pub fn unix_signal_add<F>(signum: i32, func: F) -> SourceId where
F: FnMut() -> Continue + Send + 'static,
Adds a closure to be called by the default main loop whenever a UNIX signal is raised.
func will be called repeatedly every time
signum is raised until it
The default main loop almost always is the main loop of the main thread. Thus the closure is called on the main thread.