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Diff for /loncom/loncnew between versions 1.8 and 1.17

version 1.8, 2003/06/11 02:04:35	version 1.17, 2003/08/03 00:44:31
Line 7	Line 7
# Copyright Michigan State University Board of Trustees	# Copyright Michigan State University Board of Trustees
#	#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).	# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#	## LON-CAPA is free software; you can redistribute it and/or modify
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by	# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or	# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.	# (at your option) any later version.
Line 27	Line 26
# http://www.lon-capa.org/	# http://www.lon-capa.org/
#	#
#	#
# new lonc handles n requestors spread out bver m connections to londs.	# new lonc handles n request out bver m connections to londs.
# This module is based on the Event class.	# This module is based on the Event class.
# Development iterations:	# Development iterations:
# - Setup basic event loop. (done)	# - Setup basic event loop. (done)
Line 41	Line 40
# - Add Configuration file I/O (done).	# - Add Configuration file I/O (done).
# - Add management/status request interface.	# - Add management/status request interface.
# - Add deferred request capability. (done)	# - Add deferred request capability. (done)
	# - Detect transmission timeouts.
#	#

# Change log:	# Change log:
# $Log$	# $Log$
	# Revision 1.17 2003/08/03 00:44:31 foxr
	# 1. Correct handling of connection failure: Assume it means the host is
	# unreachable and fail all of the queued transactions. Note that the
	# inflight transactions should fail on their own time due either to timeout
	# or send/receive failures.
	# 2. Correct handling of logs for forced death signals. Pull the signal
	# from the event watcher.
	#
	# Revision 1.16 2003/07/29 02:33:05 foxr
	# Add SIGINT processing to child processes to toggle annoying trace mode
	# on/off.. will try to use this to isolate the compute boud process issue.
	#
	# Revision 1.15 2003/07/15 02:07:05 foxr
	# Added code for lonc/lond transaction timeouts. Who knows if it works right.
	# The intent is for a timeout to fail any transaction in progress and kill
	# off the sockt that timed out.
	#
	# Revision 1.14 2003/07/03 02:10:18 foxr
	# Get all of the signals to work correctly.
	#
	# 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.
	#
	# Revision 1.10 2003/06/24 02:46:04 foxr
	# Put a limit on the number of times we'll retry a connection.
	# Start getting the signal stuff put in as well...note that need to get signals
	# going or else 6the client will permanently give up on dead servers.
	#
	# Revision 1.9 2003/06/13 02:38:43 foxr
	# Add logging in 'expected format'
	#
# Revision 1.8 2003/06/11 02:04:35 foxr	# Revision 1.8 2003/06/11 02:04:35 foxr
# Support delayed transactions... this is done uniformly by encapsulating	# Support delayed transactions... this is done uniformly by encapsulating
# transactions in an object ... a LondTransaction that is implemented by	# transactions in an object ... a LondTransaction that is implemented by
Line 59 use lib "/home/httpd/lib/perl/";	Line 93 use lib "/home/httpd/lib/perl/";
use lib "/home/foxr/newloncapa/types";	use lib "/home/foxr/newloncapa/types";
use Event qw(:DEFAULT );	use Event qw(:DEFAULT );
use POSIX qw(:signal_h);	use POSIX qw(:signal_h);
	use POSIX;
use IO::Socket;	use IO::Socket;
use IO::Socket::INET;	use IO::Socket::INET;
use IO::Socket::UNIX;	use IO::Socket::UNIX;
	use IO::File;
use IO::Handle;	use IO::Handle;
use Socket;	use Socket;
use Crypt::IDEA;	use Crypt::IDEA;
Line 72 use LONCAPA::LondTransaction;	Line 108 use LONCAPA::LondTransaction;
use LONCAPA::Configuration;	use LONCAPA::Configuration;
use LONCAPA::HashIterator;	use LONCAPA::HashIterator;

print "Loncnew starting\n";

#	#
# Disable all signals we might receive from outside for now.	# Disable all signals we might receive from outside for now.
#	#
$SIG{QUIT} = IGNORE;	#$SIG{QUIT} = IGNORE;
$SIG{HUP} = IGNORE;	#$SIG{HUP} = IGNORE;
$SIG{USR1} = IGNORE;	#$SIG{USR1} = IGNORE;
$SIG{INT} = IGNORE;	#$SIG{INT} = IGNORE;
$SIG{CHLD} = IGNORE;	#$SIG{CHLD} = IGNORE;
$SIG{__DIE__} = IGNORE;	#$SIG{__DIE__} = IGNORE;


# Read the httpd configuration file to get perl variables	# Read the httpd configuration file to get perl variables
Line 97 my %perlvar = %{$perlvarref};	Line 132 my %perlvar = %{$perlvarref};
my %ChildHash; # by pid -> host.	my %ChildHash; # by pid -> host.


my $MaxConnectionCount = 5; # Will get from config later.	my $MaxConnectionCount = 10; # Will get from config later.
my $ClientConnection = 0; # Uniquifier for client events.	my $ClientConnection = 0; # Uniquifier for client events.

my $DebugLevel = 2;	my $DebugLevel = 0;
	my $NextDebugLevel= 10; # So Sigint can toggle this.
my $IdleTimeout= 3600; # Wait an hour before pruning connections.	my $IdleTimeout= 3600; # Wait an hour before pruning connections.

#	#
Line 113 my %ActiveConnections; # Connections to	Line 149 my %ActiveConnections; # Connections to
my %ActiveTransactions; # LondTransactions in flight.	my %ActiveTransactions; # LondTransactions in flight.
my %ActiveClients; # Serial numbers of active clients by socket.	my %ActiveClients; # Serial numbers of active clients by socket.
my $WorkQueue = Queue->new(); # Queue of pending transactions.	my $WorkQueue = Queue->new(); # Queue of pending transactions.
# my $ClientQueue = Queue->new(); # Queue of clients causing xactinos.
my $ConnectionCount = 0;	my $ConnectionCount = 0;
my $IdleSeconds = 0; # Number of seconds idle.	my $IdleSeconds = 0; # Number of seconds idle.
	my $Status = ""; # Current status string.
	my $RecentLogEntry = "";
	my $ConnectionRetries=5; # Number of connection retries allowed.
	my $ConnectionRetriesLeft=5; # Number of connection retries remaining.

#	#
# This disconnected socket makes posible a bit more regular	# The hash below gives the HTML format for log messages
# code when processing delayed requests:	# given a severity.
#	#
my $NullSocket = IO::Socket->new();	my %LogFormats;

	$LogFormats{"CRITICAL"} = "<font color=red>CRITICAL: %s</font>";
	$LogFormats{"SUCCESS"} = "<font color=green>SUCCESS: %s</font>";
	$LogFormats{"INFO"} = "<font color=yellow>INFO: %s</font>";
	$LogFormats{"WARNING"} = "<font color=blue>WARNING: %s</font>";
	$LogFormats{"DEFAULT"} = " %s ";



	=pod

	=head2 LogPerm

	Makes an entry into the permanent log file.

	=cut
	sub LogPerm {
	my $message=shift;
	my $execdir=$perlvar{'lonDaemons'};
	my $now=time;
	my $local=localtime($now);
	my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
	print $fh "$now:$message:$local\n";
	}

	=pod

	=head2 Log

	Logs a message to the log file.
	Parameters:

	=item severity

	One of CRITICAL, WARNING, INFO, SUCCESS used to select the
	format string used to format the message. if the severity is
	not a defined severity the Default format string is used.

	=item message

	The base message. In addtion to the format string, the message
	will be appended to a string containing the name of our remote
	host and the time will be formatted into the message.

	=cut

	sub Log {
	my $severity = shift;
	my $message = shift;

	if(!$LogFormats{$severity}) {
	$severity = "DEFAULT";
	}

	my $format = $LogFormats{$severity};

	# Put the window dressing in in front of the message format:

	my $now = time;
	my $local = localtime($now);
	my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
	my $finalformat = $finalformat.$format."\n";

	# open the file and put the result.

	my $execdir = $perlvar{'lonDaemons'};
	my $fh = IO::File->new(">>$execdir/logs/lonc.log");
	my $msg = sprintf($finalformat, $message);
	$RecentLogEntry = $msg;
	print $fh $msg;


	}

#

=pod	=pod

Line 162 sub Debug {	Line 273 sub Debug {
my $level = shift;	my $level = shift;
my $message = shift;	my $message = shift;
if ($level <= $DebugLevel) {	if ($level <= $DebugLevel) {
print $message." host = ".$RemoteHost."\n";	Log("INFO", "-Debug- $message host = $RemotHost");
}	}
}	}

Line 179 sub SocketDump {	Line 290 sub SocketDump {
=head2 ShowStatus	=head2 ShowStatus

Place some text as our pid status.	Place some text as our pid status.
	and as what we return in a SIGUSR1

=cut	=cut
sub ShowStatus {	sub ShowStatus {
my $status = shift;	my $state = shift;
$0 = "lonc: ".$status;	my $now = time;
	my $local = localtime($now);
	$Status = $local.": ".$state;
	$0='lonc: '.$state.' '.$local;
	}

	=pod

	=head 2 SocketTimeout

	Called when an action on the socket times out. The socket is
	destroyed and any active transaction is failed.


	=cut
	sub SocketTimeout {
	my $Socket = shift;

	KillSocket($Socket);
}	}

=pod	=pod
Line 198 Invoked each timer tick.	Line 328 Invoked each timer tick.
sub Tick {	sub Tick {
my $client;	my $client;
ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount);	ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount);
Debug(6, "Tick");
Debug(6, " Current connection count: ".$ConnectionCount);
foreach $client (keys %ActiveClients) {
Debug(7, " Have client: with id: ".$ActiveClients{$client});
}
# Is it time to prune connection count:	# Is it time to prune connection count:


Line 216 sub Tick {	Line 342 sub Tick {
} else {	} else {
$IdleSeconds = 0; # Reset idle count if not idle.	$IdleSeconds = 0; # Reset idle count if not idle.
}	}
	#
	# For each inflight transaction, tick down its timeout counter.
	#
	foreach $item (keys %ActiveTransactions) {
	my $Socket = $ActiveTransactions{$item}->getServer();
	$Socket->Tick();
	}
# Do we have work in the queue, but no connections to service them?	# Do we have work in the queue, but no connections to service them?
# If so, try to make some new connections to get things going again.	# If so, try to make some new connections to get things going again.
#	#

my $Requests = $WorkQueue->Count();	my $Requests = $WorkQueue->Count();
if (($ConnectionCount == 0) && ($Requests > 0)) {	if (($ConnectionCount == 0) && ($Requests > 0)) {
my $Connections = ($Requests <= $MaxConnectionCount) ?	if ($ConnectionRetriesLeft > 0) {
$Requests : $MaxConnectionCount;	my $Connections = ($Requests <= $MaxConnectionCount) ?
Debug(1,"Work but no connections, starting ".$Connections." of them");	$Requests : $MaxConnectionCount;
for ($i =0; $i < $Connections; $i++) {	Debug(1,"Work but no connections, start ".$Connections." of them");
MakeLondConnection();	for ($i =0; $i < $Connections; $i++) {
	MakeLondConnection();
	}
	} else {
	Debug(1,"Work in queue, but gave up on connections..flushing\n");
	EmptyQueue(); # Connections can't be established.
}	}

}	}
Line 349 sub ClientWritable {	Line 486 sub ClientWritable {

} else { # Partial string sent.	} else { # Partial string sent.
$Watcher->data(substr($Data, $result));	$Watcher->data(substr($Data, $result));
	if($result == 0) { # client hung up on us!!
	Log("INFO", "lonc pipe client hung up on us!");
	$Watcher->cancel;
	$Socket->shutdown(2);
	$Socket->close();
	}
}	}

} else { # Error of some sort...	} else { # Error of some sort...
Line 404 sub CompleteTransaction {	Line 547 sub CompleteTransaction {
my $data = $Socket->GetReply(); # Data to send.	my $data = $Socket->GetReply(); # Data to send.
StartClientReply($Transaction, $data);	StartClientReply($Transaction, $data);
} else { # Delete deferred transaction file.	} else { # Delete deferred transaction file.
&Debug(4, "Deferred transaction complete: ".$Transaction->getFile().	Log("SUCCESS", "A delayed transaction was completed");
" request: ".$Transaction->getRequest().	LogPerm("S:$Client:".$Transaction->getRequest());
" answer: ".$Socket->GetReply());
unlink $Transaction->getFile();	unlink $Transaction->getFile();
}	}
}	}
Line 430 sub StartClientReply {	Line 572 sub StartClientReply {
my $Transaction = shift;	my $Transaction = shift;
my $data = shift;	my $data = shift;


my $Client = $Transaction->getClient();	my $Client = $Transaction->getClient();

&Debug(8," Reply was: ".$data);	&Debug(8," Reply was: ".$data);
Line 466 Parameters:	Line 609 Parameters:

sub FailTransaction {	sub FailTransaction {
my $transaction = shift;	my $transaction = shift;
my $Lond = $transaction->getServer();	Log("WARNING", "Failing transaction ".$transaction->getRequest());
if (!$client->isDeferred()) { # If the transaction is deferred we'll get to it.	Debug(1, "Failing transaction: ".$transaction->getRequest());
my $client = $transcation->getClient();	if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.
StartClientReply($client, "con_lost");	my $client = $transaction->getClient();
	Debug(1," Replying con_lost to ".$transaction->getRequest());
	StartClientReply($transaction, "con_lost\n");
}	}
# not needed, done elsewhere if active.
# delete $ActiveTransactions{$Lond};

}	}

Line 485 sub FailTransaction {	Line 628 sub FailTransaction {
=cut	=cut
sub EmptyQueue {	sub EmptyQueue {
while($WorkQueue->Count()) {	while($WorkQueue->Count()) {
my $request = $Workqueue->dequeue(); # This is a transaction	my $request = $WorkQueue->dequeue(); # This is a transaction
FailTransaction($request);	FailTransaction($request);
}	}
}	}

=pod	=pod

	=head2 CloseAllLondConnections

	Close all connections open on lond prior to exit e.g.

	=cut
	sub CloseAllLondConnections {
	foreach $Socket (keys %ActiveConnections) {
	KillSocket($Socket);
	}
	}
	=cut

	=pod

=head2 KillSocket	=head2 KillSocket

Destroys a socket. This function can be called either when a socket	Destroys a socket. This function can be called either when a socket
Line 515 nonzero if we are allowed to create a ne	Line 672 nonzero if we are allowed to create a ne
sub KillSocket {	sub KillSocket {
my $Socket = shift;	my $Socket = shift;

	Log("WARNING", "Shutting down a socket");
	$Socket->Shutdown();

# If the socket came from the active connection set,	# If the socket came from the active connection set,
# delete its transaction... note that FailTransaction should	# delete its transaction... note that FailTransaction should
# already have been called!!!	# already have been called!!!
Line 608 sub LondReadable {	Line 768 sub LondReadable {
my $State = $Socket->GetState(); # All action depends on the state.	my $State = $Socket->GetState(); # All action depends on the state.

SocketDump(6, $Socket);	SocketDump(6, $Socket);
	my $status = $Socket->Readable();

if($Socket->Readable() != 0) {	&Debug(2, "Socket->Readable returned: $status");

	if($status != 0) {
# bad return from socket read. Currently this means that	# bad return from socket read. Currently this means that
# The socket has become disconnected. We fail the transaction.	# The socket has become disconnected. We fail the transaction.

	Log("WARNING",
	"Lond connection lost.");
if(exists($ActiveTransactions{$Socket})) {	if(exists($ActiveTransactions{$Socket})) {
Debug(3,"Lond connection lost failing transaction");
FailTransaction($ActiveTransactions{$Socket});	FailTransaction($ActiveTransactions{$Socket});
}	}
$Watcher->cancel();	$Watcher->cancel();
Line 657 sub LondReadable {	Line 821 sub LondReadable {
Debug(8,"Completing transaction!!");	Debug(8,"Completing transaction!!");
CompleteTransaction($Socket,	CompleteTransaction($Socket,
$ActiveTransactions{$Socket});	$ActiveTransactions{$Socket});
	} else {
	Log("SUCCESS", "Connection ".$ConnectionCount." to "
	.$RemoteHost." now ready for action");
}	}
ServerToIdle($Socket); # Next work unit or idle.	ServerToIdle($Socket); # Next work unit or idle.

Line 759 sub LondWritable {	Line 926 sub LondWritable {
if ($Socket->Writable() != 0) {	if ($Socket->Writable() != 0) {
# The write resulted in an error.	# The write resulted in an error.
# We'll treat this as if the socket got disconnected:	# We'll treat this as if the socket got disconnected:
	Log("WARNING", "Connection to ".$RemoteHost.
	" has been disconnected");
$Watcher->cancel();	$Watcher->cancel();
KillSocket($Socket);	KillSocket($Socket);
return;	return;
Line 870 sub QueueDelayed {	Line 1038 sub QueueDelayed {
my $Handle = IO::File->new($reqfile);	my $Handle = IO::File->new($reqfile);
my $cmd = <$Handle>;	my $cmd = <$Handle>;
chomp $cmd; # There may or may not be a newline...	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);	my $Transaction = LondTransaction->new($cmd);
$Transaction->SetDeferred($reqfile);	$Transaction->SetDeferred($reqfile);
QueueTransaction($Transaction);	QueueTransaction($Transaction);
Line 898 sub MakeLondConnection {	Line 1066 sub MakeLondConnection {
&GetServerPort());	&GetServerPort());

if($Connection == undef) { # Needs to be more robust later.	if($Connection == undef) { # Needs to be more robust later.
Debug(0,"Failed to make a connection with lond.");	Log("CRITICAL","Failed to make a connection with lond.");
	$ConnectionRetriesLeft--;
	return 0; # Failure.
} else {	} else {
	$ConnectionRetriesLeft = $ConnectionRetries; # success resets the count
# The connection needs to have writability	# The connection needs to have writability
# monitored in order to send the init sequence	# monitored in order to send the init sequence
# that starts the whole authentication/key	# that starts the whole authentication/key
Line 925 sub MakeLondConnection {	Line 1096 sub MakeLondConnection {
if($ConnectionCount == 1) { # First Connection:	if($ConnectionCount == 1) { # First Connection:
QueueDelayed;	QueueDelayed;
}	}
	Log("SUCESS", "Created connection ".$ConnectionCount
	." to host ".GetServerHost());
	return 1; # Return success.
}	}

}	}
Line 1009 sub QueueTransaction {	Line 1183 sub QueueTransaction {
$WorkQueue->enqueue($requestData);	$WorkQueue->enqueue($requestData);
if($ConnectionCount < $MaxConnectionCount) {	if($ConnectionCount < $MaxConnectionCount) {
Debug(4,"Starting additional lond connection");	Debug(4,"Starting additional lond connection");
MakeLondConnection();	if(MakeLondConnection() == 0) {
	EmptyQueue(); # Fail transactions, can't make connection.
	}
}	}
} else { # Can start the request:	} else { # Can start the request:
Debug(8,"Can start...");	Debug(8,"Can start...");
Line 1022 sub QueueTransaction {	Line 1198 sub QueueTransaction {
=pod	=pod

=head2 ClientRequest	=head2 ClientRequest

Callback that is called when data can be read from the UNIX domain	Callback that is called when data can be read from the UNIX domain
socket connecting us with an apache server process.	socket connecting us with an apache server process.

Line 1047 sub ClientRequest {	Line 1222 sub ClientRequest {
close($socket);	close($socket);
$watcher->cancel();	$watcher->cancel();
delete($ActiveClients{$socket});	delete($ActiveClients{$socket});
	return;
}	}
Debug(8,"Data: ".$data." this read: ".$thisread);	Debug(8,"Data: ".$data." this read: ".$thisread);
$data = $data.$thisread; # Append new data.	$data = $data.$thisread; # Append new data.
$watcher->data($data);	$watcher->data($data);
if($data =~ /(.*\n)/) { # Request entirely read.	if($data =~ /(.*\n)/) { # Request entirely read.
	if($data eq "close_connection_exit\n") {
	Log("CRITICAL",
	"Request Close Connection ... exiting");
	CloseAllLondConnections();
	exit;
	}
Debug(8, "Complete transaction received: ".$data);	Debug(8, "Complete transaction received: ".$data);
my $Transaction = LondTransaction->new($data);	my $Transaction = LondTransaction->new($data);
$Transaction->SetClient($socket);	$Transaction->SetClient($socket);
Line 1161 sub SetupLoncListener {	Line 1343 sub SetupLoncListener {
fd => $socket);	fd => $socket);
}	}

	=pod

	=head2 ChildStatus

	Child USR1 signal handler to report the most recent status
	into the status file.

	=cut
	sub ChildStatus {
	my $event = shift;
	my $watcher = $event->w;

	Debug(2, "Reporting child status because : ".$watcher->data);
	my $docdir = $perlvar{'lonDocRoot'};
	my $fh = IO::File->new(">>$docdir/lon-status/loncstatus.txt");
	print $fh $$."\t".$RemoteHost."\t".$Status."\t".
	$RecentLogEntry."\n";
	}

=pod	=pod

	=head2 SignalledToDeath

	Called in response to a signal that causes a chid process to die.

	=cut


	sub SignalledToDeath {
	my $event = shift;
	my $watcher= $event->w;

	Debug(2,"Signalled to death! via ".$watcher->data);
	my ($signal) = $watcher->data;
	chomp($signal);
	Log("CRITICAL", "Abnormal exit. Child $$ for $RemoteHost "
	."died through "."\"$signal\"");
	LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
	."\"$signal\"");
	exit 0;

	}

	=head2 ToggleDebug

	This sub toggles trace debugging on and off.

	=cut

	sub ToggleDebug {
	my $Current = $DebugLevel;
	$DebugLevel = $NextDebugLevel;
	$NextDebugLevel = $Current;

	Log("SUCCESS", "New debugging level for $RemoteHost now $DebugLevel");

	}

=head2 ChildProcess	=head2 ChildProcess

This sub implements a child process for a single lonc daemon.	This sub implements a child process for a single lonc daemon.
Line 1171 This sub implements a child process for	Line 1409 This sub implements a child process for

sub ChildProcess {	sub ChildProcess {

print "Loncnew\n";

# For now turn off signals.	#
	# Signals must be handled by the Event framework...
$SIG{QUIT} = IGNORE;	#
$SIG{HUP} = IGNORE;
$SIG{USR1} = IGNORE;	Event->signal(signal => "QUIT",
$SIG{INT} = IGNORE;	cb => \&SignalledToDeath,
$SIG{CHLD} = IGNORE;	data => "QUIT");
$SIG{__DIE__} = IGNORE;	Event->signal(signal => "HUP",
	cb => \&ChildStatus,
	data => "HUP");
	Event->signal(signal => "USR1",
	cb => \&ChildStatus,
	data => "USR1");
	Event->signal(signal => "INT",
	cb => \&ToggleDebug,
	data => "INT");

SetupTimer();	SetupTimer();

Line 1192 sub ChildProcess {	Line 1437 sub ChildProcess {

# Setup the initial server connection:	# Setup the initial server connection:

&MakeLondConnection();	# &MakeLondConnection(); // let first work requirest do it.


if($ConnectionCount == 0) {
Debug(1,"Could not make initial connection..\n");
Debug(1,"Will retry when there's work to do\n");
}
Debug(9,"Entering event loop");	Debug(9,"Entering event loop");
my $ret = Event::loop(); # Start the main event loop.	my $ret = Event::loop(); # Start the main event loop.

Line 1208 sub ChildProcess {	Line 1450 sub ChildProcess {
# Create a new child for host passed in:	# Create a new child for host passed in:

sub CreateChild {	sub CreateChild {
	my $sigset = POSIX::SigSet->new(SIGINT);
	sigprocmask(SIG_BLOCK, $sigset);
my $host = shift;	my $host = shift;
$RemoteHost = $host;	$RemoteHost = $host;
Debug(3, "Forking off child for ".$RemoteHost);	Log("CRITICAL", "Forking server for ".$host);
sleep(5);
$pid = fork;	$pid = fork;
if($pid) { # Parent	if($pid) { # Parent
	$RemoteHost = "Parent";
$ChildHash{$pid} = $RemoteHost;	$ChildHash{$pid} = $RemoteHost;
	sigprocmask(SIG_UNBLOCK, $sigset);

} else { # child.	} else { # child.
ShowStatus("Connected to ".$RemoteHost);	ShowStatus("Connected to ".$RemoteHost);
ChildProcess;	$SIG{INT} = DEFAULT;
	sigprocmask(SIG_UNBLOCK, $sigset);
	ChildProcess; # Does not return.
}	}

}	}
Line 1257 open (PIDSAVE, ">$execdir/logs/lonc.pid"	Line 1505 open (PIDSAVE, ">$execdir/logs/lonc.pid"
print PIDSAVE "$$\n";	print PIDSAVE "$$\n";
close(PIDSAVE);	close(PIDSAVE);



if (POSIX::setsid() < 0) {	if (POSIX::setsid() < 0) {
print "Could not create new session\n";	print "Could not create new session\n";
exit -1;	exit -1;
Line 1264 if (POSIX::setsid() < 0) {	Line 1514 if (POSIX::setsid() < 0) {

ShowStatus("Forking node servers");	ShowStatus("Forking node servers");

	Log("CRITICAL", "--------------- Starting children ---------------");

my $HostIterator = LondConnection::GetHostIterator;	my $HostIterator = LondConnection::GetHostIterator;
while (! $HostIterator->end()) {	while (! $HostIterator->end()) {

Line 1271 while (! $HostIterator->end()) {	Line 1523 while (! $HostIterator->end()) {
CreateChild($hostentryref->[0]);	CreateChild($hostentryref->[0]);
$HostIterator->next();	$HostIterator->next();
}	}
	$RemoteHost = "Parent Server";

# Maintain the population:	# Maintain the population:

ShowStatus("Parent keeping the flock");	ShowStatus("Parent keeping the flock");

	#
	# Set up parent signals:
	#

	$SIG{INT} = \&Terminate;
	$SIG{TERM} = \&Terminate;
	$SIG{HUP} = \&Restart;
	$SIG{USR1} = \&CheckKids;

while(1) {	while(1) {
$deadchild = wait();	$deadchild = wait();
if(exists $ChildHash{$deadchild}) { # need to restart.	if(exists $ChildHash{$deadchild}) { # need to restart.
$deadhost = $ChildHash{$deadchild};	$deadhost = $ChildHash{$deadchild};
delete($ChildHash{$deadchild});	delete($ChildHash{$deadchild});
Debug(4,"Lost child pid= ".$deadchild.	Log("WARNING","Lost child pid= ".$deadchild.
"Connected to host ".$deadhost);	"Connected to host ".$deadhost);
	Log("INFO", "Restarting child procesing ".$deadhost);
CreateChild($deadhost);	CreateChild($deadhost);
}	}
}	}



	=pod

	=head1 CheckKids

	Since kids do not die as easily in this implementation
	as the previous one, there is no need to restart the
	dead ones (all dead kids get restarted when they die!!)
	The only thing this function does is to pass USR1 to the
	kids so that they report their status.

	=cut

	sub CheckKids {
	Debug(2, "Checking status of children");
	my $docdir = $perlvar{'lonDocRoot'};
	my $fh = IO::File->new(">$docdir/lon-status/loncstatus.txt");
	my $now=time;
	my $local=localtime($now);
	print $fh "LONC status $local - parent $$ \n\n";
	foreach $pid (keys %ChildHash) {
	Debug(2, "Sending USR1 -> $pid");
	kill 'USR1' => $pid; # Tell Child to report status.
	sleep 1; # Wait so file doesn't intermix.
	}
	}

	=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
	SIGHUP. 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 'QUIT' => $pid;
	delete($ChildHash{$pid});
	}
	my $execdir = $perlvar{'lonDaemons'};
	unlink("$execdir/logs/lonc.pid");

	}

	=pod

	=head1 Terminate

	Terminate the system.

	=cut

	sub Terminate {
	KillThemAll;
	Log("CRITICAL","Master process exiting");
	exit 0;

	}
	=pod

=head1 Theory	=head1 Theory

The event class is used to build this as a single process with an	The event class is used to build this as a single process with an

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>

Removed from v.1.8
changed lines
	Added in v.1.17