Re: routing socket rouding?

[Chuck Swiger <cswiger%mac.com@localhost>]

On Feb 17, 2012, at 9:20 PM, Mouse wrote:
> There is a macro, historically ROUNDUP defined in various .c files,
> RT_ROUNDUP in <net/route.h> in 5.1 and presumably later, which appears
> to be designed around the undocumented (even in comments) assumption
> that sizeof(long) is a power of two.
> 
> So, I'm curious: does anyone know what this macro turned into on a
> system with sizeof(long) not a power of two but with anything like the
> BSD routing socket, if such a system exists?

ROUNDUP (or ROUND_UP) macro was replaced by ALIGN on some platforms, ie:

  http://lkml.org/lkml/2007/4/1/50

There are buggy variants of it which don't work right even on LP64 platforms,
and it appears to assume 2's compliment arithmetic....

Regards,
-- 
-Chuck