Callback procedures in DEC Ada83

[Stephen Bleasdale <sd@eateggs.demon.co.uk>]

Hi,

Here's my question:

I would like to write callback routines in Ada83 using DEC Ada 3.0 on VAX/VMS.

I have used e.g. LIB$FILE_SCAN so I know how to use 'ADDRESS to supply callback
subprograms for use by existing routines. What I'd to do is actually call a
callback routine in my program.

I know this is not possible in vanilla Ada83, but ISTR once reading that most
implementations provide a non-portable way of doing this sort of thing.

I guess what I'm hoping for is that somewhere amongst all the DEC provided
routines is something of the form:

   procedure CALL_PROCEDURE ( ADDR : in SYSTEM.ADDRESS ) ;

---

Thanks in advance.

Stephen Davies <sd@eateggs.demon.co.uk>