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    From
    SubjectRE: [PATCH 2.6.9] fork: add a hook in do_fork()
    Date
    > +	static int fork_hook_id = 0;
    > +
    > + /* We can set the hook if it's not already used */
    > + if ((func != NULL) && (fork_hook_id == 0)) {
    > + fork_hook = func;
    > + fork_hook_id = id;
    > + return 0;
    > + }

    What happens if two modules are calling the same function at the same time?

    > +
    > + if (fork_hook != NULL)
    > + fork_hook(current->pid, pid);
    > +
    > return pid;

    What happens if the module is unloaded between the test and the call to
    fork_hook?

    Hua

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