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

[Nala Ginrut]

Here's updated patch

Thanks!

On Tue, 2016-01-05 at 10:08 -0500, Mark H Weaver wrote:
> More specifically, here's what I'd suggest:
> 
> * A new, static, 'pointer_to_procedure' C function that inherits the
>   signature and body of 'scm_pointer_to_procedure' but with a new and
>   required 'return_errno' argument.  The other functions below would be
>   wrappers for this function.
> 
> * A new private 'scm_i_pointer_to_procedure_with_keywords' C function,
>   defined using SCM_DEFINE and bound to 'pointer->procedure' in Scheme,
>   that uses 'scm_c_bind_keyword_arguments' and calls
>   'pointer_to_procedure'.
> 
> * The C API function 'scm_pointer_to_procedure', which has the same
>   arguments as in Guile 2.0.11 and calls 'pointer_to_procedure' with
>   'return_errno' set to SCM_BOOL_F.
> 
> * A new C API function 'scm_pointer_to_procedure_with_errno', which is
>   identical to 'scm_pointer_to_procedure' except that it calls
>   'pointer_to_procedure' with 'return_errno' set to SCM_BOOL_T.
> 
> The only change to foreign.h would be to add a prototype for
> 'scm_pointer_to_procedure_with_errno'.
> 
> What do you think?
> 
>       Regards,
>         Mark

0001-Added-new-function-pointer-procedure-with-errno-to-r.patch
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