RTM_F_NOTIFY

[Tomáš Macek <maca02@xxxxxxxx>]

In the manual page is written that "RTM_F_NOTIFY  if the route changes, notify the  
user  via rtnetlink". Can you give me some information about how this 'notifying' 
works? How can I be notified? Will I be notified about one certain route change or only 
generaly about that route table changed?
I was looking for in the source of net-tools 1.60 and libnl and on google, but 
without success. Can you give me some link or info?

Any help appreciated!