bug#18592: FFI should have portable access to ‘errno’

[Nala Ginrut]

Hi folks!
Here're patches (based on stable-2.0) to fix this issue according to
proposal 1.

Please review them, I'm going to write a new CFFI parser with nyacc, so
these patches is important for this plan. 

Thanks!

On Sat, 2015-01-24 at 11:33 +0100, Ludovic Courtès wrote:
> Mark H Weaver <address@hidden> skribis:
> 
> > address@hidden (Ludovic Courtès) writes:
> >
> >> Chaos Eternal <address@hidden> skribis:
> >>
> >>> Proposals to solve this bug:
> >>>
> >>> Proposal 1.
> >>>
> >>> Adding a keyword argument to pointer->procedure, if set to true, the
> >>> generated wrapper will check 'errno' immediately after ffi_call and
> >>> return the errno as second value.
> >>>
> >>> the proposed pointer->procedure maybe like this:
> >>> pointer->procedure return_type func_ptr arg_types #:return-errno

> I agree #1 is now the best option so far.
> 
> Ludo’.

0001-Add-option-to-pointer-procedure-to-return-errno-if-n.patch
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0002-updated-pointer-procedure-in-document.patch
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