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/*
* Copyright (C) 2018 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
/******************************************************************************/
/******************************************************************************/
/* IMPLEMENTATION OF EPOLL HELPER */
/******************************************************************************/
/******************************************************************************/
/** structure for using epoll easily */
typedef struct pollitem pollitem_t;
/**
* Structure for using epoll easily
*/
struct pollitem
{
/** callback on event */
void (*handler)(pollitem_t *pollitem, uint32_t events, int pollfd);
/** data of any kind free to use */
void *closure;
/** file descriptor */
int fd;
};
/**
* Add a pollitem to epoll
*
* @param pollitem the pollitem to add
* @param events expected events
* @param pollfd file descriptor of the epoll
* @return 0 on success or -1 with errno set accordingly to epoll_ctl
*/
extern
int
pollitem_add(
pollitem_t *pollitem,
uint32_t events,
int pollfd
);
/**
* Modify a pollitem of epoll
*
* @param pollitem the pollitem to modify
* @param events expected events
* @param pollfd file descriptor of the epoll
* @return 0 on success or -1 with errno set accordingly to epoll_ctl
*/
extern
int
pollitem_mod(
pollitem_t *pollitem,
uint32_t events,
int pollfd
);
/**
* Delete a pollitem from epoll
*
* @param pollitem the pollitem to delete
* @param pollfd file descriptor of the epoll
* @return 0 on success or -1 with errno set accordingly to epoll_ctl
*/
extern
int
pollitem_del(
pollitem_t *pollitem,
int pollfd
);
/**
* Wait one event on epoll and dispatch it to its pollitem callback
*
* @param pollfd file descriptor of the epoll
* @param timeout time to wait
* @return 0 on timeout
* 1 if a callback was called
* -1 with errno set accordingly to epoll_wait
*/
extern
int
pollitem_wait_dispatch(
int pollfd,
int timeout
);
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