4 files changed, 342 insertions, 0 deletions

diff --git a/sbin/adjkerntz/Makefile b/sbin/adjkerntz/Makefile
new file mode 100644
index 000000000000..1ac5047b6f6a
--- /dev/null
+++ b/sbin/adjkerntz/Makefile
@@ -0,0 +1,4 @@
+PROG=   adjkerntz
+MAN8=   adjkerntz.8
+
+.include <bsd.prog.mk>
diff --git a/sbin/adjkerntz/adjkerntz.8 b/sbin/adjkerntz/adjkerntz.8
new file mode 100644
index 000000000000..ac8fb5fbc952
--- /dev/null
+++ b/sbin/adjkerntz/adjkerntz.8
@@ -0,0 +1,122 @@
+.\" 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
+.Fl i
+.Op Fl v
+.Nm adjkerntz
+.Fl a
+.Op Fl v
+.Sh DESCRIPTION
+.Nm Adjkerntz
+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.
+.Pp
+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
+makes the first adjustment and the initial time zone offset is stored into
+.Pa /var/run/.adjkerntz
+for following subsequent
+.Nm adjkerntz
+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 the kernel time and store the new
+offset into
+.Pa /var/run/.adjkerntz
+too.
+It is recommended to use this form in root's
+.Xr crontab 5
+near 3am,
+since this time matches most modern time zone changes.
+.It Cm Fl v
+This option is for diagnostic purposes. It causes
+.Nm adjkerntz
+to print differences between the old and new time zone offsets
+to stdout.
+.El
+.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 zic 8
+is used.
+.Sh FILES
+.Bl -tag -width /etc/wall_cmos_clock -compact
+.It Pa /etc/localtime
+Link to the current zone info file, see
+.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.
+.It Pa /var/run/.adjkerntz
+Text file with the stored current time zone offset in seconds.
+.Sh SEE ALSO
+.Xr tzset 3 ,
+.Xr zic 8 ,
+.Xr rc 8 ,
+.Xr crontab 5
+.Sh DIAGNOSTICS
+No diagnostics, unless \-v option is specified.
+If any error occurs, an error message printed to stderr 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
+
diff --git a/sbin/adjkerntz/adjkerntz.c b/sbin/adjkerntz/adjkerntz.c
new file mode 100644
index 000000000000..8cb885cc52b6
--- /dev/null
+++ b/sbin/adjkerntz/adjkerntz.c
@@ -0,0 +1,180 @@
+/*
+ * 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.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#)Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+/*
+ * Andrew A. Chernov   <ache@astral.msk.su>    Dec 15 1993
+ *
+ * Fix kernel time value if machine run wall CMOS clock
+ * (and /etc/wall_cmos_clock file present)
+ * using zoneinfo rules or direct TZ environment variable set.
+ * Use Joerg Wunsch idea for seconds accurate offset calculation
+ * with Garrett Wollman and Bruce Evans fixes.
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include "pathnames.h"
+
+char storage[] = _PATH_OFFSET;
+
+int main(argc, argv)
+	int argc;
+	char **argv;
+{
+	struct tm local, utc;
+	struct timeval tv, *stv;
+	struct timezone tz, *stz;
+	/* Avoid time_t here, can be unsigned long */
+	long offset, oldoffset, utcsec, localsec, diff;
+	int ch, init = -1, verbose = 0;
+	FILE *f;
+
+	while ((ch = getopt(argc, argv, "aiv")) != EOF)
+		switch((char)ch) {
+		case 'i':               /* initial call, save offset */
+			if (init != -1)
+				goto usage;
+			init = 1;
+			break;
+		case 'a':               /* adjustment call, use saved offset */
+			if (init != -1)
+				goto usage;
+			init = 0;
+			break;
+		case 'v':               /* verbose */
+			verbose = 1;
+			break;
+		default:
+		usage:
+			fprintf(stderr, "Usage:\n\
+\tadjkerntz -i [-v]\t(initial call from /etc/rc)\n\
+\tadjkerntz -a [-v]\t(adjustment call from crontab)\n");
+			return 2;
+		}
+	if (init == -1)
+		goto usage;
+
+	if (access(_PATH_CLOCK, F_OK))
+		return 0;
+
+	/* Restore saved offset */
+
+	if (!init) {
+		if ((f = fopen(storage, "r")) == NULL) {
+			perror(storage);
+			return 1;
+		}
+		if (fscanf(f, "%ld", &oldoffset) != 1) {
+			fprintf(stderr, "Incorrect offset in %s\n", storage);
+			return 1;
+		}
+		(void) fclose(f);
+	}
+	else
+		oldoffset = 0;
+
+/****** Critical section, do all things as fast as possible ******/
+
+	/* get local CMOS clock and possible kernel offset */
+	if (gettimeofday(&tv, &tz)) {
+		perror("gettimeofday");
+		return 1;
+	}
+
+	/* get the actual local timezone difference */
+	local = *localtime(&tv.tv_sec);
+	utc = *gmtime(&tv.tv_sec);
+	utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
+				       /* because it assumed local time */
+
+	/* calculate local CMOS diff from GMT */
+
+	utcsec = mktime(&utc);
+	localsec = mktime(&local);
+	if (utcsec == -1 || localsec == -1) {
+		fprintf(stderr, "Wrong hour to call\n");
+		return 1;
+	}
+	offset = utcsec - localsec;
+
+	/* correct the kerneltime for this diffs */
+	/* subtract kernel offset, if present, old offset too */
+
+	diff = oldoffset + tz.tz_minuteswest * 60 - offset;
+	if (diff != 0) {
+		tv.tv_sec += diff;
+		tv.tv_usec = 0;       /* we are restarting here... */
+		stv = &tv;
+	}
+	else
+		stv = NULL;
+
+	if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
+		tz.tz_dsttime = tz.tz_minuteswest = 0;  /* zone info is garbage */
+		stz = &tz;
+	}
+	else
+		stz = NULL;
+
+	if (stz != NULL || stv != NULL) {
+		if (settimeofday(stv, stz)) {
+			perror("settimeofday");
+			return 1;
+		}
+	}
+
+/****** End of critical section ******/
+
+	if (verbose)
+		printf("Calculated zone offset diffs: %ld seconds\n", diff);
+
+	if (offset != oldoffset) {
+		(void) umask(022);
+		/* Save offset for next calls from crontab */
+		if ((f = fopen(storage, "w")) == NULL) {
+			perror(storage);
+			return 1;
+		}
+		fprintf(f, "%ld\n", offset);
+		if (fclose(f)) {
+			perror(storage);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
diff --git a/sbin/adjkerntz/pathnames.h b/sbin/adjkerntz/pathnames.h
new file mode 100644
index 000000000000..a8b751fa5f23
--- /dev/null
+++ b/sbin/adjkerntz/pathnames.h
@@ -0,0 +1,36 @@
+/*
+ * 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.
+ */
+
+#include <paths.h>
+
+/*
+ * Offset file name started with '.', because "adjkerntz -i"
+ * called in /etc/rc before cleaning '*' in /var/run,
+ * and this file should be keeped after it.
+ */
+#define _PATH_OFFSET "/var/run/.adjkerntz"
+
+#define _PATH_CLOCK "/etc/wall_cmos_clock"