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   PROP_FLAGS
  41 };
  42
  43 static gboolean g_local_directory_monitor_cancel (GFileMonitor      *monitor);
  44 static void     mounts_changed                   (GUnixMountMonitor *mount_monitor,
  45                                                   gpointer           user_data);
  46
  47 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_FILE_MONITOR)
  48
  49 static void
  50 g_local_directory_monitor_finalize (GObject *object)
  51 {
  52   GLocalDirectoryMonitor *local_monitor;
  53   local_monitor = G_LOCAL_DIRECTORY_MONITOR (object);
  54
  55   g_free (local_monitor->dirname);
  56
  57   if (local_monitor->mount_monitor)
  58     {
  59       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
  60       g_object_unref (local_monitor->mount_monitor);
  61       local_monitor->mount_monitor = NULL;
  62     }
  63
  64   G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize (object);
  65 }
  66
  67 static void
  68 g_local_directory_monitor_set_property (GObject      *object,
  69                                         guint         property_id,
  70                                         const GValue *value,
  71                                         GParamSpec   *pspec)
  72 {
  73   switch (property_id)
  74   {
  75     case PROP_DIRNAME:
  76       /* Do nothing */
  77       break;
  78     case PROP_FLAGS:
  79       /* Do nothing */
  80       break;
  81     default:
  82       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  83       break;
  84   }
  85 }
  86
  87 static GObject *
  88 g_local_directory_monitor_constructor (GType                  type,
  89                                        guint                  n_construct_properties,
  90                                        GObjectConstructParam *construct_properties)
  91 {
  92   GObject *obj;
  93   GLocalDirectoryMonitorClass *klass;
  94   GObjectClass *parent_class;
  95   GLocalDirectoryMonitor *local_monitor;
  96   GFileMonitorFlags  flags = 0;
  97   const gchar *dirname = NULL;
  98   gint i;
  99
 100   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
 101   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
 102   obj = parent_class->constructor (type,
 103                                    n_construct_properties,
 104                                    construct_properties);
 105
 106   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
 107
 108   for (i = 0; i < n_construct_properties; i++)
 109     {
 110       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 111         {
 112           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 113           dirname = g_value_get_string (construct_properties[i].value);
 114         }
 115       if (strcmp ("flags", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 116         {
 117           g_warn_if_fail (G_VALUE_HOLDS_FLAGS (construct_properties[i].value));
 118           flags = g_value_get_flags (construct_properties[i].value);
 119         }
 120     }
 121
 122   local_monitor->dirname = g_strdup (dirname);
 123   local_monitor->flags = flags;
 124
 125   if (!klass->mount_notify &&
 126       (flags & G_FILE_MONITOR_WATCH_MOUNTS))
 127     {
 128 #ifdef G_OS_WIN32
 129       /*claim everything was mounted */
 130       local_monitor->was_mounted = TRUE;
 131 #else
 132       GUnixMountEntry *mount;
 133
 134       /* Emulate unmount detection */
 135
 136       mount = g_unix_mount_at (local_monitor->dirname, NULL);
 137
 138       local_monitor->was_mounted = mount != NULL;
 139
 140       if (mount)
 141         g_unix_mount_free (mount);
 142
 143       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 144       g_signal_connect_object (local_monitor->mount_monitor, "mounts-changed",
 145                                G_CALLBACK (mounts_changed), local_monitor, 0);
 146 #endif
 147     }
 148
 149   return obj;
 150 }
 151
 152 static void
 153 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 154 {
 155   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 156   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 157
 158   gobject_class->finalize = g_local_directory_monitor_finalize;
 159   gobject_class->set_property = g_local_directory_monitor_set_property;
 160   gobject_class->constructor = g_local_directory_monitor_constructor;
 161
 162   file_monitor_class->cancel = g_local_directory_monitor_cancel;
 163
 164   g_object_class_install_property (gobject_class,
 165                                    PROP_DIRNAME,
 166                                    g_param_spec_string ("dirname",
 167                                                         P_("Directory name"),
 168                                                         P_("Directory to monitor"),
 169                                                         NULL,
 170                                                         G_PARAM_CONSTRUCT_ONLY|
 171                                                         G_PARAM_WRITABLE|
 172                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 173   g_object_class_install_property (gobject_class,
 174                                    PROP_FLAGS,
 175                                    g_param_spec_flags ("flags",
 176                                                        P_("Monitor flags"),
 177                                                        P_("Monitor flags"),
 178                                                        G_TYPE_FILE_MONITOR_FLAGS,
 179                                                        0,
 180                                                        G_PARAM_CONSTRUCT_ONLY|
 181                                                        G_PARAM_WRITABLE|
 182                                                        G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 183
 184   klass->mount_notify = FALSE;
 185 }
 186
 187 static void
 188 g_local_directory_monitor_init (GLocalDirectoryMonitor *local_monitor)
 189 {
 190 }
 191
 192 static void
 193 mounts_changed (GUnixMountMonitor *mount_monitor,
 194                 gpointer           user_data)
 195 {
 196   GLocalDirectoryMonitor *local_monitor = user_data;
 197   GUnixMountEntry *mount;
 198   gboolean is_mounted;
 199   GFile *file;
 200
 201   /* Emulate unmount detection */
 202 #ifdef G_OS_WIN32
 203   mount = NULL;
 204   /*claim everything was mounted */
 205   is_mounted = TRUE;
 206 #else
 207   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 208
 209   is_mounted = mount != NULL;
 210
 211   if (mount)
 212     g_unix_mount_free (mount);
 213 #endif
 214
 215   if (local_monitor->was_mounted != is_mounted)
 216     {
 217       if (local_monitor->was_mounted && !is_mounted)
 218         {
 219           file = g_file_new_for_path (local_monitor->dirname);
 220           g_file_monitor_emit_event (G_FILE_MONITOR (local_monitor),
 221                                      file, NULL,
 222                                      G_FILE_MONITOR_EVENT_UNMOUNTED);
 223           g_object_unref (file);
 224         }
 225       local_monitor->was_mounted = is_mounted;
 226     }
 227 }
 228
 229 static gpointer
 230 get_default_local_directory_monitor (gpointer data)
 231 {
 232   GLocalDirectoryMonitorClass *chosen_class;
 233   GLocalDirectoryMonitorClass **ret = data;
 234   GIOExtensionPoint *ep;
 235   GList *extensions, *l;
 236
 237   _g_io_modules_ensure_loaded ();
 238
 239   ep = g_io_extension_point_lookup (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
 240
 241   extensions = g_io_extension_point_get_extensions (ep);
 242
 243   chosen_class = NULL;
 244   for (l = extensions; l != NULL; l = l->next)
 245     {
 246       GIOExtension *extension = l->data;
 247       GLocalDirectoryMonitorClass *klass;
 248
 249       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_io_extension_ref_class (extension));
 250
 251       if (klass->is_supported ())
 252         {
 253           chosen_class = klass;
 254           break;
 255         }
 256       else
 257         g_type_class_unref (klass);
 258     }
 259
 260   if (chosen_class)
 261     {
 262       *ret = chosen_class;
 263       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 264     }
 265   else
 266     return (gpointer)G_TYPE_INVALID;
 267 }
 268
 269 /**
 270  * _g_local_directory_monitor_new:
 271  * @dirname: filename of the directory to monitor.
 272  * @flags: #GFileMonitorFlags.
 273  *
 274  * Returns: new #GFileMonitor for the given @dirname.
 275  **/
 276 GFileMonitor*
 277 _g_local_directory_monitor_new (const char         *dirname,
 278                                 GFileMonitorFlags   flags,
 279                                 GError            **error)
 280 {
 281   static GOnce once_init = G_ONCE_INIT;
 282   GTypeClass *type_class;
 283   GFileMonitor *monitor;
 284   GType type;
 285
 286   type_class = NULL;
 287   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 288   type = (GType)once_init.retval;
 289
 290   monitor = NULL;
 291   if (type != G_TYPE_INVALID)
 292     monitor = G_FILE_MONITOR (g_object_new (type, "dirname", dirname, "flags", flags, NULL));
 293   else
 294     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 295                          _("Unable to find default local directory monitor type"));
 296
 297   /* This is non-null on first pass here. Unref the class now.
 298    * This is to avoid unloading the module and then loading it
 299    * again which would happen if we unrefed the class
 300    * before creating the monitor.
 301    */
 302
 303   if (type_class)
 304     g_type_class_unref (type_class);
 305
 306   return monitor;
 307 }
 308
 309 static gboolean
 310 g_local_directory_monitor_cancel (GFileMonitor *monitor)
 311 {
 312   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 313
 314   if (local_monitor->mount_monitor)
 315     {
 316       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 317       g_object_unref (local_monitor->mount_monitor);
 318       local_monitor->mount_monitor = NULL;
 319     }
 320
 321   return TRUE;
 322 }
 323
 324 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 325 #include "gioaliasdef.c"