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bug#30066: 'get-bytevector-some' returns only 1 byte from unbuffered por

From: Ludovic Courtès
Subject: bug#30066: 'get-bytevector-some' returns only 1 byte from unbuffered ports
Date: Fri, 16 Feb 2018 14:19:50 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

address@hidden (Ludovic Courtès) skribis:

> Andy Wingo <address@hidden> skribis:
>> On Fri 12 Jan 2018 11:15, address@hidden (Ludovic Courtès) writes:
>>> Andy Wingo <address@hidden> skribis:
>>>> On Thu 11 Jan 2018 22:55, Mark H Weaver <address@hidden> writes:
>>> [...]
>>>>>>> Out of curiosity, is there a reason why you're using an unbuffered port
>>>>>>> in your use case?
>>>>>> It’s to implement redirect à la socat:
>>>>>> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=17af5d51de7c40756a4a39d336f81681de2ba447
>>>>> Why is an unbuffered port being used here?  Can we change it to a
>>>>> buffered port?
>>>> This was also a question I had!  If you make it a buffered port at 4096
>>>> bytes (for example), then get-bytevector-some works exactly like you
>>>> want it to, no?
>>> It might work, but that’s more by chance no?
>> No, it is reliable.  get-bytevector-some on a buffered port must either
>> return all the buffered bytes or perform exactly one read (up to the
>> buffer size) and either return those bytes or EOF.  As far as I
>> understand, that is exactly what you want.
> Indeed, that works well, thanks!  So, after all, problem solved?

I’m closing this as not-a-bug.


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