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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*!
* \file fdset_epoll.h
*
* \author Marek Vavrusa <marek.vavrusa@nic.cz>
*
* \brief Wrapper for epoll I/O multiplexing.
*
* \addtogroup common_lib
* @{
*/
#ifndef _KNOTD_FDSET_EPOLL_H_
#define _KNOTD_FDSET_EPOLL_H_
#include "fdset.h"
/*!
* \brief Create new fdset.
*
* Linux epoll() backend.
*
* \retval Pointer to initialized FDSET structure if successful.
* \retval NULL on error.
*/
fdset_t *fdset_epoll_new();
/*!
* \brief Destroy FDSET.
*
* \retval 0 if successful.
* \retval -1 on error.
*/
int fdset_epoll_destroy(fdset_t * fdset);
/*!
* \brief Add file descriptor to watched set.
*
* \param fdset Target set.
* \param fd Added file descriptor.
* \param events Mask of watched events.
*
* \retval 0 if successful.
* \retval -1 on errors.
*/
int fdset_epoll_add(fdset_t *fdset, int fd, int events);
/*!
* \brief Remove file descriptor from watched set.
*
* \param fdset Target set.
* \param fd File descriptor to be removed.
*
* \retval 0 if successful.
* \retval -1 on errors.
*/
int fdset_epoll_remove(fdset_t *fdset, int fd);
/*!
* \brief Poll set for new events.
*
* \param fdset Target set.
*
* \retval Number of events if successful.
* \retval -1 on errors.
*
* \todo Timeout.
*/
int fdset_epoll_wait(fdset_t *fdset);
/*!
* \brief Set event iterator to the beginning of last polled events.
*
* \param fdset Target set.
* \param it Event iterator.
*
* \retval 0 if successful.
* \retval -1 on errors.
*/
int fdset_epoll_begin(fdset_t *fdset, fdset_it_t *it);
/*!
* \brief Set event iterator to the end of last polled events.
*
* \param fdset Target set.
* \param it Event iterator.
*
* \retval 0 if successful.
* \retval -1 on errors.
*/
int fdset_epoll_end(fdset_t *fdset, fdset_it_t *it);
/*!
* \brief Set event iterator to the next event.
*
* Event iterator fd will be set to -1 if next event doesn't exist.
*
* \param fdset Target set.
* \param it Event iterator.
*
* \retval 0 if successful.
* \retval -1 on errors.
*/
int fdset_epoll_next(fdset_t *fdset, fdset_it_t *it);
/*!
* \brief Returned name of epoll method.
*
* \retval Name if successful.
* \retval NULL if no method was loaded (shouldn't happen).
*/
const char* fdset_epoll_method();
/*! \brief Exported API. */
extern struct fdset_backend_t FDSET_EPOLL;
#endif /* _KNOTD_FDSET_EPOLL_H_ */
/*! @} */
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