#include <dbus/dbus.h>
#include <stdio.h>
int main()
{
    DBusError err;
    DBusConnection* conn;
    // initialise the errors
    dbus_error_init(&err);


    // connect to the bus
    conn = dbus_bus_get_private(DBUS_BUS_SESSION, &err);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Connection Error (%s)\n", err.message);
        dbus_error_free(&err);
    }
    if (NULL == conn) {
        printf("conn == NULL");
        exit(1);
    }

    dbus_bus_add_match(conn,
    "type='signal',interface='com.canonical.Unity.Panel.Service',member='EntryActivated'",
    &err);
    dbus_connection_flush(conn);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Match Error (%s)\n", err.message);
        exit(1);
    }


    dbus_bus_add_match(conn,
    "type='signal',interface='org.freedesktop.UPower'",
    &err);

    dbus_connection_flush(conn);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Match Error (%s)\n", err.message);
        exit(1);
    }


    DBusMessage* msg;
    printf("Running Loop\n");
    // loop listening for signals being emmitted
    while (1){
        printf("Waiting for signal... ");
        //first lets check if there is some message in the queue
        msg = dbus_connection_pop_message(conn);
        if (NULL == msg) {
            //if not lets wait for one
            dbus_connection_read_write(conn, -1);
            msg = dbus_connection_pop_message(conn);
        }
        // check if the message is a signal from the correct interface and with the correct name
        if (dbus_message_is_signal(msg, "org.freedesktop.UPower", "Sleeping")) {
            printf("Got Sleeping\n");
        }else if (dbus_message_is_signal(msg, "org.freedesktop.UPower", "Resuming")) {
            printf("Got Resuming\n");
        }else if (dbus_message_is_signal(msg, "org.freedesktop.UPower", "DeviceChanged")) {
            printf("Got DeviceChanged\n");
        }else if (dbus_message_is_signal(msg, "org.freedesktop.UPower", "Changed")) {
            printf("Got Changed\n");
        }else if (dbus_message_is_signal(msg, "com.canonical.Unity.Panel.Service", "EntryActivated")) {
            printf("Got EntryActivated\n");
        }else{
            printf("Got unknown (%s)\n", dbus_message_get_member(msg));
        }
        // free the message
        dbus_message_unref(msg);
    }

    if (conn)
      {
        dbus_connection_close(conn);
        dbus_connection_unref(conn);
        conn = NULL;
      }
      dbus_error_free (&err);
}