1  /*
       2   * Check decoding of pause syscall.
       3   *
       4   * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2016 Fei Jie <feij.fnst@cn.fujitsu.com>
       6   * Copyright (c) 2016-2021 The strace developers.
       7   * All rights reserved.
       8   *
       9   * SPDX-License-Identifier: GPL-2.0-or-later
      10   */
      11  
      12  #include "tests.h"
      13  #include "scno.h"
      14  
      15  #ifdef __NR_pause
      16  
      17  # include <errno.h>
      18  # include <signal.h>
      19  # include <stdio.h>
      20  # include <sys/time.h>
      21  # include <unistd.h>
      22  
      23  static void
      24  handler(int sig)
      25  {
      26  }
      27  
      28  int
      29  main(void)
      30  {
      31  	const struct sigaction act = { .sa_handler = handler };
      32  	if (sigaction(SIGALRM, &act, NULL))
      33  		perror_msg_and_fail("sigaction");
      34  
      35  	sigset_t mask;
      36  	sigemptyset(&mask);
      37  	sigaddset(&mask, SIGALRM);
      38  	if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
      39  		perror_msg_and_fail("sigprocmask");
      40  
      41  	const struct itimerval itv = { .it_value.tv_usec = 123456 };
      42  	if (setitimer(ITIMER_REAL, &itv, NULL))
      43  		perror_msg_and_fail("setitimer");
      44  
      45  	syscall(__NR_pause);
      46  	if (errno == ENOSYS)
      47  		printf("pause() = -1 ENOSYS (%m)\n");
      48  	else
      49  		printf("pause() = ? ERESTARTNOHAND"
      50  		       " (To be restarted if no handler)\n");
      51  
      52  	puts("+++ exited with 0 +++");
      53  	return 0;
      54  }
      55  
      56  #else
      57  
      58  SKIP_MAIN_UNDEFINED("__NR_pause")
      59  
      60  #endif