AddHandler adds a handler to call when a SIGINT (Ctrl+C) is received.

Receiver listens for interrupt signals, registers interrupt callbacks, and responds to custom shutdown signals as required.

Request programatically requests a shutdown.

Requested returns true if an interrupt has been requested.

RequestRestart sets the reset flag and requests a restart.

AddHandlerChan is used to add an interrupt handler to the list of handlers to be invoked on SIGINT (Ctrl+C) signals.

Chan is used to receive SIGINT (Ctrl+C) signals.

HandlersDone is closed after all interrupt handlers run the first time an interrupt is signaled.

= true.

ShutdownRequestChan is a channel that can receive shutdown requests.

Signals is the list of signals that cause the interrupt.