The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/fd_set.h

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    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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)select.h    8.2 (Berkeley) 1/4/94
   34  * $FreeBSD: src/sys/sys/select.h,v 1.6.2.1 2000/05/05 03:50:02 jlemon Exp $
   35  * $DragonFly: src/sys/sys/fd_set.h,v 1.3 2008/05/30 08:07:22 corecode Exp $
   36  */
   37 
   38 #ifndef _SYS_FD_SET_H_
   39 #define _SYS_FD_SET_H_
   40 
   41 /*
   42  * Select uses bit masks of file descriptors in longs.  These macros
   43  * manipulate such bit fields (the filesystem macros use chars).
   44  * FD_SETSIZE may be defined by the user, but the default here should
   45  * be enough for most uses.
   46  */
   47 #ifndef FD_SETSIZE
   48 #define FD_SETSIZE      1024
   49 #endif
   50 
   51 #define __NBBY          8               /* number of bits in a byte */
   52 
   53 typedef unsigned long   __fd_mask;
   54 #define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY)    /* bits per mask */
   55 
   56 #ifndef __howmany
   57 #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
   58 #endif
   59 
   60 typedef struct fd_set {
   61         __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
   62 } fd_set;
   63 
   64 #define _fdset_mask(n)  ((__fd_mask)1 << ((n) % __NFDBITS))
   65 #define FD_SET(n, p)    ((p)->fds_bits[(n)/__NFDBITS] |= _fdset_mask(n))
   66 #define FD_CLR(n, p)    ((p)->fds_bits[(n)/__NFDBITS] &= ~_fdset_mask(n))
   67 #define FD_ISSET(n, p)  ((p)->fds_bits[(n)/__NFDBITS] & _fdset_mask(n))
   68 #define FD_ZERO(p)      __builtin_memset((p), 0, sizeof(*(p)))
   69 
   70 
   71 /*
   72  * Expose classic BSD names if we're not running in conformance mode.
   73  */
   74 #ifdef __BSD_VISIBLE
   75 
   76 #define fd_mask __fd_mask
   77 #define NFDBITS __NFDBITS
   78 #ifndef howmany
   79 #define howmany(a, b)   __howmany(a, b)
   80 #endif
   81 
   82 #define FD_COPY(f, t)   __builtin_memcpy((t), (f), sizeof(*(f)))
   83 
   84 #endif /* __BSD_VISIBLE */
   85 
   86 #endif /* _SYS_FD_SET_H_ */

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