install source tree (cd /usr , make src-create-shallow or make src-create)

then cd to repo dir and run make

you'll have flare.ko
load:
kldload ./flare.ko
unload:
kldunload flare
use:

echo anyth >/dev/echo
cp /dev/echo /dev/stdout

to check out poll:
first build app that makes it

c++ vegabond.cpp -o t

./t

bsd sample ported. make_dev dragonfly manpage has some info
https://github.com/thesjg/SJG-DragonFly-BSD-SoC/wiki/Locking-strategy

https://www.usenix.org/legacy/events/usenix01/freenix01/full_papers/lemon/lemon.pdf