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 /*      $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos 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  *      from: @(#)types.h       8.4 (Berkeley) 1/21/94
   32  */
   33 
   34 #ifndef _SYS_FD_SET_H_
   35 #define _SYS_FD_SET_H_
   36 
   37 #include <sys/cdefs.h>
   38 #include <sys/featuretest.h>
   39 #include <machine/int_types.h>
   40 
   41 /*
   42  * Implementation dependent defines, hidden from user space. X/Open does not
   43  * specify them.
   44  */
   45 #define __NBBY          8               /* number of bits in a byte */
   46 typedef __int32_t       __fd_mask;
   47 
   48 /* bits per mask */
   49 #define __NFDBITS       ((unsigned int)sizeof(__fd_mask) * __NBBY)
   50 
   51 #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
   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      256
   61 #endif
   62 
   63 typedef struct fd_set {
   64         __fd_mask       fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
   65 } fd_set;
   66 
   67 #define FD_SET(n, p)    \
   68     ((p)->fds_bits[(n)/__NFDBITS] |= (1 << ((n) % __NFDBITS)))
   69 #define FD_CLR(n, p)    \
   70     ((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS)))
   71 #define FD_ISSET(n, p)  \
   72     ((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS)))
   73 #if __GNUC_PREREQ__(2, 95)
   74 #define FD_ZERO(p)      (void)__builtin_memset((p), 0, sizeof(*(p)))
   75 #else
   76 #define FD_ZERO(p)      do {                                            \
   77         fd_set *__fds = (p);                                            \
   78         unsigned int __i;                                               \
   79         for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++)    \
   80                 __fds->fds_bits[__i] = 0;                               \
   81         } while (/* CONSTCOND */ 0)
   82 #endif /* GCC 2.95 */
   83 
   84 /*
   85  * Expose our internals if we are not required to hide them.
   86  */
   87 #if defined(_NETBSD_SOURCE)
   88 
   89 #define fd_mask __fd_mask
   90 #define NFDBITS __NFDBITS
   91 #ifndef howmany
   92 #define howmany(a, b) __howmany(a, b)
   93 #endif
   94 
   95 #if __GNUC_PREREQ__(2, 95)
   96 #define FD_COPY(f, t)   (void)__builtin_memcpy((t), (f), sizeof(*(f)))
   97 #else
   98 #define FD_COPY(f, t)   do {                                            \
   99         fd_set *__f = (f), *__t = (t);                                  \
  100         unsigned int __i;                                               \
  101         for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++)    \
  102                 __t->fds_bits[__i] = __f->fds_bits[__i];                \
  103         } while (/* CONSTCOND */ 0)
  104 #endif /* GCC 2.95 */
  105 
  106 #endif /* _NETBSD_SOURCE */
  107 
  108 #endif /* _SYS_FD_SET_H_ */

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