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