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Summary: The `fgets` function as implemented is not functional currently when called with multiple threads. This is because we rely on reapeatedly polling the character to detect EOF. This doesn't work when there are multiple threads that may with to poll the characters. this patch pulls out the logic into a standalone RPC call to handle this in a single operation such that calling it from multiple threads functions as expected. It also makes it less slow because we no longer make N RPC calls for N characters.