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 */ 30 31 #ifndef _SYS_POLL_H_ 32 #define _SYS_POLL_H_ 33 34 /* 35 * This file is intended to be compatable with the traditional poll.h. 36 */ 37 38 /* 39 * This structure is passed as an array to poll(2). 40 */ 41 struct pollfd { 42 int fd; /* which file descriptor to poll */ 43 short events; /* events we are interested in */ 44 short revents; /* events found on return */ 45 }; 46 47 /* 48 * Requestable events. If poll(2) finds any of these set, they are 49 * copied to revents on return. 50 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI 51 * and POLLRDBAND since none of the file types have distinct priority 52 * bands - and only some have an urgent "mode". 53 * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV 54 * POLLIN includes all of normal, band and urgent data. Most poll handlers 55 * on FreeBSD only treat it as "normal" data. 56 */ 57 #define POLLIN 0x0001 /* any readable data available */ 58 #define POLLPRI 0x0002 /* OOB/Urgent readable data */ 59 #define POLLOUT 0x0004 /* file descriptor is writeable */ 60 #define POLLRDNORM 0x0040 /* non-OOB/URG data available */ 61 #define POLLWRNORM POLLOUT /* no write type differentiation */ 62 #define POLLRDBAND 0x0080 /* OOB/Urgent readable data */ 63 #define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */ 64 65 /* 66 * FreeBSD extensions: polling on a regular file might return one 67 * of these events (currently only supported on UFS). 68 */ 69 #define POLLEXTEND 0x0200 /* file may have been extended */ 70 #define POLLATTRIB 0x0400 /* file attributes may have changed */ 71 #define POLLNLINK 0x0800 /* (un)link/rename may have happened */ 72 #define POLLWRITE 0x1000 /* file's contents may have changed */ 73 74 /* 75 * These events are set if they occur regardless of whether they were 76 * requested. 77 */ 78 #define POLLERR 0x0008 /* some poll error occurred */ 79 #define POLLHUP 0x0010 /* file descriptor was "hung up" */ 80 #define POLLNVAL 0x0020 /* requested events "invalid" */ 81 82 #define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\ 83 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL) 84 85 /* 86 * Request that poll() wait forever. 87 * XXX in SYSV, this is defined in stropts.h, which is not included 88 * by poll.h. 89 */ 90 #define INFTIM (-1) 91 92 #ifndef _KERNEL 93 94 #include <sys/cdefs.h> 95 96 __BEGIN_DECLS 97 /* 98 * XXX logically, poll() should be declared in <poll.h>, but SVR4 at 99 * least has it here in <sys/poll.h>. 100 * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the 101 * other BSDs. 102 */ 103 int poll __P((struct pollfd *_pfd, unsigned int _nfds, int _timeout)); 104 __END_DECLS 105 106 #endif /* !_KERNEL */ 107 108 #endif /* !_SYS_POLL_H_ */ 109