Re: [Xen-devel] debugging libxc / builders

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Tim Newsham wrote:

> Hi,
>    I'm playing with the builders in libxc.  I am having trouble
> debugging the thing.  I was wondering what options I have.
>
>   - When I run 'xm create', what process calls down to the
>     xc_builder stuff?  Can I attach to it with gdb?
Xend (the daemon) actually calls the xc_XXX_build function.  The C 
invocation occurs in the xc bindings.  I'm not aware of an easy way to 
attach to bindings with gdb (although I presume it's possible).
> Any hints or tips appreciated.
It would probably be significantly easier to debug builder issues with 
VM-Tools.  There's a single executable (vm-build.linux for instance) 
that only does building and can be stepped through with gdb.
Of course, you could also write your own really simple app with libxc 
that just did a few calls to create and build the domain.  You don't 
need any of the control channel stuff until the domain starts to 
actually boot.
I can give you a more detailed example if you need.

Regards,

Anthony Liguori

> Tim Newsham
> http://www.lava.net/~newsham/
>
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