leverage fixed fifo implementation (rev 1.56 of src/sys/fs/fifofs/fifo_vnops.c) to serve locks better, my previous workaround for lack of decent fifo system wasn't cutting it, particularly the kernel would send a message down the fifo and immediately close it, this would lead to delayed unlock requests being seen by the lockd causing all sorts of badness.
leverage fixed fifo implementation (rev 1.56 of
src/sys/fs/fifofs/fifo_vnops.c) to serve locks better, my previous
workaround for lack of decent fifo system wasn't cutting it,
particularly the kernel would send a message down the fifo and
immediately close it, this would lead to delayed unlock requests
being seen by the lockd causing all sorts of badness.

Basically, don't reopen the fifo, just select(2) on it.

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