Question

I’d like to be able to write a ruby program that can restart without dropping it’s socket connections.

Answer 1

This program gets Google’s homepage and then when you pass it SIG_INT via Ctrl–C it restarts the program and reads the output of the homepage from the open socket with Google.

#!/usr/bin/ruby #simple_connector.rb require 'socket'  puts "Started."  if ARGV[0] == "restart"   sock = IO.open(ARGV[1].to_i)   puts sock.read   exit else   sock = TCPSocket.new('google.com', 80)   sock.write("GET /\n") end  Signal.trap("INT") do   puts "Restarting..."   exec("ruby simple_connector.rb restart #{sock.fileno}") end  while true   sleep 1 end