=> R0 = 12 (MonitorTX) / 13 (MonitorRX)
R2 = device driver stream handle
<= VC, or
VS and R0 = pointer to error block
These entry points are called periodically by DeviceFS if a process has been blocking on your stream for some time, allowing devices to abort a blocking operation if there is an error with the device. The calls must be enabled by setting bit 2 of the flags word to DeviceFS_Register.
For example, the parallel device driver uses this to abort printer operations when the printer reports an error.
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