1 /*-

     2  * Copyright (c) 1992, 1993

     3  *	The Regents of the University of California.  All rights reserved.

     4  *

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

     6  * modification, are permitted provided that the following conditions

     7  * are met:

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

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

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

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

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

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

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

    15  *    without specific prior written permission.

    16  *

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

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

    19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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

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

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

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

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

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

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

    27  * SUCH DAMAGE.

    28  *

    29  * $FreeBSD: src/sys/sys/select.h,v 1.19 2004/04/07 04:19:49 imp Exp $

    30  */

    31 

    32 #ifndef _SYS_SELECT_H_

    33 #define	_SYS_SELECT_H_

    34 

    35 #include <sys/cdefs.h>

    36 #include <sys/_types.h>

    37 

    38 #include <sys/_sigset.h>

    39 #include <sys/_timeval.h>

    40 #include <sys/timespec.h>

    41 

    42 

    43 typedef	unsigned long	__fd_mask;

    44 #if __BSD_VISIBLE

    45 typedef	__fd_mask	fd_mask;

    46 #endif

    47 

    48 #ifndef _SIGSET_T_DECLARED

    49 #define	_SIGSET_T_DECLARED

    50 typedef	__uint64_t sigset_t;

    51 #endif

    52 

    53 /*

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

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

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

    57  * be enough for most uses.

    58  */

    59 #ifndef	FD_SETSIZE

    60 #define	FD_SETSIZE	1024U

    61 #endif

    62 

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

    64 #if __BSD_VISIBLE

    65 #define	NFDBITS		_NFDBITS

    66 #endif

    67 

    68 #ifndef _howmany

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

    70 #endif

    71 

    72 typedef	struct fd_set {

    73 	__fd_mask	__fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];

    74 } fd_set;

    75 #if __BSD_VISIBLE

    76 #define	fds_bits	__fds_bits

    77 #endif

    78 

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

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

    81 #if __BSD_VISIBLE

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

    83 #endif

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

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

    86 #define	FD_ZERO(p) do {					\

    87 	fd_set *_p;					\

    88 	__size_t _n;					\

    89 							\

    90 	_p = (p);					\

    91 	_n = _howmany(FD_SETSIZE, _NFDBITS);		\

    92 	while (_n > 0)					\

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

    94 } while (0)

    95 

    96 #ifndef _KERNEL

    97 

    98 __BEGIN_DECLS

    99 #ifndef _SELECT_DECLARED

   100 #define	_SELECT_DECLARED

   101 /* XXX missing restrict type-qualifier */

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

   103 #endif

   104 __END_DECLS

   105 #endif /* !_KERNEL */

   106 

   107 #endif /* _SYS_SELECT_H_ */