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 #include "gioalias.h"
  33
  34 enum
  35 {
  36   PROP_0,
  37   PROP_DIRNAME
  38 };
  39
  40 static gboolean g_local_directory_monitor_cancel (GDirectoryMonitor* 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_DIRECTORY_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_assert (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       GUnixMount *mount;
 116
 117       /* Emulate unmount detection */
 118
 119       mount = g_get_unix_mount_at (local_monitor->dirname, NULL);
 120
 121       local_monitor->was_mounted = mount != NULL;
 122
 123       if (mount)
 124         g_unix_mount_free (mount);
 125
 126       local_monitor->mount_monitor = g_unix_mount_monitor_new ();
 127       g_signal_connect (local_monitor->mount_monitor, "mounts_changed",
 128         G_CALLBACK (mounts_changed), local_monitor);
 129     }
 130
 131   return obj;
 132 }
 133
 134 static void
 135 g_local_directory_monitor_class_init (GLocalDirectoryMonitorClass* klass)
 136 {
 137   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 138   GDirectoryMonitorClass *dir_monitor_class = G_DIRECTORY_MONITOR_CLASS (klass);
 139
 140   gobject_class->finalize = g_local_directory_monitor_finalize;
 141   gobject_class->set_property = g_local_directory_monitor_set_property;
 142   gobject_class->constructor = g_local_directory_monitor_constructor;
 143
 144   dir_monitor_class->cancel = g_local_directory_monitor_cancel;
 145
 146   g_object_class_install_property (gobject_class, PROP_DIRNAME,
 147     g_param_spec_string ("dirname", "Directory name", "Directory to monitor",
 148         NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
 149
 150   klass->mount_notify = FALSE;
 151 }
 152
 153 static void
 154 g_local_directory_monitor_init (GLocalDirectoryMonitor* local_monitor)
 155 {
 156 }
 157
 158 static void
 159 mounts_changed (GUnixMountMonitor *mount_monitor,
 160                 gpointer           user_data)
 161 {
 162   GLocalDirectoryMonitor *local_monitor = user_data;
 163   GUnixMount *mount;
 164   gboolean is_mounted;
 165   GFile *file;
 166
 167   /* Emulate unmount detection */
 168
 169   mount = g_get_unix_mount_at (local_monitor->dirname, NULL);
 170
 171   is_mounted = mount != NULL;
 172
 173   if (mount)
 174     g_unix_mount_free (mount);
 175
 176   if (local_monitor->was_mounted != is_mounted)
 177     {
 178       if (local_monitor->was_mounted && !is_mounted)
 179         {
 180           file = g_file_new_for_path (local_monitor->dirname);
 181           g_directory_monitor_emit_event (G_DIRECTORY_MONITOR (local_monitor),
 182                                           file, NULL,
 183                                           G_FILE_MONITOR_EVENT_UNMOUNTED);
 184           g_object_unref (file);
 185         }
 186       local_monitor->was_mounted = is_mounted;
 187     }
 188 }
 189
 190 static gint
 191 _compare_monitor_class_by_prio (gconstpointer a,
 192                                 gconstpointer b,
 193                                 gpointer      user_data)
 194 {
 195   GType *type1 = (GType *) a, *type2 = (GType *) b;
 196   GLocalDirectoryMonitorClass *klass1, *klass2;
 197   gint ret;
 198
 199   klass1 = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (*type1));
 200   klass2 = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (*type2));
 201
 202   ret = klass1->prio - klass2->prio;
 203
 204   g_type_class_unref (klass1);
 205   g_type_class_unref (klass2);
 206
 207   return ret;
 208 }
 209
 210 extern GType _g_inotify_directory_monitor_get_type (void);
 211
 212 static gpointer
 213 get_default_local_directory_monitor (gpointer data)
 214 {
 215   GType *monitor_impls, chosen_type;
 216   guint n_monitor_impls;
 217   GType *ret = (GType *) data;
 218   gint i;
 219
 220 #if defined(HAVE_SYS_INOTIFY_H) || defined(HAVE_LINUX_INOTIFY_H)
 221   /* Register Inotify monitor */
 222   _g_inotify_directory_monitor_get_type ();
 223 #endif
 224
 225   g_io_modules_ensure_loaded (GIO_MODULE_DIR);
 226
 227   monitor_impls = g_type_children (G_TYPE_LOCAL_DIRECTORY_MONITOR,
 228                                    &n_monitor_impls);
 229
 230   chosen_type = G_TYPE_INVALID;
 231
 232   g_qsort_with_data (monitor_impls,
 233                      n_monitor_impls,
 234                      sizeof (GType),
 235                      _compare_monitor_class_by_prio,
 236                      NULL);
 237
 238   for (i = n_monitor_impls - 1; i >= 0 && chosen_type == G_TYPE_INVALID; i--)
 239     {
 240       GLocalDirectoryMonitorClass *klass;
 241
 242       klass = G_LOCAL_DIRECTORY_MONITOR_CLASS (g_type_class_ref (monitor_impls[i]));
 243
 244       if (klass->is_supported())
 245         chosen_type = monitor_impls[i];
 246
 247       g_type_class_unref (klass);
 248     }
 249
 250   g_free (monitor_impls);
 251   *ret = chosen_type;
 252
 253   return NULL;
 254 }
 255
 256 /**
 257  * g_local_directory_monitor_new:
 258  * @dirname: filename of the directory to monitor.
 259  * @flags: #GFileMonitorFlags.
 260  *
 261  * Returns: new #GDirectoryMonitor for the given @dirname.
 262  **/
 263 GDirectoryMonitor*
 264 _g_local_directory_monitor_new (const char*       dirname,
 265                                 GFileMonitorFlags flags)
 266 {
 267   static GOnce once_init = G_ONCE_INIT;
 268   static GType monitor_type = G_TYPE_INVALID;
 269
 270   g_once (&once_init, get_default_local_directory_monitor, &monitor_type);
 271
 272   if (monitor_type != G_TYPE_INVALID)
 273     return G_DIRECTORY_MONITOR (g_object_new (monitor_type, "dirname", dirname, NULL));
 274
 275   return NULL;
 276 }
 277
 278 static gboolean
 279 g_local_directory_monitor_cancel (GDirectoryMonitor* monitor)
 280 {
 281   GLocalDirectoryMonitor *local_monitor = G_LOCAL_DIRECTORY_MONITOR (monitor);
 282
 283   if (local_monitor->mount_monitor)
 284     {
 285       g_signal_handlers_disconnect_by_func (local_monitor->mount_monitor, mounts_changed, local_monitor);
 286       g_object_unref (local_monitor->mount_monitor);
 287       local_monitor->mount_monitor = NULL;
 288     }
 289
 290   return TRUE;
 291 }
 292
 293 #define __G_LOCAL_DIRECTORY_MONITOR_C__
 294 #include "gioaliasdef.c"