Thank you both for your sage advice.
On 19 Mar 2008, at 21:03, Terry Lambert wrote:
/dev/console is a pseudo device which gets aliased to a pty when
someone calls TIOCCONS on the master side of it to take over the
console (this is how the "Console" program works).
The frame buffer driver is actualy accessed through the "km" tty
driver, and there isn't a device node published in /dev for that.
It'd be more correct to start a getty up on that devices (major #
12, minor number 0, subject to change in the future).
Typically, this won't do what you expect, though, because the getty
and login programs do not contain the complete logic for
establishing a controlling tty and doing session management.
Yes, this fits with what I found when I tried this!
Dave's little program in his other reply is enough to get one
program up, and semi-logged in on a sesion, assuming it's compiled
in the POSIX compilation environment so that the lack of the
O_NOCTTY lets the console become the controlling tty for your process.
Note that someone else can, if they choose, simply rip the console
out from under you with TIOCCONS, since you are talking to the alias
device (/dev/console) rather than the real device (/dev/km, which
does not have a device node assigned to it).
Thanks again: you've made me realise that the best way of going about
this is probably to boot to Terminal.app and go from there!
Cheers,
-geoff
______________________________________
Geoff Lee <email@hidden>
Computing Support
School of Arts, Culture and Environment
University of Edinburgh
20 Chambers St,
Edinburgh, Scotland,
EH1 1JZ
Tel: +44 (0)131 650 2341
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