text: // Copyright 2012 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // +build windows
  
  package main
  
  import (
  	"fmt"
  	"time"
  
  	"golang.org/x/sys/windows/svc"
  	"golang.org/x/sys/windows/svc/mgr"
  )
  
  func startService(name string) error {
  	m, err := mgr.Connect()
  	if err != nil {
  		return err
  	}
  	defer m.Disconnect()
  	s, err := m.OpenService(name)
  	if err != nil {
  		return fmt.Errorf("could not access service: %v", err)
  	}
  	defer s.Close()
  	err = s.Start("is", "manual-started")
  	if err != nil {
  		return fmt.Errorf("could not start service: %v", err)
  	}
  	return nil
  }
  
  func controlService(name string, c svc.Cmd, to svc.State) error {
  	m, err := mgr.Connect()
  	if err != nil {
  		return err
  	}
  	defer m.Disconnect()
  	s, err := m.OpenService(name)
  	if err != nil {
  		return fmt.Errorf("could not access service: %v", err)
  	}
  	defer s.Close()
  	status, err := s.Control(c)
  	if err != nil {
  		return fmt.Errorf("could not send control=%d: %v", c, err)
  	}
  	timeout := time.Now().Add(10 * time.Second)
  	for status.State != to {
  		if timeout.Before(time.Now()) {
  			return fmt.Errorf("timeout waiting for service to go to state=%d", to)
  		}
  		time.Sleep(300 * time.Millisecond)
  		status, err = s.Query()
  		if err != nil {
  			return fmt.Errorf("could not retrieve service status: %v", err)
  		}
  	}
  	return nil
  }
  