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 "giomodule-priv.h"
  28 #include "gfile.h"
  29 #include "gioerror.h"
  30 #include "glibintl.h"
  31
  32 #include <string.h>
  33
  34 #include "gioalias.h"
  35
  36 enum
  37 {
  38   PROP_0,
  39   PROP_DIRNAME
  40 };
  41
  42 static gboolean g_local_directory_monitor_cancel (GFileMonitor      *monitor);
  43 static void     mounts_changed                   (GUnixMountMonitor *mount_monitor,
  44                                                   gpointer           user_data);
  45
  46 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_FILE_MONITOR)
  47
  48 static void
  49 g_local_directory_monitor_finalize (GObject *object)
  50 {
  51   GLocalDirectoryMonitor *local_monitor;
  52   local_monitor = G_LOCAL_DIRECTORY_MONITOR (object);
  53
  54   g_free (local_monitor->dirname);
  55
  56   if (local_monitor->mount_monitor)
  57     {
  58       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
  59       g_object_unref (local_monitor->mount_monitor);
  60       local_monitor->mount_monitor = NULL;
  61     }
  62
  63   G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize (object);
  64 }
  65
  66 static void
  67 g_local_directory_monitor_set_property (GObject      *object,
  68                                         guint         property_id,
  69                                         const GValue *value,
  70                                         GParamSpec   *pspec)
  71 {
  72   switch (property_id)
  73   {
  74     case PROP_DIRNAME:
  75       /* Do nothing */
  76       break;
  77     default:
  78       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  79       break;
  80   }
  81 }
  82
  83 static GObject *
  84 g_local_directory_monitor_constructor (GType                  type,
  85                                        guint                  n_construct_properties,
  86                                        GObjectConstructParam *construct_properties)
  87 {
  88   GObject *obj;
  89   GLocalDirectoryMonitorClass *klass;
  90   GObjectClass *parent_class;
  91   GLocalDirectoryMonitor *local_monitor;
  92   const gchar *dirname = NULL;
  93   gint i;
  94
  95   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
  96   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  97   obj = parent_class->constructor (type,
  98                                    n_construct_properties,
  99                                    construct_properties);
 100
 101   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
 102
 103   for (i = 0; i < n_construct_properties; i++)
 104     {
 105       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 106         {
 107           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 108           dirname = g_value_get_string (construct_properties[i].value);
 109           break;
 110         }
 111     }
 112
 113   local_monitor->dirname = g_strdup (dirname);
 114
 115   if (!klass->mount_notify)
 116     {
 117 #ifdef G_OS_WIN32
 118       /*claim everything was mounted */
 119       local_monitor->was_mounted = TRUE;
 120 #else
 121       GUnixMountEntry *mount;
 122
 123       /* Emulate unmount detection */
 124
 125       mount = g_unix_mount_at (local_monitor->dirname, NULL);
 126
 127       local_monitor->was_mounted = mount != NULL;
 128
 129       if (mount)
 130         g_unix_mount_free (mount);
 131
 132       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 133       g_signal_connect_object (local_monitor->mount_monitor, "mounts_changed",
 134                                G_CALLBACK (mounts_changed), local_monitor, 0);
 135 #endif
 136     }
 137
 138   return obj;
 139 }
 140
 141 static void
 142 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 143 {
 144   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 145   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 146
 147   gobject_class->finalize = g_local_directory_monitor_finalize;
 148   gobject_class->set_property = g_local_directory_monitor_set_property;
 149   gobject_class->constructor = g_local_directory_monitor_constructor;
 150
 151   file_monitor_class->cancel = g_local_directory_monitor_cancel;
 152
 153   g_object_class_install_property (gobject_class,
 154                                    PROP_DIRNAME,
 155                                    g_param_spec_string ("dirname",
 156                                                         P_("Directory name"),
 157                                                         P_("Directory to monitor"),
 158                                                         NULL,
 159                                                         G_PARAM_CONSTRUCT_ONLY|
 160                                                         G_PARAM_WRITABLE|
 161                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 162
 163   klass->mount_notify = FALSE;
 164 }
 165
 166 static void
 167 g_local_directory_monitor_init (GLocalDirectoryMonitor *local_monitor)
 168 {
 169 }
 170
 171 static void
 172 mounts_changed (GUnixMountMonitor *mount_monitor,
 173                 gpointer           user_data)
 174 {
 175   GLocalDirectoryMonitor *local_monitor = user_data;
 176   GUnixMountEntry *mount;
 177   gboolean is_mounted;
 178   GFile *file;
 179
 180   /* Emulate unmount detection */
 181 #ifdef G_OS_WIN32
 182   mount = NULL;
 183   /*claim everything was mounted */
 184   is_mounted = TRUE;
 185 #else
 186   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 187
 188   is_mounted = mount != NULL;
 189
 190   if (mount)
 191     g_unix_mount_free (mount);
 192 #endif
 193
 194   if (local_monitor->was_mounted != is_mounted)
 195     {
 196       if (local_monitor->was_mounted && !is_mounted)
 197         {
 198           file = g_file_new_for_path (local_monitor->dirname);
 199           g_file_monitor_emit_event (G_FILE_MONITOR (local_monitor),
 200                                      file, NULL,
 201                                      G_FILE_MONITOR_EVENT_UNMOUNTED);
 202           g_object_unref (file);
 203         }
 204       local_monitor->was_mounted = is_mounted;
 205     }
 206 }
 207
 208 static gpointer
 209 get_default_local_directory_monitor (gpointer data)
 210 {
 211   GLocalDirectoryMonitorClass *chosen_class;
 212   GLocalDirectoryMonitorClass **ret = data;
 213   GIOExtensionPoint *ep;
 214   GList *extensions, *l;
 215
 216   _g_io_modules_ensure_loaded ();
 217
 218   ep = g_io_extension_point_lookup (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
 219
 220   extensions = g_io_extension_point_get_extensions (ep);
 221
 222   chosen_class = NULL;
 223   for (l = extensions; l != NULL; l = l->next)
 224     {
 225       GIOExtension *extension = l->data;
 226       GLocalDirectoryMonitorClass *klass;
 227
 228       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_io_extension_ref_class (extension));
 229
 230       if (klass->is_supported ())
 231         {
 232           chosen_class = klass;
 233           break;
 234         }
 235       else
 236         g_type_class_unref (klass);
 237     }
 238
 239   if (chosen_class)
 240     {
 241       *ret = chosen_class;
 242       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 243     }
 244   else
 245     return (gpointer)G_TYPE_INVALID;
 246 }
 247
 248 /**
 249  * _g_local_directory_monitor_new:
 250  * @dirname: filename of the directory to monitor.
 251  * @flags: #GFileMonitorFlags.
 252  *
 253  * Returns: new #GFileMonitor for the given @dirname.
 254  **/
 255 GFileMonitor*
 256 _g_local_directory_monitor_new (const char         *dirname,
 257                                 GFileMonitorFlags   flags,
 258                                 GError            **error)
 259 {
 260   static GOnce once_init = G_ONCE_INIT;
 261   GTypeClass *type_class;
 262   GFileMonitor *monitor;
 263   GType type;
 264
 265   type_class = NULL;
 266   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 267   type = (GType)once_init.retval;
 268
 269   monitor = NULL;
 270   if (type != G_TYPE_INVALID)
 271     monitor = G_FILE_MONITOR (g_object_new (type, "dirname", dirname, NULL));
 272   else
 273     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 274                          _("Unable to find default local directory monitor type"));
 275
 276   /* This is non-null on first pass here. Unref the class now.
 277    * This is to avoid unloading the module and then loading it
 278    * again which would happen if we unrefed the class
 279    * before creating the monitor.
 280    */
 281
 282   if (type_class)
 283     g_type_class_unref (type_class);
 284
 285   return monitor;
 286 }
 287
 288 static gboolean
 289 g_local_directory_monitor_cancel (GFileMonitor *monitor)
 290 {
 291   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 292
 293   if (local_monitor->mount_monitor)
 294     {
 295       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 296       g_object_unref (local_monitor->mount_monitor);
 297       local_monitor->mount_monitor = NULL;
 298     }
 299
 300   return TRUE;
 301 }
 302
 303 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 304 #include "gioaliasdef.c"