/* Test of sleep() function.

   Copyright (C) 2007-2020 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program 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 General Public License for more details.

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

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */

#include <config.h>

#include <unistd.h>

#include "signature.h"

SIGNATURE_CHECK (sleep, unsigned int, (unsigned int));

#include <signal.h>

#include "macros.h"

#if HAVE_DECL_ALARM

static void

handle_alarm (int sig)

{

  if (sig != SIGALRM)

    _exit (1);

}

#endif

int

main (void)

{

  ASSERT (sleep (1) <= 1);

  ASSERT (sleep (0) == 0);

#if HAVE_DECL_ALARM

  {

    const unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days.  */

    unsigned int remaining;

    signal (SIGALRM, handle_alarm);

    alarm (1);

    remaining = sleep (pentecost);

    ASSERT (pentecost - 10 < remaining && remaining <= pentecost);

  }

#endif

  return 0;

}