NAME

clock − report CPU time used

SYNOPSIS

long clock ( )

HP-UX COMPATIBILITY

Level: HP-UX/RUN ONLY

Origin: System V

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 varies depending on the hardware and software configuration.  See HARDWARE DEPENDENCIES for the various vales. 

SEE ALSO

times(2), wait(2), system(3S). 

HARDWARE DEPENDENCIES

Series 200: The clock resolution is 20 milliseconds. 

Series 500: The clock resolution is 10 milliseconds as a default. 

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). 

Hewlett-Packard  —  last mod. May 11, 2021