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RedHat 9 (Linux i386) - man page for clock (redhat section 3)

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CLOCK(3)			    Linux Programmer's Manual				 CLOCK(3)

       clock - Determine processor time

       #include <time.h>

       clock_t clock(void);

       The clock() function returns an approximation of processor time used by the program.

       The  value returned is the CPU time used so far as a clock_t; to get the number of seconds
       used, divide by CLOCKS_PER_SEC.	If the processor time used is not available or its  value
       cannot be represented, the function returns the value (clock_t)-1.

       ANSI C.	POSIX requires that CLOCKS_PER_SEC equals 1000000 independent of the actual reso-

       The C standard allows for arbitrary values at the start of the program; subtract the value
       returned from a call to clock() at the start of the program to get maximum portability.

       Note that the time can wrap around.  On a 32bit system where CLOCKS_PER_SEC equals 1000000
       this function will return the same value approximately every 72 minutes.

       On several other implementations, the value returned by clock() also includes the times of
       any  children  whose  status  has  been	collected via wait() (or another wait-type call).
       Linux does not include the times of waited-for children in the value returned by  clock().
       The times() function, which explicitly returns (separate) information about the caller and
       its children, may be preferable.

       getrusage(2), times(2)

GNU					    2002-06-14					 CLOCK(3)
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