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 #include "gioalias.h"
  35
  36 struct _GInotifyFileMonitor
  37 {
  38   GLocalFileMonitor parent_instance;
  39   gchar *filename;
  40   gchar *dirname;
  41   inotify_sub *sub;
  42 };
  43
  44 static gboolean g_inotify_file_monitor_cancel (GFileMonitor* monitor);
  45
  46 #define g_inotify_file_monitor_get_type _g_inotify_file_monitor_get_type
  47 G_DEFINE_TYPE_WITH_CODE (GInotifyFileMonitor, g_inotify_file_monitor, G_TYPE_LOCAL_FILE_MONITOR,
  48                          g_io_extension_point_implement (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME,
  49                                                          g_define_type_id,
  50                                                          "inotify",
  51                                                          20))
  52
  53 static void
  54 g_inotify_file_monitor_finalize (GObject *object)
  55 {
  56   GInotifyFileMonitor *inotify_monitor = G_INOTIFY_FILE_MONITOR (object);
  57   inotify_sub *sub = inotify_monitor->sub;
  58
  59   if (sub)
  60     {
  61       _ih_sub_cancel (sub);
  62       _ih_sub_free (sub);
  63       inotify_monitor->sub = NULL;
  64     }
  65
  66   if (inotify_monitor->filename)
  67     {
  68       g_free (inotify_monitor->filename);
  69       inotify_monitor->filename = NULL;
  70     }
  71
  72   if (inotify_monitor->dirname)
  73     {
  74       g_free (inotify_monitor->dirname);
  75       inotify_monitor->dirname = NULL;
  76     }
  77
  78   if (G_OBJECT_CLASS (g_inotify_file_monitor_parent_class)->finalize)
  79     (*G_OBJECT_CLASS (g_inotify_file_monitor_parent_class)->finalize) (object);
  80 }
  81
  82 static GObject *
  83 g_inotify_file_monitor_constructor (GType                  type,
  84                                     guint                  n_construct_properties,
  85                                     GObjectConstructParam *construct_properties)
  86 {
  87   GObject *obj;
  88   GInotifyFileMonitorClass *klass;
  89   GObjectClass *parent_class;
  90   GInotifyFileMonitor *inotify_monitor;
  91   const gchar *filename = NULL;
  92   inotify_sub *sub = NULL;
  93
  94   klass = G_INOTIFY_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_INOTIFY_FILE_MONITOR));
  95   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  96   obj = parent_class->constructor (type,
  97                                    n_construct_properties,
  98                                    construct_properties);
  99
 100   inotify_monitor = G_INOTIFY_FILE_MONITOR (obj);
 101
 102   filename = G_LOCAL_FILE_MONITOR (obj)->filename;
 103
 104   g_assert (filename != NULL);
 105
 106   inotify_monitor->filename = g_path_get_basename (filename);
 107   inotify_monitor->dirname = g_path_get_dirname (filename);
 108
 109   /* Will never fail as is_supported() should be called before instanciating
 110    * anyway */
 111   g_assert (_ih_startup ());
 112
 113   sub = _ih_sub_new (inotify_monitor->dirname, inotify_monitor->filename, inotify_monitor);
 114
 115   /* FIXME: what to do about errors here? we can't return NULL or another
 116    * kind of error and an assertion is probably too hard */
 117   g_assert (sub != NULL);
 118   g_assert (_ih_sub_add (sub));
 119
 120   inotify_monitor->sub = sub;
 121
 122   return obj;
 123 }
 124
 125 static gboolean
 126 g_inotify_file_monitor_is_supported (void)
 127 {
 128   return _ih_startup ();
 129 }
 130
 131 static void
 132 g_inotify_file_monitor_class_init (GInotifyFileMonitorClass* klass)
 133 {
 134   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 135   GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 136   GLocalFileMonitorClass *local_file_monitor_class = G_LOCAL_FILE_MONITOR_CLASS (klass);
 137
 138   gobject_class->finalize = g_inotify_file_monitor_finalize;
 139   gobject_class->constructor = g_inotify_file_monitor_constructor;
 140   file_monitor_class->cancel = g_inotify_file_monitor_cancel;
 141
 142   local_file_monitor_class->is_supported = g_inotify_file_monitor_is_supported;
 143 }
 144
 145 static void
 146 g_inotify_file_monitor_init (GInotifyFileMonitor* monitor)
 147 {
 148 }
 149
 150 static gboolean
 151 g_inotify_file_monitor_cancel (GFileMonitor* monitor)
 152 {
 153   GInotifyFileMonitor *inotify_monitor = G_INOTIFY_FILE_MONITOR (monitor);
 154   inotify_sub *sub = inotify_monitor->sub;
 155
 156   if (sub)
 157     {
 158       _ih_sub_cancel (sub);
 159       _ih_sub_free (sub);
 160       inotify_monitor->sub = NULL;
 161     }
 162
 163   if (G_FILE_MONITOR_CLASS (g_inotify_file_monitor_parent_class)->cancel)
 164     (*G_FILE_MONITOR_CLASS (g_inotify_file_monitor_parent_class)->cancel) (monitor);
 165
 166   return TRUE;
 167 }
 168