* VMS Ada from C questions
@ 1993-06-02 22:49 Scott Moody
0 siblings, 0 replies; 2+ messages in thread
From: Scott Moody @ 1993-06-02 22:49 UTC (permalink / raw)
Does anyone have experience calling VMS Ada from C?
I can't seem to the the argument sizes correct, or
the argument passing mechanism.
There is a pragma export_procedure, but nothing to
tell the passing mechanism.
Now I can call C from Ada, and tell it to pass by value,
but there isn't a export version.
Anyone use VMS Ada as a non-main program??
Thanks..
--
Scott Moody (206) 773-4313 "There are no answers .. just cross references"
scott@shuksan.boeing.com
uunet!bcstec!shuksan!scott
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: VMS Ada from C questions
@ 1993-06-03 13:31 Bevin R. Brett
0 siblings, 0 replies; 2+ messages in thread
From: Bevin R. Brett @ 1993-06-03 13:31 UTC (permalink / raw)
In article <C80nEy.AvJ@shuksan.ds.boeing.com>, scott@shuksan.ds.boeing.com (Sco
tt Moody) writes...
>Does anyone have experience calling VMS Ada from C?
>
>I can't seem to the the argument sizes correct, or
>the argument passing mechanism.
>
>There is a pragma export_procedure, but nothing to
>tell the passing mechanism.
>
>Now I can call C from Ada, and tell it to pass by value,
>but there isn't a export version.
>
>Anyone use VMS Ada as a non-main program??
>
>Thanks..
>
>--
>Scott Moody (206) 773-4313 "There are no answers .. just cross references"
> scott@shuksan.boeing.com
> uunet!bcstec!shuksan!scott
--
The V3.0 version of DEC Ada for OpenVMS VAX Systems, and for OpenVMS AXP system
s
both support specifying mechanism and result_mechanism in the Export_[proc|func
]
pragmas with the same syntax as the Import_[proc|func] pragmas.
You should have this version installed by now, it has been out for quite a
while. [The VAX version is also the one that supports Smart Recompilation, if
you get the Professional Development Option].
Prior to that, the only way was (a) have the C code pass a pointer, to get
Reference semantics, or (b) gross hacks involving taking the address of a
in parameter of a large record type and unchecked_converting it to Integer [or
whatever].
--
To see how to use Ada units as a non-main program, look up ACS EXPORT in the
Developing Ada Programs manual.
--
/Bevin
DEC Ada team
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