svn commit: r256512 - head/usr.bin/netstat

Gleb Smirnoff glebius at FreeBSD.org
Wed Oct 30 08:10:44 UTC 2013


  Jeremie,

On Mon, Oct 28, 2013 at 09:41:13PM +0100, Jeremie Le Hen wrote:
J> On Tue, Oct 15, 2013 at 09:55:08AM +0000, Gleb Smirnoff wrote:
J> > Log:
J> >     Rewrite netstat/if.c to use getifaddrs(3) and getifmaddrs(3) instead of
J> >   libkvm digging in kernel memory. This is possible since r231506 made
J> >   getifaddrs(3) to supply if_data for each ifaddr.
J> >   
J> >     The pros of this change is that now netstat(1) doesn't know about kernel
J> >   struct ifnet and struct ifaddr. And these structs are about to change
J> >   significantly in head soon. New netstat binary will work well with 10.0
J> >   and any future kernel.
J> >   
J> >     The cons is that now it isn't possible to obtain interface statistics
J> >   from a vmcore.
J> 
J> Is there a kgdb macro or something like that that could be used for
J> debugging purpose?

No there is no such thing.

I've been debugging network related problems a lot, but I never had a need
to do 'netstat -i' on a vmcore. What we usually are interested at is
consistency of pointers and so on, not packets/bytes counters of an already
dead system.

Such a tool can be developed and put into src/tools, but I don't see enough
demand for it.

-- 
Totus tuus, Glebius.


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