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It's a thin userland wrapper around adjtime(2). It can be used to view current pending time adjustments, and root can use it to smoothly adjust the system time. As far as I can tell, other systems don't have a userland utility for this, but it seems useful. Useful enough that I'm adding it to the lagom build so I can use it on my linux box too :)
965 B
965 B
Name
adjtime - print remaining system clock adjustment, and optionally set it
Synopsis
adjtime [options...]
Description
adjtime -s delta_seconds will smoothly adjust the system time by slowing it
down (if delta_seconds is negative) or speeding it up (if delta_seconds is
positive) by a fraction of a second. The larger delta_seconds is, the longer
this takes. If delta_seconds is set and a previous time adjustment is in
progress, the remaining adjustment is canceled. That is, if adjtime -s 1 is
called, and then adjtime -s 1 is called again later when only 0.3s of the
first adjtime call have been applied yet, the clock is adjusted by 1.3
seconds total, not by 2 seconds.
adjtime also prints the remaining system clock adjustment.
Options
-s delta_seconds,--set delta_seconds: Adjust system time bydelta_seconds. Must be superuser.
Examples
# adjtime -s 4.2
4.2
# sleep 1 && adjtime
4.1