[TUHS] A Unix Code Walkthrough by Ken Thompson

[TUHS] A Unix Code Walkthrough by Ken Thompson

[Warren Toomey via TUHS]

Hi all, I've just received a set of MP3 recordings from Bob Kridle. He says:

    These are recordings of Ken Thompson doing a read through of one of
    an early UNIX kernel code listing with a group of grad students at
    UC Berkeley while he was a visiting prof. there.

The date is roughly 1975. I've put the recordings here along with his
e-mails about the recordings:

https://www.tuhs.org/Archive/Recordings/1975_Unix_Code_Walkthru/

I've only just listened to the first few minutes of each. The quality
is fine, but I might spend some time reducing the noise, bringing up
the quiet parts and removing a few clicks and pops.

If anybody else has more details of these recording, please let us know!

Cheers, Warren

[TUHS] Re: A Unix Code Walkthrough by Ken Thompson

[Warren Toomey via TUHS]

On Sun, Dec 29, 2024 at 07:40:15AM +1000, Warren Toomey via TUHS wrote:
> Hi all, I've just received a set of MP3 recordings from Bob Kridle. He says:
> 
>     These are recordings of Ken Thompson doing a read through of one of
>     an early UNIX kernel code listing with a group of grad students at
>     UC Berkeley while he was a visiting prof. there.
> 
> The date is roughly 1975. I've put the recordings here along with his
> e-mails about the recordings:
> 
> https://www.tuhs.org/Archive/Recordings/1975_Unix_Code_Walkthru/

Eric Allman has kindly supplied a scan of the source code that ken
provided for the walkthrough. I've added it to the above location.
It's interesting in that there are comments at the start of each
function - the existing 5th Edition code that we have does not
have these comments.

Cheers & thanks Eric!
	Warren

[TUHS] Re: A Unix Code Walkthrough by Ken Thompson

[Jonathan Gray]

On Mon, Jan 13, 2025 at 03:11:21PM +1000, Warren Toomey via TUHS wrote:
> On Sun, Dec 29, 2024 at 07:40:15AM +1000, Warren Toomey via TUHS wrote:
> > Hi all, I've just received a set of MP3 recordings from Bob Kridle. He says:
> > 
> >     These are recordings of Ken Thompson doing a read through of one of
> >     an early UNIX kernel code listing with a group of grad students at
> >     UC Berkeley while he was a visiting prof. there.
> > 
> > The date is roughly 1975. I've put the recordings here along with his
> > e-mails about the recordings:
> > 
> > https://www.tuhs.org/Archive/Recordings/1975_Unix_Code_Walkthru/
> 
> Eric Allman has kindly supplied a scan of the source code that ken
> provided for the walkthrough. I've added it to the above location.
> It's interesting in that there are comments at the start of each
> function - the existing 5th Edition code that we have does not
> have these comments.

With alloc.c the comments are there in v6 and the copyright line
removal matches the changes between v5 and v6.

The code appears to be somewhere between v6 and the "50 changes" tape
described by Mike O'Brien in:
Applications/Spencer_Tapes/unsw3.tar.gz
usr/sys/v6unix/changenotes

Some of the pages are dated 1976, and sysent[] on p 87 has post v6
system calls: access(), alarm(), pause().

Thanks to all involved for making this available.