1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
14 // The only signal values guaranteed to be present in the os package
15 // on all systems are Interrupt (send the process an interrupt) and
16 // Kill (force the process to exit). Interrupt is not implemented on
17 // Windows; using it with os.Process.Signal will return an error.
19 Interrupt Signal = syscall.Note("interrupt")
20 Kill Signal = syscall.Note("kill")
23 func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
24 sysattr := &syscall.ProcAttr{
30 sysattr.Files = make([]uintptr, 0, len(attr.Files))
31 for _, f := range attr.Files {
32 sysattr.Files = append(sysattr.Files, f.Fd())
35 pid, h, e := syscall.StartProcess(name, argv, sysattr)
37 return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
40 return newProcess(pid, h), nil
43 func (p *Process) writeProcFile(file string, data string) error {
44 f, e := OpenFile("/proc/"+itoa.Itoa(p.Pid)+"/"+file, O_WRONLY, 0)
49 _, e = f.Write([]byte(data))
53 func (p *Process) signal(sig Signal) error {
57 if e := p.writeProcFile("note", sig.String()); e != nil {
58 return NewSyscallError("signal", e)
63 func (p *Process) kill() error {
67 func (p *Process) wait() (ps *ProcessState, err error) {
68 var waitmsg syscall.Waitmsg
71 return nil, ErrInvalid
73 err = syscall.WaitProcess(p.Pid, &waitmsg)
75 return nil, NewSyscallError("wait", err)
86 func (p *Process) release() error {
89 // no need for a finalizer anymore
90 runtime.SetFinalizer(p, nil)
94 func findProcess(pid int) (p *Process, err error) {
96 return newProcess(pid, 0), nil
99 // ProcessState stores information about a process, as reported by Wait.
100 type ProcessState struct {
101 pid int // The process's id.
102 status *syscall.Waitmsg // System-dependent status info.
105 // Pid returns the process id of the exited process.
106 func (p *ProcessState) Pid() int {
110 func (p *ProcessState) exited() bool {
111 return p.status.Exited()
114 func (p *ProcessState) success() bool {
115 return p.status.ExitStatus() == 0
118 func (p *ProcessState) sys() any {
122 func (p *ProcessState) sysUsage() any {
126 func (p *ProcessState) userTime() time.Duration {
127 return time.Duration(p.status.Time[0]) * time.Millisecond
130 func (p *ProcessState) systemTime() time.Duration {
131 return time.Duration(p.status.Time[1]) * time.Millisecond
134 func (p *ProcessState) String() string {
138 return "exit status: " + p.status.Msg
141 // ExitCode returns the exit code of the exited process, or -1
142 // if the process hasn't exited or was terminated by a signal.
143 func (p *ProcessState) ExitCode() int {
144 // return -1 if the process hasn't started.
148 return p.status.ExitStatus()