package systemd import ( "errors" "net" "os" ) const ( // magic values for systemd // from https://www.freedesktop.org/software/systemd/man/sd_notify.html#Description Ready = "READY=1" Reloading = "RELOADING=1" Stopping = "STOPPING=1" ) var NotifyNoSocket = errors.New("No socket") // Notifier provides a method to send a message to systemd. type Notifier struct{} // Notify sends a message to the init daemon. It is common to ignore the error. func (n *Notifier) Notify(state string) error { addr := &net.UnixAddr{ Name: os.Getenv("NOTIFY_SOCKET"), Net: "unixgram", } if addr.Name == "" { return NotifyNoSocket } conn, err := net.DialUnix(addr.Net, nil, addr) if err != nil { return err } defer conn.Close() _, err = conn.Write([]byte(state)) return err }