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

static const char *v_STRING;

static int send_ping(void *bus_ptr)
{
	DBusConnection *bus = bus_ptr;
	DBusMessage *message;
	struct timespec tx_time;
	struct timespec done_time;

	message = dbus_message_new_signal("/de/linutronix/Ping",
					  "de.linutronix.Ping", "Ping");
	/* Append the string to the signal */
	dbus_message_append_args(message,
				 DBUS_TYPE_STRING, &v_STRING,
				 DBUS_TYPE_INVALID);

	clock_gettime(CLOCK_MONOTONIC, &tx_time);

	/* Send the signal */
	dbus_connection_send(bus, message, NULL);

	clock_gettime(CLOCK_MONOTONIC, &done_time);

	g_print("%ld.%06ld: ping sent: %d bytes (%ldus)\n",
		tx_time.tv_sec, tx_time.tv_nsec / 1000, strlen(v_STRING) + 1,
		((done_time.tv_sec - tx_time.tv_sec) * 1000000) +
		(done_time.tv_nsec / 1000) - (tx_time.tv_nsec / 1000));

	/* Free the signal now we have finished with it */
	dbus_message_unref(message);

	/* Return TRUE to tell the event loop we want to be called again */
	return TRUE;
}

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

	if (argc > 1) {
		int val = atoi(argv[1]);
		char *s;
		if (val < 1)
			val = 1;
		s = malloc(val);
		memset(s, '#', val);
		s[val - 1] = 0;
		v_STRING = s;
	} else {
		v_STRING = "default message";
	}

	/* Create a new event loop to run in */
	loop = g_main_loop_new(NULL, FALSE);

	/* Get a connection to the session bus */
	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;
	}

	/* Set up this connection to work in a GLib event loop */
	dbus_connection_setup_with_g_main(bus, NULL);

	/* Every second call send_ping() with the bus as an argument */
	g_timeout_add(1000, send_ping, bus);

	/* Start the event loop */
	g_main_loop_run(loop);

	return 0;
}