Re: Is sendfile all that sexy?

[Jamie Lokier]

Felix von Leitner wrote:
> I cheated.  I was only talking about open().
> close() is of course more expensive then.
> 
> Other than that: where does the requirement come from?
> Can't we just use a free list where we prepend closed fds and always use
> the first one on open()?  That would even increase spatial locality and
> be good for the CPU caches.

You would need to use a new open() flag: O_ANYFD.
The requirement comes from this like this:

  close (0);
  close (1);
  close (2);
  open ("/dev/console", O_RDWR);
  dup ();
  dup ();

-- Jamie