Function gio_sys::g_dbus_connection_signal_subscribe

pub unsafe extern fn g_dbus_connection_signal_subscribe(connection: *mut GDBusConnection,
                                                        sender: *const c_char,
                                                        interface_name: *const c_char,
                                                        member: *const c_char,
                                                        object_path: *const c_char,
                                                        arg0: *const c_char,
                                                        flags: GDBusSignalFlags,
                                                        callback: GDBusSignalCallback,
                                                        user_data: gpointer,
                                                        user_data_free_func: GDestroyNotify)
                                                        -> c_uint