/*	$NetBSD: poll.h,v 1.2 1996/09/07 21:44:59 mycroft Exp $	*/

/*
 * Copyright (c) 1996 Charles M. Hannum.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Charles M. Hannum.
 * 4. 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 ``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 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.
 */

#ifndef _SYS_POLL_H_
#define	_SYS_POLL_H_

struct pollfd {
	int	fd;		/* file descriptor */
	short	events;		/* events to look for */
	short	revents;	/* events returned */
};

/*
 * Testable events (may be specified in events field).
 */
#define	POLLIN		0x0001
#define	POLLPRI		0x0002
#define	POLLOUT		0x0004
#define	POLLRDNORM	0x0040
#define	POLLWRNORM	POLLOUT
#define	POLLRDBAND	0x0080
#define	POLLWRBAND	0x0100

/*
 * Non-testable events (may not be specified in events field).
 */
#define	POLLERR		0x0008
#define	POLLHUP		0x0010
#define	POLLNVAL	0x0020

/*
 * Infinite timeout value.
 */
#define	INFTIM		-1

#ifndef _KERNEL

#include <sys/cdefs.h>

__BEGIN_DECLS
int	poll __P((struct pollfd *, u_int, int));
__END_DECLS

#endif /* _KERNEL */

#endif /* !_SYS_POLL_H_ */