package main
import (
"syscall"
"os"
"log"
)
func daemon(nochdir, noclose int) int {
var ret, ret2 uintptr
var err uintptr
darwin := syscall.OS == "darwin"
// already a daemon
if syscall.Getppid() == 1 {
return 0
}
// fork off the parent process
ret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)
if err != 0 {
return -1
}
// failure
if ret2 < 0 {
os.Exit(-1)
}
// handle exception for darwin
if 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 process
s_ret, s_errno := syscall.Setsid()
if s_errno != 0 {
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(fd, os.Stdin.Fd())
syscall.Dup2(fd, os.Stdout.Fd())
syscall.Dup2(fd, os.Stderr.Fd())
}
}
return 0
}
// usage example: daemon(0, 0)
参考：http://code.google.com/p/go/issues/detail?id=227
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