From: Vernon Mauery <vernux@us.ibm.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: "Antti Halonen" <antti.halonen@secgo.com>,
"linux-os (Dick Johnson)" <linux-os@analogic.com>,
"Linux kernel" <linux-kernel@vger.kernel.org>
Subject: Re: searching exported symbols from modules
Date: Fri, 21 Apr 2006 07:03:07 -0700 [thread overview]
Message-ID: <200604210703.07856.vernux@us.ibm.com> (raw)
In-Reply-To: <14930.1145604787@kao2.melbourne.sgi.com>
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
next prev parent reply other threads:[~2006-04-21 14:03 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-19 13:08 searching exported symbols from modules Antti Halonen
2006-04-19 14:55 ` linux-os (Dick Johnson)
2006-04-19 15:53 ` Robin Holt
2006-04-21 7:33 ` Keith Owens
2006-04-21 14:03 ` Vernon Mauery [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-04-20 7:15 Antti Halonen
2006-04-20 8:01 ` Kyle Moffett
2006-04-20 17:00 ` Adrian Bunk
2006-04-20 6:12 Antti Halonen
2006-04-20 7:00 ` Kyle Moffett
2006-04-20 5:50 Antti Halonen
2006-04-20 5:59 ` James Morris
2006-04-19 15:59 Antti Halonen
2006-04-19 16:02 ` Arjan van de Ven
2006-04-19 15:34 Antti Halonen
2006-04-19 15:43 ` Arjan van de Ven
2006-04-19 14:54 Antti Halonen
2006-04-19 15:17 ` Arjan van de Ven
2006-04-19 12:44 Antti Halonen
2006-04-19 12:59 ` linux-os (Dick Johnson)
2006-04-19 14:55 ` Jim Cromie
2006-04-19 14:22 ` Arjan van de Ven
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