/
daemon.go
45 lines (37 loc) · 892 Bytes
/
daemon.go
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package daemon
import (
"fmt"
"os"
"syscall"
)
func Daemon(nochdir, noclose int) (int, error) {
// already a daemon
if syscall.Getppid() == 1 {
/* Change the file mode mask */
syscall.Umask(0)
if nochdir == 0 {
os.Chdir("/")
}
return 0, nil
}
files := make([]*os.File, 3, 6)
if noclose == 0 {
nullDev, err := os.OpenFile("/dev/null", 0, 0)
if err != nil {
return 1, err
}
files[0], files[1], files[2] = nullDev, nullDev, nullDev
} else {
files[0], files[1], files[2] = os.Stdin, os.Stdout, os.Stderr
}
dir, _ := os.Getwd()
sysattrs := syscall.SysProcAttr{Setsid: true}
attrs := os.ProcAttr{Dir: dir, Env: os.Environ(), Files: files, Sys: &sysattrs}
proc, err := os.StartProcess(os.Args[0], os.Args, &attrs)
if err != nil {
return -1, fmt.Errorf("can't create process %s: %s", os.Args[0], err)
}
proc.Release()
os.Exit(0)
return 0, nil
}