Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Sun, 6 Jul 2008 09:41:58 -0500

Is it possible that the "too many open files" has nothing to do with CA, but is rather due to not properly closing the text files you open?

Mark

________________________________

From: [email protected] on behalf of Bertrand H.J. Biritz
Sent: Sat 7/5/2008 9:13 PM
To: [email protected]
Subject: CAC: unable to create virtual circuit b/c "Too many open files" 

Dear Tech-talk,

I wrote a monitoring program using some of the example code from EPICS-
BASE and the lecture videos. It connects to an IOC every 5 minutes for 
12 PV's and write their values to a text file.

The only problem is that it eventually fails with the following error 
message:

epicsSocketEnablePortUseForDatagramFanout: unable to set SO_REUSEADDR?
epicsSocketDestroy: failed to close a socket because "Bad file 
descriptor"
CAC: unable to create virtual circuit because "Too many open files"

the last line is repeated multiple times.

Now the relevant code snippet is:

while(1)
{
...
...
...
       /*
        * Here is where the CA calls happen
        */

       /* Initialize */

  status=ca_context_create(ca_disable_preemptive_callback);
       if(status != ECA_NORMAL)
        {
          printf("ca_context_create failed:\n%s\n",ca_message(status));
          exit(1);
        }

       /* Search */

       for(i = 0; i < 12; i++)
        {

status
=
ca_create_channel
(pv[i],connectionChangedCB,NULL,CA_PRIORITY_DEFAULT,&pCh[i]);
          if(status != ECA_NORMAL)
            {
              printf("ca_create_channel for pv%d failed:\n%s\n", i, 
ca_message(status));
              exit(1);
            }
        }

       /* Wait */
       startTime=curTime;
       ca_pend_event(timeout);

       /* Clear the channel */

       for(i = 0; i < 12; i++)
        {
          status=ca_clear_channel(pCh[i]);
          if(status != ECA_NORMAL)
            {
              printf("ca_clear_channel for pv%d failed:\n%s\n", i, 
ca_message(status));
            }
        }

       /* Exit */

       ca_context_destroy();
...
...
...
}

I thought I had included everything I need, but apparently I missed 
something.

Any help would be greatly appreciated,
Bertrand

Happy post July 4th!

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System