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This event is issued whenever a blocking semihosting read operation is unblocked.
It does not mean that no more input is required in the future. It is only a
hint that the target instance is not currently blocked because of missing input.
Non-blocking read operations never send this because they never block. The raw or
cooked mode should be set to cooked, see
Table 4-11 Event source IRIS_SEMIHOSTING_INPUT_UNBLOCKED
||File descriptor number used for input. This is usually 0, which means stdin.|