/*-

 * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * $FreeBSD: src/sys/sys/poll.h,v 1.13 2002/07/10 04:47:25 mike Exp $

 */

#ifndef _SYS_POLL_H_

#define	_SYS_POLL_H_

#include <sys/cdefs.h>

/*

 * This file is intended to be compatible with the traditional poll.h.

 */

typedef	unsigned int	nfds_t;

/*

 * This structure is passed as an array to poll(2).

 */

struct pollfd {

	int	fd;		/* which file descriptor to poll */

	short	events;		/* events we are interested in */

	short	revents;	/* events found on return */

};

/*

 * Requestable events.  If poll(2) finds any of these set, they are

 * copied to revents on return.

 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI

 * and POLLRDBAND since none of the file types have distinct priority

 * bands - and only some have an urgent "mode".

 * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV

 * POLLIN includes all of normal, band and urgent data.  Most poll handlers

 * on FreeBSD only treat it as "normal" data.

 */

#define	POLLIN		0x0001		/* any readable data available */

#define	POLLPRI		0x0002		/* OOB/Urgent readable data */

#define	POLLOUT		0x0004		/* file descriptor is writeable */

#define	POLLRDNORM	0x0040		/* non-OOB/URG data available */

#define	POLLWRNORM	POLLOUT		/* no write type differentiation */

#define	POLLRDBAND	0x0080		/* OOB/Urgent readable data */

#define	POLLWRBAND	0x0100		/* OOB/Urgent data can be written */

#if __BSD_VISIBLE

/* General FreeBSD extension (currently only supported for sockets): */

#define	POLLINIGNEOF	0x2000		/* like POLLIN, except ignore EOF */

#endif

/*

 * These events are set if they occur regardless of whether they were

 * requested.

 */

#define	POLLERR		0x0008		/* some poll error occurred */

#define	POLLHUP		0x0010		/* file descriptor was "hung up" */

#define	POLLNVAL	0x0020		/* requested events "invalid" */

#if __BSD_VISIBLE

#define	POLLSTANDARD	(POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\

			 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)

/*

 * Request that poll() wait forever.

 * XXX in SYSV, this is defined in stropts.h, which is not included

 * by poll.h.

 */

#define	INFTIM		(-1)

#endif

#endif /* !_SYS_POLL_H_ */