[Openmcl-devel] Open socket as file stream example for CCL?

R. Matthew Emerson rme at clozure.com
Tue Jun 22 18:47:51 PDT 2010

On Jun 22, 2010, at 4:36 PM, Harald Striepe wrote:

> Does anybody have a working example to open a socket as a file stream and read from it?

> I have spent several hours going in circles without meaningful results, and it is likely that somebody has the ten lines of code required working.

You might like to look at ccl:contrib;perryman;finger.lisp.

Here's a shorter example distilled from that file:

(defun sample-server (port)
  (with-open-socket (s :connect :passive :local-port port :reuse-address t)
      (let ((stream (accept-connection s)))
	(process-run-function "request handler" #'handle-request stream)))))

(defun handle-request (stream)
  (format stream "hello there~%")
  (close stream))

(defun sample-client (port)
  (with-open-socket (s :remote-host "" :remote-port port)
    (read-line s)))

(defun start-sample-server (port)
  (process-run-function "sample server" #'sample-server port))

To run it, do something like:

? (start-sample-server 8888)
#<PROCESS sample server(75) [Reset] #x302000A10A8D>
? (sample-client 8888)
"hello there"

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