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> FreeBSD has a similar concept using /dev/fd "file-descriptor file system". (...) I'm not sure how it is supposed to work.
Sadly, on my FreeBSD VM, it seems like /dev/fd/ is not mounted with fdescfs by default, but as a regular directory with 3 hardcoded files 0, 1 and 2 which are character devices.
I had to mount fdescfs filesystem manually at /dev/fd/ :-(
$ cat /etc/fstab 
# Custom /etc/fstab for FreeBSD VM images
/dev/gpt/rootfs / ufs rw 1 1
/dev/gpt/swapfs none swap sw 0 0
Maybe it's an issue with "FreeBSD VM images" that I chose.
--
The FreeBSD CURRENT buildbot worker mounts /dev/fd:
CURRENT-amd64% cat /etc/fstab
# Device	Mountpoint	FStype	Options	Dump	Pass#
/dev/da0p2	none		swap	sw	0	0
/dev/da0p3	/		ufs	rw	1	1
fdescfs		/dev/fd		fdescfs	rw	0	0
CURRENT-amd64% mount|grep fd
fdescfs on /dev/fd (fdescfs)