1 /* Copyright (C) 1997-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
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 01 /* There is data to read. */
26 #define POLLPRI 02 /* There is urgent data to read. */
27 #define POLLOUT 04 /* Writing now will not block. */
29 #if defined __USE_XOPEN || defined __USE_XOPEN2K8
30 /* These values are defined in XPG4.2 and later. */
31 # define POLLRDNORM POLLIN /* Normal data may be read. */
32 # define POLLRDBAND POLLPRI /* Priority data may be read. */
33 # define POLLWRNORM POLLOUT /* Writing now will not block. */
34 # define POLLWRBAND POLLOUT /* Priority data may be written. */
37 /* Event types always implicitly polled for. These bits need not be set in
38 `events', but they will appear in `revents' to indicate the status of
39 the file descriptor. */
40 #define POLLERR 010 /* Error condition. */
41 #define POLLHUP 020 /* Hung up. */
42 #define POLLNVAL 040 /* Invalid polling request. */