From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,5edee74b13d8e50a
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!feeder.erje.net!news2.arglkargh.de!news.n-ix.net!news.belwue.de!rz.uni-karlsruhe.de!feed.news.schlund.de!schlund.de!news.online.de!not-for-mail
From: michael bode <m.g.bode@web.de>
Newsgroups: comp.lang.ada
Subject: Re: The "black magic" of ioctl
Date: Sat, 23 Oct 2010 15:27:38 +0200
Organization: Evangelisches Atomkraftwerk =?ISO-8859-1?Q?M=FClheim-K=E4rl?=
 =?ISO-8859-1?Q?ich?=
Message-ID: <i9unse$1f7$1@online.de>
References: 
 <acb50562-4a4b-42ee-bfa8-d65c182831d8@c20g2000yqj.googlegroups.com>
	<74b46743-fb81-48cc-a478-ffd069db2fc6@k22g2000yqh.googlegroups.com>
	<cbc04455-d43b-4cca-ab56-51b6273fdc08@j18g2000yqd.googlegroups.com>
	<i9sre1$21t$1@online.de> <m2k4l92jl7.fsf@pushface.org>
NNTP-Posting-Host: p5b24a923.dip0.t-ipconnect.de
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: online.de 1287840462 1511 91.36.169.35 (23 Oct 2010 13:27:42 GMT)
X-Complaints-To: abuse@einsundeins.com
NNTP-Posting-Date: Sat, 23 Oct 2010 13:27:42 +0000 (UTC)
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
 rv:1.9.2.11) Gecko/20101006 Thunderbird/3.1.5
In-Reply-To: <m2k4l92jl7.fsf@pushface.org>
Xref: g2news1.google.com comp.lang.ada:14694
Date: 2010-10-23T15:27:38+02:00
List-Id: <comp.lang.ada>

Am 23.10.2010 14:13, schrieb Simon Wright:
> michael bode <m.g.bode@web.de> writes:
> 
>>       if 0 = Ioctl (Device.Fd, VIDIOC_QUERYCAP, C_Cap'access) then
> 
> I recognise the point of this to-me totally counter-intuitive convention
> in C, really not needed in Ada! (or Python ..)

You mean functions returning error codes? Or putting 0 on the left side
of the equality operator? Calling C functions from Ada is writing C in
Ada syntax. Therefore you hide it in a package that looks like Ada to
the outside.