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Add link() info to TODO.detail.

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REL7_3_STABLE
Bruce Momjian 24 years ago
parent 53e95eee84
commit 0e484f19c9
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      doc/TODO.detail/win32

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doc/TODO.detail/win32
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Date: Thu, 12 Sep 2002 13:29:20 -0400
From: Mike Mascari <mascarm@mascari.com>
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To: Mike Mascari <mascarm@mascari.com>
cc: "scott.marlowe" <scott.marlowe@ihs.com>,
Justin Clift <justin@postgresql.org>, Dave Page <dpage@vale-housing.co.uk>,
Bruce Momjian <pgman@candle.pha.pa.us>,
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Subject: Re: [HACKERS] PGXLOG variable worthwhile?
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Status: OR
I wrote:
> scott.marlowe wrote:
>>
>> I wouldn't assume that. It's been years since I tested it, but back
>> then, the command line and all program I used could see the link
>> created by ln that came with the resource kit. They were distinctly
>> different from the shortcut type of links, in that they seems
>> transparent like short cuts in unix generally are.
>>
>> Do you have the resource kit or the gnu utils from it?
>
>
> The situation appears to be this:
>
> 1. Soft links are available on NTFS 5 (2K/XP) as Reparse Points via the
> DeviceIoControl() function for any application using the standard C
> library routines.
>
> 2. Soft links are available on any filesystem under 95/98/ME/NT4/2K/XP
> as OLE streams (.lnk files) for Shell-aware applications.
>
> 3. Hard links are available on NTFS 5 (2K/XP) via the CreateHardLink() API.
<snip>
> 4. Hard links are available on NTFS (NT3.1/NT4) via the BackupWrite()
> API by writing a special stream to the NTFS.
I also believe (I could be wrong) that for directories, the only
two methods of links are the Soft link methods above. So PGXLOG
cannot use soft links on a non-XP/2K machine unless it is
"Shell-Aware". For example, in a cygwin bash command window:
mkdir dir1
ln dir1 dir2 <- Error using Cygwin implementation
ln -s dir1 dir2 <- Creates a Shell short-cut (NT4)
echo "Hello" > dir1/test.txt
cat dir2/test.txt
"Hello" <- Cygwin's cat(bash?) is shell short-cut aware
Now, in a Windows NT command prompt:
notepad dir2\test.txt <- Notepad can't find file
notepad dir2.lnk <- Displays link contents
That means for a native port with a different PGXLOG directory
running on NT4, the only choice *using links* is to make the
native port shell short-cut aware.
I could be wrong but I don't think so.
Mike Mascari
mascarm@mascari.com
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To: "scott.marlowe" <scott.marlowe@ihs.com>
cc: Justin Clift <justin@postgresql.org>,
Dave Page
<dpage@vale-housing.co.uk>,
Bruce Momjian <pgman@candle.pha.pa.us>,
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Hackers Mailing List <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] PGXLOG variable worthwhile?
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Status: OR
scott.marlowe wrote:
> On Fri, 13 Sep 2002, Justin Clift wrote:
>
>>Would it be correct to say that the 'ln' command in the MS Resource Kit
>>creates this kind of shortcut too, as the Reparse Points feature doesn't
>>seem to be possible under NT4?
>
>
> I wouldn't assume that. It's been years since I tested it, but back then,
> the command line and all program I used could see the link created by ln
> that came with the resource kit. They were distinctly different from the
> shortcut type of links, in that they seems transparent like short cuts in
> unix generally are.
>
> Do you have the resource kit or the gnu utils from it?
The situation appears to be this:
1. Soft links are available on NTFS 5 (2K/XP) as Reparse Points
via the DeviceIoControl() function for any application using the
standard C library routines.
2. Soft links are available on any filesystem under
95/98/ME/NT4/2K/XP as OLE streams (.lnk files) for Shell-aware
applications.
3. Hard links are available on NTFS 5 (2K/XP) via the
CreateHardLink() API.
See:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/createhardlink.asp
4. Hard links are available on NTFS (NT3.1/NT4) via the
BackupWrite() API by writing a special stream to the NTFS.
Example:
http://www.mvps.org/win32/ntfs/lnw.cpp
The cygwin implementation of link():
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/syscalls.cc?rev=1.149.2.23&content-type=text/x-cvsweb-markup&cvsroot=src
1. Will use CreateHardLink() if on 2K/XP
2. Will try to use the BackupWrite() method
3. Failing #2 will just copy the file
See how fun Microsoft makes things?
Mike Mascari
mascarm@mascari.com

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