mpd/src/ioops.h

/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef IOOPS_H
#define IOOPS_H

#include "../config.h"
#include "os_compat.h"

#ifdef HAVE_ZEROCONF
struct ioOps {
	struct ioOps *prev, *next;

	/*
	 * Called before each 'select' statement.
	 *   To register for IO, call FD_SET for each required queue
	 * Return the highest fd number you registered
	 */
	int (*fdset) (fd_set * rfds, fd_set * wfds, fd_set * efds);

	/*
	 * Called after each 'select' statement.
	 *   fdCount is the number of fds total in all sets.  It may be 0.
	 *   For each fd you registered for in (fdset), you should FD_CLR it from the
	 *   appropriate queue(s).
	 * Return the total number of fds left in all sets (Ie, return fdCount
	 *   minus the number of times you called FD_CLR).
	 */
	int (*consume) (int fdCount, fd_set * rfds, fd_set * wfds,
			fd_set * efds);
};

/* Call this to register your io operation handler struct */
void registerIO(struct ioOps *ops);

/* Call this to deregister your io operation handler struct */
void deregisterIO(struct ioOps *ops);

/* Add fds for all registered IO handlers */
void registered_IO_add_fds(int *fdmax,
                           fd_set * rfds, fd_set * wfds, fd_set * efds);

/* Consume fds for all registered IO handlers */
void registered_IO_consume_fds(int *selret,
			       fd_set * rfds, fd_set * wfds, fd_set * efds);
#else /* ! HAVE_ZEROCONF */

#define registered_IO_add_fds(fdmax,rfds,wfds,efds)
#define registered_IO_consume_fds(selret,rfds,wfds,efds)

#endif /* HAVE_ZEROCONF */

#endif