1 /*- 2 * Copyright (c) 1997 Peter Wemm <peter@freebsd.org> 3 * 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. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/sys/poll.h,v 1.6.2.1 2000/08/21 12:25:58 sheldonh Exp $ 29 * $DragonFly: src/sys/sys/poll.h,v 1.7 2008/01/12 06:01:27 nant Exp $ 30 */ 31 32 #ifndef _SYS_POLL_H_ 33 #define _SYS_POLL_H_ 34 35 /* 36 * This file is intended to be compatible with the traditional poll.h. 37 */ 38 39 typedef unsigned int nfds_t; 40 41 /* 42 * This structure is passed as an array to poll(2). 43 */ 44 struct pollfd { 45 int fd; /* which file descriptor to poll */ 46 short events; /* events we are interested in */ 47 short revents; /* events found on return */ 48 }; 49 50 /* 51 * Requestable events. If poll(2) finds any of these set, they are 52 * copied to revents on return. 53 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI 54 * and POLLRDBAND since none of the file types have distinct priority 55 * bands - and only some have an urgent "mode". 56 * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV 57 * POLLIN includes all of normal, band and urgent data. Most poll handlers 58 * on FreeBSD only treat it as "normal" data. 59 */ 60 #define POLLIN 0x0001 /* any readable data available */ 61 #define POLLPRI 0x0002 /* OOB/Urgent readable data */ 62 #define POLLOUT 0x0004 /* file descriptor is writeable */ 63 #define POLLRDNORM 0x0040 /* non-OOB/URG data available */ 64 #define POLLWRNORM POLLOUT /* no write type differentiation */ 65 #define POLLRDBAND 0x0080 /* OOB/Urgent readable data */ 66 #define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */ 67 68 /* 69 * These events are set if they occur regardless of whether they were 70 * requested. 71 */ 72 #define POLLERR 0x0008 /* some poll error occurred */ 73 #define POLLHUP 0x0010 /* file descriptor was "hung up" */ 74 #define POLLNVAL 0x0020 /* requested events "invalid" */ 75 76 #define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\ 77 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL) 78 79 /* 80 * Request that poll() wait forever. 81 * XXX in SYSV, this is defined in stropts.h, which is not included 82 * by poll.h. 83 */ 84 #define INFTIM (-1) 85 86 #ifndef _KERNEL 87 88 #include <sys/cdefs.h> 89 90 __BEGIN_DECLS 91 /* 92 * XXX logically, poll() should be declared in <poll.h>, but SVR4 at 93 * least has it here in <sys/poll.h>. 94 */ 95 int poll (struct pollfd *, nfds_t, int); 96 __END_DECLS 97 98 #endif /* !_KERNEL */ 99 100 #endif /* !_SYS_POLL_H_ */ 101