162 lines
3.4 KiB
Go
162 lines
3.4 KiB
Go
// +build linux freebsd openbsd darwin
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package process
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import (
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"context"
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"fmt"
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"os"
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"os/user"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"github.com/shirou/gopsutil/v3/internal/common"
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"golang.org/x/sys/unix"
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)
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// POSIX
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func getTerminalMap() (map[uint64]string, error) {
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ret := make(map[uint64]string)
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var termfiles []string
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d, err := os.Open("/dev")
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if err != nil {
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return nil, err
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}
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defer d.Close()
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devnames, err := d.Readdirnames(-1)
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if err != nil {
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return nil, err
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}
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for _, devname := range devnames {
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if strings.HasPrefix(devname, "/dev/tty") {
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termfiles = append(termfiles, "/dev/tty/"+devname)
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}
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}
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var ptsnames []string
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ptsd, err := os.Open("/dev/pts")
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if err != nil {
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ptsnames, _ = filepath.Glob("/dev/ttyp*")
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if ptsnames == nil {
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return nil, err
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}
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}
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defer ptsd.Close()
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if ptsnames == nil {
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defer ptsd.Close()
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ptsnames, err = ptsd.Readdirnames(-1)
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if err != nil {
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return nil, err
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}
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for _, ptsname := range ptsnames {
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termfiles = append(termfiles, "/dev/pts/"+ptsname)
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}
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} else {
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termfiles = ptsnames
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}
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for _, name := range termfiles {
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stat := unix.Stat_t{}
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if err = unix.Stat(name, &stat); err != nil {
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return nil, err
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}
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rdev := uint64(stat.Rdev)
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ret[rdev] = strings.Replace(name, "/dev", "", -1)
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}
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return ret, nil
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}
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func PidExistsWithContext(ctx context.Context, pid int32) (bool, error) {
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if pid <= 0 {
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return false, fmt.Errorf("invalid pid %v", pid)
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}
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proc, err := os.FindProcess(int(pid))
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if err != nil {
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return false, err
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}
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if _, err := os.Stat(common.HostProc()); err == nil { //Means that proc filesystem exist
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// Checking PID existence based on existence of /<HOST_PROC>/proc/<PID> folder
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// This covers the case when running inside container with a different process namespace (by default)
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_, err := os.Stat(common.HostProc(strconv.Itoa(int(pid))))
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if os.IsNotExist(err) {
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return false, nil
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}
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return err == nil, err
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}
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//'/proc' filesystem is not exist, checking of PID existence is done via signalling the process
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//Make sense only if we run in the same process namespace
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err = proc.Signal(syscall.Signal(0))
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if err == nil {
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return true, nil
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}
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if err.Error() == "os: process already finished" {
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return false, nil
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}
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errno, ok := err.(syscall.Errno)
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if !ok {
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return false, err
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}
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switch errno {
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case syscall.ESRCH:
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return false, nil
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case syscall.EPERM:
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return true, nil
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}
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return false, err
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}
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func (p *Process) SendSignalWithContext(ctx context.Context, sig syscall.Signal) error {
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process, err := os.FindProcess(int(p.Pid))
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if err != nil {
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return err
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}
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err = process.Signal(sig)
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if err != nil {
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return err
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}
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return nil
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}
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func (p *Process) SuspendWithContext(ctx context.Context) error {
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return p.SendSignalWithContext(ctx, unix.SIGSTOP)
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}
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func (p *Process) ResumeWithContext(ctx context.Context) error {
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return p.SendSignalWithContext(ctx, unix.SIGCONT)
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}
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func (p *Process) TerminateWithContext(ctx context.Context) error {
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return p.SendSignalWithContext(ctx, unix.SIGTERM)
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}
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func (p *Process) KillWithContext(ctx context.Context) error {
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return p.SendSignalWithContext(ctx, unix.SIGKILL)
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}
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func (p *Process) UsernameWithContext(ctx context.Context) (string, error) {
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uids, err := p.UidsWithContext(ctx)
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if err != nil {
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return "", err
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}
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if len(uids) > 0 {
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u, err := user.LookupId(strconv.Itoa(int(uids[0])))
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if err != nil {
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return "", err
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}
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return u.Username, nil
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}
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return "", nil
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}
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