Last active tty

Hello,

My name is Marcelo and I am a student in computer science
facing a 
project that is getting difficult to implement.

In order to solve some of my problems I would like to get
some information.

I would like to know if it is possible in Linux to know from
user space 
which is the last active tty attached to an user i
choose(the last tty 
which had some activity in it). I will be root or some other
user which 
will have the proper privileges. I am willing to do any
combination of 
system calls and tricks.

If it is not possible to do from user space then I would
like to do it 
myself inside the kernel. I need to know where should I
start reading to 
have the knowledge required to do the changes in the kernel
(in my local 
copy of course).

I have some knowledge of the kernel and some little
experience in 
programming inside the kernel (mainly i played with the
scheduler and 
the virtual memory).

Thank you in advance,

Marcelo Taube

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