> I am trying to use ppdev to ensure that my printer and my scanner share
> correctly the parallel port. From the tests I done, it seems that ppdev lets you
> claim the port even if it is used by lp.
> For instance, the following program may be ran successfully when a printing
> is in progress, while I expected it to fail with 'tp: cannot claim port':
> <snip code>
If I remember correctly, multiple things can use the parallel port
concurrently, via the use of Tim's parport sharing stuff. To a certain
extent, this should happen transparently. If you want absolute control
of the parport, you have to issue the EXCL (exclusive) ioctl.
Hope that helps,
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