> > The burner software can open exclusive - see man open. > > You mean O_EXCL? That doesn't seem to make sense?
You must be referring to the fact that O_EXCL is essentially undefined without O_CREAT. It's absolutely true, but it doesn't mean that it's not passed down to kernel, most notably when you open a device. And as long as it's passed down, the device driver is free to interpret it. The latter means that there is no guaranteed/specified common meaning for O_EXCL flag and it might and does vary from implementation to implementation. E.g. Linux cdrom doesn't pay any attention to O_EXCL. Solaris sd driver respects it, but not the vol driver (the one I called "bypass" device in my previous post in this thread). A.
