Function gio_sys::g_data_input_stream_read_upto_finish

pub unsafe extern fn g_data_input_stream_read_upto_finish(stream: *mut GDataInputStream,
                                                          result: *mut GAsyncResult,
                                                          length: *mut size_t,
                                                          error: *mut *mut GError)
                                                          -> *mut c_char