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      1 /* GIO - GLib Input, Output and Streaming Library
      2  *
      3  * Copyright (C) 2006-2007 Red Hat, Inc.
      4  * Copyright (C) 2007 Sebastian Drge.
      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 (at) redhat.com>
     22  *          John McCutchan <john (at) johnmccutchan.com>
     23  *          Sebastian Drge <slomo (at) circular-chaos.org>
     24  */
     25 
     26 #include "config.h"
     27 
     28 #include "ginotifydirectorymonitor.h"
     29 #include "giomodule.h"
     30 
     31 #define USE_INOTIFY 1
     32 #include "inotify-helper.h"
     33 
     34 #include "gioalias.h"
     35 
     36 struct _GInotifyDirectoryMonitor
     37 {
     38   GLocalDirectoryMonitor parent_instance;
     39   inotify_sub *sub;
     40 };
     41 
     42 static gboolean g_inotify_directory_monitor_cancel (GFileMonitor* monitor);
     43 
     44 #define g_inotify_directory_monitor_get_type _g_inotify_directory_monitor_get_type
     45 G_DEFINE_TYPE_WITH_CODE (GInotifyDirectoryMonitor, g_inotify_directory_monitor, G_TYPE_LOCAL_DIRECTORY_MONITOR,
     46 			 g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
     47 							 g_define_type_id,
     48 							 "inotify",
     49 							 20))
     50 
     51 static void
     52 g_inotify_directory_monitor_finalize (GObject *object)
     53 {
     54   GInotifyDirectoryMonitor *inotify_monitor = G_INOTIFY_DIRECTORY_MONITOR (object);
     55   inotify_sub *sub = inotify_monitor->sub;
     56 
     57   if (sub)
     58     {
     59       _ih_sub_cancel (sub);
     60       _ih_sub_free (sub);
     61       inotify_monitor->sub = NULL;
     62     }
     63 
     64   if (G_OBJECT_CLASS (g_inotify_directory_monitor_parent_class)->finalize)
     65     (*G_OBJECT_CLASS (g_inotify_directory_monitor_parent_class)->finalize) (object);
     66 }
     67 
     68 static GObject *
     69 g_inotify_directory_monitor_constructor (GType type,
     70 					 guint n_construct_properties,
     71 					 GObjectConstructParam *construct_properties)
     72 {
     73   GObject *obj;
     74   GInotifyDirectoryMonitorClass *klass;
     75   GObjectClass *parent_class;
     76   GInotifyDirectoryMonitor *inotify_monitor;
     77   const gchar *dirname = NULL;
     78   inotify_sub *sub = NULL;
     79 
     80   klass = G_INOTIFY_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_INOTIFY_DIRECTORY_MONITOR));
     81   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
     82   obj = parent_class->constructor (type,
     83                                    n_construct_properties,
     84                                    construct_properties);
     85 
     86   inotify_monitor = G_INOTIFY_DIRECTORY_MONITOR (obj);
     87 
     88   dirname = G_LOCAL_DIRECTORY_MONITOR (obj)->dirname;
     89   g_assert (dirname != NULL);
     90 
     91   /* Will never fail as is_supported() should be called before instanciating
     92    * anyway */
     93   g_assert (_ih_startup ());
     94 
     95   sub = _ih_sub_new (dirname, NULL, inotify_monitor);
     96   /* FIXME: what to do about errors here? we can't return NULL or another
     97    * kind of error and an assertion is probably too hard */
     98   g_assert (sub != NULL);
     99   g_assert (_ih_sub_add (sub));
    100 
    101   inotify_monitor->sub = sub;
    102 
    103   return obj;
    104 }
    105 
    106 static gboolean
    107 g_inotify_directory_monitor_is_supported (void)
    108 {
    109   return _ih_startup ();
    110 }
    111 
    112 static void
    113 g_inotify_directory_monitor_class_init (GInotifyDirectoryMonitorClass* klass)
    114 {
    115   GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
    116   GFileMonitorClass *directory_monitor_class = G_FILE_MONITOR_CLASS (klass);
    117   GLocalDirectoryMonitorClass *local_directory_monitor_class = G_LOCAL_DIRECTORY_MONITOR_CLASS (klass);
    118 
    119   gobject_class->finalize = g_inotify_directory_monitor_finalize;
    120   gobject_class->constructor = g_inotify_directory_monitor_constructor;
    121   directory_monitor_class->cancel = g_inotify_directory_monitor_cancel;
    122 
    123   local_directory_monitor_class->mount_notify = TRUE;
    124   local_directory_monitor_class->is_supported = g_inotify_directory_monitor_is_supported;
    125 }
    126 
    127 static void
    128 g_inotify_directory_monitor_init (GInotifyDirectoryMonitor* monitor)
    129 {
    130 }
    131 
    132 static gboolean
    133 g_inotify_directory_monitor_cancel (GFileMonitor* monitor)
    134 {
    135   GInotifyDirectoryMonitor *inotify_monitor = G_INOTIFY_DIRECTORY_MONITOR (monitor);
    136   inotify_sub *sub = inotify_monitor->sub;
    137 
    138   if (sub)
    139     {
    140       _ih_sub_cancel (sub);
    141       _ih_sub_free (sub);
    142       inotify_monitor->sub = NULL;
    143     }
    144 
    145   if (G_FILE_MONITOR_CLASS (g_inotify_directory_monitor_parent_class)->cancel)
    146     (*G_FILE_MONITOR_CLASS (g_inotify_directory_monitor_parent_class)->cancel) (monitor);
    147 
    148   return TRUE;
    149 }
    150 
    151