kubernetes/staging/src/k8s.io/apiserver/pkg/server/signal.go

var onlyOneSignalHandler …

var shutdownHandler …

// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
// which is closed on one of these signals. If a second signal is caught, the program
// is terminated with exit code 1.
// Only one of SetupSignalContext and SetupSignalHandler should be called, and only can
// be called once.
func SetupSignalHandler() <-chan struct{ … }

// SetupSignalContext is same as SetupSignalHandler, but a context.Context is returned.
// Only one of SetupSignalContext and SetupSignalHandler should be called, and only can
// be called once.
func SetupSignalContext() context.Context { … }

// RequestShutdown emulates a received event that is considered as shutdown signal (SIGTERM/SIGINT)
// This returns whether a handler was notified
func RequestShutdown() bool { … }