/* * Copyright (c) 1998 Daniel M. Eischen * 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 1.1.2.1 2000/07/17 22:18:32 jasone Exp $ */ #include #include #include #include #include #include #include #include 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 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) { 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); } pthread_set_name_np (suspender_tid, "sigsuspender"); /* * 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); }