tests/test-sigprocmask.c

   1 /* Test of sigprocmask.
   2    Copyright (C) 2011-2020 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 <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30
  31 #include "macros.h"
  32
  33 #if !(defined _WIN32 && !defined __CYGWIN__)
  34
  35 static volatile int sigint_occurred;
  36
  37 static void
  38 sigint_handler (int sig)
  39 {
  40   sigint_occurred++;
  41 }
  42
  43 int
  44 main (int argc, char *argv[])
  45 {
  46   sigset_t set;
  47   pid_t pid = getpid ();
  48   char command[80];
  49
  50   if (sizeof (int) < sizeof pid && 0x7fffffff < pid)
  51     {
  52       fputs ("Skipping test: pid too large\n", stderr);
  53       return 77;
  54     }
  55
  56   signal (SIGINT, sigint_handler);
  57
  58   sigemptyset (&set);
  59   sigaddset (&set, SIGINT);
  60
  61   /* Check error handling.  */
  62   ASSERT (sigprocmask (1729, &set, NULL) == -1);
  63   ASSERT (errno == EINVAL);
  64
  65   /* Block SIGINT.  */
  66   ASSERT (sigprocmask (SIG_BLOCK, &set, NULL) == 0);
  67
  68   /* Request a SIGINT signal from outside.  */
  69   sprintf (command, "sh -c 'sleep 1; kill -%d %d' &", SIGINT, (int) pid);
  70   ASSERT (system (command) == 0);
  71
  72   /* Wait.  */
  73   sleep (2);
  74
  75   /* The signal should not have arrived yet, because it is blocked.  */
  76   ASSERT (sigint_occurred == 0);
  77
  78   /* Unblock SIGINT.  */
  79   ASSERT (sigprocmask (SIG_UNBLOCK, &set, NULL) == 0);
  80
  81   /* The signal should have arrived now, because POSIX says
  82        "If there are any pending unblocked signals after the call to
  83         sigprocmask(), at least one of those signals shall be delivered
  84         before the call to sigprocmask() returns."  */
  85   ASSERT (sigint_occurred == 1);
  86
  87   return 0;
  88 }
  89
  90 #else
  91
  92 /* On native Windows, getpid() values and the arguments that are passed to
  93    the (Cygwin?) 'kill' program are not necessarily related.  */
  94
  95 int
  96 main ()
  97 {
  98   fputs ("Skipping test: native Windows platform\n", stderr);
  99   return 77;
 100 }
 101
 102 #endif