Function gio_sys::g_socket_client_connect_to_uri

pub unsafe extern fn g_socket_client_connect_to_uri(client: *mut GSocketClient,
                                                    uri: *const c_char,
                                                    default_port: u16,
                                                    cancellable: *mut GCancellable,
                                                    error: *mut *mut GError)
                                                    -> *mut GSocketConnection