sys/sys/select.h

   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/select.h,v 1.9 2006/06/18 01:00:35 corecode Exp $
  36  */
  37
  38 #ifndef _SYS_SELECT_H_
  39 #define _SYS_SELECT_H_
  40
  41 #include <sys/cdefs.h>
  42
  43 #ifndef _SYS_SIGNAL_H_
  44 #include <sys/signal.h>
  45 #endif
  46 #ifndef _SYS_TIME_H_
  47 #include <sys/time.h>
  48 #endif
  49
  50 /*
  51  * Select uses bit masks of file descriptors in longs.  These macros
  52  * manipulate such bit fields (the filesystem macros use chars).
  53  * FD_SETSIZE may be defined by the user, but the default here should
  54  * be enough for most uses.
  55  */
  56 #ifndef FD_SETSIZE
  57 #define FD_SETSIZE      1024
  58 #endif
  59
  60 #ifndef NBBY
  61 #define NBBY            8
  62 #endif
  63
  64 typedef unsigned long   fd_mask;
  65 #define NFDBITS (sizeof(fd_mask) * NBBY)        /* bits per mask */
  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
  75 #define _fdset_mask(n)  ((fd_mask)1 << ((n) % NFDBITS))
  76 #define FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= _fdset_mask(n))
  77 #define FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~_fdset_mask(n))
  78 #define FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & _fdset_mask(n))
  79 #define FD_COPY(f, t)   bcopy(f, t, sizeof(*(f)))
  80 #define FD_ZERO(p)      bzero(p, sizeof(*(p)))
  81
  82 __BEGIN_DECLS
  83 #ifndef _SELECT_DECLARED
  84 #define _SELECT_DECLARED
  85 struct timeval;
  86 int     select(int, fd_set * __restrict, fd_set * __restrict,
  87                fd_set * __restrict, struct timeval * __restrict);
  88 #endif
  89 __END_DECLS
  90
  91 #endif  /* !_SYS_SELECT_H_ */