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

     /*      $OpenBSD: select.h,v 1.17 2016/09/12 19:41:20 guenther Exp $    */
     
     /*-
      * 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. 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.
     *
     *      @(#)select.h    8.2 (Berkeley) 1/4/94
     */
    
    #ifndef _SYS_SELECT_H_
    #define _SYS_SELECT_H_
    
    #include <sys/types.h>
    
    #ifndef _TIMEVAL_DECLARED
    #define _TIMEVAL_DECLARED
    struct timeval {
            time_t          tv_sec;         /* seconds */
            suseconds_t     tv_usec;        /* and microseconds */
    };
    #endif
    
    #ifndef _TIMESPEC_DECLARED
    #define _TIMESPEC_DECLARED
    struct timespec {
            time_t  tv_sec;         /* seconds */
            long    tv_nsec;        /* and nanoseconds */
    };
    #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      1024
    #endif
    
    /*
     * We don't want to pollute the namespace with select(2) internals.
     * Non-underscore versions are exposed later #if __BSD_VISIBLE
     */
    #define __NBBY  8                               /* number of bits in a byte */
    typedef uint32_t __fd_mask;
    #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
    #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
    
    typedef struct fd_set {
            __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
    } fd_set;
    
    static __inline void
    __fd_set(int fd, fd_set *p)
    {
            p->fds_bits[fd / __NFDBITS] |= (1U << (fd % __NFDBITS));
    }
    #define FD_SET(n, p)    __fd_set((n), (p))
    
    static __inline void
    __fd_clr(int fd, fd_set *p)
    {
            p->fds_bits[fd / __NFDBITS] &= ~(1U << (fd % __NFDBITS));
    }
    #define FD_CLR(n, p)    __fd_clr((n), (p))
    
    static __inline int
    __fd_isset(int fd, const fd_set *p)
    {
            return (p->fds_bits[fd / __NFDBITS] & (1U << (fd % __NFDBITS)));
    }
    #define FD_ISSET(n, p)  __fd_isset((n), (p))
    
    #if __BSD_VISIBLE
   #define FD_COPY(f, t)   (void)(*(t) = *(f))
   #endif
   #define FD_ZERO(p) do {                                 \
           fd_set *_p = (p);                               \
           __size_t _n = __howmany(FD_SETSIZE, __NFDBITS); \
                                                           \
           while (_n > 0)                                  \
                   _p->fds_bits[--_n] = 0;                 \
   } while (0)
   
   #if __BSD_VISIBLE
   #define NBBY    __NBBY
   #define fd_mask __fd_mask
   #define NFDBITS __NFDBITS
   #ifndef howmany
   #define howmany(x, y)   __howmany(x, y)
   #endif
   #endif /* __BSD_VISIBLE */
   
   #ifndef _KERNEL
   #ifndef _SIGSET_T_DEFINED_
   #define _SIGSET_T_DEFINED_
   typedef unsigned int sigset_t;
   #endif
   
   #ifndef _SELECT_DEFINED_
   #define _SELECT_DEFINED_
   __BEGIN_DECLS
   int     select(int, fd_set * __restrict, fd_set * __restrict,
               fd_set * __restrict, struct timeval * __restrict);
   int     pselect(int, fd_set * __restrict, fd_set * __restrict,
               fd_set * __restrict, const struct timespec * __restrict,
               const sigset_t * __restrict);
   __END_DECLS
   #endif
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_SELECT_H_ */

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