Linux 2.6 - man page for adjtime (linux section 2)
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ADJTIME(2) Linux Programmer's Manual ADJTIME(2)
adjtime - smoothly tune kernel clock
int adjtime(const struct timeval *delta, struct timeval *olddelta);
This function speeds up or slows down the system clock in order to make a gradual adjust-
ment. This ensures that the calendar time reported by the system clock is always monoton-
ically increasing, which might not happen if you simply set the clock.
The delta argument specifies a relative adjustment to be made to the clock time. If nega-
tive, the system clock is slowed down fora while until it has lost this much elapsed time.
If positive, the system clock is speeded up for a while.
If the olddelta argument is not a null pointer, the adjtime function returns information
about any previous time adjustment that has not yet completed.
This function is typically used to synchronize the clocks of computers in a local network.
You must be a privileged user to use it.
The adjtime function returns 0 on success and -1 on failure and sets the external variable
EPERM The calling process does not have enough privileges to access the clock.
With a Linux kernel, you can use the adjtimex(2) function to permanently change the system
This function is derived from 4.3 BSD and SVr4.
Linux 2.0 2002-02-16 ADJTIME(2)
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