1  /* poll file descriptors.  Hurd version.
       2     Copyright (C) 1998-2023 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 <sys/time.h>
      21  #include <hurd.h>
      22  #include <hurd/fd.h>
      23  
      24  /* Poll the file descriptors described by the NFDS structures starting at
      25     FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
      26     an event to occur; if TIMEOUT is -1, block until an event occurs.
      27     Returns the number of file descriptors with events, zero if timed out,
      28     or -1 for errors.  */
      29  
      30  int
      31  __poll (struct pollfd *fds, nfds_t nfds, int timeout)
      32  {
      33    struct timespec ts, *to;
      34  
      35    if (timeout < 0)
      36      to = NULL;
      37    else
      38      {
      39        ts.tv_sec = timeout / 1000;
      40        ts.tv_nsec = (timeout % 1000) * 1000000;
      41        to = &ts;
      42      }
      43  
      44    return _hurd_select (nfds, fds, NULL, NULL, NULL, to, NULL);
      45  }
      46  libc_hidden_def (__poll)
      47  weak_alias (__poll, poll)