02-26-2011
Sounds like the OP wants to slow down the system clock, not keep it accurate. NTP would keep it accurate.
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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 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).
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)