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 44 typedef unsigned long __fd_mask; 45 #if __BSD_VISIBLE 46 typedef __fd_mask fd_mask; 47 #endif 48 49 #ifndef _SIGSET_T_DECLARED 50 #define _SIGSET_T_DECLARED 51 typedef __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 73 typedef 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 100 int 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 */ 105 int 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