cmd/dockerd/daemon_linux.go

package main

import systemdDaemon "github.com/coreos/go-systemd/v22/daemon"

// preNotifyReady sends a message to the host when the API is active, but before the daemon is
func preNotifyReady() {
}

// notifyReady sends a message to the host when the server is ready to be used
func notifyReady() {
	// Tell the init daemon we are accepting requests
	go systemdDaemon.SdNotify(false, systemdDaemon.SdNotifyReady)
}

// notifyStopping sends a message to the host when the server is shutting down
func notifyStopping() {
	go systemdDaemon.SdNotify(false, systemdDaemon.SdNotifyStopping)
}