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New in version 4.5
==================

Enhancements
------------
* Add support for AES-GCM-SIV in GnuTLS
* Add support for corrections from PTP transparent clocks
* Add support for systemd socket activation

Bug fixes
---------
* Fix presend in interleaved mode
* Fix reloading of modified sources from sourcedir

New in version 4.4
==================

Enhancements
------------
* Add support for AES-GCM-SIV with Nettle >= 3.9 to shorten NTS
  cookies to avoid some length-specific blocking of NTP on Internet
* Add support for multiple refclocks using extpps option on one PHC
* Add maxpoll option to hwtimestamp directive to improve PHC tracking
  with low packet rates
* Add hwtstimeout directive to configure timeout for late timestamps
* Handle late hardware transmit timestamps of NTP requests on all sockets
* Handle mismatched 32/64-bit time_t in SOCK refclock samples
* Improve source replacement
* Log important changes made by command requests (chronyc)
* Refresh address of NTP sources periodically
* Request nanosecond kernel RX timestamping on FreeBSD
* Set DSCP for IPv6 packets
* Shorten NTS-KE retry interval when network is down
* Update seccomp filter for musl
* Warn if loading keys from file with unexpected permissions
* Warn if source selection fails or falseticker is detected
* Add selectopts command to modify source-specific selection options
* Add timestamp sources to serverstats report and make its fields 64-bit
* Add -e option to chronyc to indicate end of response

New in version 4.3
==================

Enhancements
------------
* Add local option to refclock directive to stabilise system clock
  with more stable free-running clock (e.g. TCXO, OCXO)
* Add maxdelayquant option to server/pool/peer directive to replace
  maxdelaydevratio filter with long-term quantile-based filtering
* Add selection option to log directive
* Allow external PPS in PHC refclock without configurable pin
* Don't accept first interleaved response to minimise error in delay
* Don't use arc4random on Linux to avoid server performance loss
* Improve filter option to better handle missing NTP samples
* Improve stability with hardware timestamping and PHC refclock
* Update seccomp filter

Bug fixes
---------
* Fix waitsync command to reconnect when not getting response

New in version 4.2
==================

Enhancements
------------
* Add support for NTPv4 extension field improving synchronisation
  stability and resolution of root delay and dispersion (experimental)
* Add support for NTP over PTP (experimental)
* Add support for AES-CMAC and hash functions in GnuTLS
* Improve server interleaved mode to be more reliable and support
  multiple clients behind NAT
* Update seccomp filter
* Add statistics about interleaved mode to serverstats report

Bug fixes
---------
* Fix RTC support with 64-bit time_t on 32-bit Linux
* Fix seccomp filter to work correctly with bind*device directives
* Suppress kernel adjustments of system clock (dosynctodr) on illumos

Other changes
-------------
* Switch Solaris support to illumos

New in version 4.1
==================

Enhancements
------------
* Add support for NTS servers specified by IP address (matching
  Subject Alternative Name in server certificate)
* Add source-specific configuration of trusted certificates
* Allow multiple files and directories with trusted certificates
* Allow multiple pairs of server keys and certificates
* Add copy option to server/pool directive
* Increase PPS lock limit to 40% of pulse interval
* Perform source selection immediately after loading dump files
* Reload dump files for addresses negotiated by NTS-KE server
* Update seccomp filter and add less restrictive level
* Restart ongoing name resolution on online command

Bug fixes
---------
* Fix responding to IPv4 command requests on FreeBSD
* Fix dump files to not include uncorrected offset
* Fix initstepslew to accept time from own NTP clients
* Reset NTP address and port when no longer negotiated by NTS-KE server

New in version 4.0
==================

Enhancements
------------
* Add support for Network Time Security (NTS) authentication
* Add support for AES-CMAC keys (AES128, AES256) with Nettle
* Add authselectmode directive to control selection of unauthenticated sources
* Add binddevice, bindacqdevice, bindcmddevice directives
* Add confdir directive to better support fragmented configuration
* Add sourcedir directive and "reload sources" command to support dynamic
  NTP sources specified in files
* Add clockprecision directive
* Add dscp directive to set Differentiated Services Code Point (DSCP)
* Add -L option to limit log messages by severity
* Add -p option to print whole configuration with included files
* Add -U option to allow start under non-root user
* Allow maxsamples to be set to 1 for faster update with -q/-Q option
* Avoid replacing NTP sources with sources that have unreachable address
* Improve pools to repeat name resolution to get "maxsources" sources
* Improve source selection with trusted sources
* Improve NTP loop test to prevent synchronisation to itself
* Repeat iburst when NTP source is switched from offline state to online
* Update clock synchronisation status and leap status more frequently
* Update seccomp filter
* Add "add pool" command
* Add "reset sources" command to drop all measurements
* Add authdata command to print details about NTP authentication
* Add selectdata command to print details about source selection
* Add -N option and sourcename command to print original names of sources
* Add -a option to some commands to print also unresolved sources
* Add -k, -p, -r options to clients command to select, limit, reset data

Bug fixes
---------
* Don't set interface for NTP responses to allow asymmetric routing
* Handle RTCs that don't support interrupts
* Respond to command requests with correct address on multihomed hosts

Removed features
----------------
* Drop support for RIPEMD keys (RMD128, RMD160, RMD256, RMD320)
* Drop support for long (non-standard) MACs in NTPv4 packets (chrony 2.x
  clients using non-MD5/SHA1 keys need to use option "version 3")
* Drop support for line editing with GNU Readline

New in version 3.5.1
====================

Security fixes
--------------
* Create new file when writing pidfile (CVE-2020-14367)

New in version 3.5
==================

Enhancements
------------
* Add support for more accurate reading of PHC on Linux 5.0
* Add support for hardware timestamping on interfaces with read-only
  timestamping configuration
* Add support for memory locking and real-time priority on FreeBSD,
  NetBSD, Solaris
* Update seccomp filter to work on more architectures
* Validate refclock driver options

Bug fixes
---------
* Fix bindaddress directive on FreeBSD
* Fix transposition of hardware RX timestamp on Linux 4.13 and later
* Fix building on non-glibc systems

New in version 3.4
==================

Enhancements
------------
* Add filter option to server/pool/peer directive
* Add minsamples and maxsamples options to hwtimestamp directive
* Add support for faster frequency adjustments in Linux 4.19
* Change default pidfile to /var/run/chrony/chronyd.pid to allow
  chronyd without root privileges to remove it on exit
* Disable sub-second polling intervals for distant NTP sources
* Extend range of supported sub-second polling intervals
* Get/set IPv4 destination/source address of NTP packets on FreeBSD
* Make burst options and command useful with short polling intervals
* Modify auto_offline option to activate when sending request failed
* Respond from interface that received NTP request if possible
* Add onoffline command to switch between online and offline state
  according to current system network configuration
* Improve example NetworkManager dispatcher script

Bug fixes
---------
* Avoid waiting in Linux getrandom system call
* Fix PPS support on FreeBSD and NetBSD

New in version 3.3
==================

Enhancements
------------
* Add burst option to server/pool directive
* Add stratum and tai options to refclock directive
* Add support for Nettle crypto library
* Add workaround for missing kernel receive timestamps on Linux
* Wait for late hardware transmit timestamps
* Improve source selection with unreachable sources
* Improve protection against replay attacks on symmetric mode
* Allow PHC refclock to use socket in /var/run/chrony
* Add shutdown command to stop chronyd
* Simplify format of response to manual list command
* Improve handling of unknown responses in chronyc

Bug fixes
---------
* Respond to NTPv1 client requests with zero mode
* Fix -x option to not require CAP_SYS_TIME under non-root user
* Fix acquisitionport directive to work with privilege separation
* Fix handling of socket errors on Linux to avoid high CPU usage
* Fix chronyc to not get stuck in infinite loop after clock step

New in version 3.2
==================

Enhancements
------------
* Improve stability with NTP sources and reference clocks
* Improve stability with hardware timestamping
* Improve support for NTP interleaved modes
* Control frequency of system clock on macOS 10.13 and later
* Set TAI-UTC offset of system clock with leapsectz directive
* Minimise data in client requests to improve privacy
* Allow transmit-only hardware timestamping
* Add support for new timestamping options introduced in Linux 4.13
* Add root delay, root dispersion and maximum error to tracking log
* Add mindelay and asymmetry options to server/peer/pool directive
* Add extpps option to PHC refclock to timestamp external PPS signal
* Add pps option to refclock directive to treat any refclock as PPS
* Add width option to refclock directive to filter wrong pulse edges
* Add rxfilter option to hwtimestamp directive
* Add -x option to disable control of system clock
* Add -l option to log to specified file instead of syslog
* Allow multiple command-line options to be specified together
* Allow starting without root privileges with -Q option
* Update seccomp filter for new glibc versions
* Dump history on exit by default with dumpdir directive
* Use hardening compiler options by default

Bug fixes
---------
* Don't drop PHC samples with low-resolution system clock
* Ignore outliers in PHC tracking, RTC tracking, manual input
* Increase polling interval when peer is not responding
* Exit with error message when include directive fails
* Don't allow slash after hostname in allow/deny directive/command
* Try to connect to all addresses in chronyc before giving up

New in version 3.1
==================

Enhancements
------------
* Add support for precise cross timestamping of PHC on Linux
* Add minpoll, precision, nocrossts options to hwtimestamp directive
* Add rawmeasurements option to log directive and modify measurements
  option to log only valid measurements from synchronised sources
* Allow sub-second polling interval with NTP sources

Bug fixes
---------
* Fix time smoothing in interleaved mode

New in version 3.0
==================

Enhancements
------------
* Add support for software and hardware timestamping on Linux
* Add support for client/server and symmetric interleaved modes
* Add support for MS-SNTP authentication in Samba
* Add support for truncated MACs in NTPv4 packets
* Estimate and correct for asymmetric network jitter
* Increase default minsamples and polltarget to improve stability
  with very low jitter
* Add maxjitter directive to limit source selection by jitter
* Add offset option to server/pool/peer directive
* Add maxlockage option to refclock directive
* Add -t option to chronyd to exit after specified time
* Add partial protection against replay attacks on symmetric mode
* Don't reset polling interval when switching sources to online state
* Allow rate limiting with very short intervals
* Improve maximum server throughput on Linux and NetBSD
* Remove dump files after start
* Add tab-completion to chronyc with libedit/readline
* Add ntpdata command to print details about NTP measurements
* Allow all source options to be set in add server/peer command
* Indicate truncated addresses/hostnames in chronyc output
* Print reference IDs as hexadecimal numbers to avoid confusion with
  IPv4 addresses

Bug fixes
---------
* Fix crash with disabled asynchronous name resolving

New in version 2.4.1
====================

Bug fixes
---------
* Fix processing of kernel timestamps on non-Linux systems
* Fix crash with smoothtime directive
* Fix validation of refclock sample times
* Fix parsing of refclock directive

New in version 2.4
==================

Enhancements
------------
* Add orphan option to local directive for orphan mode compatible with ntpd
* Add distance option to local directive to set activation threshold
  (1 second by default)
* Add maxdrift directive to set maximum allowed drift of system clock
* Try to replace NTP sources exceeding maximum distance
* Randomise source replacement to avoid getting stuck with bad sources
* Randomise selection of sources from pools on start
* Ignore reference timestamp as ntpd doesn't always set it correctly
* Modify tracking report to use same values as seen by NTP clients
* Add -c option to chronyc to write reports in CSV format
* Provide detailed manual pages

Bug fixes
---------
* Fix SOCK refclock to work correctly when not specified as last refclock
* Fix initstepslew and -q/-Q options to accept time from own NTP clients
* Fix authentication with keys using 512-bit hash functions
* Fix crash on exit when multiple signals are received
* Fix conversion of very small floating-point numbers in command packets

Removed features
----------------
* Drop documentation in Texinfo format

New in version 2.3
==================

Enhancements
------------
* Add support for NTP and command response rate limiting
* Add support for dropping root privileges on Mac OS X, FreeBSD, Solaris
* Add require and trust options for source selection
* Enable logchange by default (1 second threshold)
* Set RTC on Mac OS X with rtcsync directive
* Allow binding to NTP port after dropping root privileges on NetBSD
* Drop CAP_NET_BIND_SERVICE capability on Linux when NTP port is disabled
* Resolve names in separate process when seccomp filter is enabled
* Replace old records in client log when memory limit is reached
* Don't reveal local time and synchronisation state in client packets
* Don't keep client sockets open for longer than necessary
* Ignore poll in KoD RATE packets as ntpd doesn't always set it correctly
* Warn when using keys shorter than 80 bits
* Add keygen command to generate random keys easily
* Add serverstats command to report NTP and command packet statistics

Bug fixes
---------
* Fix clock correction after making step on Mac OS X
* Fix building on Solaris

New in version 2.2.1
====================

Security fixes
--------------
* Restrict authentication of NTP server/peer to specified key (CVE-2016-1567)

New in version 2.2
==================

Enhancements
------------
* Add support for configuration and monitoring over Unix domain socket
  (accessible by root or chrony user when root privileges are dropped)
* Add support for system call filtering with seccomp on Linux (experimental)
* Add support for dropping root privileges on NetBSD
* Control frequency of system clock on FreeBSD, NetBSD, Solaris
* Add system leap second handling mode on FreeBSD, NetBSD, Solaris
* Add dynamic drift removal on Mac OS X
* Add support for setting real-time priority on Mac OS X
* Add maxdistance directive to limit source selection by root distance
  (3 seconds by default)
* Add refresh command to get new addresses of NTP sources
* Allow wildcard patterns in include directive
* Restore time from driftfile with -s option if later than RTC time
* Add configure option to set default hwclockfile
* Add -d option to chronyc to enable debug messages
* Allow multiple addresses to be specified for chronyc with -h option
  and reconnect when no valid reply is received
* Make check interval in waitsync command configurable

Bug fixes
---------
* Fix building on NetBSD, Solaris
* Restore time from driftfile with -s option if reading RTC failed

Removed features
----------------
* Drop support for authentication with command key (run-time configuration
  is now allowed only for local users that can access the Unix domain socket)

New in version 2.1.1
====================

Bug fixes
---------
* Fix clock stepping by integer number of seconds on Linux

New in version 2.1
==================

Enhancements
------------
* Add support for Mac OS X
* Try to replace unreachable and falseticker servers/peers specified
  by name like pool sources
* Add leaponly option to smoothtime directive to allow synchronised
  leap smear between multiple servers
* Use specific reference ID when smoothing served time
* Add smoothing command to report time smoothing status
* Add smoothtime command to activate or reset time smoothing

Bug fixes
---------
* Fix crash in source selection with preferred sources
* Fix resetting of time smoothing
* Include packet precision in peer dispersion
* Fix crash in chronyc on invalid command syntax

New in version 2.0
==================

Enhancements
------------
* Update to NTP version 4 (RFC 5905)
* Add pool directive to specify pool of NTP servers
* Add leapsecmode directive to select how to correct clock for leap second
* Add smoothtime directive to smooth served time and enable leap smear
* Add minsources directive to set required number of selectable sources
* Add minsamples and maxsamples options for all sources
* Add tempcomp configuration with list of points
* Allow unlimited number of NTP sources, refclocks and keys
* Allow unreachable sources to remain selected
* Improve source selection
* Handle offline sources as unreachable
* Open NTP server port only when necessary (client access is allowed by
  allow directive/command or peer/broadcast is configured)
* Change default bindcmdaddress to loopback address
* Change default maxdelay to 3 seconds
* Change default stratumweight to 0.001
* Update adjtimex synchronisation status
* Use system headers for adjtimex
* Check for memory allocation errors
* Reduce memory usage
* Add configure options to compile without NTP, cmdmon, refclock support
* Extend makestep command to set automatic clock stepping

Bug fixes
---------
* Add sanity checks for time and frequency offset
* Don't report synchronised status during leap second
* Don't combine reference clocks with close NTP sources
* Fix accepting requests from configured sources
* Fix initial fallback drift setting

New in version 1.31.1
=====================

Security fixes
--------------
* Protect authenticated symmetric NTP associations against DoS attacks
  (CVE-2015-1853)
* Fix access configuration with subnet size indivisible by 4 (CVE-2015-1821)
* Fix initialization of reply slots for authenticated commands (CVE-2015-1822)

New in version 1.31
===================

Enhancements
------------
* Support operation in other NTP eras (next era begins in 2036),
  NTP time is mapped to [-50, +86] years around build date by default
* Restore time from driftfile with -s when RTC is missing/unsupported
* Close connected client sockets when not waiting for reply
* Use one client socket with random port when acquisitionport is 0
* Use NTP packets instead of UDP echo for presend
* Don't adjust polling interval when sending fails
* Allow binding to addresses that don't exist yet
* Ignore measurements around leap second
* Improve detection of unexpected time jumps
* Include example of logrotate configuration, systemd services and
  NetworkManager dispatcher script

Bug fixes
---------
* Reconnect client sockets for each request to follow changes
  in network configuration automatically
* Restart timer when polling interval is changed on reset

New in version 1.30
===================

Enhancements
------------
* Add asynchronous name resolving with POSIX threads
* Add PTP hardware clock (PHC) refclock driver
* Add new generic clock driver to slew by adjusting frequency only
  (without kernel PLL or adjtime) and use it on Linux
* Add rtcautotrim directive to trim RTC automatically
* Add hwclockfile directive to share RTC LOCAL/UTC setting with hwclock
* Add maxslewrate directive to set maximum allowed slew rate
* Add maxdispersion option for refclocks
* Add -q/-Q options to set clock/print offset once and exit
* Allow directives to be specified on chronyd command line
* Replace frequency scaling in Linux driver with retaining of tick
* Try to detect unexpected forward time jumps and reset state
* Exit with non-zero code when maxchange limit is reached
* Improve makestep to not start and stop slew unnecessarily
* Change default corrtimeratio to 3.0 to improve frequency accuracy
* Announce leap second only on last day of June and December
* Use separate connected client sockets for each NTP server
* Remove separate NTP implementation used for initstepslew
* Limit maximum minpoll set by KoD RATE to default maxpoll
* Don't send NTP requests with unknown key
* Print warning when source is added with unknown key
* Take leap second in PPS refclock from locked source
* Make reading of RTC for initial trim more reliable
* Don't create cmdmon sockets when cmdport is 0
* Add configure option to set default user to drop root privileges
* Add configure option to compile with debug messages
* Print debug messages when -d is used more than once
* Change format of messages written to terminal with -d
* Write fatal messages also to stderr with -n
* Use IP_RECVERR socket option in chronyc to not wait unnecessarily
* Shorten default chronyc timeout for localhost
* Change default hostname in chronyc from localhost to 127.0.0.1
* Print error message on invalid syntax with all chronyc commands
* Include simulation test suite using clknetsim

Bug fixes
---------
* Fix crash when selecting with multiple preferred sources
* Fix frequency calculation with large frequency offsets
* Fix code writing drift and RTC files to compile correctly
* Fix -4/-6 options in chronyc to not reset hostname set by -h
* Fix refclock sample validation with sub-second polling interval
* Set stratum correctly with non-PPS SOCK refclock and local stratum
* Modify dispersion accounting in refclocks to prevent PPS getting
  stuck with large dispersion and not accepting new samples

New in version 1.29.1
=====================

Security fixes
--------------
* Modify chronyc protocol to prevent amplification attacks (CVE-2014-0021)
  (incompatible with previous protocol version, chronyc supports both)

New in version 1.29
===================

Security fixes
--------------
* Fix crash when processing crafted commands (CVE-2012-4502)
  (possible with IP addresses allowed by cmdallow and localhost)
* Don't send uninitialized data in SUBNETS_ACCESSED and CLIENT_ACCESSES
  replies (CVE-2012-4503) (not used by chronyc)

Other changes
-------------
* Drop support for SUBNETS_ACCESSED and CLIENT_ACCESSES commands

New in version 1.28
===================

* Combine sources to improve accuracy
* Make config and command parser strict
* Add -a option to chronyc to authenticate automatically
* Add -R option to ignore initstepslew and makestep directives
* Add generatecommandkey, minsamples, maxsamples and user directives
* Improve compatibility with NTPv1 and NTPv2 clients
* Create sockets only in selected family with -4/-6 option
* Treat address bind errors as non-fatal
* Extend tracking log
* Accept float values as initstepslew threshold
* Allow hostnames in offline, online and burst commands
* Fix and improve peer polling
* Fix crash in config parsing with too many servers
* Fix crash with duplicated initstepslew address
* Fix delta calculation with extreme frequency offsets
* Set local stratum correctly
* Remove unnecessary adjtimex calls
* Set paths in documentation by configure
* Update chrony.spec

New in version 1.27
===================

* Support for stronger keys via NSS or libtomcrypt library
* Support reading leap second data from tz database
* Support for precise clock stepping on Linux
* Support for nanoseconds in SHM refclock
* Make offset corrections smoother on Linux
* Make transmit timestamps random below clock precision
* Add corrtimeratio and maxchange directives
* Extend tracking, sources and activity reports
* Wait in foreground process until daemon is fully initialized
* Fix crash with slow name resolving
* Fix iburst with jittery sources
* Fix offset stored in rtc data right after trimrtc
* Fix crash and hang with RTC or manual samples
* Don't use readonly adjtime on Linux kernels before 2.6.28 
* Changed chronyc protocol, incompatible with older versions

New in version 1.26
===================

* Add compatibility with Linux 3.0 and later
* Use proper source address in NTP replies on multihomed IPv6 hosts
* Accept NTP packets with versions 4, 3 and 2
* Cope with unexpected backward time jumps
* Don't reset kernel frequency on start without drift file
* Retry on permanent DNS error by default
* Add waitsync command

New in version 1.25
===================

* Improve accuracy with NTP sources
* Improve accuracy with reference clocks
* Improve polling interval adjustment
* Improve stability with temporary asymmetric delays
* Improve source selection
* Improve initial synchronisation
* Add delayed server name resolving
* Add temperature compensation
* Add nanosecond slewing to Linux driver
* Add fallback drifts
* Add iburst, minstratum, maxdelaydevratio, polltarget,
  prefer, noselect options
* Add rtcsync directive to enable Linux 11-minute mode
* Add reselectdist, stratumweight, logbanner, maxclockerror,
  include directives
* Add -n option to not detach daemon from terminal
* Fix pidfile directive
* Fix name resolving with disabled IPv6 support
* Fix reloading sample histories with reference clocks
* Fix crash with auto_offline option
* Fix online command on auto_offline sources
* Fix file descriptor leaks
* Increase burst polling interval and stop on KoD RATE
* Set maxupdateskew to 1000 ppm by default
* Require password for clients command
* Update drift file at most once per hour
* Use system headers for Linux RTC support
* Reduce default chronyc timeout and make it configurable
* Avoid large values in chronyc sources and sourcestats output
* Add reselect command to force reselecting best source
* Add -m option to allow multiple commands on command line

New in version 1.24
===================

Security fixes
--------------
* Don't reply to invalid cmdmon packets (CVE-2010-0292)
* Limit client log memory size (CVE-2010-0293)
* Limit rate of syslog messages (CVE-2010-0294)

Bug fixes/Enhancements
----------------------
* Support for reference clocks (SHM, SOCK, PPS drivers)
* IPv6 support
* Linux capabilities support (to drop root privileges)
* Memory locking support on Linux
* Real-time scheduler support on Linux
* Leap second support on Linux
* Support for editline library
* Support for new Linux readonly adjtime
* NTP client support for KoD RATE
* Read kernel timestamps for received NTP packets
* Reply to NTP requests with correct address on multihomed hosts
* Retry name resolving after temporary failure
* Fix makestep command, make it available on all systems
* Add makestep directive for automatic clock stepping
* Don't require _bigadj kernel symbol on NetBSD
* Avoid blocking read in Linux RTC driver
* Support for Linux on S/390 and PowerPC
* Fix various bugs on 64-bit systems
* Fix valgrind errors and compiler warnings
* Improve configure to support common options and variables
* Improve status checking and printing in chronyc
* Return non-zero exit code on errors in chronyc
* Reduce request timeout in chronyc
* Print estimated offset in sourcestats
* Changed chronyc protocol, incompatible with older versions

New in version 1.23
===================

* Support for MIPS, x86_64, sparc, alpha, arm, FreeBSD
* Fix serious sign-extension error in handling IP addresses
* RTC support can be excluded at compile time
* Make sources gcc-4 compatible
* Fix various compiler warnings
* Handle fluctuations in peer distance better.
* Fixed handling of stratum zero.
* Fix various problems for 64-bit systems
* Flush chronyc output streams after each command, to allow it to be driven
  through pipes
* Manpage improvements

Version 1.22
============

This release number was claimed by a release that Mandriva made to patch
important bugs in 1.21.  The official numbering has jumped to 1.23 as a
consequence.

New in version 1.21
===================

* Don't include Linux kernel header files any longer : allows chrony to compile
  on recent distros.
* Stop trying to use RTC if continuous streams of error messages would occur
  (Linux with HPET).

New in version 1.20
===================

* Many small tidy-ups and security improvements
* Improve documentation (RTC support in post 2.0 kernels)
* Remove trailing \n from syslog messages
* Syslog messages now include IP and port number when packet cannot be sent.
* Added the "acquisitionport" directive.  (Kalle Olavi Niemitalo)
* Use uname(2) instead of /proc/version to get kernel version.
* Merge support for Linux on Alpha
* Merge support for 64bit architectures
* Don't link -lm if it's not needed
* Fix Solaris build (broken by 64bit change)
* Add detection of Linux 2.5
* Allow arbitrary value of HZ in Linux kernel
* Fix for chrony.spec on SuSE (Paul Elliot)
* Fix handling of initstepslew if no servers are listed (John Hasler)
* Fix install rule in Makefile if chronyd is in use (Juliusz Chroboczek)
* Replace sprintf by snprintf to remove risk of buffer overrun (John Hasler)
* Add --help to configure script

New in version 1.19
===================

* Auto-detect kernel's timer interrupt rate (so-called 'HZ') when chronyd
  starts instead of relying on compiled-in value.
* Fix 2 bugs in function that creates the directory for the log and dump files.
* Amended webpage URL and contact details.
* Generate more informative syslog messages before exiting on failed
  assertions.
* Fix bugs in clamping code for the tick value used when slewing a large
  offset.
* Don't chown files to root during install (should be pointless, and makes RPM
  building awkward as ordinary user.)
* Include chrony.spec file for building RPMs

New in version 1.18
===================
* Amend homepage and mailing list information to chrony.sunsite.dk
* Delete pidfile on exit from chronyd.
* Improvements to readline interface to chronyc
* Only generate syslog message when synchronisation is initially lost (instead
  of on every failed synchronisation attempt)
* Use double fork approach when initialising daemon.
* More things in contrib directory.
* New options to help package builders: --infodir/--mandir for configure, and
  DESTDIR=xxx for make.  (See section 2.2 of chrony.txt for details).
* Changed the wording of the messages generated by mailonchange and logchange
  directives.

New in version 1.17
===================
* Port to NetBSD
* Configuration supports Linux on PPC
* Fix compilation warnings
* Several documentation improvements
* Bundled manpages (taken from the 'missing manpages project')
* Cope with lack of bzero function for Solaris 2.3 systems
* Store chronyd's pid in a file (default /var/run/chronyd.pid) and check if
  chronyd may already be running when starting up.  New pidfile directive in
  configuration file.
* Any size subnet is now allowed in allow and deny commands.  (Example:
  6.7.8/20 or 6.7.8.x/20 (any x) mean a 20 bit subnet).
* The environment variables CC and CFLAGS passed to configure can now be used
  to select the compiler and optimisation/debug options to use
* Write syslog messages when chronyd loses synchronisation.
* Print GPL text when chronyc is run.
* Add NTP broadcast server capability (new broadcast directive).
* Add 'auto_offline' option to server/peer (conf file) or add server/peer (via
  chronyc).
* Add 'activity' command to chronyc, to report how many servers/peers are
  currently online/offline.
* Fix long-standing bug with how the system time quantum was calculated.
* Include support for systems with HZ!=100 (HZ is the timer interrupt
  frequency).
* Include example chrony.conf and chrony.keys files (examples subdirectory).
* Include support for readline in chronyc.

New in version 1.16.1
=====================
* Fix compilation problem on Linux 2.4.13 (spinlock.h / spinlock_t)

New in version 1.16
===================
* More informative captions for 'sources' and 'sourcestats' commands in chronyc
  (use 'sources -v' and 'sourcestats -v' to get them).
* Correct behaviour for Solaris versions>=2.6 (dosynctodr not required on these
  versions.)
* Remove some compiler warnings (Solaris)
* If last line of keys file doesn't have end-of-line, don't truncate final
  character of that key.
* Change timestamp format used in logfiles to make it fully numeric (to aid
  importing data into spreadsheets etc)
* Minor documentation updates and improvements.

New in version 1.15
===================
* Add contributed change to 'configure' to support Solaris 2.8 on x86
* Workaround for assertion failure that arises if two received packets occur
  close together. (Still need to find out why this happens at all.)
* Hopefully fix problem where fast slewing was incompatible with machines
  that have a large background drift rate (=> tick value went out of range
  for adjtimex() on Linux.)
* Fix rtc_linux.c compile problems with 2.4.x kernel include files.
* Include support for RTC device not being at /dev/rtc (new rtcdevice directive
  in configuration file).
* Include support for restricting network interfaces for commands (new
  bindcmdaddress directive in configuration file)
* Fix potential linking fault in pktlength.c (use of CROAK macro replaced by
  normal assert).
* Add some material on bug reporting + contributing to the chrony.texi file
* Made the chrony.texi file "Vim6-friendly" (removed xrefs on @node lines,
  added folding markers to chapters + sections.)
* Switched over to GPL for the licence

New in version 1.14
===================
* Fix compilation for certain other Linux distributions (including Mandrake
  7.1)

New in version 1.13
===================
* Fixed compilation problems on Redhat/SuSE installations with recent 2.2.x
  kernels.
* Minor tidy-ups and documentation enhancements.
* Add support for Linux 2.4 kernels

New in version 1.12
===================

* Trial fix for long-standing bug in Linux RTC estimator when system time is
  slewed.
* Fix bug in chronyc if -h is specified without a hostname
* Fixes to logging various error conditions when operating in daemon mode.
* More stuff under contrib/
* Changes to README file (e.g. about the new chrony-users mailing list)

New in version 1.11a
====================

* Minor changes to contact details
* Minor changes to installation details (chrony subdirectory under doc/)

New in version 1.11
===================

* Improve robustness of installation procedure
* Tidy up documenation and contact details
* Distribute manual as .txt rather than as .ps
* Add -n option to chronyc to work with numeric IP addresses rather than
  names.
* Add material in contrib subdirectory
* Improve robustness of handling drift file and RTC coefficients file
* Improve robustness of regression algorithm

New in version 1.1
==================

Bug fixes
---------

* Made linear regression more resistant to rounding errors (old one
  occasionally generated negative variances which made everything go
  haywire).  Trap infinite or 'not-a-number' values being used to
  alter system clock to increase robustness further.

Other changes/Enhancements
--------------------------

* Support for Linux 2.1 and 2.2 kernels

* New command 'makestep' in chronyc to immediately jump the system
  time to match the NTP estimated time (Linux only) - a response to
  systems booting an hour wrong after summertime/wintertime changes,
  due to RTCs running on local time.  Needs extending to Sun driver
  files too.

* New directives 'logchange' and 'mailonchange' to log to syslog or
  email to a specific address respectively if chronyd detects a clock
  offset exceeding a defined threshold.

* Added capability to log all client/peer NTP accesses and command
  accesses (can be turned off with conf file directive 'noclientlog').
  Added 'clients' command to chronyc to display this data.

* Improved manual mode to use robust regression rather than 2 point
  fit.

* Added 'manual list' and 'manual delete' commands to chronyc to
  allow display of entered timestamps and discretionary deletion of
  outliers.

* If host goes unsynchronised the dummy IP address 0.0.0.0 is detected
  to avoid attempting a reverse name lookup (to stop dial on demand IP
  links from being started)

* Changed chronyc/chronyd protocol so messages are now all variable
  length.  Saves on network bandwidth particularly for large replies
  from chronyd to chronyc (to support the clients command).

* Added bindaddress directive to configuration file, to give
  additional control over limiting which hosts can access the local
  server.

* Groundwork done for a port to Windows NT to compile with Cygwin
  toolkit.  chronyc works (to monitor another host).  sys_winnt.c
  needs finishing to use NT clock control API.  Program structure
  needs adapting to use Windows NT service functions, so it can be
  started at boot time.  Hopefully a Windows NT / Cygwin guru with
  some spare time can take this port over :-)

New in version 1.02
===================

Bug fixes
---------

* Fix error messages in chronyc if daemon is not reachable.

* Fix config file problem for 'allow all' and 'deny all' without a
  trailing machine address.

* Remove fatal failed assertion if command socket cannot be read from
  in daemon.

* Rewrote timezone handling for Linux real time clock, following
  various reported problems related to daylight saving.

Other changes/Enhancements
--------------------------

* Configure script recognizes BSD/386 and uses SunOS 4.1 driver for
  it.

* Log files now print date as day-month-year rather than as a day
  number.  Milliseconds removed from timestamps of logged data.
  Banners included in file to give meanings of columns.

* Only do 1 initial step (followed by a trimming slew) when
  initialising from RTC on Linux (previously did 2 steps).

New in version 1.01
===================

Bug fixes
---------

* Handle timezone of RTC correctly with respect to daylight saving
  time

* Syntax check the chronyc 'local' command properly

* Fixed assertion failed fault in median finder (used by RTC
  regression fitting)

Other changes/Enhancements
--------------------------

* Log selection of new NTP reference source to syslog.

* Don't zero-pad IP address fields

* Add new command to chronyc to allow logfiles to be cycled.

* Extend allow/deny directive syntax in configuration file to so
  directive can apply to all hosts on the Internet.

* Tidy up printout of timestamps to make it clear they are in UTC

* Make 'configure' check the processor type as well as the operating
  system.

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