Made the special handling of the daylight time switches optional,

enabled by the option "-s" (for dSt). This returned the default behavior
to its original form.

The new option name is not "-d" because that would cause associations with
"debug" and cron already has "-x" for debugging, so this would cause
confusion.

2 files changed, 19 insertions, 6 deletions

diff --git a/usr.sbin/cron/cron/cron.8 b/usr.sbin/cron/cron/cron.8
index 45f2aa0..1357533 100644
--- a/usr.sbin/cron/cron/cron.8
+++ b/usr.sbin/cron/cron/cron.8
@@ -25,6 +25,7 @@
 .Nd daemon to execute scheduled commands (Vixie Cron)
 .Sh SYNOPSIS
 .Nm
+.Op Fl s
 .Op Fl x Ar debugflag Ns Op ,...
 .Sh DESCRIPTION
 .Nm Cron
@@ -69,10 +70,16 @@ need not be restarted whenever a crontab file is modified.  Note that the
 command updates the modtime of the spool directory whenever it changes a
 crontab.
 .Pp
+Available options:
+.Bl -tag -width Ds
+.It Fl s
+Enable special handling of the switching between the standard time and
+daylight saving time.
+.Pp
 If the time zone has daylight saving time which differs by one hour from
 the standard time and the switch to and from daylight saving time occurs
-at :00 minutes (as in most of Asia, Europe and North America) then these
-time switches are handled specially by 
+at :00 minutes (as in most of the world with very few exceptions) then these
+time switches would be handled specially by 
 .Nm cron .
 The time zones with other variations of daylight saving time (such as with
 30 minutes difference or switched at :30 minutes etc.) do not have such
@@ -95,6 +102,7 @@ during the switch to daylight saving time, such jobs are
 executed during the next hour at the first minute that is specified 
 for them in
 .Xr crontab 5 .
+.El
 .Sh SEE ALSO
 .Xr crontab 1 ,
 .Xr crontab 5 
diff --git a/usr.sbin/cron/cron/cron.c b/usr.sbin/cron/cron/cron.c
index 8c4d737..f4b990f 100644
--- a/usr.sbin/cron/cron/cron.c
+++ b/usr.sbin/cron/cron/cron.c
@@ -45,12 +45,13 @@ static	void	usage __P((void)),
 		parse_args __P((int c, char *v[]));
 
 static time_t	last_time = 0;
+static int	dst_enabled = 0;
 
 static void
 usage() {
     char **dflags;
 
-	fprintf(stderr, "usage: cron [-x debugflag[,...]]\n");
+	fprintf(stderr, "usage: cron [-s] [-x debugflag[,...]]\n");
 	fprintf(stderr, "\ndebugflags: ");
 
         for(dflags = DebugFlagNames; *dflags; dflags++) {
@@ -186,8 +187,9 @@ cron_tick(db)
 	 * we support only change by +-1 hour happening at :00 minutes,
 	 * those living in more strange timezones are out of luck
 	 */
-	if (last_time != 0 && tm->tm_isdst != lasttm.tm_isdst
-	&& TargetTime > last_time /* exclude stepping back */) {
+	if (dst_enabled && last_time != 0 
+	&& TargetTime > last_time /* exclude stepping back */
+	&& tm->tm_isdst != lasttm.tm_isdst ) {
 		int	prevhr, nexthr, runtime;
 		int	lastmin, lasthour; 
 		int	trandom, tranmonth, trandow;
@@ -432,8 +434,11 @@ parse_args(argc, argv)
 {
 	int	argch;
 
-	while ((argch = getopt(argc, argv, "x:")) != -1) {
+	while ((argch = getopt(argc, argv, "sx:")) != -1) {
 		switch (argch) {
+		case 's':
+			dst_enabled = 1;
+			break;
 		case 'x':
 			if (!set_debug_flags(optarg))
 				usage();