150 lines
3.6 KiB
Go
150 lines
3.6 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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// +build darwin freebsd linux netbsd openbsd windows
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package os
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import (
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"runtime"
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"syscall"
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)
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type UnixSignal int32
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func (sig UnixSignal) String() string {
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s := runtime.Signame(int32(sig))
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if len(s) > 0 {
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return s
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}
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return "UnixSignal"
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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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//
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// StartProcess is a low-level interface. The os/exec package provides
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// higher-level interfaces.
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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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if sysattr.Env == nil {
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sysattr.Env = Environ()
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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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// Kill causes the Process to exit immediately.
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func (p *Process) Kill() error {
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return p.Signal(UnixSignal(syscall.SIGKILL))
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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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//
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// To run a child process, see StartProcess (for a low-level interface)
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// or the os/exec package (for higher-level interfaces).
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func Exec(name string, argv []string, envv []string) error {
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if envv == nil {
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envv = Environ()
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}
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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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// TODO(rsc): Should os implement its own syscall.WaitStatus
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// wrapper with the methods, or is exposing the underlying one enough?
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//
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// TODO(rsc): Certainly need to have Rusage struct,
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// since syscall one might have different field types across
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// different OS.
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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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Pid int // The process's id.
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syscall.WaitStatus // System-dependent status info.
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Rusage *syscall.Rusage // System-dependent resource usage info.
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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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// Convert i to decimal string.
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func itod(i int) string {
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if i == 0 {
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return "0"
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}
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u := uint64(i)
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if i < 0 {
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u = -u
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}
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// Assemble decimal in reverse order.
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var b [32]byte
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bp := len(b)
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for ; u > 0; u /= 10 {
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bp--
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b[bp] = byte(u%10) + '0'
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}
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if i < 0 {
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bp--
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b[bp] = '-'
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}
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return string(b[bp:])
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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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// TODO(austin) Use signal names when possible?
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res := ""
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switch {
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case w.Exited():
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res = "exit status " + itod(w.ExitStatus())
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case w.Signaled():
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res = "signal " + itod(w.Signal())
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case w.Stopped():
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res = "stop signal " + itod(w.StopSignal())
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if w.StopSignal() == syscall.SIGTRAP && w.TrapCause() != 0 {
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res += " (trap " + itod(w.TrapCause()) + ")"
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}
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case w.Continued():
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res = "continued"
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}
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if w.CoreDump() {
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res += " (core dumped)"
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}
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return res
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}
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