K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2004-11-23T09:30:27.000000Z
K 7
svn:log
V 314
o Use ng_timeout() instead of timeout(9).

o Implement some netgraph flow control:
- Whenever status of HDLC heartbeat from pear is timed out,
  send NGM_LINK_IS_DOWN message.
- If HDLC link changes status from down to up, send
  NGM_LINK_IS_UP message.

Approved by:	julian (mentor), implicitly
MFC after:	1 week

END