[TUHS] Documents for UNIX Collections

Warner Losh imp at bsdimp.com
Sat Aug 13 02:37:32 AEST 2022

On Fri, Aug 12, 2022 at 10:06 AM Warner Losh <imp at bsdimp.com> wrote:

> On Fri, Aug 12, 2022 at 5:42 AM Jonathan Gray <jsg at jsg.id.au> wrote:
>> On Fri, Aug 12, 2022 at 05:15:52AM -0600, arnold at skeeve.com wrote:
>> > Paul Ruizendaal via TUHS <tuhs at tuhs.org> wrote:
>> >
>> > > I’m interested in the journey of SysV IPC. So far I have established
>> > > that these originated in CBUnix, with a lot of thinking on how to
>> optimize
>> > > these around the time that Unix 3.0/4.0/5.0 happened. They did not
>> appear
>> > > in Unix 3.0 / SysIII, and from the Unix 4.0 documentation I gather
>> that
>> > > it was not included there either.
>> >
>> > I am not sure you can make that conclusion, as the 4.0 printed documents
>> > did not include the programmer's manual; instead they gave out the
>> > 3.0 manual and there was a list of changes somewhere in the other doc.
>> >
>> > Unfortunately, without actual 4.0 sources, it will always be a question.
>> >
>> > I have this VERY vague memory that I saw IPC in 4.0, but I could
>> > very easily be wrong... It was over 40 years ago, after all. :-)
>> "Release 4.0 was launched from this organization in March. It introduced
>> new IPC mechanisms"
>> from pg 39 of Pirzada's thesis
>> https://spiral.imperial.ac.uk/bitstream/10044/1/7942/1/Shamim_Sharfuddin_Pirzada-1988-PhD-Thesis.pdf
> But also "Release 4.2 was launched in February 1982 for both the 3B & the
> machines. It contained improvements to the data communications and
> networking
> software and more mature IPC" though it goes on to say 4.2 was
> provisional. 5.0
> did have more things from CBUNIX: init and getty.
> I've also found this:
> https://groups.google.com/g/net.unix/c/-H9x36DMOBQ/m/P_G_s9SJBrgJ
> "Eventually, UNIX/TS was augmented to have
> many of the features present in CB-UNIX (this was done by Roger Faulkner
> at Indian Hill, BTL. This, in turn, became the base for UNIX 4.0, which
> was never released externally."
> This from a supervisor at Columbus...

Oh, see also the message from Guy Harris a few messages previous to the one
that opens up with the above link (minor edits by me):

doug_gwyn>The UNIX System V IPC was already present in USG UNIX 4.1.
doug_gwyn>(Not related to 4.1BSD.)

For you real UNIX trivia freaks, the USG 4.0 IPC was different
from the USG 4.1 IPC. The original message send/receive system calls sent
to a process ID; they were changed to send to message queues, which had a
32-bit unique ID, instead (which makes more sense, as it permits you to
transparently replace servers).

The note is extensive and goes into a lot of other areas related to IPC and
lists names
and references too.  In fact the whole thread is a good candidate to be
hoisted from
google groups while we have the chance and placed into the TUHS archive. Is
a process for that?


> referred to in tuhs/Documentation/Emails/dmr_wkt
>> "Other treasures:  Shamim Pirzada did most of a PhD thesis on Unix
>> as an exemplar of software evolution for Imperial College (London)
>> that (in the part I have) contains a pretty good account of details
>> of history up to about 1988."
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