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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: errno (was Re: C23 thoughts and opinions - why so conservative?)
Date: Sun, 26 May 2024 18:12:17 +0200
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On 26/05/2024 16:48, BGB wrote:
> On 5/26/2024 9:18 AM, David Brown wrote:
>> On 26/05/2024 01:45, Keith Thompson wrote:
>>> David Brown <david.brown@hesbynett.no> writes:
>>> [...]
>>>> The normal way for multi-threaded systems is to implement it as a
>>>> macro.   It might be, for example :
>>>>
>>>>     #define errno __thread_data->_errno
>>>>
>>>> or
>>>>
>>>>     #define errno *errno()
>>>
>>> Both of those need more parentheses -- and I'm unconfortable using the
>>> same identifier for the macro and the function.
>>>
>>
>> The second example was from the footnote in the C standard's section 
>> on <errno.h>, so it can't be /that/ bad!
>>
>> But I agree with your discomfort.
>>
> 
> I would expect it to immediately explode, because AFAIK the usual 
> preprocessor behavior is to keep expanding macros in a line until there 
> is nothing left to expand.
> 
> Well, granted, it is possible I could have misinterpreted how it was 
> supposed to work and had never noticed...
> 
> 

I think you did misinterpret.  Macros in C are not recursive.  That 
stops them exploding, but also means there's a lot you can't do with the 
preprocessor.