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Annotation of sys/sys/select.h, Revision 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_ */