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FreeBSD/Linux Kernel Cross Reference
sys/sys/select.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  * $FreeBSD: src/sys/sys/select.h,v 1.18 2002/12/31 04:13:50 mike Exp $
   34  */
   35 
   36 #ifndef _SYS_SELECT_H_
   37 #define _SYS_SELECT_H_
   38 
   39 #include <sys/cdefs.h>
   40 #include <sys/_types.h>
   41 
   42 #include <sys/_sigset.h>
   43 #include <sys/_timeval.h>
   44 #include <sys/timespec.h>
   45 
   46 typedef unsigned long   __fd_mask;
   47 #if __BSD_VISIBLE
   48 typedef __fd_mask       fd_mask;
   49 #endif
   50 
   51 #ifndef _SIGSET_T_DECLARED
   52 #define _SIGSET_T_DECLARED
   53 typedef __sigset_t      sigset_t;
   54 #endif
   55 
   56 /*
   57  * Select uses bit masks of file descriptors in longs.  These macros
   58  * manipulate such bit fields (the filesystem macros use chars).
   59  * FD_SETSIZE may be defined by the user, but the default here should
   60  * be enough for most uses.
   61  */
   62 #ifndef FD_SETSIZE
   63 #define FD_SETSIZE      1024U
   64 #endif
   65 
   66 #define _NFDBITS        (sizeof(__fd_mask) * 8) /* bits per mask */
   67 #if __BSD_VISIBLE
   68 #define NFDBITS         _NFDBITS
   69 #endif
   70 
   71 #ifndef _howmany
   72 #define _howmany(x, y)  (((x) + ((y) - 1)) / (y))
   73 #endif
   74 
   75 typedef struct fd_set {
   76         __fd_mask       __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
   77 } fd_set;
   78 #if __BSD_VISIBLE
   79 #define fds_bits        __fds_bits
   80 #endif
   81 
   82 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
   83 #define FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
   84 #if __BSD_VISIBLE
   85 #define FD_COPY(f, t)   (void)(*(t) = *(f))
   86 #endif
   87 #define FD_ISSET(n, p)  ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
   88 #define FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
   89 #define FD_ZERO(p) do {                                 \
   90         fd_set *_p;                                     \
   91         __size_t _n;                                    \
   92                                                         \
   93         _p = (p);                                       \
   94         _n = _howmany(FD_SETSIZE, _NFDBITS);            \
   95         while (_n > 0)                                  \
   96                 _p->__fds_bits[--_n] = 0;               \
   97 } while (0)
   98 
   99 #ifndef _KERNEL
  100 
  101 __BEGIN_DECLS
  102 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
  103         const struct timespec *__restrict, const sigset_t *__restrict);
  104 #ifndef _SELECT_DECLARED
  105 #define _SELECT_DECLARED
  106 /* XXX missing restrict type-qualifier */
  107 int     select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
  108 #endif
  109 __END_DECLS
  110 #endif /* !_KERNEL */
  111 
  112 #endif /* _SYS_SELECT_H_ */

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