Re: Use enum to declare errno values

[Bill Davidsen <davidsen@tmr.com>]

Giuliano Pochini wrote:
> On 23-Nov-2005 Denis Vlasenko wrote:
> 
>>On Wednesday 23 November 2005 15:24, moreau francis wrote:
>>
>>>Hi,
>>> 
>>>I'm just wondering why not declaring errno values using enumaration ? It is 
>>>just more convenient when debuging the kernel.
>>
>>Enums are really nice substitute for integer constants instead of #defines.
>>Enums obey scope rules, #defines do not.
>>
>>However enums are not widely used because of
>>1. tradition and style
>>2. awkward syntax required:   enum { ABC = 123 };
> 
> 
> The value of an enum constant must be representable as an int. This
> is not always the case, expecially with hardware constants and bit
> masks, which may require an unsigned int.

Could you provide an example of where the ERRNO is not an integer? It 
doesn't take on bit values, nor can I spot a plcae where the value is so 
large it would overflow if signed.

See errno.h for a starting point. I do think error_t is a good idea, 
although I doubt there's an example of a type mismatch going uncaught 
without it.
-- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me