Experimental Physics and
Industrial Control System

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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>