[$] ioctl() for io_uring
Of all the system calls in the Unix tradition, few are as maligned as ioctl().
But ioctl() exists for a reason — for many reasons, in truth — and
cannot be expected to go away anytime soon. It is thus unsurprising that
there is interest in providing ioctl()-like functionality in the
io_uring subsystem. A recent RFC patch set
from Jens Axboe shows the form that this feature might take in the
io_uring context.