#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>
#include <time.h>
#include <string.h>

static DBusHandlerResult signal_filter(DBusConnection *connection,
				       DBusMessage *message, void *user_data)
{
	/* User data is the event loop we are running in */
	GMainLoop *loop = user_data;

	/* A signal from the bus saying we are about to be disconnected */
	if (dbus_message_is_signal(message, "org.freedesktop.Local",
				   "Disconnected")) {
		/* Tell the main loop to quit */
		g_main_loop_quit (loop);
		/* We have handled this message, don't pass it on */
		return DBUS_HANDLER_RESULT_HANDLED;

	} else if (dbus_message_is_signal(message, "de.linutronix.Ping",
					  "Ping")) {
		struct timespec rx_time;
		DBusError error;
		char *s;

		clock_gettime(CLOCK_MONOTONIC, &rx_time);

		dbus_error_init(&error);

		if (dbus_message_get_args(message, &error, DBUS_TYPE_STRING,
					  &s, DBUS_TYPE_INVALID)) {
			g_print("%ld.%06ld: ping received: %d bytes\n",
				rx_time.tv_sec, rx_time.tv_nsec / 1000,
				strlen(s) + 1);
		} else {
			g_print("%ld.%06ld: ping received, but error"
				" getting message: %s\n",
				rx_time.tv_sec, rx_time.tv_nsec / 1000,
				error.message);
			dbus_error_free(&error);
		}

		return DBUS_HANDLER_RESULT_HANDLED;
	}

	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

int main(int argc, char *argv[])
{
	GMainLoop *loop;
	DBusConnection *bus;
	DBusError error;

	loop = g_main_loop_new(NULL, FALSE);
	dbus_error_init(&error);
	bus = dbus_bus_get(DBUS_BUS_SESSION, &error);

	if (!bus) {
		g_warning("Failed to connect to the D-BUS daemon: %s",
			  error.message);
		dbus_error_free (&error);
		return 1;
	}

	dbus_connection_setup_with_g_main (bus, NULL);
	/* listening to messages from all objects as no path is specified */
	dbus_bus_add_match(bus,
			   "type='signal',interface='de.linutronix.Ping'",
			   &error);
	dbus_connection_add_filter(bus, signal_filter, loop, NULL);
	g_main_loop_run (loop);

	return 0;
}