You will obviously need to include a header file from your driver into
kernel (Alternatively, declate the function as extern in the kernel).
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of Sam Carter
Sent: Monday, November 09, 2009 3:35 PM
To: Zhu Yanhai
Cc: [email protected]
Subject: Re: Calling driver functions from kernel space
When I try to compile the kernel with my changes to readdir.c,
my function in the driver is undefined and it therefore won't compile.
This also happens after I've compiled my driver against the kernel tree
with the EXPORT_SYMBOL in place.
Any more thoughts on this?
2009/11/9 Zhu Yanhai <[email protected]>
EXPORT_SYMBOL_GPL(your func);
Then this function can be called outside.
For the second question, does this one work?
/* Search for module by name: must hold module_mutex. */
struct module *find_module(const char *name)
It's in kernel/module.c and has been exported.
Regards,
Zhu Yanhai
2009/11/8 Sam Carter <[email protected]>:
> Hi all,
>
> I have a char driver/module which compiles and loads
into the linux kernel
> just fine. In this driver are some functions which I
would like to access
> from the kernel file 'fs/readdir.c'. Additionally, how
can I test if a
> driver is loaded?
>
> I need something like the following.
>
> if(myDriver is loaded){
>
> myDriver.functionCall();
> }
>
> All examples I've found on internet searches are doing
it from userspace
> applications.
>
> Thanks for any help
>
>
