Re: Re: alsalib symbol problem

[Florian Bomers <Florian.Bomers@sun.com>]

Thanks ! I guess Juergen's suggestion would be of general: a plugin should be
able to link to libasound with -lasound without the need that the plugin itself
is linked/dlopen()'ed with RTLD_GLOBAL. With increasing adoption of ALSA, we'll
see such a scenario more and more...

On the practical side - how can I solve the problem ? I can't change the way my
plugin is linked to the main app, so do I need to manually dlopen() libasound
myself with the RTLD_GLOBAL flag (and not use -lasound ??)

Thanks,
Florian


Juergen Kreileder wrote:
> 
> Paul Davis <pbd@op.net> writes:
> 
> >>Paul Davis <pbd@op.net> writes:
> >>
> >>> the problem is that libasound itself calls dlopen(), and the
> >>> initial (non-RTLD_GLOBAL) linkage hasn't put libasound's symbol
> >>> into the global namespace. hence, libasound's own dlopen'ed code
> >>> can't access libasound itself.
> >>
> >>I know, that's why I suggested to not do dlopen(NULL, ...) inside
> >>libasound (see the code from my previous mail).
> >
> > how does this help?
> 
> You don't have to use RTLD_GLOBAL when dlopening libasound.so or
> libraries linked with libasound.so anymore.
> 
>         Juergen
> 
> --
> Juergen Kreileder, Blackdown Java-Linux Team
> http://www.blackdown.org/java-linux/java2-status/
> 
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-- 
Florian Bomers
Java Sound
Java Software/Sun Microsystems, Inc.
http://java.sun.com/products/java-media/sound/


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