152 lines
3.4 KiB
Go
152 lines
3.4 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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)
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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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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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// Create array of integer (system) fds.
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intfd := make([]int, len(attr.Files))
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for i, f := range attr.Files {
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if f == nil {
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intfd[i] = -1
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} else {
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intfd[i] = f.Fd()
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}
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}
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sysattr.Files = intfd
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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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// Exec replaces the current process with an execution of the
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// named binary, with arguments argv and environment envv.
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// If successful, Exec never returns. If it fails, it returns an error.
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// ForkExec is almost always a better way to execute a program.
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func Exec(name string, argv []string, envv []string) error {
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e := syscall.Exec(name, argv, envv)
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if e != nil {
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return &PathError{"exec", name, e}
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}
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return nil
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}
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// Waitmsg stores the information about an exited process as reported by Wait.
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type Waitmsg struct {
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syscall.Waitmsg
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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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// Waitmsg describing its status and an error, if any. The options
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// (WNOHANG etc.) affect the behavior of the Wait call.
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func (p *Process) Wait(options int) (w *Waitmsg, err error) {
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var waitmsg syscall.Waitmsg
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if p.Pid == -1 {
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return nil, EINVAL
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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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return &Waitmsg{waitmsg}, nil
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}
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// Wait waits for process pid to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any. The options
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// (WNOHANG etc.) affect the behavior of the Wait call.
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// Wait is equivalent to calling FindProcess and then Wait
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// and Release on the result.
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func Wait(pid int, options int) (w *Waitmsg, err error) {
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p, e := FindProcess(pid)
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if e != nil {
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return nil, e
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}
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defer p.Release()
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return p.Wait(options)
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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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func (w *Waitmsg) String() string {
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if w == nil {
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return "<nil>"
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}
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return "exit status: " + w.Msg
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}
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