CODEWITHSUNDEEP
c++c++11boostboost-asio
CaliopeDev
CaliopeDev

Reputation: 13

Bind boost::asio socket to new port

I haven’t yet successfully found a way to change the port of a boost asio udp socket at run time, after the initialization. Is this possible or would I have to close the socket and re-open with a completely new socket? Thanks in advance.

For some background, I initialized the socket using socket(io_service, udp::endpoint(udp::v4, port)) and then use an async_receive_from() function to receive the data.

Upvotes: 1

Views: 583

Answers (1)

sehe
sehe

Reputation: 393759

You should technically close and reopen. Your original code

socket s(ioc, udp::endpoint(udp::v4(), port));

is roughly equivalent to

socket s(ioc);
s.open(udp::v4());
s.bind(udp::endpoint(udp::v4(), port));

So, what you could do is

s.close();
s.open(udp::v4());
s.bind(udp::endpoint(udp::v4(), other_port));

As far as I remember some calls are documented to automatically close/re-open the socket if needed, but I'd rather be explicit.

Note

I'd venture that it is rarely a useful idea to re-use an IO object when the native handle isn't. See this very similar question: How to get boost::asio::acceptor to accept connections again after closing it?

In the end it's probably easier to "just" replace the entire s instance than to manage its state manually.

Upvotes: 0

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