/* * Copyright (c) 2003-2012 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef _FD_SET #define _FD_SET /* * Select uses bit masks of file descriptors in longs. These macros * manipulate such bit fields (the filesystem macros use chars). The * extra protection here is to permit application redefinition above * the default size. */ #ifdef FD_SETSIZE #define __DARWIN_FD_SETSIZE FD_SETSIZE #else /* !FD_SETSIZE */ #define __DARWIN_FD_SETSIZE 1024 #endif /* FD_SETSIZE */ #define __DARWIN_NBBY 8 /* bits in a byte */ #define __DARWIN_NFDBITS (sizeof(__int32_t) * __DARWIN_NBBY) /* bits per mask */ #define __DARWIN_howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1)) /* # y's == x bits? */ __BEGIN_DECLS typedef struct fd_set { __int32_t fds_bits[__DARWIN_howmany(__DARWIN_FD_SETSIZE, __DARWIN_NFDBITS)]; } fd_set; __END_DECLS /* This inline avoids argument side-effect issues with FD_ISSET() */ static __inline int __darwin_fd_isset(int _n, const struct fd_set *_p) { return (_p->fds_bits[(unsigned long)_n/__DARWIN_NFDBITS] & ((__int32_t)(1<<((unsigned long)_n % __DARWIN_NFDBITS)))); } #define __DARWIN_FD_SET(n, p) do { int __fd = (n); ((p)->fds_bits[(unsigned long)__fd/__DARWIN_NFDBITS] |= ((__int32_t)(1<<((unsigned long)__fd % __DARWIN_NFDBITS)))); } while(0) #define __DARWIN_FD_CLR(n, p) do { int __fd = (n); ((p)->fds_bits[(unsigned long)__fd/__DARWIN_NFDBITS] &= ~((__int32_t)(1<<((unsigned long)__fd % __DARWIN_NFDBITS)))); } while(0) #define __DARWIN_FD_ISSET(n, p) __darwin_fd_isset((n), (p)) #if __GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3 /* * Use the built-in bzero function instead of the library version so that * we do not pollute the namespace or introduce prototype warnings. */ #define __DARWIN_FD_ZERO(p) __builtin_bzero(p, sizeof(*(p))) #else #define __DARWIN_FD_ZERO(p) bzero(p, sizeof(*(p))) #endif #define __DARWIN_FD_COPY(f, t) bcopy(f, t, sizeof(*(f))) #endif /* _FD_SET */