PHP - error when using socket_recv

Question

I have a socket error when running the socket_recv inside this function:

function readByteXByteSIBmsg() {
    $msg = "";
    $buf="";
    try {
     while( $ret=socket_recv($this->kpSocket,$buf,8192,0)){
        $msg.=$buf;
        if($ret<8192) break;
     }


    $this->deb_print("KpCore:readByteXByteSIBmsg:READ LOOP TERMINATED");
    } catch (Exception $e) {
        err_print("KPICore:readByteXByteSIBmsg:Exception on EVENT  HANDLER:RECEIVE:\n" . $e);
        $this->$KP_ERROR_ID = $this->ERR_SOCKET_TIMEOUT;
    }
    return $msg;
}

This is the text of the error:

PHP Warning:  socket_recv(): unable to read from socket [11]: Resource temporarily unavailable in /home/luca/Documenti/Tesi/M3 Agent Page/lib/KPICore.php on line 236

(line 236 is the line with the socket_recv call)

Some programmer dude · Accepted Answer · 2012-07-23 10:20:18Z

1

The error is EAGAIN (or EWOULDBLOCK, sometimes those are the same error) and means that the socket is non-blocking and that there is nothing to read at the moment. You can busy-wait while you have that error until you read something, or you use some other method to find out if there is data to read before trying to receive.

answered Jul 23, 2012 at 10:20

Some programmer dude

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3 Comments

i336_ Over a year ago

Been a few years, but I'm curious. How exactly might I go about using "some other method to find out if there is data to read"?

Some programmer dude Over a year ago

@i336_ select comes to mind. :)

i336_ Over a year ago

D'oh. Of course. Yeah, I didn't fully grasp the "oh if you get EAGAIN you just fall back into select() and let it tell you" thing initially... heh. Thanks :)

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