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Message-ID: <22071.24647.434328.551494@compute03.cs.columbia.edu>
Date: Mon, 2 Nov 2015 08:08:23 -0500
From: Jonathan Lennox <lennox@cs.columbia.edu>
To: cygwin@cygwin.com
Subject: Re: fstat st_size on open files on Parallels filesystem is wrong
In-Reply-To: <20151102112334.GC5319@calimero.vinschen.de>
References: <227151856.20140421223417@yandex.ru>	<21333.26515.393838.380071@compute01.cs.columbia.edu>	<20140422081628.GC2339@calimero.vinschen.de>	<21334.55207.784319.488271@compute01.cs.columbia.edu>	<20140423084056.GJ2339@calimero.vinschen.de>	<21335.61113.963950.516021@compute01.cs.columbia.edu>	<20140423172413.GQ2339@calimero.vinschen.de>	<22038.38637.802707.846218@compute03.cs.columbia.edu>	<20151021110734.GO5319@calimero.vinschen.de>	<22071.12068.858109.210047@compute03.cs.columbia.edu>	<20151102112334.GC5319@calimero.vinschen.de>

On Monday, November 2 2015, "Corinna Vinschen" wrote to "cygwin@cygwin.com" saying:

> On Nov  2 04:38, Jonathan Lennox wrote:
> > Unfortunately, when I do "Run As Administrator" on MinTTY, the Mac drives
> > (/cygdrive/z and /cygdrive/y) don't show up. I don't know why that is.  So I
> > can't test hard links as administrator.
> 
> That's a security feature of UAC.  You can change that in the registry.
> As administrator:
> 
>   regtool -d set /HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System/EnableLinkedConnections 1
> 
> Then reboot.

Didn't work:

$ ls /cygdrive/
c  d  e

$ regtool get /HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System/EnableLinkedConnections

$ uname -a
CYGWIN_NT-10.0 Vidyo-LT0519-10 2.3.0(0.291/5/3) 2015-11-02 11:15 x86_64 Cygwin

Is Windows 10 the same?

> I added support for this filesystem (called prlfs in mount output) and
> without hardlink support for now.  I uploaded a new developer snapshot
> to https://cygwin.com/snapshots/ Please give it a try.

No, still seeing the failure in the snapshot:

$ ./stat-size-test.exe /cygdrive/y/foo ~/foo
/cygdrive/y/foo: fstat: st_size=0
/cygdrive/y/foo: stat: st_size=12
/home/jonathan/foo: fstat: st_size=12
/home/jonathan/foo: stat: st_size=12

$ uname -a
CYGWIN_NT-10.0 Vidyo-LT0519-10 2.3.0(0.291/5/3) 2015-11-02 11:15 x86_64 Cygwin

(See https://cygwin.com/ml/cygwin/2014-04/msg00488.html for the source code
to stat-size-test.c).

Oddly, though, the original problematic behavior I saw in emacs (with it
falsely detecting files as being modified externally) has gone away. Maybe
emacs added a workaround for this?

-- 
Jonathan Lennox
lennox@cs.columbia.edu

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