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directory-per-package step 1: move files from lib/X.go to lib/X/X.go
no substantive changes except: - new Makefiles, all auto-generated - go/src/lib/Makefile has been extensively edited R=rsc OCL=28310 CL=28310
This commit is contained in:
Rob Pike
parent
f821e3c7c3
commit
9b2c5da922
41 changed files with 1035 additions and 80 deletions
228
src/lib/exec/exec.go
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228
src/lib/exec/exec.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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"strings";
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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("/dev/null", 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 binary prog 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(argv0 string, argv, envv []string, stdin, stdout, stderr int) (p *Cmd, err os.Error)
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{
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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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p.Stderr = p.Stdout;
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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(argv0, argv, envv, &fd);
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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 uint64) (*os.Waitmsg, os.Error) {
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if p.Pid < 0 {
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return nil, os.EINVAL;
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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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w, err := p.Wait(0);
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for err == os.EINTR {
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w, 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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func canExec(file string) bool{
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d, err := os.Stat(file);
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if err != nil {
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return false;
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}
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return d.IsRegular() && d.Permission() & 0111 != 0;
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}
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// LookPath searches for an executable binary named file
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// in the directories named by the PATH environment variable.
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// If file contains a slash, it is tried directly and the PATH is not consulted.
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//
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// TODO(rsc): Does LookPath belong in os instead?
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func LookPath(file string) (string, os.Error) {
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// NOTE(rsc): I wish we could use the Plan 9 behavior here
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// (only bypass the path if file begins with / or ./ or ../)
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// but that would not match all the Unix shells.
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if strings.Index(file, "/") >= 0 {
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if canExec(file) {
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return file, nil;
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}
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return "", os.ENOENT;
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}
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pathenv, err := os.Getenv("PATH");
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if err != nil {
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// Unix shell semantics: no $PATH means assume PATH=""
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// (equivalent to PATH=".").
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pathenv = "";
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}
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for i, dir := range strings.Split(pathenv, ":") {
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if dir == "" {
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// Unix shell semantics: path element "" means "."
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dir = ".";
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}
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if canExec(dir+"/"+file) {
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return dir+"/"+file, nil;
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}
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}
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return "", os.ENOENT;
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}
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