subroutine, chaning links

[Mathias Steiner <steiner@nscl.msu.edu>]

Learned Friends:

I am looking for ways to dynamically create and destroy beamlines by 
stringing together individual magnets.  That's how we do it from inside 
a C program currently, and it works for what we do.  Now I'd like to do 
it using EPICS records.

All would be well if it were possible to change links -- either .FLNK or 
.OUT -- from within a subroutine.  I've tried a couple of things without 
success.  Just pasting the channel name into the "value" field of the 
union does not, and probably should not, work.

Assigning a different value to a link by copying an input link doesn't 
work either:
psub->flnk = psub->inpb;

This isn't so clear to me, since they are both of type DBLINK.  After 
all, I can "just" type the value into the .FLNK field of any channel 
using edm, and it'll work...

Does anyone have a suggestion?  Or a comment?

Thanks in advance
-Mathias