132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
/*
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* Copyright (c) 1995 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 REGENTS 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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*/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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pid_t
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fork(void)
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{
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int flags;
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int status;
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pid_t ret;
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pthread_t pthread;
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pthread_t pthread_next;
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/* Block signals to avoid being interrupted at a bad time: */
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_thread_kern_sig_block(&status);
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/* Fork a new process: */
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if ((ret = _thread_sys_fork()) <= 0) {
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/* Parent process or error. Nothing to do here. */
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} else {
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/* Close the pthread kernel pipe: */
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_thread_sys_close(_thread_kern_pipe[0]);
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_thread_sys_close(_thread_kern_pipe[1]);
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/* Reset signals pending for the running thread: */
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memset(_thread_run->sigpend, 0, sizeof(_thread_run->sigpend));
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/*
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* Create a pipe that is written to by the signal handler to
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* prevent signals being missed in calls to
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* _thread_sys_select:
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*/
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if (_thread_sys_pipe(_thread_kern_pipe) != 0) {
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/* Cannot create pipe, so abort: */
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PANIC("Cannot create pthread kernel pipe for forked process");
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}
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/* Get the flags for the read pipe: */
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else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
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/* Abort this application: */
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abort();
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}
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/* Make the read pipe non-blocking: */
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else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
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/* Abort this application: */
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abort();
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}
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/* Get the flags for the write pipe: */
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else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
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/* Abort this application: */
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abort();
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}
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/* Make the write pipe non-blocking: */
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else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
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/* Abort this application: */
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abort();
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} else {
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/* Point to the first thread in the list: */
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pthread = _thread_link_list;
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/*
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* Enter a loop to remove all threads other than
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* the running thread from the thread list:
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*/
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while (pthread != NULL) {
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pthread_next = pthread->nxt;
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if (pthread == _thread_run) {
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_thread_link_list = pthread;
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pthread->nxt = NULL;
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} else {
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if (pthread->attr.stackaddr_attr ==
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NULL && pthread->stack != NULL) {
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/*
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* Free the stack of the
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* dead thread:
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*/
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free(pthread->stack);
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}
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if (pthread->specific_data != NULL)
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free(pthread->specific_data);
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free(pthread);
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}
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/* Point to the next thread: */
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pthread = pthread_next;
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}
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}
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}
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/* Unblock signals: */
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_thread_kern_sig_unblock(&status);
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/* Return the process ID: */
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return (ret);
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}
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#endif
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