engine/dconf-engine-source-user.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 "../shm/dconf-shm.h"
  26 #include <sys/mman.h>
  27 #include <fcntl.h>
  28 #include <errno.h>
  29
  30 typedef struct
  31 {
  32   DConfEngineSource source;
  33
  34   guint8 *shm;
  35 } DConfEngineSourceUser;
  36
  37 static GvdbTable *
  38 dconf_engine_source_user_open_gvdb (const gchar *name)
  39 {
  40   GvdbTable *table;
  41   gchar *filename;
  42
  43   /* This can fail in the normal case of the user not having any
  44    * settings.  That's OK and it shouldn't be considered as an error.
  45    */
  46   filename = g_build_filename (g_get_user_config_dir (), "dconf", name, NULL);
  47   table = gvdb_table_new (filename, FALSE, NULL);
  48   g_free (filename);
  49
  50   return table;
  51 }
  52
  53 static void
  54 dconf_engine_source_user_init (DConfEngineSource *source)
  55 {
  56   source->bus_type = G_BUS_TYPE_SESSION;
  57   source->bus_name = g_strdup ("ca.desrt.dconf");
  58   source->object_path = g_strdup_printf ("/ca/desrt/dconf/Writer/%s", source->name);
  59   source->writable = TRUE;
  60 }
  61
  62 static gboolean
  63 dconf_engine_source_user_needs_reopen (DConfEngineSource *source)
  64 {
  65   DConfEngineSourceUser *user_source = (DConfEngineSourceUser *) source;
  66
  67   return dconf_shm_is_flagged (user_source->shm);
  68 }
  69
  70 static GvdbTable *
  71 dconf_engine_source_user_reopen (DConfEngineSource *source)
  72 {
  73   DConfEngineSourceUser *user_source = (DConfEngineSourceUser *) source;
  74
  75   dconf_shm_close (user_source->shm);
  76   user_source->shm = dconf_shm_open (source->name);
  77
  78   return dconf_engine_source_user_open_gvdb (source->name);
  79 }
  80
  81 static void
  82 dconf_engine_source_user_finalize (DConfEngineSource *source)
  83 {
  84   DConfEngineSourceUser *user_source = (DConfEngineSourceUser *) source;
  85
  86   dconf_shm_close (user_source->shm);
  87 }
  88
  89 G_GNUC_INTERNAL
  90 const DConfEngineSourceVTable dconf_engine_source_user_vtable = {
  91   .instance_size    = sizeof (DConfEngineSourceUser),
  92   .init             = dconf_engine_source_user_init,
  93   .finalize         = dconf_engine_source_user_finalize,
  94   .needs_reopen     = dconf_engine_source_user_needs_reopen,
  95   .reopen           = dconf_engine_source_user_reopen
  96 };