[lttng-dev] how to get the sockaddr struct from its pointer in kernel tracing

[Mathieu Desnoyers]

By close integration, I mean that we would have to change the in-kernel
structure declarations and wrap them into macros, so we can re-use those
headers within the TRACE_EVENT code to serialize the events and express
the event metadata.

Mathieu

* Rui Han (r.han at umiami.edu) wrote:
> Hi Mathieu,
> 
> Thank you very much for your reply. I'll look into that solution. By "close
> integration", do you mean minimum overhead? Could you be more
> specific about the issue that prevent it from being implemented in current
> version. So that I can tell whether I am be able to do it or not within
> time constrain.
> 
> Regards,
> Rui
> 
> On Tue, Jul 31, 2012 at 12:29 PM, Mathieu Desnoyers <
> mathieu.desnoyers at efficios.com> wrote:
> 
> > * Rui Han (r.han at umiami.edu) wrote:
> > > Hi,
> > >
> > > In the sys_connect and sys_bind kernel tracing, a pointer to the socdaddr
> > > struct has been dumped. (i.e. the second argument in sys_bind: { cpu_id
> > = 0
> > > }, { fd = 39, umyaddr = 0x7FE18E3D0B80, addrlen = 0xC }). What if I want
> > to
> > > access the struct for the IP and port number related to the socket? Is
> > > there an easy way to do this? Please give me some hints. Thank you very
> > > much.
> >
> > current, none.
> >
> > A "quick" way to do this might be to add a tracepoint into these system
> > calls.
> >
> > Eventually, we might look into supporting writing complex data
> > structures into lttng-modules, but this would require close integration
> > with the Linux kernel sources.
> >
> > Thanks,
> >
> > Mathieu
> >
> > >
> > > Regards,
> > > Rui
> >
> > > _______________________________________________
> > > lttng-dev mailing list
> > > lttng-dev at lists.lttng.org
> > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
> >
> > --
> > Mathieu Desnoyers
> > Operating System Efficiency R&D Consultant
> > EfficiOS Inc.
> > http://www.efficios.com
> >

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com