1/*
2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*-
29 * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
30 * All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. The name of the author may not be used to endorse or promote products
41 * derived from this software without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 *
55 */
56
57#ifndef _SYS_POLL_H_
58#define _SYS_POLL_H_
59
60/*
61 * This file is intended to be compatible with the traditional poll.h.
62 */
63
64/*
65 * Requestable events. If poll(2) finds any of these set, they are
66 * copied to revents on return.
67 */
68#define POLLIN 0x0001 /* any readable data available */
69#define POLLPRI 0x0002 /* OOB/Urgent readable data */
70#define POLLOUT 0x0004 /* file descriptor is writeable */
71#define POLLRDNORM 0x0040 /* non-OOB/URG data available */
72#define POLLWRNORM POLLOUT /* no write type differentiation */
73#define POLLRDBAND 0x0080 /* OOB/Urgent readable data */
74#define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */
75
76/*
77 * FreeBSD extensions: polling on a regular file might return one
78 * of these events (currently only supported on local filesystems).
79 */
80#define POLLEXTEND 0x0200 /* file may have been extended */
81#define POLLATTRIB 0x0400 /* file attributes may have changed */
82#define POLLNLINK 0x0800 /* (un)link/rename may have happened */
83#define POLLWRITE 0x1000 /* file's contents may have changed */
84
85/*
86 * These events are set if they occur regardless of whether they were
87 * requested.
88 */
89#define POLLERR 0x0008 /* some poll error occurred */
90#define POLLHUP 0x0010 /* file descriptor was "hung up" */
91#define POLLNVAL 0x0020 /* requested events "invalid" */
92
93#define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
94 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
95
96struct pollfd {
97 int fd;
98 short events;
99 short revents;
100};
101
102typedef unsigned int nfds_t;
103
104#if !defined(KERNEL)
105
106#include <sys/cdefs.h>
107
108__BEGIN_DECLS
109
110/*
111 * This is defined here (instead of <poll.h>) because this is where
112 * traditional SVR4 code will look to find it.
113 */
114extern int poll(struct pollfd *, nfds_t, int) __DARWIN_ALIAS_C(poll);
115
116__END_DECLS
117
118#endif /* !KERNEL */
119
120#endif /* !_SYS_POLL_H_ */
121