Re: How to print structs in user space?

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Dheeraj Sangamkar wrote:
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.


It's been there since 4.0-3.19:

  http://people.redhat.com/anderson/crash.changelog.html#4_0_3_19

> Hopefully, my version of crash supports it.

If it doesn't, upgrade man, upgrade!!!

Dave



Dheeraj

On Fri, Mar 7, 2008 at 8:32 PM, Dave Anderson <anderson@xxxxxxxxxx <mailto:anderson@xxxxxxxxxx>> 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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