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/*
* Copyright (C) 2015-2020 "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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#define FDEV_PROVIDER
#include "fdev.h"
struct fdev
{
int fd;
uint32_t events;
unsigned refcount;
struct fdev_itf *itf;
void *closure_itf;
void (*callback)(void*,uint32_t,struct fdev*);
void *closure_callback;
};
struct fdev *fdev_create(int fd)
{
struct fdev *fdev;
fdev = calloc(1, sizeof *fdev);
if (!fdev)
errno = ENOMEM;
else {
fdev->fd = fd;
fdev->refcount = 3; /* set autoclose by default */
}
return fdev;
}
void fdev_set_itf(struct fdev *fdev, struct fdev_itf *itf, void *closure_itf)
{
fdev->itf = itf;
fdev->closure_itf = closure_itf;
}
void fdev_dispatch(struct fdev *fdev, uint32_t events)
{
if (fdev->callback)
fdev->callback(fdev->closure_callback, events, fdev);
}
struct fdev *fdev_addref(struct fdev *fdev)
{
if (fdev)
__atomic_add_fetch(&fdev->refcount, 2, __ATOMIC_RELAXED);
return fdev;
}
void fdev_unref(struct fdev *fdev)
{
if (fdev && __atomic_sub_fetch(&fdev->refcount, 2, __ATOMIC_RELAXED) <= 1) {
if (fdev->itf) {
fdev->itf->disable(fdev->closure_itf, fdev);
if (fdev->itf->unref)
fdev->itf->unref(fdev->closure_itf);
}
if (fdev->refcount)
close(fdev->fd);
free(fdev);
}
}
int fdev_fd(const struct fdev *fdev)
{
return fdev->fd;
}
uint32_t fdev_events(const struct fdev *fdev)
{
return fdev->events;
}
int fdev_autoclose(const struct fdev *fdev)
{
return 1 & fdev->refcount;
}
static inline int is_active(struct fdev *fdev)
{
return !!fdev->callback;
}
static inline void update_activity(struct fdev *fdev, int old_active)
{
if (is_active(fdev)) {
if (!old_active)
fdev->itf->enable(fdev->closure_itf, fdev);
} else {
if (old_active)
fdev->itf->disable(fdev->closure_itf, fdev);
}
}
void fdev_set_callback(struct fdev *fdev, void (*callback)(void*,uint32_t,struct fdev*), void *closure)
{
int oa;
oa = is_active(fdev);
fdev->callback = callback;
fdev->closure_callback = closure;
update_activity(fdev, oa);
}
void fdev_set_events(struct fdev *fdev, uint32_t events)
{
if (events != fdev->events) {
fdev->events = events;
if (is_active(fdev))
fdev->itf->update(fdev->closure_itf, fdev);
}
}
void fdev_set_autoclose(struct fdev *fdev, int autoclose)
{
if (autoclose)
fdev->refcount |= (unsigned)1;
else
fdev->refcount &= ~(unsigned)1;
}
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