- (let ((handler (add-fd-handler
- (gdk:display-connection-number display)
- :input #'main-iterate-all)))
- (signal-connect display 'closed
- #'(lambda (is-error-p)
- (declare (ignore is-error-p))
- (remove-fd-handler handler))))))
+ (let ((fd (gdk:display-connection-number display)))
+ (unless (< fd 0)
+ (let ((handler (add-fd-handler
+ (gdk:display-connection-number display)
+ :input #'main-iterate-all)))
+ (signal-connect display 'closed
+ #'(lambda (is-error-p)
+ (declare (ignore is-error-p))
+ (remove-fd-handler handler))))))))