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99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*
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* InspIRCd -- Internet Relay Chat Daemon
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*
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* Copyright (C) 2013, 2019-2022 Sadie Powell <sadie@witchery.services>
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* Copyright (C) 2012 Robby <robby@chatbelgie.be>
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* Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
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* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
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* Copyright (C) 2007 Oliver Lupton <om@inspircd.org>
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* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
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* Copyright (C) 2006 Craig Edwards <brain@inspircd.org>
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*
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* This file is part of InspIRCd. InspIRCd is free software: you can
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* redistribute it and/or modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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/** The extension that dynamic libraries end with. */
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#if defined __APPLE__
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# define DLL_EXTENSION ".dylib"
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#elif defined _WIN32
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# define DLL_EXTENSION ".dll"
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#else
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# define DLL_EXTENSION ".so"
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#endif
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/** The DLLManager class is able to load a module file by filename,
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* and locate its init_module symbol.
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*/
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class CoreExport DLLManager final
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: public Cullable
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{
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private:
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/** The last error string. */
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std::string err;
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/** The module library handle. */
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#ifdef _WIN32
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HMODULE lib = static_cast<HMODULE>(INVALID_HANDLE_VALUE);
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#else
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void* lib = nullptr;
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#endif
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/** The filename of the module library. */
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const std::string libname;
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/** Sets the last error string. */
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void RetrieveLastError();
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public:
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/** Attempts to load the specified module.
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* @param name The name of the library to load.
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*/
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DLLManager(const std::string& name);
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/** Unloads the module if one was loaded. */
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~DLLManager() override;
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/** Attempts to create a new module instance from this shared library.
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* @return Either a new instance of the Module class or NULL on error.
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*/
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Module* CallInit();
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/** Retrieves the value of the specified symbol.
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* @param name The name of the symbol to retrieve.
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* @return Either the value of the specified symbol or or NULL if it does not exist.
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*/
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void* GetSymbol(const char* name) const;
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/** Retrieves the value of the specified symbol and casts it to the requested type.
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* @param name The name of the symbol to retrieve.
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* @return Either the value of the specified symbol or or NULL if it does not exist.
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*/
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template <typename TReturn>
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TReturn* GetSymbol(const char* name) const
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{
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return static_cast<TReturn*>(GetSymbol(name));
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}
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/** Retrieves the module version from the dynamic library. */
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const char* GetVersion() const { return GetSymbol<const char>(MODULE_STR_VERSION); }
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/** Retrieves the last error which occurred or an empty string if no errors have occurred. */
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const std::string& LastError() const { return err; }
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/** Retrieves the filename of the underlying shared library. */
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const std::string& LibraryName() const { return libname; }
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};
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