[Coco] Telnet to your CoCo.. and invite 6 of your friends
devries.bob at gmail.com
Tue Dec 1 18:21:01 EST 2009
Should the new F$SUser call return an illegal service request error if an
attempt is made by a user other than user 0?
I'm separated from my docs by some 1200 kilometers at this time, so I can't
look that up, at least not easily.
Regards, Bob Devries
Besides a mathematical inclination, an exceptionally good mastery of one's
native tongue is the most vital asset of a competent programmer.
Edsger W.Dijkstra, 18 June 1975
----- Original Message -----
From: "Aaron Wolfe" <aawolfe at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, December 02, 2009 10:06 AM
Subject: Re: [Coco] Telnet to your CoCo.. and invite 6 of your friends
I'd be happy to try writing a replacement F$SUser that fails if the
current userid > 0. It's probably just a couple bytes of changes.
Would this break things? I'm guessing the most compatible behavior
would be not to return any errors, since the original always succeeds.
On Tue, Dec 1, 2009 at 5:55 PM, Willard Goosey <goosey at virgo.sdc.org> wrote:
> On Tue, Dec 01, 2009 at 03:36:50PM -0600, Boisy G. Pitre wrote:
>> That's exactly what would happen... when the kernel scans for krnpX
>> modules, it will call the os9 F$SSvc system call to install the
>> system calls in that module; if any of those system calls reuse an
>> existing system call number, then their address will overrwrite the
>> address stored in the system call jump table in RAM.
> Well, that's the definitive answer from the definitive master. :-)
> That's really cool that a mechanism like that was already in place and
> running at a time when most operating systems, even for mainframes and
> minis, had completely statically linked kernels.
>> It's a great way to extend the operating system.
> Sounds really useful.
> Willard Goosey goosey at sdc.org
> Socorro, New Mexico, USA
> I search my heart and find Cimmeria, land of Darkness and the Night.
> -- R.E. Howard
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