- normalize command line before parsing
- compare whole words
- check for missing/extra arguments in config parsing
- use strdup for string allocation
- share code for reporting syntax errors
- avoid using function pointers
- cleanup the code a bit
When chronyd is started with -R, the initstepslew directive and the
makestep directive with a positive limit will be ignored. This is useful
when restarting chronyd to avoid unnecessary clock adjustments. It can
be used with -r.
When there are duplicate ntp servers listed on the initstepslew line, 2
SourceRecords are created (sourceA and sourceB), and two timers are
created (timerA and timerB). When ntp responses are received, only
sourceA is updated because of the way read_from_socket searches for a
matching record. Eventually, the criteria for sourceA are met, causing
timerA to stop and n_completed_sources to increment. timerB continues
to trigger, sending ntp poll messages to the ntp server. Responses from
that server are assigned to sourceA, triggering the criteria for sourceA
and causing n_completed_sources to increment improperly. Once this
happens enough times, n_complete_sources == number of servers and all
SourceRecords are deleted. The next time timerB triggers, it attempts
to access sourceB, which was already been deleted, causing the core.
This should prevent chronyd from getting stuck and refusing new samples
due to failing test4 when the current measured frequency offset is close
to 1.0. That can happen when the system clock is stepped forward behind
chronyd's back.
leapsectz directive is used to set the name of the timezone in the
system tz database which chronyd can use to find out when will the next
leap second occur. It will periodically check if dates Jun 30 23:59:60
and Dec 31 23:59:60 are valid in that timezone. This is mainly useful
with reference clocks which don't provide the leap second information.
It is not necessary to restart chronyd if the tz database is updated
with a new leap second at least 12 hours before the event.
This directive sets the maximum allowed offset corrected on a clock
update. The check is performed only after the specified number of
updates to allow a large initial adjustment of the system clock. When
an offset larger than the specified maximum occurs, it will be ignored
for the specified number of times and then chronyd will give up
and exit (a negative value can be used to never exit). In both cases
a message is sent to syslog.
