Re: Segmentation fault using libtidy (symptoms, diagnosis, and bush medicine cure)

Matt, thanks for the excellent detective work.  Nuno, thanks for the 
dlopen() suggestion.  A similar (possibly exact) conflict was reported 
about a month ago.  I suggested re-ordering the libs in the LD_LIBRARY_PATH 
(or LIBPATH), but this might break RMagic in favor of Tidy.

So, I have a question, Matt who built your Tidy wrapper for Ruby?  Possibly 
they could use Nuno's suggestion when loading libtidy.so?

At 11:30 PM 6/25/2006 +0100, Nuno Lopes wrote:
> > It's been a long time since I did any C coding and I'm not really
> > familiar with the Unix library loading rules, especially as they
> > pertain to dynamically loading shared libraries so I'm not sure if
> > there is a rational explanation for this behaviour.
>
>Its normal, as the symbols are duplicated. Anyway, Ruby could use some of
>dlopen() flags (supported by newer glibcs) to try to avoid such problems.
>PHP uses those glibc tricks to try to avoid these problems (and there are
>many..), although miracles aren't possible, of course :)
>I would say that using RTLD_DEEPBIND in Ruby's dlopen mechanism would fix
>your problem.
>
>Anyway, thats why usually the C libraries prefix all their functions with
>the library name..
>
> > I hope this information might be useful in improving libtidy. Please
> > let me know if there is anything else I can add.
>
>The problem is: how to "fix" the problem without breaking compatibility with
>older tidy lib versions?
>
>Nuno
>
>
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Using Tomcat but need to do more? Need to support web services, security?
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