Experimental Physics and
Industrial Control System

Dirk Zimoch via Core-talk <core-talk at aps.anl.gov> · Mon, 06 Jul 2020 13:42:19 -0000

Finally put is fixed as well. I changed dbPut to set the target to INVALID/LINK if the target is a scalar and 0 elements are put. Only the target record goes to alarm state, not the sending record.
The target is then processed normally if the link is PP, as before only that before if was processed with no alarm and value 0.

If the target happens to be an array of max length 1, it is set to an empty array and not to alarm. For that I always use now the array implementation if the target is a SPC_DBADDR field with array_info(), even if the target has only 1 element. That allowed me to streamline the dbPut code a bit.

This change works for db links, CA links and as well for `caput -a 0` (empty array put) to a scalar field. Is it ok to call this case a "LINK_ALARM"? I cannot really distinguish between caput and any other put in dbPut. An alternative would be to check the target in the CA server and report an error to the caller when trying to put an empty array into a scalar. But that would probably affect CA links as well and generate an error in the sending record.
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https://code.launchpad.net/~dirk.zimoch/epics-base/+git/epics-base/+merge/386175
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System