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Mail Archives: cygwin-developers/1998/04/14/09:01:57

From: rdparker AT butlermfg DOT org (Parker, Ron)
Subject: RE: FW: Special Filenames AUX, CON, etc.
14 Apr 1998 09:01:57 -0700 :
Message-ID: <c=US%a=_%p=Butler_Manufactu%l=BUILDINGS/BLDGSHUB/00097364.cygnus.cygwin32.developers@nttwr2.tower.bldgs.butlermfg.org>
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To: "cgf AT cygnus DOT com" <cgf AT cygnus DOT com>,
"cygwin32-developers AT cygnus DOT com"
<cygwin32-developers AT cygnus DOT com>

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Neither the "\\?\" syntax nor the "\\.\" syntax works in any version 
of Windows 95 or the Windows 98 Betas.  This is strictly an NT 
supported syntax.

What using "\\?\" really does is bypass the normal filename length 
restrictions and all lookups in the DosDevices tree of the NT 
ObjectManager.  This includes the standard DOS device names as well as 
any device driver that creates a "symbolic link" in the DOS namespace. 
 Don't confuse this with a UNIX symlink.  It is MS terminology.

See http://www.ntinternals.com/winobj.htm for a utility that will 
display the contents of ObjectManager.  The "??" key contains the 
DosDevice symbolic links.

-----Original Message-----
From: cgf AT cygnus DOT com [mailto:cgf AT cygnus DOT com]
Sent: Saturday, April 11, 1998 8:28 PM
To: cygwin32-developers AT cygnus DOT com
Subject: Re: FW: Special Filenames AUX, CON, etc.


In article 
<3 DOT 0 DOT 5 DOT 32 DOT 19980411153134 DOT 00a24770 DOT cygnus DOT cygwin32 DOT developers AT pop DOT ma DOT ult  
ranet.com>,
Larry Hall <lhall AT rfk DOT com> wrote:
>According to the MS docs, the "\\?\" syntax is an NT thing only. 
 Perhaps
>this is now dated information.  I don't know.  I've heard others 
claiming
>that just using UNC is enough to cure this problem.  If that's true, 
I
>think its better to use this capability, since it is more likely to 
work
>for 95 as well.

I wonder if opening the files in "posix mode" works around this, too.

If I have a chance, I'll check out the \\?\ syntax but I do seem to 
recall
that it doesn't work on Windows 95.
--
cgf AT cygnus DOT com             "Everything has a boolean value, if you 
stand
http://www.cygnus.com/      far enough away from it."  -- Galena 
Alyson Canada


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