Function gio_2_0_sys::g_dbus_connection_signal_subscribe

pub unsafe extern "C" fn g_dbus_connection_signal_subscribe(
    connection: *mut GDBusConnection, 
    sender: *const gchar, 
    interface_name: *const gchar, 
    member: *const gchar, 
    object_path: *const gchar, 
    arg0: *const gchar, 
    flags: GDBusSignalFlags, 
    callback: GDBusSignalCallback, 
    user_data: gpointer, 
    user_data_free_func: Option<GDestroyNotify>
) -> guint