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