| 1 | /* |
| 2 | * Test that sigreturn() does not corrupt the signal mask. |
| 3 | * Block SIGUSR2 and handle SIGUSR1. |
| 4 | * Then sigwait() SIGUSR2, which relies on it remaining blocked. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | #include <assert.h> |
| 9 | #include <pthread.h> |
| 10 | #include <signal.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <unistd.h> |
| 13 | |
| 14 | int seen_sig = -1; |
| 15 | |
| 16 | static void signal_func(int sig) |
| 17 | { |
| 18 | seen_sig = sig; |
| 19 | } |
| 20 | |
| 21 | static void *thread_func(void *arg) |
| 22 | { |
| 23 | kill(getpid(), SIGUSR2); |
| 24 | return NULL; |
| 25 | } |
| 26 | |
| 27 | int main(void) |
| 28 | { |
| 29 | struct sigaction act = { |
| 30 | .sa_handler = signal_func, |
| 31 | }; |
| 32 | pthread_t thread; |
| 33 | sigset_t set; |
| 34 | int sig; |
| 35 | |
| 36 | assert(sigaction(SIGUSR1, &act, NULL) == 0); |
| 37 | |
| 38 | assert(sigemptyset(&set) == 0); |
| 39 | assert(sigaddset(&set, SIGUSR2) == 0); |
| 40 | assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0); |
| 41 | |
| 42 | kill(getpid(), SIGUSR1); |
| 43 | assert(seen_sig == SIGUSR1); |
| 44 | |
| 45 | assert(pthread_create(&thread, NULL, thread_func, NULL) == 0); |
| 46 | assert(sigwait(&set, &sig) == 0); |
| 47 | assert(sig == SIGUSR2); |
| 48 | assert(pthread_join(thread, NULL) == 0); |
| 49 | |
| 50 | return EXIT_SUCCESS; |
| 51 | } |