jesuashok: Perhaps I should have mentioned earlier that I am working under Windows. Apparently, doing non-blocking socket IO under Windows is a little problematic, as discussed here. The polling solution does work well though and hopefully won't consume too much resources if I sleep for a short time (since I want to act immediately on incoming data) in between polls.
merlyn: I will take a look at POE and see how it can help me.
MonkE: I do understand that much more is needed for the server, but the code I posted was just a simplified exerpt from the client program. Thanks though!
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