Re: Ada.Directories

[Martin Krischik <krischik@users.sourceforge.net>]

Larry Kilgallen wrote:

> In article <1589560.JmWJu6PyXJ@linux1.krischik.com>, Martin Krischik
> <krischik@users.sourceforge.net> writes:
>> Dmitry A. Kazakov wrote:
> 
>>> No, I still haven't got it. But because we don't have a workable
>>> definition of hard link, it just makes no sense to me to discuss it. And
>>> even if we had, it were totally irrelevant to the issue of
>>> Ada.Directories.
>> 
>> Sure we have. Each file is linked at least once and deleted if not.
>> 
>> I thought the discussion if about when a user is allowed to link / unlink
>> what kind of file.
>> 
>> And that is simple - you are not allowed to link or unlink directories.
>> rm is a high level command - try the low level "unlink" command and you
>> will see that it won't unlink any directory. And on the other hand ln
>> won't create links for directories. At least not on any unix I have come
>> across.
> 
> But the title of this topic is not restricted to Unix.
> 
> On VMS you can certainly apply SET FILE/ENTER and SET FILE/REMOVE to
> a directory.

Indeed - but then VMS does not have that silly "." and ".." in any
directory. Also GNU ln has:


  -d, -F, --directory          dem Super-User den Versuch erlauben, harte
                                 Verknï¿œpfungen fï¿œr Verzeichnisse anzulegen
                                 (Bem.: Schlï¿œgt vermutlich dennoch fehl
wegen
                                 Systembeschrï¿œnkungen, auch fï¿œr Super-User.)

Sorry, try again:

 -d, -F, --directory         allow the superuser to attempt to hard link
                                directories (note: will probably fail due to
                                system restrictions, even for the superuser)

but I have never found a unix where it worked.

Martin
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