On Wed, 23 Jun 2004, Ronan Heffernan wrote:
> Dylan William Hardison wrote:
>
> >>done properly, konq shouldn't know the difference
> >>between ln -s and a real dir.
> >
> >Not quite true.
> >% ls baz/..
> >bar/
> >
> >baz/.. == foo/
> >
> >So, a symlink to a directory isn't quite the same as a directory.
> >
> >Shells and file managers have to jump through hoops to make .. appear to
> >point to the "right" place.
> >
> >
> >If you really want to link a dir, use this:
> > mount --bind olddir newdir
> >
> Actually, no. If I write a C program that calls:
> fopen("baz/myfile.txt","r"); then the symlink is followed automatically
> (the file foo/bar/myfile.txt is opened). I do not have to resolve the
> link target or anything like that. The hierarchy may not be identical,
> but as a container for files, the dereferencing is automatic.
Using something like this:
.- foo/
|
:- bar/
`- baz -> foo/
I believe the point was that if the app does nothing special, then a user
who "cd baz"es from bar/ then "cd .."s will not end up back in bar.
Hence, links aren't truly _transparent_ without extra work by the
programmers. Check this out:
[eben@pc eben]$ ln -s /usr usr
[eben@pc eben]$ cd usr
[eben@pc usr]$ pwd
/home/eben/usr
[eben@pc usr]$ /bin/pwd
/usr
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