--- loncom/loncron	2019/03/18 00:37:37	1.118
+++ loncom/loncron	2019/07/18 18:28:40	1.119
@@ -2,7 +2,7 @@
 
 # Housekeeping program, started by cron, loncontrol and loncron.pl
 #
-# $Id: loncron,v 1.118 2019/03/18 00:37:37 raeburn Exp $
+# $Id: loncron,v 1.119 2019/07/18 18:28:40 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -567,6 +567,34 @@ sub clean_webDAV_sessionIDs {
     }
 }
 
+# ------------------------------------------------------------ clean out ltiIDs
+
+sub clean_ltiIDs {
+    my ($fh)=@_;
+    &log($fh,'<hr /><a name="ltisessions" /><h2>LTI Session Pointers</h2>');
+    my $cleaned=0;
+    my $active=0;
+    if (-d $perlvar{'ltiIDsDir'}) {
+        while (my $fname=<$perlvar{'ltiIDsDir'}/*>) {
+            my ($dev,$ino,$mode,$nlink,
+                $uid,$gid,$rdev,$size,
+                $atime,$mtime,$ctime,
+                $blksize,$blocks)=stat($fname);
+            my $now=time;
+            my $since=$now-$mtime;
+            if ($since>$perlvar{'lonExpire'}) {
+                $cleaned++;
+                &log($fh,"Unlinking $fname<br />");
+                unlink("$fname");
+            } else {
+                $active++;
+            }
+        }
+    }
+    &log($fh,"<p>Cleaned up ".$cleaned." old LTI session pointers.</p>");
+    &log($fh,"<h3>$active unexpired LTI session pointers</h3>");
+}
+
 # ----------------------------------------------------------- clean out sockets
 sub clean_sockets {
     my ($fh)=@_;
@@ -1595,6 +1623,7 @@ sub main () {
 	&clean_lonIDs($fh);
         &clean_balanceIDs($fh);
         &clean_webDAV_sessionIDs($fh);
+        &clean_ltiIDs($fh);
 	&check_httpd_logs($fh);
 	&rotate_lonnet_logs($fh);
 	&rotate_other_logs($fh);