[Crash-utility] How to print structs in user space?

[Dheeraj Sangamkar]

Thanks Dave,
ioctl related data structures are common.
I did not find the -u switch in the help for struct command in crash.
Hopefully, my version of crash supports it.

Dheeraj

On Fri, Mar 7, 2008 at 8:32 PM, Dave Anderson <anderson at redhat.com> wrote:

>
> Dheeraj Sangamkar wrote:
> > Hi,
> > When I debug ioctls, I get parameters which are pointers to structures
> > in user space.
> > I am unable to use the struct command to print these structures.
> >
> > Currently I am using "rd -u" to read the content of user memory and
> > decode it based on the structure information I have.
> >
> > Am I missing something? Is there an easier way to do this?
>
> As an addendum to the steps I described in my last post, it's possible
> that in your particular case that the ioctl-related data structures in
> user space are also "known" by the kernel, i.e. structures that are
> common to both user-space and kernel-space.  If that's true,
> then you don't need the "add-symbol-file" step -- just make
> sure that you are in the crash context of the process that
> owns the user-space instance, determine the user-space address
> of the structure, and simply use the "struct -u" option.
>
> Dave
>
>
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