generalizing fd allocation code to id allocation

[David Schultz]

On Wed, Feb 11, 2009, Hans Petter Selasky wrote:
> On Wednesday 11 February 2009, Andriy Gapon wrote:
> > My nose has just been rubbed into alloc_unr(9) :)
> > Thanks, Roman!
> 
> The only problem about alloc_unr() is that you cannot allocate multiple 
> contiguous units?

Both Solaris' vmem(9) and NetBSD's extent(9) can do this...
might be worth looking into.