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)

Answer 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.