Add pselect syscall.
[dragonfly.git] / sys / sys / select.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 $
ae7cb1b5 35 * $DragonFly: src/sys/sys/select.h,v 1.10 2008/01/10 22:30:28 nth Exp $
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36 */
37
38#ifndef _SYS_SELECT_H_
39#define _SYS_SELECT_H_
40
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41#include <sys/cdefs.h>
42
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43#ifndef _SYS_SIGNAL_H_
44#include <sys/signal.h>
03d6a592 45#endif
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46#ifndef _SYS_TIME_H_
47#include <sys/time.h>
03d6a592 48#endif
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49
50/*
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51 * Select uses bit masks of file descriptors in longs. These macros
52 * manipulate such bit fields (the filesystem macros use chars).
53 * FD_SETSIZE may be defined by the user, but the default here should
54 * be enough for most uses.
984263bc 55 */
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56#ifndef FD_SETSIZE
57#define FD_SETSIZE 1024
58#endif
59
60#ifndef NBBY
61#define NBBY 8
62#endif
63
64typedef unsigned long fd_mask;
65#define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
66
67#ifndef howmany
68#define howmany(x, y) (((x) + ((y) - 1)) / (y))
69#endif
70
71typedef struct fd_set {
72 fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
73} fd_set;
984263bc 74
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75#define _fdset_mask(n) ((fd_mask)1 << ((n) % NFDBITS))
76#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= _fdset_mask(n))
77#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~_fdset_mask(n))
78#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & _fdset_mask(n))
79#define FD_COPY(f, t) bcopy(f, t, sizeof(*(f)))
80#define FD_ZERO(p) bzero(p, sizeof(*(p)))
984263bc 81
33138348 82__BEGIN_DECLS
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83#ifndef _SELECT_DECLARED
84#define _SELECT_DECLARED
85struct timeval;
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86int select(int, fd_set * __restrict, fd_set * __restrict,
87 fd_set * __restrict, struct timeval * __restrict);
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88struct timespec;
89int pselect(int, fd_set * __restrict, fd_set * __restrict,
90 fd_set * __restrict, const struct timespec * __restrict,
91 const sigset_t * __restrict);
984263bc 92#endif
33138348 93__END_DECLS
984263bc 94
03d6a592 95#endif /* !_SYS_SELECT_H_ */