sysdeps/mach/hurd/poll.c

   1 /* poll file descriptors.  Hurd version.
   2    Copyright (C) 1998, 2001, 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sys/poll.h>
  21 #include <sys/time.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24
  25 /* Poll the file descriptors described by the NFDS structures starting at
  26    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  27    an event to occur; if TIMEOUT is -1, block until an event occurs.
  28    Returns the number of file descriptors with events, zero if timed out,
  29    or -1 for errors.  */
  30
  31 int
  32 __poll (fds, nfds, timeout)
  33      struct pollfd *fds;
  34      nfds_t nfds;
  35      int timeout;
  36 {
  37   struct timespec ts, *to;
  38
  39   if (timeout < 0)
  40     to = NULL;
  41   else
  42     {
  43       ts.tv_sec = timeout / 1000;
  44       ts.tv_nsec = (timeout % 1000) * 1000000;
  45       to = &ts;
  46     }
  47
  48   return _hurd_select (nfds, fds, NULL, NULL, NULL, to, NULL);
  49 }
  50 libc_hidden_def (__poll)
  51 weak_alias (__poll, poll)