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// SPDX-License-Identifier: BSD-3-Clause
//go:build linux || freebsd || openbsd || darwin || solaris
package process
import (
"context"
"errors"
"fmt"
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"syscall"
"golang.org/x/sys/unix"
"github.com/shirou/gopsutil/v4/internal/common"
)
type Signal = syscall.Signal
// 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
}
// isMount is a port of python's os.path.ismount()
// https://github.com/python/cpython/blob/08ff4369afca84587b1c82034af4e9f64caddbf2/Lib/posixpath.py#L186-L216
// https://docs.python.org/3/library/os.path.html#os.path.ismount
func isMount(path string) bool {
// Check symlinkness with os.Lstat; unix.DT_LNK is not portable
fileInfo, err := os.Lstat(path)
if err != nil {
return false
}
if fileInfo.Mode()&os.ModeSymlink != 0 {
return false
}
var stat1 unix.Stat_t
if err := unix.Lstat(path, &stat1); err != nil {
return false
}
parent := filepath.Join(path, "..")
var stat2 unix.Stat_t
if err := unix.Lstat(parent, &stat2); err != nil {
return false
}
return stat1.Dev != stat2.Dev || stat1.Ino == stat2.Ino
}
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
}
defer proc.Release()
if isMount(common.HostProcWithContext(ctx)) { // if /<HOST_PROC>/proc exists and is mounted, check if /<HOST_PROC>/proc/<PID> folder exists
_, err := os.Stat(common.HostProcWithContext(ctx, strconv.Itoa(int(pid))))
if os.IsNotExist(err) {
return false, nil
}
return err == nil, err
}
// procfs does not exist or is not mounted, check PID existence by signalling the pid
err = proc.Signal(syscall.Signal(0))
if err == nil {
return true, nil
}
if errors.Is(err, os.ErrProcessDone) {
return false, nil
}
var errno syscall.Errno
if !errors.As(err, &errno) {
return false, err
}
switch errno {
case syscall.ESRCH:
return false, nil
case syscall.EPERM:
return true, nil
}
return false, err
}
func (p *Process) SendSignalWithContext(ctx context.Context, sig syscall.Signal) error {
process, err := os.FindProcess(int(p.Pid))
if err != nil {
return err
}
defer process.Release()
err = process.Signal(sig)
if err != nil {
return err
}
return nil
}
func (p *Process) SuspendWithContext(ctx context.Context) error {
return p.SendSignalWithContext(ctx, unix.SIGSTOP)
}
func (p *Process) ResumeWithContext(ctx context.Context) error {
return p.SendSignalWithContext(ctx, unix.SIGCONT)
}
func (p *Process) TerminateWithContext(ctx context.Context) error {
return p.SendSignalWithContext(ctx, unix.SIGTERM)
}
func (p *Process) KillWithContext(ctx context.Context) error {
return p.SendSignalWithContext(ctx, unix.SIGKILL)
}
func (p *Process) UsernameWithContext(ctx context.Context) (string, error) {
uids, err := p.UidsWithContext(ctx)
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
}
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