Tflush requests cancellation of a previous request. A server should cancel work on the request and respond with an Rflush message.The server should respond to a Tflush immediately and may only respond with an Rflush message. If oldtag represents an existing request, it should abort any pending work for that request and discard the tag.
of_iovec verifies a message from an I/O vector. No copying is done, and of_iovec only performs bounds checks. Modifying the underlying I/O vector will change the results when accessing message fields.