Re: Installing a C function into the IDT

On  8 May 2008 at 23:17, Jens Thoms Toerring wrote:
> I don't know about Windows but I am rather sure that Linux won't
> let you get at something that essential for the systems health
> from a userland program

Right - it's just not possible in user space. There's a good piece about
installing interrupt handlers in a Linux kernel module in Chapter 9 of
"Linux Device Drivers", which seems to be available online:
http://www.xml.com/ldd/chapter/book/ch09.html

Of course the OP's idea is completely crazy, for all the reasons people
have described, but it sounds like he's motivated by curiosity and
"learning by doing" rather than trying to use interrupt-based exception
handling in a serious program, and that's no bad thing. If he googles
around a bit, there are lots of people interested in userspace device
drivers, and particularly how to poll to see whether an interrupt has
occurred by having the kernel communicate that information to userspace
programs through the /proc filesystem.