Adding upstream version 2.52.6.

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

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
+}