Re: execl() sentinel

Am Mittwoch, 18. Juli 2007 17:16 schrieb Alvaro Herrera:
> Peter Eisentraut wrote:
> > Am Mittwoch, 18. Juli 2007 16:16 schrieb Tom Lane:
> > > You should *not* have to inform the machine that NULL is a pointer.
> >
> > For variadic functions, that expectation is invalid, AFAIK.
>
> No, what's invalid is that using an unadorned 0 is understood as a "null
> pointer" by the compiler. That would happen in a lot of places except
> on a variadic function.
>
> However, the platform may define NULL as it wishes, and indeed in our
> c.h it is defined (conditionally) as (void *)0. If the platform had
> such a definition then it would work without issues.
>
> I assume the platform in question does something like
> #define NULL 0
> which would be silly.

I suggest that you read through <http://c-faq.com/null/>, which is at odds
with your statements.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/