/* Check that sigwait does not fail with EINTR (bug 22478).

   Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <signal.h>

#include <stdio.h>

#include <support/check.h>

#include <support/xunistd.h>

#include <time.h>

#include <unistd.h>

/* Handler for SIGUSR1.  */

static void

sigusr1_handler (int signo)

{

  TEST_VERIFY (signo == SIGUSR1);

}

/* Spawn a subprocess to send two signals: First SIGUSR1, then

   SIGUSR2.  Return the PID of the process.  */

static pid_t

signal_sender (void)

{

  pid_t pid = xfork ();

  if (pid == 0)

    {

      static const struct timespec delay = { 1, };

      if (nanosleep (&delay, NULL) != 0)

        FAIL_EXIT1 ("nanosleep: %m");

      if (kill (getppid (), SIGUSR1) != 0)

        FAIL_EXIT1 ("kill (SIGUSR1): %m");

      if (nanosleep (&delay, NULL) != 0)

        FAIL_EXIT1 ("nanosleep: %m");

      if (kill (getppid (), SIGUSR2) != 0)

        FAIL_EXIT1 ("kill (SIGUSR2): %m");

      _exit (0);

    }

  return pid;

}

static int

do_test (void)

{

  if (signal (SIGUSR1, sigusr1_handler) == SIG_ERR)

    FAIL_EXIT1 ("signal (SIGUSR1): %m\n");

  sigset_t sigs;

  sigemptyset (&sigs;;

  sigaddset (&sigs, SIGUSR2);

  if (sigprocmask (SIG_BLOCK, &sigs, NULL) != 0)

    FAIL_EXIT1 ("sigprocmask (SIGBLOCK, SIGUSR2): %m");

  pid_t pid = signal_sender ();

  int signo = 0;

  int ret = sigwait (&sigs, &signo);

  if (ret != 0)

    {

      support_record_failure ();

      errno = ret;

      printf ("error: sigwait failed: %m (%d)\n", ret);

    }

  TEST_VERIFY (signo == SIGUSR2);

  int status;

  xwaitpid (pid, &status, 0);

  TEST_VERIFY (status == 0);

  return 0;

}

#include <support/test-driver.c>