Re: searching exported symbols from modules

[Vernon Mauery]

On Friday 21 April 2006 00:33, Keith Owens wrote:
> "Antti Halonen" (on Wed, 19 Apr 2006 16:08:37 +0300) wrote:
> >Hi Dick,
> >
> >Thanks for your response.
> >
> >> `insmod` (or modprobe) does all this automatically. Anything that's
> >> 'extern' will get resolved. You don't do anything special. You can
> >> also use `depmod` to verify that you won't have any problems loading.
> >> `man depmod`.
> >
> >Yes, I know insmod and herein the problem lies. I have a module where
> >I want to use functions provided by another module, _if_ it is present,
> >otherwise use modules internal functions.
>
> symbol_get() and symbol_put().  See include/linux/module.h.  If
> symbol_get() returns NULL then the symbol does not exist.

The trick with symbol_get is that it is marked as EXPORT_SYMBOL_GPL, so only 
GPL modules can use it.  Not that that is a bad thing though. :)

If you want all of these nice kernel features, GPL your module!

--Vernon
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