As you said a HID device is more or less unidirectional. Therefore
you won't be able to detect from the device interface that something
is wrong. The HID interface itself would have to provide QoS.
Anyway QoS would not be part of XI but would be implemented in the
HW messaging extension.
Under Linux it is. Under BSD and Solaris (I think), you have read/write to USB devices.
But if you do a read() from the device and the syscall errors out, that's an issue the X Driver can report. If the X driver expects relative coordinates but for some reason is receiving absolute coordinates, that's reason to issue a report.
And yes, the kernel device driver can also issues quality of service reports. In the kernel's case, there's no-one that you can specifically send reports to. With my kernel device driver, I have a "diagnostic" file in the procfs that something could monitor for complaints...
-- ____ .:. ____ Bryan W. Headley - [EMAIL PROTECTED]
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