Re: EPICS Base Release-Candidate Double Feature!

[Andrew Johnson <anj@aps.anl.gov>]

Hi Matt,

On 11/17/2016 09:25 PM, Matt Rippa wrote:
> I can't seem to track down a change to dbGetLinkValue() which is now
> missing from R3.15.
> In R3.14.12.4 it's defined here:
> 
> dbAccessDefs.h: epicsShareFunc long epicsShareAPI dbGetLinkValue(
>     struct link *,short dbrType,void *pbuffer,long *options,long *nRequest);

dbGetLinkValue() was meant to be an internal API; the documented API was
actually a macro called dbGetLink() with the same arguments. Section
15.4.2.2 of the Application Developers Guide says "dbGetLink is
implemented as a macro that calls dbGetLinkValue and can reference its
arguments more than once. The macro skips the call for constant links.
User code should never call dbGetLinkValue."

We have replaced the macro with a function dbGetLink() which is now
declared in dbLink.h and has the same arguments:

> epicsShareFunc long dbGetLink(struct link *, short dbrType, void *pbuffer,
>         long *options, long *nRequest);

This was part of the move to making link-types extensible which will be
coming in Base-3.16.1

HTH,

- Andrew

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