libyui  3.0.10
/usr/src/RPM/BUILD/libyui-3.0.10/src/YUIPlugin.cc
00001 /*
00002   Copyright (C) 2000-2012 Novell, Inc
00003   This library is free software; you can redistribute it and/or modify
00004   it under the terms of the GNU Lesser General Public License as
00005   published by the Free Software Foundation; either version 2.1 of the
00006   License, or (at your option) version 3.0 of the License. This library
00007   is distributed in the hope that it will be useful, but WITHOUT ANY
00008   WARRANTY; without even the implied warranty of MERCHANTABILITY or 
00009   FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
00010   License for more details. You should have received a copy of the GNU
00011   Lesser General Public License along with this library; if not, write
00012   to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
00013   Floor, Boston, MA 02110-1301 USA
00014 */
00015 
00016 
00017 /*-/
00018 
00019   File:         YUIPlugin.h
00020 
00021   Author:       Stefan Hundhammer <sh@suse.de>
00022 
00023 /-*/
00024 
00025 
00026 #include <dlfcn.h>
00027 
00028 #define YUILogComponent "ui"
00029 #include "YUILog.h"
00030 
00031 #include "YUIPlugin.h"
00032 #include "YPath.h"
00033 
00034 #include "Libyui_config.h"
00035 
00036 
00037 YUIPlugin::YUIPlugin( const char * pluginLibBaseName )
00038 {
00039     _pluginLibBaseName = std::string( pluginLibBaseName );
00040 
00041     std::string pluginFilename = pluginLibFullPath();
00042 
00043     _pluginLibHandle = dlopen( pluginFilename.c_str(),
00044                                RTLD_NOW | RTLD_GLOBAL);
00045 
00046     if ( ! _pluginLibHandle )
00047     {
00048         _errorMsg = dlerror();
00049 
00050         yuiError() << "Could not load UI plugin \"" << pluginLibBaseName
00051                    << "\": " << _errorMsg
00052                    << std::endl;
00053     }
00054 }
00055 
00056 
00057 YUIPlugin::~YUIPlugin()
00058 {
00059     // This intentionally does NOT call unload(): This would be
00060     // counterproductive for almost all use cases of this class.
00061 }
00062 
00063 
00064 void
00065 YUIPlugin::unload()
00066 {
00067     if ( _pluginLibHandle )
00068         dlclose( _pluginLibHandle );
00069 }
00070 
00071 
00072 std::string
00073 YUIPlugin::pluginLibFullPath() const
00074 {
00075 
00076     std::string pluginName = PLUGIN_PREFIX;
00077     pluginName.append( _pluginLibBaseName );
00078     pluginName.append( PLUGIN_SUFFIX );
00079 
00080     YPath plugin( PLUGINDIR, pluginName );
00081 
00082     return plugin.path();
00083 }
00084 
00085 
00086 void * YUIPlugin::locateSymbol( const char * symbol )
00087 {
00088     if ( ! _pluginLibHandle )
00089         return 0;
00090 
00091     void * addr = dlsym( _pluginLibHandle, symbol );
00092 
00093     if ( ! addr )
00094     {
00095         yuiError() << "Could not locate symbol \"" << symbol
00096                    << "\" in " << pluginLibFullPath()
00097                    << std::endl;
00098     }
00099 
00100     return addr;
00101 }
00102 
00103 
00104 bool YUIPlugin::error() const
00105 {
00106     return _pluginLibHandle == 0;
00107 }
00108 
00109 
00110 bool YUIPlugin::success() const
00111 {
00112     return _pluginLibHandle != 0;
00113 }
00114 
00115 
00116 std::string YUIPlugin::errorMsg() const
00117 {
00118     return _errorMsg;
00119 }
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