Gets information about the current CPU usage.
This function has no parameters.
Returns a hash of strings with information about the current process CPU usage. The indices of the hash are:
ticks - the number of clock ticks that have elapsed since reboot.
utime - user time used by the current process.
stime - system time used by the current process.
cutime - user time used by current process and children.
cstime - system time used by current process and children.
This function isn't reliable to use, it may return negative values for high times.