svn commit: r216101 - head/sys/netinet

Bruce Evans brde at
Thu Dec 2 09:03:11 UTC 2010

On Thu, 2 Dec 2010, Lawrence Stewart wrote:

> On 12/02/10 14:45, Bruce Evans wrote:
>> On Thu, 2 Dec 2010, Lawrence Stewart wrote:
>>> Log:
>>>  Pass NULL instead of 0 for the th pointer value. NULL != 0 on all
>>> platforms.
>> ...
>> The last case is essentially what applies in function calls.  Now the
>> conversion of either NULL or 0 or any other null pointer constant to a
>> null pointer is done according to the prototype.  The results are not
>> necessarily the same like I said above, but they compare the same.
>> Thus spelling the null pointer constant as 0 made no difference to
>> the higher-level results on any platform (unless you do something like
>> memcmp of null pointers, and use an exotic platform where null pointers
>> have different representations).  It was just a style bug.
> hmm, thanks for the informative response. I'm not sure where I got it in
> my head that NULL != 0 on all platforms, but you've now corrected that
> bit of misunderstanding. For the record, the now known to be bogus
> commit log was my own creation based on my (mis)understanding and did
> not come from David.
> When it comes time to MFC, should I use the bogus log message or correct
> it to something like:
> "Fix a minor style nit by passing NULL instead of 0 for the th pointer
> value."



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