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/* Test of pthread_sigmask in a multi-threaded program.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2011. */
#include <config.h>
#include <signal.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include "macros.h"
#if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
static pthread_t main_thread;
static pthread_t killer_thread;
static void *
killer_thread_func (void *arg)
{
sleep (1);
pthread_kill (main_thread, SIGINT);
return NULL;
}
static volatile int sigint_occurred;
static void
sigint_handler (int sig)
{
sigint_occurred++;
}
int
main (int argc, char *argv[])
{
sigset_t set;
signal (SIGINT, sigint_handler);
sigemptyset (&set);
sigaddset (&set, SIGINT);
/* Check error handling. */
/* This call returns 0 on NetBSD 8.0. */
#if !defined __NetBSD__
ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
#endif
/* Block SIGINT. */
ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
/* Request a SIGINT signal from another thread. */
main_thread = pthread_self ();
ASSERT (pthread_create (&killer_thread, NULL, killer_thread_func, NULL) == 0);
/* Wait. */
sleep (2);
/* The signal should not have arrived yet, because it is blocked. */
ASSERT (sigint_occurred == 0);
/* Unblock SIGINT. */
ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
/* The signal should have arrived now, because POSIX says
"If there are any pending unblocked signals after the call to
pthread_sigmask(), at least one of those signals shall be delivered
before the call to pthread_sigmask() returns." */
ASSERT (sigint_occurred == 1);
/* Clean up the thread. This avoid a "ThreadSanitizer: thread leak" warning
from "gcc -fsanitize=thread". */
ASSERT (pthread_join (killer_thread, NULL) == 0);
return 0;
}
#else
int
main ()
{
fputs ("Skipping test: POSIX threads not enabled\n", stderr);
return 77;
}
#endif
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