File ntp-4.2.0.ntpdate_overflow.patch of Package ntp

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File ntp-4.2.0.ntpdate_overflow.patch of Package ntp

--- ntpdate/ntpdate.c
+++ ntpdate/ntpdate.c
@@ -1255,14 +1255,24 @@
 	register struct server *sp, *server;
 	s_fp absoffset;
 	int dostep;
+	l_fp big;
+	int dobigstep = 0;
 
 	for (sp = sys_servers; sp != NULL; sp = sp->next_server)
 		clock_filter(sp);
 	server = clock_select();
 
+	if ( server && server->offset.l_i < 0 && server->xmt.l_ui < server->reftime.l_ui/2 ) {
+	  /* overflow condition: negtaive offset although reference time
+	   * is significant greater than system time. */
+	  dobigstep = 1;
+	}
+	
 	if (debug || simple_query) {
 		for (sp = sys_servers; sp != NULL; sp = sp->next_server)
 			printserver(sp, stdout);
+		if (dobigstep)
+			(void) fprintf(stdout, "big step: offset %s\n", ulfptoa(&server->offset, 6));
 	}
 
 	if (server == 0) {
@@ -1271,7 +1281,7 @@
 		return(1);
 	}
 
-	if (always_step) {
+	if (always_step || dobigstep) {
 		dostep = 1;
 	} else if (never_step) {
 		dostep = 0;
@@ -1284,9 +1294,16 @@
 
 	if (dostep) {
 		if (simple_query || l_step_systime(&server->offset)) {
-			msyslog(LOG_NOTICE, "step time server %s offset %s sec",
-				stoa(&server->srcadr),
-				lfptoa(&server->offset, 6));
+			if (dobigstep) {
+				L_ADD(&server->offset, &big);
+				msyslog(LOG_NOTICE, "step time server %s offset %s sec",
+					stoa(&server->srcadr),
+					ulfptoa(&server->offset, 6));
+			} else {
+				msyslog(LOG_NOTICE, "step time server %s offset %s sec",
+					stoa(&server->srcadr),
+					lfptoa(&server->offset, 6));
+			}
 		}
 	} else {
 #if !defined SYS_WINNT && !defined SYS_CYGWIN32

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File ntp-4.2.0.ntpdate_overflow.patch of Package ntp

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