FreeBSD/Linux Kernel Cross Reference
sys/sys/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: src/sys/sys/poll.h,v 1.6.2.1 2000/08/21 12:25:58 sheldonh Exp $
29 * $DragonFly: src/sys/sys/poll.h,v 1.7 2008/01/12 06:01:27 nant Exp $
30 */
31
32 #ifndef _SYS_POLL_H_
33 #define _SYS_POLL_H_
34
35 /*
36 * This file is intended to be compatible with the traditional poll.h.
37 */
38
39 typedef unsigned int nfds_t;
40
41 /*
42 * This structure is passed as an array to poll(2).
43 */
44 struct pollfd {
45 int fd; /* which file descriptor to poll */
46 short events; /* events we are interested in */
47 short revents; /* events found on return */
48 };
49
50 /*
51 * Requestable events. If poll(2) finds any of these set, they are
52 * copied to revents on return.
53 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
54 * and POLLRDBAND since none of the file types have distinct priority
55 * bands - and only some have an urgent "mode".
56 * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV
57 * POLLIN includes all of normal, band and urgent data. Most poll handlers
58 * on FreeBSD only treat it as "normal" data.
59 */
60 #define POLLIN 0x0001 /* any readable data available */
61 #define POLLPRI 0x0002 /* OOB/Urgent readable data */
62 #define POLLOUT 0x0004 /* file descriptor is writeable */
63 #define POLLRDNORM 0x0040 /* non-OOB/URG data available */
64 #define POLLWRNORM POLLOUT /* no write type differentiation */
65 #define POLLRDBAND 0x0080 /* OOB/Urgent readable data */
66 #define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */
67
68 /*
69 * These events are set if they occur regardless of whether they were
70 * requested.
71 */
72 #define POLLERR 0x0008 /* some poll error occurred */
73 #define POLLHUP 0x0010 /* file descriptor was "hung up" */
74 #define POLLNVAL 0x0020 /* requested events "invalid" */
75
76 #define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
77 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
78
79 /*
80 * Request that poll() wait forever.
81 * XXX in SYSV, this is defined in stropts.h, which is not included
82 * by poll.h.
83 */
84 #define INFTIM (-1)
85
86 #ifndef _KERNEL
87
88 #include <sys/cdefs.h>
89
90 __BEGIN_DECLS
91 /*
92 * XXX logically, poll() should be declared in <poll.h>, but SVR4 at
93 * least has it here in <sys/poll.h>.
94 */
95 int poll (struct pollfd *, nfds_t, int);
96 __END_DECLS
97
98 #endif /* !_KERNEL */
99
100 #endif /* !_SYS_POLL_H_ */
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