Experimental Physics and
Industrial Control System

I get the following error loading a library file on vxWorks/Epics 3.14.4:

 

 

 

cd timingbin

value = 0 = 0x0

ld<timingLib.munch

Undefined symbol: p (binding 1 type 0)  <<<<<<<<<<<<<<<<<<<<<

value = 28536800 = 0x1b36fe0

cd timing

value = 0 = 0x0

dbLoadDatabase("dbd/timing.dbd",0,0)

value = 0 = 0x0

timing_registerRecordDeviceDriver(pdbbase)

 

program

Exception current instruction address: 0x01b47334

Machine Status Register: 0x0008b030

Condition Register: 0x44200082

Task: 0x1b51b18 "tShell"

 

In timing.dbd I have:

……

driver (drvV124S)

 

device (ai,       VME_IO,   devAiV124S,      "Timing Gate")

…….

#registrar("timingSubs") <<<<<<<<<<<<<<<<<<<<< Commented out

 

And from that   registerRecordDeviceDriver.pl  generates:

 

……

epicsShareExtern void (*p)(void);   <<<<<<<<<<<<<<<<<<<<<<<<

 

int timing_registerRecordDeviceDriver(DBBASE *pbase)

{

    int i;

    for(i=0; i< 11;  i++ ) {

        if(registryDeviceSupportFind(deviceSupportNames[i])) continue;

        if(!registryDeviceSupportAdd(deviceSupportNames[i],devsl[i])) {

            errlogPrintf("registryDeviceSupportAdd failed %s\n",

                deviceSupportNames[i]);

            continue;

        }

    }

    for(i=0; i< 1;  i++ ) {

        if(registryDriverSupportFind(driverSupportNames[i])) continue;

        if(!registryDriverSupportAdd(driverSupportNames[i],drvsl[i])) {

            errlogPrintf("registryDriverSupportAdd failed %s\n",

                driverSupportNames[i]);

            continue;

        }

    }

    (*p)();   <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

    return(0);

}

 

…

 

The call to (*p)() generates the bus error and the unresolved link error.

The registrar line was commented out since I hadn’t actually completed the registrar function for that source file.  Apparently some pass that registerRecordDeviceDriver.pl made on the dbd file counted the line has having a registrar spec but didn’t pick up its argument.  The work around is to misspell “registrar”.