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 "gdirectorymonitor.h"
  28 #include "giomodule.h"
  29
  30 #include <string.h>
  31
  32 enum
  33 {
  34   PROP_0,
  35   PROP_DIRNAME
  36 };
  37
  38 static gboolean g_local_directory_monitor_cancel (GDirectoryMonitor* monitor);
  39 static void mounts_changed (GUnixMountMonitor *mount_monitor, gpointer user_data);
  40
  41 G_DEFINE_ABSTRACT_TYPE (GLocalDirectoryMonitor, g_local_directory_monitor, G_TYPE_DIRECTORY_MONITOR)
  42
  43 static void
  44 g_local_directory_monitor_finalize (GObject* object)
  45 {
  46   GLocalDirectoryMonitor* local_monitor;
  47   local_monitor = G_LOCAL_DIRECTORY_MONITOR (object);
  48
  49   g_free (local_monitor->dirname);
  50
  51   if (local_monitor->mount_monitor)
  52     {
  53       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
  54       g_object_unref (local_monitor->mount_monitor);
  55       local_monitor->mount_monitor = NULL;
  56     }
  57
  58   if (G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize)
  59     (*G_OBJECT_CLASS (g_local_directory_monitor_parent_class)->finalize) (object);
  60 }
  61
  62 static void
  63 g_local_directory_monitor_set_property (GObject *object,
  64                                    guint property_id,
  65                                    const GValue *value,
  66                                    GParamSpec *pspec)
  67 {
  68   switch (property_id)
  69   {
  70     case PROP_DIRNAME:
  71       /* Do nothing */
  72       break;
  73     default:
  74       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  75       break;
  76   }
  77 }
  78
  79 static GObject *
  80 g_local_directory_monitor_constructor (GType type,
  81                                     guint n_construct_properties,
  82                                     GObjectConstructParam *construct_properties)
  83 {
  84   GObject *obj;
  85   GLocalDirectoryMonitorClass *klass;
  86   GObjectClass *parent_class;
  87   GLocalDirectoryMonitor *local_monitor;
  88   const gchar *dirname = NULL;
  89   gint i;
  90
  91   klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_DIRECTORY_MONITOR));
  92   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  93   obj = parent_class->constructor (type,
  94                                    n_construct_properties,
  95                                    construct_properties);
  96
  97   local_monitor = G_LOCAL_DIRECTORY_MONITOR (obj);
  98
  99   for (i = 0; i < n_construct_properties; i++)
 100     {
 101       if (strcmp ("dirname", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
 102         {
 103           g_assert (G_VALUE_HOLDS_STRING (construct_properties[i].value));
 104           dirname = g_value_get_string (construct_properties[i].value);
 105           break;
 106         }
 107     }
 108
 109   local_monitor->dirname = g_strdup (dirname);
 110
 111   if (!klass->mount_notify)
 112     {
 113       GUnixMount *mount;
 114
 115       /* Emulate unmount detection */
 116
 117       mount = g_get_unix_mount_at (local_monitor->dirname, NULL);
 118
 119       local_monitor->was_mounted = mount != NULL;
 120
 121       if (mount)
 122         g_unix_mount_free (mount);
 123
 124       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 125       g_signal_connect (local_monitor->mount_monitor, "mounts_changed",
 126         G_CALLBACK (mounts_changed), local_monitor);
 127     }
 128
 129   return obj;
 130 }
 131
 132 static void
 133 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 134 {
 135   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 136   GDirectoryMonitorClass *dir_monitor_class = G_DIRECTORY_MONITOR_CLASS (klass);
 137
 138   gobject_class->finalize = g_local_directory_monitor_finalize;
 139   gobject_class->set_property = g_local_directory_monitor_set_property;
 140   gobject_class->constructor = g_local_directory_monitor_constructor;
 141
 142   dir_monitor_class->cancel = g_local_directory_monitor_cancel;
 143
 144   g_object_class_install_property (gobject_class, PROP_DIRNAME,
 145     g_param_spec_string ("dirname", "Directory name", "Directory to monitor",
 146         NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
 147
 148   klass->mount_notify = FALSE;
 149 }
 150
 151 static void
 152 g_local_directory_monitor_init (GLocalDirectoryMonitor* local_monitor)
 153 {
 154 }
 155
 156 static void
 157 mounts_changed (GUnixMountMonitor *mount_monitor,
 158                 gpointer user_data)
 159 {
 160   GLocalDirectoryMonitor *local_monitor = user_data;
 161   GUnixMount *mount;
 162   gboolean is_mounted;
 163   GFile *file;
 164
 165   /* Emulate unmount detection */
 166
 167   mount = g_get_unix_mount_at (local_monitor->dirname, NULL);
 168
 169   is_mounted = mount != NULL;
 170
 171   if (mount)
 172     g_unix_mount_free (mount);
 173
 174   if (local_monitor->was_mounted != is_mounted)
 175     {
 176       if (local_monitor->was_mounted && !is_mounted)
 177         {
 178           file = g_file_new_for_path (local_monitor->dirname);
 179           g_directory_monitor_emit_event (G_DIRECTORY_MONITOR (local_monitor),
 180                                           file, NULL,
 181                                           G_FILE_MONITOR_EVENT_UNMOUNTED);
 182           g_object_unref (file);
 183         }
 184       local_monitor->was_mounted = is_mounted;
 185     }
 186 }
 187
 188 static gint
 189 _compare_monitor_class_by_prio (gconstpointer a,
 190                                 gconstpointer b,
 191                                 gpointer user_data)
 192 {
 193   GType *type1 = (GType *) a, *type2 = (GType *) b;
 194   GLocalDirectoryMonitorClass *klass1, *klass2;
 195   gint ret;
 196
 197   klass1 = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (*type1));
 198   klass2 = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (*type2));
 199
 200   ret = klass1->prio - klass2->prio;
 201
 202   g_type_class_unref (klass1);
 203   g_type_class_unref (klass2);
 204
 205   return ret;
 206 }
 207
 208 extern GType g_inotify_directory_monitor_get_type (void);
 209
 210 static gpointer
 211 get_default_local_directory_monitor (gpointer data)
 212 {
 213   GType *monitor_impls, chosen_type;
 214   guint n_monitor_impls;
 215   GType *ret = (GType *) data;
 216   gint i;
 217
 218 #if defined(HAVE_SYS_INOTIFY_H) || defined(HAVE_LINUX_INOTIFY_H)
 219   /* Register Inotify monitor */
 220   g_inotify_directory_monitor_get_type ();
 221 #endif
 222
 223   g_io_modules_ensure_loaded (GIO_MODULE_DIR);
 224
 225   monitor_impls = g_type_children (G_TYPE_LOCAL_DIRECTORY_MONITOR,
 226                                    &n_monitor_impls);
 227
 228   chosen_type = G_TYPE_INVALID;
 229
 230   g_qsort_with_data (monitor_impls,
 231                      n_monitor_impls,
 232                      sizeof (GType),
 233                      _compare_monitor_class_by_prio,
 234                      NULL);
 235
 236   for (i = n_monitor_impls - 1; i >= 0 && chosen_type == G_TYPE_INVALID; i--)
 237     {
 238       GLocalDirectoryMonitorClass *klass;
 239
 240       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (monitor_impls[i]));
 241
 242       if (klass->is_supported())
 243         chosen_type = monitor_impls[i];
 244
 245       g_type_class_unref (klass);
 246     }
 247
 248   g_free (monitor_impls);
 249   *ret = chosen_type;
 250
 251   return NULL;
 252 }
 253
 254 /**
 255  * g_local_directory_monitor_new:
 256  * @dirname: filename of the directory to monitor.
 257  * @flags: #GFileMonitorFlags.
 258  *
 259  * Returns: new #GDirectoryMonitor for the given @dirname.
 260  **/
 261 GDirectoryMonitor*
 262 g_local_directory_monitor_new (const char* dirname,
 263                                GFileMonitorFlags flags)
 264 {
 265   static GOnce once_init = G_ONCE_INIT;
 266   static GType monitor_type = G_TYPE_INVALID;
 267
 268   g_once (&once_init, get_default_local_directory_monitor, &monitor_type);
 269
 270   if (monitor_type != G_TYPE_INVALID)
 271     return G_DIRECTORY_MONITOR (g_object_new (monitor_type, "dirname", dirname, NULL));
 272
 273   return NULL;
 274 }
 275
 276 static gboolean
 277 g_local_directory_monitor_cancel (GDirectoryMonitor* monitor)
 278 {
 279   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 280
 281   if (local_monitor->mount_monitor)
 282     {
 283       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 284       g_object_unref (local_monitor->mount_monitor);
 285       local_monitor->mount_monitor = NULL;
 286     }
 287
 288   return TRUE;
 289 }
 290