1  /*
       2   * Check decoding of ERESTARTSYS error code.
       3   *
       4   * Copyright (c) 2016-2021 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  
      12  #include <signal.h>
      13  #include <stdio.h>
      14  #include <sys/time.h>
      15  #include <sys/socket.h>
      16  #include <unistd.h>
      17  
      18  static int sv[2];
      19  
      20  static void
      21  handler(int sig)
      22  {
      23  	close(sv[1]);
      24  	sv[1] = -1;
      25  }
      26  
      27  int
      28  main(void)
      29  {
      30  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
      31  		perror_msg_and_skip("socketpair");
      32  
      33  	const struct sigaction act = {
      34  		.sa_handler = handler,
      35  		.sa_flags = SA_RESTART
      36  	};
      37  	if (sigaction(SIGALRM, &act, NULL))
      38  		perror_msg_and_fail("sigaction");
      39  
      40  	sigset_t mask;
      41  	sigemptyset(&mask);
      42  	sigaddset(&mask, SIGALRM);
      43  	if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
      44  		perror_msg_and_fail("sigprocmask");
      45  
      46  	const struct itimerval itv = { .it_value.tv_usec = 123456 };
      47  	if (setitimer(ITIMER_REAL, &itv, NULL))
      48  		perror_msg_and_fail("setitimer");
      49  
      50  	if (recvfrom(sv[0], &sv[1], sizeof(sv[1]), 0, NULL, NULL))
      51  		perror_msg_and_fail("recvfrom");
      52  
      53  	printf("recvfrom(%d, %p, %d, 0, NULL, NULL) = ? ERESTARTSYS"
      54  	       " (To be restarted if SA_RESTART is set)\n",
      55  	       sv[0], &sv[1], (int) sizeof(sv[1]));
      56  	printf("recvfrom(%d, \"\", %d, 0, NULL, NULL) = 0\n",
      57  	       sv[0], (int) sizeof(sv[1]));
      58  
      59  	puts("+++ exited with 0 +++");
      60  	return 0;
      61  }