PHP Fatal error: Uncaught exception 'ZMQSocketException' with message 'Failed to send message: Interrupted system call'

[cmosguy]

I am not sure what I could possibly be doing wrong here. I am implementing a simple zmq message into my ratchet websocket framework.

I am getting the error message:

PHP Fatal error:  Uncaught exception 'ZMQSocketException' with message 'Failed to send message: Interrupted system call'

Not sure what I am doing wrong here. Here is the server code:

  //Listen for web server to make ZeroMQ push after an ajax request
        $context = new Context($loop);

        $pull = $context->getSocket(\ZMQ::SOCKET_PULL);
        $pull->bind(\Config::get('squarekings.zmqserver') . ':' . $port); // Binding to 127.0.0.1 means the only client that can connect is itself
        $pull->on('message', array($pusher, 'onGameUpdate'));
        $pull->on('square', array($pusher, 'onSquareUpdate'));

        // Set up our WebSocket server for clients wanting real-time updates
        $webSock = new Server($loop);
        $webSock->listen(8080, '0.0.0.0'); // Binding to 0.0.0.0 means remotes can connect
        $webServer = new IoServer(
            new HttpServer(
                new WsServer(
                    new WampServer(
                        $pusher
                    )
                )
            ),
            $webSock
        );

Then when i am trying to send the message or update for the request I have the following:

  $this->socket = $context->getSocket(\ZMQ::SOCKET_PUSH, 'my pusher');
            $this->socket->connect(\Config::get('squarekings.zmqserver') . ":" . \Config::get('squarekings.zmqport'));
 $this->socket->send(json_encode($arr));

I don't understand how to debug this and what is going on with the handling of the ZMQ messages. Can someone please advise how I could fix this issue?

Thanks!

[mkoppanen]

Does this happen every time you send or when terminating the program (for example CTRL+C)?

[cmosguy]

Hi @mkoppanen, thanks for getting back to me.

This is happening when i am running my script from a command line tool called tinker . I have not tried it from a script or anything like that, just from this interactive shell. I am assuming the same results if I use it from the script.

Is there a way to debug this? What is going on behind the scenes with zmq to result this error do you think?

Thanks

[maxymajzr]

It's not ZMQ's fault in this case, it's most likely something that the mentioned utility does. Is it forking at any point?

[cmosguy]

@Majeh and @mkoppanen looks like you guys are right. It isn't ZMQ, it is the stupid tinker system I am using that is screwing things up. I should have tested this with an isolated test in a script. Thanks for your help!

[Rastusik]

@mkoppanen I have the same problem when using ZMQ with Swoole (which seems to fork php processes) ... Is this extension compatible with such a use case?

[duckboy81]

Not to turn this into stackoverflow, but for future folks finding themselves here, you may seek to reorganize your code to bind or connect AFTER your fork occurs.

Moving my $rep->connect("ipc://" . self::ZQM_SOCKET_PATH); to a function call after I forked has solved the problem.

[Rastusik]

yeah, I figured that as well, but I think, that that's just a workaround, isn't it?