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From: Keith Owens <kaos@ocs.com.au>
To: "Antti Halonen" <antti.halonen@secgo.com>
cc: "linux-os (Dick Johnson)" <linux-os@analogic.com>,
       "Linux kernel" <linux-kernel@vger.kernel.org>
Subject: Re: searching exported symbols from modules 
In-reply-to: Your message of "Wed, 19 Apr 2006 16:08:37 +0300."
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Date: Fri, 21 Apr 2006 17:33:07 +1000
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"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.