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POWhy is my PHP Socket Server hanging?
 

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  1. POWhy is my PHP Socket Server hanging?
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    <p>I created a PHP Socket Server with PHP_NORMAL_READ mode. So, a message to the server is read when it ends with \n or \r. I tried it by connecting to the server with multiple telnet instances, and it works great.</p> <p>However, when I connect to the server with 1 flash application and 1 telnet application (I first start the flash one), the flash one seems to make the server hang - the server is getting stuck somewhere and no longer receiving data from eg. the telnet client.</p> <p>Because anyone can code a flash client, this has to be fixed server side. The server's code:</p> <pre><code>&lt;?php // config $timelimit = 60; // amount of seconds the server should run for, 0 = run indefintely $port = 9000; // the port to listen on $address = $_SERVER['SERVER_ADDR']; // the server's external IP $backlog = SOMAXCONN; // the maximum of backlog incoming connections that will be queued for processing // configure custom PHP settings error_reporting(1); // report all errors ini_set('display_errors', 1); // display all errors set_time_limit($timelimit); // timeout after x seconds ob_implicit_flush(); // results in a flush operation after every output call //create master IPv4 based TCP socket if (!($master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) die("Could not create master socket, error: ".socket_strerror(socket_last_error())); // set socket options (local addresses can be reused) if (!socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1)) die("Could not set socket options, error: ".socket_strerror(socket_last_error())); // bind to socket server if (!socket_bind($master, $address, $port)) die("Could not bind to socket server, error: ".socket_strerror(socket_last_error())); // start listening if (!socket_listen($master, $backlog)) die("Could not start listening to socket, error: ".socket_strerror(socket_last_error())); //display startup information echo "[".date('Y-m-d H:i:s')."] SERVER CREATED (MAXCONN: ".SOMAXCONN.").\n"; //max connections is a kernel variable and can be adjusted with sysctl echo "[".date('Y-m-d H:i:s')."] Listening on ".$address.":".$port.".\n"; $time = time(); //set startup timestamp // init read sockets array $read_sockets = array($master); // continuously handle incoming socket messages, or close if time limit has been reached while ((!$timelimit) or (time() - $time &lt; $timelimit)) { $changed_sockets = $read_sockets; socket_select($changed_sockets, $write = null, $except = null, null); foreach($changed_sockets as $socket) { if ($socket == $master) { if (($client = socket_accept($master)) &lt; 0) { continue; } else { array_push($read_sockets, $client); } } else { $data = @socket_read($socket, 1024, PHP_NORMAL_READ); //read a maximum of 1024 bytes until a new line has been sent if ($data === false) { //the client disconnected $index = array_search($socket, $read_sockets); unset($read_sockets[$index]); socket_close($socket); } elseif ($data = trim($data)) { //remove whitespace and continue only if the message is not empty echo "we received: ".$data."\n\n"; //handleData($data, $socket); } } } } socket_close($master); //close the socket echo "[".date('Y-m-d H:i:s')."] SERVER CLOSED.\n"; //function to write to the flash client function flash_write($socket, $msg) { socket_write($socket, $msg.chr(0x0)); } ?&gt; </code></pre> <p>Does anyone know what may cause this? I tried changing the timeout on the socket_select from none to 0 (instant return), but that didn't seem to change anything.</p>
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