From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libgo/go/exec/exec.go | 183 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 183 insertions(+) create mode 100644 libgo/go/exec/exec.go (limited to 'libgo/go/exec/exec.go') diff --git a/libgo/go/exec/exec.go b/libgo/go/exec/exec.go new file mode 100644 index 000000000..ba9bd2472 --- /dev/null +++ b/libgo/go/exec/exec.go @@ -0,0 +1,183 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// The exec package runs external commands. +package exec + +import ( + "os" +) + +// Arguments to Run. +const ( + DevNull = iota + PassThrough + Pipe + MergeWithStdout +) + +// A Cmd represents a running command. +// Stdin, Stdout, and Stderr are Files representing pipes +// connected to the running command's standard input, output, and error, +// or else nil, depending on the arguments to Run. +// Pid is the running command's operating system process ID. +type Cmd struct { + Stdin *os.File + Stdout *os.File + Stderr *os.File + Pid int +} + +// Given mode (DevNull, etc), return file for child +// and file to record in Cmd structure. +func modeToFiles(mode, fd int) (*os.File, *os.File, os.Error) { + switch mode { + case DevNull: + rw := os.O_WRONLY + if fd == 0 { + rw = os.O_RDONLY + } + f, err := os.Open(os.DevNull, rw, 0) + return f, nil, err + case PassThrough: + switch fd { + case 0: + return os.Stdin, nil, nil + case 1: + return os.Stdout, nil, nil + case 2: + return os.Stderr, nil, nil + } + case Pipe: + r, w, err := os.Pipe() + if err != nil { + return nil, nil, err + } + if fd == 0 { + return r, w, nil + } + return w, r, nil + } + return nil, nil, os.EINVAL +} + +// Run starts the named binary running with +// arguments argv and environment envv. +// It returns a pointer to a new Cmd representing +// the command or an error. +// +// The parameters stdin, stdout, and stderr +// specify how to handle standard input, output, and error. +// The choices are DevNull (connect to /dev/null), +// PassThrough (connect to the current process's standard stream), +// Pipe (connect to an operating system pipe), and +// MergeWithStdout (only for standard error; use the same +// file descriptor as was used for standard output). +// If a parameter is Pipe, then the corresponding field (Stdin, Stdout, Stderr) +// of the returned Cmd is the other end of the pipe. +// Otherwise the field in Cmd is nil. +func Run(name string, argv, envv []string, dir string, stdin, stdout, stderr int) (p *Cmd, err os.Error) { + p = new(Cmd) + var fd [3]*os.File + + if fd[0], p.Stdin, err = modeToFiles(stdin, 0); err != nil { + goto Error + } + if fd[1], p.Stdout, err = modeToFiles(stdout, 1); err != nil { + goto Error + } + if stderr == MergeWithStdout { + fd[2] = fd[1] + } else if fd[2], p.Stderr, err = modeToFiles(stderr, 2); err != nil { + goto Error + } + + // Run command. + p.Pid, err = os.ForkExec(name, argv, envv, dir, fd[0:]) + if err != nil { + goto Error + } + if fd[0] != os.Stdin { + fd[0].Close() + } + if fd[1] != os.Stdout { + fd[1].Close() + } + if fd[2] != os.Stderr && fd[2] != fd[1] { + fd[2].Close() + } + return p, nil + +Error: + if fd[0] != os.Stdin && fd[0] != nil { + fd[0].Close() + } + if fd[1] != os.Stdout && fd[1] != nil { + fd[1].Close() + } + if fd[2] != os.Stderr && fd[2] != nil && fd[2] != fd[1] { + fd[2].Close() + } + if p.Stdin != nil { + p.Stdin.Close() + } + if p.Stdout != nil { + p.Stdout.Close() + } + if p.Stderr != nil { + p.Stderr.Close() + } + return nil, err +} + +// Wait waits for the running command p, +// returning the Waitmsg returned by os.Wait and an error. +// The options are passed through to os.Wait. +// Setting options to 0 waits for p to exit; +// other options cause Wait to return for other +// process events; see package os for details. +func (p *Cmd) Wait(options int) (*os.Waitmsg, os.Error) { + if p.Pid <= 0 { + return nil, os.ErrorString("exec: invalid use of Cmd.Wait") + } + w, err := os.Wait(p.Pid, options) + if w != nil && (w.Exited() || w.Signaled()) { + p.Pid = -1 + } + return w, err +} + +// Close waits for the running command p to exit, +// if it hasn't already, and then closes the non-nil file descriptors +// p.Stdin, p.Stdout, and p.Stderr. +func (p *Cmd) Close() os.Error { + if p.Pid > 0 { + // Loop on interrupt, but + // ignore other errors -- maybe + // caller has already waited for pid. + _, err := p.Wait(0) + for err == os.EINTR { + _, err = p.Wait(0) + } + } + + // Close the FDs that are still open. + var err os.Error + if p.Stdin != nil && p.Stdin.Fd() >= 0 { + if err1 := p.Stdin.Close(); err1 != nil { + err = err1 + } + } + if p.Stdout != nil && p.Stdout.Fd() >= 0 { + if err1 := p.Stdout.Close(); err1 != nil && err != nil { + err = err1 + } + } + if p.Stderr != nil && p.Stderr != p.Stdout && p.Stderr.Fd() >= 0 { + if err1 := p.Stderr.Close(); err1 != nil && err != nil { + err = err1 + } + } + return err +} -- cgit v1.2.3