gistfile1.txt

require 'socket'
include Socket::Constants

def can_connect?(addr, port, timeout=2)
  t = Socket.new(AF_INET, SOCK_STREAM, 0)
  saddr = Socket.pack_sockaddr_in(port, addr)
  connected = false

  begin
    t.connect_nonblock(saddr)    
  rescue Errno::EINPROGRESS
    IO::select(nil,[t],nil,timeout)
    begin
      t.connect_nonblock(saddr)
    rescue Errno::EISCONN
      t.close
      connected = true
    rescue SystemCallError
    end
  rescue SystemCallError
  end

  connected
end