I asked myself what might be the reason that most of the error conditions returned by 'OutCommand' or 'Start/StopHWFilter' are ignored and not returned to the calling program (returning -1 from the ioctl handler and setting errno to a proper value).
As it is now, most of the ioctl's seem to be fire and forget, I do for example a STOP_DEMUX, get a return value of 0 but it did not work at all, continue with the program execution and things get worse.
Good work. You might want to have a look at the older drivers. Does 0.9.4 do this differently? Afaik there were no problems with OutCom errors or HWFilters pre-head. Maybe it wasn't implemented at all or the ioctl's were actually handled?
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