Re: rm-ing files with open file descriptors

[Xavier Bestel <xavier.bestel@free.fr>]

On Sat, 2002-01-19 at 13:29, Alexander Viro wrote:
> 
> 
> On 19 Jan 2002, Xavier Bestel wrote:
> 
> > On Sat, 2002-01-19 at 13:16, Matthias Schniedermeyer wrote:
> > > > > Well no. new_fd will refer to a completely new, empty file
> > > > > which has no relation to the old file at all.
> > > > > 
> > > > > There is no way to recreate a file with a nlink count of 0,
> > > > > well that is until someone adds flink(fd, newpath) to the kernel.
> > > > > 
> > > > 
> > > > This *might* work:
> > > > 
> > > > link("/proc/self/fd/40", newpath);
> > > 
> > > cat /proc/<id>/fd/<nr> > whatever
> > > actually works.
> > 
> > Once it's unliked ? I doubt it.
> 
> Egads...  It certainly works, unlinked or not.  Please learn the basics of
> Unix filesystem semantics.

Indeed, it works, but it doesn't with a true symlink. What kind of a
link is that /proc/<id>/fd/<nr> entry ? It's not a symlink even if it
looks like one.