1 #if defined(LIBC_SCCS) && !defined(lint)
2 static const char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93";
3 static const char rcsid[] = "$Id: daemon.c,v 1.2 2005/04/27 04:56:10 sra Exp $";
4 #endif /* LIBC_SCCS and not lint */
5
6 /*
7 * Copyright (c) 1990, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include "port_before.h"
40
41 #include <fcntl.h>
42 #include <paths.h>
43 #include <unistd.h>
44
45 #include "port_after.h"
46
47 #ifndef NEED_DAEMON
48 int __bind_daemon__;
49 #else
50
51 int
daemon(int nochdir,int noclose)52 daemon(int nochdir, int noclose) {
53 int fd;
54
55 switch (fork()) {
56 case -1:
57 return (-1);
58 case 0:
59 break;
60 default:
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 #endif
80
81 /*! \file */
82