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// 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.
// +build darwin dragonfly freebsd linux netbsd openbsd windows
package os
import (
"syscall"
)
// The only signal values guaranteed to be present on all systems
// are Interrupt (send the process an interrupt) and Kill (force
// the process to exit).
var (
Interrupt Signal = syscall.SIGINT
Kill Signal = syscall.SIGKILL
)
func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
// If there is no SysProcAttr (ie. no Chroot or changed
// UID/GID), double-check existence of the directory we want
// to chdir into. We can make the error clearer this way.
if attr != nil && attr.Sys == nil && attr.Dir != "" {
if _, err := Stat(attr.Dir); err != nil {
pe := err.(*PathError)
pe.Op = "chdir"
return nil, pe
}
}
sysattr := &syscall.ProcAttr{
Dir: attr.Dir,
Env: attr.Env,
Sys: attr.Sys,
}
if sysattr.Env == nil {
sysattr.Env = Environ()
}
for _, f := range attr.Files {
sysattr.Files = append(sysattr.Files, f.Fd())
}
pid, h, e := syscall.StartProcess(name, argv, sysattr)
if e != nil {
return nil, &PathError{"fork/exec", name, e}
}
return newProcess(pid, h), nil
}
func (p *Process) kill() error {
return p.Signal(Kill)
}
// ProcessState stores information about a process, as reported by Wait.
type ProcessState struct {
pid int // The process's id.
status syscall.WaitStatus // System-dependent status info.
rusage *syscall.Rusage
}
// Pid returns the process id of the exited process.
func (p *ProcessState) Pid() int {
return p.pid
}
func (p *ProcessState) exited() bool {
return p.status.Exited()
}
func (p *ProcessState) success() bool {
return p.status.ExitStatus() == 0
}
func (p *ProcessState) sys() interface{} {
return p.status
}
func (p *ProcessState) sysUsage() interface{} {
return p.rusage
}
// Convert i to decimal string.
func itod(i int) string {
if i == 0 {
return "0"
}
u := uint64(i)
if i < 0 {
u = -u
}
// Assemble decimal in reverse order.
var b [32]byte
bp := len(b)
for ; u > 0; u /= 10 {
bp--
b[bp] = byte(u%10) + '0'
}
if i < 0 {
bp--
b[bp] = '-'
}
return string(b[bp:])
}
func (p *ProcessState) String() string {
if p == nil {
return "<nil>"
}
status := p.Sys().(syscall.WaitStatus)
res := ""
switch {
case status.Exited():
res = "exit status " + itod(status.ExitStatus())
case status.Signaled():
res = "signal: " + status.Signal().String()
case status.Stopped():
res = "stop signal: " + status.StopSignal().String()
if status.StopSignal() == syscall.SIGTRAP && status.TrapCause() != 0 {
res += " (trap " + itod(status.TrapCause()) + ")"
}
case status.Continued():
res = "continued"
}
if status.CoreDump() {
res += " (core dumped)"
}
return res
}
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