open-consul/vendor/github.com/shirou/gopsutil/process/process_posix.go

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// +build linux freebsd openbsd darwin
package process
import (
"context"
"fmt"
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"syscall"
"github.com/shirou/gopsutil/internal/common"
"golang.org/x/sys/unix"
)
// 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 os.IsNotExist(err) {
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
}