/*-

 * Copyright (c) 1992, 1993

 *	The Regents of the University of California.  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.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/select.h,v 1.19 2004/04/07 04:19:49 imp Exp $

 */

#ifndef _SYS_SELECT_H_

#define	_SYS_SELECT_H_

#include <sys/cdefs.h>

#include <sys/_types.h>

#include <sys/_sigset.h>

#include <sys/_timeval.h>

#include <sys/timespec.h>

typedef	unsigned long	__fd_mask;

#if __BSD_VISIBLE

typedef	__fd_mask	fd_mask;

#endif

#ifndef _SIGSET_T_DECLARED

#define	_SIGSET_T_DECLARED

typedef	__uint64_t sigset_t;

#endif

/*

 * Select uses bit masks of file descriptors in longs.  These macros

 * manipulate such bit fields (the filesystem macros use chars).

 * FD_SETSIZE may be defined by the user, but the default here should

 * be enough for most uses.

 */

#ifndef	FD_SETSIZE

#define	FD_SETSIZE	1024U

#endif

#define	_NFDBITS	(sizeof(__fd_mask) * 8)	/* bits per mask */

#if __BSD_VISIBLE

#define	NFDBITS		_NFDBITS

#endif

#ifndef _howmany

#define	_howmany(x, y)	(((x) + ((y) - 1)) / (y))

#endif

typedef	struct fd_set {

	__fd_mask	__fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];

} fd_set;

#if __BSD_VISIBLE

#define	fds_bits	__fds_bits

#endif

#define	__fdset_mask(n)	((__fd_mask)1 << ((n) % _NFDBITS))

#define	FD_CLR(n, p)	((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))

#if __BSD_VISIBLE

#define	FD_COPY(f, t)	(void)(*(t) = *(f))

#endif

#define	FD_ISSET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))

#define	FD_SET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))

#define	FD_ZERO(p) do {					\

	fd_set *_p;					\

	__size_t _n;					\

							\

	_p = (p);					\

	_n = _howmany(FD_SETSIZE, _NFDBITS);		\

	while (_n > 0)					\

		_p->__fds_bits[--_n] = 0;		\

} while (0)

#ifndef _KERNEL

__BEGIN_DECLS

#ifndef _SELECT_DECLARED

#define	_SELECT_DECLARED

/* XXX missing restrict type-qualifier */

IMPORT_C int	select(int, fd_set *, fd_set *, fd_set *, struct timeval *);

#endif

__END_DECLS

#endif /* !_KERNEL */

#endif /* _SYS_SELECT_H_ */