ulimit -t

I am running Ubuntu Linux (2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux) and it seems that the command "ulimit -t" does not work properly. I ran:

ulimit -t 1; myprogram

where 'myprogram' is an endless loop. I expected the program to be interrupted after 1 second, but it did not stop. I tried the same thing on a Linux Fedora installation and it worked as expected.

Is there some configuration that has to be set for it to work properly?

-- tsf