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- /* Copyright (C) 1997, 2001, 2006 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #ifndef _SYS_POLL_H
- # error "Never use <bits/poll.h> directly; include <sys/poll.h> instead."
- #endif
- /* Event types that can be polled for. These bits may be set in `events'
- to indicate the interesting event types; they will appear in `revents'
- to indicate the status of the file descriptor. */
- #define POLLIN 0x001 /* There is data to read. */
- #define POLLPRI 0x002 /* There is urgent data to read. */
- #define POLLOUT 0x004 /* Writing now will not block. */
- #ifdef __USE_XOPEN
- /* These values are defined in XPG4.2. */
- # define POLLRDNORM 0x040 /* Normal data may be read. */
- # define POLLRDBAND 0x080 /* Priority data may be read. */
- # define POLLWRNORM POLLOUT /* Writing now will not block. */
- # define POLLWRBAND 0x100 /* Priority data may be written. */
- #endif
- #ifdef __USE_GNU
- /* These are extensions for Linux. */
- # define POLLMSG 0x400
- # define POLLREMOVE 0x800
- # define POLLRDHUP 0x2000
- #endif
- /* Event types always implicitly polled for. These bits need not be set in
- `events', but they will appear in `revents' to indicate the status of
- the file descriptor. */
- #define POLLERR 0x008 /* Error condition. */
- #define POLLHUP 0x010 /* Hung up. */
- #define POLLNVAL 0x020 /* Invalid polling request. */
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