clock(3C)

NAME
     clock - report CPU time used

SYNOPSIS
     #include <time.h>

     clock_t clock (void);

DESCRIPTION
     clock returns the amount of CPU time used since the first call to clock.
     The unit time of clock (microseconds) is indicated in the macro
     CLOCKS_PER_SEC found in the file <time.h>.  The time reported is the sum
     of the user and system times of the calling process and its terminated
     child processes for which it has executed wait(2), pclose(3S), or
     system(3S).

     The resolution of the clock is 10 milliseconds on IRIS workstations.

SEE ALSO
     times(2), wait(2), popen(3S), system(3S).

BUGS
     The implementation of clock conflicts with the definition of the routine
     found in the ANSI C Standard.  The discrepancy will be transparent,
     however, so long as programs which adhere to that Standard use the
     difference in two invocations of clock for timing information, as
     recommended by the Standard.

     The value returned by clock is defined in microseconds for compatibility
     with systems that have CPU clocks with much higher resolution.  Because
     of this, the value returned will wrap around after accumulating only 2147
     seconds of CPU time (about 36 minutes).