=> R0 = 10
R2 = device driver stream handle
R3 = -1
<= R3 = 0 if not end of data
-1 if end of data
When DeviceFS is asked if EOF has been reached, it will respond false if a buffered stream still has buffered data, or an unbuffered stream has a non-empty RX/TX word. Otherwise it calls this entry point. Most devices will return -1 (EOF reached) but some (e.g. a scanner) may know that there is still data to come).
See PRM 2, page 604.
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