System V communication facilities query

[Doug Gwyn <gwyn>]

> Can anyone feed me some information on the interprocess communication 
> facilities that are available with System V - ie what is the equivalent of
> the BSD 4.2 socket on Sys V? I believe there exists an equivalent facility,
> called "streams", but that's about as much as I know.

Currently available releases of UNIX System V have the following:
	- FIFOs (named pipes)
	- semaphores
	- shared memory regions
	- message-passing
None of these are equivalent to sockets (and vice-versa).

Stream I/O is a nifty invention of Dennis Ritchie that is not yet
generally available.  It is expected to appear in future releases
of both UNIX System V and 4.nBSD.  Streams are not sockets either,
but they do provide the foundation for nice networking implementations.