code.delx.au - pulseaudio/blob - src/pulsecore/poll.h

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 /***
  23    Based on work for the GNU C Library.
  24    Copyright (C) 1994,96,97,98,99,2000,2001,2004 Free Software Foundation, Inc.
  25 ***/
  26
  27 #if defined(HAVE_POLL_H)
  28 #include <poll.h>
  29 #else
  30
  31 /* Event types that can be polled for.  These bits may be set in `events'
  32    to indicate the interesting event types; they will appear in `revents'
  33    to indicate the status of the file descriptor.  */
  34 #define POLLIN          0x001           /* There is data to read.  */
  35 #define POLLPRI         0x002           /* There is urgent data to read.  */
  36 #define POLLOUT         0x004           /* Writing now will not block.  */
  37
  38 /* Event types always implicitly polled for.  These bits need not be set in
  39    `events', but they will appear in `revents' to indicate the status of
  40    the file descriptor.  */
  41 #define POLLERR         0x008           /* Error condition.  */
  42 #define POLLHUP         0x010           /* Hung up.  */
  43 #define POLLNVAL        0x020           /* Invalid polling request.  */
  44
  45 /* Data structure describing a polling request.  */
  46 struct pollfd
  47   {
  48     int fd;                     /* File descriptor to poll.  */
  49     short int events;           /* Types of events poller cares about.  */
  50     short int revents;          /* Types of events that actually occurred.  */
  51   };
  52
  53
  54 /* Poll the file descriptors described by the NFDS structures starting at
  55    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
  56    an event to occur; if TIMEOUT is -1, block until an event occurs.
  57    Returns the number of file descriptors with events, zero if timed out,
  58    or -1 for errors.  */
  59
  60 #endif /* HAVE_POLL_H */
  61
  62 #if defined(HAVE_POLL_H) && !defined(OS_IS_DARWIN)
  63 #define pa_poll(fds,nfds,timeout) poll((fds),(nfds),(timeout))
  64 #else
  65 int pa_poll (struct pollfd *fds, unsigned long nfds, int timeout);
  66 #endif