mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-26 02:20:51 +01:00
112 lines
3.4 KiB
Groff
112 lines
3.4 KiB
Groff
.\" Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd December 15, 1993
|
|
.Dt ADJKERNTZ 8
|
|
.Os FreeBSD
|
|
.Sh NAME
|
|
.Nm adjkerntz
|
|
.Nd "adjusts the kernel time if the machine runs wall CMOS clock"
|
|
.Sh SYNOPSIS
|
|
.Nm adjkerntz
|
|
.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.
|
|
.Pp
|
|
The adjustment is usually needed at boot stage and when a time zone
|
|
change occurs.
|
|
.Nm Adjkerntz
|
|
started in
|
|
.Pa /etc/rc
|
|
(before any daemons are started).
|
|
.Nm Adjkerntz
|
|
makes the first adjustment and the initial time zone offset is stored into
|
|
.Pa adjkerntz
|
|
kernel variable
|
|
for following subsequent
|
|
.Nm adjkerntz
|
|
time zone change spying.
|
|
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
|
|
offset into
|
|
.Pa adjkerntz
|
|
kernel variable
|
|
too.
|
|
.Pp
|
|
.Nm Adjkerntz
|
|
clears the kernel timezone structure and makes kernel always run at UTC
|
|
time zone.
|
|
Super-user privilege is required for all operations.
|
|
.Sh ENVIRONMENT
|
|
.Bl -tag -width Fl
|
|
.It Ev TZ
|
|
Time zone change rule, see
|
|
.Xr tzset 3 ;
|
|
not needed when
|
|
.Xr /usr/sbin/tzsetup
|
|
or
|
|
.Xr zic 8
|
|
is used.
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/wall_cmos_clock -compact
|
|
.It Pa /etc/localtime
|
|
current zoneinfo file, see
|
|
.Xr /usr/sbin/tzsetup
|
|
and
|
|
.Xr zic 8 .
|
|
.It Pa /etc/wall_cmos_clock
|
|
Empty file.
|
|
Presence of it indicates that the machine runs wall CMOS clock,
|
|
absence indicates UTC CMOS clock.
|
|
.Sh SEE ALSO
|
|
.Xr tzset 3 ,
|
|
.Xr zic 8 ,
|
|
.Xr rc 8 ,
|
|
.Xr sysctl 8 ,
|
|
.Xr /usr/sbin/tzsetup
|
|
.Sh DIAGNOSTICS
|
|
No diagnostics.
|
|
If any error occurs, an error message printed via
|
|
.Xr syslog 3
|
|
and
|
|
.Nm adjkerntz
|
|
exits with return code greater than zero.
|
|
.Sh AUTHOR
|
|
Andrew A. Chernov <ache@astral.msk.su>
|
|
.Sh HISTORY
|
|
The
|
|
.Nm adjkerntz
|
|
command appeared in FreeBSD 1.0.1
|
|
|