/* 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 <signal.h>

#include <time.h>

#include <sys/poll.h>

#include <kernel-features.h>

#include <sysdep-cancel.h>

#ifdef __NR_pselect6

# ifndef __ASSUME_PSELECT

static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds,

			      fd_set *exceptfds,

			      const struct timespec *timeout,

			      const sigset_t *sigmask);

# endif

int

__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,

	   const struct timespec *timeout, const sigset_t *sigmask)

{

  /* The Linux kernel can in some situations update the timeout value.

     We do not want that so use a local variable.  */

  struct timespec tval;

  if (timeout != NULL)

    {

      tval = *timeout;

      timeout = &tval;

    }

  /* Note: the system call expects 7 values but on most architectures

     we can only pass in 6 directly.  If there is an architecture with

     support for more parameters a new version of this file needs to

     be created.  */

  struct

  {

    __syscall_ulong_t ss;

    __syscall_ulong_t ss_len;

  } data;

  data.ss = (__syscall_ulong_t) (uintptr_t) sigmask;

  data.ss_len = _NSIG / 8;

  int result;

#ifndef CALL_PSELECT6

# define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \

  SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds,	timeout, data)

#endif

  result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout,

			  &data);

# ifndef __ASSUME_PSELECT

  if (result == -1 && errno == ENOSYS)

    result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout,

				sigmask);

# endif

  return result;

}

weak_alias (__pselect, pselect)

# ifndef __ASSUME_PSELECT

#  define __pselect static __generic_pselect

# endif

#endif

#ifndef __ASSUME_PSELECT

# include <misc/pselect.c>

#endif