From: Kilgallen@SpamCop.net (Larry Kilgallen)
Subject: Re: if file exist
Date: 27 Sep 2002 17:09:41 -0600
Date: 2002-09-27T17:09:41-06:00 [thread overview]
Message-ID: <z1BDV70cmRSu@eisner.encompasserve.org> (raw)
In-Reply-To: 3D94D418.5010604@attbi.com
In article <3D94D418.5010604@attbi.com>, Mark Biggar <mark.a.biggar@attbi.com> writes:
> steve_H wrote:
>> But the above is not logical. If your function return FALSE, then one
>> does not know if this means the file actually does not exist, or that
>> the function was not able to determine if it exist or not becuase of
>> permission issues. The user might want to know this.
>
> No, from a computer security point of view, this is exactly what is
> wanted. A user should see absolutely no difference between "file does
> not exist" and "you don't have permission to see the file". Otherwise,
> you have introduced a covert information channel.
Beyond security, there are other possibilities like "this file is
shelved and all the unshelving drives are currently busy". And as
has been mentioned by others, "this file exists but someone else
will delete it between now and when you try to open it" :-)
next prev parent reply other threads:[~2002-09-27 23:09 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
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 [this message]
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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