MFC r320242, r320256:

Update leap-seconds to leap-seconds.3676924800.

As per https://datacenter.iers.org/eop/-/somos/5Rgv/latest/16:

INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)

SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE

SERVICE DE LA ROTATION TERRESTRE
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. : 33 (0) 1 40 51 23 35
FAX : 33 (0) 1 40 51 22 91
Internet : services.iers@obspm.fr

Paris, 9 January 2017

Bulletin C 53

To authorities responsible
for the measurement and
distribution of time

INFORMATION ON UTC - TAI

NO leap second will be introduced at the end of June 2017.
The difference between Coordinated Universal Time UTC and the
International Atomic Time TAI is :

from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s

Leap seconds can be introduced in UTC at the end of the months of December
or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
six months, either to announce a time step in UTC, or to confirm that there
will be no time step at the next possible date.

Christian BIZOUARD
Director
Earth Orientation Center of IERS
Observatoire de Paris, France

Obtained from: ftp://time.nist.gov/pub/leap-seconds.3676924800

MFC r304779, r304780, r304781, r304782, r304802

r304779:

Revert r298887 (spelling fix) and remove $FreeBSD$ because text changes
to leap-seconds invaldidates validation hash at the end of the file.

Remove svn:keywords and replace with fbsd:nokeywords=yes to
support this change.

r304780:

Change the algorithm by which /var/db/leap-seconds is updated.

1. Use the leap-seconds version number (update time) to determine
whether to update the file or not.

2. If the version numbers of the files is the same, use the later
expiry date to determine which file to use.

Suggested by: ian@

r304781:

Add logic to replace the working ntp leap-seconds file in /var/db
if it contains a $FreeBSD$ header. The header will cause the file
to fail checksum of the hash causing ntpd to ignore the file.

r304782:

Make validation of the leap-seconds file unconditional.

r304802:

Remove the gratuitous check for $FreeBSD$ and rename the function
to ntpd_init_leapfile, to ensure a copy exists in /var/db if a copy
isn't already there.

Reported by: ache@

MFC r303160.

Update leap-seconds to leap-seconds.3676752000.

As per https://datacenter.iers.org/web/guest/eop/-/somos/5Rgv/latest/16:

UTC TIME STEP
on the 1st of January 2017

A positive leap second will be introduced at the end of December 2016.
The sequence of dates of the UTC second markers will be:

2016 December 31, 23h 59m 59s
2016 December 31, 23h 59m 60s
2017 January 1, 0h 0m 0s

The difference between UTC and the International Atomic Time TAI is:

from 2015 July 1, 0h UTC, to 2017 January 1 0h UTC : UTC-TAI = - 36s
from 2017 January 1, 0h UTC, until further notice : UTC-TAI = - 37s

Obtained from: ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.3676752000
See also: https://www.iers.org/SharedDocs/News/EN/BulletinC.html
https://datacenter.iers.org/web/guest/eop/-/somos/5Rgv/latest/16

Relnotes: yes

MFC r300180:

Update leap-seconds to leap-seconds.3661459200.
NO leap second will be introduced at the end of June 2016.

Obtained from: ftp://tycho.usno.navy.mil/pub/ntp/.
See also: http://www.iers.org/SharedDocs/News/EN/BulletinC.html

MFC r298881, 298882, 298883, 298885:

Minor spelling fixes in:
tools, share, bluetooth, pmcstat, etc

Many of these have user-visible strings.

MFC r289421, r293037, r294773, and r294884.

ntp leap-leapseconds support.

r289421:

Add default leap-seconds file. This should help ntp networks get the
leap second date correct

Updates to the file can be obtained from ftp://time.nist.gov/pub/ or
ftp://tycho.usno.navy.mil/pub/ntp/.

r293037:

Update leap-seconds to latest. This will satisfy the ntpd leap-second
version check.

r294773:

Add support for automatic leap-second file updates.

The working copy of leapfile resides in /var/dbntpd.leap-seconds.list.
/etc/ntp/leap-seconds (periodically updated from ftp://time.nist.gov/pub/
or ftp://tycho.usno.navy.mil/pub/ntp/) contains the master copy should
automatic leapfile updates be disabled (default).

Automatic leapfile updates are fetched from $ntp_leapfile_sources,
defaulting to https://www.ietf.org/timezones/data/leap-seconds.list,
within $ntp_leapfile_expiry_days (default 30 days) from leap-seconds
file expiry. Automatic updates can be enabled by setting
$daily_ntpd_leapfile_enable="YES" in periodic.conf. To avoid congesting
the ntp leapfile source the automatic update randomized by default but
can be disabled through daily_ntpd_avoid_congestion="NO" in
periodic.conf.

r294884:

Allow specification of fetch options for ntp leap-seconds fetch.

Approved by: re (gjb)

Add default leap-seconds file. This should help ntp networks get the
leap second date correct

Updates to the file can be obtained from ftp://time.nist.gov/pub/ or
ftp://tycho.usno.navy.mil/pub/ntp/.

Suggested by: dwmalone
Reviewed by: roberto, dwmalone, delphij
Approved by: roberto
MFC after: 1 week