Stack Walk on linux using ptrace

Question

hello all,

Following is my requirement.

while process A is running.

1. attach Process A from B with PTRACE_ATTACH.
2. Start a Loop
3. Stop Process A
4. read registers
5. Resume Process A
6. sleep(1)
7. end loop
8. detach A

i am facing issue with Start and Resume Process A from the loop. i tried combination of kill(pid,SIGSTOP), kill(pid,SIGCONT), PTRACE_CONT. but didnt work.

any other solutions please?

Thanks in advance. Sandeep

Answer 1

Sounds like a very challenging project to undertake from scratch. Have you considered leveraging the GNU debugger in any way? In particular there is an long running sub-project called libgdb2 which may suit your purposes even though it is far from finished or stable at this time.

Answer 2

You could try scripting/interfacing with gdb in the same way that a lot of IDE's do. See also http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/gdb/gdb-mi.html