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Add link() info to TODO.detail.
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Bruce Momjian
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53e95eee84
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@ -6475,7 +6475,7 @@ X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
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From pgsql-hackers-owner+M28769@postgresql.org Thu Sep 12 13:30:45 2002
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Thu, 12 Sep 2002 13:30:07 -0400
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Message-ID: <3D80CEF0.1010900@mascari.com>
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Date: Thu, 12 Sep 2002 13:29:20 -0400
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From: Mike Mascari <mascarm@mascari.com>
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To: Mike Mascari <mascarm@mascari.com>
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cc: "scott.marlowe" <scott.marlowe@ihs.com>,
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Justin Clift <justin@postgresql.org>, Dave Page <dpage@vale-housing.co.uk>,
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Bruce Momjian <pgman@candle.pha.pa.us>,
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PostgreSQL Hackers Mailing List <pgsql-hackers@postgresql.org>
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Subject: Re: [HACKERS] PGXLOG variable worthwhile?
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Status: OR
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I wrote:
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> scott.marlowe wrote:
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>>
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>> I wouldn't assume that. It's been years since I tested it, but back
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>> then, the command line and all program I used could see the link
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>> created by ln that came with the resource kit. They were distinctly
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>> different from the shortcut type of links, in that they seems
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>> transparent like short cuts in unix generally are.
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>>
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>> Do you have the resource kit or the gnu utils from it?
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>
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>
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> The situation appears to be this:
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>
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> 1. Soft links are available on NTFS 5 (2K/XP) as Reparse Points via the
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> DeviceIoControl() function for any application using the standard C
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> library routines.
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>
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> 2. Soft links are available on any filesystem under 95/98/ME/NT4/2K/XP
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> as OLE streams (.lnk files) for Shell-aware applications.
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>
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> 3. Hard links are available on NTFS 5 (2K/XP) via the CreateHardLink() API.
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<snip>
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> 4. Hard links are available on NTFS (NT3.1/NT4) via the BackupWrite()
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> API by writing a special stream to the NTFS.
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I also believe (I could be wrong) that for directories, the only
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two methods of links are the Soft link methods above. So PGXLOG
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cannot use soft links on a non-XP/2K machine unless it is
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"Shell-Aware". For example, in a cygwin bash command window:
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mkdir dir1
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ln dir1 dir2 <- Error using Cygwin implementation
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ln -s dir1 dir2 <- Creates a Shell short-cut (NT4)
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echo "Hello" > dir1/test.txt
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cat dir2/test.txt
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"Hello" <- Cygwin's cat(bash?) is shell short-cut aware
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Now, in a Windows NT command prompt:
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notepad dir2\test.txt <- Notepad can't find file
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notepad dir2.lnk <- Displays link contents
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That means for a native port with a different PGXLOG directory
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running on NT4, the only choice *using links* is to make the
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native port shell short-cut aware.
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I could be wrong but I don't think so.
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Mike Mascari
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mascarm@mascari.com
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From mascarm@mascari.com Thu Sep 12 13:01:55 2002
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Return-path: <mascarm@mascari.com>
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Thu, 12 Sep 2002 13:01:42 -0400
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Message-ID: <3D80C847.1070000@mascari.com>
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Date: Thu, 12 Sep 2002 13:00:55 -0400
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From: Mike Mascari <mascarm@mascari.com>
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To: "scott.marlowe" <scott.marlowe@ihs.com>
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cc: Justin Clift <justin@postgresql.org>,
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Dave Page
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<dpage@vale-housing.co.uk>,
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Bruce Momjian <pgman@candle.pha.pa.us>,
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PostgreSQL
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Hackers Mailing List <pgsql-hackers@postgresql.org>
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Subject: Re: [HACKERS] PGXLOG variable worthwhile?
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References: <Pine.LNX.4.33.0209120945260.10924-100000@css120.ihs.com>
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Status: OR
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scott.marlowe wrote:
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> On Fri, 13 Sep 2002, Justin Clift wrote:
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>
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>>Would it be correct to say that the 'ln' command in the MS Resource Kit
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>>creates this kind of shortcut too, as the Reparse Points feature doesn't
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>>seem to be possible under NT4?
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>
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>
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> I wouldn't assume that. It's been years since I tested it, but back then,
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> the command line and all program I used could see the link created by ln
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> that came with the resource kit. They were distinctly different from the
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> shortcut type of links, in that they seems transparent like short cuts in
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> unix generally are.
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>
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> Do you have the resource kit or the gnu utils from it?
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The situation appears to be this:
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1. Soft links are available on NTFS 5 (2K/XP) as Reparse Points
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via the DeviceIoControl() function for any application using the
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standard C library routines.
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2. Soft links are available on any filesystem under
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95/98/ME/NT4/2K/XP as OLE streams (.lnk files) for Shell-aware
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applications.
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3. Hard links are available on NTFS 5 (2K/XP) via the
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CreateHardLink() API.
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See:
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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/createhardlink.asp
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4. Hard links are available on NTFS (NT3.1/NT4) via the
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BackupWrite() API by writing a special stream to the NTFS.
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Example:
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http://www.mvps.org/win32/ntfs/lnw.cpp
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The cygwin implementation of link():
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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
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1. Will use CreateHardLink() if on 2K/XP
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2. Will try to use the BackupWrite() method
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3. Failing #2 will just copy the file
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See how fun Microsoft makes things?
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Mike Mascari
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mascarm@mascari.com
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