daemon.c revision 178825 
1/*-
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)daemon.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36#endif
37
38RCSID("$Id: daemon.c 14773 2005-04-12 11:29:18Z lha $");
39
40#ifndef HAVE_DAEMON
41
42#ifdef HAVE_FCNTL_H
43#include <fcntl.h>
44#endif
45#ifdef HAVE_PATHS_H
46#include <paths.h>
47#endif
48#ifdef HAVE_UNISTD_H
49#include <unistd.h>
50#endif
51
52#include "roken.h"
53
54int ROKEN_LIB_FUNCTION
55daemon(int nochdir, int noclose)
56{
57    int fd;
58
59    switch (fork()) {
60    case -1:
61	return (-1);
62    case 0:
63	break;
64    default:
65	_exit(0);
66    }
67
68    if (setsid() == -1)
69	return (-1);
70
71    if (!nochdir)
72	chdir("/");
73
74    if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
75	dup2(fd, STDIN_FILENO);
76	dup2(fd, STDOUT_FILENO);
77	dup2(fd, STDERR_FILENO);
78	if (fd > 2)
79	    close (fd);
80    }
81    return (0);
82}
83
84#endif /* HAVE_DAEMON */
85