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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