/usr/share/scsh-0.6/misc/remote.scm is in scsh-common-0.6 0.6.7-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | ; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
; This is a small mock-up of the Cornell mobile robot system.
; It is not intended as a remote procedure call mechanism.
; ,load-config =scheme48/misc/packages.scm
; ,open remote
; To start a server, do
; (define sock (make-socket))
; (serve sock)
; To start a client, do
; (remote-repl "hostname" <number>)
; where <number> is the number displayed by the server when it starts up.
; Server side
(define (note-structure-locations! s)
(define (recur name env trail)
(let ((b (generic-lookup env name)))
(if (binding? b)
(begin
(note-location! (binding-place b))
(let ((t (binding-static b)))
(if (and (transform? t) (not (member t trail)))
(let ((trail (cons t trail))
(env (transform-env t)))
(for-each (lambda (name)
(recur name env trail))
(transform-aux-names (binding-static b))))))))))
(for-each-declaration (lambda (name type)
(recur name s '()))
(structure-interface s)))
(note-structure-locations! scheme-level-2)
(define (make-socket)
(call-with-values socket-server cons))
(define (serve sock)
(let ((port-number (car sock))
(accept (cdr sock)))
(display "Port number is ")
(write port-number)
(newline)
(let ((in #f)
(out #f))
(dynamic-wind (lambda ()
(call-with-values accept
(lambda (i-port o-port)
(display "Open") (newline)
(set! in i-port)
(set! out o-port))))
(lambda ()
(start-server in out))
(lambda ()
(if in (close-input-port in))
(if out (close-output-port out)))))))
(define (start-server in out)
(let loop ()
(let ((message (restore-carefully in)))
(case (car message)
((run)
(dump (run-carefully (cdr message))
(lambda (c) (write-char c out))
-1)
(force-output out)
(loop))
((eof) (cdr message))
(else (error "unrecognized message" message))))))
(define (run-carefully template)
(call-with-current-continuation
(lambda (escape)
(with-handler
(lambda (c punt)
(if (error? c)
(escape (cons 'condition c))
(punt)))
(lambda ()
(call-with-values (lambda ()
(invoke-closure (make-closure template #f)))
(lambda vals
(cons 'values vals))))))))
; Client side
(define (make-remote-eval in out)
(lambda (form p)
(compile-and-run-forms (list form)
p
#f
(lambda (template)
(dump (cons 'run template)
(lambda (c) (write-char c out))
-1)
(force-output out)
(let ((reply (restore-carefully in)))
(case (car reply)
((values)
(apply values (cdr reply)))
((condition)
(signal-condition (cdr reply)))
((eof)
(error "eof on connection")))))
#f)))
(define (make-remote-package in out opens id)
(let ((p (make-simple-package opens
#t
(reflective-tower
(package->environment (interaction-environment)))
id)))
(set-package-evaluator! p (make-remote-eval in out))
p))
(define (remote-repl host-name socket-port-number)
(let ((in #f) (out #f))
(dynamic-wind
(lambda ()
(call-with-values (lambda ()
(socket-client host-name socket-port-number))
(lambda (i-port o-port)
(set! in i-port)
(set! out o-port))))
(lambda ()
(with-interaction-environment (make-remote-package in out (list scheme) 'remote)
(lambda () (command-loop list #f))))
(lambda ()
(if in (close-input-port in))
(if out (close-output-port out))))))
; Common auxiliary
(define (restore-carefully in)
(call-with-current-continuation
(lambda (exit)
(restore (lambda ()
(let ((c (read-char in)))
(if (eof-object? c)
(exit (cons 'eof c))
c)))))))
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