51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
package main
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import (
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"fmt"
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"os"
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"os/exec"
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"os/signal"
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"syscall"
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"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// The child sends us USR1 if the mount was successful
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func exitOnUsr1() {
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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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// forkChild - execute ourselves once again, this time with the "-fg" flag, and
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// wait for SIGUSR1 or child exit.
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// This is a workaround for the missing true fork function in Go.
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func forkChild() int {
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go exitOnUsr1()
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name := os.Args[0]
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newArgs := []string{"-fg", fmt.Sprintf("-notifypid=%d", os.Getpid())}
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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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tlog.Fatal.Printf("forkChild: starting %s failed: %v\n", name, err)
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return 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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tlog.Fatal.Printf("forkChild: wait returned an unknown error: %v\n", err)
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return 1
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}
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// The child exited with 0 - let's do the same.
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return 0
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}
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