source: rtems/cpukit/libnetworking/poll.h @ b0c516b

Last change on this file since b0c516b was 39e6e65a, checked in by Joel Sherrill <joel.sherrill@…>, on Aug 19, 1998 at 9:32:28 PM

Base files

  • Property mode set to 100644
File size: 4.0 KB
Line 
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 *      $Id$
29 */
30
31#ifndef _SYS_POLL_H_
32#define _SYS_POLL_H_
33
34/*
35 * This file is intended to be compatable with the traditional poll.h.
36 */
37
38/*
39 * This structure is passed as an array to poll(2).
40 */
41struct pollfd {
42        int     fd;             /* which file descriptor to poll */
43        short   events;         /* events we are interested in */
44        short   revents;        /* events found on return */
45};
46
47/*
48 * Requestable events.  If poll(2) finds any of these set, they are
49 * copied to revents on return.
50 * XXX Note that FreeBSD doesn't make much distinction between POLLPRI
51 * and POLLRDBAND since none of the file types have distinct priority
52 * bands - and only some have an urgent "mode".
53 * XXX Note POLLIN isn't really supported in true SVSV terms.  Under SYSV
54 * POLLIN includes all of normal, band and urgent data.  Most poll handlers
55 * on FreeBSD only treat it as "normal" data.
56 */
57#define POLLIN          0x0001          /* any readable data available */
58#define POLLPRI         0x0002          /* OOB/Urgent readable data */
59#define POLLOUT         0x0004          /* file descriptor is writeable */
60#define POLLRDNORM      0x0040          /* non-OOB/URG data available */
61#define POLLWRNORM      POLLOUT         /* no write type differentiation */
62#define POLLRDBAND      0x0080          /* OOB/Urgent readable data */
63#define POLLWRBAND      0x0100          /* OOB/Urgent data can be written */
64
65/*
66 * FreeBSD extensions: polling on a regular file might return one
67 * of these events (currently only supported on UFS).
68 */
69#define POLLEXTEND      0x0200          /* file may have been extended */
70#define POLLATTRIB      0x0400          /* file attributes may have changed */
71#define POLLNLINK       0x0800          /* (un)link/rename may have happened */
72#define POLLWRITE       0x1000          /* file's contents may have changed */
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#define POLLSTANDARD    (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
83                         POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
84
85/*
86 * Request that poll() wait forever.
87 * XXX in SYSV, this is defined in stropts.h, which is not included
88 * by poll.h.
89 */
90#define INFTIM          (-1)
91
92#ifndef KERNEL
93
94#include <sys/cdefs.h>
95
96__BEGIN_DECLS
97/*
98 * XXX logically, poll() should be declared in <poll.h>, but SVR4 at
99 * least has it here in <sys/poll.h>.
100 * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the
101 * other BSDs.
102 */
103int     poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout));
104__END_DECLS
105
106#endif /* !KERNEL */
107
108#endif /* !_SYS_POLL_H_ */
Note: See TracBrowser for help on using the repository browser.