[haiku-development] Re: POSIX error code


Am 21.05.2008 um 01:42 schrieb Ingo Weinhold:



On 2008-05-21 at 01:05:51 [+0200], kaoutsis <kaoutsis@xxxxxx> wrote:

Ingo Weinhold wrote:

wrote:
Anyway, it certainly doesn't harm to try, but I have little hope that this will have any effect. If the standard maintainers consider the request, they are in a dilemma. Undoing the Issue 6 error codes change means that 
all the applications that relied on it would become non-conforming.



I agree.
I had an idea how to tackle the problem, may be good, may be bad:
The main problem is not binary compatibility. The problem is that the Be API 
requires that error codes be negative. E.g. create_sem() returns a
non-negative value (the sem_id) when successful, a negative error code
otherwise. A good deal of other functions/methods use the same strategy, and so does third party code. Making our error codes positive will break them all. 

Can't you just return -B_ERROR_CODE, with B_ERROR_CODE positive? :-)
An error code is not necessarily equivalent to the return code, and Posix can't possibly dictate return values of non-Posix APIs. I believe I saw some software adding that negation some months ago, possibly QEMU. 

Andreas

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