Get the %CPU of a program

[shayzu]

Hi
I'm writing a monitor program, that is suppoed to calculate the %CPU of a program.

In order to do so, I call the getprocs() function, and use the
pi_ru.ru_utime -user time used
pi_ru.ru_stime -system time used.
of struct procsinfo.

The sum of the above field was compared to the value of the TIME column in the output of the ps command - and the result is absolutely different.

Could anyone tell me if the above values really hold the CPU time, or is there another way to get that information ?

Thanks

Shay