Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 15 Feb 2013 17:16:16 -0600

Hi Emmanuel,

On 2013-02-15 Emmanuel Mayssat wrote:
> I would like to be able to filter PVs from a running IOC based on a tag
> (best candidate may be info record field) Is there a way to do an
> operation equivalent to dbl * where $record.info.my_tag= "foo" > file.pv ?

You could write a command that uses the dbStaticLib API to do that kind of 
thing, but there's nothing built in.  I would start looking at the various 
commands defined in src/db/dbTest.c — dbgrep might be a good place to start.  
You'll also need to read section 14.13 of the AppDevGuide which describes the 
routines that find and access the info items (the rest of chapter 14 should 
also be helpful if you don't know the dbStaticLib API).

Your code will have to scan through the records in the database (which dbgrep 
already does, skipping any record names that don't match the user's pattern) 
and for each record you call dbFindInfo() to look for your tag name.  If that 
tag name exists, you would use dbGetInfoString() to get its value which you 
can then test as you wish.

HTH,

- Andrew
-- 
There is no such thing as a free lunch.  When invited for lunch,
it is best to check if you are there to eat, or to be eaten.
-- Clive Robinson

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System