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On 2/20/2020 11:23 AM, Larry McVoy wrote:
>
> Early Solaris was awful, just awful.  They pulled out sockets and replaced
> them with Lachman's STREAMS based TCP/IP stack (really convergent's stack,
> I believe Lachman bought it from them).  Performance was horrible, they
> brought in Mentat's stack and had to work on that, and eventually they
> brought back sockets.  I dunno if there is any STREAMS stuff left, that
> was a horrible idea.
>

It's still there. Not sure if it's used for more than a console keyboard 
driver anymore, but from a Solaris 11.3 machine:

more /usr/include/sys/stream.h
/*
  * Copyright (c) 1988, 2016, Oracle and/or its affiliates. All rights 
reserved.
  */

#ifndef _SYS_STREAM_H
#define _SYS_STREAM_H

/*
  * For source compatibility
  */
#include <sys/isa_defs.h>
#ifdef _KERNEL
#include <sys/vnode.h>
#endif
#include <sys/poll.h>
#include <sys/strmdep.h>
#include <sys/cred.h>
#include <sys/t_lock.h>
#include <sys/model.h>

#ifdef  __cplusplus
extern "C" {
#endif

...