27 Jul
2016
27 Jul
'16
11:01 p.m.
BTW: Mark if you are running on a simulator, just create an extra drive in
the RK05 driver, put 4280 blocks on it and mount it on /tmp in /etc/rc when
you go multi-user. You should be all set, and you will be running like
many/most V6 and V7 systems in years gone by.
On Wed, Jul 27, 2016 at 4:57 PM, Clem Cole <clemc(a)ccc.com> wrote:
That is exactly how its was done. In fact, DEC made
a Solid State Disk
(out of RAM) just for UNIX that people used to use for /tmp.
Also to be fair, Dennis did symlinks before 4.2. They were part of the
V8 I believe. I remember talking to him and Steve Bourne about them and
ideas in the FS. Dennis's basic thesis was that while UNIX had a typed
file system, he & Ken intentionally kept the number of types very very
small. The problem he was afraid of what that too many systems had ended
up so many different ways to handle things. Just keep everything as a
ASCII text file and let the user space deal with it. Symlinks, or "late
name binding" for the FS was a mixed bag. Just as Dennis predicted,
Solaris was an example of an implementation that went symlink happy.
I created Conditionally Dependant Symlinks (CDSL) which I think only
showed up in Masscomp's RTU, Stellix and Tru64. The were not only late
binding, but added the concept of a user settable context. Very handy
when trying to create a "single system image" from multiple system. I
miss them today from Linux clusters and even put them back into one of my
systems. B
Also, around the same time that Dennis added symlinks, Apollo's Aegis (aka
Domain) guys came up with a cool idea where you can run application code
from a link - extensible types. I remember talking to Dennis and Ken
about them at a SOSP IIRC, and toyed with putting them into one of the
Locus UNIX Kernels. We proposed it for HP-UX and Tru64, but never got
funded to try it, although I think / believe others did some where else.
On Wed, Jul 27, 2016 at 4:31 PM, William Pechter <pechter(a)gmail.com>
wrote:
Mark Longridge wrote:
Hi folks,
My root partition for Unix v6 is almost full and /dev/rk0 only has 83
blocks.
The trouble is I wanted to compile bc.y and I think it needs around
300 blocks of temporary space. I was wondering if there was a way to
set up Unix v6 so that it could use one of the other drives for tmp
space. I tried to set up a link using ln but it seems I can't link
across filesystems.
The exact error is "26: Intermediate file error".
I managed to rearrange things so that /dev/rk0 had over 300 blocks of
free space and it fixed the problem, but I'm curious if there was
another solution.
Mark
Ah the good old days before BSD's symlinks.
Only thing I can think of is add another drive or partition and mount it
as /tmp.
Bill