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Annotation of researchv9/X11/src/X.V11R1/lib/Xtk/fd.h, revision 1.1.1.1

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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