How to get the user time of another running process on FreeBSD?

[Pierre-Luc Drouin]

Hi,

I would like to know how I can get the user time of another running 
process on FreeBSD? Ideally I would like to find a solution that would 
work as well on other *nix systems. So far the solutions I have found 
are specific to a given OS (format of proc filesystem, 
lock_getcpuclockid)...

Thank you!
Pierre-Luc Drouin