[asterisk-dev] Can't load module

[Alessandro Carminati]

Hello Kevin,
thanks for your answer.

I spent a little more time and I found myself a solution, but not an
explaination.
I found that my symbols stay in a part of spandsp library which normally is
not linked by make utility by default.
It's still not clear to me, I found my symbols within libspandsp.so.2.0.0
which is the main SpanDSP file, but my symbols were not linked without
libspandsp-sim.so.2.0.0
I fixed all adding -lspandsp-sim in the SPANDSP_LIB of the makeopts file.
Now I can begin to test my brand new app which let me receive a FSK message.
If it is of some interest for someone, I will post the updates.

Regards.
Alessandro Carminati



On Thu, Dec 26, 2013 at 7:02 PM, Kevin Harwell <kharwell at digium.com> wrote:

> On Tue, 2013-12-24 at 22:39 +0100, Alessandro Carminati wrote:
> > Hello everyone and merry xmas!
> >
> > These winter vacation I decided to spend some time in coding.
> > I'm still far from any appreciable result, but I soon faced a problem
> > I can't even understand.
> > My goal is produce a dialplan application to encode and decode fsk
> > messages on audio channel.
> > I choosed to use SpanDSP, mainly because it is already there for FAX
> > operations.
> > After a day coding, I finally had something to test.
> > The build of the application ends without problem, but after Asterisk
> > doesn't load the module complaining that "Loader.c:423
> > load_dynamic_module: Error loading module
> > 'app_fsk.so': /usr/lib/asterisk/modules/app_fsk.so: undefined symbol:
> > preset_fsk_specs".
> > Can't understand. SpanDSP library has been loaded, and
> > res_fax_spandsp.so is also there as cli command confirm.
> > Looking at symbols exported within the library, nm confirms "000b48c0
> > D preset_fsk_specs" is there too.
> > Can somebody hints me where to look to solve this module load issue?
>
> It could have something to do with module load order.  If your module,
> app_fsk, depends on another module and that module (in this case
> res_fax_spandsp) loads after your's then the symbols your module is
> looking for won't be there...yet.  Thus your module won't load, but
> res_fax_spandsp will when it comes time for it to load later.
>
> Make sure any dependent modules load before your module.  You can
> preload them in modules.conf or in your code in the module
> info/definition section make sure your module's load priority is higher
> than the dependency's (see load_pri in struct ast_module_info in
> module.h).
>
>
> > Regards
> > Alessandro Carminati
>
>
> Hope that helps,
>
> --
> Kevin Harwell
> Digium, Inc. | Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com & http://asterisk.org
>
>
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