require 'socket'
mySocket = TCPSocket.new( 'www.wikibook.com', 80 )
puts'==================================='
# Returns information on this connection's peer socket as a struct 
# sockaddr packed into a string.
strinfo = mySocket.getpeername 
puts 'strinfo: '+strinfo
# Returns true if query returns numeric address not host name.
puts BasicSocket::do_not_reverse_lookup
puts'==================================='
# Returns information on s as a struct sockaddr packed into a string.
strinfo = mySocket.getsockname 
puts 'strinfo: '+strinfo
puts'==================================='
# Gets the specified socket option.
optval = mySocket.getsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR)
puts 'optval: '+optval.inspect
optval = optval.unpack "i"
puts 'optval: '+optval.inspect
optval = mySocket.getsockopt(Socket::SOL_SOCKET, Socket::SO_LINGER)
puts 'optval: '+optval.inspect
optval = optval.unpack "ii"
puts 'optval: '+optval.inspect
# Sets reverse_lookup status
BasicSocket::do_not_reverse_lookup=true
# Sets the specified socket option.
mySocket.setsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR, true)
optval = mySocket.getsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR)
puts 'optval: '+optval.inspect
optval = optval.unpack "i"
puts 'optval: '+optval.inspect
puts'==================================='
# 
mySocket.shutdown(2)  # 0 shuts down receiving, 1 sending, and 2 both.
puts 'mySocket: '+mySocket.inspect
puts'==================================='
# Returns true if query returns numeric address not host name.
puts BasicSocket::do_not_reverse_lookup
puts'==================================='