Hi,
I am trying to read task_struct fields from process virtual memory
using ptrace. But I am not able to do it. Can somebody tell me how can
I do it. My aim is take a process id, apply ptrace get the values of
vm_start and vm_end, and from these pages i want to read task_struct
fields of that process.

Thanks

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varma wrote:
> Hi,
> I am trying to read task_struct fields from process virtual memory
> using ptrace. But I am not able to do it. Can somebody tell me how can
> I do it.

You can't. task_struct is something that belongs to kernelspace, and you
can't read that from userspace.

> My aim is take a process id, apply ptrace get the values of
> vm_start and vm_end, and from these pages i want to read task_struct
> fields of that process.

That won't work.



Igmar

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Thanks. I want to trace all the processes as they started in Linux, so
that when the process exits, I will get control of the process being
traced, and using pid of that process i can get task_struct and, I can
read the process information(I/O, Mem, CPU time etc.). How can I do
this. Is it possible to do it.

I think i have to do it as kernel module, since get_task_by_pid can be
used from kernel module.

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