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