Re: Deleting files with open handles on subst'd drives
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Original Message
From: Corinna Vinschen - corinna-cyg...@cygwin.com
Sent: Thursday, April 23, 2015 9:25 AM
To: cygwin@cygwin.com
Reply To: cygwin@cygwin.com
Subject: Re: Deleting files with open handles on subst'd drives
On Apr 23 10:15, Corinna Vinschen wrote:
> On Apr 23 01:44, David Macek wrote:
> > Hello everyone.
> >
> > Some time ago, I encountered a problem in a script when run on
> > Cygwin/MSYS2. To add some drama, I'll mention that the problem caused some
> > data loss (nothing important though). The problem is that some operations
> > on open files seem to fail on subst'd drives (but not on regular ones).
> >
> > To reproduce the problem, choose some writable directory and run:
> > $ subst X: C:/somesubdir
> > $ cd /cygdrive/x/
> > $ touch foo
> > $ { rm foo; touch foo; } > touch: cannot touch 'foo': Permission denied
> >
> > (Do not subst to just C:/, because that somehow doesn't lead to the error.)
> >
> > There's also a C program that does essentially the same thing:
> >
> >
> > I compared this with the same operations running on a regular drive,
> > but I couldn't find any difference in how `rm` deletes the file nor in
> > how `touch` creates the file. Just the result of the last NtCreateFile
> > is different (STATUS_SUCCESS vs. STATUS_DELETE_PENDING).
>
> It's a result of how Cygwin tries to workaround the weird Windows
> behaviour that a deleted, but still opened file is not invisible in the
> filesystem, as desired per POSIX. Cygwin then tries to move the
> file out of the way, on local drives into the recycler. This fails
> on a subst drive pointing to some subdir apparently, so Cygwin just
> falls back to what Windows does.
>
> I have no simple workaround for that. In theory there should be a
> way to check the drive for being a virtual drive and then using the
> recycler of the drive it's pointing to for the aforementioned operation.
I hacked a bit on that and it seems the solution was easier than I thought.
I uploaded new developer snaphshots to https://cygwin.com/snapshots/
Replacing the Cygwin DLL alone is sufficient for testing. Please give it
a try.
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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RE: [ANNOUNCEMENT] Updated: qt3-3.3.8b-17, qt4-4.8.6-7
unsubcribe -Original Message- From: Yaakov Selkowitz - yselkow...@cygwin.com [mailto:cygwin2.ares0.27aae075b3.yselkowitz#cygwin@ob.0sg.net] Sent: Thursday, April 23, 2015 10:15 AM To: cygwin@cygwin.com Subject: [ANNOUNCEMENT] Updated: qt3-3.3.8b-17, qt4-4.8.6-7 The following packages have been updated for the Cygwin distribution: * libqt3-3.3.8b-17 * libqt3-devel-3.3.8b-17 * qt3-devel-tools-3.3.8b-17 * qt3-doc-3.3.8b-17 * qt3-qtconfig-3.3.8b-17 * libQt3Support4-4.8.6-7 * libQt3Support4-devel-4.8.6-7 * libQtCore4-4.8.6-7 * libQtCore4-devel-4.8.6-7 * libQtDBus4-4.8.6-7 * libQtDBus4-devel-4.8.6-7 * libQtDeclarative4-4.8.6-7 * libQtDeclarative4-devel-4.8.6-7 * libQtDesigner4-4.8.6-7 * libQtDesigner4-devel-4.8.6-7 * libQtGui4-4.8.6-7 * libQtGui4-devel-4.8.6-7 * libQtHelp4-4.8.6-7 * libQtHelp4-devel-4.8.6-7 * libQtMultimedia4-4.8.6-7 * libQtMultimedia4-devel-4.8.6-7 * libQtNetwork4-4.8.6-7 * libQtNetwork4-devel-4.8.6-7 * libQtOpenGL4-4.8.6-7 * libQtOpenGL4-devel-4.8.6-7 * libQtScript4-4.8.6-7 * libQtScript4-devel-4.8.6-7 * libQtSql4-4.8.6-7 * libQtSql4-devel-4.8.6-7 * libQtSvg4-4.8.6-7 * libQtSvg4-devel-4.8.6-7 * libQtTest4-4.8.6-7 * libQtTest4-devel-4.8.6-7 * libQtXml4-4.8.6-7 * libQtXml4-devel-4.8.6-7 * libQtXmlPatterns4-4.8.6-7 * libQtXmlPatterns4-devel-4.8.6-7 * qt4-devel-tools-4.8.6-7 * qt4-designer-plugin-webkit-4.8.6-7 * qt4-doc-4.8.6-7 * qt4-qtconfig-4.8.6-7 Qt is a cross-platform application framework for desktop and embedded development. Qt enables programmers to create advanced GUI applications once and deploy them to Windows, Mac OS X and Linux without rewriting the source code. These release include patches for CVE-2015-1858, CVE-2015-1859, and CVE-2015-1860: http://lists.qt-project.org/pipermail/announce/2015-April/67.html -- Yaakov -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
RE: multitail segfaults
unsubscribe -Original Message- From: Yaakov Selkowitz - yselkow...@cygwin.com [mailto:cygwin2.ares0.27aae075b3.yselkowitz#cygwin@ob.0sg.net] Sent: Thursday, April 23, 2015 10:27 AM To: cygwin@cygwin.com Subject: Re: multitail segfaults On Thu, 2015-04-23 at 13:56 +0200, Frank Fesevur wrote: > 2015-04-23 11:04 GMT+02:00 Dr. Volker Zell: > > For me it works on 32bit cygwin, but on 64bit I get an error: > > > > xclip binary 'xclip' does not extist > > > > and in fact 32bit has /usr/bin/xclip installed but in 64bit it's > > missing > > Manually installing xclip solves the crash for me. So while you are on > it, could you please update the dependencies of the multitail package? Fixed on sourceware. Dr. Volker, please remember to add REQUIRES=xclip to your multitail.cygport so this doesn't get lost in the future. -- Yaakov -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
RE: Deleting files with open handles on subst'd drives
David, I want to be unsubscribed from the mailing list and thread. I will not click the link below because I do not know if it is a virus. Please remove immediately. -Original Message- From: David Macek - david.mace...@gmail.com [mailto:cygwin2.ares0.2af6b9dd8b.david.macek.0#gmail@ob.0sg.net] Sent: Thursday, April 23, 2015 10:32 AM To: cygwin@cygwin.com Subject: Re: Deleting files with open handles on subst'd drives On 23. 4. 2015 15:25, Nick Hansen wrote: > Unsubscribe Are you trying to unsubscribe from a thread, or from the whole mailing list? Please read: http://cygwin.com/ml/#unsubscribe-simple -- David Macek -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
