stk/Demos/server.stk

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#!/usr/local/bin/stk -f
;;;; s e r v e r . s t k -- A simple sever
;;;;
;;;; Copyright © 1993-1996 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, and/or distribute this software and its
;;;; documentation for any purpose and without fee is hereby granted, provided
;;;; that both the above copyright notice and this permission notice appear in
;;;; all copies and derived works. Fees for distribution or use of this
;;;; software or derived works may only be charged with express written
;;;; permission of the copyright holder.
;;;; This software is provided ``as is'' without express or implied warranty.
;;;;
;;;; This software is a derivative work of other copyrighted softwares; the
;;;; copyright notices of these softwares are placed in the file COPYRIGHTS
;;;;
;;;; Author: Erick Gallesio [eg@kaolin.unice.fr]
;;;; Creation date: 4-Feb-1995 18:17
;;;; Last file update: 12-Feb-1995 11:57
(define s (make-server-socket))
(dynamic-wind
;; Init: Launch an xterm with telnet running on the s listening port and connect
(lambda ()
(run-process "xterm" "-e" "telnet" "localhost"
(number->string (socket-port-number s)))
(socket-accept-connection s)
(format (socket-output s) "\nWelcome on the socket REPL.\n\n> ")
(flush (socket-output s)))
;; Action: A toplevel like loop
(lambda ()
(let loop ()
(format (socket-output s) "; Result: ~s\n> " (eval (read (socket-input s))))
(flush (socket-output s))
(loop)))
;; Termination: We go here when
;; a) an error occurs
;; b) connection is closed
(lambda ()
(format #t "Shutdown ......\n")
(socket-shutdown s)))