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Option values may be structs. Passing them can be complex as it involves examining your system headers to determine the correct definition. An example is an ip_mreq, which may be defined in your system headers as: struct ip_mreq { struct in_addr imr_multiaddr; struct in_addr imr_interface; }; In this case #setsockopt could be called like this: optval = IPAddr.new("224.0.0.251") + Socket::INADDR_ANY sock.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, optval)

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