io/poll.c

   1 /* Poll (or wait) for file descriptor I/O availability.  Stub version.
   2    Copyright (C) 1994-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/poll.h>
  20 #include <errno.h>
  21
  22 /* Poll the file descriptors described by the NFDS structures starting at
  23    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  24    an event to occur; if TIMEOUT is -1, block until an event occurs.
  25    Returns the number of file descriptors with events, zero if timed out,
  26    or -1 for errors.  */
  27
  28 int
  29 __poll (struct pollfd *fds, nfds_t nfds, int timeout)
  30 {
  31   __set_errno (ENOSYS);
  32   return -1;
  33 }
  34 libc_hidden_def (__poll)
  35 weak_alias (__poll, poll)
  36
  37 stub_warning (poll)