| 1 | /* Test of pthread_sigmask in a multi-threaded program.
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| 2 | Copyright (C) 2011-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2011. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | #include <signal.h>
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| 22 |
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| 23 | #include <errno.h>
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| 24 | #include <pthread.h>
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| 25 | #include <stdio.h>
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| 26 | #include <unistd.h>
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| 27 |
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| 28 | #include "macros.h"
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| 29 |
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| 30 | #if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
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| 31 |
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| 32 | static pthread_t main_thread;
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| 33 | static pthread_t killer_thread;
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| 34 |
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| 35 | static void *
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| 36 | killer_thread_func (void *arg)
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| 37 | {
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| 38 | sleep (1);
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| 39 | pthread_kill (main_thread, SIGINT);
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| 40 | return NULL;
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| 41 | }
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| 42 |
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| 43 | static volatile int sigint_occurred;
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| 44 |
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| 45 | static void
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| 46 | sigint_handler (int sig)
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| 47 | {
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| 48 | sigint_occurred++;
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| 49 | }
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| 50 |
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| 51 | int
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| 52 | main (int argc, char *argv[])
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| 53 | {
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| 54 | sigset_t set;
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| 55 |
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| 56 | signal (SIGINT, sigint_handler);
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| 57 |
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| 58 | sigemptyset (&set);
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| 59 | sigaddset (&set, SIGINT);
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| 60 |
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| 61 | /* Check error handling. */
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| 62 | /* This call returns 0 on NetBSD 8.0. */
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| 63 | #if !defined __NetBSD__
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| 64 | ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
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| 65 | #endif
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| 66 |
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| 67 | /* Block SIGINT. */
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| 68 | ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
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| 69 |
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| 70 | /* Request a SIGINT signal from another thread. */
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| 71 | main_thread = pthread_self ();
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| 72 | ASSERT (pthread_create (&killer_thread, NULL, killer_thread_func, NULL) == 0);
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| 73 |
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| 74 | /* Wait. */
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| 75 | sleep (2);
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| 76 |
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| 77 | /* The signal should not have arrived yet, because it is blocked. */
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| 78 | ASSERT (sigint_occurred == 0);
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| 79 |
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| 80 | /* Unblock SIGINT. */
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| 81 | ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
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| 82 |
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| 83 | /* The signal should have arrived now, because POSIX says
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| 84 | "If there are any pending unblocked signals after the call to
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| 85 | pthread_sigmask(), at least one of those signals shall be delivered
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| 86 | before the call to pthread_sigmask() returns." */
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| 87 | ASSERT (sigint_occurred == 1);
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| 88 |
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| 89 | /* Clean up the thread. This avoid a "ThreadSanitizer: thread leak" warning
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| 90 | from "gcc -fsanitize=thread". */
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| 91 | ASSERT (pthread_join (killer_thread, NULL) == 0);
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| 92 |
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| 93 | return 0;
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| 94 | }
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| 95 |
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| 96 | #else
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| 97 |
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| 98 | int
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| 99 | main ()
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| 100 | {
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| 101 | fputs ("Skipping test: POSIX threads not enabled\n", stderr);
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| 102 | return 77;
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| 103 | }
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| 104 |
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| 105 | #endif
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