Type Alias SourceCallback 

pub type SourceCallback = Box<dyn FnMut() + Send>;

Called when a foreign source descriptor becomes readable.

The dispatcher never reads from the descriptor itself: the callback must drain it (eventfd_read, signalfd_siginfo, recvmsg, …) before returning, or the next dispatch fires the same callback again.

Aliased Type

pub struct SourceCallback(/* private fields */);