dynamic_library_traits_unix.hpp

Go to the documentation of this file.

/*
  CLAW - a C++ Library Absolutely Wonderful
 
  CLAW is a free library without any particular aim but being useful to
  anyone.
 
  Copyright (C) 2005-2011 Julien Jorge
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
  contact: julien.jorge@stuff-o-matic.com
*/
#ifndef __CLAW_DYNAMIC_LIBRARY_TRAITS_UNIX_HPP__
#define __CLAW_DYNAMIC_LIBRARY_TRAITS_UNIX_HPP__
 
#include <claw/exception.hpp>
#include <dlfcn.h>
#include <string>
 
namespace claw
{
  class dynamic_library_traits_unix
  {
  public:
    typedef void* handle;
 
  public:
    static handle open(const std::string& name)
    {
      handle h = dlopen(name.c_str(), RTLD_LAZY);
 
      if(!valid_handle(h))
        throw claw::exception(dlerror());
 
      return h;
    }

    static handle auto_open(const std::string& name)
    {
      handle h = dlopen(NULL, RTLD_LAZY);
 
      if(!valid_handle(h))
        throw claw::exception(dlerror());
 
      return h;
    }

    static void close(handle h)
    {
      dlclose(h);
    }

    template <class T>
    static T get_symbol(handle h, const std::string& name)
    {
      /* HACK : ISO standard doesn't allow to cast from a pointer to an object
         to a pointer to a function. */
      T result;
      *(void**)(&result) = dlsym(h, name.c_str());
 
      return result;
    }

    static bool have_symbol(handle h, const std::string& name)
    {
      return dlsym(h, name.c_str()) != NULL;
    }

    static bool valid_handle(handle h)
    {
      return h != NULL;
    }
 
  }; // class dynamic_library_traits_unix

  typedef dynamic_library_traits_unix dynamic_library_traits;
 
}
 
#endif // __CLAW_DYNAMIC_LIBRARY_TRAITS_UNIX_HPP__