|
System
Variables
|
Name
|
Procedure
|
Leap
Indicator
|
sys.leap
|
clock
update
|
Stratum
|
sys.stratum
|
clock
update
|
Precision
|
sys.precision
|
system
|
Root
Delay
|
sys.rootdelay
|
clock
update
|
Root
Dispersion
|
sys.rootdispersion
|
clock
update
|
Reference Clock
Ident
|
sys.refid
|
clock
update
|
Reference
Timestamp
|
sys.reftime
|
clock
update
|
Local
Clock
|
sys.clock
|
clock
update
|
Clock
Source
|
sys.peer
|
selection
|
Poll
Interval
|
sys.poll
|
local
clock
|
Cryptographic
Keys
|
sys.keys
|
authentication
|
|
|
Table 1. System Variables
|
Table 1 shows the complete set of system variables. In addition to the common variables described previously, the following variables
are used by the operating system in order to synchronize the local clock.
Local Clock (sys.clock): This is the current local time, in timestamp format. Local time is derived from the hardware clock of the
particular machine and increments at intervals depending on the design used. An
appropriate design, including slewing and skew-Compensation mechanisms, is described in Section 5.
Clock Source (sys.peer): This is a selector identifying the current synchronization source. Usually this will be a pointer to a
structure containing the peer variables. The special value NULL indicates there is
no currently valid synchronization source.
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