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package main
import (
"syscall"
"os/exec"
"os"
"fmt"
"os/signal"
)
// The child sends us USR1 if the mount was successful
func waitForUsr1() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR1)
<-c
os.Exit(0)
}
// daemonize - execute ourselves once again, this time with the "-f" flag, and
// wait for SIGUSR1.
func daemonize() {
go waitForUsr1()
name := os.Args[0]
newArgs := []string{"-f"}
newArgs = append(newArgs, os.Args[1:]...)
c := exec.Command(name, newArgs...)
c.Stdout = os.Stdout
c.Stderr = os.Stderr
c.Stdin = os.Stdin
err := c.Start()
if err != nil {
fmt.Printf("daemonize: starting %s failed: %v\n", name)
os.Exit(1)
}
err = c.Wait()
if err != nil {
if exiterr, ok := err.(*exec.ExitError); ok {
if waitstat, ok := exiterr.Sys().(syscall.WaitStatus); ok {
os.Exit(waitstat.ExitStatus())
}
}
fmt.Printf("daemonize: wait returned an unknown error: %v\n", err)
os.Exit(1)
}
// The child exited with 0 - let's do the same.
os.Exit(0)
}
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