2 * Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 1.6 2004/02/25 18:38:51 joerg Exp $
36 * This file is intended to be compatible with the traditional poll.h.
40 * This structure is passed as an array to poll(2).
43 int fd
; /* which file descriptor to poll */
44 short events
; /* events we are interested in */
45 short revents
; /* events found on return */
49 * Requestable events. If poll(2) finds any of these set, they are
50 * copied to revents on return.
51 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
52 * and POLLRDBAND since none of the file types have distinct priority
53 * bands - and only some have an urgent "mode".
54 * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV
55 * POLLIN includes all of normal, band and urgent data. Most poll handlers
56 * on FreeBSD only treat it as "normal" data.
58 #define POLLIN 0x0001 /* any readable data available */
59 #define POLLPRI 0x0002 /* OOB/Urgent readable data */
60 #define POLLOUT 0x0004 /* file descriptor is writeable */
61 #define POLLRDNORM 0x0040 /* non-OOB/URG data available */
62 #define POLLWRNORM POLLOUT /* no write type differentiation */
63 #define POLLRDBAND 0x0080 /* OOB/Urgent readable data */
64 #define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */
69 #define POLLINIGNEOF 0x2000 /* POLLIN, except ignore EOF */
72 * FreeBSD extensions: polling on a regular file might return one
73 * of these events (currently only supported on UFS).
75 #define POLLEXTEND 0x0200 /* file may have been extended */
76 #define POLLATTRIB 0x0400 /* file attributes may have changed */
77 #define POLLNLINK 0x0800 /* (un)link/rename may have happened */
78 #define POLLWRITE 0x1000 /* file's contents may have changed */
81 * These events are set if they occur regardless of whether they were
84 #define POLLERR 0x0008 /* some poll error occurred */
85 #define POLLHUP 0x0010 /* file descriptor was "hung up" */
86 #define POLLNVAL 0x0020 /* requested events "invalid" */
88 #define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
89 POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
92 * Request that poll() wait forever.
93 * XXX in SYSV, this is defined in stropts.h, which is not included
100 #include <sys/cdefs.h>
104 * XXX logically, poll() should be declared in <poll.h>, but SVR4 at
105 * least has it here in <sys/poll.h>.
106 * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the
109 int poll (struct pollfd
*, unsigned int, int);
112 #endif /* !_KERNEL */
114 #endif /* !_SYS_POLL_H_ */