Re: searching exported symbols from modules

[linux-os (Dick Johnson)]

On Wed, 19 Apr 2006, Antti Halonen wrote:

>
> Hi,
>
> Apologies if I posted this question to wrong place.
>
> Here's the thing: when loading my module 'a', I want to search modules
> list to check if module 'b' is presents, and if it is, initialize my
> function pointers to the functions module b has exported. Or at least
> search symbols from module b, whatever. The main question is; how to
> locate modules by name from my module a?
>

`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`.

> Is this doable? Can anyone give me pointers?
>
> Sorry for posting such a stupid question, but I didn't run into
> satisfactory when searching the archive & many of the functions which
> would have resolved this are apparently not exported anymore.
>

If you are accessing functions or other objects that are not exported
anymore, how do you know that they even exist? You can search through
System.map to see if they are still global, but they might not be
the same size or type as before, or functions might take different
parameters.

You need to have built your modules using the current kernel headers
of the target OS version, using the current procedures (yes there are
some cheats that can be used), so that the current tools (like insmod
and modprobe) can properly handle your module.

> Any comments are really appreciated!
>
> Thanking in advance,
> antti
>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.53 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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