Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Wed, 27 Jul 2022 08:30:05 -0700

On 7/26/22 16:53, Wang, Andrew via Tech-talk wrote:

Update. I think I got it. I had to do the following.

static long func(aSubRecord *prec)

{

         DBLINK inpa = prec->inpa;

Be aware that 'inpa.value' is a C union.

So it is strongly recommended to test 'prec->inp.type' before accessing.
In this case you are assuming that 'prec->inp.type==DB_LINK'.

                 char *rec_name = inpa.value.pv_link.pvname;

                 printf(“Record name in INPA is %s\n”, rec_name);

Also, what motivates this?  Have you found an operation that
isn't covered by the link abstraction?

                 return 0;

}

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*From:* Wang, Andrew
*Sent:* Tuesday, July 26, 2022 4:17 PM
*To:* EPICS tech-talk <tech-talk at aps.anl.gov>
*Subject:* Retrieving record name from aSub input/output fields

Hi all,

Quick question this time. I was wondering if there was a way to retrieve the name of the record referenced in an OUTLINK/INLINK field such as INPA, OUTA, etc. in the aSub routine.

For instance, suppose I had an aSub record such as the following.

record(aSub, “example”)

{

                 field(SNAM, “func”)

                 field(INPA,   “rec_in_inpa”)

}

I would like to be able to print the name of the record in INPA within “func”.

static long func(aSubRecord *prec)

{

                 char *rec_name = prec->____;

                 printf(“Record name in INPA is %s\n”, rec_name);

                 return 0;

}

Thanks,

Andy

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System