fork.go

fork.go

package main

import (
 "syscall"
 "os"
 "time"
 "fmt"
)

func daemon (nochdir, noclose int) int {
    var ret uintptr
    //var err uintptr

    ret,ret2,e := syscall.Syscall(syscall.SYS_FORK, 0, 0, 0)
    if e != 0 { return -1 }
            fmt.Printf("Ret %v %v \n", ret, ret2)
            time.Sleep(10*time.Second)
    switch (ret) {
        case 0:
            break
        default:
            fmt.Printf("Ret %v %v \n", ret, ret2)
            os.Exit (0)
    }

    _, r := syscall.Setsid ()
    if r != nil { return -1 }
    if (nochdir == 0) { os.Chdir("/") }

    if noclose == 0 {
        f, e := os.Open ("/dev/null")
        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, 0)
}