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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// DLL.h
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#ifndef ACE_DLL_H
#define ACE_DLL_H
#include "ace/pre.h"
#include "ace/OS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class ACE_Export ACE_DLL
{
// = TITLE
// Provides an abstract interface for handling various DLL
// operations.
//
// = DESCRIPTION
// This class is an wrapper over the various methods for utilizing
// a dynamically linked library (DLL), which is called a shared
// library on some platforms. Operations <open>, <close>, and
// <symbol> have been implemented to help opening/closing and
// extracting symbol information from a DLL, respectively.
public:
// = Initialization and termination methods.
ACE_DLL (int close_on_destruction = 1);
// Default constructor. By default, the <close> operation on the
// object will be invoked before it is destroyed.
ACE_DLL (const ASYS_TCHAR *dll_name,
int open_mode = ACE_DEFAULT_SHLIB_MODE,
int close_on_destruction = 1);
// This constructor opens and dynamically links <dll_name>. The
// default mode is <RTLD_LAZY>, which loads identifier symbols but
// not the symbols for functions, which are loaded dynamically
// on-demand. Other supported modes include: <RTLD_NOW>, which
// performs all necessary relocations when <dll_name> is first
// loaded and <RTLD_GLOBAL>, which makes symbols available for
// relocation processing of any other DLLs.
int open (const ASYS_TCHAR *dll_name,
int open_mode = ACE_DEFAULT_SHLIB_MODE,
int close_on_destruction = 1);
// This method opens and dynamically links <dll_name>. The default
// mode is <RTLD_LAZY>, which loads identifier symbols but not the
// symbols for functions, which are loaded dynamically on-demand.
// Other supported modes include: <RTLD_NOW>, which performs all
// necessary relocations when <dll_name> is first loaded and
// <RTLD_GLOBAL>, which makes symbols available for relocation
// processing of any other DLLs. Returns -1 on failure and 0 on
// success.
int close (void);
// Call to close the DLL object.
~ACE_DLL (void);
// Called when the DLL object is destroyed -- invokes <close> if the
// <close_on_destruction> flag is set in the constructor or <open>
// method.
void *symbol (const char *symbol_name);
// If <symbol_name> is in the symbol table of the DLL a pointer to
// the <symbol_name> is returned. Otherwise, returns 0.
ASYS_TCHAR *error (void);
// Returns a pointer to a string explaining why <symbol> or <open>
// failed.
ACE_SHLIB_HANDLE get_handle (int become_owner = 0);
// Return the handle to the caller. If <become_owner> is non-0 then
// caller assumes ownership of the handle and the <ACE_DLL> object
// won't call <close> when it goes out of scope, even if
// <close_on_destruction> is set.
int set_handle (ACE_SHLIB_HANDLE handle, int close_on_destruction = 1);
// Set the handle for the DLL object. By default, the <close> operation on the
// object will be invoked before it is destroyed.
private:
ACE_SHLIB_HANDLE handle_;
// This is a handle to the DLL.
int close_on_destruction_;
// This flag keeps track of whether we should close the handle
// automatically when the destructor runs.
// = Disallow copying and assignment since we don't handle these.
ACE_UNIMPLEMENTED_FUNC (ACE_DLL (const ACE_DLL &))
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_DLL &))
};
#include "ace/post.h"
#endif /* ACE_DLL_H */
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