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
29 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
30 * All rights reserved.
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. Neither the name of the author nor the names of any co-contributors
41 * may be used to endorse or promote products derived from this software
42 * without specific prior written permission.
44 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
61 #include <sys/syscall.h>
62 #include "namespace.h"
70 #include "un-namespace.h"
72 #include "libc_private.h"
73 #include "rtld_lock.h"
74 #include "thr_private.h"
76 __weak_reference(_pthread_atfork, pthread_atfork);
79 _pthread_atfork(void (*prepare)(void), void (*parent)(void),
82 struct pthread *curthread;
83 struct pthread_atfork *af;
87 if ((af = malloc(sizeof(struct pthread_atfork))) == NULL)
90 curthread = _get_curthread();
91 af->prepare = prepare;
94 THR_CRITICAL_ENTER(curthread);
95 _thr_rwl_wrlock(&_thr_atfork_lock);
96 TAILQ_INSERT_TAIL(&_thr_atfork_list, af, qe);
97 _thr_rwl_unlock(&_thr_atfork_lock);
98 THR_CRITICAL_LEAVE(curthread);
103 __pthread_cxa_finalize(struct dl_phdr_info *phdr_info)
105 atfork_head temp_list = TAILQ_HEAD_INITIALIZER(temp_list);
106 struct pthread *curthread;
107 struct pthread_atfork *af, *af1;
111 curthread = _get_curthread();
112 THR_CRITICAL_ENTER(curthread);
113 _thr_rwl_wrlock(&_thr_atfork_lock);
114 TAILQ_FOREACH_SAFE(af, &_thr_atfork_list, qe, af1) {
115 if (__elf_phdr_match_addr(phdr_info, af->prepare) ||
116 __elf_phdr_match_addr(phdr_info, af->parent) ||
117 __elf_phdr_match_addr(phdr_info, af->child)) {
118 TAILQ_REMOVE(&_thr_atfork_list, af, qe);
119 TAILQ_INSERT_TAIL(&temp_list, af, qe);
122 _thr_rwl_unlock(&_thr_atfork_lock);
123 THR_CRITICAL_LEAVE(curthread);
124 while ((af = TAILQ_FIRST(&temp_list)) != NULL) {
125 TAILQ_REMOVE(&temp_list, af, qe);
128 _thr_tsd_unload(phdr_info);
129 _thr_sigact_unload(phdr_info);
132 __weak_reference(__thr_fork, _fork);
137 struct pthread *curthread;
138 struct pthread_atfork *af;
140 int errsave, cancelsave;
142 int rtld_locks[MAX_RTLD_LOCKS];
144 if (!_thr_is_inited())
145 return (__sys_fork());
147 curthread = _get_curthread();
148 cancelsave = curthread->no_cancel;
149 curthread->no_cancel = 1;
150 _thr_rwl_rdlock(&_thr_atfork_lock);
152 /* Run down atfork prepare handlers. */
153 TAILQ_FOREACH_REVERSE(af, &_thr_atfork_list, atfork_head, qe) {
154 if (af->prepare != NULL)
159 * Block all signals until we reach a safe point.
161 _thr_signal_block(curthread);
162 _thr_signal_prefork();
165 * All bets are off as to what should happen soon if the parent
166 * process was not so kindly as to set up pthread fork hooks to
167 * relinquish all running threads.
169 if (_thr_isthreaded() != 0) {
172 __thr_pshared_atfork_pre();
173 _rtld_atfork_pre(rtld_locks);
179 * Fork a new process.
180 * There is no easy way to pre-resolve the __sys_fork symbol
181 * without performing the fork. Use the syscall(2)
182 * indirection, the syscall symbol is resolved in
183 * _thr_rtld_init() with side-effect free call.
185 ret = syscall(SYS_fork);
189 curthread->cancel_pending = 0;
190 curthread->flags &= ~(THR_FLAGS_NEED_SUSPEND|THR_FLAGS_DETACHED);
193 * Thread list will be reinitialized, and later we call
194 * _libpthread_init(), it will add us back to list.
196 curthread->tlflags &= ~TLFLAGS_IN_TDLIST;
198 /* child is a new kernel thread. */
199 thr_self(&curthread->tid);
201 /* clear other threads locked us. */
202 _thr_umutex_init(&curthread->lock);
203 _mutex_fork(curthread);
205 _thr_signal_postfork_child();
208 _rtld_atfork_post(rtld_locks);
209 __thr_pshared_atfork_post();
213 /* reinitalize library. */
214 _libpthread_init(curthread);
216 /* atfork is reinitialized by _libpthread_init()! */
217 _thr_rwl_rdlock(&_thr_atfork_lock);
225 /* Ready to continue, unblock signals. */
226 _thr_signal_unblock(curthread);
228 /* Run down atfork child handlers. */
229 TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
230 if (af->child != NULL)
233 _thr_rwlock_unlock(&_thr_atfork_lock);
234 curthread->no_cancel = cancelsave;
239 _thr_signal_postfork();
242 _rtld_atfork_post(rtld_locks);
243 __thr_pshared_atfork_post();
247 /* Ready to continue, unblock signals. */
248 _thr_signal_unblock(curthread);
250 /* Run down atfork parent handlers. */
251 TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
252 if (af->parent != NULL)
256 _thr_rwlock_unlock(&_thr_atfork_lock);
257 curthread->no_cancel = cancelsave;
258 /* test async cancel */
259 if (curthread->cancel_async)
260 _thr_testcancel(curthread);