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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.
//go:build unix || (js && wasm) || wasip1 || windows
package os
import (
"internal/itoa"
"internal/syscall/execenv"
"runtime"
"syscall"
)
// unsetHandle is a value for Process.handle used when the handle is not set.
// Same as syscall.InvalidHandle for Windows.
const unsetHandle = ^uintptr(0)
// The only signal values guaranteed to be present in the os package on all
// systems are os.Interrupt (send the process an interrupt) and os.Kill (force
// the process to exit). On Windows, sending os.Interrupt to a process with
// os.Process.Signal is not implemented; it will return an error instead of
// sending a signal.
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: ensurePidfd(attr.Sys),
}
if sysattr.Env == nil {
sysattr.Env, err = execenv.Default(sysattr.Sys)
if err != nil {
return nil, err
}
}
sysattr.Files = make([]uintptr, 0, len(attr.Files))
for _, f := range attr.Files {
sysattr.Files = append(sysattr.Files, f.Fd())
}
pid, h, e := syscall.StartProcess(name, argv, sysattr)
// Make sure we don't run the finalizers of attr.Files.
runtime.KeepAlive(attr)
if e != nil {
return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
}
// For Windows, syscall.StartProcess above already returned a process handle.
if runtime.GOOS != "windows" {
h = getPidfd(sysattr.Sys)
}
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() any {
return p.status
}
func (p *ProcessState) sysUsage() any {
return p.rusage
}
func (p *ProcessState) String() string {
if p == nil {
return "<nil>"
}
status := p.Sys().(syscall.WaitStatus)
res := ""
switch {
case status.Exited():
code := status.ExitStatus()
if runtime.GOOS == "windows" && uint(code) >= 1<<16 { // windows uses large hex numbers
res = "exit status " + itoa.Uitox(uint(code))
} else { // unix systems use small decimal integers
res = "exit status " + itoa.Itoa(code) // unix
}
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 " + itoa.Itoa(status.TrapCause()) + ")"
}
case status.Continued():
res = "continued"
}
if status.CoreDump() {
res += " (core dumped)"
}
return res
}
// ExitCode returns the exit code of the exited process, or -1
// if the process hasn't exited or was terminated by a signal.
func (p *ProcessState) ExitCode() int {
// return -1 if the process hasn't started.
if p == nil {
return -1
}
return p.status.ExitStatus()
}
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