[Olsr-dev] Loading plugin fails, undefined symbol for olsrd functions

[Henning Rogge]

Am Dienstag 23 März 2010 22:14:49 schrieb Henning Rogge:
> Am Dienstag 23 März 2010 22:03:16 schrieb Jonathan P. Chapman:
> > Hi everyone!
> > 
> > I am working on a link quality plugin with a challenge-response
> > mechanism. The HELLO packet format will be incompatible with the regular
> > (LQ-)HELLO, so I had to write my own packet parsers etc., but I tried to
> > use the existing functions where it seemed appropriate.
> > 
> > However, I am a little stuck now. I will describe my problem with the
> > create_lq_hello function below, but it appears with some other functions
> > exactly the same way:
> > 
> > Since create_lq_hello is declared and defined in the lq_packet.c file
> > only, I declared it as an extern in my lq_challenge_plugin.c file:
> > extern void create_lq_hello(struct lq_hello_message *lq_hello, struct
> > interface *outif);
> 
> Maybe you should look into the plugin loader (src/plugin_loader.c, line
> 196++). It's not that easy to call a function of a plugin (the other way
Sorry, that was in the master branch. In the stable branch you will find an 
example for using dlsym() at line 160+ in the same file.

> around is easier). The easiest way would be to use the pointer to your
> function as a parameter to set a callback.
> 
> If you want to call a function of a plugin you need the dl_handle and use
> the function dlsym() I think. But I don't know if the dl_handle is even
> available in outside the plugin loader. OLSRd is not designed to call up a
> function of a plugin except through a callback mechanism.

Henning Rogge

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