Beat Küng fdb92d4746 protocol_splitter: check available bytes before read()
This is to avoid blocking in any case.
If we don't do that, ioctl() may signal data available while the other
protocol does a read(), and when the first protocol tries to do a read(),
it would not have data anymore and would block (so this avoids a race
condition).
2021-08-22 10:42:13 -04:00
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