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33bbbed9dd
This attribute tells gcc (and anything else that understands gcc attributes) that the functions will never return control, and helps the optimizer a little. With luck, it will also tell less-than-full-program dataflow analysis tools that they don't need to worry about any code path that involves calling one of these functions and then returning. This patch also forces event_exit() to always exit, no matter what the user-supplied fatal_callback does. This means that the old unit tests for the event_err* functions don't work any more, since they assume it is safe to call event_err* if you've given it a bogus fatal_callback that doesn't exit. Instead, we have to make the unit tests fork before calling event_err(), and have the main unit test process wait for the event_err() test to exit with a sane exit code. On unix, that's trivial. On windows, let's not bother and just assume that event_err* works.