Hello,

When using boos asio async receiving, my received callback usually looks like this:

void ReceiveCB(const boost::system::error_code& error, std::size_t bytes_transferred)

{

                If (error) {

                               fprintf(stderr, “recv() failes: %s\n”, error.message().c_str());

                               return;

                }

                /* process data received */

                s.async_receive( boost::asio::buffer(…), & ReceiveCB);

}

I stop calling async_receive() as soon as I get an error. This works good for TCP sockets.

But with UDP sockets, recvfrom() can return e.g. the error ‘connection refused’ after I called sendto() to a peer machine, where no socket is (yet) bound to the destination port number. So, at least after the error ‘connection refuxed’, I’d better continue calling async_receive_from().

Are there any recommendations on how to decide, whether the receive callback function should re-initiate a receive operation after a receive error or not?

Mario Klebsch

--

Mario Klebsch                      Actia I+ME GmbH

Mario.klebsch@ime-actia.de         Dresdenstrasse 17/18
Fon: +49 531 38 701 716            38124 Braunschweig
Fax: +49 531 38 701 88            Germany