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
 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_ */