Move definition of fd_set to sys/fd_set.h.
[games.git] / sys / sys / fd_set.h
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1/*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)select.h 8.2 (Berkeley) 1/4/94
34 * $FreeBSD: src/sys/sys/select.h,v 1.6.2.1 2000/05/05 03:50:02 jlemon Exp $
35 * $DragonFly: src/sys/sys/fd_set.h,v 1.1 2008/05/28 10:35:11 corecode Exp $
36 */
37
38#ifndef _SYS_FD_SET_H_
39#define _SYS_FD_SET_H_
40
41/*
42 * Select uses bit masks of file descriptors in longs. These macros
43 * manipulate such bit fields (the filesystem macros use chars).
44 * FD_SETSIZE may be defined by the user, but the default here should
45 * be enough for most uses.
46 */
47#ifndef FD_SETSIZE
48#define FD_SETSIZE 1024
49#endif
50
51#define __NBBY 8 /* number of bits in a byte */
52
53typedef unsigned long __fd_mask;
54#define __NFDBITS ((unsigned int)sizeof(__fd_mask) * __NBBY) /* bits per mask */
55
56#ifndef __howmany
57#define __howmany(x, y) (((x) + ((y) - 1)) / (y))
58#endif
59
60typedef struct fd_set {
61 __fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
62} fd_set;
63
64#define _fdset_mask(n) ((fd_mask)1 << ((n) % NFDBITS))
65#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= _fdset_mask(n))
66#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~_fdset_mask(n))
67#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & _fdset_mask(n))
68#define FD_ZERO(p) __builtin_memset((p), 0, sizeof(*(p)))
69
70
71/*
72 * Expose classic BSD names if we're not running in conformance mode.
73 */
74#ifdef __BSD_VISIBLE
75
76#define fd_mask __fd_mask
77#define NFDBITS __NFDBITS
78#ifndef howmany
79#define howmany(a, b) __howmany(a, b)
80#endif
81
82#define FD_COPY(f, t) __builtin_memcpy((t), (f), sizeof(*(f)))
83
84#endif /* __BSD_VISIBLE */
85
86#endif /* _SYS_FD_SET_H_ */