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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.
package os
import (
// Process stores the information about a process created by StartProcess.
type Process struct {
Pid int
handle uintptr
isdone uint32 // process has been successfully waited on, non zero if true
func newProcess(pid int, handle uintptr) *Process {
p := &Process{Pid: pid, handle: handle}
runtime.SetFinalizer(p, (*Process).Release)
return p
func (p *Process) setDone() {
atomic.StoreUint32(&p.isdone, 1)
func (p *Process) done() bool {
return atomic.LoadUint32(&p.isdone) > 0
// ProcAttr holds the attributes that will be applied to a new process
// started by StartProcess.
type ProcAttr struct {
// If Dir is non-empty, the child changes into the directory before
// creating the process.
Dir string
// If Env is non-nil, it gives the environment variables for the
// new process in the form returned by Environ.
// If it is nil, the result of Environ will be used.
Env []string
// Files specifies the open files inherited by the new process. The
// first three entries correspond to standard input, standard output, and
// standard error. An implementation may support additional entries,
// depending on the underlying operating system. A nil entry corresponds
// to that file being closed when the process starts.
Files []*File
// Operating system-specific process creation attributes.
// Note that setting this field means that your program
// may not execute properly or even compile on some
// operating systems.
Sys *syscall.SysProcAttr
// A Signal represents an operating system signal.
// The usual underlying implementation is operating system-dependent:
// on Unix it is syscall.Signal.
type Signal interface {
String() string
Signal() // to distinguish from other Stringers
// Getpid returns the process id of the caller.
func Getpid() int { return syscall.Getpid() }
// Getppid returns the process id of the caller's parent.
func Getppid() int { return syscall.Getppid() }