* @return XCB_CONN_CLOSED_MEM_INSUFFICIENT, when memory not available.
* @return XCB_CONN_CLOSED_REQ_LEN_EXCEED, exceeding request length that server accepts.
* @return XCB_CONN_CLOSED_PARSE_ERR, error during parsing display string.
* @return XCB_CONN_CLOSED_MEM_INSUFFICIENT, when memory not available.
* @return XCB_CONN_CLOSED_REQ_LEN_EXCEED, exceeding request length that server accepts.
* @return XCB_CONN_CLOSED_PARSE_ERR, error during parsing display string.