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-rw-r--r--openbsd-compat/daemon.c81
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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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "includes.h"
35
36#ifndef HAVE_DAEMON
37
38#if defined(LIBC_SCCS) && !defined(lint)
39static char rcsid[] = "$OpenBSD: daemon.c,v 1.2 1996/08/19 08:22:13 tholo Exp $";
40#endif /* LIBC_SCCS and not lint */
41
42int
43daemon(nochdir, noclose)
44 int nochdir, noclose;
45{
46 int fd;
47
48 switch (fork()) {
49 case -1:
50 return (-1);
51 case 0:
52 break;
53 default:
54#ifdef HAVE_CYGWIN
55 /*
56 * This sleep avoids a race condition which kills the
57 * child process if parent is started by a NT/W2K service.
58 */
59 sleep(1);
60#endif
61 _exit(0);
62 }
63
64 if (setsid() == -1)
65 return (-1);
66
67 if (!nochdir)
68 (void)chdir("/");
69
70 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
71 (void)dup2(fd, STDIN_FILENO);
72 (void)dup2(fd, STDOUT_FILENO);
73 (void)dup2(fd, STDERR_FILENO);
74 if (fd > 2)
75 (void)close (fd);
76 }
77 return (0);
78}
79
80#endif /* !HAVE_DAEMON */
81