09-02-2011
Is there a time during the day, or week, where you can use a crontab to reboot the system. A reboot will bring in the correct time from the motherboard clock. You can set it up for autoboot and the only issue will be an autoboot message in mail.
In a long ago discussion on some support site there was a statement that certain things in SCO disable interrupts temporarily and cost a click of the clock. I'm not into SCO enough to trace down whether the statement is true.
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ADJTIME(2) System Calls Manual ADJTIME(2)
NAME
adjtime - correct the time to allow synchronization of the system clock
SYNOPSIS
#include <sys/time.h>
adjtime(delta, olddelta)
struct timeval *delta;
struct timeval *olddelta;
DESCRIPTION
Adjtime makes small adjustments to the system time, as returned by gettimeofday(2), advancing or retarding it by the time specified by the
timeval delta. If delta is negative, the clock is slowed down by incrementing it more slowly than normal until the correction is complete.
If delta is positive, a larger increment than normal is used. The skew used to perform the correction is generally a fraction of one per-
cent. Thus, the time is always a monotonically increasing function. A time correction from an earlier call to adjtime may not be finished
when adjtime is called again. If olddelta is non-zero, then the structure pointed to will contain, upon return, the number of microseconds
still to be corrected from the earlier call.
This call may be used by time servers that synchronize the clocks of computers in a local area network. Such time servers would slow down
the clocks of some machines and speed up the clocks of others to bring them to the average network time.
The call adjtime(2) is restricted to the super-user.
RETURN VALUE
A return value of 0 indicates that the call succeeded. A return value of -1 indicates that an error occurred, and in this case an error
code is stored in the global variable errno.
ERRORS
The following error codes may be set in errno:
[EFAULT] An argument points outside the process's allocated address space.
[EPERM] The process's effective user ID is not that of the super-user.
SEE ALSO
date(1), gettimeofday(2), timed(8), timedc(8),
TSP: The Time Synchronization Protocol for UNIX 4.3BSD, R. Gusella and S. Zatti
NOTES (PDP-11)
Adjtime(2) calls are executed immediately, not over a period of time, therefore, the olddelta return values for an adjtime(2) call will
always be zero.
4.3 Berkeley Distribution May 15, 1986 ADJTIME(2)