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.
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.
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.