cmd_control

// -*- Mode: C++ -*-
// vim:ft=cpp
/*
 * Copyright (C) 2016 Kernkonzept GmbH.
 * Author(s): Sarah Hoffmann <sarah.hoffmann@kernkonzept.com>
 *
 * This file is distributed under the terms of the GNU General Public
 * License, version 2.  Please see the COPYING-GPL-2 file for details.
 */
#pragma once
 
#include <l4/sys/cxx/ipc_epiface>
#include <l4/sys/cxx/ipc_string>
 
namespace L4Re { namespace Ned {
 
/**
 * Direct control interface for Ned.
 */
class Cmd_control : public L4::Kobject_0t<Cmd_control>
{
  L4_INLINE_RPC_NF(long, execute, (L4::Ipc::String<> cmd,
                                   L4::Ipc::Array<char> &result));
 
public:
  /**
   * Execute the given Lua code.
   *
   * \param[in]  cmd     String with Lua code to execute.
   *
   * \retval L4_EOK      Code was successfully executed.
   * \retval -L4_EINVAL  Code could not be parsed.
   * \retval -L4_EIO     Error during code execution.
   *
   * The code is executed using the global Lua state of ned
   * which is retained between successive calls to execute.
   * Thus you may define data in one call to execute and use
   * it in a subsequent call.
   *
   * This function does not return any results from the execution
   * of the Lua code itself.
   */
  long execute(L4::Ipc::String<> cmd) noexcept
  {
    L4::Ipc::Array<char> res(0, NULL);
    return execute_t::call(c(), cmd, res);
  }
 
  /**
   * Execute the given Lua code.
   *
   * \param[in]  cmd     String with Lua code to execute.
   * \param[out] result  The first return value of the Lua code block
   *                     as string.
   *
   * \retval L4_EOK      Code was successfully executed.
   * \retval -L4_EINVAL  Code could not be parsed.
   * \retval -L4_EIO     Error during code execution.
   *
   * The code is executed using the global Lua state of ned
   * which is retained between successive calls to execute.
   * Thus you may define data in one call to execute and use
   * it in a subsequent call.
   */
  long execute(L4::Ipc::String<> cmd,
               L4::Ipc::String<char> *result) noexcept
  {
    L4::Ipc::Array<char> res(result->length, result->data);
    long r = execute_t::call(c(), cmd, res);
    if (r >= 0)
      result->length = res.length;
    return r;
  }
 
  typedef L4::Typeid::Rpcs<execute_t> Rpcs;
};
 
} } // namespace