Alex Hornung <ahornung@gmail.com> added the comment:
fwiw, for such a basic use of alloc_unr, devfs_clone_bitmap functions will work
fine (see man devfs_clone_bitmap_get). Just note that they always start the
numbering at 0, so you might need to set a few as allocated if you don't want
them. An upper limit is provided.
Cheers,
Alex Hornung
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