Adding upstream version 2.52.6.

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

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
+}