[Openmcl-devel] Two streams questions

[Ron Garret]

Yes, but I don’t want a socket.  I want to communicate with a serial device by opening /dev/device

On Jul 29, 2016, at 12:59 PM, Karsten Poeck <karsten.poeck at gmail.com> wrote:

> 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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> 
> 
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