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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)select.h 8.2 (Berkeley) 1/4/94 34 * $FreeBSD: src/sys/sys/select.h,v 1.6.2.1 2000/05/05 03:50:02 jlemon Exp $ 35 * $DragonFly: src/sys/sys/select.h,v 1.10 2008/01/10 22:30:28 nth Exp $ 36 */ 37 38 #ifndef _SYS_SELECT_H_ 39 #define _SYS_SELECT_H_ 40 41 #include <sys/cdefs.h> 42 43 #ifndef _SYS_SIGNAL_H_ 44 #include <sys/signal.h> 45 #endif 46 #ifndef _SYS_TIME_H_ 47 #include <sys/time.h> 48 #endif 49 50 /* 51 * Select uses bit masks of file descriptors in longs. These macros 52 * manipulate such bit fields (the filesystem macros use chars). 53 * FD_SETSIZE may be defined by the user, but the default here should 54 * be enough for most uses. 55 */ 56 #ifndef FD_SETSIZE 57 #define FD_SETSIZE 1024 58 #endif 59 60 #ifndef NBBY 61 #define NBBY 8 62 #endif 63 64 typedef unsigned long fd_mask; 65 #define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */ 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 75 #define _fdset_mask(n) ((fd_mask)1 << ((n) % NFDBITS)) 76 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= _fdset_mask(n)) 77 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~_fdset_mask(n)) 78 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & _fdset_mask(n)) 79 #define FD_COPY(f, t) bcopy(f, t, sizeof(*(f))) 80 #define FD_ZERO(p) bzero(p, sizeof(*(p))) 81 82 __BEGIN_DECLS 83 #ifndef _SELECT_DECLARED 84 #define _SELECT_DECLARED 85 struct timeval; 86 int select(int, fd_set * __restrict, fd_set * __restrict, 87 fd_set * __restrict, struct timeval * __restrict); 88 struct timespec; 89 int pselect(int, fd_set * __restrict, fd_set * __restrict, 90 fd_set * __restrict, const struct timespec * __restrict, 91 const sigset_t * __restrict); 92 #endif 93 __END_DECLS 94 95 #endif /* !_SYS_SELECT_H_ */ 96