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package main
import (
"fmt"
"log"
"log/syslog"
"os"
"os/exec"
"os/signal"
"syscall"
"github.com/rfjakob/gocryptfs/cryptfs"
)
// The child sends us USR1 if the mount was successful
func exitOnUsr1() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR1)
<-c
os.Exit(0)
}
// forkChild - execute ourselves once again, this time with the "-f" flag, and
// wait for SIGUSR1 or child exit.
// This is a workaround for the missing true fork function in Go.
func forkChild() {
go exitOnUsr1()
name := os.Args[0]
newArgs := []string{"-f", fmt.Sprintf("-notifypid=%d", os.Getpid())}
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("forkChild: starting %s failed: %v\n", name, err)
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("forkChild: wait returned an unknown error: %v\n", err)
os.Exit(1)
}
// The child exited with 0 - let's do the same.
os.Exit(0)
}
// Switch one Logger to syslog
func switchToSyslog(l *log.Logger, p syslog.Priority) {
w, err := syslog.New(p, PROGRAM_NAME)
if err != nil {
cryptfs.Warn.Printf("Cannot switch 0x%02x to syslog: %v", p, err)
} else {
l.SetOutput(w)
}
}
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