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Modified snippet from the echo server code example in http://tomayko.com/writings/unicorn-is-unix

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echo_server_snippet.rb
Ruby
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# Minor modification on line 8 of the echo server example to
# avoid IPv4/IPv6 discrepancies when resolving 'localhost' on
# some systems, such as Mac OS X 10.6.
 
acceptor = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
# Passing 'localhost' below breaks when it resolves to an IPv6 address
address = Socket.pack_sockaddr_in(4242, Socket::INADDR_LOOPBACK)
acceptor.bind(address)
acceptor.listen(10)

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