Created
November 20, 2013 01:48
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| (require :sb-bsd-sockets) | |
| (defpackage echo-server | |
| (:use :cl :sb-bsd-sockets)) | |
| (in-package echo-server) | |
| (defvar *port* 7000) | |
| (defun make-echoer (stream id disconnector) | |
| (lambda (_) | |
| (declare (ignore _)) | |
| (handler-case | |
| (let ((line (read-line stream))) | |
| (setf line (subseq line 0 (1- (length line)))) | |
| (cond ((string= line "quit") | |
| (funcall disconnector)) | |
| (t | |
| (format t "~a: ~a~%" id line) | |
| (format stream "~a: ~a~%" id line) | |
| (force-output stream)))) | |
| (end-of-file () | |
| (funcall disconnector))))) | |
| (defun make-disconnector (socket id) | |
| (lambda () | |
| (let ((fd (socket-file-descriptor socket))) | |
| (format t "~a: closing~%" id) | |
| (sb-impl::invalidate-descriptor fd) | |
| (socket-close socket)))) | |
| (defun serve (socket id) | |
| (let ((stream (socket-make-stream socket :output t :input t)) | |
| (fd (socket-file-descriptor socket))) | |
| (sb-impl::add-fd-handler fd | |
| :input | |
| (make-echoer stream | |
| id | |
| (make-disconnector socket id))))) | |
| (defun echo-server (&optional (port *port*)) | |
| (let ((socket (make-instance 'inet-socket :type :stream :protocol :tcp)) | |
| (counter 0)) | |
| (socket-bind socket #(127 0 0 1) port) | |
| (socket-listen socket 5) | |
| (sb-impl::add-fd-handler (socket-file-descriptor socket) | |
| :input | |
| (lambda (_) | |
| (declare (ignore _)) | |
| (incf counter) | |
| (format t "Accepted client ~A~%" counter) | |
| (serve (socket-accept socket) counter))))) | |
| #+sb-thread | |
| (sb-thread:make-thread (lambda () | |
| (echo-server) | |
| (loop | |
| (sb-impl::serve-all-events)))) | |
| #-sb-thread | |
| (echo-server) |
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