On Sun, 8 Oct 2000, Daniel Phillips wrote:
> >
> > It's not worth changing at this point, but for future reference it would
> > probably be much preferable to return the error code instead of the
> > horrible "error value through pointer access" method, which is usually
> > rather inefficient too.
>
> It would be nice if we could return a struct consisting of the error and
> result. I'm not sure if this is allowed in C now or not. It didn't
> work when I tried it with gcc: it seems to consider a struct-valued
> function to be a void-valued. Odd.
Struct returns are used by the page table handling, and it works. There
it's used for other reasons (better encapsulation and type-checking).
However, it generates reasonably efficient code only for the single-value
struct case (the case for most of the page tables out there), and the
syntax ends up being absolutely horrible for multi-values. Not worth it.
Linus
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