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1 /* $NetBSD: fd_set.h,v 1.2 2005/12/11 12:25:20 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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)
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31 * from: @(#)types.h 8.4 (Berkeley) 1/21/94
34 #ifndef _SYS_FD_SET_H_
35 #define _SYS_FD_SET_H_
37 #include <sys/EfiCdefs.h>
38 #include <machine/int_types.h>
41 * Implementation dependent defines, hidden from user space. X/Open does not
44 #define __NBBY 8 /* number of bits in a byte */
45 typedef __int32_t __fd_mask
;
48 #define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY)
50 #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
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.
59 #define FD_SETSIZE 256
62 typedef struct fd_set
{
63 __fd_mask fds_bits
[__howmany(FD_SETSIZE
, __NFDBITS
)];
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)))
75 #define FD_ZERO(p) do { \
76 fd_set *__fds = (p); \
78 for (__i = 0; __i < __howmany(FD_SETSIZE, __NFDBITS); __i++) \
79 __fds->fds_bits[__i] = 0; \
80 } while (/* CONSTCOND */ 0)
84 * Expose our internals if we are not required to hide them.
86 #if defined(_NETBSD_SOURCE)
88 #define fd_mask __fd_mask
89 #define NFDBITS __NFDBITS
91 #define howmany(a, b) __howmany(a, b)
94 #if __GNUC_PREREQ__(2, 95)
95 #define FD_COPY(f, t) (void)__builtin_memcpy((t), (f), sizeof(*(f)))
97 #define FD_COPY(f, t) do { \
98 fd_set *__f = (f), *__t = (t); \
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 */
105 #endif /* _NETBSD_SOURCE */
107 #endif /* _SYS_FD_SET_H_ */