184 lines
4.4 KiB
Go
184 lines
4.4 KiB
Go
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// 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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// The exec package runs external commands.
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package exec
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import (
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"os"
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)
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// Arguments to Run.
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const (
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DevNull = iota
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PassThrough
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Pipe
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MergeWithStdout
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)
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// A Cmd represents a running command.
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// Stdin, Stdout, and Stderr are Files representing pipes
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// connected to the running command's standard input, output, and error,
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// or else nil, depending on the arguments to Run.
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// Pid is the running command's operating system process ID.
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type Cmd struct {
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Stdin *os.File
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Stdout *os.File
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Stderr *os.File
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Pid int
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}
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// Given mode (DevNull, etc), return file for child
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// and file to record in Cmd structure.
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func modeToFiles(mode, fd int) (*os.File, *os.File, os.Error) {
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switch mode {
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case DevNull:
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rw := os.O_WRONLY
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if fd == 0 {
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rw = os.O_RDONLY
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}
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f, err := os.Open(os.DevNull, rw, 0)
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return f, nil, err
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case PassThrough:
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switch fd {
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case 0:
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return os.Stdin, nil, nil
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case 1:
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return os.Stdout, nil, nil
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case 2:
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return os.Stderr, nil, nil
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}
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case Pipe:
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r, w, err := os.Pipe()
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if err != nil {
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return nil, nil, err
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}
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if fd == 0 {
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return r, w, nil
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}
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return w, r, nil
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}
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return nil, nil, os.EINVAL
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}
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// Run starts the named binary running with
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// arguments argv and environment envv.
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// It returns a pointer to a new Cmd representing
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// the command or an error.
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//
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// The parameters stdin, stdout, and stderr
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// specify how to handle standard input, output, and error.
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// The choices are DevNull (connect to /dev/null),
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// PassThrough (connect to the current process's standard stream),
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// Pipe (connect to an operating system pipe), and
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// MergeWithStdout (only for standard error; use the same
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// file descriptor as was used for standard output).
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// If a parameter is Pipe, then the corresponding field (Stdin, Stdout, Stderr)
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// of the returned Cmd is the other end of the pipe.
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// Otherwise the field in Cmd is nil.
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func Run(name string, argv, envv []string, dir string, stdin, stdout, stderr int) (p *Cmd, err os.Error) {
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p = new(Cmd)
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var fd [3]*os.File
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if fd[0], p.Stdin, err = modeToFiles(stdin, 0); err != nil {
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goto Error
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}
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if fd[1], p.Stdout, err = modeToFiles(stdout, 1); err != nil {
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goto Error
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}
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if stderr == MergeWithStdout {
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fd[2] = fd[1]
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} else if fd[2], p.Stderr, err = modeToFiles(stderr, 2); err != nil {
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goto Error
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}
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// Run command.
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p.Pid, err = os.ForkExec(name, argv, envv, dir, fd[0:])
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if err != nil {
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goto Error
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}
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if fd[0] != os.Stdin {
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fd[0].Close()
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}
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if fd[1] != os.Stdout {
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fd[1].Close()
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}
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if fd[2] != os.Stderr && fd[2] != fd[1] {
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fd[2].Close()
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}
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return p, nil
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Error:
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if fd[0] != os.Stdin && fd[0] != nil {
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fd[0].Close()
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}
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if fd[1] != os.Stdout && fd[1] != nil {
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fd[1].Close()
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}
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if fd[2] != os.Stderr && fd[2] != nil && fd[2] != fd[1] {
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fd[2].Close()
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}
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if p.Stdin != nil {
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p.Stdin.Close()
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}
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if p.Stdout != nil {
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p.Stdout.Close()
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}
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if p.Stderr != nil {
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p.Stderr.Close()
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}
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return nil, err
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}
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// Wait waits for the running command p,
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// returning the Waitmsg returned by os.Wait and an error.
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// The options are passed through to os.Wait.
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// Setting options to 0 waits for p to exit;
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// other options cause Wait to return for other
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// process events; see package os for details.
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func (p *Cmd) Wait(options int) (*os.Waitmsg, os.Error) {
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if p.Pid <= 0 {
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return nil, os.ErrorString("exec: invalid use of Cmd.Wait")
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}
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w, err := os.Wait(p.Pid, options)
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if w != nil && (w.Exited() || w.Signaled()) {
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p.Pid = -1
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}
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return w, err
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}
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// Close waits for the running command p to exit,
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// if it hasn't already, and then closes the non-nil file descriptors
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// p.Stdin, p.Stdout, and p.Stderr.
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func (p *Cmd) Close() os.Error {
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if p.Pid > 0 {
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// Loop on interrupt, but
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// ignore other errors -- maybe
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// caller has already waited for pid.
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_, err := p.Wait(0)
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for err == os.EINTR {
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_, err = p.Wait(0)
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}
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}
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// Close the FDs that are still open.
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var err os.Error
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if p.Stdin != nil && p.Stdin.Fd() >= 0 {
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if err1 := p.Stdin.Close(); err1 != nil {
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err = err1
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}
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}
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if p.Stdout != nil && p.Stdout.Fd() >= 0 {
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if err1 := p.Stdout.Close(); err1 != nil && err != nil {
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err = err1
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}
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}
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if p.Stderr != nil && p.Stderr != p.Stdout && p.Stderr.Fd() >= 0 {
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if err1 := p.Stderr.Close(); err1 != nil && err != nil {
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err = err1
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}
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}
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return err
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}
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