RE: [PATCH 2.6.9] fork: add a hook in do_fork()

[Hua Zhong]

> +	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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