Messages in this thread | | | From | Vernon Mauery <> | Subject | Re: searching exported symbols from modules | Date | Fri, 21 Apr 2006 07:03:07 -0700 |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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