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clock(3C)		 Standard C Library Functions		     clock(3C)

NAME
       clock - report CPU time used

SYNOPSIS
       #include <time.h>

       clock_t clock(void);

DESCRIPTION
       The  clock()  function 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(3C) function, the pclose(3C) function, or the system(3C) function.

RETURN VALUES
       Dividing	 the value returned by clock() by the constant CLOCKS_PER_SEC,
       defined in the <time.h> header, will give the time in seconds.  If  the
       process	time  used  is	not available or cannot be  represented, clock
       returns the value (clock_t) −1.

USAGE
       The value returned by clock() is defined in microseconds	 for  compati‐
       bility  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).

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       times(2), popen(3C), system(3C), wait(3C), attributes(5), standards(5)

SunOS 5.10			  24 Jul 2002			     clock(3C)
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