1/* 2 * Copyright (c) 2003-2012 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28#ifndef _FD_SET 29#define _FD_SET 30/* 31 * Select uses bit masks of file descriptors in longs. These macros 32 * manipulate such bit fields (the filesystem macros use chars). The 33 * extra protection here is to permit application redefinition above 34 * the default size. 35 */ 36#ifdef FD_SETSIZE 37#define __DARWIN_FD_SETSIZE FD_SETSIZE 38#else /* !FD_SETSIZE */ 39#define __DARWIN_FD_SETSIZE 1024 40#endif /* FD_SETSIZE */ 41#define __DARWIN_NBBY 8 /* bits in a byte */ 42#define __DARWIN_NFDBITS (sizeof(__int32_t) * __DARWIN_NBBY) /* bits per mask */ 43#define __DARWIN_howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1)) /* # y's == x bits? */ 44 45__BEGIN_DECLS 46typedef struct fd_set { 47 __int32_t fds_bits[__DARWIN_howmany(__DARWIN_FD_SETSIZE, __DARWIN_NFDBITS)]; 48} fd_set; 49__END_DECLS 50 51/* This inline avoids argument side-effect issues with FD_ISSET() */ 52static __inline int 53__darwin_fd_isset(int _n, const struct fd_set *_p) 54{ 55 return (_p->fds_bits[(unsigned long)_n/__DARWIN_NFDBITS] & ((__int32_t)(1<<((unsigned long)_n % __DARWIN_NFDBITS)))); 56} 57 58#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) 59#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) 60#define __DARWIN_FD_ISSET(n, p) __darwin_fd_isset((n), (p)) 61 62#if __GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3 63/* 64 * Use the built-in bzero function instead of the library version so that 65 * we do not pollute the namespace or introduce prototype warnings. 66 */ 67#define __DARWIN_FD_ZERO(p) __builtin_bzero(p, sizeof(*(p))) 68#else 69#define __DARWIN_FD_ZERO(p) bzero(p, sizeof(*(p))) 70#endif 71 72#define __DARWIN_FD_COPY(f, t) bcopy(f, t, sizeof(*(f))) 73#endif /* _FD_SET */ 74