class DEBUGGER__::UI_ServerBase

def setup_interrupt
  prev_handler = trap(TRAP_SIGNAL) do
    # $stderr.puts "trapped SIGINT"
    ThreadClient.current.on_trap TRAP_SIGNAL
    case prev_handler
    when Proc
      prev_handler.call
    else
      # ignore
    end
  end
  if sigurg_overridden?(prev_handler)
    DEBUGGER__.warn "SIGURG handler is overridden by the debugger."
  end
  yield
ensure
  trap(TRAP_SIGNAL, prev_handler)
end