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Restore back -i, -a

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This commit is contained in:
Andrey A. Chernov 1994-11-02 10:04:11 +00:00
parent 76a581c4ce
commit fb833e7272
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=4093
1 changed files with 21 additions and 10 deletions
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31
sbin/adjkerntz/adjkerntz.8
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@ -30,21 +30,26 @@
.Nd "adjusts the kernel time if the machine runs wall CMOS clock"
.Sh SYNOPSIS
.Nm adjkerntz
.Fl i
.Nm adjkerntz
.Fl a
.Sh DESCRIPTION
.Nm Adjkerntz
daemon
fixes kernel time (makes it UTC) using the current wall CMOS clock value,
the current time zone rule and the kernel timezone value. The adjustment is
enabled only if the file
.Pa /etc/wall_cmos_clock
exists, in other cases it is assumed that the machine runs UTC CMOS clock and
.Nm adjkerntz
does nothing and exits immediately.
does nothing.
.Pp
The adjustment is usually needed at boot stage and when a time zone
change occurs.
.Nm Adjkerntz
started in
The adjustment is needed at boot stage and when a time zone
change occurs, so
.Nm adjkerntz
can be called in two forms:
.Bl -tag -width 4n
.It Cm Fl i
initialization call from
.Pa /etc/rc
(before any daemons are started).
.Nm Adjkerntz
@ -53,16 +58,21 @@ makes the first adjustment and the initial time zone offset is stored into
kernel variable
for following subsequent
.Nm adjkerntz
time zone change spying.
When time zone changes occur,
calls.
.It Cm Fl a
This form is needed, when time zone changes occur.
.Nm Adjkerntz
uses the previously stored
time zone offset and the changed time zone rule to
produce the new time zone offset, fix RTC clock and store the new
produce the new time zone offset, fix the RTC clock and store the new
offset into
.Pa adjkerntz
kernel variable
too.
It is recommended to use this form in root's
.Xr crontab 5
every half of a hour from 0am to 4am
since this times matches most modern time zone changes.
.Pp
.Nm Adjkerntz
clears the kernel timezone structure and makes kernel always run at UTC
@ -81,7 +91,7 @@ is used.
.Sh FILES
.Bl -tag -width /etc/wall_cmos_clock -compact
.It Pa /etc/localtime
current zoneinfo file, see
Current zoneinfo file, see
.Xr /usr/sbin/tzsetup
and
.Xr zic 8 .
@ -93,6 +103,7 @@ absence indicates UTC CMOS clock.
.Xr tzset 3 ,
.Xr zic 8 ,
.Xr rc 8 ,
.Xr crontab 5 ,
.Xr sysctl 8 ,
.Xr /usr/sbin/tzsetup
.Sh DIAGNOSTICS