Nagios Support Forum

Ethan Galstad wrote:
> Andreas Ericsson wrote:
>> Ahoy.
>>
>> I was digging around trying to fix a bunch of compiler-warnings, and
>> noticed that pretty much every invocation of my_free() resulted in
>> about a million warnings, such as this:
>>
>> ../xdata/xrddefault.c:190: warning: dereferencing type-punned
>> pointer will break strict-aliasing rules
>>
>>
>> Considering that not a single invocation of my_free() evaluates the
>> return code of the function, a macro such as
>>
>> #define my_free(ptr) { if(ptr) { free(ptr); ptr = NULL; } }
>>
>> would do the trick, and also provide a slight performance improvement.
>>
>> Since a patch would be fairly huge, and I've kinda filled my quota
>> for huge patches for today, the following sed-script will take care
>> of the call-sites (requires sed 4.0.9 or later):
>>
>> sed -i 's/my_free[^&]*&\([^)]*\).*/my_free(\1);/' */*.c
>>
>
> Definitely a good idea. I've committed this to CVS after some manual
> massaging post-sed.
>

Thanks.

> Don't know why, but I get a SIGABRT if I don't comment out two my_free()
> statements in xdata/xodtemplate.c in the
> xodtemplate_get_inherited_string() function.
>

I'll look into it.

> For the time being I've removed them. This will cause a small, but
> one-time memory leak upon startup until the problem is fixed.
>

Also upon sighup and reloads, I take it?

I'll feel better if it gets properly fixed. Did you have some specific
test-case or backtrace for it, or should I just throw some anarchy at it
and see what pops up?

--
Andreas Ericsson [email protected]
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231





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