way, important error messages don't get lost when talking to GDB
over a pipe. */
if (current_ui->instream != current_ui->stdin_stream
- || !input_interactive_p (current_ui))
+ || !input_interactive_p (current_ui)
+ /* Restrict queries to the main UI. */
+ || current_ui != main_ui)
{
old_chain = make_cleanup_restore_target_terminal ();