[Openmcl-devel] Read all available input from socket stream?
xach at xach.com
Wed Jul 24 07:59:24 CDT 2013
Gary Byers <gb at clozure.com> writes:
> Here's a very simple test case that tries to do something similar to
> what your code is apparently trying to do.
> (defun server ()
> (let* ((lsock (make-socket :connect :passive :local-host "localhost" :local-port 40000 :reuse-address t))
> (data (make-array 10 :element-type '(unsigned-byte 8))))
> (dotimes (i 10) (setf (aref data i) i))
> (let* ((stream (accept-connection lsock :wait t)))
> (write-sequence data stream)
> (when t
> (sleep 5)
> (write-sequence data stream))
> (close stream)
> (close lsock))))
> (defun test ()
> (process-run-function "server" #'server)
> (let* ((stream (make-socket :remote-host "localhost" :remote-port 40000))
> (data (make-array 19 :element-type '(unsigned-byte 8)))
> (n (read-sequence data stream)))
> (close stream)
> (format t "~& requested 19 octets, got ~d" n)))
> Calling (TEST) shoud pause for ~5 seconds, then report that it requested
> and go 19 octets. Does this fail for you ? If not, how does the code
> that you're dealing with differ ?
> If you change the WHEN T in #'SERVER to WHEN NIL (and wait a few minutes,
> since I'm likely not using :reuse-address correctly), the server will close
> its side of the connection after writing 10 octets; READ-SEQUENCE will see
> that the stream is at EOF after those 10 octets are read. This (EOF) is the
> only situation in which READ-SEQUENCE should return prematurely, and it's the
> only situation I'm aware of in which it does so in CCL.
Is there another function available for when you want to get the
available 10 octets immediately?
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