[Xenomai-help] POSIX skin and dynamic libs

[Xenomai-help] POSIX skin and dynamic libs

[Jeff Webb]

I have a main program that dynamically loads shared library modules using dlopen().  I would like to create a shared library module that is able to spawn a Xenomai RT thread.  This seems  like it should be possible, but I get the following error when loading the module:

IOError: /usr/xenomai/lib/libpthread_rt.so.0: undefined symbol: __real_pthread_getschedparam

This seems to be related to the "-Wl,--wrap" linker flags.  Is there a way to get this to work?  I don't think recompiling the main program is an option, but I can add some code that gets executed before the dynamic library is loaded.

Thanks,

Jeff

Re:[Xenomai-help] POSIX skin and dynamic libs

[gilles.chanteperdrix]

---------- Debut du message initial -----------

De     : xenomai-help-bounces@domain.hid
A      : "Xenomai help" xenomai@xenomai.org
Copies :
Date   : Mon, 02 Oct 2006 18:43:40 -0500
Objet  : [Xenomai-help] POSIX skin and dynamic libs

> I have a main program that dynamically loads shared library
> modules using dlopen().  I would like to create a shared
> library module that is able to spawn a Xenomai RT thread.
>  This seems  like it should be possible, but I get the
> following error when loading the module:
>
> IOError: /usr/xenomai/lib/libpthread_rt.so.0: undefined symbol:
> __real_pthread_getschedparam
>
> This seems to be related to the "-Wl,--wrap" linker flags.  Is
> there a way to get this to work?  I don't think recompiling the
> main program is an option, but I can add some code that gets
> executed before the dynamic library is loaded.

The wrapper for __real_pthread_getschedparam is missing in
src/skins/posix/wrappers.c, try adding it.

--
                 Gilles Chanteperdrix

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Re: [Xenomai-help] POSIX skin and dynamic libs

[Jeff Webb]

gilles.chanteperdrix wrote:
>> I have a main program that dynamically loads shared library
>> modules using dlopen().  I would like to create a shared
>> library module that is able to spawn a Xenomai RT thread.
>>  This seems  like it should be possible, but I get the
>> following error when loading the module:
>>
>> IOError: /usr/xenomai/lib/libpthread_rt.so.0: undefined symbol:
>> __real_pthread_getschedparam
> 
> The wrapper for __real_pthread_getschedparam is missing in
> src/skins/posix/wrappers.c, try adding it.

That works.  Thanks, again!

-Jeff