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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2012-2014 Intel Corporation. All rights reserved.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <bluetooth/bluetooth.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include "mainloop.h"
#include "util.h"
#include "io.h"
struct io {
int ref_count;
int fd;
uint32_t events;
bool close_on_destroy;
io_callback_func_t read_callback;
io_destroy_func_t read_destroy;
void *read_data;
io_callback_func_t write_callback;
io_destroy_func_t write_destroy;
void *write_data;
io_callback_func_t disconnect_callback;
io_destroy_func_t disconnect_destroy;
void *disconnect_data;
};
static struct io *io_ref(struct io *io)
{
if (!io)
return NULL;
__sync_fetch_and_add(&io->ref_count, 1);
return io;
}
static void io_unref(struct io *io)
{
if (!io)
return;
if (__sync_sub_and_fetch(&io->ref_count, 1))
return;
free(io);
}
static void io_cleanup(void *user_data)
{
struct io *io = user_data;
if (io->write_destroy)
io->write_destroy(io->write_data);
if (io->read_destroy)
io->read_destroy(io->read_data);
if (io->disconnect_destroy)
io->disconnect_destroy(io->disconnect_data);
if (io->close_on_destroy)
close(io->fd);
io->fd = -1;
}
static void io_callback(int fd, uint32_t events, void *user_data)
{
struct io *io = user_data;
io_ref(io);
if ((events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR))) {
io->read_callback = NULL;
io->write_callback = NULL;
if (!io->disconnect_callback) {
mainloop_remove_fd(io->fd);
io_unref(io);
return;
}
if (!io->disconnect_callback(io, io->disconnect_data)) {
if (io->disconnect_destroy)
io->disconnect_destroy(io->disconnect_data);
io->disconnect_callback = NULL;
io->disconnect_destroy = NULL;
io->disconnect_data = NULL;
io->events &= ~EPOLLRDHUP;
mainloop_modify_fd(io->fd, io->events);
}
}
if ((events & EPOLLIN) && io->read_callback) {
if (!io->read_callback(io, io->read_data)) {
if (io->read_destroy)
io->read_destroy(io->read_data);
io->read_callback = NULL;
io->read_destroy = NULL;
io->read_data = NULL;
io->events &= ~EPOLLIN;
mainloop_modify_fd(io->fd, io->events);
}
}
if ((events & EPOLLOUT) && io->write_callback) {
if (!io->write_callback(io, io->write_data)) {
if (io->write_destroy)
io->write_destroy(io->write_data);
io->write_callback = NULL;
io->write_destroy = NULL;
io->write_data = NULL;
io->events &= ~EPOLLOUT;
mainloop_modify_fd(io->fd, io->events);
}
}
io_unref(io);
}
struct io *io_new(int fd)
{
struct io *io;
if (fd < 0)
return NULL;
io = new0(struct io, 1);
if (!io)
return NULL;
io->fd = fd;
io->events = 0;
io->close_on_destroy = false;
if (mainloop_add_fd(io->fd, io->events, io_callback,
io, io_cleanup) < 0) {
free(io);
return NULL;
}
return io_ref(io);
}
void io_destroy(struct io *io)
{
if (!io)
return;
io->read_callback = NULL;
io->write_callback = NULL;
io->disconnect_callback = NULL;
mainloop_remove_fd(io->fd);
io_unref(io);
}
int io_get_fd(struct io *io)
{
if (!io)
return -ENOTCONN;
return io->fd;
}
bool io_set_close_on_destroy(struct io *io, bool do_close)
{
if (!io)
return false;
io->close_on_destroy = do_close;
return true;
}
bool io_set_read_handler(struct io *io, io_callback_func_t callback,
void *user_data, io_destroy_func_t destroy)
{
uint32_t events;
if (!io || io->fd < 0)
return false;
if (io->read_destroy)
io->read_destroy(io->read_data);
if (callback)
events = io->events | EPOLLIN;
else
events = io->events & ~EPOLLIN;
io->read_callback = callback;
io->read_destroy = destroy;
io->read_data = user_data;
if (events == io->events)
return true;
if (mainloop_modify_fd(io->fd, events) < 0)
return false;
io->events = events;
return true;
}
bool io_set_write_handler(struct io *io, io_callback_func_t callback,
void *user_data, io_destroy_func_t destroy)
{
uint32_t events;
if (!io || io->fd < 0)
return false;
if (io->write_destroy)
io->write_destroy(io->write_data);
if (callback)
events = io->events | EPOLLOUT;
else
events = io->events & ~EPOLLOUT;
io->write_callback = callback;
io->write_destroy = destroy;
io->write_data = user_data;
if (events == io->events)
return true;
if (mainloop_modify_fd(io->fd, events) < 0)
return false;
io->events = events;
return true;
}
bool io_set_disconnect_handler(struct io *io, io_callback_func_t callback,
void *user_data, io_destroy_func_t destroy)
{
uint32_t events;
if (!io || io->fd < 0)
return false;
if (io->disconnect_destroy)
io->disconnect_destroy(io->disconnect_data);
if (callback)
events = io->events | EPOLLRDHUP;
else
events = io->events & ~EPOLLRDHUP;
io->disconnect_callback = callback;
io->disconnect_destroy = destroy;
io->disconnect_data = user_data;
if (events == io->events)
return true;
if (mainloop_modify_fd(io->fd, events) < 0)
return false;
io->events = events;
return true;
}
ssize_t io_send(struct io *io, const struct iovec *iov, int iovcnt)
{
ssize_t ret;
if (!io || io->fd < 0)
return -ENOTCONN;
do {
ret = writev(io->fd, iov, iovcnt);
} while (ret < 0 && errno == EINTR);
if (ret < 0)
return -errno;
return ret;
}
bool io_shutdown(struct io *io)
{
if (!io || io->fd < 0)
return false;
return shutdown(io->fd, SHUT_RDWR) == 0;
}
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