gio/inotify/ginotifyfilemonitor.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  * Copyright (C) 2007 Sebastian Dröge.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  *
  21  * Authors: Alexander Larsson <alexl@redhat.com>
  22  *          John McCutchan <john@johnmccutchan.com>
  23  *          Sebastian Dröge <slomo@circular-chaos.org>
  24  */
  25
  26 #include "config.h"
  27
  28 #include "ginotifyfilemonitor.h"
  29 #include <gio/giomodule.h>
  30
  31 #define USE_INOTIFY 1
  32 #include "inotify-helper.h"
  33
  34 struct _GInotifyFileMonitor
  35 {
  36   GLocalFileMonitor parent_instance;
  37   gchar *filename;
  38   gchar *dirname;
  39   inotify_sub *sub;
  40   gboolean pair_moves;
  41 };
  42
  43 static gboolean g_inotify_file_monitor_cancel (GFileMonitor* monitor);
  44
  45 #define g_inotify_file_monitor_get_type _g_inotify_file_monitor_get_type
  46 G_DEFINE_TYPE_WITH_CODE (GInotifyFileMonitor, g_inotify_file_monitor, G_TYPE_LOCAL_FILE_MONITOR,
  47                          g_io_extension_point_implement (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME,
  48                                                          g_define_type_id,
  49                                                          "inotify",
  50                                                          20))
  51
  52 static void
  53 g_inotify_file_monitor_finalize (GObject *object)
  54 {
  55   GInotifyFileMonitor *inotify_monitor = G_INOTIFY_FILE_MONITOR (object);
  56   inotify_sub *sub = inotify_monitor->sub;
  57
  58   if (sub)
  59     {
  60       _ih_sub_cancel (sub);
  61       _ih_sub_free (sub);
  62       inotify_monitor->sub = NULL;
  63     }
  64
  65   if (inotify_monitor->filename)
  66     {
  67       g_free (inotify_monitor->filename);
  68       inotify_monitor->filename = NULL;
  69     }
  70
  71   if (inotify_monitor->dirname)
  72     {
  73       g_free (inotify_monitor->dirname);
  74       inotify_monitor->dirname = NULL;
  75     }
  76
  77   if (G_OBJECT_CLASS (g_inotify_file_monitor_parent_class)->finalize)
  78     (*G_OBJECT_CLASS (g_inotify_file_monitor_parent_class)->finalize) (object);
  79 }
  80
  81 static GObject *
  82 g_inotify_file_monitor_constructor (GType                  type,
  83                                     guint                  n_construct_properties,
  84                                     GObjectConstructParam *construct_properties)
  85 {
  86   GObject *obj;
  87   GInotifyFileMonitorClass *klass;
  88   GObjectClass *parent_class;
  89   GInotifyFileMonitor *inotify_monitor;
  90   const gchar *filename = NULL;
  91   inotify_sub *sub = NULL;
  92   gboolean pair_moves;
  93   gboolean ret_ih_startup; /* return value of _ih_startup, for asserting */
  94
  95   klass = G_INOTIFY_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_INOTIFY_FILE_MONITOR));
  96   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  97   obj = parent_class->constructor (type,
  98                                    n_construct_properties,
  99                                    construct_properties);
 100
 101   inotify_monitor = G_INOTIFY_FILE_MONITOR (obj);
 102
 103   filename = G_LOCAL_FILE_MONITOR (obj)->filename;
 104
 105   g_assert (filename != NULL);
 106
 107   inotify_monitor->filename = g_path_get_basename (filename);
 108   inotify_monitor->dirname = g_path_get_dirname (filename);
 109
 110   /* Will never fail as is_supported() should be called before instanciating
 111    * anyway */
 112   /* assert on return value */
 113   ret_ih_startup = _ih_startup();
 114   g_assert (ret_ih_startup);
 115
 116   pair_moves = G_LOCAL_FILE_MONITOR (obj)->flags & G_FILE_MONITOR_SEND_MOVED;
 117
 118   sub = _ih_sub_new (inotify_monitor->dirname,
 119                      inotify_monitor->filename,
 120                      pair_moves,
 121                      inotify_monitor);
 122
 123   /* FIXME: what to do about errors here? we can't return NULL or another
 124    * kind of error and an assertion is probably too hard */
 125   g_assert (sub != NULL);
 126
 127   /* _ih_sub_add allways returns TRUE, see gio/inotify/inotify-helper.c line 109
 128    * g_assert (_ih_sub_add (sub)); */
 129   _ih_sub_add (sub);
 130
 131   inotify_monitor->sub = sub;
 132
 133   return obj;
 134 }
 135
 136 static gboolean
 137 g_inotify_file_monitor_is_supported (void)
 138 {
 139   return _ih_startup ();
 140 }
 141
 142 static void
 143 g_inotify_file_monitor_class_init (GInotifyFileMonitorClass* klass)
 144 {
 145   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 146   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 147   GLocalFileMonitorClass *local_file_monitor_class = G_LOCAL_FILE_MONITOR_CLASS (klass);
 148
 149   gobject_class->finalize = g_inotify_file_monitor_finalize;
 150   gobject_class->constructor = g_inotify_file_monitor_constructor;
 151   file_monitor_class->cancel = g_inotify_file_monitor_cancel;
 152
 153   local_file_monitor_class->is_supported = g_inotify_file_monitor_is_supported;
 154 }
 155
 156 static void
 157 g_inotify_file_monitor_init (GInotifyFileMonitor* monitor)
 158 {
 159 }
 160
 161 static gboolean
 162 g_inotify_file_monitor_cancel (GFileMonitor* monitor)
 163 {
 164   GInotifyFileMonitor *inotify_monitor = G_INOTIFY_FILE_MONITOR (monitor);
 165   inotify_sub *sub = inotify_monitor->sub;
 166
 167   if (sub)
 168     {
 169       _ih_sub_cancel (sub);
 170       _ih_sub_free (sub);
 171       inotify_monitor->sub = NULL;
 172     }
 173
 174   if (G_FILE_MONITOR_CLASS (g_inotify_file_monitor_parent_class)->cancel)
 175     (*G_FILE_MONITOR_CLASS (g_inotify_file_monitor_parent_class)->cancel) (monitor);
 176
 177   return TRUE;
 178 }