Ioctls


Unix is isn't THAT sane once you look at the details
there are many subdispatcher-liker syscalls
ioctl is the worst

Native ioctl are per-device
but we don't have per-device hooks
fortunately ioctl usually don't overlap
biiiig switches

Major subsystems are implemented only/mostly this way
tty layer
STREAMS
SysV TCP/IP

Truckloads of code