K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2007-07-20T09:41:54.000000Z
K 7
svn:log
V 485
ttyfree() frees the cdev().  But if there are pending kevents,
filt_ttyrdetach() etc would later attempt to dereference cdev->si_tty,
causing a 0xdeadc0de dereference.  Change kn_hook value from cdev to
struct tty to avoid dereferencing freed cdev.

In ttygone(), wake up select(), sigio and kevent() users in addition
to the queue sleepers.

Return EV_EOF from kevent filters if TS_GONE is set.

Submitted by:	peter
Tested by:	Peter Holm
Approved by:	re (kensmith)
MFC after:	2 weeks

END