1  /*
       2   * Check that signal injection works properly.
       3   *
       4   * Copyright (c) 2017-2018 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2017-2021 The strace developers.
       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 <unistd.h>
      14  #include "scno.h"
      15  
      16  static void
      17  handler(int sig)
      18  {
      19  	syscall(__NR_exit_group, 0);
      20  }
      21  
      22  int
      23  main(void)
      24  {
      25  	const struct sigaction act = { .sa_handler = handler };
      26  	if (sigaction(SIGUSR1, &act, NULL))
      27  		perror_msg_and_fail("sigaction");
      28  
      29  	sigset_t mask;
      30  	sigemptyset(&mask);
      31  	sigaddset(&mask, SIGUSR1);
      32  	if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
      33  		perror_msg_and_fail("sigprocmask");
      34  
      35  	syscall(__NR_chdir, ".");
      36  	syscall(__NR_exit_group, 1);
      37  	return 1;
      38  }