io/poll.c

   1 /* Copyright (C) 1994, 1995, 1996, 1997, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/poll.h>
  19 #include <errno.h>
  20
  21 /* Poll the file descriptors described by the NFDS structures starting at
  22    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  23    an event to occur; if TIMEOUT is -1, block until an event occurs.
  24    Returns the number of file descriptors with events, zero if timed out,
  25    or -1 for errors.  */
  26
  27 int
  28 poll (fds, nfds, timeout)
  29      struct pollfd *fds;
  30      nfds_t nfds;
  31      int timeout;
  32 {
  33   __set_errno (ENOSYS);
  34   return -1;
  35 }
  36
  37 stub_warning (poll)