Help with sockets - socket_accept killing script?

kristopherWindsor · September 25, 2009

My script seems to work, if someone connects to the script a few seconds after I call socket_accept. But if I wait 20 seconds or so before launching the client, then the client doesn't connect properly, and the script ends about 5 seconds later.

That is, whether the client connects 20 seconds after the script calls socket_accept, or 2 minutes after, the script doesn't terminate until shortly after the client tries to connect. And the script isn't supposed to be terminating. I have turned all the error reporting on, but I get no error when it terminates, and I know my script isn't ending properly.

If I connect quickly, the script runs and terminates properly. Any ideas why the client needs to connect quickly for this to work, or how it can be fixed?

Here's my script FWIW:

<?php

// (C) 2009 Kristopher Windsor

error_reporting(E_ALL);

$MAX_CLIENTS = 8;
$clients = array(null, null, null, null, null, null, null); // sockets; null -> not open; client set to null if error
$connection = array();

function start ()
{
set_time_limit(60 * 10);
echo '<html><body>';
echo 'Kristopher Windsor\'s game server v1.0<br><br>';
}

function finish ($m)
{
die("$m<br>The server has finished. If it completed successfully, it will restart automatically.</body></html>");
}

function open ()
{
global $clients, $connection;

echo 'Opening port ' . $connection['port'] . ' on ' . $connection['ip'] . ' (timestamp ' . time() . ')<br>';

$connection['socket'] = socket_create(AF_INET, SOCK_STREAM, 0);
if ($connection['socket'] === false ||
	!socket_bind($connection['socket'], $connection['ip'], $connection['port']) ||
	!socket_listen($connection['socket'], 3))

	finish('Error: the port is in use (the server is probably already running)');

echo 'Waiting for clients<br>';

for ($i = 0; $i < $connection['clients']; $i ++)
	{
	$clients[$i] = socket_accept($connection['socket']);
	dispatch('Player ' . ($i + 1) . ' of ' . $connection['clients'] . ' connected');
	}

echo 'Clients connected<br>';
}

function close ()
{
global $clients, $connection;

socket_shutdown($connection['socket'], 2);
socket_close($connection['socket']);
}

function relay ()
{
global $clients, $connection;

foreach ($clients as $c => $oneclient)
	{
	if ($oneclient == null)
		continue;

	socket_clear_error();
	$chunk = socket_read($oneclient, 1024);
	checkconnection($c);

	if (trim($chunk) == '')
		continue;

	$chunk = str_replace("\n", ' ', $chunk);
	$chunk = str_replace("\r", ' ', $chunk);
	$message = explode(' ', $chunk);

	foreach ($message as $i => $m)
		if (trim($m) != '')
			dispatch(($c + 1) . trim($m));
	}
}

function dispatch ($m)
{
global $clients, $connection;

echo "Sending message: $m<br>";

foreach ($clients as $c => $oneclient)
	{
	if ($oneclient == null)
		continue;

	socket_clear_error();
	socket_write($oneclient, $m . "\n", strlen($m) + 1);
	checkconnection($c);
	}
}

function checkconnection ($c)
{
global $clients, $connection;

if ($clients[$c] == null || socket_last_error() != 104)
	return;

socket_close($clients[$c]);
$clients[$c] = null;
dispatch('Player ' . ($c + 1) . ' closed the connection');
dispatch('END');
}

function connectedclients ()
{
global $clients, $connection;

$r = 0;
foreach ($clients as $c => $oneclient)
	if ($oneclient != null)
		$r ++;

return $r;
}

start();
if (!isset($_GET['port']) || !isset($_GET['clients']))
finish('Please specify the port and clients.');

$connection['ip'] = "...[removed]...";

$connection['port'] = $_GET['port'];
if ($connection['port'] < 1000 || $connection['port'] > 50000)
finish('Please select a better port number');

$connection['clients'] = $_GET['clients'];
if ($connection['clients'] < 1 || $connection['clients'] > $MAX_CLIENTS)
finish('Please select a better number of clients');

open();
do
{
relay();
usleep(1000 * 1000 / 50); // 50th of second
} while (connectedclients() > 0);
close();

finish('<script>setTimeout(\'location.href = "server.php?port=' . $connection['port'] .
'&clients=' . $connection['clients'] . '"\', 5000)</script>');

?>

kristopherWindsor · September 27, 2009

*bump*

redarrow · September 27, 2009

is there any setting in the php.ini then?

don't no nothing on sockets bro....

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Help with sockets - socket_accept killing script?

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