Nagios Support Forum

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.

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.

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.


Ethan Galstad,
Nagios Developer
---
Email: [email protected]
Website: http://www.nagios.org





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