poll.h revision 331722
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: stable/11/sys/sys/poll.h 331722 2018-03-29 02:50:57Z eadler $ 29 */ 30 31#ifndef _SYS_POLL_H_ 32#define _SYS_POLL_H_ 33 34#include <sys/cdefs.h> 35 36/* 37 * This file is intended to be compatible with the traditional poll.h. 38 */ 39 40typedef unsigned int nfds_t; 41 42/* 43 * This structure is passed as an array to poll(2). 44 */ 45struct pollfd { 46 int fd; /* which file descriptor to poll */ 47 short events; /* events we are interested in */ 48 short revents; /* events found on return */ 49}; 50 51/* 52 * Requestable events. If poll(2) finds any of these set, they are 53 * copied to revents on return. 54 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI 55 * and POLLRDBAND since none of the file types have distinct priority 56 * bands - and only some have an urgent "mode". 57 * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV 58 * POLLIN includes all of normal, band and urgent data. Most poll handlers 59 * on FreeBSD only treat it as "normal" data. 60 */ 61#define POLLIN 0x0001 /* any readable data available */ 62#define POLLPRI 0x0002 /* OOB/Urgent readable data */ 63#define POLLOUT 0x0004 /* file descriptor is writeable */ 64#define POLLRDNORM 0x0040 /* non-OOB/URG data available */ 65#define POLLWRNORM POLLOUT /* no write type differentiation */ 66#define POLLRDBAND 0x0080 /* OOB/Urgent readable data */ 67#define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */ 68 69#if __BSD_VISIBLE 70/* General FreeBSD extension (currently only supported for sockets): */ 71#define POLLINIGNEOF 0x2000 /* like POLLIN, except ignore EOF */ 72#endif 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#if __BSD_VISIBLE 83 84#define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\ 85 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL) 86 87/* 88 * Request that poll() wait forever. 89 * XXX in SYSV, this is defined in stropts.h, which is not included 90 * by poll.h. 91 */ 92#define INFTIM (-1) 93 94#endif 95 96#ifndef _KERNEL 97 98#if __BSD_VISIBLE 99#include <sys/_types.h> 100 101#include <sys/_sigset.h> 102#include <sys/timespec.h> 103 104#ifndef _SIGSET_T_DECLARED 105#define _SIGSET_T_DECLARED 106typedef __sigset_t sigset_t; 107#endif 108 109#endif 110 111__BEGIN_DECLS 112int poll(struct pollfd _pfd[], nfds_t _nfds, int _timeout); 113#if __BSD_VISIBLE 114int ppoll(struct pollfd _pfd[], nfds_t _nfds, 115 const struct timespec *__restrict _timeout, 116 const sigset_t *__restrict _newsigmask); 117#endif 118__END_DECLS 119 120#endif /* !_KERNEL */ 121 122#endif /* !_SYS_POLL_H_ */ 123