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)