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
  35 enum
  36 {
  37   PROP_0,
  38   PROP_DIRNAME,
  39   PROP_FLAGS
  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     case PROP_FLAGS:
  78       /* Do nothing */
  79       break;
  80     default:
  81       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  82       break;
  83   }
  84 }
  85
  86 static GObject *
  87 g_local_directory_monitor_constructor (GType                  type,
  88                                        guint                  n_construct_properties,
  89                                        GObjectConstructParam *construct_properties)
  90 {
  91   GObject *obj;
  92   GLocalDirectoryMonitorClass *klass;
  93   GObjectClass *parent_class;
  94   GLocalDirectoryMonitor *local_monitor;
  95   GFileMonitorFlags  flags = 0;
  96   const gchar *dirname = NULL;
  97   gint i;
  98
  99   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
 100   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
 101   obj = parent_class->constructor (type,
 102                                    n_construct_properties,
 103                                    construct_properties);
 104
 105   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
 106
 107   for (i = 0; i < n_construct_properties; i++)
 108     {
 109       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 110         {
 111           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 112           dirname = g_value_get_string (construct_properties[i].value);
 113         }
 114       if (strcmp ("flags", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 115         {
 116           g_warn_if_fail (G_VALUE_HOLDS_FLAGS (construct_properties[i].value));
 117           flags = g_value_get_flags (construct_properties[i].value);
 118         }
 119     }
 120
 121   local_monitor->dirname = g_strdup (dirname);
 122   local_monitor->flags = flags;
 123
 124   if (!klass->mount_notify &&
 125       (flags & G_FILE_MONITOR_WATCH_MOUNTS))
 126     {
 127 #ifdef G_OS_WIN32
 128       /*claim everything was mounted */
 129       local_monitor->was_mounted = TRUE;
 130 #else
 131       GUnixMountEntry *mount;
 132
 133       /* Emulate unmount detection */
 134
 135       mount = g_unix_mount_at (local_monitor->dirname, NULL);
 136
 137       local_monitor->was_mounted = mount != NULL;
 138
 139       if (mount)
 140         g_unix_mount_free (mount);
 141
 142       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 143       g_signal_connect_object (local_monitor->mount_monitor, "mounts-changed",
 144                                G_CALLBACK (mounts_changed), local_monitor, 0);
 145 #endif
 146     }
 147
 148   return obj;
 149 }
 150
 151 static void
 152 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 153 {
 154   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 155   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 156
 157   gobject_class->finalize = g_local_directory_monitor_finalize;
 158   gobject_class->set_property = g_local_directory_monitor_set_property;
 159   gobject_class->constructor = g_local_directory_monitor_constructor;
 160
 161   file_monitor_class->cancel = g_local_directory_monitor_cancel;
 162
 163   g_object_class_install_property (gobject_class,
 164                                    PROP_DIRNAME,
 165                                    g_param_spec_string ("dirname",
 166                                                         P_("Directory name"),
 167                                                         P_("Directory to monitor"),
 168                                                         NULL,
 169                                                         G_PARAM_CONSTRUCT_ONLY|
 170                                                         G_PARAM_WRITABLE|
 171                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 172   g_object_class_install_property (gobject_class,
 173                                    PROP_FLAGS,
 174                                    g_param_spec_flags ("flags",
 175                                                        P_("Monitor flags"),
 176                                                        P_("Monitor flags"),
 177                                                        G_TYPE_FILE_MONITOR_FLAGS,
 178                                                        0,
 179                                                        G_PARAM_CONSTRUCT_ONLY|
 180                                                        G_PARAM_WRITABLE|
 181                                                        G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 182
 183   klass->mount_notify = FALSE;
 184 }
 185
 186 static void
 187 g_local_directory_monitor_init (GLocalDirectoryMonitor *local_monitor)
 188 {
 189 }
 190
 191 static void
 192 mounts_changed (GUnixMountMonitor *mount_monitor,
 193                 gpointer           user_data)
 194 {
 195   GLocalDirectoryMonitor *local_monitor = user_data;
 196   GUnixMountEntry *mount;
 197   gboolean is_mounted;
 198   GFile *file;
 199
 200   /* Emulate unmount detection */
 201 #ifdef G_OS_WIN32
 202   mount = NULL;
 203   /*claim everything was mounted */
 204   is_mounted = TRUE;
 205 #else
 206   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 207
 208   is_mounted = mount != NULL;
 209
 210   if (mount)
 211     g_unix_mount_free (mount);
 212 #endif
 213
 214   if (local_monitor->was_mounted != is_mounted)
 215     {
 216       if (local_monitor->was_mounted && !is_mounted)
 217         {
 218           file = g_file_new_for_path (local_monitor->dirname);
 219           g_file_monitor_emit_event (G_FILE_MONITOR (local_monitor),
 220                                      file, NULL,
 221                                      G_FILE_MONITOR_EVENT_UNMOUNTED);
 222           g_object_unref (file);
 223         }
 224       local_monitor->was_mounted = is_mounted;
 225     }
 226 }
 227
 228 static gpointer
 229 get_default_local_directory_monitor (gpointer data)
 230 {
 231   GLocalDirectoryMonitorClass *chosen_class;
 232   GLocalDirectoryMonitorClass **ret = data;
 233   GIOExtensionPoint *ep;
 234   GList *extensions, *l;
 235
 236   _g_io_modules_ensure_loaded ();
 237
 238   ep = g_io_extension_point_lookup (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
 239
 240   extensions = g_io_extension_point_get_extensions (ep);
 241
 242   chosen_class = NULL;
 243   for (l = extensions; l != NULL; l = l->next)
 244     {
 245       GIOExtension *extension = l->data;
 246       GLocalDirectoryMonitorClass *klass;
 247
 248       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_io_extension_ref_class (extension));
 249
 250       if (klass->is_supported ())
 251         {
 252           chosen_class = klass;
 253           break;
 254         }
 255       else
 256         g_type_class_unref (klass);
 257     }
 258
 259   if (chosen_class)
 260     {
 261       *ret = chosen_class;
 262       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 263     }
 264   else
 265     return (gpointer)G_TYPE_INVALID;
 266 }
 267
 268 GFileMonitor*
 269 _g_local_directory_monitor_new (const char         *dirname,
 270                                 GFileMonitorFlags   flags,
 271                                 GError            **error)
 272 {
 273   static GOnce once_init = G_ONCE_INIT;
 274   GTypeClass *type_class;
 275   GFileMonitor *monitor;
 276   GType type;
 277
 278   type_class = NULL;
 279   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 280   type = (GType)once_init.retval;
 281
 282   monitor = NULL;
 283   if (type != G_TYPE_INVALID)
 284     monitor = G_FILE_MONITOR (g_object_new (type, "dirname", dirname, "flags", flags, NULL));
 285   else
 286     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 287                          _("Unable to find default local directory monitor type"));
 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 (GFileMonitor *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 }