TCPSocket.open("www.ruby-lang.org",80){|sock|psock.addr#=>["AF_INET",49429,"hal","192.168.0.128"]psock.addr
TCPSocket.gethostbyname("localhost")#=>["localhost",["hal"],2,"127.0.0.1"] staticVALUEtcp_s_gethostbyname
pSocket.gethostbyname("hal")#=>["localhost",["hal"],2,"\x7F\x00\x00\x01"] staticVALUEsock_s_gethostbyname