FreeBSD/Linux Kernel Cross Reference
sys/sys/poll.h
1 /* $NetBSD: poll.h,v 1.7 2003/04/28 23:16:29 bjh21 Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _SYS_POLL_H_
40 #define _SYS_POLL_H_
41
42 #include <sys/featuretest.h>
43
44 typedef unsigned int nfds_t;
45
46 struct pollfd {
47 int fd; /* file descriptor */
48 short events; /* events to look for */
49 short revents; /* events returned */
50 };
51
52 /*
53 * Testable events (may be specified in events field).
54 */
55 #define POLLIN 0x0001
56 #define POLLPRI 0x0002
57 #define POLLOUT 0x0004
58 #define POLLRDNORM 0x0040
59 #define POLLWRNORM POLLOUT
60 #define POLLRDBAND 0x0080
61 #define POLLWRBAND 0x0100
62
63 /*
64 * Non-testable events (may not be specified in events field).
65 */
66 #define POLLERR 0x0008
67 #define POLLHUP 0x0010
68 #define POLLNVAL 0x0020
69
70 #if defined(_NETBSD_SOURCE)
71 /*
72 * Infinite timeout value.
73 */
74 #define INFTIM -1
75 #endif
76
77 #ifndef _KERNEL
78
79 #include <sys/cdefs.h>
80
81 __BEGIN_DECLS
82 int poll __P((struct pollfd *, nfds_t, int));
83 __END_DECLS
84
85 #endif /* _KERNEL */
86
87 #endif /* !_SYS_POLL_H_ */
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