/*
 * Copyright (c) 2017 Digi International Inc.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 * Digi International Inc. 11001 Bren Road East, Minnetonka, MN 55343
 * =======================================================================
 */

#include <aws_iot_log.h>
#include <signal.h>
#include <unistd.h>

/*------------------------------------------------------------------------------
                    F U N C T I O N  D E C L A R A T I O N S
------------------------------------------------------------------------------*/
static int check_stop(void);
static void add_sigkill_signal(void);
static void graceful_shutdown(void);
static void sigint_handler(int signum);

/*------------------------------------------------------------------------------
                         G L O B A L  V A R I A B L E S
------------------------------------------------------------------------------*/
static volatile int stop = 0;

/*------------------------------------------------------------------------------
                     F U N C T I O N  D E F I N I T I O N S
------------------------------------------------------------------------------*/
int main(int argc, char **argv)
{
	int result = EXIT_SUCCESS;

	add_sigkill_signal();

	do {
		sleep(1);
	} while (!check_stop());

	return result;
}

/*
 * check_stop() - Stop application
 *
 * Return: 1 if it is successfully stopped, 0 otherwise.
 */
static int check_stop(void)
{
	return stop;
}

/*
 * add_sigkill_signal() - Add the kill signal to the process
 */
static void add_sigkill_signal(void)
{
	struct sigaction new_action;
	struct sigaction old_action;

	/* Setup signal hander. */
	atexit(graceful_shutdown);
	new_action.sa_handler = sigint_handler;
	sigemptyset(&new_action.sa_mask);
	new_action.sa_flags = 0;
	sigaction(SIGINT, NULL, &old_action);
	if (old_action.sa_handler != SIG_IGN)
		sigaction(SIGINT, &new_action, NULL);
}

/*
 * graceful_shutdown() - Stop MQTT connection and all threads
 */
void graceful_shutdown(void)
{
	stop = 1;
	check_stop();
}

/**
 * sigint_handler() - Manage signal received.
 *
 * @signum: Received signal.
 */
static void sigint_handler(int signum)
{
	IOT_DEBUG("Received signal %d to close Cloud connection.", signum);
	exit(0);
}