clock

   Determines the CPU time (in 10-millisecond units) used since the
   beginning of the process. The time reported is the sum of the
   user and system times of the calling process and any terminated
   child processes for which the calling process has executed wait
   or system.

   Format

     #include  <time.h>

     clock_t clock  (void);
 

Additional information available:

Description     Return_Values