ack.lrcvtime initialization in Linux 2.6.9

when no data was received during the connection,
tcpi_last_data_recv in struct tcp_info (getsockopt(...TCP_INFO...))
contains garbage value.  for example, one 30-second connection
had tcpi_last_data_recv=133682531.
then I thought maybe I could first check if tcpi_ato==0...
but no, sometimes it's 40000 (TCP_ATO_MIN) when no data was received.

so, I think it would be funnier if tcpi_last_data_recv was 0
(or 4294967295, or...) when no data was received.  right? :)

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