gonzui

    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_ */