Message-ID: <37CA34BD.49B37284@softhome.net>
Date: Mon, 30 Aug 1999 09:37:33 +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 <djgpp-workers AT delorie DOT com>
Subject: Re: symlink() & is_v2_prog() question
References: <Pine DOT SUN DOT 3 DOT 91 DOT 990830094050 DOT 3558A-100000 AT is>
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Reply-To: djgpp-workers AT delorie DOT com

Eli Zaretskii wrote:
[snip]

Thanks for clarifying this out.

> Of course, if `symlink' is going to support any type of file, then
> this should be reconsidered and maybe changed.  The decision depends,
> among other factors, on whether the symlink for a DJGPP executable
> will still be created like it is done today (i.e., by stubediting an
> empty stub), or perhaps it will use the general mechanism like the
> other files.

Yes, I've thought about it. I want to leave current .exe symlinks in
addition to new ones, because they work well from plain DOS. On the
other hand, they're not detected by stat(), readlink() as symlinks. I
think I'll enable current way in case when link source is valid v2
executable and use new way for everything else.

What I've written so far:
 - new fully working symlink() (issues above will be resolved soon)
 - new library function readlink() and its docs, taken from glibc-2.1.1.
   In fact, glibc-2.1.1 manual is my single source of info about symlinks.
 - new library function lstat() and its docs ("stat() not following 
   symlinks"), which is, in reality, renamed stat().
 - adapted stat() to follow symlinks (throwing EMLINK when neccesarry).
 - new macros in <sys/stat.h> S_ISLNK and S_IFLNK.
 - updated _PC_LINK_MAX and _POSIX_LINK_MAX. I haven't decided what value
   put there, because it is limited by stack size and nothing else.
 - new (taken from glibc) open() flag O_NOLINK, still unimplemented.

Now I am making lstat() to recognize symlinks and set mode bits, then
I'll update open(). That will be enough for symlinks to files.

Laurynas Biveinis