On Sat, 10 Mar 2007, Gene Heskett wrote:
> >I think there is alternative for you that can be done completely in
> >userland, without seeding mess into the kernel driver - do you think it
> >would be feasible that you create a trivial and small library, that
> I'm not up to writing a library. 15 years ago maybe, before the wet ram
> started to fade (I'm 72 now), I was pretty good with the 8 bit machines
> and wrote code & built boards in 1980 for an 1802 machine that was used
> till the later 90's, and repeated that in 1989 which we used till 2002,
> but linux is a whole new concept even if I have been running it since
> rh5.1 days. Are you aware of something that might serve as a starting
> framework to be hacked into doing this?
This is really failry trivial thing to do. Just cook up a fake wrapper
ioctl() library, something like this:
== ioctl.c ==
#define _GNU_SOURCE
#include <dlfcn.h>
long ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
long (*orig_ioctl)(unsigned int, unsigned int, unsigned long) =
dlsym(RTLD_NEXT, "ioctl");
if (cmd == /* put here the evil ioctl number the app is calling */)
return 0;
else
return orig_ioctl(fd, cmd, arg);
}
==
Then compile this like
gcc -shared -ldl ioctl.c -o ioctl.so
and then just execute your strange_application by
LD_PRELOAD=ioctl.so /path/to/broken/strange_application
Every ioctl() the application issues will then first pass through your
wrapper, where you can catch all the broken ioctl(), and let the correct
one pass through glibc to kernel on its usual way.
I am still however pretty far from being convinced that this will make
your application work. But as I absolutely don't know what your
application is expecting to obtain from serial port and how does this
compare to what it is getting from usb hiddev, it's just wild guesses.
--
Jiri Kosina
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