+ (lambda* (#:key (port #f) (pipes #f))
+ (cond (port
+ (set! server-socket (socket PF_INET SOCK_STREAM 0))
+ (setsockopt server-socket SOL_SOCKET SO_REUSEADDR 1)
+ (bind server-socket AF_INET INADDR_ANY port)
+ (listen server-socket 5))
+ (pipes
+ (set! server-pipes pipes)))
+ (cond ((not (game-running?))
+ (game-loop)))))
+
+
+ (set! clean-closed-connections
+ (lambda (conns)
+ (cond ((null? conns) '())
+ (else
+ (let* ((cli (car conns)) (sock (car cli)))
+ (cond ((port-closed? sock)
+ (clean-closed-connections (cdr conns)))
+ (else
+ (cons cli (clean-closed-connections (cdr conns))))))))))
+
+ (set! check-connections
+ (lambda ()
+ (set! clients (clean-closed-connections clients))
+ (catch #t
+ (lambda ()
+ (cond ((char-ready? server-socket)
+ (set! clients (cons (accept server-socket) clients)))))
+ (lambda (key . args) #f))))
+
+ (set! eval-from-clients
+ (lambda ()
+ (cond (server-pipes
+ (eval-from-client (car server-pipes) (cdr server-pipes))))
+ (for-each
+ (lambda (cli) (eval-from-client (car cli) (car cli)))
+ clients)))
+
+ (set! stop-server
+ (lambda ()
+ (cond (server-socket
+ (close server-socket)
+ (set! server-socket #f)))
+ (for-each (lambda (cli) (close (car cli))) clients)
+ (set! clients '()))))
+
+(define (eval-from-client rec-channel send-channel)
+ (cond ((char-ready? rec-channel)
+ (catch #t
+ (lambda ()
+ (let ((exp (read rec-channel)))
+ (cond ((eof-object? exp)
+ (close rec-channel))
+ (else
+ (let ((result (eval-string exp)))
+ (write (if (eq? result *unspecified*) "" (format #f "~a" result)) send-channel))))))
+ (lambda (key . args)
+ (let ((fmt (string-concatenate (list (cadr args) "~%")))
+ (params (caddr args)))
+ (write
+ (if params
+ (apply format (cons #f (cons fmt params)))
+ (format #f fmt))
+ send-channel))))
+ (force-output send-channel))))
+
+
+(define connect-to-server #f)
+
+(define (connect-to-server client-socket hostname port)
+ (connect client-socket AF_INET (car (hostent:addr-list (gethost hostname))) port))