Hi,

yes you are missing a very vital thing and that is EXPORT_SYMBOL.
Loadable Kernel modules are not part of kernel image and can not just
use any symbol of kernel, They can use only exported symbols either
exported through EXPORT_SYMBOL or EXPORT_SYMBOL_GPL. GPL version has
limitation that your module license should be GPL too and you have to
make it open source.

Anyways you can always write a similar function in your module:

        task_lock(tsk);
        strncpy(buf, tsk->comm, sizeof(tsk->comm));
        task_unlock(tsk);

Note that task_lock is an static inline function in sched.h so you can
safely use that.

Rajat

On Tue, Jan 11, 2011 at 11:32 AM, Hanumant Singh [off-list ref] wrote:

Hi
?? I am trying to write a simple module that sort of emulates the ps
command. I am trying to get the comm string for the task, using
get_task_comm, but the make command keeps telling me that the symbol
get_task_comm is not defined. I have included linux/sched.h. This is the
header file, which I believe has the prototype definition for the function.
Am I missing something?
Thanks
Hanumant
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