user_group_bases.hpp

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00001 /*********************************************************************/
00002 // dar - disk archive - a backup/restoration program
00003 // Copyright (C) 2002-2052 Denis Corbin
00004 //
00005 // This program is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU General Public License
00007 // as published by the Free Software Foundation; either version 2
00008 // of the License, or (at your option) any later version.
00009 //
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018 //
00019 // to contact the author : dar.linux@free.fr
00020 /*********************************************************************/
00021 // $Id: user_group_bases.hpp,v 1.1.2.1 2007/07/24 16:29:32 edrusb Rel $
00022 //
00023 /*********************************************************************/
00024 
00028 
00029 #ifndef USER_GROUP_BASES_HPP
00030 #define USER_GROUP_BASES_HPP
00031 
00032 #include "../my_config.h"
00033 
00034 #ifdef __DYNAMIC__
00035 
00036 extern "C"
00037 {
00038 #if MUTEX_WORKS
00039 #if HAVE_PTHREAD_H
00040 #include <pthread.h>
00041 #endif
00042 #endif
00043 }
00044 
00045 #include <map>
00046 #include <string>
00047 #include "infinint.hpp"
00048 
00049 namespace libdar
00050 {
00051 
00052     class user_group_bases
00053     {
00054     public:
00055         user_group_bases() : filled(false) {};
00056 
00058 
00060         const std::string & get_username(const infinint & uid) const;
00061 
00062 
00064 
00066         const std::string & get_groupname(const infinint & gid) const;
00067 
00069 
00070         static void class_init();
00071 
00072     private:
00073         bool filled;
00074         std::map<infinint, std::string> user_database;
00075         std::map<infinint, std::string> group_database;
00076 
00077         void fill() const;
00078 
00079         static const std::string empty_string;
00080 #if MUTEX_WORKS
00081             // the system call used to read the password and group database are not re-entrant, the mutex
00082             // must block all other thread while a given thread is reading the databases
00083             // the best solution would have to let the user provide such a database object already filled
00084             // but that would rely on it not to destroy this object while threads are using it
00085             // for this reason, here the mutex is 'static'
00086         static pthread_mutex_t lock_fill;
00087 #endif
00088         static bool class_initialized;
00089 
00090     };
00091 
00092 }  // end of namespace
00093 
00094 #endif
00095 
00096 #endif

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