However, my tests show that select()ing bpf fd does not lead to trigger packets
available to bpf filter; the process hangs in select state while parallel
tcpdump process shows packets desired *and* is in bpf state.
See PR kern/22063 "bpf when used with the select system call with timeout doesn't forward packets on timeout".
That *should* work in 4-STABLE, as that fix is in 4-STABLE. You should not have to turn BIOCIMMEDIATE on (tcpdump doesn't).
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