If the remote stratum is higher than ours, try to lock on the peer's
polling to minimize our response time by slightly extending our delay or
waiting for the peer to catch up with us as the random part in the
actual interval is reduced. If the remote stratum is equal to ours, try
to interleave evenly with the peer.
If the remote peer uses a polling interval shorter than the local
minimum, the local peer will be unable to send any packets as the
timeout will be updated on every received valid packet and will never
expire.
Modify the delay calculation to aim at poll interval away since the last
transmit.
Also, share the delay calculation code with transmit_timeout().
- 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.
