1  /*
       2   * Check that the specified signal number is blocked/unblocked.
       3   *
       4   * Copyright (c) 2017-2021 Dmitry V. Levin <ldv@strace.io>
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  #include <signal.h>
      12  #include <stdlib.h>
      13  
      14  int
      15  main(int ac, char **av)
      16  {
      17  	if (ac != 3)
      18  		error_msg_and_fail("usage: check_sigblock 0|1 signum");
      19  
      20  	const int block = !!atoi(av[1]);
      21  	const int signum = atoi(av[2]);
      22  	sigset_t mask;
      23  
      24  	sigemptyset(&mask);
      25  	if (sigprocmask(SIG_SETMASK, NULL, &mask))
      26  		perror_msg_and_fail("sigprocmask");
      27  
      28  	return block ^ sigismember(&mask, signum);
      29  }