sysdeps/mach/hurd/poll.c

   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)