	Cow          uint32
+	Runtime      uint64
+	Start        Timeval
+	Childtime    Timeval
+	Flag         int32
+	Kiflag       int32
+	Traceflag    int32
+	Stat         int8
+	Nice         int8
+	Lock         int8
+	Rqindex      int8
+	Oncpu        uint8
+	Lastcpu      uint8
+	Tdname       [17]int8
+	Wmesg        [9]int8
+	Login        [18]int8
+	Lockname     [9]int8
+	Comm         [20]int8
+	Emul         [17]int8
+	Loginclass   [18]int8
+	Sparestrings [50]int8
+	Spareints    [7]int32
+	Flag2        int32
+	Fibnum       int32
+	Cr_flags     uint32
+	Jid          int32
+	Numthreads   int32
+	Tid          int32
+	Pri          Priority
+	Rusage       Rusage
+	Rusage_ch    Rusage
+	Pcb          int32 /* pcb */
+	Kstack       int32
+	Udata        int32
+	Tdaddr       int32 /* thread */
+	Spareptrs    [6]int32
+	Sparelongs   [12]int32
+	Sflag        int32
+	Tdflags      int32
+}
+
+type Priority struct {
+	Class  uint8
+	Level  uint8
+	Native uint8
+	User   uint8
+}
+
+type KinfoVmentry struct {
+	Structsize       int32
+	Type             int32
+	Start            uint64
+	End              uint64
+	Offset           uint64
+	Vn_fileid        uint64
+	Vn_fsid          uint32
+	Flags            int32
+	Resident         int32
+	Private_resident int32
+	Protection       int32
+	Ref_count        int32
+	Shadow_count     int32
+	Vn_type          int32
+	Vn_size          uint64
+	Vn_rdev          uint32
+	Vn_mode          uint16
+	Status           uint16
+	X_kve_ispare     [12]int32
+	Path             [1024]int8
+}

internal/gopsutil/process/process_freebsd_amd64.go

@@ -0,0 +1,192 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_freebsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 14
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 7
+)
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x488
+	sizeOfKinfoProc    = 0x440
+)
+
+const (
+	SIDL   = 1
+	SRUN   = 2
+	SSLEEP = 3
+	SSTOP  = 4
+	SZOMB  = 5
+	SWAIT  = 6
+	SLOCK  = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec  int64
+	Usec int64
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur int64
+	Max int64
+}
+
+type KinfoProc struct {
+	Structsize   int32
+	Layout       int32
+	Args         int64 /* pargs */
+	Paddr        int64 /* proc */
+	Addr         int64 /* user */
+	Tracep       int64 /* vnode */
+	Textvp       int64 /* vnode */
+	Fd           int64 /* filedesc */
+	Vmspace      int64 /* vmspace */
+	Wchan        int64
+	Pid          int32
+	Ppid         int32
+	Pgid         int32
+	Tpgid        int32
+	Sid          int32
+	Tsid         int32
+	Jobc         int16
+	Spare_short1 int16
+	Tdev         uint32
+	Siglist      [16]byte /* sigset */
+	Sigmask      [16]byte /* sigset */
+	Sigignore    [16]byte /* sigset */
+	Sigcatch     [16]byte /* sigset */
+	Uid          uint32
+	Ruid         uint32
+	Svuid        uint32
+	Rgid         uint32
+	Svgid        uint32
+	Ngroups      int16
+	Spare_short2 int16
+	Groups       [16]uint32
+	Size         uint64
+	Rssize       int64
+	Swrss        int64
+	Tsize        int64
+	Dsize        int64
+	Ssize        int64
+	Xstat        uint16
+	Acflag       uint16
+	Pctcpu       uint32
+	Estcpu       uint32
+	Slptime      uint32
+	Swtime       uint32
+	Cow          uint32
+	Runtime      uint64
+	Start        Timeval
+	Childtime    Timeval
+	Flag         int64
+	Kiflag       int64
+	Traceflag    int32
+	Stat         int8
+	Nice         int8
+	Lock         int8
+	Rqindex      int8
+	Oncpu        uint8
+	Lastcpu      uint8
+	Tdname       [17]int8
+	Wmesg        [9]int8
+	Login        [18]int8
+	Lockname     [9]int8
+	Comm         [20]int8
+	Emul         [17]int8
+	Loginclass   [18]int8
+	Sparestrings [50]int8
+	Spareints    [7]int32
+	Flag2        int32
+	Fibnum       int32
+	Cr_flags     uint32
+	Jid          int32
+	Numthreads   int32
+	Tid          int32
+	Pri          Priority
+	Rusage       Rusage
+	Rusage_ch    Rusage
+	Pcb          int64 /* pcb */
+	Kstack       int64
+	Udata        int64
+	Tdaddr       int64 /* thread */
+	Spareptrs    [6]int64
+	Sparelongs   [12]int64
+	Sflag        int64
+	Tdflags      int64
+}
+
+type Priority struct {
+	Class  uint8
+	Level  uint8
+	Native uint8
+	User   uint8
+}
+
+type KinfoVmentry struct {
+	Structsize       int32
+	Type             int32
+	Start            uint64
+	End              uint64
+	Offset           uint64
+	Vn_fileid        uint64
+	Vn_fsid          uint32
+	Flags            int32
+	Resident         int32
+	Private_resident int32
+	Protection       int32
+	Ref_count        int32
+	Shadow_count     int32
+	Vn_type          int32
+	Vn_size          uint64
+	Vn_rdev          uint32
+	Vn_mode          uint16
+	Status           uint16
+	X_kve_ispare     [12]int32
+	Path             [1024]int8
+}

internal/gopsutil/process/process_freebsd_arm.go

@@ -0,0 +1,192 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_freebsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 14
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 7
+)
+
+const (
+	sizeofPtr      = 0x4
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x4
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x488
+	sizeOfKinfoProc    = 0x440
+)
+
+const (
+	SIDL   = 1
+	SRUN   = 2
+	SSLEEP = 3
+	SSTOP  = 4
+	SZOMB  = 5
+	SWAIT  = 6
+	SLOCK  = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int32
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec  int64
+	Usec int64
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int32
+	Ixrss    int32
+	Idrss    int32
+	Isrss    int32
+	Minflt   int32
+	Majflt   int32
+	Nswap    int32
+	Inblock  int32
+	Oublock  int32
+	Msgsnd   int32
+	Msgrcv   int32
+	Nsignals int32
+	Nvcsw    int32
+	Nivcsw   int32
+}
+
+type Rlimit struct {
+	Cur int32
+	Max int32
+}
+
+type KinfoProc struct {
+	Structsize   int32
+	Layout       int32
+	Args         int32 /* pargs */
+	Paddr        int32 /* proc */
+	Addr         int32 /* user */
+	Tracep       int32 /* vnode */
+	Textvp       int32 /* vnode */
+	Fd           int32 /* filedesc */
+	Vmspace      int32 /* vmspace */
+	Wchan        int32
+	Pid          int32
+	Ppid         int32
+	Pgid         int32
+	Tpgid        int32
+	Sid          int32
+	Tsid         int32
+	Jobc         int16
+	Spare_short1 int16
+	Tdev         uint32
+	Siglist      [16]byte /* sigset */
+	Sigmask      [16]byte /* sigset */
+	Sigignore    [16]byte /* sigset */
+	Sigcatch     [16]byte /* sigset */
+	Uid          uint32
+	Ruid         uint32
+	Svuid        uint32
+	Rgid         uint32
+	Svgid        uint32
+	Ngroups      int16
+	Spare_short2 int16
+	Groups       [16]uint32
+	Size         uint32
+	Rssize       int32
+	Swrss        int32
+	Tsize        int32
+	Dsize        int32
+	Ssize        int32
+	Xstat        uint16
+	Acflag       uint16
+	Pctcpu       uint32
+	Estcpu       uint32
+	Slptime      uint32
+	Swtime       uint32
+	Cow          uint32
+	Runtime      uint64
+	Start        Timeval
+	Childtime    Timeval
+	Flag         int32
+	Kiflag       int32
+	Traceflag    int32
+	Stat         int8
+	Nice         int8
+	Lock         int8
+	Rqindex      int8
+	Oncpu        uint8
+	Lastcpu      uint8
+	Tdname       [17]int8
+	Wmesg        [9]int8
+	Login        [18]int8
+	Lockname     [9]int8
+	Comm         [20]int8
+	Emul         [17]int8
+	Loginclass   [18]int8
+	Sparestrings [50]int8
+	Spareints    [4]int32
+	Flag2        int32
+	Fibnum       int32
+	Cr_flags     uint32
+	Jid          int32
+	Numthreads   int32
+	Tid          int32
+	Pri          Priority
+	Rusage       Rusage
+	Rusage_ch    Rusage
+	Pcb          int32 /* pcb */
+	Kstack       int32
+	Udata        int32
+	Tdaddr       int32 /* thread */
+	Spareptrs    [6]int64
+	Sparelongs   [12]int64
+	Sflag        int64
+	Tdflags      int64
+}
+
+type Priority struct {
+	Class  uint8
+	Level  uint8
+	Native uint8
+	User   uint8
+}
+
+type KinfoVmentry struct {
+	Structsize       int32
+	Type             int32
+	Start            uint64
+	End              uint64
+	Offset           uint64
+	Vn_fileid        uint64
+	Vn_fsid          uint32
+	Flags            int32
+	Resident         int32
+	Private_resident int32
+	Protection       int32
+	Ref_count        int32
+	Shadow_count     int32
+	Vn_type          int32
+	Vn_size          uint64
+	Vn_rdev          uint32
+	Vn_mode          uint16
+	Status           uint16
+	X_kve_ispare     [12]int32
+	Path             [1024]int8
+}

internal/gopsutil/process/process_freebsd_arm64.go

@@ -0,0 +1,201 @@
+//go:build freebsd && arm64
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs process/types_freebsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 14
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 7
+)
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x488
+	sizeOfKinfoProc    = 0x440
+)
+
+const (
+	SIDL   = 1
+	SRUN   = 2
+	SSLEEP = 3
+	SSTOP  = 4
+	SZOMB  = 5
+	SWAIT  = 6
+	SLOCK  = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec  int64
+	Usec int64
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur int64
+	Max int64
+}
+
+type KinfoProc struct {
+	Structsize     int32
+	Layout         int32
+	Args           *int64 /* pargs */
+	Paddr          *int64 /* proc */
+	Addr           *int64 /* user */
+	Tracep         *int64 /* vnode */
+	Textvp         *int64 /* vnode */
+	Fd             *int64 /* filedesc */
+	Vmspace        *int64 /* vmspace */
+	Wchan          *byte
+	Pid            int32
+	Ppid           int32
+	Pgid           int32
+	Tpgid          int32
+	Sid            int32
+	Tsid           int32
+	Jobc           int16
+	Spare_short1   int16
+	Tdev_freebsd11 uint32
+	Siglist        [16]byte /* sigset */
+	Sigmask        [16]byte /* sigset */
+	Sigignore      [16]byte /* sigset */
+	Sigcatch       [16]byte /* sigset */
+	Uid            uint32
+	Ruid           uint32
+	Svuid          uint32
+	Rgid           uint32
+	Svgid          uint32
+	Ngroups        int16
+	Spare_short2   int16
+	Groups         [16]uint32
+	Size           uint64
+	Rssize         int64
+	Swrss          int64
+	Tsize          int64
+	Dsize          int64
+	Ssize          int64
+	Xstat          uint16
+	Acflag         uint16
+	Pctcpu         uint32
+	Estcpu         uint32
+	Slptime        uint32
+	Swtime         uint32
+	Cow            uint32
+	Runtime        uint64
+	Start          Timeval
+	Childtime      Timeval
+	Flag           int64
+	Kiflag         int64
+	Traceflag      int32
+	Stat           uint8
+	Nice           int8
+	Lock           uint8
+	Rqindex        uint8
+	Oncpu_old      uint8
+	Lastcpu_old    uint8
+	Tdname         [17]uint8
+	Wmesg          [9]uint8
+	Login          [18]uint8
+	Lockname       [9]uint8
+	Comm           [20]int8
+	Emul           [17]uint8
+	Loginclass     [18]uint8
+	Moretdname     [4]uint8
+	Sparestrings   [46]uint8
+	Spareints      [2]int32
+	Tdev           uint64
+	Oncpu          int32
+	Lastcpu        int32
+	Tracer         int32
+	Flag2          int32
+	Fibnum         int32
+	Cr_flags       uint32
+	Jid            int32
+	Numthreads     int32
+	Tid            int32
+	Pri            Priority
+	Rusage         Rusage
+	Rusage_ch      Rusage
+	Pcb            *int64 /* pcb */
+	Kstack         *byte
+	Udata          *byte
+	Tdaddr         *int64 /* thread */
+	Spareptrs      [6]*byte
+	Sparelongs     [12]int64
+	Sflag          int64
+	Tdflags        int64
+}
+
+type Priority struct {
+	Class  uint8
+	Level  uint8
+	Native uint8
+	User   uint8
+}
+
+type KinfoVmentry struct {
+	Structsize        int32
+	Type              int32
+	Start             uint64
+	End               uint64
+	Offset            uint64
+	Vn_fileid         uint64
+	Vn_fsid_freebsd11 uint32
+	Flags             int32
+	Resident          int32
+	Private_resident  int32
+	Protection        int32
+	Ref_count         int32
+	Shadow_count      int32
+	Vn_type           int32
+	Vn_size           uint64
+	Vn_rdev_freebsd11 uint32
+	Vn_mode           uint16
+	Status            uint16
+	Vn_fsid           uint64
+	Vn_rdev           uint64
+	X_kve_ispare      [8]int32
+	Path              [1024]uint8
+}

internal/gopsutil/process/process_openbsd.go

@@ -0,0 +1,570 @@
+//go:build openbsd
+
+package process
+
+import (
+	"C"
+	"bytes"
+	"context"
+	"encoding/binary"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+	cpu "github.com/gofiber/fiber/v2/internal/gopsutil/cpu"
+	mem "github.com/gofiber/fiber/v2/internal/gopsutil/mem"
+	net "github.com/gofiber/fiber/v2/internal/gopsutil/net"
+)
+
+// MemoryInfoExStat is different between OSes
+type MemoryInfoExStat struct{}
+
+type MemoryMapsStat struct{}
+
+func pidsWithContext(ctx context.Context) ([]int32, error) {
+	var ret []int32
+	procs, err := Processes()
+	if err != nil {
+		return ret, nil
+	}
+
+	for _, p := range procs {
+		ret = append(ret, p.Pid)
+	}
+
+	return ret, nil
+}
+
+func (p *Process) Ppid() (int32, error) {
+	return p.PpidWithContext(context.Background())
+}
+
+func (p *Process) PpidWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+
+	return k.Ppid, nil
+}
+
+func (p *Process) Name() (string, error) {
+	return p.NameWithContext(context.Background())
+}
+
+func (p *Process) NameWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+	name := common.IntToString(k.Comm[:])
+
+	if len(name) >= 15 {
+		cmdlineSlice, err := p.CmdlineSliceWithContext(ctx)
+		if err != nil {
+			return "", err
+		}
+		if len(cmdlineSlice) > 0 {
+			extendedName := filepath.Base(cmdlineSlice[0])
+			if strings.HasPrefix(extendedName, p.name) {
+				name = extendedName
+			} else {
+				name = cmdlineSlice[0]
+			}
+		}
+	}
+
+	return name, nil
+}
+
+func (p *Process) Tgid() (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Exe() (string, error) {
+	return p.ExeWithContext(context.Background())
+}
+
+func (p *Process) ExeWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) CmdlineSlice() ([]string, error) {
+	return p.CmdlineSliceWithContext(context.Background())
+}
+
+func (p *Process) CmdlineSliceWithContext(ctx context.Context) ([]string, error) {
+	mib := []int32{CTLKern, KernProcArgs, p.Pid, KernProcArgv}
+	buf, _, err := common.CallSyscall(mib)
+	if err != nil {
+		return nil, err
+	}
+
+	argc := 0
+	argvp := unsafe.Pointer(&buf[0])
+	argv := *(**C.char)(unsafe.Pointer(argvp))
+	size := unsafe.Sizeof(argv)
+	var strParts []string
+
+	for argv != nil {
+		strParts = append(strParts, C.GoString(argv))
+
+		argc++
+		argv = *(**C.char)(unsafe.Pointer(uintptr(argvp) + uintptr(argc)*size))
+	}
+	return strParts, nil
+}
+
+func (p *Process) Cmdline() (string, error) {
+	return p.CmdlineWithContext(context.Background())
+}
+
+func (p *Process) CmdlineWithContext(ctx context.Context) (string, error) {
+	argv, err := p.CmdlineSlice()
+	if err != nil {
+		return "", err
+	}
+	return strings.Join(argv, " "), nil
+}
+
+func (p *Process) createTimeWithContext(ctx context.Context) (int64, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Cwd() (string, error) {
+	return p.CwdWithContext(context.Background())
+}
+
+func (p *Process) CwdWithContext(ctx context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) Parent() (*Process, error) {
+	return p.ParentWithContext(context.Background())
+}
+
+func (p *Process) ParentWithContext(ctx context.Context) (*Process, error) {
+	return p, common.ErrNotImplementedError
+}
+
+func (p *Process) Status() (string, error) {
+	return p.StatusWithContext(context.Background())
+}
+
+func (p *Process) StatusWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+	var s string
+	switch k.Stat {
+	case SIDL:
+	case SRUN:
+	case SONPROC:
+		s = "R"
+	case SSLEEP:
+		s = "S"
+	case SSTOP:
+		s = "T"
+	case SDEAD:
+		s = "Z"
+	}
+
+	return s, nil
+}
+
+func (p *Process) Foreground() (bool, error) {
+	return p.ForegroundWithContext(context.Background())
+}
+
+func (p *Process) ForegroundWithContext(ctx context.Context) (bool, error) {
+	// see https://github.com/shirou/gopsutil/issues/596#issuecomment-432707831 for implementation details
+	pid := p.Pid
+	ps, err := exec.LookPath("ps")
+	if err != nil {
+		return false, err
+	}
+	out, err := invoke.CommandWithContext(ctx, ps, "-o", "stat=", "-p", strconv.Itoa(int(pid)))
+	if err != nil {
+		return false, err
+	}
+	return strings.IndexByte(string(out), '+') != -1, nil
+}
+
+func (p *Process) Uids() ([]int32, error) {
+	return p.UidsWithContext(context.Background())
+}
+
+func (p *Process) UidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	uids := make([]int32, 0, 3)
+
+	uids = append(uids, int32(k.Ruid), int32(k.Uid), int32(k.Svuid))
+
+	return uids, nil
+}
+
+func (p *Process) Gids() ([]int32, error) {
+	return p.GidsWithContext(context.Background())
+}
+
+func (p *Process) GidsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	gids := make([]int32, 0, 3)
+	gids = append(gids, int32(k.Rgid), int32(k.Ngroups), int32(k.Svgid))
+
+	return gids, nil
+}
+
+func (p *Process) GroupsWithContext(ctx context.Context) ([]int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+
+	return k.Groups, nil
+}
+
+func (p *Process) Terminal() (string, error) {
+	return p.TerminalWithContext(context.Background())
+}
+
+func (p *Process) TerminalWithContext(ctx context.Context) (string, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return "", err
+	}
+
+	ttyNr := uint64(k.Tdev)
+
+	termmap, err := getTerminalMap()
+	if err != nil {
+		return "", err
+	}
+
+	return termmap[ttyNr], nil
+}
+
+func (p *Process) Nice() (int32, error) {
+	return p.NiceWithContext(context.Background())
+}
+
+func (p *Process) NiceWithContext(ctx context.Context) (int32, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return 0, err
+	}
+	return int32(k.Nice), nil
+}
+
+func (p *Process) IOnice() (int32, error) {
+	return p.IOniceWithContext(context.Background())
+}
+
+func (p *Process) IOniceWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) Rlimit() ([]RlimitStat, error) {
+	return p.RlimitWithContext(context.Background())
+}
+
+func (p *Process) RlimitWithContext(ctx context.Context) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) RlimitUsage(gatherUsed bool) ([]RlimitStat, error) {
+	return p.RlimitUsageWithContext(context.Background(), gatherUsed)
+}
+
+func (p *Process) RlimitUsageWithContext(ctx context.Context, gatherUsed bool) ([]RlimitStat, error) {
+	var rlimit []RlimitStat
+	return rlimit, common.ErrNotImplementedError
+}
+
+func (p *Process) IOCounters() (*IOCountersStat, error) {
+	return p.IOCountersWithContext(context.Background())
+}
+
+func (p *Process) IOCountersWithContext(ctx context.Context) (*IOCountersStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	return &IOCountersStat{
+		ReadCount:  uint64(k.Uru_inblock),
+		WriteCount: uint64(k.Uru_oublock),
+	}, nil
+}
+
+func (p *Process) NumCtxSwitches() (*NumCtxSwitchesStat, error) {
+	return p.NumCtxSwitchesWithContext(context.Background())
+}
+
+func (p *Process) NumCtxSwitchesWithContext(ctx context.Context) (*NumCtxSwitchesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) NumFDs() (int32, error) {
+	return p.NumFDsWithContext(context.Background())
+}
+
+func (p *Process) NumFDsWithContext(ctx context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) NumThreads() (int32, error) {
+	return p.NumThreadsWithContext(context.Background())
+}
+
+func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
+	/* not supported, just return 1 */
+	return 1, nil
+}
+
+func (p *Process) Threads() (map[int32]*cpu.TimesStat, error) {
+	return p.ThreadsWithContext(context.Background())
+}
+
+func (p *Process) ThreadsWithContext(ctx context.Context) (map[int32]*cpu.TimesStat, error) {
+	ret := make(map[int32]*cpu.TimesStat)
+	return ret, common.ErrNotImplementedError
+}
+
+func (p *Process) Times() (*cpu.TimesStat, error) {
+	return p.TimesWithContext(context.Background())
+}
+
+func (p *Process) TimesWithContext(ctx context.Context) (*cpu.TimesStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	return &cpu.TimesStat{
+		CPU:    "cpu",
+		User:   float64(k.Uutime_sec) + float64(k.Uutime_usec)/1000000,
+		System: float64(k.Ustime_sec) + float64(k.Ustime_usec)/1000000,
+	}, nil
+}
+
+func (p *Process) CPUAffinity() ([]int32, error) {
+	return p.CPUAffinityWithContext(context.Background())
+}
+
+func (p *Process) CPUAffinityWithContext(ctx context.Context) ([]int32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfo() (*MemoryInfoStat, error) {
+	return p.MemoryInfoWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoWithContext(ctx context.Context) (*MemoryInfoStat, error) {
+	k, err := p.getKProc()
+	if err != nil {
+		return nil, err
+	}
+	pageSize, err := mem.GetPageSize()
+	if err != nil {
+		return nil, err
+	}
+
+	return &MemoryInfoStat{
+		RSS: uint64(k.Vm_rssize) * pageSize,
+		VMS: uint64(k.Vm_tsize) + uint64(k.Vm_dsize) +
+			uint64(k.Vm_ssize),
+	}, nil
+}
+
+func (p *Process) MemoryInfoEx() (*MemoryInfoExStat, error) {
+	return p.MemoryInfoExWithContext(context.Background())
+}
+
+func (p *Process) MemoryInfoExWithContext(ctx context.Context) (*MemoryInfoExStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) PageFaults() (*PageFaultsStat, error) {
+	return p.PageFaultsWithContext(context.Background())
+}
+
+func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Children() ([]*Process, error) {
+	return p.ChildrenWithContext(context.Background())
+}
+
+func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
+	pids, err := common.CallPgrepWithContext(ctx, invoke, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]*Process, 0, len(pids))
+	for _, pid := range pids {
+		np, err := NewProcess(pid)
+		if err != nil {
+			return nil, err
+		}
+		ret = append(ret, np)
+	}
+	return ret, nil
+}
+
+func (p *Process) OpenFiles() ([]OpenFilesStat, error) {
+	return p.OpenFilesWithContext(context.Background())
+}
+
+func (p *Process) OpenFilesWithContext(ctx context.Context) ([]OpenFilesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) Connections() ([]net.ConnectionStat, error) {
+	return p.ConnectionsWithContext(context.Background())
+}
+
+func (p *Process) ConnectionsWithContext(ctx context.Context) ([]net.ConnectionStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) ConnectionsMax(max int) ([]net.ConnectionStat, error) {
+	return p.ConnectionsMaxWithContext(context.Background(), max)
+}
+
+func (p *Process) ConnectionsMaxWithContext(ctx context.Context, max int) ([]net.ConnectionStat, error) {
+	return []net.ConnectionStat{}, common.ErrNotImplementedError
+}
+
+func (p *Process) NetIOCounters(pernic bool) ([]net.IOCountersStat, error) {
+	return p.NetIOCountersWithContext(context.Background(), pernic)
+}
+
+func (p *Process) NetIOCountersWithContext(ctx context.Context, pernic bool) ([]net.IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
+	return p.MemoryMapsWithContext(context.Background(), grouped)
+}
+
+func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]MemoryMapsStat, error) {
+	var ret []MemoryMapsStat
+	return &ret, common.ErrNotImplementedError
+}
+
+func Processes() ([]*Process, error) {
+	return ProcessesWithContext(context.Background())
+}
+
+func ProcessesWithContext(ctx context.Context) ([]*Process, error) {
+	results := []*Process{}
+
+	buf, length, err := CallKernProcSyscall(KernProcAll, 0)
+	if err != nil {
+		return results, err
+	}
+
+	// get kinfo_proc size
+	count := int(length / uint64(sizeOfKinfoProc))
+
+	// parse buf to procs
+	for i := 0; i < count; i++ {
+		b := buf[i*sizeOfKinfoProc : (i+1)*sizeOfKinfoProc]
+		k, err := parseKinfoProc(b)
+		if err != nil {
+			continue
+		}
+		p, err := NewProcess(int32(k.Pid))
+		if err != nil {
+			continue
+		}
+
+		results = append(results, p)
+	}
+
+	return results, nil
+}
+
+func parseKinfoProc(buf []byte) (KinfoProc, error) {
+	var k KinfoProc
+	br := bytes.NewReader(buf)
+	err := common.Read(br, binary.LittleEndian, &k)
+	return k, err
+}
+
+func (p *Process) getKProc() (*KinfoProc, error) {
+	return p.getKProcWithContext(context.Background())
+}
+
+func (p *Process) getKProcWithContext(ctx context.Context) (*KinfoProc, error) {
+	buf, length, err := CallKernProcSyscall(KernProcPID, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	if length != sizeOfKinfoProc {
+		return nil, err
+	}
+
+	k, err := parseKinfoProc(buf)
+	if err != nil {
+		return nil, err
+	}
+	return &k, nil
+}
+
+func CallKernProcSyscall(op, arg int32) ([]byte, uint64, error) {
+	return CallKernProcSyscallWithContext(context.Background(), op, arg)
+}
+
+func CallKernProcSyscallWithContext(ctx context.Context, op, arg int32) ([]byte, uint64, error) {
+	mib := []int32{CTLKern, KernProc, op, arg, sizeOfKinfoProc, 0}
+	mibptr := unsafe.Pointer(&mib[0])
+	miblen := uint64(len(mib))
+	length := uint64(0)
+	_, _, err := unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		0,
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return nil, length, err
+	}
+
+	count := int32(length / uint64(sizeOfKinfoProc))
+	mib = []int32{CTLKern, KernProc, op, arg, sizeOfKinfoProc, count}
+	mibptr = unsafe.Pointer(&mib[0])
+	miblen = uint64(len(mib))
+	// get proc info itself
+	buf := make([]byte, length)
+	_, _, err = unix.Syscall6(
+		unix.SYS___SYSCTL,
+		uintptr(mibptr),
+		uintptr(miblen),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return buf, length, err
+	}
+
+	return buf, length, nil
+}

internal/gopsutil/process/process_openbsd_386.go

@@ -0,0 +1,201 @@
+//go:build openbsd && 386
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs process/types_openbsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 66
+	KernProcAll      = 0
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 55
+	KernProcArgv     = 1
+	KernProcEnv      = 3
+)
+
+const (
+	ArgMax = 256 * 1024
+)
+
+const (
+	sizeofPtr      = 0x4
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x4
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x38
+	sizeOfKinfoProc    = 0x264
+)
+
+const (
+	SIDL    = 1
+	SRUN    = 2
+	SSLEEP  = 3
+	SSTOP   = 4
+	SZOMB   = 5
+	SDEAD   = 6
+	SONPROC = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int32
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int32
+}
+
+type Timeval struct {
+	Sec  int64
+	Usec int32
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int32
+	Ixrss    int32
+	Idrss    int32
+	Isrss    int32
+	Minflt   int32
+	Majflt   int32
+	Nswap    int32
+	Inblock  int32
+	Oublock  int32
+	Msgsnd   int32
+	Msgrcv   int32
+	Nsignals int32
+	Nvcsw    int32
+	Nivcsw   int32
+}
+
+type Rlimit struct {
+	Cur uint64
+	Max uint64
+}
+
+type KinfoProc struct {
+	Forw         uint64
+	Back         uint64
+	Paddr        uint64
+	Addr         uint64
+	Fd           uint64
+	Stats        uint64
+	Limit        uint64
+	Vmspace      uint64
+	Sigacts      uint64
+	Sess         uint64
+	Tsess        uint64
+	Ru           uint64
+	Eflag        int32
+	Exitsig      int32
+	Flag         int32
+	Pid          int32
+	Ppid         int32
+	Sid          int32
+	X_pgid       int32
+	Tpgid        int32
+	Uid          uint32
+	Ruid         uint32
+	Gid          uint32
+	Rgid         uint32
+	Groups       [16]uint32
+	Ngroups      int16
+	Jobc         int16
+	Tdev         uint32
+	Estcpu       uint32
+	Rtime_sec    uint32
+	Rtime_usec   uint32
+	Cpticks      int32
+	Pctcpu       uint32
+	Swtime       uint32
+	Slptime      uint32
+	Schedflags   int32
+	Uticks       uint64
+	Sticks       uint64
+	Iticks       uint64
+	Tracep       uint64
+	Traceflag    int32
+	Holdcnt      int32
+	Siglist      int32
+	Sigmask      uint32
+	Sigignore    uint32
+	Sigcatch     uint32
+	Stat         int8
+	Priority     uint8
+	Usrpri       uint8
+	Nice         uint8
+	Xstat        uint16
+	Acflag       uint16
+	Comm         [24]int8
+	Wmesg        [8]int8
+	Wchan        uint64
+	Login        [32]int8
+	Vm_rssize    int32
+	Vm_tsize     int32
+	Vm_dsize     int32
+	Vm_ssize     int32
+	Uvalid       int64
+	Ustart_sec   uint64
+	Ustart_usec  uint32
+	Uutime_sec   uint32
+	Uutime_usec  uint32
+	Ustime_sec   uint32
+	Ustime_usec  uint32
+	Uru_maxrss   uint64
+	Uru_ixrss    uint64
+	Uru_idrss    uint64
+	Uru_isrss    uint64
+	Uru_minflt   uint64
+	Uru_majflt   uint64
+	Uru_nswap    uint64
+	Uru_inblock  uint64
+	Uru_oublock  uint64
+	Uru_msgsnd   uint64
+	Uru_msgrcv   uint64
+	Uru_nsignals uint64
+	Uru_nvcsw    uint64
+	Uru_nivcsw   uint64
+	Uctime_sec   uint32
+	Uctime_usec  uint32
+	Psflags      int32
+	Spare        int32
+	Svuid        uint32
+	Svgid        uint32
+	Emul         [8]int8
+	Rlim_rss_cur uint64
+	Cpuid        uint64
+	Vm_map_size  uint64
+	Tid          int32
+	Rtableid     uint32
+}
+
+type Priority struct{}
+
+type KinfoVmentry struct {
+	Start          uint32
+	End            uint32
+	Guard          uint32
+	Fspace         uint32
+	Fspace_augment uint32
+	Offset         uint64
+	Wired_count    int32
+	Etype          int32
+	Protection     int32
+	Max_protection int32
+	Advice         int32
+	Inheritance    int32
+	Flags          uint8
+	Pad_cgo_0      [3]byte
+}

internal/gopsutil/process/process_openbsd_amd64.go

@@ -0,0 +1,200 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types_openbsd.go
+
+package process
+
+const (
+	CTLKern          = 1
+	KernProc         = 66
+	KernProcAll      = 0
+	KernProcPID      = 1
+	KernProcProc     = 8
+	KernProcPathname = 12
+	KernProcArgs     = 55
+	KernProcArgv     = 1
+	KernProcEnv      = 3
+)
+
+const (
+	ArgMax = 256 * 1024
+)
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+const (
+	sizeOfKinfoVmentry = 0x50
+	sizeOfKinfoProc    = 0x268
+)
+
+const (
+	SIDL    = 1
+	SRUN    = 2
+	SSLEEP  = 3
+	SSTOP   = 4
+	SZOMB   = 5
+	SDEAD   = 6
+	SONPROC = 7
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type Timespec struct {
+	Sec  int64
+	Nsec int64
+}
+
+type Timeval struct {
+	Sec  int64
+	Usec int64
+}
+
+type Rusage struct {
+	Utime    Timeval
+	Stime    Timeval
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
+
+type Rlimit struct {
+	Cur uint64
+	Max uint64
+}
+
+type KinfoProc struct {
+	Forw         uint64
+	Back         uint64
+	Paddr        uint64
+	Addr         uint64
+	Fd           uint64
+	Stats        uint64
+	Limit        uint64
+	Vmspace      uint64
+	Sigacts      uint64
+	Sess         uint64
+	Tsess        uint64
+	Ru           uint64
+	Eflag        int32
+	Exitsig      int32
+	Flag         int32
+	Pid          int32
+	Ppid         int32
+	Sid          int32
+	X_pgid       int32
+	Tpgid        int32
+	Uid          uint32
+	Ruid         uint32
+	Gid          uint32
+	Rgid         uint32
+	Groups       [16]uint32
+	Ngroups      int16
+	Jobc         int16
+	Tdev         uint32
+	Estcpu       uint32
+	Rtime_sec    uint32
+	Rtime_usec   uint32
+	Cpticks      int32
+	Pctcpu       uint32
+	Swtime       uint32
+	Slptime      uint32
+	Schedflags   int32
+	Uticks       uint64
+	Sticks       uint64
+	Iticks       uint64
+	Tracep       uint64
+	Traceflag    int32
+	Holdcnt      int32
+	Siglist      int32
+	Sigmask      uint32
+	Sigignore    uint32
+	Sigcatch     uint32
+	Stat         int8
+	Priority     uint8
+	Usrpri       uint8
+	Nice         uint8
+	Xstat        uint16
+	Acflag       uint16
+	Comm         [24]int8
+	Wmesg        [8]int8
+	Wchan        uint64
+	Login        [32]int8
+	Vm_rssize    int32
+	Vm_tsize     int32
+	Vm_dsize     int32
+	Vm_ssize     int32
+	Uvalid       int64
+	Ustart_sec   uint64
+	Ustart_usec  uint32
+	Uutime_sec   uint32
+	Uutime_usec  uint32
+	Ustime_sec   uint32
+	Ustime_usec  uint32
+	Pad_cgo_0    [4]byte
+	Uru_maxrss   uint64
+	Uru_ixrss    uint64
+	Uru_idrss    uint64
+	Uru_isrss    uint64
+	Uru_minflt   uint64
+	Uru_majflt   uint64
+	Uru_nswap    uint64
+	Uru_inblock  uint64
+	Uru_oublock  uint64
+	Uru_msgsnd   uint64
+	Uru_msgrcv   uint64
+	Uru_nsignals uint64
+	Uru_nvcsw    uint64
+	Uru_nivcsw   uint64
+	Uctime_sec   uint32
+	Uctime_usec  uint32
+	Psflags      int32
+	Spare        int32
+	Svuid        uint32
+	Svgid        uint32
+	Emul         [8]int8
+	Rlim_rss_cur uint64
+	Cpuid        uint64
+	Vm_map_size  uint64
+	Tid          int32
+	Rtableid     uint32
+}
+
+type Priority struct{}
+
+type KinfoVmentry struct {
+	Start          uint64
+	End            uint64
+	Guard          uint64
+	Fspace         uint64
+	Fspace_augment uint64
+	Offset         uint64
+	Wired_count    int32
+	Etype          int32
+	Protection     int32
+	Max_protection int32
+	Advice         int32
+	Inheritance    int32
+	Flags          uint8
+	Pad_cgo_0      [7]byte
+}

internal/gopsutil/process/process_posix.go

@@ -0,0 +1,194 @@
+//go:build linux || freebsd || openbsd || darwin
+
+package process
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+// POSIX
+func getTerminalMap() (map[uint64]string, error) {
+	ret := make(map[uint64]string)
+	var termfiles []string
+
+	d, err := os.Open("/dev")
+	if err != nil {
+		return nil, err
+	}
+	defer d.Close()
+
+	devnames, err := d.Readdirnames(-1)
+	if err != nil {
+		return nil, err
+	}
+	for _, devname := range devnames {
+		if strings.HasPrefix(devname, "/dev/tty") {
+			termfiles = append(termfiles, "/dev/tty/"+devname)
+		}
+	}
+
+	var ptsnames []string
+	ptsd, err := os.Open("/dev/pts")
+	if err != nil {
+		ptsnames, _ = filepath.Glob("/dev/ttyp*")
+		if ptsnames == nil {
+			return nil, err
+		}
+	}
+	defer ptsd.Close()
+
+	if ptsnames == nil {
+		defer ptsd.Close()
+		ptsnames, err = ptsd.Readdirnames(-1)
+		if err != nil {
+			return nil, err
+		}
+		for _, ptsname := range ptsnames {
+			termfiles = append(termfiles, "/dev/pts/"+ptsname)
+		}
+	} else {
+		termfiles = ptsnames
+	}
+
+	for _, name := range termfiles {
+		stat := unix.Stat_t{}
+		if err = unix.Stat(name, &stat); err != nil {
+			return nil, err
+		}
+		rdev := uint64(stat.Rdev)
+		ret[rdev] = strings.Replace(name, "/dev", "", -1)
+	}
+	return ret, nil
+}
+
+func PidExistsWithContext(ctx context.Context, pid int32) (bool, error) {
+	if pid <= 0 {
+		return false, fmt.Errorf("invalid pid %v", pid)
+	}
+	proc, err := os.FindProcess(int(pid))
+	if err != nil {
+		return false, err
+	}
+
+	if _, err := os.Stat(common.HostProc()); err == nil { // Means that proc filesystem exist
+		// Checking PID existence based on existence of /<HOST_PROC>/proc/<PID> folder
+		// This covers the case when running inside container with a different process namespace (by default)
+
+		_, err := os.Stat(common.HostProc(strconv.Itoa(int(pid))))
+		if errors.Is(err, fs.ErrNotExist) {
+			return false, nil
+		}
+		return err == nil, err
+	}
+
+	//'/proc' filesystem is not exist, checking of PID existence is done via signalling the process
+	//Make sense only if we run in the same process namespace
+	err = proc.Signal(syscall.Signal(0))
+	if err == nil {
+		return true, nil
+	}
+	if err.Error() == "os: process already finished" {
+		return false, nil
+	}
+	errno, ok := err.(syscall.Errno)
+	if !ok {
+		return false, err
+	}
+	switch errno {
+	case syscall.ESRCH:
+		return false, nil
+	case syscall.EPERM:
+		return true, nil
+	}
+
+	return false, err
+}
+
+// SendSignal sends a unix.Signal to the process.
+// Currently, SIGSTOP, SIGCONT, SIGTERM and SIGKILL are supported.
+func (p *Process) SendSignal(sig syscall.Signal) error {
+	return p.SendSignalWithContext(context.Background(), sig)
+}
+
+func (p *Process) SendSignalWithContext(ctx context.Context, sig syscall.Signal) error {
+	process, err := os.FindProcess(int(p.Pid))
+	if err != nil {
+		return err
+	}
+
+	err = process.Signal(sig)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Suspend sends SIGSTOP to the process.
+func (p *Process) Suspend() error {
+	return p.SuspendWithContext(context.Background())
+}
+
+func (p *Process) SuspendWithContext(ctx context.Context) error {
+	return p.SendSignal(unix.SIGSTOP)
+}
+
+// Resume sends SIGCONT to the process.
+func (p *Process) Resume() error {
+	return p.ResumeWithContext(context.Background())
+}
+
+func (p *Process) ResumeWithContext(ctx context.Context) error {
+	return p.SendSignal(unix.SIGCONT)
+}
+
+// Terminate sends SIGTERM to the process.
+func (p *Process) Terminate() error {
+	return p.TerminateWithContext(context.Background())
+}
+
+func (p *Process) TerminateWithContext(ctx context.Context) error {
+	return p.SendSignal(unix.SIGTERM)
+}
+
+// Kill sends SIGKILL to the process.
+func (p *Process) Kill() error {
+	return p.KillWithContext(context.Background())
+}
+
+func (p *Process) KillWithContext(ctx context.Context) error {
+	return p.SendSignal(unix.SIGKILL)
+}
+
+// Username returns a username of the process.
+func (p *Process) Username() (string, error) {
+	return p.UsernameWithContext(context.Background())
+}
+
+func (p *Process) UsernameWithContext(ctx context.Context) (string, error) {
+	uids, err := p.Uids()
+	if err != nil {
+		return "", err
+	}
+	if len(uids) > 0 {
+		u, err := user.LookupId(strconv.Itoa(int(uids[0])))
+		if err != nil {
+			return "", err
+		}
+		return u.Username, nil
+	}
+	return "", nil
+}

internal/gopsutil/process/process_windows_386.go

@@ -0,0 +1,102 @@
+//go:build windows
+
+package process
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+type PROCESS_MEMORY_COUNTERS struct {
+	CB                         uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uint32
+	WorkingSetSize             uint32
+	QuotaPeakPagedPoolUsage    uint32
+	QuotaPagedPoolUsage        uint32
+	QuotaPeakNonPagedPoolUsage uint32
+	QuotaNonPagedPoolUsage     uint32
+	PagefileUsage              uint32
+	PeakPagefileUsage          uint32
+}
+
+func queryPebAddress(procHandle syscall.Handle, is32BitProcess bool) uint64 {
+	if is32BitProcess {
+		// we are on a 32-bit process reading an external 32-bit process
+		var info processBasicInformation32
+
+		ret, _, _ := common.ProcNtQueryInformationProcess.Call(
+			uintptr(procHandle),
+			uintptr(common.ProcessBasicInformation),
+			uintptr(unsafe.Pointer(&info)),
+			uintptr(unsafe.Sizeof(info)),
+			uintptr(0),
+		)
+		if int(ret) >= 0 {
+			return uint64(info.PebBaseAddress)
+		}
+	} else {
+		// we are on a 32-bit process reading an external 64-bit process
+		if common.ProcNtWow64QueryInformationProcess64.Find() == nil { // avoid panic
+			var info processBasicInformation64
+
+			ret, _, _ := common.ProcNtWow64QueryInformationProcess64.Call(
+				uintptr(procHandle),
+				uintptr(common.ProcessBasicInformation),
+				uintptr(unsafe.Pointer(&info)),
+				uintptr(unsafe.Sizeof(info)),
+				uintptr(0),
+			)
+			if int(ret) >= 0 {
+				return info.PebBaseAddress
+			}
+		}
+	}
+
+	// return 0 on error
+	return 0
+}
+
+func readProcessMemory(h syscall.Handle, is32BitProcess bool, address uint64, size uint) []byte {
+	if is32BitProcess {
+		var read uint
+
+		buffer := make([]byte, size)
+
+		ret, _, _ := common.ProcNtReadVirtualMemory.Call(
+			uintptr(h),
+			uintptr(address),
+			uintptr(unsafe.Pointer(&buffer[0])),
+			uintptr(size),
+			uintptr(unsafe.Pointer(&read)),
+		)
+		if int(ret) >= 0 && read > 0 {
+			return buffer[:read]
+		}
+	} else {
+		// reading a 64-bit process from a 32-bit one
+		if common.ProcNtWow64ReadVirtualMemory64.Find() == nil { // avoid panic
+			var read uint64
+
+			buffer := make([]byte, size)
+
+			ret, _, _ := common.ProcNtWow64ReadVirtualMemory64.Call(
+				uintptr(h),
+				uintptr(address&0xFFFFFFFF), // the call expects a 64-bit value
+				uintptr(address>>32),
+				uintptr(unsafe.Pointer(&buffer[0])),
+				uintptr(size), // the call expects a 64-bit value
+				uintptr(0),    // but size is 32-bit so pass zero as the high dword
+				uintptr(unsafe.Pointer(&read)),
+			)
+			if int(ret) >= 0 && read > 0 {
+				return buffer[:uint(read)]
+			}
+		}
+	}
+
+	// if we reach here, an error happened
+	return nil
+}

internal/gopsutil/process/process_windows_amd64.go

@@ -0,0 +1,76 @@
+//go:build windows
+
+package process
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+type PROCESS_MEMORY_COUNTERS struct {
+	CB                         uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uint64
+	WorkingSetSize             uint64
+	QuotaPeakPagedPoolUsage    uint64
+	QuotaPagedPoolUsage        uint64
+	QuotaPeakNonPagedPoolUsage uint64
+	QuotaNonPagedPoolUsage     uint64
+	PagefileUsage              uint64
+	PeakPagefileUsage          uint64
+}
+
+func queryPebAddress(procHandle syscall.Handle, is32BitProcess bool) uint64 {
+	if is32BitProcess {
+		// we are on a 64-bit process reading an external 32-bit process
+		var wow64 uint
+
+		ret, _, _ := common.ProcNtQueryInformationProcess.Call(
+			uintptr(procHandle),
+			uintptr(common.ProcessWow64Information),
+			uintptr(unsafe.Pointer(&wow64)),
+			uintptr(unsafe.Sizeof(wow64)),
+			uintptr(0),
+		)
+		if int(ret) >= 0 {
+			return uint64(wow64)
+		}
+	} else {
+		// we are on a 64-bit process reading an external 64-bit process
+		var info processBasicInformation64
+
+		ret, _, _ := common.ProcNtQueryInformationProcess.Call(
+			uintptr(procHandle),
+			uintptr(common.ProcessBasicInformation),
+			uintptr(unsafe.Pointer(&info)),
+			uintptr(unsafe.Sizeof(info)),
+			uintptr(0),
+		)
+		if int(ret) >= 0 {
+			return info.PebBaseAddress
+		}
+	}
+
+	// return 0 on error
+	return 0
+}
+
+func readProcessMemory(procHandle syscall.Handle, _ bool, address uint64, size uint) []byte {
+	var read uint
+
+	buffer := make([]byte, size)
+
+	ret, _, _ := common.ProcNtReadVirtualMemory.Call(
+		uintptr(procHandle),
+		uintptr(address),
+		uintptr(unsafe.Pointer(&buffer[0])),
+		uintptr(size),
+		uintptr(unsafe.Pointer(&read)),
+	)
+	if int(ret) >= 0 && read > 0 {
+		return buffer[:read]
+	}
+	return nil
+}

internal/gopsutil/process/types_darwin.go

@@ -0,0 +1,163 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Hand Writing
+// - all pointer in ExternProc to uint64
+
+//go:build ignore
+
+/*
+Input to cgo -godefs.
+*/
+
+// +godefs map struct_in_addr [4]byte /* in_addr */
+// +godefs map struct_in6_addr [16]byte /* in6_addr */
+// +godefs map struct_ [16]byte /* in6_addr */
+
+package process
+
+/*
+#define __DARWIN_UNIX03 0
+#define KERNEL
+#define _DARWIN_USE_64_BIT_INODE
+#include <stdint.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <termios.h>
+#include <unistd.h>
+#include <mach/mach.h>
+#include <mach/message.h>
+#include <sys/event.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <sys/param.h>
+#include <sys/ptrace.h>
+#include <sys/resource.h>
+#include <sys/select.h>
+#include <sys/signal.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <net/bpf.h>
+#include <net/if_dl.h>
+#include <net/if_var.h>
+#include <net/route.h>
+#include <netinet/in.h>
+
+#include <sys/sysctl.h>
+#include <sys/ucred.h>
+#include <sys/proc.h>
+#include <sys/time.h>
+#include <sys/_types/_timeval.h>
+#include <sys/appleapiopts.h>
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <bsm/audit.h>
+#include <sys/queue.h>
+
+enum {
+	sizeofPtr = sizeof(void*),
+};
+
+union sockaddr_all {
+	struct sockaddr s1;	// this one gets used for fields
+	struct sockaddr_in s2;	// these pad it out
+	struct sockaddr_in6 s3;
+	struct sockaddr_un s4;
+	struct sockaddr_dl s5;
+};
+
+struct sockaddr_any {
+	struct sockaddr addr;
+	char pad[sizeof(union sockaddr_all) - sizeof(struct sockaddr)];
+};
+
+struct ucred_queue {
+        struct ucred *tqe_next;
+        struct ucred **tqe_prev;
+        TRACEBUF
+};
+
+*/
+import "C"
+
+// Machine characteristics; for internal use.
+
+const (
+	sizeofPtr      = C.sizeofPtr
+	sizeofShort    = C.sizeof_short
+	sizeofInt      = C.sizeof_int
+	sizeofLong     = C.sizeof_long
+	sizeofLongLong = C.sizeof_longlong
+)
+
+// Basic types
+
+type (
+	_C_short     C.short
+	_C_int       C.int
+	_C_long      C.long
+	_C_long_long C.longlong
+)
+
+// Time
+
+type Timespec C.struct_timespec
+
+type Timeval C.struct_timeval
+
+// Processes
+
+type Rusage C.struct_rusage
+
+type Rlimit C.struct_rlimit
+
+type UGid_t C.gid_t
+
+type KinfoProc C.struct_kinfo_proc
+
+type Eproc C.struct_eproc
+
+type Proc C.struct_proc
+
+type Session C.struct_session
+
+type ucred C.struct_ucred
+
+type Uucred C.struct__ucred
+
+type Upcred C.struct__pcred
+
+type Vmspace C.struct_vmspace
+
+type Sigacts C.struct_sigacts
+
+type ExternProc C.struct_extern_proc
+
+type Itimerval C.struct_itimerval
+
+type Vnode C.struct_vnode
+
+type Pgrp C.struct_pgrp
+
+type UserStruct C.struct_user
+
+type Au_session C.struct_au_session
+
+type Posix_cred C.struct_posix_cred
+
+type Label C.struct_label
+
+type (
+	AuditinfoAddr C.struct_auditinfo_addr
+	AuMask        C.struct_au_mask
+	AuTidAddr     C.struct_au_tid_addr
+)
+
+// TAILQ(ucred)
+type UcredQueue C.struct_ucred_queue

internal/gopsutil/process/types_freebsd.go

@@ -0,0 +1,95 @@
+//go:build ignore
+
+// We still need editing by hands.
+// go tool cgo -godefs types_freebsd.go | sed 's/\*int64/int64/' | sed 's/\*byte/int64/'  > process_freebsd_amd64.go
+
+/*
+Input to cgo -godefs.
+*/
+
+// +godefs map struct_pargs int64 /* pargs */
+// +godefs map struct_proc int64 /* proc */
+// +godefs map struct_user int64 /* user */
+// +godefs map struct_vnode int64 /* vnode */
+// +godefs map struct_vnode int64 /* vnode */
+// +godefs map struct_filedesc int64 /* filedesc */
+// +godefs map struct_vmspace int64 /* vmspace */
+// +godefs map struct_pcb int64 /* pcb */
+// +godefs map struct_thread int64 /* thread */
+// +godefs map struct___sigset [16]byte /* sigset */
+
+package process
+
+/*
+#include <sys/types.h>
+#include <sys/user.h>
+
+enum {
+	sizeofPtr = sizeof(void*),
+};
+
+
+*/
+import "C"
+
+// Machine characteristics; for internal use.
+
+const (
+	CTLKern          = 1  // "high kernel": proc, limits
+	KernProc         = 14 // struct: process entries
+	KernProcPID      = 1  // by process id
+	KernProcProc     = 8  // only return procs
+	KernProcPathname = 12 // path to executable
+	KernProcArgs     = 7  // get/set arguments/proctitle
+)
+
+const (
+	sizeofPtr      = C.sizeofPtr
+	sizeofShort    = C.sizeof_short
+	sizeofInt      = C.sizeof_int
+	sizeofLong     = C.sizeof_long
+	sizeofLongLong = C.sizeof_longlong
+)
+
+const (
+	sizeOfKinfoVmentry = C.sizeof_struct_kinfo_vmentry
+	sizeOfKinfoProc    = C.sizeof_struct_kinfo_proc
+)
+
+// from sys/proc.h
+const (
+	SIDL   = 1 /* Process being created by fork. */
+	SRUN   = 2 /* Currently runnable. */
+	SSLEEP = 3 /* Sleeping on an address. */
+	SSTOP  = 4 /* Process debugging or suspension. */
+	SZOMB  = 5 /* Awaiting collection by parent. */
+	SWAIT  = 6 /* Waiting for interrupt. */
+	SLOCK  = 7 /* Blocked on a lock. */
+)
+
+// Basic types
+
+type (
+	_C_short     C.short
+	_C_int       C.int
+	_C_long      C.long
+	_C_long_long C.longlong
+)
+
+// Time
+
+type Timespec C.struct_timespec
+
+type Timeval C.struct_timeval
+
+// Processes
+
+type Rusage C.struct_rusage
+
+type Rlimit C.struct_rlimit
+
+type KinfoProc C.struct_kinfo_proc
+
+type Priority C.struct_priority
+
+type KinfoVmentry C.struct_kinfo_vmentry

internal/gopsutil/process/types_openbsd.go

@@ -0,0 +1,103 @@
+//go:build ignore
+
+// We still need editing by hands.
+// go tool cgo -godefs types_openbsd.go | sed 's/\*int64/int64/' | sed 's/\*byte/int64/'  > process_openbsd_amd64.go
+
+/*
+Input to cgo -godefs.
+*/
+
+// +godefs map struct_pargs int64 /* pargs */
+// +godefs map struct_proc int64 /* proc */
+// +godefs map struct_user int64 /* user */
+// +godefs map struct_vnode int64 /* vnode */
+// +godefs map struct_vnode int64 /* vnode */
+// +godefs map struct_filedesc int64 /* filedesc */
+// +godefs map struct_vmspace int64 /* vmspace */
+// +godefs map struct_pcb int64 /* pcb */
+// +godefs map struct_thread int64 /* thread */
+// +godefs map struct___sigset [16]byte /* sigset */
+
+package process
+
+/*
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+
+enum {
+	sizeofPtr = sizeof(void*),
+};
+
+
+*/
+import "C"
+
+// Machine characteristics; for internal use.
+
+const (
+	CTLKern          = 1  // "high kernel": proc, limits
+	KernProc         = 66 // struct: process entries
+	KernProcAll      = 0
+	KernProcPID      = 1  // by process id
+	KernProcProc     = 8  // only return procs
+	KernProcPathname = 12 // path to executable
+	KernProcArgs     = 55 // get/set arguments/proctitle
+	KernProcArgv     = 1
+	KernProcEnv      = 3
+)
+
+const (
+	ArgMax = 256 * 1024 // sys/syslimits.h:#define  ARG_MAX
+)
+
+const (
+	sizeofPtr      = C.sizeofPtr
+	sizeofShort    = C.sizeof_short
+	sizeofInt      = C.sizeof_int
+	sizeofLong     = C.sizeof_long
+	sizeofLongLong = C.sizeof_longlong
+)
+
+const (
+	sizeOfKinfoVmentry = C.sizeof_struct_kinfo_vmentry
+	sizeOfKinfoProc    = C.sizeof_struct_kinfo_proc
+)
+
+// from sys/proc.h
+const (
+	SIDL    = 1 /* Process being created by fork. */
+	SRUN    = 2 /* Currently runnable. */
+	SSLEEP  = 3 /* Sleeping on an address. */
+	SSTOP   = 4 /* Process debugging or suspension. */
+	SZOMB   = 5 /* Awaiting collection by parent. */
+	SDEAD   = 6 /* Thread is almost gone */
+	SONPROC = 7 /* Thread is currently on a CPU. */
+)
+
+// Basic types
+
+type (
+	_C_short     C.short
+	_C_int       C.int
+	_C_long      C.long
+	_C_long_long C.longlong
+)
+
+// Time
+
+type Timespec C.struct_timespec
+
+type Timeval C.struct_timeval
+
+// Processes
+
+type Rusage C.struct_rusage
+
+type Rlimit C.struct_rlimit
+
+type KinfoProc C.struct_kinfo_proc
+
+type Priority C.struct_priority
+
+type KinfoVmentry C.struct_kinfo_vmentry