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