This patch fixes leap second handling for the PPS refclock. Without the
patch the PPS refclock will always report LEAP_normal. But if a locked
refclock (the SHM clock in my case) does report a leap state it should
also be taken over by the PPS refclock, otherwise chrony will still use
LEAP_normal when the PPS clock is used as reference source.
The patch will copy the leap state from the refclock. In case the PPS
clock is not specifically locked to another refclock it will take over
the leap state from the local clock.
I've tested this patch by simulating a leap second through the samples
for the SHM clock, and with the patch you will see chrony properly jump
forward or backward on the leap second. Without the patch it will not do
this and the clock becomes desynchronized and no leap state is reported
upstream to other NTP clients.
Signed-off-by: Tjalling Hattink <t.hattink@fugro.nl>
When source is set as active, it's receiving reachability updates (e.g.
offline NTP sources are not active).
Also add function to count active sources.
Implement a driver which allows using PTP hardware clock (PHC) as a
reference clock. It uses the PTP_SYS_OFFSET ioctl or clock_gettime()
to measure the offset between the PTP clock and the system clock. Ten
readings are made for every driver poll and the fastest one is returned.
As PHCs are typically kept in TAI instead of UTC, it's necessary to set
the TAI/UTC offset manually by the offset option. This could be improved
by obtaining the offset automatically from the right/UTC timezone.
Add new flag to source struct to indicate when source is selectable
(packets with good headers are received) and use a reachability
register for last 8 samples instead of the reachable flag. Source
drivers now provide only reachability updates.
None of the current handlers really need it and with temperature
compensation enabled it would be necessary to undo the compensation
before passing it to the handlers.
This adds a support for receiving samples over unix domain socket.
It's a better alternative to the SHM refclock, the resolution is not
limited to microseconds and it doesn't require polling.
