Thank you very much! Will try to inhibit/swallow the respective calls when not
redirected.
—-rony
Rony G. Flatscher (mobil/e)
> Am 09.08.2022 um 19:42 schrieb Rick McGuire <object.r...@gmail.com>:
>
>
>
>
>> On Tue, Aug 9, 2022 at 1:08 PM Rony G. Flatscher <rony.flatsc...@wu.ac.at>
>> wrote:
>> Trying to understand the native APIs and their purpose for the new
>> redirecting environments. It
>> still seems to be the case that any result can be returned and assigned to
>> the RC variable.
>
> Which has always been the case for command handlers.
>
>>
>> The question is about the usage of redirected input, output and error from
>> the native side.
>>
>> Should one use e.g. ReadInput[Buffer](), WriteOutput[Buffer]() and
>> WriteError[Buffer]() only if the
>> respective redirection tests (IsRedirectionRequested() and
>> IsInputRedirected()/IsOutputRedirected()/IsErrorRedirected()) return true?
> Yes. While you don't have to, it's better to avoid the performance impact
> associated with multiple interpreter callbacks that need to acquire the
> interpreter lock. That's a pretty expensive noop.
>
>
>
>>
>> Would it be a fatal error to use e.g. Write{Error|Output}[Buffer]() although
>> Is{Error|Output}Redirected() returns false? What would happen in such a
>> case; is the operation
>> ignored or would that have any adverse side effects?
>
> The operation is ignored, but it has a non-zero cost associated with making
> the call.
>>
>> And with ReadInput[Buffer]() would it just return 0 in length if it is not
>> redirected?
> It doesn't currently, it just leaves the length unchanged. It probably
> should.
>
> Rick
>
>
>>
>> ---rony
>>
>>
>>
>>
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