Working With TCP Sockets by Jesse Storimer

Author:Jesse Storimer
Language: eng
Format: epub, pdf
Publisher: Jesse Storimer
Published: 2012-01-17T16:00:00+00:00

Non-blocking Connect

Think you can guess what the connect_nonblock method does by now? Then you're in for a surprise! connect_nonblock behaves a bit differently than the other non-blocking IO methods.

Whereas the other methods either complete their operation or raise an appropriate exception, connect_nonblock leaves its operation in progress and raises an exception.

If connect_nonblock cannot make an immediate connection to the remote host, then it actually lets the operation continue in the background and raises Errno::EINPROGRESS to notify us that the operation is still in progress. In the next chapter we'll see how we can be notified when this background operation completes. For now, a quick example:

# ./code/snippets/connect_nonblock.rbrequire 'socket' socket = Socket.new(:INET, :STREAM) remote_addr = Socket.pack_sockaddr_in(80, 'google.com') begin # Initiate a nonblocking connection to google.com on port 80. socket.connect_nonblock(remote_addr) rescue Errno::EINPROGRESS # Operation is in progress. rescue Errno::EALREADY # A previous nonblocking connect is already in progress. rescue Errno::ECONNREFUSED # The remote host refused our connect. end

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