> Primarily your point 2, that is, CLONE_PID is supposed to be the flag
> that indicates when a set of tasks (at least) share a common signal
> delivery queue.
> It may imply other things, such as the effect of exit. Currently this
> is handled with some particularly ugly atexit hooks; it would be nice
> for things to be done cleaner.
Another thing it should do is to broadcast all uid/gid/euid etc. changes
to all other threads that share the pid. Currently Linux has "per thread
permissions", that differs from all other Unixes I know and it is a
potential security problem.
-Andi
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