/*-

  * 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_ */