select.h revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: stable/11/sys/sys/select.h 331722 2018-03-29 02:50:57Z eadler $
30 */
31
32#ifndef _SYS_SELECT_H_
33#define	_SYS_SELECT_H_
34
35#include <sys/cdefs.h>
36#include <sys/_types.h>
37
38#include <sys/_sigset.h>
39#include <sys/_timeval.h>
40#include <sys/timespec.h>
41
42typedef	unsigned long	__fd_mask;
43#if __BSD_VISIBLE
44typedef	__fd_mask	fd_mask;
45#endif
46
47#ifndef _SIGSET_T_DECLARED
48#define	_SIGSET_T_DECLARED
49typedef	__sigset_t	sigset_t;
50#endif
51
52/*
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.
57 */
58#ifndef	FD_SETSIZE
59#define	FD_SETSIZE	1024
60#endif
61
62#define	_NFDBITS	(sizeof(__fd_mask) * 8)	/* bits per mask */
63#if __BSD_VISIBLE
64#define	NFDBITS		_NFDBITS
65#endif
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;
74#if __BSD_VISIBLE
75#define	fds_bits	__fds_bits
76#endif
77
78#define	__fdset_mask(n)	((__fd_mask)1 << ((n) % _NFDBITS))
79#define	FD_CLR(n, p)	((p)->__fds_bits[(n)/_NFDBITS] &= ~__fdset_mask(n))
80#if __BSD_VISIBLE
81#define	FD_COPY(f, t)	(void)(*(t) = *(f))
82#endif
83#define	FD_ISSET(n, p)	(((p)->__fds_bits[(n)/_NFDBITS] & __fdset_mask(n)) != 0)
84#define	FD_SET(n, p)	((p)->__fds_bits[(n)/_NFDBITS] |= __fdset_mask(n))
85#define	FD_ZERO(p) do {					\
86	fd_set *_p;					\
87	__size_t _n;					\
88							\
89	_p = (p);					\
90	_n = _howmany(FD_SETSIZE, _NFDBITS);		\
91	while (_n > 0)					\
92		_p->__fds_bits[--_n] = 0;		\
93} while (0)
94
95#ifndef _KERNEL
96
97__BEGIN_DECLS
98int pselect(int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict,
99	const struct timespec *__restrict, const sigset_t *__restrict);
100#ifndef _SELECT_DECLARED
101#define	_SELECT_DECLARED
102/* XXX missing restrict type-qualifier */
103int	select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
104#endif
105__END_DECLS
106#endif /* !_KERNEL */
107
108#endif /* _SYS_SELECT_H_ */
109