The only UN*X systems I know of where select() can't be used are

    FreeBSD 4.3 and 4.4 (due to BPF deficiencies fixed in 4.5);

OS X 10.4[.x] (due to select() not working on *any* character special files);

Can you define the behaviour of 'not work' with BPF on tiger? I use select on a BPF fd and find that I'm still seeing packets on the BPF device. I set BIOCIMMEDIATE on the fd.
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