From: Poul-Erik Andreasen <poulerik@pea.dk>
Subject: Re: binding to C: popen
Date: Tue, 21 Feb 2006 17:16:11 +0100
Date: 2006-02-21T17:16:11+01:00 [thread overview]
Message-ID: <43fb3ccb$0$169$edfadb0f@dread11.news.tele.dk> (raw)
In-Reply-To: <43fb374a$0$13593$9b4e6d93@newsread2.arcor-online.net>
Georg Bauhaus wrote:
> Poul-Erik Andreasen wrote:
>
>
>>Yes but a C pointer is in Ada represented as system.address and i can
>>not test that for O the the systems.address_image gives 0804C060 and if
>>that is a stadart c value for a null-pointer things are fine, but that
>>seems to be a hack.
>
>
> System.Null_Address, or Interfaces.C.Strings.Null_Ptr perhaps?
>
> You could consider writing a predicate like
>
> fucntion is_null(p: System.Address) return Boolean;
>
> in order to have the comparison in one place only.
>
> HTH,
> Georg
In the meantime i have found out that i will not help much. The
null-pointer return will only occur if there is a internal error, and
since sh normaly will succed even if the command fails it somthing that
rarely occurs. I can not even find out a way to test it.
Poul-Erik
next prev parent reply other threads:[~2006-02-21 16:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-21 14:37 binding to C: popen Poul-Erik Andreasen
2006-02-21 15:25 ` jimmaureenrogers
2006-02-21 15:45 ` Poul-Erik Andreasen
2006-02-21 15:52 ` Georg Bauhaus
2006-02-21 16:16 ` Poul-Erik Andreasen [this message]
2006-02-21 16:12 ` Alex R. Mosteo
2006-02-21 23:51 ` Jeffrey R. Carter
2006-02-22 13:50 ` Marc A. Criley
2006-02-23 1:10 ` poulerik
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