2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Neither the name of the author nor the names of any co-contributors
12 * may be used to endorse or promote products derived from this software
13 * without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
32 * All rights reserved.
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. Neither the name of the author nor the names of any co-contributors
43 * may be used to endorse or promote products derived from this software
44 * without specific prior written permission.
46 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 #include "namespace.h"
67 #include "un-namespace.h"
69 #include "libc_private.h"
70 #include "rtld_lock.h"
71 #include "thr_private.h"
73 __weak_reference(_pthread_atfork, pthread_atfork);
76 _pthread_atfork(void (*prepare)(void), void (*parent)(void),
79 struct pthread *curthread;
80 struct pthread_atfork *af;
84 if ((af = malloc(sizeof(struct pthread_atfork))) == NULL)
87 curthread = _get_curthread();
88 af->prepare = prepare;
91 THR_UMUTEX_LOCK(curthread, &_thr_atfork_lock);
92 TAILQ_INSERT_TAIL(&_thr_atfork_list, af, qe);
93 THR_UMUTEX_UNLOCK(curthread, &_thr_atfork_lock);
97 __weak_reference(_fork, fork);
104 struct pthread *curthread;
105 struct pthread_atfork *af;
109 int rtld_locks[MAX_RTLD_LOCKS];
111 if (!_thr_is_inited())
112 return (__sys_fork());
114 curthread = _get_curthread();
116 THR_UMUTEX_LOCK(curthread, &_thr_atfork_lock);
118 /* Run down atfork prepare handlers. */
119 TAILQ_FOREACH_REVERSE(af, &_thr_atfork_list, atfork_head, qe) {
120 if (af->prepare != NULL)
125 * All bets are off as to what should happen soon if the parent
126 * process was not so kindly as to set up pthread fork hooks to
127 * relinquish all running threads.
129 if (_thr_isthreaded() != 0) {
132 _rtld_atfork_pre(rtld_locks);
138 * Block all signals until we reach a safe point.
140 _thr_signal_block(curthread);
142 /* Fork a new process: */
143 if ((ret = __sys_fork()) == 0) {
146 curthread->cancel_pending = 0;
147 curthread->flags &= ~THR_FLAGS_NEED_SUSPEND;
150 * Thread list will be reinitialized, and later we call
151 * _libpthread_init(), it will add us back to list.
153 curthread->tlflags &= ~(TLFLAGS_IN_TDLIST | TLFLAGS_DETACHED);
155 /* child is a new kernel thread. */
156 thr_self(&curthread->tid);
158 /* clear other threads locked us. */
159 _thr_umutex_init(&curthread->lock);
160 _thr_umutex_init(&_thr_atfork_lock);
163 _rtld_atfork_post(rtld_locks);
166 /* reinitialize libc spinlocks. */
167 _thr_spinlock_init();
168 _mutex_fork(curthread);
170 /* reinitalize library. */
171 _libpthread_init(curthread);
173 /* Ready to continue, unblock signals. */
174 _thr_signal_unblock(curthread);
182 /* Run down atfork child handlers. */
183 TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
184 if (af->child != NULL)
191 /* Ready to continue, unblock signals. */
192 _thr_signal_unblock(curthread);
195 _rtld_atfork_post(rtld_locks);
199 /* Run down atfork parent handlers. */
200 TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
201 if (af->parent != NULL)
205 THR_UMUTEX_UNLOCK(curthread, &_thr_atfork_lock);
209 /* Return the process ID: */