/* Copyright (C) 1997-2018 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.  */

#if defined __USE_XOPEN || defined __USE_XOPEN2K8

/* 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	0x1000

# 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.  */