[TUHS] First appearance of named pipes
clemc at ccc.com
Sat Mar 7 07:10:34 AEST 2020
BTW: My memory is that Joy did not like them for some reason,
probably because they were not as sexy as some of the stuff Accent could do
(but that's a guess -- I've forgotten). So with 4.2, Joy created Unix
BTW: a slow cache refresh is occurring in my brain ... I remember one of
the things that there was a lot of arguing/moaning about at the time was
the directionality of such a feature. Bruce's hack from the mid-70s was
unidirectional and you needed two pipes to go both ways.
On Fri, Mar 6, 2020 at 4:06 PM Clem Cole <clemc at ccc.com> wrote:
> The first version was from Rand (called "Rand Pipes"). They
> certainly were available in the mid-70s on Sixth Edition, you have to ask
> someone like Bruce Borden if they were on Fifth. I think the code is on
> one of the 'USENIX' tapes in Warren's archives.
> At this point in time, someone would need to refresh my memory of the
> details of Rand's implementation compared to what came in the USG systems
> in the 1980s. For instance, I believe the early versions used mknod(2) to
> create the "named entity." IIRC early USG did that too, and mkfifo(3)
> came as part of the POSIX (I have memories of the discussion at a POSIX
> meeting, but as I say, I've forgotten the details).
> IIRC there were differences in buffering behavior, flushing, error path
> between USG's later versions and the original Rand, but I'd have to stare
> at the code again to remember.
> On Fri, Mar 6, 2020 at 3:42 PM Paul Ruizendaal <pnr at planet.nl> wrote:
>> The Luderer paper on distributed Unix has the following paragraph:
>> "A new special UNIX interprocess communication mechanism is the fifo,
>> which provides communication between unrelated processes by associating a
>> new special file type with a file name. Since remote fifos are legal, they
>> can be used for interprocessor communication between S-UNIX machines or
>> between an S-UNIX machine and an F-UNIX machine.”
>> The paper is from late 1981. Maybe I’m especially mud-eyed today, but I
>> cannot see FIFO’s implemented in V7..V8 or 4.1xBSD. When did FIFO’s become
>> a standard Unix feature?
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