From: Derek Smith <derekbellnersmith@...>
Date: 2010-04-01T10:34:33+09:00
Subject: socket programming...lsof?

Hi All,

Is there a ruby substitute for lsof's functionality?  Meaning I want to
listen on certain ports/sockets such as identd's port 113 to see if any
process is using this port.  Is this possible in Ruby w/out using lsof?

Here is my test code, on my ubuntu personal laptop with a port from
netstat -a.

#!/usr/bin/ruby -w

require 'rubygems'
require 'socket'

#TCPSocket.open('localhost', '34814') do |socket|
#    socket.puts "gibberish"
#    socket.each_line do |line|
#        p line
#    end
#end

require 'socket'

host = 'localhost'
port = 47408

s = TCPSocket.open(host, port)

while line = s.gets
  puts line.chop
end
s.close

In both cases, I get the error:

derek@vaio-ubuntu:~$ sudo ruby  port_tst.rb
port_tst.rb:18:in `initialize': Connection refused - connect(2)
(Errno::ECONNREFUSED)
  from port_tst.rb:18:in `open'
  from port_tst.rb:18


thank you!
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