glibc/sysdeps/mach/hurd/poll.c

/* poll file descriptors.  Hurd version.
   Copyright (C) 1998-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <sys/poll.h>
#include <sys/time.h>
#include <hurd.h>
#include <hurd/fd.h>

/* Poll the file descriptors described by the NFDS structures starting at
   FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
   an event to occur; if TIMEOUT is -1, block until an event occurs.
   Returns the number of file descriptors with events, zero if timed out,
   or -1 for errors.  */

int
__poll (struct pollfd *fds, nfds_t nfds, int timeout)
{
  struct timespec ts, *to;

  if (timeout < 0)
    to = NULL;
  else
    {
      ts.tv_sec = timeout / 1000;
      ts.tv_nsec = (timeout % 1000) * 1000000;
      to = &ts;
    }

  return _hurd_select (nfds, fds, NULL, NULL, NULL, to, NULL);
}
libc_hidden_def (__poll)
weak_alias (__poll, poll)