--- TCPServer.new([host, ]service)
--- TCPServer.open([host, ]service)
    С³򥪡ץ󤷤ޤservice
    /etc/services(ޤNIS)ϿƤ륵
    ̾ݡֹǻꤷޤhostꤷ
    ꤷۥȤФƤ³դޤάƤΥ
    (󥿥ե)ؤ³׵դ뤳Ȥˤʤޤ

