mirror of
https://github.com/golang/go
synced 2024-10-05 04:21:22 -06:00
880cda557a
fix a couple of other minor related details. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5690071
165 lines
4.0 KiB
Go
165 lines
4.0 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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// StartProcess starts a new process with the program, arguments and attributes
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// specified by name, argv and attr.
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// If there is an error, it will be of type *PathError.
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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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// Plan9Note implements the Signal interface on Plan 9.
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type Plan9Note string
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func (note Plan9Note) String() string {
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return string(note)
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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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f, e := OpenFile("/proc/"+itoa(p.Pid)+"/note", O_WRONLY, 0)
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if e != nil {
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return NewSyscallError("signal", e)
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}
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defer f.Close()
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_, e = f.Write([]byte(sig.String()))
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return e
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}
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// Kill causes the Process to exit immediately.
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func (p *Process) Kill() error {
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f, e := OpenFile("/proc/"+itoa(p.Pid)+"/ctl", O_WRONLY, 0)
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if e != nil {
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return NewSyscallError("kill", e)
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}
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defer f.Close()
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_, e = f.Write([]byte("kill"))
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return e
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}
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// Wait waits for the Process to exit or stop, and then returns a
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// ProcessState describing its status and an error, if any.
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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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for true {
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err = syscall.Await(&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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if waitmsg.Pid == p.Pid {
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p.done = true
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break
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}
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}
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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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// Release releases any resources associated with the Process.
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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 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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// Exited returns whether the program has exited.
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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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// Success reports whether the program exited successfully,
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// such as with exit status 0 on Unix.
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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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// Sys returns system-dependent exit information about
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// the process. Convert it to the appropriate underlying
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// type, such as *syscall.Waitmsg on Plan 9, to access its contents.
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func (p *ProcessState) Sys() interface{} {
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return p.status
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}
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// SysUsage returns system-dependent resource usage information about
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// the exited process. Convert it to the appropriate underlying
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// type, such as *syscall.Waitmsg on Plan 9, to access its contents.
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func (p *ProcessState) SysUsage() interface{} {
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return p.status
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}
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// UserTime returns the user CPU time of the exited process and its children.
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// It is always reported as 0 on Windows.
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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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// SystemTime returns the system CPU time of the exited process and its children.
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// It is always reported as 0 on Windows.
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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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