Problem with sockets not closing

EyeDentify · 03-17-2010, 08:10 PM

Hello my PHP gurus.

I have something for you to sink your teeth into.

let me show you my code im working with:

PHP Code:


			
<?PHP

/* Simple Socket Server v1.0 */



    // set some variables

    $host = gethostbyname(gethostname());

    $port = 9996;

    

    // don't timeout!

    set_time_limit(0);

    

    // create socket

    $socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");

        

    // bind socket to port

    $result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");

    

    // start listening for connections

    $result = socket_listen($socket, 3) or die("Could not set up socket listener\n");

    socket_set_block($socket);

    

    echo("Waiting for socket connection on " . $host . ":" . $port . "\n\r");

    

    // accept incoming connections

    // spawn another socket to handle communication

    

    $socketAccept = '';

    $socketAccept = socket_accept($socket) or die("Could not accept incoming connection\n");

    

    echo("Incomming connection accepted!\n\r");

    

    // Make a file to save incoming socket data to

    $randFileName = 'test_' . md5(mt_rand(0, 1000) ) . '.test';

    $inFileHandle = fopen($randFileName, 'wb');

    

    while(!$input == '')

    {

        // read client input

        $input = socket_read($socketAccept, 1024) or die("Could not read input\n\r");

        

        // save data to file

        fwrite($inFileHandle, $input, 1024);

    

    }

    

    // close file handle

    fclose($inFileHandle);

    

    echo("Socket file data read and saved to\n\r" . $randFileName . "\n\r");

            

    

    // shut down sockets

    /*

    socket_shutdown($socketAccept, 2);

    socket_shutdown($socket, 2);

    */

    

    // close sockets

    socket_close($socketAccept);

    socket_close($socket);

    

    echo("Sockets closed!\n\r\n\r");

    

    

?>

This script works the first time it´s run and my client script on another computer sends data and this server script saves it to a file. And all is well.

Now.. the problem is that when i want to run the server script again and try to send data to it with my client script. The client script gives the error that a connection on the server script is blocking the socket_write() function in my client script.

It would seem that the socket first opened the first run on the server script is still open and wont accept new connections.

I can´t get whats wrong. Im really looking for your advice.

By request i can post the client script also, but i don´t think its where the problem lies.

Sorry for the english :)

Note:
- I am running the script from Win7 command line via the php.exe executible.

Thank you in advance.

helenk579 · 05-25-2010, 01:13 AM

Thanks you for the post.

<I'm a sucky spammer so now I'm banned; no link juice for me>

nefus · 05-25-2010, 02:11 PM

Oh.. I'd like to know the answer to this as well.

Village Idiot · 05-25-2010, 07:11 PM

This thread is ancient, the above post is fake sig (link spam).

nefus · 05-25-2010, 07:20 PM

Awww bummer. I didn't notice that. Still, does anyone know the basic answer to this?

core1024 · 05-26-2010, 09:05 AM

I've tested it and the result is following

Code:

~/test$ php5 srv.php 
Waiting for socket connection on 127.0.1.1:9996
Incomming connection accepted!
Socket file data read and saved to
test_b4288d9c0ec0a1841b3b3728321e7088.test
Sockets closed!

 
~/test$ pgrep -lf php
~/test$ netstat -n| grep 9996
tcp        0      0 127.0.1.1:9996          127.0.1.1:49404         TIME_WAIT  
~/test$

After the script terminates there is not zombie process. In netstat manual says that TIME_WAIT means that after the socket is closed the port is still waiting for not delivered packets. I am not sure what is causing it, but for sure it is a parameter to be set.

nefus · 05-26-2010, 01:35 PM

Interesting.