Message-ID: <399A8760.7F5943F3@softhome.net>
Date: Wed, 16 Aug 2000 14:21:52 +0200
From: Laurynas Biveinis <lauras AT softhome DOT net>
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To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
CC: djgpp-workers AT delorie DOT com
Subject: Re: Patch: open() adjustment for symlinks
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Reply-To: djgpp-workers AT delorie DOT com

Eli Zaretskii wrote:
> Sorry for being unclear.  Let me try to explain.

Thanks.

> If `__solve_symlinks' boils down to `_open' and `_read', which *can*
> be hooked by an FSEXT, then perhaps there's no problem.  

Yes.

> We need at
> least document the fact that FSEXT cannot hook the symlink resolution
> (thus, an FSEXT cannot easily simulate symlinks), but that the FSEXT
> will see the symlink-related calls via `_open' and `_read' handlers.

What about this draft?

Index: fsext.txh
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/fsext/fsext.txh,v
retrieving revision 1.7
diff -u -r1.7 fsext.txh
--- fsext.txh	2000/06/19 18:00:56	1.7
+++ fsext.txh	2000/08/16 12:24:43
@@ -10,6 +10,12 @@
 gain control when one of these low-level functions is called on a file
 descriptor set up by the extension.
 
+Note that @code{__solve_symlinks} does not contain FSEXT handler, so
+an extension cannot intercept symlink resolution directly.  However, 
+@code{__solve_symlinks} eventually calls @code{_open} and @code{_read},
+so if you provide open and read handlers, your extension should work OK
+with symlinks too.
+
 Each extension must provide one or two handler functions.  All handler
 functions take the same arguments: