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Attempt to import adjkerntz...
This commit is contained in:
Andrey A. Chernov
parent
68a21a4b38
commit
3e714780be
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/cvs2svn/branches/unlabeled-1.1.1/; revision=867
4
sbin/adjkerntz/Makefile
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4
sbin/adjkerntz/Makefile
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@ -0,0 +1,4 @@
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PROG= adjkerntz
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MAN8= adjkerntz.8
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.include <bsd.prog.mk>
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122
sbin/adjkerntz/adjkerntz.8
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122
sbin/adjkerntz/adjkerntz.8
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.\" Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd December 15, 1993
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.Dt ADJKERNTZ 8
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.Os FreeBSD
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.Sh NAME
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.Nm adjkerntz
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.Nd "adjusts the kernel time if the machine runs wall CMOS clock"
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.Sh SYNOPSIS
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.Nm adjkerntz
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.Fl i
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.Op Fl v
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.Nm adjkerntz
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.Fl a
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.Op Fl v
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.Sh DESCRIPTION
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.Nm Adjkerntz
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fixes kernel time (makes it UTC) using the current wall CMOS clock value,
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the current time zone rule and the kernel timezone value. The adjustment is
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enabled only if the file
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.Pa /etc/wall_cmos_clock
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exists, in other cases it is assumed that the machine runs UTC CMOS clock and
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.Nm adjkerntz
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does nothing.
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.Pp
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The adjustment is needed at boot stage and when a time zone
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change occurs, so
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.Nm adjkerntz
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can be called in two forms:
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.Bl -tag -width 4n
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.It Cm Fl i
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initialization call from
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.Pa /etc/rc
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(before any daemons are started).
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.Nm Adjkerntz
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makes the first adjustment and the initial time zone offset is stored into
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.Pa /var/run/.adjkerntz
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for following subsequent
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.Nm adjkerntz
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calls.
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.It Cm Fl a
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This form is needed, when time zone changes occur.
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.Nm Adjkerntz
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uses the previously stored
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time zone offset and the changed time zone rule to
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produce the new time zone offset, fix the kernel time and store the new
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offset into
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.Pa /var/run/.adjkerntz
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too.
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It is recommended to use this form in root's
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.Xr crontab 5
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near 3am,
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since this time matches most modern time zone changes.
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.It Cm Fl v
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This option is for diagnostic purposes. It causes
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.Nm adjkerntz
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to print differences between the old and new time zone offsets
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to stdout.
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.El
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.Pp
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.Nm Adjkerntz
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clears the kernel timezone structure and makes kernel always run at UTC
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time zone.
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Super-user privilege is required for all operations.
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.Sh ENVIRONMENT
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.Bl -tag -width Fl
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.It Ev TZ
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Time zone change rule, see
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.Xr tzset 3 ;
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not needed when
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.Xr zic 8
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is used.
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.Sh FILES
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.Bl -tag -width /etc/wall_cmos_clock -compact
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.It Pa /etc/localtime
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Link to the current zone info file, see
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.Xr zic 8 .
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.It Pa /etc/wall_cmos_clock
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Empty file.
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Presence of it indicates that the machine runs wall CMOS clock,
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absence indicates UTC CMOS clock.
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.It Pa /var/run/.adjkerntz
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Text file with the stored current time zone offset in seconds.
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.Sh SEE ALSO
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.Xr tzset 3 ,
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.Xr zic 8 ,
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.Xr rc 8 ,
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.Xr crontab 5
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.Sh DIAGNOSTICS
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No diagnostics, unless \-v option is specified.
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If any error occurs, an error message printed to stderr and
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.Nm adjkerntz
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exits with return code greater than zero.
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.Sh AUTHOR
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Andrew A. Chernov <ache@astral.msk.su>
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.Sh HISTORY
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The
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.Nm adjkerntz
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command appeared in FreeBSD 1.0.1
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180
sbin/adjkerntz/adjkerntz.c
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180
sbin/adjkerntz/adjkerntz.c
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@ -0,0 +1,180 @@
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/*
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* Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#)Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.\n\
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All rights reserved.\n";
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#endif /* not lint */
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/*
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* Andrew A. Chernov <ache@astral.msk.su> Dec 15 1993
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*
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* Fix kernel time value if machine run wall CMOS clock
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* (and /etc/wall_cmos_clock file present)
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* using zoneinfo rules or direct TZ environment variable set.
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* Use Joerg Wunsch idea for seconds accurate offset calculation
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* with Garrett Wollman and Bruce Evans fixes.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include "pathnames.h"
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char storage[] = _PATH_OFFSET;
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int main(argc, argv)
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int argc;
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char **argv;
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{
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struct tm local, utc;
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struct timeval tv, *stv;
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struct timezone tz, *stz;
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/* Avoid time_t here, can be unsigned long */
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long offset, oldoffset, utcsec, localsec, diff;
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int ch, init = -1, verbose = 0;
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FILE *f;
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while ((ch = getopt(argc, argv, "aiv")) != EOF)
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switch((char)ch) {
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case 'i': /* initial call, save offset */
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if (init != -1)
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goto usage;
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init = 1;
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break;
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case 'a': /* adjustment call, use saved offset */
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if (init != -1)
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goto usage;
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init = 0;
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break;
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case 'v': /* verbose */
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verbose = 1;
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break;
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default:
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usage:
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fprintf(stderr, "Usage:\n\
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\tadjkerntz -i [-v]\t(initial call from /etc/rc)\n\
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\tadjkerntz -a [-v]\t(adjustment call from crontab)\n");
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return 2;
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}
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if (init == -1)
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goto usage;
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if (access(_PATH_CLOCK, F_OK))
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return 0;
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/* Restore saved offset */
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if (!init) {
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if ((f = fopen(storage, "r")) == NULL) {
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perror(storage);
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return 1;
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}
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if (fscanf(f, "%ld", &oldoffset) != 1) {
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fprintf(stderr, "Incorrect offset in %s\n", storage);
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return 1;
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}
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(void) fclose(f);
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}
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else
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oldoffset = 0;
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/****** Critical section, do all things as fast as possible ******/
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/* get local CMOS clock and possible kernel offset */
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if (gettimeofday(&tv, &tz)) {
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perror("gettimeofday");
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return 1;
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}
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/* get the actual local timezone difference */
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local = *localtime(&tv.tv_sec);
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utc = *gmtime(&tv.tv_sec);
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utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
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/* because it assumed local time */
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/* calculate local CMOS diff from GMT */
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utcsec = mktime(&utc);
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localsec = mktime(&local);
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if (utcsec == -1 || localsec == -1) {
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fprintf(stderr, "Wrong hour to call\n");
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return 1;
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}
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offset = utcsec - localsec;
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/* correct the kerneltime for this diffs */
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/* subtract kernel offset, if present, old offset too */
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diff = oldoffset + tz.tz_minuteswest * 60 - offset;
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if (diff != 0) {
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tv.tv_sec += diff;
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tv.tv_usec = 0; /* we are restarting here... */
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stv = &tv;
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}
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else
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stv = NULL;
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if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
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tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
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stz = &tz;
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}
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else
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stz = NULL;
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if (stz != NULL || stv != NULL) {
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if (settimeofday(stv, stz)) {
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perror("settimeofday");
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return 1;
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}
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}
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/****** End of critical section ******/
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if (verbose)
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printf("Calculated zone offset diffs: %ld seconds\n", diff);
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if (offset != oldoffset) {
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(void) umask(022);
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/* Save offset for next calls from crontab */
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if ((f = fopen(storage, "w")) == NULL) {
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perror(storage);
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return 1;
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}
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fprintf(f, "%ld\n", offset);
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if (fclose(f)) {
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perror(storage);
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return 1;
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}
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}
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return 0;
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}
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36
sbin/adjkerntz/pathnames.h
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36
sbin/adjkerntz/pathnames.h
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@ -0,0 +1,36 @@
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/*
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* Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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||||
* are met:
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* 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.
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||||
*
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* 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
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <paths.h>
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/*
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* Offset file name started with '.', because "adjkerntz -i"
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* called in /etc/rc before cleaning '*' in /var/run,
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* and this file should be keeped after it.
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*/
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#define _PATH_OFFSET "/var/run/.adjkerntz"
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#define _PATH_CLOCK "/etc/wall_cmos_clock"
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