From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: find command seems to lock files
Date: Mon, 19 Aug 2019 14:26:00 -0000 [thread overview]
Message-ID: <20190819141321.GO11632@calimero.vinschen.de> (raw)
In-Reply-To: <609c28ca-07da-f150-139b-267448ede826@cs.umass.edu>
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On Aug 19 10:06, Eliot Moss wrote:
> On 8/19/2019 10:03 AM, Corinna Vinschen wrote:
> > On Aug 19 14:33, Morten Kjærulff wrote:
> > > Hi,
> > >
> > > I have an application which constantly:
> > > creates a file
> > > do some processing
> > > deletes the file
> > >
> > > One way to monitor if the application has crashed, is to check the age of
> > > the file, so I made a script that:
> > >
> > > find //$server/d$/dir/subdir*/subsubdir -name 'thefile' -printf '%A+\n'
> > >
> > > subdir* will be subdir1 subdir2 ...
> > > under subsubdir there will be dirA, dirB, ... and under those, thefile may
> > > exist.
> > >
> > > Problem is that it seems this command locks thefile, as the application
> > > sometimes can't delete it.
> > >
> > > Could this be true?
> >
> > Cygwin does not actually lock anything except in very rare
> > circumstances. Your problem is more likely triggered by a realtime
> > virus scanner.
>
> I was wondering, though, whether the parent directory would
> be non-delete-able while find has the directory open for scanning.
Usually yes. Cygwin moves the entire directory into the recycler in
case it's a local dir. That works even if a file is blocking the
dir from deletion.
> If the application in question creates and deletes the parent
> directory, as well as the leaf file, then things would be left
> around unexpectedly.
The question was just if the file is locked.
> So would use of find trigger a virus scanner, which in turn might
> hold on to the file and prevent its deletion?
That's how some realtime scanners work. They have hooks in the file API
and if some other process opens a file these scanners open the file as
well, typically without FILE_SHARE_DELETE, which Cygwin uses by default.
Corinna
--
Corinna Vinschen
Cygwin Maintainer
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next prev parent reply other threads:[~2019-08-19 14:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 12:49 Morten Kjærulff
2019-08-19 14:06 ` Corinna Vinschen
2019-08-19 14:13 ` Eliot Moss
2019-08-19 14:26 ` Corinna Vinschen [this message]
2019-08-19 14:41 ` Morten Kjærulff
2019-08-19 15:03 ` Eliot Moss
2019-08-19 17:05 ` Andrey Repin
2019-08-19 17:21 ` Andrey Repin
2019-08-19 17:41 ` Morten Kjærulff
2019-08-19 18:52 ` Eliot Moss
2019-08-19 19:43 ` Greywolf
2019-08-21 19:53 ` L A Walsh
2019-08-26 1:57 ` Chris Wagner
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