[SLL] determine current limits for running process?

[Jeremy C. Reed]

How can I find out the current resource limits for a running process?

I tried looking under my /proc file system per a PID but didn't see what I 
am looking for?

I tried on 2.6.16.13 but need to know how on 2.4.21 kernel.

This is how I do it on NetBSD:

$ sudo sysctl proc.114.rlimit.descriptors
proc.114.rlimit.descriptors.soft = 64
proc.114.rlimit.descriptors.hard = 1772

Any clues for Linux would be great.

I already know how to run limit or ulimit -a in a shell to see what its 
limits are, but I am also looking at already running processes that do 
have capability to attempt to change their own resource limits.