Blame gnulib-tests/test-sigprocmask.c

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/* Test of sigprocmask.
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   Copyright (C) 2011-2017 Free Software Foundation, Inc.
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   This program is free software: you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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/* Written by Bruno Haible <bruno@clisp.org>, 2011.  */
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#include <config.h>
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#include <signal.h>
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#include "signature.h"
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SIGNATURE_CHECK (sigprocmask, int, (int, const sigset_t *, sigset_t *));
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "macros.h"
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#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
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static volatile int sigint_occurred;
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static void
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sigint_handler (int sig)
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{
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  sigint_occurred++;
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}
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int
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main (int argc, char *argv[])
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{
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  sigset_t set;
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  pid_t pid = getpid ();
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  char command[80];
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  if (sizeof (int) < sizeof pid && 0x7fffffff < pid)
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    {
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      fputs ("Skipping test: pid too large\n", stderr);
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      return 77;
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    }
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  signal (SIGINT, sigint_handler);
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  sigemptyset (&set);
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  sigaddset (&set, SIGINT);
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  /* Check error handling.  */
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  ASSERT (sigprocmask (1729, &set, NULL) == -1);
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  ASSERT (errno == EINVAL);
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  /* Block SIGINT.  */
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  ASSERT (sigprocmask (SIG_BLOCK, &set, NULL) == 0);
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  /* Request a SIGINT signal from outside.  */
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  sprintf (command, "sh -c 'sleep 1; kill -%d %d' &", SIGINT, (int) pid);
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  ASSERT (system (command) == 0);
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  /* Wait.  */
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  sleep (2);
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  /* The signal should not have arrived yet, because it is blocked.  */
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  ASSERT (sigint_occurred == 0);
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  /* Unblock SIGINT.  */
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  ASSERT (sigprocmask (SIG_UNBLOCK, &set, NULL) == 0);
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  /* The signal should have arrived now, because POSIX says
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       "If there are any pending unblocked signals after the call to
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        sigprocmask(), at least one of those signals shall be delivered
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        before the call to sigprocmask() returns."  */
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  ASSERT (sigint_occurred == 1);
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  return 0;
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}
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#else
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/* On native Windows, getpid() values and the arguments that are passed to
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   the (Cygwin?) 'kill' program are not necessarily related.  */
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int
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main ()
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{
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  fputs ("Skipping test: native Windows platform\n", stderr);
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  return 77;
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}
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#endif