168 lines
5.0 KiB
C
168 lines
5.0 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 <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.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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void
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_thread_sig_handler(int sig, int code, struct sigcontext * scp)
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{
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char c;
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int i;
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pthread_t pthread;
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/*
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* Check if the pthread kernel has unblocked signals (or is about to)
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* and was on its way into a _thread_sys_select when the current
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* signal interrupted it:
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*/
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if (_thread_kern_in_select) {
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/* Cast the signal number to a character variable: */
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c = sig;
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/*
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* Write the signal number to the kernel pipe so that it will
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* be ready to read when this signal handler returns. This
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* means that the _thread_sys_select call will complete
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* immediately.
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*/
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if (_thread_sys_write(_thread_kern_pipe[1], &c, 1) != 1) {
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}
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}
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/* Check if the signal requires a dump of thread information: */
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if (sig == SIGINFO) {
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/* Dump thread information to file: */
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_thread_dump_info();
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} else {
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/* Handle depending on signal type: */
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switch (sig) {
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/* Interval timer used for timeslicing: */
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case SIGVTALRM:
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/*
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* Don't add the signal to any thread. Just want to
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* call the scheduler:
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*/
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break;
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/* Child termination: */
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case SIGCHLD:
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/*
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* Enter a loop to process each thread in the linked
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* list:
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*/
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for (pthread = _thread_link_list; pthread != NULL;
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pthread = pthread->nxt) {
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/*
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* Add the signal to the set of pending
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* signals:
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*/
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pthread->sigpend[sig] += 1;
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if (pthread->state == PS_WAIT_WAIT) {
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/* Reset the error: */
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/* There should be another flag so that this is not required! ### */
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_thread_seterrno(pthread, 0);
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/* Change the state of the thread to run: */
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PTHREAD_NEW_STATE(pthread,PS_RUNNING);
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}
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}
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/*
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* Go through the file list and set all files
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* to non-blocking again in case the child
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* set some of them to block. Sigh.
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*/
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for (i = 0; i < _thread_dtablesize; i++) {
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/* Check if this file is used: */
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if (_thread_fd_table[i] != NULL) {
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/* Set the file descriptor to non-blocking: */
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_thread_sys_fcntl(i, F_SETFL, _thread_fd_table[i]->flags | O_NONBLOCK);
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}
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}
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break;
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/* Signals specific to the running thread: */
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case SIGBUS:
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case SIGEMT:
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case SIGFPE:
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case SIGILL:
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case SIGPIPE:
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case SIGSEGV:
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case SIGSYS:
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/* Add the signal to the set of pending signals: */
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_thread_run->sigpend[sig] += 1;
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break;
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/* Signals to send to all threads: */
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default:
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/*
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* Enter a loop to process each thread in the linked
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* list:
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*/
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for (pthread = _thread_link_list; pthread != NULL;
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pthread = pthread->nxt) {
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/*
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* Add the signal to the set of pending
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* signals:
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*/
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pthread->sigpend[sig] += 1;
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}
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break;
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}
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/* Check if the kernel is not locked: */
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if (_thread_run != &_thread_kern_thread) {
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/*
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* Schedule the next thread. This function is not
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* expected to return because it will do a longjmp
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* instead.
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*/
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_thread_kern_sched(scp);
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/*
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* This point should not be reached, so abort the
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* process:
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*/
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PANIC("Returned to signal function from scheduler");
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}
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}
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/* Returns nothing. */
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return;
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}
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#endif
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