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  * SPDX-License-Identifier: BSD-3-Clause
    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  * $FreeBSD$
   32  */
   33 
   34 #ifndef _SYS_SELECT_H_
   35 #define _SYS_SELECT_H_
   36 
   37 #include <sys/cdefs.h>
   38 #include <sys/_types.h>
   39 
   40 #include <sys/_sigset.h>
   41 #include <sys/_timeval.h>
   42 #include <sys/timespec.h>
   43 
   44 typedef unsigned long   __fd_mask;
   45 #if __BSD_VISIBLE
   46 typedef __fd_mask       fd_mask;
   47 #endif
   48 
   49 #ifndef _SIGSET_T_DECLARED
   50 #define _SIGSET_T_DECLARED
   51 typedef __sigset_t      sigset_t;
   52 #endif
   53 
   54 /*
   55  * Select uses bit masks of file descriptors in longs.  These macros
   56  * manipulate such bit fields (the filesystem macros use chars).
   57  * FD_SETSIZE may be defined by the user, but the default here should
   58  * be enough for most uses.
   59  */
   60 #ifndef FD_SETSIZE
   61 #define FD_SETSIZE      1024
   62 #endif
   63 
   64 #define _NFDBITS        (sizeof(__fd_mask) * 8) /* bits per mask */
   65 #if __BSD_VISIBLE
   66 #define NFDBITS         _NFDBITS
   67 #endif
   68 
   69 #ifndef _howmany
   70 #define _howmany(x, y)  (((x) + ((y) - 1)) / (y))
   71 #endif
   72 
   73 typedef struct fd_set {
   74         __fd_mask       __fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
   75 } fd_set;
   76 #if __BSD_VISIBLE
   77 #define fds_bits        __fds_bits
   78 #endif
   79 
   80 #define __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
   81 #define FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
   82 #if __BSD_VISIBLE
   83 #define FD_COPY(f, t)   (void)(*(t) = *(f))
   84 #endif
   85 #define FD_ISSET(n, p)  (((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
   86 #define FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
   87 #define FD_ZERO(p) do {                                 \
   88         fd_set *_p;                                     \
   89         __size_t _n;                                    \
   90                                                         \
   91         _p = (p);                                       \
   92         _n = _howmany(FD_SETSIZE, _NFDBITS);            \
   93         while (_n > 0)                                  \
   94                 _p->__fds_bits[--_n] = 0;               \
   95 } while (0)
   96 
   97 #ifndef _KERNEL
   98 
   99 __BEGIN_DECLS
  100 int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
  101         const struct timespec *__restrict, const sigset_t *__restrict);
  102 #ifndef _SELECT_DECLARED
  103 #define _SELECT_DECLARED
  104 /* XXX missing restrict type-qualifier */
  105 int     select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
  106 #endif
  107 __END_DECLS
  108 #endif /* !_KERNEL */
  109 
  110 #endif /* _SYS_SELECT_H_ */

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