report CPU time used
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
Dividing the value returned by clock by the constant
CLOCKS_PER_SEC (or a million), defined in the time.h
header file, will give the time in seconds.
The resolution of the clock is defined by CLK_TCK in limits.h,
and is typically 1/100 or 1/60 of a second.
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 (clock_t)-1.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004