<snip> > Parallel port sniffer would be hard, it would require OS support > because most of the time userland directly touches the parallel port > using iopl() and outb()/inb(). Actually, I'm using VMWare. It is possible to configure the vm to use a parport device file, so I think logging directly in the driver should work. > > Now I only see one chance to get the device work under linux: I want to > > write a driver that simply logs the traffic on the parallel port (the > > scanner works together with the computer via a virtual machine that uses > > the linux parport). > > You could give the virtual machine full access to the parallel port > hardware, but still ask it to log all access to that port. That's what > DOSemu allows and what was used to reverse engineer a couple of > parallel port protocols under DOS (IIRC ZIP disk parallel port driver, > among others). It seems as if VMWare doesn't support that. The driver for the scanner is a windows driver, so I think DOSemu won't be able to run the program. <snip> > > As I'm totally new to kernel development (I only read some books about it > > a year ago), I ask myself if it is possible to open a regular / device > > file in kernel mode. > > No, see the FAQ on the website. If it's lots of data, relayfs would be > a good choice. OK I'll have a look at the FAQ. Thanks so far, Andi
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