gio/glocaldirectorymonitor.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   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 License, 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
  16  * Public 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: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include <config.h>
  24
  25 #include "glocaldirectorymonitor.h"
  26 #include "gunixmounts.h"
  27 #include "gdirectorymonitor.h"
  28 #include "giomodule-priv.h"
  29
  30 #include <string.h>
  31
  32 #include "gioalias.h"
  33
  34 enum
  35 {
  36   PROP_0,
  37   PROP_DIRNAME
  38 };
  39
  40 static gboolean g_local_directory_monitor_cancel (GDirectoryMonitor* monitor);
  41 static void mounts_changed (GUnixMountMonitor *mount_monitor, gpointer user_data);
  42
  43 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_DIRECTORY_MONITOR)
  44
  45 static void
  46 g_local_directory_monitor_finalize (GObject* object)
  47 {
  48   GLocalDirectoryMonitor* local_monitor;
  49   local_monitor = G_LOCAL_DIRECTORY_MONITOR (object);
  50
  51   g_free (local_monitor->dirname);
  52
  53   if (local_monitor->mount_monitor)
  54     {
  55       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
  56       g_object_unref (local_monitor->mount_monitor);
  57       local_monitor->mount_monitor = NULL;
  58     }
  59
  60   if (G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize)
  61     (*G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize) (object);
  62 }
  63
  64 static void
  65 g_local_directory_monitor_set_property (GObject      *object,
  66                                         guint         property_id,
  67                                         const GValue *value,
  68                                         GParamSpec   *pspec)
  69 {
  70   switch (property_id)
  71   {
  72     case PROP_DIRNAME:
  73       /* Do nothing */
  74       break;
  75     default:
  76       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  77       break;
  78   }
  79 }
  80
  81 static GObject *
  82 g_local_directory_monitor_constructor (GType                  type,
  83                                        guint                  n_construct_properties,
  84                                        GObjectConstructParam *construct_properties)
  85 {
  86   GObject *obj;
  87   GLocalDirectoryMonitorClass *klass;
  88   GObjectClass *parent_class;
  89   GLocalDirectoryMonitor *local_monitor;
  90   const gchar *dirname = NULL;
  91   gint i;
  92
  93   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
  94   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  95   obj = parent_class->constructor (type,
  96                                    n_construct_properties,
  97                                    construct_properties);
  98
  99   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
 100
 101   for (i = 0; i < n_construct_properties; i++)
 102     {
 103       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 104         {
 105           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 106           dirname = g_value_get_string (construct_properties[i].value);
 107           break;
 108         }
 109     }
 110
 111   local_monitor->dirname = g_strdup (dirname);
 112
 113   if (!klass->mount_notify)
 114     {
 115 #ifdef G_OS_WIN32
 116       g_warning ("G_OS_WIN32: no mount emulation");
 117 #else
 118       GUnixMountEntry *mount;
 119
 120       /* Emulate unmount detection */
 121
 122       mount = g_unix_mount_at (local_monitor->dirname, NULL);
 123
 124       local_monitor->was_mounted = mount != NULL;
 125
 126       if (mount)
 127         g_unix_mount_free (mount);
 128
 129       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 130       g_signal_connect (local_monitor->mount_monitor, "mounts_changed",
 131         G_CALLBACK (mounts_changed), local_monitor);
 132 #endif
 133     }
 134
 135   return obj;
 136 }
 137
 138 static void
 139 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 140 {
 141   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 142   GDirectoryMonitorClass *dir_monitor_class = G_DIRECTORY_MONITOR_CLASS (klass);
 143
 144   gobject_class->finalize = g_local_directory_monitor_finalize;
 145   gobject_class->set_property = g_local_directory_monitor_set_property;
 146   gobject_class->constructor = g_local_directory_monitor_constructor;
 147
 148   dir_monitor_class->cancel = g_local_directory_monitor_cancel;
 149
 150   g_object_class_install_property (gobject_class, PROP_DIRNAME,
 151     g_param_spec_string ("dirname", "Directory name", "Directory to monitor",
 152         NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
 153
 154   klass->mount_notify = FALSE;
 155 }
 156
 157 static void
 158 g_local_directory_monitor_init (GLocalDirectoryMonitor* local_monitor)
 159 {
 160 }
 161
 162 static void
 163 mounts_changed (GUnixMountMonitor *mount_monitor,
 164                 gpointer           user_data)
 165 {
 166   GLocalDirectoryMonitor *local_monitor = user_data;
 167   GUnixMountEntry *mount;
 168   gboolean is_mounted;
 169   GFile *file;
 170
 171   /* Emulate unmount detection */
 172 #ifdef G_OS_WIN32
 173   mount = NULL;
 174   g_warning ("G_OS_WIN32: no mount emulation");
 175 #else
 176   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 177
 178   is_mounted = mount != NULL;
 179
 180   if (mount)
 181     g_unix_mount_free (mount);
 182 #endif
 183
 184   if (local_monitor->was_mounted != is_mounted)
 185     {
 186       if (local_monitor->was_mounted && !is_mounted)
 187         {
 188           file = g_file_new_for_path (local_monitor->dirname);
 189           g_directory_monitor_emit_event (G_DIRECTORY_MONITOR (local_monitor),
 190                                           file, NULL,
 191                                           G_FILE_MONITOR_EVENT_UNMOUNTED);
 192           g_object_unref (file);
 193         }
 194       local_monitor->was_mounted = is_mounted;
 195     }
 196 }
 197
 198 static gint
 199 _compare_monitor_type_by_prio (gconstpointer _a,
 200                                gconstpointer _b,
 201                                gpointer      user_data)
 202 {
 203   const GType *a = _a, *b = _b;
 204   int prio_a, prio_b;
 205   gint ret;
 206   GQuark private_q;
 207
 208   private_q = g_quark_from_static_string ("gio-prio");
 209
 210   prio_a = GPOINTER_TO_INT (g_type_get_qdata (*a, private_q));
 211   prio_b = GPOINTER_TO_INT (g_type_get_qdata (*b, private_q));
 212
 213   ret = prio_b - prio_a;
 214
 215   return ret;
 216 }
 217
 218 static gpointer
 219 get_default_local_directory_monitor (gpointer data)
 220 {
 221   GType *monitor_impls;
 222   guint n_monitor_impls;
 223   gint i;
 224   GLocalDirectoryMonitorClass *chosen_class;
 225   GLocalDirectoryMonitorClass **ret = data;
 226
 227   _g_io_modules_ensure_loaded ();
 228
 229   monitor_impls = g_type_children (G_TYPE_LOCAL_DIRECTORY_MONITOR,
 230                                    &n_monitor_impls);
 231
 232   g_qsort_with_data (monitor_impls,
 233                      n_monitor_impls,
 234                      sizeof (GType),
 235                      _compare_monitor_type_by_prio,
 236                      NULL);
 237
 238   chosen_class = NULL;
 239   for (i = 0; i < n_monitor_impls; i++)
 240     {
 241       GLocalDirectoryMonitorClass *klass;
 242
 243       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (monitor_impls[i]));
 244
 245       if (klass->is_supported())
 246         {
 247           chosen_class = klass;
 248           break;
 249         }
 250       else
 251         g_type_class_unref (klass);
 252     }
 253
 254   g_free (monitor_impls);
 255
 256   if (chosen_class)
 257     {
 258       *ret = chosen_class;
 259       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 260     }
 261   else
 262     return (gpointer)G_TYPE_INVALID;
 263 }
 264
 265 /**
 266  * g_local_directory_monitor_new:
 267  * @dirname: filename of the directory to monitor.
 268  * @flags: #GFileMonitorFlags.
 269  *
 270  * Returns: new #GDirectoryMonitor for the given @dirname.
 271  **/
 272 GDirectoryMonitor*
 273 _g_local_directory_monitor_new (const char*       dirname,
 274                                 GFileMonitorFlags flags)
 275 {
 276   static GOnce once_init = G_ONCE_INIT;
 277   GTypeClass *type_class;
 278   GDirectoryMonitor *monitor;
 279   GType type;
 280
 281   type_class = NULL;
 282   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 283   type = (GType)once_init.retval;
 284
 285   monitor = NULL;
 286   if (type != G_TYPE_INVALID)
 287     monitor = G_DIRECTORY_MONITOR (g_object_new (type, "dirname", dirname, NULL));
 288
 289   /* This is non-null on first pass here. Unref the class now.
 290    * This is to avoid unloading the module and then loading it
 291    * again which would happen if we unrefed the class
 292    * before creating the monitor.
 293    */
 294
 295   if (type_class)
 296     g_type_class_unref (type_class);
 297
 298   return monitor;
 299 }
 300
 301 static gboolean
 302 g_local_directory_monitor_cancel (GDirectoryMonitor* monitor)
 303 {
 304   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 305
 306   if (local_monitor->mount_monitor)
 307     {
 308       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 309       g_object_unref (local_monitor->mount_monitor);
 310       local_monitor->mount_monitor = NULL;
 311     }
 312
 313   return TRUE;
 314 }
 315
 316 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 317 #include "gioaliasdef.c"