engine/dconf-engine-source-service.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  * Copyright © 2012 Canonical Limited
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the licence, or (at your option) any later version.
   9  *
  10  * This library 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 GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Ryan Lortie <desrt@desrt.ca>
  21  */
  22
  23 #include "dconf-engine-source-private.h"
  24
  25 #include "dconf-engine.h"
  26 #include <sys/mman.h>
  27 #include <fcntl.h>
  28 #include <errno.h>
  29
  30 static void
  31 dconf_engine_source_service_init (DConfEngineSource *source)
  32 {
  33   source->bus_type = G_BUS_TYPE_SESSION;
  34   source->bus_name = g_strdup ("ca.desrt.dconf");
  35   source->object_path = g_strdup_printf ("/ca/desrt/dconf/%s", source->name);
  36   source->writable = TRUE;
  37
  38   dconf_engine_dbus_call_sync_func (source->bus_type, source->bus_name, source->object_path,
  39                                     "ca.desrt.dconf.Writer", "Init", NULL, NULL, NULL);
  40 }
  41
  42 static gboolean
  43 dconf_engine_source_service_needs_reopen (DConfEngineSource *source)
  44 {
  45   return !source->values || !gvdb_table_is_valid (source->values);
  46 }
  47
  48 static GvdbTable *
  49 dconf_engine_source_service_reopen (DConfEngineSource *source)
  50 {
  51   static gboolean did_warn;
  52   GError *error = NULL;
  53   GvdbTable *table;
  54   gchar *filename;
  55
  56   filename = g_build_filename (g_get_user_runtime_dir (), "dconf-service", source->name, NULL);
  57   table = gvdb_table_new (filename, FALSE, &error);
  58
  59   if (table == NULL)
  60     {
  61       if (!did_warn)
  62         {
  63           g_critical ("unable to open file '%s': %s; expect degraded performance", filename, error->message);
  64           did_warn = TRUE;
  65         }
  66
  67       g_error_free (error);
  68     }
  69
  70   g_free (filename);
  71
  72   return table;
  73 }
  74
  75 static void
  76 dconf_engine_source_service_finalize (DConfEngineSource *source)
  77 {
  78 }
  79
  80 G_GNUC_INTERNAL
  81 const DConfEngineSourceVTable dconf_engine_source_service_vtable = {
  82   .instance_size    = sizeof (DConfEngineSource),
  83   .init             = dconf_engine_source_service_init,
  84   .finalize         = dconf_engine_source_service_finalize,
  85   .needs_reopen     = dconf_engine_source_service_needs_reopen,
  86   .reopen           = dconf_engine_source_service_reopen
  87 };