FreeBSD-5.3/lib/libc_r/test/sigsuspend_d.c
/*
* Copyright (c) 1998 Daniel M. Eischen <eischen@vigrid.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Daniel M. Eischen.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY DANIEL M. EISCHEN AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/lib/libc_r/test/sigsuspend_d.c,v 1.1 2000/04/24 21:07:39 jasone Exp $
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#if defined(_LIBC_R_)
#include <pthread_np.h>
#endif
static int sigcounts[NSIG + 1];
static int sigfifo[NSIG + 1];
static int fifo_depth = 0;
static sigset_t suspender_mask;
static pthread_t suspender_tid;
static void *
sigsuspender (void *arg)
{
int save_count, status, i;
sigset_t run_mask;
/* Run with all signals blocked. */
sigfillset (&run_mask);
sigprocmask (SIG_SETMASK, &run_mask, NULL);
/* Allow these signals to wake us up during a sigsuspend. */
sigfillset (&suspender_mask); /* Default action */
sigdelset (&suspender_mask, SIGINT); /* terminate */
sigdelset (&suspender_mask, SIGHUP); /* terminate */
sigdelset (&suspender_mask, SIGQUIT); /* create core image */
sigdelset (&suspender_mask, SIGURG); /* ignore */
sigdelset (&suspender_mask, SIGIO); /* ignore */
sigdelset (&suspender_mask, SIGUSR2); /* terminate */
while (sigcounts[SIGINT] == 0) {
save_count = sigcounts[SIGUSR2];
status = sigsuspend (&suspender_mask);
if ((status == 0) || (errno != EINTR)) {
fprintf (stderr, "Unable to suspend for signals, "
"errno %d, return value %d\n",
errno, status);
exit (1);
}
for (i = 0; i < fifo_depth; i++)
fprintf (stderr, "Sigsuspend woke up by signal %d\n",
sigfifo[i]);
fifo_depth = 0;
}
pthread_exit (arg);
return (NULL);
}
static void
sighandler (int signo)
{
sigset_t set, suspend_set;
pthread_t self;
if ((signo >= 0) && (signo <= NSIG))
sigcounts[signo]++;
/*
* If we are running on behalf of the suspender thread,
* ensure that we have the correct mask set.
*/
self = pthread_self ();
if (self == suspender_tid) {
sigfifo[fifo_depth] = signo;
fifo_depth++;
fprintf (stderr,
" -> Suspender thread signal handler caught signal %d\n",
signo);
/* Get the current signal mask. */
sigprocmask (SIG_SETMASK, NULL, &set);
/* The handler should run with the current signal masked. */
suspend_set = suspender_mask;
sigaddset(&suspend_set, signo);
if (memcmp(&set, &suspend_set, sizeof(set)))
fprintf (stderr,
" >>> FAIL: sigsuspender signal handler running "
"with incorrect mask.\n");
}
else
fprintf (stderr,
" -> Main thread signal handler caught signal %d\n",
signo);
}
static void
send_thread_signal (pthread_t tid, int signo)
{
if (pthread_kill (tid, signo) != 0) {
fprintf (stderr, "Unable to send thread signal, errno %d.\n",
errno);
exit (1);
}
}
static void
send_process_signal (int signo)
{
if (kill (getpid (), signo) != 0) {
fprintf (stderr, "Unable to send process signal, errno %d.\n",
errno);
exit (1);
}
}
int main (int argc, char *argv[])
{
pthread_attr_t pattr;
void * exit_status;
struct sigaction act;
sigset_t oldset;
sigset_t newset;
/* Initialize our signal counts. */
memset ((void *) sigcounts, 0, NSIG * sizeof (int));
/* Ignore signal SIGIO. */
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SIGIO);
act.sa_handler = SIG_IGN;
act.sa_flags = 0;
sigaction (SIGIO, &act, NULL);
/* Install a signal handler for SIGURG. */
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SIGURG);
act.sa_handler = sighandler;
act.sa_flags = SA_RESTART;
sigaction (SIGURG, &act, NULL);
/* Install a signal handler for SIGXCPU */
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SIGXCPU);
sigaction (SIGXCPU, &act, NULL);
/* Get our current signal mask. */
sigprocmask (SIG_SETMASK, NULL, &oldset);
/* Mask out SIGUSR1 and SIGUSR2. */
newset = oldset;
sigaddset (&newset, SIGUSR1);
sigaddset (&newset, SIGUSR2);
sigprocmask (SIG_SETMASK, &newset, NULL);
/* Install a signal handler for SIGUSR1 */
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SIGUSR1);
sigaction (SIGUSR1, &act, NULL);
/* Install a signal handler for SIGUSR2 */
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SIGUSR2);
sigaction (SIGUSR2, &act, NULL);
/*
* Initialize the thread attribute.
*/
if ((pthread_attr_init (&pattr) != 0) ||
(pthread_attr_setdetachstate (&pattr,
PTHREAD_CREATE_JOINABLE) != 0)) {
fprintf (stderr, "Unable to initialize thread attributes.\n");
exit (1);
}
/*
* Create the sigsuspender thread.
*/
if (pthread_create (&suspender_tid, &pattr, sigsuspender, NULL) != 0) {
fprintf (stderr, "Unable to create thread, errno %d.\n", errno);
exit (1);
}
#if defined(_LIBC_R)
pthread_set_name_np (suspender_tid, "sigsuspender");
#endif
/*
* Verify that an ignored signal doesn't cause a wakeup.
* We don't have a handler installed for SIGIO.
*/
send_thread_signal (suspender_tid, SIGIO);
sleep (1);
send_process_signal (SIGIO);
sleep (1);
if (sigcounts[SIGIO] != 0)
fprintf (stderr, "FAIL: sigsuspend wakes up for ignored signal "
"SIGIO.\n");
/*
* Verify that a signal with a default action of ignore, for
* which we have a signal handler installed, will release a
* sigsuspend.
*/
send_thread_signal (suspender_tid, SIGURG);
sleep (1);
send_process_signal (SIGURG);
sleep (1);
if (sigcounts[SIGURG] != 2)
fprintf (stderr,
"FAIL: sigsuspend doesn't wake up for SIGURG.\n");
/*
* Verify that a SIGUSR2 signal will release a sigsuspended
* thread.
*/
send_thread_signal (suspender_tid, SIGUSR2);
sleep (1);
send_process_signal (SIGUSR2);
sleep (1);
if (sigcounts[SIGUSR2] != 2)
fprintf (stderr,
"FAIL: sigsuspend doesn't wake up for SIGUSR2.\n");
/*
* Verify that a signal, blocked in both the main and
* sigsuspender threads, does not cause the signal handler
* to be called.
*/
send_thread_signal (suspender_tid, SIGUSR1);
sleep (1);
send_process_signal (SIGUSR1);
sleep (1);
if (sigcounts[SIGUSR1] != 0)
fprintf (stderr, "FAIL: signal hander called for SIGUSR1.\n");
/*
* Verify that we can still kill the process for a signal
* not being waited on by sigwait.
*/
send_process_signal (SIGPIPE);
fprintf (stderr, "FAIL: SIGPIPE did not terminate process.\n");
/*
* Wait for the thread to finish.
*/
pthread_join (suspender_tid, &exit_status);
return (0);
}