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Annotation of researchv9/X11/src/X.V11R1/lib/Xtk/fd.h, revision 1.1

1.1     ! root        1: /*
        !             2: * $Header: fd.h,v 1.2 87/09/11 21:25:18 haynes Rel $
        !             3: */
        !             4: 
        !             5: /*
        !             6:  * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
        !             7:  * 
        !             8:  *                         All Rights Reserved
        !             9:  * 
        !            10:  * Permission to use, copy, modify, and distribute this software and its 
        !            11:  * documentation for any purpose and without fee is hereby granted, 
        !            12:  * provided that the above copyright notice appear in all copies and that
        !            13:  * both that copyright notice and this permission notice appear in 
        !            14:  * supporting documentation, and that the name of Digital Equipment
        !            15:  * Corporation not be used in advertising or publicity pertaining to
        !            16:  * distribution of the software without specific, written prior permission.  
        !            17:  * 
        !            18:  * 
        !            19:  * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            20:  * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            21:  * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            22:  * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            23:  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            24:  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            25:  * SOFTWARE.
        !            26:  */
        !            27: #ifndef __fd_set
        !            28: #define __fd_set
        !            29: #ifndef NBBY
        !            30: #define        NBBY    8               /* number of bits in a byte */
        !            31: #endif
        !            32: /*
        !            33:  * Select uses bit masks of file descriptors in longs.
        !            34:  * These macros manipulate such bit fields (the filesystem macros use chars).
        !            35:  * FD_SETSIZE may be defined by the user, but the default here
        !            36:  * should be >= NOFILE (param.h).
        !            37:  */
        !            38: #ifndef        FD_SETSIZE
        !            39: #define        FD_SETSIZE      256
        !            40: #endif
        !            41: 
        !            42: typedef long   fd_mask;
        !            43: #define NFDBITS        (sizeof(fd_mask) * NBBY)        /* bits per mask */
        !            44: #ifndef howmany
        !            45: #define        howmany(x, y)   (((x)+((y)-1))/(y))
        !            46: #endif
        !            47: 
        !            48: typedef        struct Fd_set {
        !            49:        fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
        !            50: } Fd_set;
        !            51: 
        !            52: #define        FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
        !            53: #define        FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
        !            54: #define        FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
        !            55: 
        !            56: #endif

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