Also much too slow.
> You can emulate BSD socket interface (and ttys, and....) on the top of
> STREAMS (f.e. Solaris-2.*), but the reversed task is impossible.
> Only poor emulation, that is useless.
You can emulate the whole of the user view of streams in user space,
properly and accurately with only a few small kernel hooks for the
operations sockets don't represent. And note that almost all of those like
querying the next pending connection before accepting it are covered in the
Posix draft socket api