Megatest

			(port    (tt-conn-port conn))
			;; (dbfname (tt-conn-port conn)) ;; 192.168.0.127:4242-726924:4.db
			(pid     (tt-conn-pid  conn))
			(servinf (conc areapath"/.servinfo/"host":"port"-"pid":"dbfname)))
		   (hash-table-set! (tt-conns ttdat) dbfname #f)
		   (if (file-exists? servinf)
		       (begin
			 (if (< attemptnum 3)
			     (begin
			       (thread-sleep! 0.25)
			       (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
			     (begin
			       (debug:print 0 *default-log-port* "INFO: no response from server "host":"port" for "dbfname)
			       (if (and (file-exists? servinf)
					(> (- (current-seconds)(file-modification-time servinf)) 60))
				   (begin
				     (debug:print 0 *default-log-port* "INFO: "servinf" file seems old and no ping response, removing it.")
				     (handle-exceptions
					 exn
				       #f
				       (delete-file* servinf))
				     (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
				   (begin
				     ;; start server - addressed in client-connect-to-server
				     ;; delay        - addressed in client-connect-to-server
				     ;; try again
				     (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
				   ))))
		       (begin ;; no server file, delay and try again
			 (debug:print 0 *default-log-port* "INFO: connection to server "host":"port" broken for "dbfname", but do not see servinf file "servinf)
			 (thread-sleep! 1)
			 (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))))
		 (begin ;; this case is where res is malformed. Probably should abort
		   (assert #f "FATAL: tt:handler received bad data "res)
		   ;; (debug:print 0 *default-log-port* "INFO: got corrupt data from server "host":"port", "res", for "dbfname", will try again.")

     (exn (io-error)
	  (full-err-print exn  "ERROR: i/o error")
	  (tt:backoff-incr host port)
	  #f)
     (exn (i/o net)
	  (if ping-mode
	      #f
	      (cond
	       ((>  tries-remaining 4) ;; server likely defunct
		(tt:backoff-incr host port)
		#f)
	       ((>= tries-remaining 0)
		(let* ((backoff-delay (* (- 26 tries-remaining) 0.1)))
		  (debug:print 0 *default-log-port* "WARNING: TCP overload, trying again in "backoff-delay"s.")
		  (thread-sleep! backoff-delay)
		  (tt:backoff-incr host port)
		  (retry))
		(assert #f "FATAL: Too many retries in tt:send-receive-direct"))
	       (else #f))))
     (exn ()
	  (full-err-print exn "Unhandled exception from client side.")
	  #f))))


;;======================================================================
;; server

        (dbprep-rx    (regexp "^SERVER: dbprep"))
        (dbprep-found 0)
	(bad-dat      (list #f #f #f #f #f #f logf)))
     (let ((fdat     (handle-exceptions
			 exn
		       (begin
			 ;; WARNING: this is potentially dangerous to blanket ignore the errors
			 (debug:print-info 0 *default-log-port* "Unable to get server info from "logf", exn="(condition->list exn))
			 '()) ;; no idea what went wrong, call it a bad server, return empty list
		       (with-input-from-file logf read-lines))))
       (if (null? fdat) ;; bad data, return bad-dat
	   bad-dat
	   (let loop ((inl  (car fdat))
		      (tail (cdr fdat))
		      (lnum 0))

			 (let* ((indat         (deserialize))
				(result        #f)
				(exn-result    #f)
				(stdout-result (with-output-to-string
						 (lambda ()
						   (let ((res (handle-exceptions
								  exn
								(let* ((errdat (condition->list exn)))
								  (set! exn-result errdat)
								  (debug:print 0 *default-log-port* "ERROR: handler exception, these are bad, will exit in five seconds.")
								  (pp errdat *default-log-port*)
								  ;; these are always bad, set up an exit thread
								  (thread-start! (make-thread (lambda ()
												(thread-sleep! 5)
												(exit))))
								  #f)
								(handler indat))))
						     (set! result res)))))
				(full-result (list result exn-result (if (equal? stdout-result "") #f stdout-result))))
			   (handle-exceptions
			       exn
			     (begin