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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 
51 int
daemon(int nochdir,int noclose)52 daemon(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