The short answer is: not much. Basically change a global variable declared as volatile sig_atomic_t. You can find more information in this presentation [1] (fr

The short answer is: not much. Basically change a global variable declared as volatile sig_atomic_t. You can find more information in this presentation [1] (from 2004!). [1]: http://www.openbsd.org/papers/opencon04/index.html http://www.openbsd.org/papers/opencon04/index.html