From owner-freebsd-hackers@FreeBSD.ORG  Tue Jun  6 01:00:57 2006
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id DD1FD16E587
	for <freebsd-hackers@freebsd.org>; Tue,  6 Jun 2006 00:08:35 +0000 (UTC)
	(envelope-from pieter@degoeje.nl)
Received: from smtp.utwente.nl (smtp1.utsp.utwente.nl [130.89.2.8])
	by mx1.FreeBSD.org (Postfix) with ESMTP id D5F0643D58
	for <freebsd-hackers@freebsd.org>; Tue,  6 Jun 2006 00:08:34 +0000 (GMT)
	(envelope-from pieter@degoeje.nl)
Received: from nox.student.utwente.nl (nox.student.utwente.nl [130.89.165.91])
	by smtp.utwente.nl (8.12.10/SuSE Linux 0.7) with ESMTP id
	k5608Txt013860; Tue, 6 Jun 2006 02:08:29 +0200
From: Pieter de Goeje <pieter@degoeje.nl>
To: freebsd-hackers@freebsd.org
Date: Tue, 6 Jun 2006 02:08:28 +0200
User-Agent: KMail/1.9.1
References: <8e96a0b90606041148g5674ca31r74be2e1f9c79b640@mail.gmail.com>
In-Reply-To: <8e96a0b90606041148g5674ca31r74be2e1f9c79b640@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200606060208.28838.pieter@degoeje.nl>
X-UTwente-MailScanner-Information: Scanned by MailScanner. Contact
	helpdesk@ITBE.utwente.nl for more information.
X-UTwente-MailScanner: Found to be clean
X-UTwente-MailScanner-From: pieter@degoeje.nl
X-Spam-Status: No
Cc: mal content <artifact.one@googlemail.com>
Subject: Re: Strange behaviour from mkdir()?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Jun 2006 01:01:08 -0000

Hi MC,

On Sunday 04 June 2006 20:48, mal content wrote:
> Is this expected behaviour (I'm using the mkdir utility
> for the example, but the problem occurs using the system
> call directly):
>
> # mkdir .
> mkdir: .: File exists
> # mkdir ..
> mkdir: ..: File exists
>
> Now, the unusual one:
>
> # mkdir /
> mkdir: /: Is a directory
>
> Shouldn't it say 'file exists'?
In fact, the _only_ directory that I could find that shows this behaviour 
is /. (I am using 6-stable)

>
> The mkdir() man page doesn't say that the function can set
> errno to EISDIR and yet that's what's happening here.
>

I did some research on it, and it seems the mkdir utility is aware of the 
EISDIR error. Kinda weird if you ask me, since it isn't documented.

Pieter de Goeje