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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.10 interactive-stream-p | Function
  Syntax: interactive-stream-p stream generalized-boolean Arguments and Values: stream - a stream. generalized-boolean - a generalized boolean. Description: Returns true if stream is an interactive stream; otherwise, returns false. Examples:
       (when (> measured limit)
         (let ((error (round (* (- measured limit) 100)
                             limit)))
           (unless (if (interactive-stream-p *query-io*)
                       (yes-or-no-p "The frammis is out of tolerance by ~D%.~@
                                     Is it safe to proceed? " error)
                       (< error 15))  ;15% is acceptable
             (error "The frammis is out of tolerance by ~D%." error))))
Exceptional Situations: Should signal an error of type type-error if stream is not a stream. See Also: Section 21.1 Stream Concepts Allegro CL Implementation Details: See cl:interactive-stream-p implementation in implementation.html for information on the Allegro CL implementation.

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