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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.
*/
/******************************************************************************/
/******************************************************************************/
/* IMPLEMENTATION OF EPOLL HELPER */
/******************************************************************************/
/******************************************************************************/
#include <stdint.h>
#include <sys/epoll.h>
#include "pollitem.h"
/**
* Wraps the call to epoll_ctl for operation 'op'
*
* @param pollitem the pollitem to process
* @param events the expected events
* @param pollfd the file descriptor for epoll
* @param op the operation to perform
* @return 0 on success or -1 with errno set accordingly to epoll_ctl
*/
static
int
pollitem_do(
pollitem_t *pollitem,
uint32_t events,
int pollfd,
int op
) {
struct epoll_event ev = { .events = events, .data.ptr = pollitem };
return epoll_ctl(pollfd, op, pollitem->fd, &ev);
}
/* see pollitem.h */
int
pollitem_add(
pollitem_t *pollitem,
uint32_t events,
int pollfd
) {
return pollitem_do(pollitem, events, pollfd, EPOLL_CTL_ADD);
}
/* see pollitem.h */
int
pollitem_mod(
pollitem_t *pollitem,
uint32_t events,
int pollfd
) {
return pollitem_do(pollitem, events, pollfd, EPOLL_CTL_MOD);
}
/* see pollitem.h */
int
pollitem_del(
pollitem_t *pollitem,
int pollfd
) {
return pollitem_do(pollitem, 0, pollfd, EPOLL_CTL_DEL);
}
/* see pollitem.h */
int
pollitem_wait_dispatch(
int pollfd,
int timeout
) {
int rc;
struct epoll_event ev;
pollitem_t *pi;
rc = epoll_wait(pollfd, &ev, 1, timeout);
if (rc == 1) {
pi = ev.data.ptr;
pi->handler(pi, ev.events, pollfd);
}
return rc;
}
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