e62165c8b0
used LIBTHREAD_1_0 as its version definition, but now needs to define its symbols in the same namespace used by libc. The compatibility hooks allows you to use libraries and binaries built and linked to libpthread before libc was built with symbol versioning. The shims can be removed if libpthread is given a version bump. Reviewed by: davidxu
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <spinlock.h>
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#include <sys/signalvar.h>
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#include "libc_private.h"
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#include "thr_private.h"
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LT10_COMPAT_PRIVATE(_fork);
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LT10_COMPAT_DEFAULT(fork);
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__weak_reference(_fork, fork);
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pid_t
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_fork(void)
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{
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sigset_t sigset, oldset;
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struct pthread *curthread;
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struct pthread_atfork *af;
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pid_t ret;
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int errsave;
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curthread = _get_curthread();
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if (!_kse_isthreaded()) {
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SIGFILLSET(sigset);
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__sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
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ret = __sys_fork();
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if (ret == 0)
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/* Child */
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__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask,
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NULL);
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else
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__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
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return (ret);
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}
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/*
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* Masks all signals until we reach a safe point in
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* _kse_single_thread, and the signal masks will be
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* restored in that function, for M:N thread, all
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* signals were already masked in kernel atomically,
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* we only need to do this for bound thread.
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*/
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if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
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SIGFILLSET(sigset);
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__sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
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}
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_pthread_mutex_lock(&_thr_atfork_mutex);
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/* Run down atfork prepare handlers. */
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TAILQ_FOREACH_REVERSE(af, &_thr_atfork_list, atfork_head, qe) {
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if (af->prepare != NULL)
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af->prepare();
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}
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/* Fork a new process: */
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if (_kse_isthreaded() != 0) {
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_malloc_prefork();
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}
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if ((ret = __sys_fork()) == 0) {
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/* Child process */
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errsave = errno;
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/* Kernel signal mask is restored in _kse_single_thread */
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_kse_single_thread(curthread);
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/* Run down atfork child handlers. */
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TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
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if (af->child != NULL)
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af->child();
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}
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_thr_mutex_reinit(&_thr_atfork_mutex);
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} else {
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if (_kse_isthreaded() != 0) {
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_malloc_postfork();
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}
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errsave = errno;
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if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
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__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
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}
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/* Run down atfork parent handlers. */
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TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
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if (af->parent != NULL)
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af->parent();
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}
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_pthread_mutex_unlock(&_thr_atfork_mutex);
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}
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errno = errsave;
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/* Return the process ID: */
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return (ret);
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}
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