1 /* $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos Exp $ */ 2 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 * from: @(#)types.h 8.4 (Berkeley) 1/21/94 32 */ 33 34 #ifndef _SYS_FD_SET_H_ 35 #define _SYS_FD_SET_H_ 36 37 #include <sys/EfiCdefs.h> 38 #include <machine/int_types.h> 39 40 /* 41 * Implementation dependent defines, hidden from user space. X/Open does not 42 * specify them. 43 */ 44 #define __NBBY 8 /* number of bits in a byte */ 45 typedef __int32_t __fd_mask; 46 47 /* bits per mask */ 48 #define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY) 49 50 #define __howmany(x, y) (((x) + ((y) - 1)) / (y)) 51 52 /* 53 * Select uses bit masks of file descriptors in longs. These macros 54 * manipulate such bit fields (the filesystem macros use chars). 55 * FD_SETSIZE may be defined by the user, but the default here should 56 * be enough for most uses. 57 */ 58 #ifndef FD_SETSIZE 59 #define FD_SETSIZE 256 60 #endif 61 62 typedef struct fd_set { 63 __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)]; 64 } fd_set; 65 66 #define FD_SET(n, p) \ 67 ((p)->fds_bits[(n)/__NFDBITS] |= (1 << ((n) % __NFDBITS))) 68 #define FD_CLR(n, p) \ 69 ((p)->fds_bits[(n)/__NFDBITS] &= ~(1 << ((n) % __NFDBITS))) 70 #define FD_ISSET(n, p) \ 71 ((p)->fds_bits[(n)/__NFDBITS] & (1 << ((n) % __NFDBITS))) 72 #if __GNUC_PREREQ__(2, 95) 73 #define FD_ZERO(p) (void)__builtin_memset((p), 0, sizeof(*(p))) 74 #else 75 #define FD_ZERO(p) do { \ 76 fd_set *__fds = (p); \ 77 unsigned int __i; \ 78 for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \ 79 __fds->fds_bits[__i] = 0; \ 80 } while (/* CONSTCOND */ 0) 81 #endif /* GCC 2.95 */ 82 83 /* 84 * Expose our internals if we are not required to hide them. 85 */ 86 #if defined(_NETBSD_SOURCE) 87 88 #define fd_mask __fd_mask 89 #define NFDBITS __NFDBITS 90 #ifndef howmany 91 #define howmany(a, b) __howmany(a, b) 92 #endif 93 94 #if __GNUC_PREREQ__(2, 95) 95 #define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f))) 96 #else 97 #define FD_COPY(f, t) do { \ 98 fd_set *__f = (f), *__t = (t); \ 99 unsigned int __i; \ 100 for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \ 101 __t->fds_bits[__i] = __f->fds_bits[__i]; \ 102 } while (/* CONSTCOND */ 0) 103 #endif /* GCC 2.95 */ 104 105 #endif /* _NETBSD_SOURCE */ 106 107 #endif /* _SYS_FD_SET_H_ */ 108
