williamr@2: /*-
williamr@2:  * Copyright (c) 1992, 1993
williamr@2:  *	The Regents of the University of California.  All rights reserved.
williamr@2:  *
williamr@2:  * Redistribution and use in source and binary forms, with or without
williamr@2:  * modification, are permitted provided that the following conditions
williamr@2:  * are met:
williamr@2:  * 1. Redistributions of source code must retain the above copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer.
williamr@2:  * 2. Redistributions in binary form must reproduce the above copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer in the
williamr@2:  *    documentation and/or other materials provided with the distribution.
williamr@2:  * 4. Neither the name of the University nor the names of its contributors
williamr@2:  *    may be used to endorse or promote products derived from this software
williamr@2:  *    without specific prior written permission.
williamr@2:  *
williamr@2:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
williamr@2:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
williamr@2:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
williamr@2:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
williamr@2:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
williamr@2:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
williamr@2:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
williamr@2:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
williamr@2:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
williamr@2:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
williamr@2:  * SUCH DAMAGE.
williamr@2:  *
williamr@2:  * $FreeBSD: src/sys/sys/select.h,v 1.19 2004/04/07 04:19:49 imp Exp $
williamr@2:  */
williamr@2: 
williamr@2: #ifndef _SYS_SELECT_H_
williamr@2: #define	_SYS_SELECT_H_
williamr@2: 
williamr@2: #include <sys/cdefs.h>
williamr@2: #include <sys/_types.h>
williamr@2: 
williamr@2: #include <sys/_sigset.h>
williamr@2: #include <sys/_timeval.h>
williamr@2: #include <sys/timespec.h>
williamr@2: 
williamr@2: 
williamr@2: typedef	unsigned long	__fd_mask;
williamr@2: #if __BSD_VISIBLE
williamr@2: typedef	__fd_mask	fd_mask;
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef _SIGSET_T_DECLARED
williamr@2: #define	_SIGSET_T_DECLARED
williamr@2: typedef	__uint64_t sigset_t;
williamr@2: #endif
williamr@2: 
williamr@2: /*
williamr@2:  * Select uses bit masks of file descriptors in longs.  These macros
williamr@2:  * manipulate such bit fields (the filesystem macros use chars).
williamr@2:  * FD_SETSIZE may be defined by the user, but the default here should
williamr@2:  * be enough for most uses.
williamr@2:  */
williamr@2: #ifndef	FD_SETSIZE
williamr@2: #define	FD_SETSIZE	1024U
williamr@2: #endif
williamr@2: 
williamr@2: #define	_NFDBITS	(sizeof(__fd_mask) * 8)	/* bits per mask */
williamr@2: #if __BSD_VISIBLE
williamr@2: #define	NFDBITS		_NFDBITS
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef _howmany
williamr@2: #define	_howmany(x, y)	(((x) + ((y) - 1)) / (y))
williamr@2: #endif
williamr@2: 
williamr@2: typedef	struct fd_set {
williamr@2: 	__fd_mask	__fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
williamr@2: } fd_set;
williamr@2: #if __BSD_VISIBLE
williamr@2: #define	fds_bits	__fds_bits
williamr@2: #endif
williamr@2: 
williamr@2: #define	__fdset_mask(n)	((__fd_mask)1 << ((n) % _NFDBITS))
williamr@2: #define	FD_CLR(n, p)	((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
williamr@2: #if __BSD_VISIBLE
williamr@2: #define	FD_COPY(f, t)	(void)(*(t) = *(f))
williamr@2: #endif
williamr@2: #define	FD_ISSET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
williamr@2: #define	FD_SET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
williamr@2: #define	FD_ZERO(p) do {					\
williamr@2: 	fd_set *_p;					\
williamr@2: 	__size_t _n;					\
williamr@2: 							\
williamr@2: 	_p = (p);					\
williamr@2: 	_n = _howmany(FD_SETSIZE, _NFDBITS);		\
williamr@2: 	while (_n > 0)					\
williamr@2: 		_p->__fds_bits[--_n] = 0;		\
williamr@2: } while (0)
williamr@2: 
williamr@2: #ifndef _KERNEL
williamr@2: 
williamr@2: __BEGIN_DECLS
williamr@2: #ifndef _SELECT_DECLARED
williamr@2: #define	_SELECT_DECLARED
williamr@2: /* XXX missing restrict type-qualifier */
williamr@2: IMPORT_C int	select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
williamr@2: #endif
williamr@2: __END_DECLS
williamr@2: #endif /* !_KERNEL */
williamr@2: 
williamr@2: #endif /* _SYS_SELECT_H_ */