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