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 "glibintl.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 (GFileMonitor      *monitor);
  41 static void     mounts_changed                   (GUnixMountMonitor *mount_monitor,
  42                                                   gpointer           user_data);
  43
  44 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_FILE_MONITOR)
  45
  46 static void
  47 g_local_directory_monitor_finalize (GObject *object)
  48 {
  49   GLocalDirectoryMonitor *local_monitor;
  50   local_monitor = G_LOCAL_DIRECTORY_MONITOR (object);
  51
  52   g_free (local_monitor->dirname);
  53
  54   if (local_monitor->mount_monitor)
  55     {
  56       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
  57       g_object_unref (local_monitor->mount_monitor);
  58       local_monitor->mount_monitor = NULL;
  59     }
  60
  61   if (G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize)
  62     (*G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize) (object);
  63 }
  64
  65 static void
  66 g_local_directory_monitor_set_property (GObject      *object,
  67                                         guint         property_id,
  68                                         const GValue *value,
  69                                         GParamSpec   *pspec)
  70 {
  71   switch (property_id)
  72   {
  73     case PROP_DIRNAME:
  74       /* Do nothing */
  75       break;
  76     default:
  77       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  78       break;
  79   }
  80 }
  81
  82 static GObject *
  83 g_local_directory_monitor_constructor (GType                  type,
  84                                        guint                  n_construct_properties,
  85                                        GObjectConstructParam *construct_properties)
  86 {
  87   GObject *obj;
  88   GLocalDirectoryMonitorClass *klass;
  89   GObjectClass *parent_class;
  90   GLocalDirectoryMonitor *local_monitor;
  91   const gchar *dirname = NULL;
  92   gint i;
  93
  94   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
  95   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  96   obj = parent_class->constructor (type,
  97                                    n_construct_properties,
  98                                    construct_properties);
  99
 100   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
 101
 102   for (i = 0; i < n_construct_properties; i++)
 103     {
 104       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 105         {
 106           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 107           dirname = g_value_get_string (construct_properties[i].value);
 108           break;
 109         }
 110     }
 111
 112   local_monitor->dirname = g_strdup (dirname);
 113
 114   if (!klass->mount_notify)
 115     {
 116 #ifdef G_OS_WIN32
 117       g_warning ("G_OS_WIN32: no mount emulation");
 118 #else
 119       GUnixMountEntry *mount;
 120
 121       /* Emulate unmount detection */
 122
 123       mount = g_unix_mount_at (local_monitor->dirname, NULL);
 124
 125       local_monitor->was_mounted = mount != NULL;
 126
 127       if (mount)
 128         g_unix_mount_free (mount);
 129
 130       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 131       g_signal_connect_object (local_monitor->mount_monitor, "mounts_changed",
 132                                G_CALLBACK (mounts_changed), local_monitor, 0);
 133 #endif
 134     }
 135
 136   return obj;
 137 }
 138
 139 static void
 140 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 141 {
 142   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 143   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 144
 145   gobject_class->finalize = g_local_directory_monitor_finalize;
 146   gobject_class->set_property = g_local_directory_monitor_set_property;
 147   gobject_class->constructor = g_local_directory_monitor_constructor;
 148
 149   file_monitor_class->cancel = g_local_directory_monitor_cancel;
 150
 151   g_object_class_install_property (gobject_class,
 152                                    PROP_DIRNAME,
 153                                    g_param_spec_string ("dirname",
 154                                                         P_("Directory name"),
 155                                                         P_("Directory to monitor"),
 156                                                         NULL,
 157                                                         G_PARAM_CONSTRUCT_ONLY|
 158                                                         G_PARAM_WRITABLE|
 159                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 160
 161   klass->mount_notify = FALSE;
 162 }
 163
 164 static void
 165 g_local_directory_monitor_init (GLocalDirectoryMonitor *local_monitor)
 166 {
 167 }
 168
 169 static void
 170 mounts_changed (GUnixMountMonitor *mount_monitor,
 171                 gpointer           user_data)
 172 {
 173   GLocalDirectoryMonitor *local_monitor = user_data;
 174   GUnixMountEntry *mount;
 175   gboolean is_mounted;
 176   GFile *file;
 177
 178   /* Emulate unmount detection */
 179 #ifdef G_OS_WIN32
 180   mount = NULL;
 181   g_warning ("G_OS_WIN32: no mount emulation");
 182 #else
 183   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 184
 185   is_mounted = mount != NULL;
 186
 187   if (mount)
 188     g_unix_mount_free (mount);
 189 #endif
 190
 191   if (local_monitor->was_mounted != is_mounted)
 192     {
 193       if (local_monitor->was_mounted && !is_mounted)
 194         {
 195           file = g_file_new_for_path (local_monitor->dirname);
 196           g_file_monitor_emit_event (G_FILE_MONITOR (local_monitor),
 197                                      file, NULL,
 198                                      G_FILE_MONITOR_EVENT_UNMOUNTED);
 199           g_object_unref (file);
 200         }
 201       local_monitor->was_mounted = is_mounted;
 202     }
 203 }
 204
 205 static gpointer
 206 get_default_local_directory_monitor (gpointer data)
 207 {
 208   GLocalDirectoryMonitorClass *chosen_class;
 209   GLocalDirectoryMonitorClass **ret = data;
 210   GIOExtensionPoint *ep;
 211   GList *extensions, *l;
 212
 213   _g_io_modules_ensure_loaded ();
 214
 215   ep = g_io_extension_point_lookup (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
 216
 217   extensions = g_io_extension_point_get_extensions (ep);
 218
 219   chosen_class = NULL;
 220   for (l = extensions; l != NULL; l = l->next)
 221     {
 222       GIOExtension *extension = l->data;
 223       GLocalDirectoryMonitorClass *klass;
 224
 225       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_io_extension_ref_class (extension));
 226
 227       if (klass->is_supported ())
 228         {
 229           chosen_class = klass;
 230           break;
 231         }
 232       else
 233         g_type_class_unref (klass);
 234     }
 235
 236   if (chosen_class)
 237     {
 238       *ret = chosen_class;
 239       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 240     }
 241   else
 242     return (gpointer)G_TYPE_INVALID;
 243 }
 244
 245 /**
 246  * _g_local_directory_monitor_new:
 247  * @dirname: filename of the directory to monitor.
 248  * @flags: #GFileMonitorFlags.
 249  *
 250  * Returns: new #GFileMonitor for the given @dirname.
 251  **/
 252 GFileMonitor*
 253 _g_local_directory_monitor_new (const char         *dirname,
 254                                 GFileMonitorFlags   flags,
 255                                 GError            **error)
 256 {
 257   static GOnce once_init = G_ONCE_INIT;
 258   GTypeClass *type_class;
 259   GFileMonitor *monitor;
 260   GType type;
 261
 262   type_class = NULL;
 263   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 264   type = (GType)once_init.retval;
 265
 266   monitor = NULL;
 267   if (type != G_TYPE_INVALID)
 268     monitor = G_FILE_MONITOR (g_object_new (type, "dirname", dirname, NULL));
 269   else
 270     g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Unable to find default local directory monitor type"));
 271
 272   /* This is non-null on first pass here. Unref the class now.
 273    * This is to avoid unloading the module and then loading it
 274    * again which would happen if we unrefed the class
 275    * before creating the monitor.
 276    */
 277
 278   if (type_class)
 279     g_type_class_unref (type_class);
 280
 281   return monitor;
 282 }
 283
 284 static gboolean
 285 g_local_directory_monitor_cancel (GFileMonitor *monitor)
 286 {
 287   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 288
 289   if (local_monitor->mount_monitor)
 290     {
 291       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 292       g_object_unref (local_monitor->mount_monitor);
 293       local_monitor->mount_monitor = NULL;
 294     }
 295
 296   return TRUE;
 297 }
 298
 299 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 300 #include "gioaliasdef.c"