Go語言daemon啟動的解決方案.linux平台

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

1、使用nohup ./commond & 這種方法最簡單.

2、這種方法可以使用訊號.

<pre name="code" class="html">package mainimport ("fmt""os""os/signal""syscall""time")func main() {if os.Getppid() != 1 {args := append([]string{os.Args[0]}, os.Args[1:]...)os.StartProcess(os.Args[0], args, &os.ProcAttr{Files: []*os.File{os.Stdin, os.Stdout, os.Stderr}})return}go func() {var c chan os.Signal = make(chan os.Signal, 1)go signal.Notify(c, os.Kill, os.Interrupt, syscall.SIGHUP, syscall.SIGUSR2)File, err := os.Create("/tmp/收到的訊號.")defer File.Close()for {s := <-cFile.WriteString(s.String())}}()F, err := os.Create("/tmp/log")if err != nil {fmt.Println(err)return}defer F.Close()for {fmt.Fprintln(F, "Hello World")time.Sleep(3e9)}}

3、這種方法比較底層,但是不能使用訊號.

package mainimport ("fmt""log""os""os/signal""runtime""syscall""time")func daemon(nochdir, noclose int) int {var ret, ret2 uintptrvar err syscall.Errnodarwin := runtime.GOOS == "darwin"// already a daemonif syscall.Getppid() == 1 {return 0}// fork off the parent processret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)if err != 0 {return -1}// failureif ret2 < 0 {os.Exit(-1)}// handle exception for darwinif darwin && ret2 == 1 {ret = 0}// if we got a good PID, then we call exit the parent process.if ret > 0 {os.Exit(0)}/* Change the file mode mask */_ = syscall.Umask(0)// create a new SID for the child processs_ret, s_errno := syscall.Setsid()if s_errno != nil {log.Printf("Error: syscall.Setsid errno: %d", s_errno)}if s_ret < 0 {return -1}if nochdir == 0 {os.Chdir("/")}if noclose == 0 {f, e := os.OpenFile("/dev/null", os.O_RDWR, 0)if e == nil {fd := f.Fd()syscall.Dup2(int(fd), int(os.Stdin.Fd()))syscall.Dup2(int(fd), int(os.Stdout.Fd()))syscall.Dup2(int(fd), int(os.Stderr.Fd()))}}return 0}func main() {daemon(0, 1)for {fmt.Println("hello")time.Sleep(1 * time.Second)}}