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, gpointer user_data);
  42
  43 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_FILE_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   GFileMonitorClass *file_monitor_class = G_FILE_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   file_monitor_class->cancel = g_local_directory_monitor_cancel;
 149
 150   g_object_class_install_property (gobject_class,
 151                                    PROP_DIRNAME,
 152                                    g_param_spec_string ("dirname",
 153                                                         P_("Directory name"),
 154                                                         P_("Directory to monitor"),
 155                                                         NULL,
 156                                                         G_PARAM_CONSTRUCT_ONLY|
 157                                                         G_PARAM_WRITABLE|
 158                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 159
 160   klass->mount_notify = FALSE;
 161 }
 162
 163 static void
 164 g_local_directory_monitor_init (GLocalDirectoryMonitor* local_monitor)
 165 {
 166 }
 167
 168 static void
 169 mounts_changed (GUnixMountMonitor *mount_monitor,
 170                 gpointer           user_data)
 171 {
 172   GLocalDirectoryMonitor *local_monitor = user_data;
 173   GUnixMountEntry *mount;
 174   gboolean is_mounted;
 175   GFile *file;
 176
 177   /* Emulate unmount detection */
 178 #ifdef G_OS_WIN32
 179   mount = NULL;
 180   g_warning ("G_OS_WIN32: no mount emulation");
 181 #else
 182   mount = g_unix_mount_at (local_monitor->dirname, NULL);
 183
 184   is_mounted = mount != NULL;
 185
 186   if (mount)
 187     g_unix_mount_free (mount);
 188 #endif
 189
 190   if (local_monitor->was_mounted != is_mounted)
 191     {
 192       if (local_monitor->was_mounted && !is_mounted)
 193         {
 194           file = g_file_new_for_path (local_monitor->dirname);
 195           g_file_monitor_emit_event (G_FILE_MONITOR (local_monitor),
 196                                      file, NULL,
 197                                      G_FILE_MONITOR_EVENT_UNMOUNTED);
 198           g_object_unref (file);
 199         }
 200       local_monitor->was_mounted = is_mounted;
 201     }
 202 }
 203
 204 static gint
 205 _compare_monitor_type_by_prio (gconstpointer _a,
 206                                gconstpointer _b,
 207                                gpointer      user_data)
 208 {
 209   const GType *a = _a, *b = _b;
 210   int prio_a, prio_b;
 211   gint ret;
 212   GQuark private_q;
 213
 214   private_q = g_quark_from_static_string ("gio-prio");
 215
 216   prio_a = GPOINTER_TO_INT (g_type_get_qdata (*a, private_q));
 217   prio_b = GPOINTER_TO_INT (g_type_get_qdata (*b, private_q));
 218
 219   ret = prio_b - prio_a;
 220
 221   return ret;
 222 }
 223
 224 static gpointer
 225 get_default_local_directory_monitor (gpointer data)
 226 {
 227   GType *monitor_impls;
 228   guint n_monitor_impls;
 229   gint i;
 230   GLocalDirectoryMonitorClass *chosen_class;
 231   GLocalDirectoryMonitorClass **ret = data;
 232
 233   _g_io_modules_ensure_loaded ();
 234
 235   monitor_impls = g_type_children (G_TYPE_LOCAL_DIRECTORY_MONITOR,
 236                                    &n_monitor_impls);
 237
 238   g_qsort_with_data (monitor_impls,
 239                      n_monitor_impls,
 240                      sizeof (GType),
 241                      _compare_monitor_type_by_prio,
 242                      NULL);
 243
 244   chosen_class = NULL;
 245   for (i = 0; i < n_monitor_impls; i++)
 246     {
 247       GLocalDirectoryMonitorClass *klass;
 248
 249       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (monitor_impls[i]));
 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   g_free (monitor_impls);
 261
 262   if (chosen_class)
 263     {
 264       *ret = chosen_class;
 265       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 266     }
 267   else
 268     return (gpointer)G_TYPE_INVALID;
 269 }
 270
 271 /**
 272  * g_local_directory_monitor_new:
 273  * @dirname: filename of the directory to monitor.
 274  * @flags: #GFileMonitorFlags.
 275  *
 276  * Returns: new #GFileMonitor for the given @dirname.
 277  **/
 278 GFileMonitor*
 279 _g_local_directory_monitor_new (const char         *dirname,
 280                                 GFileMonitorFlags   flags,
 281                                 GError            **error)
 282 {
 283   static GOnce once_init = G_ONCE_INIT;
 284   GTypeClass *type_class;
 285   GFileMonitor *monitor;
 286   GType type;
 287
 288   type_class = NULL;
 289   g_once (&once_init, get_default_local_directory_monitor, &type_class);
 290   type = (GType)once_init.retval;
 291
 292   monitor = NULL;
 293   if (type != G_TYPE_INVALID)
 294     monitor = G_FILE_MONITOR (g_object_new (type, "dirname", dirname, NULL));
 295   else
 296     g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Unable to find default local directory monitor type"));
 297
 298   /* This is non-null on first pass here. Unref the class now.
 299    * This is to avoid unloading the module and then loading it
 300    * again which would happen if we unrefed the class
 301    * before creating the monitor.
 302    */
 303
 304   if (type_class)
 305     g_type_class_unref (type_class);
 306
 307   return monitor;
 308 }
 309
 310 static gboolean
 311 g_local_directory_monitor_cancel (GFileMonitor* monitor)
 312 {
 313   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 314
 315   if (local_monitor->mount_monitor)
 316     {
 317       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 318       g_object_unref (local_monitor->mount_monitor);
 319       local_monitor->mount_monitor = NULL;
 320     }
 321
 322   return TRUE;
 323 }
 324
 325 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 326 #include "gioaliasdef.c"