Experimental Physics and
Industrial Control System

[email protected] · Wed, 25 Nov 2015 20:07:46 +0100 (CET)

Hello all, Dirk,

I've found a bug in StreamDevice asynDriver code. In my case, whenever the remote TCP host closes connection, a thread in EPICS will enter an infinite loop, the connection failure will never be reported, and reconnection will never be attempted. I've tracked it down to this code in AsynDriverInterface.cc:

// now, we can write (called by asynManager)
void AsynDriverInterface::
writeHandler()
{
...
    } while (status != asynTimeout);
...

I observed that the read returns asynError and this loop continues forever. I was able to fix it by changing this line to:

    } while (status != asynTimeout && status != asynError);

Now it appears to be working correctly, the connection error is reported and reconnection works.

Best regards,
Ambroz Bizjak

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System