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/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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 
   32 #ifndef _SYS_SELECT_H_
   33 #define _SYS_SELECT_H_
   34 
   35 #include <sys/cdefs.h>
   36 #include <sys/_types.h>
   37 
   38 #include <sys/_sigset.h>
   39 #include <sys/_timeval.h>
   40 #include <sys/timespec.h>
   41 
   42 typedef unsigned long   __fd_mask;
   43 #if __BSD_VISIBLE
   44 typedef __fd_mask       fd_mask;
   45 #endif
   46 
   47 #ifndef _SIGSET_T_DECLARED
   48 #define _SIGSET_T_DECLARED
   49 typedef __sigset_t      sigset_t;
   50 #endif
   51 
   52 /*
   53  * Select uses bit masks of file descriptors in longs.  These macros
   54  * manipulate such bit fields (the filesystem macros use chars).
   55  * FD_SETSIZE may be defined by the user, but the default here should
   56  * be enough for most uses.
   57  */
   58 #ifndef FD_SETSIZE
   59 #define FD_SETSIZE      1024U
   60 #endif
   61 
   62 #define _NFDBITS        (sizeof(__fd_mask) * 8) /* bits per mask */
   63 #if __BSD_VISIBLE
   64 #define NFDBITS         _NFDBITS
   65 #endif
   66 
   67 #ifndef _howmany
   68 #define _howmany(x, y)  (((x) + ((y) - 1)) / (y))
   69 #endif
   70 
   71 typedef struct fd_set {
   72         __fd_mask       __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
   73 } fd_set;
   74 #if __BSD_VISIBLE
   75 #define fds_bits        __fds_bits
   76 #endif
   77 
   78 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
   79 #define FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
   80 #if __BSD_VISIBLE
   81 #define FD_COPY(f, t)   (void)(*(t) = *(f))
   82 #endif
   83 #define FD_ISSET(n, p)  ((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n))
   84 #define FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
   85 #define FD_ZERO(p) do {                                 \
   86         fd_set *_p;                                     \
   87         __size_t _n;                                    \
   88                                                         \
   89         _p = (p);                                       \
   90         _n = _howmany(FD_SETSIZE, _NFDBITS);            \
   91         while (_n > 0)                                  \
   92                 _p->__fds_bits[--_n] = 0;               \
   93 } while (0)
   94 
   95 #ifndef _KERNEL
   96 
   97 __BEGIN_DECLS
   98 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
   99         const struct timespec *__restrict, const sigset_t *__restrict);
  100 #ifndef _SELECT_DECLARED
  101 #define _SELECT_DECLARED
  102 /* XXX missing restrict type-qualifier */
  103 int     select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
  104 #endif
  105 __END_DECLS
  106 #endif /* !_KERNEL */
  107 
  108 #endif /* _SYS_SELECT_H_ */

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