child socket port re-binding test

a.rb

# only way to get the child process to re-bind is to set SO_REUSEPORT on both
# the parent socket and the child socket before binding.

require "socket"

puts "in parent"
server = TCPServer.new("127.0.0.1", 4000)
server.setsockopt(:SOCKET, :REUSEPORT, true)
puts server.inspect

if fork
  Process.wait
else
  puts "in child"
  child_server = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM)
  child_server.setsockopt(:SOCKET, :REUSEPORT, true)
  child_server.bind(Socket.pack_sockaddr_in(4000, '127.0.0.1'))

  puts child_server.inspect
  exit
end

yeah that's the option i was thinking of. so to be very durable the parent would need to un-bind to allow bad children to work...