1/*	$OpenBSD: daemon.c,v 1.6 2005/08/08 08:05:33 espie Exp $ */
2/*-
3 * Copyright (c) 1990, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/* OPENBSD ORIGINAL: lib/libc/gen/daemon.c */
32
33#include "includes.h"
34
35#ifndef HAVE_DAEMON
36
37#include <sys/types.h>
38
39#ifdef HAVE_SYS_STAT_H
40# include <sys/stat.h>
41#endif
42
43#ifdef HAVE_FCNTL_H
44# include <fcntl.h>
45#endif
46
47#ifdef HAVE_UNISTD_H
48# include <unistd.h>
49#endif
50
51int
52daemon(int nochdir, int noclose)
53{
54	int fd;
55
56	switch (fork()) {
57	case -1:
58		return (-1);
59	case 0:
60		break;
61	default:
62		_exit(0);
63	}
64
65	if (setsid() == -1)
66		return (-1);
67
68	if (!nochdir)
69		(void)chdir("/");
70
71	if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
72		(void)dup2(fd, STDIN_FILENO);
73		(void)dup2(fd, STDOUT_FILENO);
74		(void)dup2(fd, STDERR_FILENO);
75		if (fd > 2)
76			(void)close (fd);
77	}
78	return (0);
79}
80
81#endif /* !HAVE_DAEMON */
82
83