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https://github.com/libretro/scummvm.git
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124 lines
3.7 KiB
C++
124 lines
3.7 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2006 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#if defined(DYNAMIC_MODULES) && defined(UNIX)
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#include "backends/plugins/posix/posix-provider.h"
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#include "backends/plugins/dynamic-plugin.h"
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#include "common/fs.h"
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#include <dlfcn.h>
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#define PLUGIN_DIRECTORY "plugins/"
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class POSIXPlugin : public DynamicPlugin {
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protected:
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void *_dlHandle;
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Common::String _filename;
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virtual VoidFunc findSymbol(const char *symbol) {
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void *func = dlsym(_dlHandle, symbol);
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if (!func)
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warning("Failed loading symbol '%s' from plugin '%s' (%s)", symbol, _filename.c_str(), dlerror());
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// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
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// standard and POSIX: ISO C++ disallows casting between function pointers
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// and data pointers, but dlsym always returns a void pointer. For details,
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// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
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assert(sizeof(VoidFunc) == sizeof(func));
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VoidFunc tmp;
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memcpy(&tmp, &func, sizeof(VoidFunc));
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return tmp;
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}
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public:
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POSIXPlugin(const Common::String &filename)
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: _dlHandle(0), _filename(filename) {}
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bool loadPlugin() {
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assert(!_dlHandle);
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_dlHandle = dlopen(_filename.c_str(), RTLD_LAZY);
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if (!_dlHandle) {
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warning("Failed loading plugin '%s' (%s)", _filename.c_str(), dlerror());
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return false;
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}
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return DynamicPlugin::loadPlugin();
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}
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void unloadPlugin() {
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if (_dlHandle) {
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if (dlclose(_dlHandle) != 0)
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warning("Failed unloading plugin '%s' (%s)", _filename.c_str(), dlerror());
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}
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}
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};
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POSIXPluginProvider::POSIXPluginProvider() {
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}
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POSIXPluginProvider::~POSIXPluginProvider() {
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}
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PluginList POSIXPluginProvider::getPlugins() {
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PluginList pl;
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// Load dynamic plugins
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// TODO... this is right now just a nasty hack.
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// This should search one or multiple directories for all plugins it can
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// find (to this end, we maybe should use a special prefix/suffix; e.g.
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// instead of libscumm.so, use scumm.engine or scumm.plugin etc.).
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//
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// The list of directories to search could be e.g.:
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// User specified (via config file), ".", "./plugins", "$(prefix)/lib".
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//
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// We also need to add code which ensures what we are looking at is
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// a) a ScummVM engine and b) matches the version of the executable.
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// Hence one more symbol should be exported by plugins which returns
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// the "ABI" version the plugin was built for, and we can compare that
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// to the ABI version of the executable.
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// Load all plugins.
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// Scan for all plugins in this directory
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FilesystemNode dir(PLUGIN_DIRECTORY);
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FSList files;
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if (!dir.listDir(files, FilesystemNode::kListFilesOnly)) {
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error("Couldn't open plugin directory '%s'", PLUGIN_DIRECTORY);
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}
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for (FSList::const_iterator i = files.begin(); i != files.end(); ++i) {
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Common::String name(i->name());
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if (name.hasPrefix(PLUGIN_PREFIX) && name.hasSuffix(PLUGIN_SUFFIX)) {
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pl.push_back(new POSIXPlugin(i->path()));
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}
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}
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return pl;
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}
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#endif // defined(DYNAMIC_MODULES) && defined(UNIX)
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