/* Copyright (C) 2006-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.

   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 <limits.h>

#include <signal.h>

#include <stddef.h>	/* For NULL.  */

#include <sys/poll.h>

#include <sysdep-cancel.h>

int

ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,

       const sigset_t *sigmask)

{

  int tval = -1;

  /* poll uses a simple millisecond value.  Convert it.  */

  if (timeout != NULL)

    {

      if (timeout->tv_sec < 0

	  || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000)

	{

	  __set_errno (EINVAL);

	  return -1;

	}

      if (timeout->tv_sec > INT_MAX / 1000

	  || (timeout->tv_sec == INT_MAX / 1000

	      && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000)))

	/* We cannot represent the timeout in an int value.  Wait

	   forever.  */

	tval = -1;

      else

	tval = (timeout->tv_sec * 1000

		+ (timeout->tv_nsec + 999999) / 1000000);

    }

  /* The setting and restoring of the signal mask and the select call

     should be an atomic operation.  This can't be done without kernel

     help.  */

  sigset_t savemask;

  if (sigmask != NULL)

    __sigprocmask (SIG_SETMASK, sigmask, &savemask);

  /* Note the ppoll() is a cancellation point.  But since we call

     poll() which itself is a cancellation point we do not have

     to do anything here.  */

  int retval = __poll (fds, nfds, tval);

  if (sigmask != NULL)

    __sigprocmask (SIG_SETMASK, &savemask, NULL);

  return retval;

}

#ifndef ppoll

/* __poll handles cancellation.  */

LIBC_CANCEL_HANDLED ();

libc_hidden_def (ppoll);

#endif