# File lib/webrick/utils.rb, line 59
    def create_listeners(address, port, logger=nil)
      unless port
        raise ArgumentError, "must specify port"
      end
      res = Socket::getaddrinfo(address, port,
                                Socket::AF_UNSPEC,   # address family
                                Socket::SOCK_STREAM, # socket type
                                0,                   # protocol
                                Socket::AI_PASSIVE)  # flag
      last_error = nil
      sockets = []
      res.each{|ai|
        begin
          logger.debug("TCPServer.new(#{ai[3]}, #{port})") if logger
          sock = TCPServer.new(ai[3], port)
          port = sock.addr[1] if port == 0
          Utils::set_close_on_exec(sock)
          sockets << sock
        rescue => ex
          logger.warn("TCPServer Error: #{ex}") if logger
          last_error  = ex
        end
      }
      raise last_error if sockets.empty?
      return sockets
    end