


      CLOCK(3C)                   (UNIX 5.0)                  CLOCK(3C)



      NAME
           clock - report CPU time used

      SYNTAX
           long clock ( )

      DESCRIPTION
           Clock returns the amount of CPU time (in microseconds) used
           since the first call to clock.  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)
           or system(3S).

           The resolution of the clock is 1 millisecond on the Bull-
           SPS9, 10 milliseconds on Western Electric 3B processors,
           16.667 milliseconds on Digital Equipment Corporation
           processors.

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

      BUGS
           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).




























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