open_server_inaddr_any

# File lib/drb/drb.rb, line 839
    def self.open_server_inaddr_any(host, port)
      infos = Socket::getaddrinfo(host, nil,
                                  Socket::AF_UNSPEC,
                                  Socket::SOCK_STREAM,
                                  0,
                                  Socket::AI_PASSIVE)
      families = Hash[*infos.collect { |af, *_| af }.uniq.zip([]).flatten]
      return TCPServer.open('0.0.0.0', port) if families.has_key?('AF_INET')
      return TCPServer.open('::', port) if families.has_key?('AF_INET6')
      return TCPServer.open(port)
    end