Problems with other link types
As well as hardware addresses, link.h currently defines:
PV links, which resolve to one of:
Constant values
- which cannot be checked by the DCTs because only the record support code knows which field they initialize and hence their native type.
These links are very different to device support. They transport one value (+ alarms), and know nothing about the record they live in.
Forward links are implemented as special kinds of PV links, although their behaviour is different.