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Annotation of sys/sys/select.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: select.h,v 1.9 2006/03/21 08:17:33 otto Exp $ */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1992, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the University nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  *
                     31:  *     @(#)select.h    8.2 (Berkeley) 1/4/94
                     32:  */
                     33:
                     34: #ifndef _SYS_SELECT_H_
                     35: #define        _SYS_SELECT_H_
                     36:
                     37: #include <sys/cdefs.h>
                     38: #include <sys/time.h>          /* for types and struct timeval */
                     39:
                     40: /*
                     41:  * Select uses bit masks of file descriptors in longs.  These macros
                     42:  * manipulate such bit fields (the filesystem macros use chars).
                     43:  * FD_SETSIZE may be defined by the user, but the default here should
                     44:  * be enough for most uses.
                     45:  */
                     46: #ifndef        FD_SETSIZE
                     47: #define        FD_SETSIZE      1024
                     48: #endif
                     49:
                     50: /*
                     51:  * We don't want to pollute the namespace with select(2) internals.
                     52:  * Non-underscore versions are exposed later #if __BSD_VISIBLE
                     53:  */
                     54: #define        __NBBY  8                               /* number of bits in a byte */
                     55: typedef int32_t        __fd_mask;
                     56: #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
                     57: #define        __howmany(x, y) (((x) + ((y) - 1)) / (y))
                     58:
                     59: typedef        struct fd_set {
                     60:        __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
                     61: } fd_set;
                     62:
                     63: #define        FD_SET(n, p) \
                     64:        ((p)->fds_bits[(n) / __NFDBITS] |= (1 << ((n) % __NFDBITS)))
                     65: #define        FD_CLR(n, p) \
                     66:        ((p)->fds_bits[(n) / __NFDBITS] &= ~(1 << ((n) % __NFDBITS)))
                     67: #define        FD_ISSET(n, p) \
                     68:        ((p)->fds_bits[(n) / __NFDBITS] & (1 << ((n) % __NFDBITS)))
                     69: #ifdef _KERNEL
                     70: #define        FD_COPY(f, t)   bcopy(f, t, sizeof(*(f)))
                     71: #define        FD_ZERO(p)      bzero(p, sizeof(*(p)))
                     72: #else
                     73: #define        FD_COPY(f, t)   memcpy(t, f, sizeof(*(f)))
                     74: #define        FD_ZERO(p)      memset(p, 0, sizeof(*(p)))
                     75: #endif
                     76:
                     77: #if __BSD_VISIBLE
                     78: #define        NBBY    __NBBY
                     79: #define fd_mask        __fd_mask
                     80: #define NFDBITS        __NFDBITS
                     81: #ifndef howmany
                     82: #define howmany(x, y)  __howmany(x, y)
                     83: #endif
                     84: #endif /* __BSD_VISIBLE */
                     85:
                     86: #ifndef _KERNEL
                     87: #ifndef _SELECT_DEFINED_
                     88: #define _SELECT_DEFINED_
                     89: __BEGIN_DECLS
                     90: struct timeval;
                     91: int    select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
                     92: __END_DECLS
                     93: #endif
                     94: #endif /* !_KERNEL */
                     95:
                     96: #endif /* !_SYS_SELECT_H_ */

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