1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
18 *
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)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD$
32 */
33
34#ifndef _SYS_SELECT_H_
35#define	_SYS_SELECT_H_
36
37#include <sys/cdefs.h>
38#include <sys/_types.h>
39
40#include <sys/_sigset.h>
41#include <sys/_timeval.h>
42#include <sys/timespec.h>
43
44typedef	unsigned long	__fd_mask;
45#if __BSD_VISIBLE
46typedef	__fd_mask	fd_mask;
47#endif
48
49#ifndef _SIGSET_T_DECLARED
50#define	_SIGSET_T_DECLARED
51typedef	__sigset_t	sigset_t;
52#endif
53
54/*
55 * Select uses bit masks of file descriptors in longs.  These macros
56 * manipulate such bit fields (the filesystem macros use chars).
57 * FD_SETSIZE may be defined by the user, but the default here should
58 * be enough for most uses.
59 */
60#ifndef	FD_SETSIZE
61#define	FD_SETSIZE	1024
62#endif
63
64#define	_NFDBITS	(sizeof(__fd_mask) * 8)	/* bits per mask */
65#if __BSD_VISIBLE
66#define	NFDBITS		_NFDBITS
67#endif
68
69#ifndef _howmany
70#define	_howmany(x, y)	(((x) + ((y) - 1)) / (y))
71#endif
72
73typedef	struct fd_set {
74	__fd_mask	__fds_bits[_howmany(FD_SETSIZE, _NFDBITS)];
75} fd_set;
76#if __BSD_VISIBLE
77#define	fds_bits	__fds_bits
78#endif
79
80#define	__fdset_mask(n)	((__fd_mask)1 << ((n) % _NFDBITS))
81#define	FD_CLR(n, p)	((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
82#if __BSD_VISIBLE
83#define	FD_COPY(f, t)	(void)(*(t) = *(f))
84#endif
85#define	FD_ISSET(n, p)	(((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
86#define	FD_SET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
87#define	FD_ZERO(p) do {					\
88	fd_set *_p;					\
89	__size_t _n;					\
90							\
91	_p = (p);					\
92	_n = _howmany(FD_SETSIZE, _NFDBITS);		\
93	while (_n > 0)					\
94		_p->__fds_bits[--_n] = 0;		\
95} while (0)
96
97#ifndef _KERNEL
98
99__BEGIN_DECLS
100int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
101	const struct timespec *__restrict, const sigset_t *__restrict);
102#ifndef _SELECT_DECLARED
103#define	_SELECT_DECLARED
104/* XXX missing restrict type-qualifier */
105int	select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
106#endif
107__END_DECLS
108#endif /* !_KERNEL */
109
110#endif /* _SYS_SELECT_H_ */
111