RTEMS: cpukit/include/sys/poll.h Source File

| RTEMS 5.4-rc2

Loading...
Searching...
No Matches
poll.h
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 * $FreeBSD$
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 */
45 struct 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__BEGIN_DECLS
99int poll(struct pollfd _pfd[], nfds_t _nfds, int _timeout);
100__END_DECLS
101
102#endif /* !_KERNEL */
103
104#endif /* !_SYS_POLL_H_ */
pollfd
Definition: poll.h:45