1 /* Test of pthread_sigmask in a multi-threaded program.
2 Copyright (C) 2011-2020 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2011. */
18
19 #include <config.h>
20
21 #include <signal.h>
22
23 #include <errno.h>
24 #include <pthread.h>
25 #include <stdio.h>
26 #include <unistd.h>
27
28 #include "macros.h"
29
30 #if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
31
32 static pthread_t main_thread;
33 static pthread_t killer_thread;
34
35 static void *
killer_thread_func(void * arg)36 killer_thread_func (void *arg)
37 {
38 sleep (1);
39 pthread_kill (main_thread, SIGINT);
40 return NULL;
41 }
42
43 static volatile int sigint_occurred;
44
45 static void
sigint_handler(int sig)46 sigint_handler (int sig)
47 {
48 sigint_occurred++;
49 }
50
51 int
main(int argc,char * argv[])52 main (int argc, char *argv[])
53 {
54 sigset_t set;
55
56 signal (SIGINT, sigint_handler);
57
58 sigemptyset (&set);
59 sigaddset (&set, SIGINT);
60
61 /* Check error handling. */
62 /* This call returns 0 on NetBSD 8.0. */
63 #if !defined __NetBSD__
64 ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
65 #endif
66
67 /* Block SIGINT. */
68 ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
69
70 /* Request a SIGINT signal from another thread. */
71 main_thread = pthread_self ();
72 ASSERT (pthread_create (&killer_thread, NULL, killer_thread_func, NULL) == 0);
73
74 /* Wait. */
75 sleep (2);
76
77 /* The signal should not have arrived yet, because it is blocked. */
78 ASSERT (sigint_occurred == 0);
79
80 /* Unblock SIGINT. */
81 ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
82
83 /* The signal should have arrived now, because POSIX says
84 "If there are any pending unblocked signals after the call to
85 pthread_sigmask(), at least one of those signals shall be delivered
86 before the call to pthread_sigmask() returns." */
87 ASSERT (sigint_occurred == 1);
88
89 /* Clean up the thread. This avoid a "ThreadSanitizer: thread leak" warning
90 from "gcc -fsanitize=thread". */
91 ASSERT (pthread_join (killer_thread, NULL) == 0);
92
93 return 0;
94 }
95
96 #else
97
98 int
main()99 main ()
100 {
101 fputs ("Skipping test: POSIX threads not enabled\n", stderr);
102 return 77;
103 }
104
105 #endif
106