From: "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca>
Subject: Re: if file exist
Date: Thu, 26 Sep 2002 12:48:43 -0400
Date: 2002-09-26T12:48:43-04:00 [thread overview]
Message-ID: <3D933A6B.5000105@cogeco.ca> (raw)
In-Reply-To: 3d9245da.259420486@news.cis.dfn.de
Nick Roberts wrote:
> On 23 Sep 2002 06:38:22 -0600, Kilgallen@SpamCop.net (Larry Kilgallen)
> strongly typed:
>
>>On some operating systems the existence of a file for which the user
>>lacks read permission cannot be detected. A general solution for
>>detecting unreadable files is not possible.
On most file systems, when you don't have the permission(s)
to read the _directory_, you cannot determine if the file
exists or not (within that directory). This is because
the directory itself is unreadable by you, and intentially
so! So this is another example of how a general solution
is not possible, and this applies to _most_ O/S in use,
where security at the directory level is possible.
--
Warren W. Gay VE3WWG
http://home.cogeco.ca/~ve3wwg
next prev parent reply other threads:[~2002-09-26 16:48 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1032687678.1150.comp.lang.ada@ada.eu.org>
2002-09-22 9:58 ` if file exist Preben Randhol
2002-09-22 19:25 ` Keith Thompson
2002-09-22 11:26 ` Dale Stanbrough
2002-09-22 14:45 ` Simon Wright
2002-09-22 17:24 ` Frank J. Lhota
2002-09-22 19:24 ` Keith Thompson
2002-09-22 22:20 ` Dale Stanbrough
2002-09-23 5:14 ` Simon Wright
2002-09-23 12:38 ` Larry Kilgallen
2002-09-26 0:39 ` Nick Roberts
2002-09-26 16:48 ` Warren W. Gay VE3WWG [this message]
2002-09-26 22:14 ` Robert A Duff
2002-09-27 10:47 ` steve_H
2002-09-27 14:01 ` Robert A Duff
2002-09-27 18:43 ` Randy Brukardt
2002-09-28 1:17 ` Keith Thompson
2002-09-28 13:04 ` Marin David Condic
2002-09-29 4:50 ` Keith Thompson
2002-09-29 5:13 ` Christopher Browne
2002-09-27 21:59 ` Mark Biggar
2002-09-27 23:09 ` Larry Kilgallen
2002-10-04 20:56 ` Stefan Skoglund
2002-10-05 13:59 ` Robert A Duff
2002-10-06 20:35 ` Keith Thompson
2002-10-07 0:34 ` Robert A Duff
2002-10-07 5:42 ` David Thompson
2002-10-13 17:05 ` Larry Kilgallen
2002-10-21 2:17 ` David Thompson
2002-09-22 11:55 ` Per Sandbergs
2002-09-22 22:29 ` SteveD
2002-09-23 1:53 ` if_file_exist : it's working thankyou all! Dominic D'Apice
2002-09-23 5:25 ` Simon Wright
2002-09-23 23:59 ` Dominic D'Apice
2002-09-25 19:13 ` Simon Wright
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