1/*	$NetBSD: daemon.c,v 1.2 2017/01/28 21:31:50 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)daemon.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35
36#include <config.h>
37
38#ifndef HAVE_DAEMON
39
40#ifdef HAVE_FCNTL_H
41#include <fcntl.h>
42#endif
43#ifdef HAVE_PATHS_H
44#include <paths.h>
45#endif
46#ifdef HAVE_UNISTD_H
47#include <unistd.h>
48#endif
49
50#include <krb5/roken.h>
51
52ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
53daemon(int nochdir, int noclose)
54{
55    int fd;
56
57    switch (fork()) {
58    case -1:
59	return (-1);
60    case 0:
61	break;
62    default:
63	_exit(0);
64    }
65
66    if (setsid() == -1)
67	return (-1);
68
69    if (!nochdir)
70	chdir("/");
71
72    if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
73	dup2(fd, STDIN_FILENO);
74	dup2(fd, STDOUT_FILENO);
75	dup2(fd, STDERR_FILENO);
76	if (fd > 2)
77	    (void) close(fd);
78    }
79    return (0);
80}
81
82#endif /* HAVE_DAEMON */
83