1/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_POLL_H
19# error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
20#endif
21
22/* Event types that can be polled for. These bits may be set in `events'
23 to indicate the interesting event types; they will appear in `revents'
24 to indicate the status of the file descriptor. */
25#define POLLIN 0x001 /* There is data to read. */
26#define POLLPRI 0x002 /* There is urgent data to read. */
27#define POLLOUT 0x004 /* Writing now will not block. */
28
29#if defined __USE_XOPEN || defined __USE_XOPEN2K8
30/* These values are defined in XPG4.2. */
31# define POLLRDNORM 0x040 /* Normal data may be read. */
32# define POLLRDBAND 0x080 /* Priority data may be read. */
33# define POLLWRNORM 0x100 /* Writing now will not block. */
34# define POLLWRBAND 0x200 /* Priority data may be written. */
35#endif
36
37#ifdef __USE_GNU
38/* These are extensions for Linux. */
39# define POLLMSG 0x400
40# define POLLREMOVE 0x1000
41# define POLLRDHUP 0x2000
42#endif
43
44/* Event types always implicitly polled for. These bits need not be set in
45 `events', but they will appear in `revents' to indicate the status of
46 the file descriptor. */
47#define POLLERR 0x008 /* Error condition. */
48#define POLLHUP 0x010 /* Hung up. */
49#define POLLNVAL 0x020 /* Invalid polling request. */
50