// -*- C++ -*-

//=============================================================================
/**
 *  @file    os_dlfcn.h
 *
 *  dynamic linking
 *
 *  $Id$
 *
 *  @author Don Hinton <dhinton@dresystems.com>
 *  @author This code was originally in various places including ace/OS.h.
 */
//=============================================================================

#ifndef ACE_OS_INCLUDE_OS_DLFCN_H
#define ACE_OS_INCLUDE_OS_DLFCN_H

#include "ace/pre.h"

#include "ace/config-all.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#if !defined (ACE_LACKS_DLFCN_H)
#  if defined (ACE_HAS_DLFCN_H_BROKEN_EXTERN_C)
     extern "C" {
#  endif /* ACE_HAS_DLFCN_H_BROKEN_EXTERN_C */
#  include /**/ <dlfcn.h>
#  if defined (ACE_HAS_DLFCN_H_BROKEN_EXTERN_C)
     }
#  endif /* ACE_HAS_DLFCN_H_BROKEN_EXTERN_C */
#endif /* !ACE_LACKS_DLFCN_H */

#if defined (ACE_PSOS)
   typedef ACE_HANDLE ACE_SHLIB_HANDLE;
#  define ACE_SHLIB_INVALID_HANDLE ACE_INVALID_HANDLE
#  define ACE_DEFAULT_SHLIB_MODE 0
#elif defined (ACE_WIN32)
   // Dynamic loading-related types - used for dlopen and family.
   typedef HINSTANCE ACE_SHLIB_HANDLE;
#  define ACE_SHLIB_INVALID_HANDLE 0
#  define ACE_DEFAULT_SHLIB_MODE 0
#endif /* ACE_PSOS */

/* Set the proper handle type for dynamically-loaded libraries. */
/* Also define a default 'mode' for loading a library - the names and values */
/* differ between OSes, so if you write code that uses the mode, be careful */
/* of the platform differences. */
#   if defined (ACE_HAS_SVR4_DYNAMIC_LINKING)
  typedef void *ACE_SHLIB_HANDLE;
#   define ACE_SHLIB_INVALID_HANDLE 0
#   if defined (__KCC) && defined(RTLD_GROUP) && defined(RTLD_NODELETE)
#   define ACE_DEFAULT_SHLIB_MODE RTLD_LAZY | RTLD_GROUP | RTLD_NODELETE
#   else
#   define ACE_DEFAULT_SHLIB_MODE RTLD_LAZY
#   endif /* KCC */
#   elif defined (__hpux)
#     if defined(__GNUC__) || __cplusplus >= 199707L
#       include /**/x <dl.h>
#     else
#       include /**/x <cxxdl.h>
#     endif /* (g++ || HP aC++) vs. HP C++ */
  typedef shl_t ACE_SHLIB_HANDLE;
#   define ACE_SHLIB_INVALID_HANDLE 0
#   define ACE_DEFAULT_SHLIB_MODE BIND_DEFERRED
#   else
  typedef void *ACE_SHLIB_HANDLE;
#   define ACE_SHLIB_INVALID_HANDLE 0
#   define ACE_DEFAULT_SHLIB_MODE RTLD_LAZY

#   endif /* ACE_HAS_SVR4_DYNAMIC_LINKING */

#if !defined (RTLD_LAZY)
#define RTLD_LAZY 1
#endif /* !RTLD_LAZY */

#if !defined (RTLD_NOW)
#define RTLD_NOW 2
#endif /* !RTLD_NOW */

#if !defined (RTLD_GLOBAL)
#define RTLD_GLOBAL 3
#endif /* !RTLD_GLOBAL */

#include "ace/post.h"
#endif /* ACE_OS_INCLUDE_OS_DLFCN_H */