libc.info: clock

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`clock'--cumulative processor time

*Synopsis*
     #include <time.h>
     clock_t clock(void);
   *Description*
Calculates the best available approximation of the cumulative amount of
time used by your program since it started.  To convert the result into
seconds, divide by the macro `CLOCKS_PER_SEC'.
*Returns*
The amount of processor time used so far by your program, in units
defined by the machine-dependent macro `CLOCKS_PER_SEC'.  If no
measurement is available, the result is `-1'.
*Portability*
ANSI C requires `clock' and `CLOCKS_PER_SEC'.
   Supporting OS subroutine required: `times'.