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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)daemon.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: src/lib/libc/gen/daemon.c,v 1.8 2007/01/09 00:27:53 imp Exp $");
35
36#ifndef VARIANT_PRE1050
37#include <mach/mach.h>
38#include <servers/bootstrap.h>
39#endif /* !VARIANT_PRE1050 */
40#include "namespace.h"
41#include <errno.h>
42#include <fcntl.h>
43#include <paths.h>
44#include <stdlib.h>
45#include <signal.h>
46#include <unistd.h>
47#include "un-namespace.h"
48
49#ifndef VARIANT_PRE1050
50static void
51move_to_root_bootstrap(void)
52{
53	mach_port_t parent_port = 0;
54	mach_port_t previous_port = 0;
55
56	do {
57		if (previous_port) {
58			mach_port_deallocate(mach_task_self(), previous_port);
59			previous_port = parent_port;
60		} else {
61			previous_port = bootstrap_port;
62		}
63
64		if (bootstrap_parent(previous_port, &parent_port) != 0) {
65			return;
66		}
67	} while (parent_port != previous_port);
68
69	task_set_bootstrap_port(mach_task_self(), parent_port);
70	bootstrap_port = parent_port;
71}
72#endif /* !VARIANT_PRE1050 */
73
74int daemon(int, int) __DARWIN_1050(daemon);
75
76int
77daemon(nochdir, noclose)
78	int nochdir, noclose;
79{
80	struct sigaction osa, sa;
81	int fd;
82	pid_t newgrp;
83	int oerrno;
84	int osa_ok;
85
86	/* A SIGHUP may be thrown when the parent exits below. */
87	sigemptyset(&sa.sa_mask);
88	sa.sa_handler = SIG_IGN;
89	sa.sa_flags = 0;
90	osa_ok = _sigaction(SIGHUP, &sa, &osa);
91#ifndef VARIANT_PRE1050
92	move_to_root_bootstrap();
93#endif /* !VARIANT_PRE1050 */
94	switch (fork()) {
95	case -1:
96		return (-1);
97	case 0:
98		break;
99	default:
100		_exit(0);
101	}
102
103	newgrp = setsid();
104	oerrno = errno;
105	if (osa_ok != -1)
106		_sigaction(SIGHUP, &osa, NULL);
107
108	if (newgrp == -1) {
109		errno = oerrno;
110		return (-1);
111	}
112
113	if (!nochdir)
114		(void)chdir("/");
115
116	if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
117		(void)_dup2(fd, STDIN_FILENO);
118		(void)_dup2(fd, STDOUT_FILENO);
119		(void)_dup2(fd, STDERR_FILENO);
120		if (fd > 2)
121			(void)_close(fd);
122	}
123	return (0);
124}
125