lkml.org 
[lkml]   [2007]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Style Question
From
Date
On Sun, 2007-03-11 at 22:15 +0800, Cong WANG wrote:
[...]
> Another question is about NULL. AFAIK, in user space, using NULL is
> better than directly using 0 in C. In kernel, I know it used its own
> NULL, which may be defined as ((void*)0),

Userspace has the usually same definition.

> but it's _still_ different
> from raw zero.

It is different that "0" as such has the type "int". But this int is
automatically promoted to a "0 pointer".

> So can I say using NULL is better than 0 in kernel?

Yes, because it is immediately clear that a pointer is (or should be)
there (and not an int).
And the same holds for userspace since this is a pure C question.

Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-11 15:25    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site