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

     /*-
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/5.0/sys/sys/select.h 107377 2002-11-28 15:34:32Z mike $
     */
    
    #ifndef _SYS_SELECT_H_
    #define _SYS_SELECT_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    
    #include <sys/_sigset.h>
    #include <sys/timespec.h>
    
    /*
     * XXX
     * Other things required for this header which we do not presently implement:
     *
     * struct timeval (with suseconds_t)
     */
    
    typedef unsigned long   __fd_mask;
    #if __BSD_VISIBLE
    typedef __fd_mask       fd_mask;
    #endif
    
    #ifndef _SIGSET_T_DECLARED
    #define _SIGSET_T_DECLARED
    typedef __sigset_t      sigset_t;
    #endif
    
    /*
     * Select uses bit masks of file descriptors in longs.  These macros
     * manipulate such bit fields (the filesystem macros use chars).
     * FD_SETSIZE may be defined by the user, but the default here should
     * be enough for most uses.
     */
    #ifndef FD_SETSIZE
    #define FD_SETSIZE      1024U
    #endif
    
    #define _NFDBITS        (sizeof(__fd_mask) * 8) /* bits per mask */
    #if __BSD_VISIBLE
    #define NFDBITS         _NFDBITS
    #endif
    
    #ifndef _howmany
    #define _howmany(x, y)  (((x) + ((y) - 1)) / (y))
    #endif
    
    typedef struct fd_set {
            __fd_mask       __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
    } fd_set;
    #if __BSD_VISIBLE
    #define fds_bits        __fds_bits
    #endif
    
    #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
    #define FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
    #if __BSD_VISIBLE
    #define FD_COPY(f, t)   (void)(*(t) = *(f))
    #endif
    #define FD_ISSET(n, p)  ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
    #define FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
    #define FD_ZERO(p) do {                                 \
            fd_set *_p;                                     \
            __size_t _n;                                    \
                                                            \
            _p = (p);                                       \
           _n = _howmany(FD_SETSIZE, _NFDBITS);            \
           while (_n > 0)                                  \
                   _p->__fds_bits[--_n] = 0;               \
   } while (0)
   
   #ifndef _KERNEL
   struct timeval;
   
   __BEGIN_DECLS
   int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
           const struct timespec *__restrict, const sigset_t *__restrict);
   #ifndef _SELECT_DECLARED
   #define _SELECT_DECLARED
   /* XXX missing restrict type-qualifier */
   int     select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
   #endif
   __END_DECLS
   #endif /* !_KERNEL */
   
   #endif /* _SYS_SELECT_H_ */

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