[uml-devel] skas understanding

[Nicolas Blanc <nicolas.blanc@epfl.ch>]

Hello,
I am trying to figure out how does UML run in skas mod (I already red some
papers abouts it and now I d'like to jump into the code),
but I am experiencing some difficulties about things that are done in
function start_uml_skas :

1)  in function start_userspace :

    stack = mmap(...,MAP_ANONYMOUS,...);
    ...
    pid = clone(userspace_tramp, (void *) sp,
            CLONE_FILES | CLONE_VM | SIGCHLD, NULL);
    ...
    munmap(stack,PAGE_SIZE);

I don't understand the purpose of using anonymous mmap.

2) capture_signal_stack() : what is it for ?

3) Where is the kernel thread?

Thanks

Nicolas



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