src/journal_factory.c

   1 /*======================================================================*
   2  * Copyright (C) 2008 Light Weight Event System                         *
   3  * All rights reserved.                                                 *
   4  *                                                                      *
   5  * This program is free software; you can redistribute it and/or modify *
   6  * it under the terms of the GNU General Public License as published by *
   7  * the Free Software Foundation; either version 2 of the License, or    *
   8  * (at your option) any later version.                                  *
   9  *                                                                      *
  10  * This program is distributed in the hope that it will be useful,      *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
  13  * GNU General Public License for more details.                         *
  14  *                                                                      *
  15  * You should have received a copy of the GNU General Public License    *
  16  * along with this program; if not, write to the Free Software          *
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                   *
  18  * Boston, MA 02110-1301 USA.                                           *
  19  *======================================================================*/
  20 #include "config.h"
  21
  22 #include "journal.h"
  23 #include "journal_gz.h"
  24 #include "journal_file.h"
  25
  26 #include "log.h"
  27 #include "opt.h"
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <dlfcn.h> /* see http://www.tldp.org/HOWTO/C++-dlopen/index.html */
  33
  34 int journal_factory(struct journal* jrn, const char* name)
  35 {
  36   if ( strcmp(arg_journ_type, ARG_FILE) == 0 )
  37     {
  38       if ( journal_file_ctor(jrn, name) < 0 )
  39         {
  40           LOG_ER("Failed to create a plain file journal.\n");
  41           return -1;
  42         }
  43     }
  44   else if ( strcmp(arg_journ_type, ARG_GZ) == 0 )
  45     {
  46       if ( journal_gz_ctor(jrn, name) < 0 )
  47         {
  48           LOG_ER("Failed to create a GZ compressed journal.\n");
  49           return -1;
  50         }
  51     }
  52   else
  53     {
  54       char pathname[256] ;
  55       char *err = NULL ;
  56       void* module = NULL ;
  57       /* TODO: Change /home/y/lib */
  58       strcpy(pathname, "/home/y/lib/liblwes-journaller-journal-") ;
  59       strcat(pathname, arg_journ_type) ;
  60       strcat(pathname, ".so") ;
  61       module = dlopen(pathname, RTLD_NOW) ;
  62
  63       if ( module )
  64         {
  65           char symname[100] ;
  66           strcpy(symname, "lwes_journaller_journal_") ;
  67           strcat(symname, arg_journ_type) ;
  68           strcat(symname, "_LTX_init") ;
  69           lwes_journaller_journal_init_t init =
  70             (lwes_journaller_journal_init_t) dlsym(module, symname) ;
  71           if ( !dlerror() )
  72             {
  73               if ( (*init)(jrn, name) < 0 )
  74                 {
  75                   LOG_ER("Failed to create a dynamic journal method.\n") ;
  76                   return -1 ;
  77                 }
  78               else
  79                 {
  80                   return 0 ;
  81                 }
  82             }
  83           else
  84             {
  85               err = dlerror() ;
  86             }
  87         }
  88       else
  89         {
  90           err = dlerror() ;
  91         }
  92
  93       LOG_ER("Unrecognized journal type \"%s\", try \"" ARG_FILE "\" or \"" ARG_GZ "\".\n%s\n",
  94              arg_journ_type, err);
  95       return -1;
  96     }
  97
  98   return 0;
  99 }