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