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

1.1       root        1: /* $Header: fd.h,v 1.1 87/09/11 07:59:18 toddb Exp $ */
                      2: /*
                      3:  * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
                      4:  * 
                      5:  *                         All Rights Reserved
                      6:  * 
                      7:  * Permission to use, copy, modify, and distribute this software and its 
                      8:  * documentation for any purpose and without fee is hereby granted, 
                      9:  * provided that the above copyright notice appear in all copies and that
                     10:  * both that copyright notice and this permission notice appear in 
                     11:  * supporting documentation, and that the name of Digital Equipment
                     12:  * Corporation not be used in advertising or publicity pertaining to
                     13:  * distribution of the software without specific, written prior permission.  
                     14:  * 
                     15:  * 
                     16:  * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
                     17:  * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
                     18:  * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
                     19:  * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
                     20:  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
                     21:  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     22:  * SOFTWARE.
                     23:  */
                     24: 
                     25: #ifndef __fd_set
                     26: #define __fd_set
                     27: #ifndef NBBY
                     28: #define        NBBY    8               /* number of bits in a byte */
                     29: #endif
                     30: /*
                     31:  * Select uses bit masks of file descriptors in longs.
                     32:  * These macros manipulate such bit fields (the filesystem macros use chars).
                     33:  * FD_SETSIZE may be defined by the user, but the default here
                     34:  * should be >= NOFILE (param.h).
                     35:  */
                     36: #ifndef        FD_SETSIZE
                     37: #define        FD_SETSIZE      256
                     38: #endif
                     39: 
                     40: typedef long   fd_mask;
                     41: #define NFDBITS        (sizeof(fd_mask) * NBBY)        /* bits per mask */
                     42: #ifndef howmany
                     43: #define        howmany(x, y)   (((x)+((y)-1))/(y))
                     44: #endif
                     45: 
                     46: typedef        struct Fd_set {
                     47:        fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
                     48: } Fd_set;
                     49: 
                     50: #define        FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
                     51: #define        FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
                     52: #define        FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
                     53: 
                     54: #endif

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