[tjalfi]

There were several implementations of that idea in the early 1980s. The following paper describes one of them.

More Taste: Less Greed? or Sending UNIX to the Fat Farm[0] describes a V7 derivative that had /dev/deuna, /dev/arp, /dev/ip, and /dev/udp.

[0] http://www.collyer.net/who/geoff/taste.pdf

[marvy]

Not much details though. Oh well.

[tjalfi]

The code in Research Unix V8, V9, and V10 is available. Alcaltel-Lucent made them public a couple months ago[0]. Here are the relevant URLs and file paths within the archives. I already had them on my hard drive and it was easy to grep them. I removed a few columns from the output of tar.

V8

http://www.tuhs.org/Archive/Distributions/Research/Dan_Cross...

  12738 Jul 25  1985 usr/sys/inet/tcp_device.c

V9

http://www.tuhs.org/Archive/Distributions/Research/Norman_v9...

  13461 Aug  6  1986 ./sys/inet.old/old/tcp_device.c
  13457 Feb  3  1987 ./sys/inet.old/tcp_device.c
  13457 Feb 24  1987 ./sys/inet/tcp_device.c

V10

http://www.tuhs.org/Archive/Distributions/Research/Dan_Cross...

  13542 Feb 20  1990 lsys/inet/tcp_device.c
  13622 Mar  9  1992 sys/inet/tcp_device.c

[0]https://news.ycombinator.com/item?id=13971909

Edited to fix formatting.

[marvy]

Oh, nice! But I can't find the right man page.

[tjalfi]

V8 doesn't have a /dev/tcp man page but the interface is documented at /usr/include/sys/inet/tcp_user.h[0].

Here are the commands I used to identify the right file.

find . -type f -print0 | xargs -0 grep -I "/dev/tcp" | less

[0] https://pastebin.com/8RT5vpH6

Edited to add the command sequence for the historical record.

Edited again to fix wording of the first sentence.

[marvy]

That's not very documented. How would someone use this?

[tjalfi]

V10 has a man page. Extract v10src.tar and look at man/adm/man4/tcp.4.