1  /* Test of sigprocmask.
       2     Copyright (C) 2011-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2011.  */
      18  
      19  #include <config.h>
      20  
      21  #include <signal.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (sigprocmask, int, (int, const sigset_t *, sigset_t *));
      25  
      26  #include <errno.h>
      27  #include <limits.h>
      28  #include <stdio.h>
      29  #include <stdlib.h>
      30  #include <unistd.h>
      31  
      32  #include "macros.h"
      33  
      34  #if !(defined _WIN32 && !defined __CYGWIN__)
      35  
      36  static volatile int sigint_occurred;
      37  
      38  static void
      39  sigint_handler (_GL_UNUSED int sig)
      40  {
      41    sigint_occurred++;
      42  }
      43  
      44  int
      45  main ()
      46  {
      47    sigset_t set;
      48    pid_t pid = getpid ();
      49    char command[80];
      50  
      51    if (LONG_MAX < pid)
      52      {
      53        fputs ("Skipping test: pid too large\n", stderr);
      54        return 77;
      55      }
      56  
      57    signal (SIGINT, sigint_handler);
      58  
      59    sigemptyset (&set);
      60    sigaddset (&set, SIGINT);
      61  
      62    /* Check error handling.  */
      63    ASSERT (sigprocmask (1729, &set, NULL) == -1);
      64    ASSERT (errno == EINVAL);
      65  
      66    /* Block SIGINT.  */
      67    ASSERT (sigprocmask (SIG_BLOCK, &set, NULL) == 0);
      68  
      69    /* Request a SIGINT signal from outside.  */
      70    sprintf (command, "sh -c 'sleep 1; kill -INT %ld' &", (long) pid);
      71    ASSERT (system (command) == 0);
      72  
      73    /* Wait.  */
      74    sleep (2);
      75  
      76    /* The signal should not have arrived yet, because it is blocked.  */
      77    ASSERT (sigint_occurred == 0);
      78  
      79    /* Unblock SIGINT.  */
      80    ASSERT (sigprocmask (SIG_UNBLOCK, &set, NULL) == 0);
      81  
      82    /* The signal should have arrived now, because POSIX says
      83         "If there are any pending unblocked signals after the call to
      84          sigprocmask(), at least one of those signals shall be delivered
      85          before the call to sigprocmask() returns."  */
      86    ASSERT (sigint_occurred == 1);
      87  
      88    return 0;
      89  }
      90  
      91  #else
      92  
      93  /* On native Windows, getpid() values and the arguments that are passed to
      94     the (Cygwin?) 'kill' program are not necessarily related.  */
      95  
      96  int
      97  main ()
      98  {
      99    fputs ("Skipping test: native Windows platform\n", stderr);
     100    return 77;
     101  }
     102  
     103  #endif