--- loncom/loncnew	2003/06/25 01:54:44	1.11
+++ loncom/loncnew	2003/07/02 01:31:55	1.13
@@ -2,7 +2,7 @@
 # The LearningOnline Network with CAPA
 # lonc maintains the connections to remote computers
 #
-# $Id: loncnew,v 1.11 2003/06/25 01:54:44 foxr Exp $
+# $Id: loncnew,v 1.13 2003/07/02 01:31:55 foxr Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -46,6 +46,9 @@
 
 # Change log:
 #    $Log: loncnew,v $
+#    Revision 1.13  2003/07/02 01:31:55  foxr
+#    Added kill -HUP logic (restart).
+#
 #    Revision 1.11  2003/06/25 01:54:44  foxr
 #    Fix more problems with transaction failure.
 #
@@ -71,6 +74,7 @@ use lib "/home/httpd/lib/perl/";
 use lib "/home/foxr/newloncapa/types";
 use Event qw(:DEFAULT );
 use POSIX qw(:signal_h);
+use POSIX;
 use IO::Socket;
 use IO::Socket::INET;
 use IO::Socket::UNIX;
@@ -287,11 +291,7 @@ Invoked  each timer tick.
 sub Tick {
     my $client;
     ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount);
-    Debug(10,"Tick");
-    Debug(10,"    Current connection count: ".$ConnectionCount);
-    foreach $client (keys %ActiveClients) {
-	Debug(10,"    Have client:  with id: ".$ActiveClients{$client});
-    }
+
     # Is it time to prune connection count:
 
 
@@ -523,6 +523,7 @@ sub StartClientReply {
     my $Transaction   = shift;
     my $data     = shift;
 
+
     my $Client   = $Transaction->getClient();
 
     &Debug(8," Reply was: ".$data);
@@ -716,8 +717,10 @@ sub LondReadable {
     my $State = $Socket->GetState(); # All action depends on the state.
 
     SocketDump(6, $Socket);
+    my $status = $Socket->Readable();
+    &Debug(2, "Socket->Readable returned: $status");
 
-    if($Socket->Readable() != 0) {
+    if($status != 0) {
 	 # bad return from socket read. Currently this means that
 	# The socket has become disconnected. We fail the transaction.
 
@@ -982,7 +985,7 @@ sub QueueDelayed {
 	my $Handle = IO::File->new($reqfile);
 	my $cmd    = <$Handle>;
 	chomp $cmd;		# There may or may not be a newline...
-	$cmd = $cmd."\ny";	# now for sure there's exactly one newline.
+	$cmd = $cmd."\n";	# now for sure there's exactly one newline.
 	my $Transaction = LondTransaction->new($cmd);
 	$Transaction->SetDeferred($reqfile);
 	QueueTransaction($Transaction);
@@ -1293,9 +1296,9 @@ Called in response to a signal that caus
 
 =cut
 
-=pod
 
 sub SignalledToDeath {
+    Debug(2,"Signalled to death!");
     my ($signal) = @_;
     chomp($signal);
     Log("CRITICAL", "Abnormal exit.  Child $$ for $RemoteHost "
@@ -1303,6 +1306,7 @@ sub SignalledToDeath {
     LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
 	    ."\"$signal\"");
     die("Signal abnormal end");
+    exit 0;
 
 }
 =head2 ChildProcess
@@ -1319,7 +1323,7 @@ sub ChildProcess {
     $SIG{QUIT}  = \&SignalledToDeath;
     $SIG{HUP}   = IGNORE;
     $SIG{USR1}  = IGNORE;
-    $SIG{INT}   = IGNORE;
+    $SIG{INT}   = DEFAULT;
     $SIG{CHLD}  = IGNORE;
     $SIG{__DIE__}  = \&SignalledToDeath;
 
@@ -1346,15 +1350,21 @@ sub ChildProcess {
 #  Create a new child for host passed in:
 
 sub CreateChild {
+    my $sigset = POSIX::SigSet->new(SIGINT);
+    sigprocmask(SIG_BLOCK, $sigset);
     my $host = shift;
     $RemoteHost = $host;
     Log("CRITICAL", "Forking server for ".$host);
     $pid          = fork;
     if($pid) {			# Parent
 	$ChildHash{$pid} = $RemoteHost;
+	sigprocmask(SIG_UNBLOCK, $sigset);
+
     } else {			# child.
 	ShowStatus("Connected to ".$RemoteHost);
-	ChildProcess;
+	$SIG{INT} = DEFAULT;
+	sigprocmask(SIG_UNBLOCK, $sigset);
+	ChildProcess;		# Does not return.
     }
 
 }
@@ -1410,6 +1420,7 @@ while (! $HostIterator->end()) {
     CreateChild($hostentryref->[0]);
     $HostIterator->next();
 }
+$RemoteHost = "Parent Server";
 
 # Maintain the population:
 
@@ -1418,8 +1429,10 @@ ShowStatus("Parent keeping the flock");
 #
 #   Set up parent signals:
 #
-$SIG{INT}  = &KillThemAll;
-$SIG{TERM} = &KillThemAll; 
+
+$SIG{INT}  = \&KillThemAll;
+$SIG{TERM} = \&KillThemAll; 
+$SIG{HUP}  = \&Restart;
 
 while(1) {
     $deadchild = wait();
@@ -1432,9 +1445,50 @@ while(1) {
 	CreateChild($deadhost);
     }
 }
+
+=pod
+
+=head1 Restart
+
+Signal handler for HUP... all children are killed and
+we self restart.  This is an el-cheapo way to re read
+the config file.
+
+=cut
+
+sub Restart {
+    KillThemAll;		# First kill all the children.
+    Log("CRITICAL", "Restarting");
+    my $execdir = $perlvar{'lonDaemons'};
+    unlink("$execdir/logs/lonc.pid");
+    exec("$execdir/lonc");
+}
+
+=pod
+
+=head1 KillThemAll
+
+Signal handler that kills all children by sending them a 
+SIGINT.  Responds to sigint and sigterm.
+
+=cut
+
 sub KillThemAll {
+    Debug(2, "Kill them all!!");
+    local($SIG{CHLD}) = 'IGNORE';      # Our children >will< die.
+    foreach $pid (keys %ChildHash) {
+	my $serving = $ChildHash{$pid};
+	Debug(2, "Killing lonc for $serving pid = $pid");
+	ShowStatus("Killing lonc for $serving pid = $pid");
+	Log("CRITICAL", "Killing lonc for $serving pid = $pid");
+	kill('INT', $pid);
+    }
+    Log("CRITICAL", "Killing the master process.");
+    exit
 }
 
+=pod
+
 =head1 Theory
 
 The event class is used to build this as a single process with an