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From: dennison@telepath.com
Subject: Re: Importing a Unix function call
Date: 1998/12/04
Message-ID: <749q8c$2kn$1@nnrp1.dejanews.com>#1/1
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Date: 1998-12-04T00:00:00+00:00
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In article <36683FA3.2512DECF@ndirect.co.uk>,
  Steve Crowe <stevecrowe@ndirect.co.uk> wrote:
> Someone has bound to have done this before... hopefully.
>
> Using Ada to import a function is easy, but if the function parameter
> returns
> a value, how is the Ada error overcome.  As I want the return value as
> well
> as the out parameter.  Is there away round this using a pragma?
>
> GNAT AdA compiler running under Unix, the function being imported is a
> Unix 'pipe'.

If you are using gnat, you can use pragma Import_Valued_Procedure.

The portable way around this problem is to pass the parameters the same way C
does: all "in"s, with some being pointer objects. C doesn't have "out"
parameters either, you know.

--
T.E.D.

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