[ut3] Shutdown Error

[Ryan C. Gordon]

> gettimeofday() is a bad idea when it's about critical time information...
> Especially when it's about system time change.
> times() would be much more accurate.

There was a reason we didn't use times(), but I can't remember why 
now...it was either it didn't exist in glibc at the time, or it was just 
simply unreliable.

I also have a suspicion that it's going to be built on rdtsc when I go 
to explore it.

--ryan.