This might help.

//
//  FUNCTION: ReportStatusToSCMgr()
//
//  PURPOSE: Sets the current status of the service and
//           reports it to the Service Control Manager
//
//  PARAMETERS:
//    dwCurrentState - the state of the service
//    dwWin32ExitCode - error code to report
//    dwWaitHint - worst case estimate to next checkpoint
//
//  RETURN VALUE:
//    TRUE  - success
//    FALSE - failure
//
//  COMMENTS:
//
BOOL ReportStatusToSCMgr(DWORD dwCurrentState,
                        DWORD dwWin32ExitCode,
                        DWORD dwWaitHint)
{
  static DWORD dwCheckPoint = 1;
  BOOL fResult = TRUE;

  if ( !bDebug ) // when debugging we don't report to the SCM
  {
     if (dwCurrentState == SERVICE_START_PENDING)
        ssStatus.dwControlsAccepted = 0;
     else
        ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;

     ssStatus.dwCurrentState = dwCurrentState;
     ssStatus.dwWin32ExitCode = dwWin32ExitCode;
     ssStatus.dwWaitHint = dwWaitHint;

     if ( ( dwCurrentState == SERVICE_RUNNING ) ||
          ( dwCurrentState == SERVICE_STOPPED ) )
        ssStatus.dwCheckPoint = 0;
     else
        ssStatus.dwCheckPoint = dwCheckPoint++;

     // Report the status of the service to the service control manager.
     //
     if (!(fResult = SetServiceStatus( sshStatusHandle, &ssStatus)))
     {
        AddToMessageLog(L"SetServiceStatus");
     }
  }
  return fResult;
}

void WINAPI service_main(DWORD dwArgc, PWSTR *lpszArgv)
{

  // register our service control handler:
  //
  sshStatusHandle = RegisterServiceCtrlHandler( SZSERVICENAME,
service_ctrl);

  if (sshStatusHandle != NULL)
  {

 // SERVICE_STATUS members that don't change in example
 //
 ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
 ssStatus.dwServiceSpecificExitCode = 0;

 // report the status to the service control manager.
 //
 if (ReportStatusToSCMgr(
       SERVICE_START_PENDING, // service state
       NO_ERROR,              // exit code
       3000))                 // wait hint
  ServiceStart( dwArgc, lpszArgv );

 // try to report the stopped status to the service control manager.
 //

  ReportStatusToSCMgr(SERVICE_STOPPED, dwErr,0);
  }
  return;
}