Add an option to use the median filter to reduce noise in measurements
before they are accumulated to sourcestats, similarly to reference
clocks. The option specifies how many samples are reduced to a single
sample.
The filter is intended to be used with very short polling intervals in
local networks where it is acceptable to generate a lot of NTP traffic.
Move the implementation of the median filter to a separate file to make
it useful for NTP. Replace some constants with parameters and generalize
the code to work with full NTP samples (including root dispersion/delay,
stratum, and leap).
For refclocks it should give the same results as before.
This moves the leap status of the last sample from the source instance
to the sourcestats instance in order to make them both accumulate the
same data.
The current code uses macros from inttypes.h. There is no point in
detecting and selecting between stdint.h and inttypes.h as the latter is
always needed.
In chronyc handle SIGPIPE similarly to SIGTERM. In chronyd ignore the
signal to avoid crashing when a TCP socket will be needed (e.g. for
NTS-KE) and will be unexpectedly closed from the other side.
Before dispatching a handler, check if it is still valid. This allows a
handler to remove itself when a descriptor has two different events at
the same time.
When the local polling interval is adjusted between minpoll and maxpoll
to a sub-second value, check if the source is reachable and the minimum
measured delay is 10 milliseconds or less. If it's not, ignore the
maxpoll value and set the interval to 1 second.
This should prevent clients (mis)configured with an extremely short
minpoll/maxpoll from flooding servers on the Internet.
If the polling interval is shorter than 8 seconds, set the burst
interval to the 1/4th of the polling interval instead of the 2-second
constant. This should make the burst option and command useful with
very short polling intervals.
Fix mismatches between the format and sign of variables passed to
printf() or scanf(), which were found in a Frama-C analysis and gcc
using the -Wformat-signedness option.
Instead of adding the recipient to the sendmail command line (which is
interpretted by the shell) add a "To" line to the message and run
sendmail with the -t option to read the recipient from the message.
While it is not expected to happen with any time that can be represented
by the system clock, the functions are allowed to return NULL. Check the
pointer before dereferencing.
This issue was found in a Frama-C analysis.
Remove spaces from tab-completion results and now break on a space.
Tested with both readline and editline (libedit)
Incorporated Miroslav's suggestions.
This allows chronyd to remove its pidfile on exit after dropping the
root privileges in order to prevent another chronyd instance from
failing to start, e.g. due to a wrong SELinux label from chronyd -q.
Instead of counting missing responses, switch to the offline state
immediately when sendmsg() fails.
This makes the option usable with servers and networks that may drop
packets, and the effect will be consistent with the onoffline command.
