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TCP and UDP
TCP has keep-alives that try to maintain the integrity or at least make sure that the other side is still listening, even if it's not receiving data yet. That's not the most portable mechanism and those packets can be filtered by intermediate firewalls. A method that I prefer is to use deadlines and go. So you can set a deadline on your connection to say that as soon as this deadline is reached, any blocking calls to read or write immediately return.