--- loncom/lond	2006/05/30 15:39:56	1.331
+++ loncom/lond	2006/05/31 14:47:56	1.332
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.331 2006/05/30 15:39:56 www Exp $
+# $Id: lond,v 1.332 2006/05/31 14:47:56 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -59,7 +59,7 @@ my $DEBUG = 0;		       # Non zero to ena
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.331 $'; #' stupid emacs
+my $VERSION='$Revision: 1.332 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -2126,6 +2126,7 @@ 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);