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Diffstat (limited to 'mcop/extensionloader.cpp')
-rw-r--r-- | mcop/extensionloader.cpp | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/mcop/extensionloader.cpp b/mcop/extensionloader.cpp new file mode 100644 index 0000000..3ed8ea0 --- /dev/null +++ b/mcop/extensionloader.cpp @@ -0,0 +1,116 @@ + /* + + Copyright (C) 2000 Stefan Westerfeld + stefan@space.twc.de + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public License + along with this library; see the file COPYING.LIB. If not, write to + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. + + */ + +#include <config.h> +#include "extensionloader.h" +#include "startupmanager.h" +#include "mcoputils.h" +#include "debug.h" +#include <unistd.h> +#include <assert.h> + +using namespace std; +using namespace Arts; + +ExtensionLoader::ExtensionLoader(const string& filename) :handle(0) +{ + string dlfilename; + + assert(filename.size()); + if(filename[0] == '/') + dlfilename = filename; + else + { + const vector<string> *path = MCOPUtils::extensionPath(); + + vector<string>::const_iterator pi; + for(pi = path->begin(); pi != path->end(); pi++) + { + dlfilename = *pi + "/" + filename; + + if(access(dlfilename.c_str(),F_OK) == 0) + break; + } + } + + + /* this will catch all startup classes here */ + StartupManager::setExtensionLoader(this); + + lt_dlinit(); + handle = lt_dlopen(dlfilename.c_str()); + + StartupManager::setExtensionLoader(0); + + if(handle) + { + /* now process all startup classes of the loaded extension */ + list<StartupClass *>::iterator i; + + for(i = startupClasses.begin(); i != startupClasses.end(); i++) + (*i)->startup(); + needShutdown = true; + } + else + { + arts_warning("loading extension from '%s' failed: %s", + dlfilename.c_str(), lt_dlerror()); + } +} + +bool ExtensionLoader::success() +{ + return (handle != 0); +} + +void ExtensionLoader::shutdown() +{ + if(handle && needShutdown) + { + /* shutdown the loaded extension properly */ + list<StartupClass *>::iterator i; + + for(i = startupClasses.begin(); i != startupClasses.end(); i++) + (*i)->shutdown(); + needShutdown = false; + } +} + +ExtensionLoader::~ExtensionLoader() +{ + if(handle) + { + shutdown(); + lt_dlclose(handle); + + /* + * lt_dlexit & lt_dlinit have a counter, so there is no harm in + * calling one lt_dlinit in the constructor and one lt_dlexit here + */ + lt_dlexit(); + } +} + +void ExtensionLoader::addStartupClass(class StartupClass *sc) +{ + startupClasses.push_back(sc); +} |