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 * $FreeBSD$ 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 42 typedef unsigned long __fd_mask; 43 #if __BSD_VISIBLE 44 typedef __fd_mask fd_mask; 45 #endif 46 47 #ifndef _SIGSET_T_DECLARED 48 #define _SIGSET_T_DECLARED 49 typedef __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 71 typedef 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 98 int 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 */ 103 int 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