#include "zm_plugin.h" /*!\fn Plugin::Plugin(const std::string &sFilename) * \param sFilename is the name of plugin file to load */ Plugin::Plugin(const std::string &sFilename) : m_sPluginFileName(sFilename), m_hDLL(0), m_pDLLRefCount(0), m_pfnGetEngineVersion(0), m_pfnRegisterPlugin(0) { // Try to load the plugin as a dynamic library m_hDLL = dlopen(sFilename.c_str(), RTLD_LAZY|RTLD_GLOBAL); if(!m_hDLL) // if library hasn't been loaded successfully { throw runtime_error("Could not load '" + sFilename + "' (" + dlerror() + ")"); } // Locate the plugin's exported functions try { m_pfnGetEngineVersion = reinterpret_cast(dlsym(m_hDLL, "getEngineVersion")); m_pfnRegisterPlugin = reinterpret_cast(dlsym(m_hDLL, "registerPlugin")); // If the functions aren't found, we're going to assume this is // a plain simple DLL and not one of our plugins if(!m_pfnGetEngineVersion || ! m_pfnRegisterPlugin) throw runtime_error("'" + sFilename + "' is not a valid plugin"); // Initialize a new DLL reference counter m_pDLLRefCount = new size_t(1); } catch(runtime_error &ex) { dlclose(m_hDLL); throw ex; } catch(...) { dlclose(m_hDLL); throw runtime_error("Unknown exception while loading plugin '" + sFilename + "'"); } } /*!\fn Plugin::Plugin(const Plugin &Other) * \param Other is the other plugin instance to copy */ Plugin::Plugin(const Plugin &Other) : m_sPluginFileName(Other.m_sPluginFileName), m_hDLL(Other.m_hDLL), m_pDLLRefCount(Other.m_pDLLRefCount), m_pfnGetEngineVersion(Other.m_pfnGetEngineVersion), m_pfnRegisterPlugin(Other.m_pfnRegisterPlugin) { // Increase DLL reference counter ++*m_pDLLRefCount; } /*!\fn Plugin::operator=(const Plugin &Other) * \param Other is the other plugin instance to copy * return copy of object */ Plugin& Plugin::operator=(const Plugin &Other) { m_hDLL = Other.m_hDLL; m_pfnGetEngineVersion = Other.m_pfnGetEngineVersion; m_pfnRegisterPlugin = Other.m_pfnRegisterPlugin; m_pDLLRefCount = Other.m_pDLLRefCount; m_sPluginFileName = Other.m_sPluginFileName; // Increase DLL reference counter ++*m_pDLLRefCount; return *this; } Plugin::~Plugin() { // Only unload the DLL if there are no more references to it if(!--*m_pDLLRefCount) { delete m_pDLLRefCount; dlclose(m_hDLL); } } /*!\fn Plugin::registerPlugin(PluginManager &K) * \param K is the pointer to plugin manager */ void Plugin::registerPlugin(PluginManager &K) { m_pfnRegisterPlugin(K, m_sPluginFileName); }