28 Jun
2011
28 Jun
'11
4:18 p.m.
FWIW, the Unix habit of leaving the files as streams, instead of
diving into the then-current concept of files as either hierarchical
database or network database files. That left the FILE interface
simple, and allowed the applications to do all the necessary work.
Then there's Lion's comment about the nearest - at the time -
competitor for teaching, Brinch Hansen's Solo Concurrent Pascal OS
and permutations thereof, which he didn't think was anywhere near the
same standard. I've read the Loin's books and the Concurrent Pascal
book, and I can see his point. You can do things with Unix V6 that
you couldn't think of with Solo.
Just my 0.02c,from a Unix latecomer.
Wesley Parish
On 28/06/2011, at 4:13 PM, Greg 'groggy' Lehey wrote:
On Tuesday, 28 June 2011 at 10:11:40 +1000, Warren
Toomey wrote:
I'm having some trouble thinking of the right way to explain what is
an elegant design at the OS/syscall level, so any inspirations/ideas
would be most welcome. I might highlight a couple of syscall groups:
open/close/read/write, and fork/exec/exit/wait.
The system call interface is one thing, but I'm not sure it's the most
important one. Older operating systems (in my experience, IBM OS/360
and UNIVAC Omega and OS 1100) had similar interfaces. Omega also had
the concept of integer file descriptors (including 0, 1 and 2
preassigned). All of these systems had open/close/read/write, for
example.
I came to UNIX relatively late, and my first impression wasn't
favourable. It took me a while to realise what the real advantages
were. For me, they're:
- Text files. At the time, any data of any importance was stored in
custom-designed file formats. That was more efficient, both in
terms of processing time and space, but it made things difficult if
anything went wrong.
- The file system itself. I think the design of the file system,
especially the separation of names and the files themselves, but
also special files, is one of the most far-reaching designs I've
ever come across. To this day, I haven't found anything that even
comes close.
You might also get some ideas from
http://en.wikipedia.org/wiki/Unix_philosophy
Greg
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