[Openmcl-devel] Two streams questions

[Karsten Poeck]

In my port of cl-http i see code like

(ccl:make-socket :remote-host host
                    :remote-port port
                    :type :stream
                    :connect :active
                    :format :bivalent)

This is documented in the manual.

In trac I see http://trac.clozure.com/ccl/wiki/VectorStreams as bivalent 
streams

regards

Karsten


On 29.07.16 21:22, Ron Garret wrote:
> 1.  Does CCL natively support bivalent file/device streams?  This:
>
> ? (apropos 'bivalent)
>       BIVALENT
>      :BIVALENT,  Value: :BIVALENT
> CCL::%BIVALENT-IOBLOCK-READ-U8-BYTE, Def: FUNCTION
> CCL::%BIVALENT-LOCKED-IOBLOCK-READ-U8-BYTE, Def: FUNCTION
> CCL::%BIVALENT-PRIVATE-IOBLOCK-READ-U8-BYTE, Def: FUNCTION
>
> seems to hint that it might, but it’s not mentioned in the docs.
>
> 2.  Is it possible to do the equivalent of read-char-no-hang on a binary stream?  There is no read-byte-no-hang in CL, but is it even possible to implement this at the user level?  How?
>
> The reason I ask is that I’m trying to read binary data from a serial device and it doesn’t have any way of signally EOF.  It just stops sending data.
>
> Thanks,
> rg
>
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