How does ofdm sync work

Hi,
Does any one know how does ofdm in gnuradio do sync?
What I found in the gr_ofdm_frame_sink.cc is just check sig[0],
which
is just the second bytes of input_items. However, I didn’t see any
reason
that the (const char *) input_items[1] will be NULL.

Thanks,
Bin Zan

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