Re: kfree(0) - ok?

From: Rene Herman
Date: Wed Aug 15 2007 - 06:02:32 EST


On 08/15/2007 11:20 AM, Jan Engelhardt wrote:

On Aug 15 2007 10:37, Rene Herman wrote:
On 08/15/2007 09:28 AM, Jan Engelhardt wrote:
On Aug 14 2007 16:21, Jason Uhlenkott wrote:
On Tue, Aug 14, 2007 at 15:55:48 -0700, Arjan van de Ven wrote:

NULL is not 0 though.

It is. Its representation isn't guaranteed to be all-bits-zero,

C guarantees that.

C guarantees what? If you're disagreeing with Jason -- he's right.

http://coding.derkeiler.com/Archive/C_CPP/comp.lang.c/2003-11/1808.html

He said the null _pointer_ isn't guaranteed to be all-bits zero. And it isn't. Read the standard or the faq.

but the constant value 0 when used in pointer context is always a
null pointer (and in fact the standard requires that NULL be
#defined as 0 or a cast thereof).

Rene.
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