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 | #include <machine/types.h> /* __int32_t */ |
32 | |
33 | /* |
34 | * Select uses bit masks of file descriptors in longs. These macros |
35 | * manipulate such bit fields (the filesystem macros use chars). The |
36 | * extra protection here is to permit application redefinition above |
37 | * the default size. |
38 | */ |
39 | #ifdef FD_SETSIZE |
40 | #define __DARWIN_FD_SETSIZE FD_SETSIZE |
41 | #else /* !FD_SETSIZE */ |
42 | #define __DARWIN_FD_SETSIZE 1024 |
43 | #endif /* FD_SETSIZE */ |
44 | #define __DARWIN_NBBY 8 /* bits in a byte */ |
45 | #define __DARWIN_NFDBITS (sizeof(__int32_t) * __DARWIN_NBBY) /* bits per mask */ |
46 | #define __DARWIN_howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1)) /* # y's == x bits? */ |
47 | |
48 | __BEGIN_DECLS |
49 | typedef struct fd_set { |
50 | __int32_t fds_bits[__DARWIN_howmany(__DARWIN_FD_SETSIZE, __DARWIN_NFDBITS)]; |
51 | } fd_set; |
52 | __END_DECLS |
53 | |
54 | /* This inline avoids argument side-effect issues with FD_ISSET() */ |
55 | static __inline int |
56 | __darwin_fd_isset(int _n, const struct fd_set *_p) |
57 | { |
58 | return (_p->fds_bits[(unsigned long)_n/__DARWIN_NFDBITS] & ((__int32_t)(((unsigned long)1)<<((unsigned long)_n % __DARWIN_NFDBITS)))); |
59 | } |
60 | |
61 | #define __DARWIN_FD_SET(n, p) do { int __fd = (n); ((p)->fds_bits[(unsigned long)__fd/__DARWIN_NFDBITS] |= ((__int32_t)(((unsigned long)1)<<((unsigned long)__fd % __DARWIN_NFDBITS)))); } while(0) |
62 | #define __DARWIN_FD_CLR(n, p) do { int __fd = (n); ((p)->fds_bits[(unsigned long)__fd/__DARWIN_NFDBITS] &= ~((__int32_t)(((unsigned long)1)<<((unsigned long)__fd % __DARWIN_NFDBITS)))); } while(0) |
63 | #define __DARWIN_FD_ISSET(n, p) __darwin_fd_isset((n), (p)) |
64 | |
65 | #if __GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3 |
66 | /* |
67 | * Use the built-in bzero function instead of the library version so that |
68 | * we do not pollute the namespace or introduce prototype warnings. |
69 | */ |
70 | #define __DARWIN_FD_ZERO(p) __builtin_bzero(p, sizeof(*(p))) |
71 | #else |
72 | #define __DARWIN_FD_ZERO(p) bzero(p, sizeof(*(p))) |
73 | #endif |
74 | |
75 | #define __DARWIN_FD_COPY(f, t) bcopy(f, t, sizeof(*(f))) |
76 | #endif /* _FD_SET */ |
77 | |