125 lines
3.8 KiB
C
125 lines
3.8 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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/*
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* For a while, allow libpthread to work with a libc that doesn't
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* export the malloc lock.
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*/
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#pragma weak __malloc_lock
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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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if (!_kse_isthreaded())
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return (__sys_fork());
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curthread = _get_curthread();
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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) && (__malloc_lock != NULL)) {
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_spinlock(__malloc_lock);
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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) && (__malloc_lock != NULL)) {
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_spinunlock(__malloc_lock);
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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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