Tim wrote:
On Fri, 2006-04-07 at 14:56 -0500, Mike McCarty wrote:
If my MSDOS machine were connected, and someone bombarded the serial
port, all that would happen is that the bits would fall on the floor,
and the overrun error bit would get set in the UART. With Linux,
interrupts would be generated, and the driver would accept the bytes,
buffer them, and eventually dump the input. (Unless something has
changed since the last time I looked at the Linux serial drivers.)
Are you saying that unexpected data coming through your COM port
wouldn't generate IRQ messages (COM ports have an IRQ), which would be
kicking the CPU quite hard? That's not exactly a trivial thing to
ignore.
The BIOS and MSDOS do not enable interrupts on the UART devices,
hence the CPU doesn't see any requests.
Please don't lecture me about MSDOS systems programming. I wrote my
first interrupt driven serial comm package for MSDOS in 1985.
Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!
