// +build !darwin

package dbus

import (
	"io"
	"os"
	"syscall"
)

func (t *unixTransport) SendNullByte() error {
	ucred := &syscall.Ucred{Pid: int32(os.Getpid()), Uid: uint32(os.Getuid()), Gid: uint32(os.Getgid())}
	b := syscall.UnixCredentials(ucred)
	_, oobn, err := t.UnixConn.WriteMsgUnix([]byte{0}, b, nil)
	if err != nil {
		return err
	}
	if oobn != len(b) {
		return io.ErrShortWrite
	}
	return nil
}