Re: Bug in filelock.c

[Paul Eggert <eggert@cs.ucla.edu>]

On 02/23/2013 01:59 PM, Andreas Schwab wrote:
> It worked perfectly well until about 8 months ago.

Thanks, I installed the following patch to the emacs-24 branch
and I assume this fix will propagate into the trunk.

I still don't see the need for that extra business with
using '.#FOO.1' as the lock file name if a file '.#FOO' happens
to exist and is not a symbolic link.  How about if we remove
that stuff (in the trunk)?  Isn't it a waste of a system call for
something nobody should need?

----

Fix regression introduced by July 10 filelock.c patch.
* filelock.c (fill_in_lock_file_name): Fix crash caused by the
2012-07-10 patch to this file.  Reported by Eli Zaretskii in
<http://lists.gnu.org/archive/html/emacs-devel/2013-02/msg00533.html>
and diagnosed by Andreas Schwab in
<http://lists.gnu.org/archive/html/emacs-devel/2013-02/msg00534.html>.
=== modified file 'src/filelock.c'
--- src/filelock.c	2013-01-01 09:11:05 +0000
+++ src/filelock.c	2013-02-24 00:16:45 +0000
@@ -316,7 +316,7 @@
   p[1] = '.';
   p[2] = '#';

-  p = p + length + 2;
+  p = lockfile + length + 2;

   while (lstat (lockfile, &st) == 0 && !S_ISLNK (st.st_mode))
     {