Messages in this thread |  | | Date | Thu, 24 Aug 2000 14:09:42 -0600 | From | yodaiken@fsmlabs ... | Subject | Re: SCO: "thread creation is about a thousand times faster than on native Linux" |
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On Thu, Aug 24, 2000 at 10:44:40PM +0200, almesber@lrc.di.epfl.ch wrote: > yodaiken@fsmlabs.com wrote: > > The root thread can tell Linux: I'm a pthreads root thread, I don't want > > POSIX signals, I want raw signals. > > Hmm, have you just created unkillable processes any non-privileged > user can run ? > > pthread_trust_me(RAW_SIGNALS_PLEASE); > for (;;); /* hee hee */
This is not a tough one:
pthread_raw_signals This call shifts delivered signal numbers up so that "special" POSIX signals can be delivered to a process. Sending signal N to a thread that has executed this call causes the kernel to deliver signal N+SIG_RAWSHIFT. So kill(pid,SIG_KILL-SIG_RAWSHIFT) is needed to hammer such a process.
Or: Make it a root pthread daemon.
Or: Make SIG_KILL still work as usual, with the CLONE_PTHREAD flag causing all children to be killed too, but with SUSPEND etc coming in raw.
-- --------------------------------------------------------- Victor Yodaiken Finite State Machine Labs: The RTLinux Company. www.fsmlabs.com www.rtlinux.com
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