--- loncom/lond	2006/05/18 19:58:36	1.305.2.6
+++ loncom/lond	2006/05/31 14:46:48	1.305.2.7
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.305.2.6 2006/05/18 19:58:36 albertel Exp $
+# $Id: lond,v 1.305.2.7 2006/05/31 14:46:48 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -61,7 +61,7 @@ my $status='';
 my $lastlog='';
 my $lond_max_wait_time = 13;
 
-my $VERSION='$Revision: 1.305.2.6 $'; #' stupid emacs
+my $VERSION='$Revision: 1.305.2.7 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -2290,6 +2290,7 @@ sub token_auth_user_file_handler {
     my $reply="non_auth\n";
     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
 	     $session.'.id')) {
+	flock(ENVIN,LOCK_SH);
 	while (my $line=<ENVIN>) {
 	    my ($envname)=split(/=/,$line,2);
 	    $envname=&unescape($envname);