1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package os 6 7 import ( 8 "runtime" 9 "sync/atomic" 10 "syscall" 11 ) 12 13 // Process stores the information about a process created by StartProcess. 14 type Process struct { 15 Pid int 16 handle uintptr // handle is accessed atomically on Windows 17 isdone uint32 // process has been successfully waited on, non zero if true 18 } 19 20 func newProcess(pid int, handle uintptr) *Process { 21 p := &Process{Pid: pid, handle: handle} 22 runtime.SetFinalizer(p, (*Process).Release) 23 return p 24 } 25 26 func (p *Process) setDone() { 27 atomic.StoreUint32(&p.isdone, 1) 28 } 29 30 func (p *Process) done() bool { 31 return atomic.LoadUint32(&p.isdone) > 0 32 } 33 34 // ProcAttr holds the attributes that will be applied to a new process 35 // started by StartProcess. 36 type ProcAttr struct { 37 // If Dir is non-empty, the child changes into the directory before 38 // creating the process. 39 Dir string 40 // If Env is non-nil, it gives the environment variables for the 41 // new process in the form returned by Environ. 42 // If it is nil, the result of Environ will be used. 43 Env []string 44 // Files specifies the open files inherited by the new process. The 45 // first three entries correspond to standard input, standard output, and 46 // standard error. An implementation may support additional entries, 47 // depending on the underlying operating system. A nil entry corresponds 48 // to that file being closed when the process starts. 49 Files []*File 50 51 // Operating system-specific process creation attributes. 52 // Note that setting this field means that your program 53 // may not execute properly or even compile on some 54 // operating systems. 55 Sys *syscall.SysProcAttr 56 } 57 58 // A Signal represents an operating system signal. 59 // The usual underlying implementation is operating system-dependent: 60 // on Unix it is syscall.Signal. 61 type Signal interface { 62 String() string 63 Signal() // to distinguish from other Stringers 64 } 65 66 // Getpid returns the process id of the caller. 67 func Getpid() int { return syscall.Getpid() } 68 69 // Getppid returns the process id of the caller's parent. 70 func Getppid() int { return syscall.Getppid() } 71
