145 lines
3.0 KiB
Go
145 lines
3.0 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"errors"
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"runtime"
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"syscall"
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"time"
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)
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// The only signal values guaranteed to be present on all systems
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// are Interrupt (send the process an interrupt) and Kill (force
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// the process to exit).
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var (
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Interrupt Signal = syscall.Note("interrupt")
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Kill Signal = syscall.Note("kill")
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)
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func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
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sysattr := &syscall.ProcAttr{
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Dir: attr.Dir,
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Env: attr.Env,
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Sys: attr.Sys,
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}
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for _, f := range attr.Files {
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sysattr.Files = append(sysattr.Files, f.Fd())
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}
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pid, h, e := syscall.StartProcess(name, argv, sysattr)
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if e != nil {
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return nil, &PathError{"fork/exec", name, e}
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}
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return newProcess(pid, h), nil
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}
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func (p *Process) writeProcFile(file string, data string) error {
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f, e := OpenFile("/proc/"+itoa(p.Pid)+"/"+file, O_WRONLY, 0)
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if e != nil {
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return e
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}
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defer f.Close()
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_, e = f.Write([]byte(data))
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return e
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}
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func (p *Process) signal(sig Signal) error {
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if p.done() {
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return errors.New("os: process already finished")
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}
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if sig == Kill {
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// Special-case the kill signal since it doesn't use /proc/$pid/note.
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return p.Kill()
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}
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if e := p.writeProcFile("note", sig.String()); e != nil {
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return NewSyscallError("signal", e)
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}
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return nil
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}
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func (p *Process) kill() error {
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if e := p.writeProcFile("ctl", "kill"); e != nil {
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return NewSyscallError("kill", e)
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}
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return nil
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}
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func (p *Process) wait() (ps *ProcessState, err error) {
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var waitmsg syscall.Waitmsg
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if p.Pid == -1 {
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return nil, ErrInvalid
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}
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err = syscall.WaitProcess(p.Pid, &waitmsg)
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if err != nil {
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return nil, NewSyscallError("wait", err)
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}
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p.setDone()
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ps = &ProcessState{
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pid: waitmsg.Pid,
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status: &waitmsg,
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}
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return ps, nil
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}
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func (p *Process) release() error {
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// NOOP for Plan 9.
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p.Pid = -1
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// no need for a finalizer anymore
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runtime.SetFinalizer(p, nil)
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return nil
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}
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func findProcess(pid int) (p *Process, err error) {
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// NOOP for Plan 9.
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return newProcess(pid, 0), nil
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}
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// ProcessState stores information about a process, as reported by Wait.
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type ProcessState struct {
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pid int // The process's id.
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status *syscall.Waitmsg // System-dependent status info.
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}
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// Pid returns the process id of the exited process.
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func (p *ProcessState) Pid() int {
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return p.pid
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}
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func (p *ProcessState) exited() bool {
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return p.status.Exited()
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}
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func (p *ProcessState) success() bool {
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return p.status.ExitStatus() == 0
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}
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func (p *ProcessState) sys() interface{} {
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return p.status
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}
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func (p *ProcessState) sysUsage() interface{} {
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return p.status
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}
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func (p *ProcessState) userTime() time.Duration {
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return time.Duration(p.status.Time[0]) * time.Millisecond
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}
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func (p *ProcessState) systemTime() time.Duration {
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return time.Duration(p.status.Time[1]) * time.Millisecond
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}
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func (p *ProcessState) String() string {
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if p == nil {
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return "<nil>"
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}
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return "exit status: " + p.status.Msg
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}
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