Adding upstream version 2.52.6.

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

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
+}