/* Compatibility definitions for System V `poll' interface.

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Copyright (C) 1994-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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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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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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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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#ifndef _SYS_POLL_H

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#define _SYS_POLL_H 1

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#include <features.h>

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/* Get the platform dependent bits of `poll'. */

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#include <bits/poll.h>

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#ifdef __USE_GNU

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# include <bits/types/__sigset_t.h>

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# include <bits/types/struct_timespec.h>

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#endif

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/* Type used for the number of file descriptors. */

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typedef unsigned long int nfds_t;

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/* Data structure describing a polling request. */

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struct pollfd

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{

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int fd; /* File descriptor to poll. */

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short int events; /* Types of events poller cares about. */

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short int revents; /* Types of events that actually occurred. */

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};

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__BEGIN_DECLS

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/* Poll the file descriptors described by the NFDS structures starting at

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FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for

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an event to occur; if TIMEOUT is -1, block until an event occurs.

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Returns the number of file descriptors with events, zero if timed out,

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or -1 for errors.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);

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#ifdef __USE_GNU

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/* Like poll, but before waiting the threads signal mask is replaced

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with that specified in the fourth parameter. For better usability,

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the timeout value is specified using a TIMESPEC object.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int ppoll (struct pollfd *__fds, nfds_t __nfds,

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const struct timespec *__timeout,

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const __sigset_t *__ss);

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#endif

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__END_DECLS

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/* Define some inlines helping to catch common problems. */

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#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function

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# include <bits/poll2.h>

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#endif

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#endif /* sys/poll.h */

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