[REVIEW/TEST] polling(4) changes

[Poul-Henning Kamp]

I still think we should stop having this network-centric view of
polling and implement _real_ *device* polling, so that other
device types can use it as well.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.