clock(3C)           (C Programming Language Utilities)            clock(3C)


   NAME
         clock - report CPU time used

   SYNOPSIS
         #include <time.h>

         clockt clock (void);

   DESCRIPTION
         clock returns the amount of CPU time (in microseconds) used since the
         first call to clock in the calling process.  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 the wait system
         call, the pclose function, or the system function.

         Dividing the value returned by clock by the constant CLOCKSPERSEC,
         defined in the time.h header file, will give the time in seconds.

         The resolution of the clock is 10 milliseconds.  computers.

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

   NOTES
         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).
         If the process time used is not available or cannot be represented,
         clock returns the value (clockt)-1.























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