Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Message-Id:	<4.3.1.2.20010731185222.02172eb8@pop.ma.ultranet.com>
X-Sender:	lhall AT pop DOT ma DOT ultranet DOT com
X-Mailer:	QUALCOMM Windows Eudora Version 4.3.1
Date:	Tue, 31 Jul 2001 18:59:01 -0400
To:	John Wiersba <John DOT Wiersba AT medstat DOT com>,
	"'cygwin'" <cygwin AT sourceware DOT cygnus DOT com>
From:	"Larry Hall (RFK Partners, Inc)" <lhall AT rfk DOT com>
Subject:	Re: unlink() problem
In-Reply-To:	<03F4742D8225D21191EF00805FE62B9908E23F92@aa-msg-01.medstat
	.com>
Mime-Version:	1.0

At 06:22 PM 7/31/2001, John Wiersba wrote:
>I'm having a problem with unlink().  I've scanned the FAQ and searched some
>in the newsgroup archives for information about the following problem.  I
>did find a post (see
>http://sources.redhat.com/ml/cygwin/2001-05/msg01095.html) but no apparent
>resolution.
>
>$ touch asdf
>$ perl -i -pe 1 asdf
>Can't do inplace edit on asdf: Permission denied.
>
>What perl is doing is equivalent to:
>
>$ perl -e '
>    open A, "< asdf" or die "one $!";  # open asdf for read
>    unlink "asdf";
>    open B, "> asdf" or die "two $!";  # open asdf for write
>    while (<A>) { print B }            # copy from A to B
>'
>two Permission denied at -e line 4.
>
>The problem:  after the unlink(), I can't open the same filename for write
>as I can on unix.  If I pause the program after unlinking asdf, it is still
>there and can be seen by ls, but can't be read by ls -l.  
>
>Is there a workaround for this behavior?  Is it considered a bug or is it
>just a quirk of the cygwin implementation of trying to implement unix
>filesystem semantics on top of windows?


The latter.  This has been quite a day for this issue!  This is the 
third time it came up.  Perhaps this qualifies as an FAQ now! ;-)

See my previous posts about this subject from earlier in the day:

http://www.cygwin.com/ml/cygwin/2001-07/msg01797.html
http://www.cygwin.com/ml/cygwin/2001-07/msg01774.html

There's also a related FAQ, although the message it mentions doesn't
seem to pop up anymore, which gives insight into the underlying 
implementation.  See:

http://www.cygwin.com/faq/faq_4.html#SEC57

Of course, the code is the "last word" on this subject in terms of the
actual implementation.







Larry Hall                              lhall AT rfk DOT com
RFK Partners, Inc.                      http://www.rfk.com
118 Washington Street                   (508) 893-9779 - RFK Office
Holliston, MA 01746                     (508) 893-9889 - FAX


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -