gio/win32/gwin32directorymonitor.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: Vlad Grecescu <b100dian@gmail.com>
  21  *
  22  */
  23
  24 #define _WIN32_WINNT 0x0400
  25
  26 #include "config.h"
  27 #include "gwin32directorymonitor.h"
  28 #include "giomodule.h"
  29 #include <windows.h>
  30
  31 G_DEFINE_TYPE_WITH_CODE (GWin32DirectoryMonitor,
  32                          g_win32_directory_monitor,
  33                          G_TYPE_LOCAL_DIRECTORY_MONITOR,
  34                          g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
  35                                                          g_define_type_id,
  36                                                          "readdirectorychanges",
  37                                                          20))
  38
  39 struct _GWin32DirectoryMonitorPrivate {
  40   OVERLAPPED overlapped;
  41   DWORD buffer_allocated_bytes;
  42   gchar *file_notify_buffer;
  43   DWORD buffer_filled_bytes;
  44   HANDLE hDirectory;
  45   /* Needed in the APC where we only have this private struct */
  46   GFileMonitor *self;
  47 };
  48
  49 static void g_win32_directory_monitor_finalize (GObject *base);
  50 static gboolean g_win32_directory_monitor_cancel (GFileMonitor *base);
  51
  52 static GObject *g_win32_directory_monitor_constructor (GType                  type,
  53                                                        guint                  n_construct_properties,
  54                                                        GObjectConstructParam *construct_properties);
  55
  56 static gboolean
  57 g_win32_directory_monitor_is_supported (void)
  58 {
  59   return TRUE;
  60 }
  61
  62 static void
  63 g_win32_directory_monitor_finalize (GObject *base)
  64 {
  65   GWin32DirectoryMonitor *self;
  66   self = G_WIN32_DIRECTORY_MONITOR (base);
  67
  68   g_free (self->priv->file_notify_buffer);
  69   g_free (self->priv);
  70
  71   if (G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize)
  72     (*G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize) (base);
  73 }
  74
  75 static gboolean
  76 g_win32_directory_monitor_cancel (GFileMonitor *base)
  77 {
  78   GWin32DirectoryMonitor *self;
  79   self = G_WIN32_DIRECTORY_MONITOR (base);
  80
  81   /* This triggers a last callback() with nBytes=0 */
  82   if (self->priv->hDirectory != INVALID_HANDLE_VALUE)
  83     CloseHandle (self->priv->hDirectory);
  84
  85   if (G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel)
  86     (*G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel) (base);
  87   return TRUE;
  88 }
  89
  90 static void CALLBACK
  91 g_win32_directory_monitor_callback (DWORD        error,
  92                                     DWORD        nBytes,
  93                                     LPOVERLAPPED lpOverlapped)
  94 {
  95   gulong offset;
  96   PFILE_NOTIFY_INFORMATION pfile_notify_walker;
  97   gulong file_name_len;
  98   gchar *file_name;
  99   GFile *file;
 100   GWin32DirectoryMonitorPrivate *priv = (GWin32DirectoryMonitorPrivate *) lpOverlapped;
 101
 102   static GFileMonitorEvent events[] =
 103     {
 104       0,
 105       G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_ADDED            */
 106       G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_REMOVED          */
 107       G_FILE_MONITOR_EVENT_CHANGED, /* FILE_ACTION_MODIFIED         */
 108       G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_RENAMED_OLD_NAME */
 109       G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_RENAMED_NEW_NAME */
 110     };
 111
 112   if (!nBytes) /* Monitor was cancelled/finalized */
 113     return;
 114
 115   if (g_file_monitor_is_cancelled (G_FILE_MONITOR (priv->self)))
 116     return; /* and ReadDirectoryChangesW doesn't get called this time */
 117
 118   offset = 0;
 119   do {
 120     pfile_notify_walker = (PFILE_NOTIFY_INFORMATION)(priv->file_notify_buffer + offset);
 121     offset += pfile_notify_walker->NextEntryOffset;
 122     file_name = g_utf16_to_utf8 (pfile_notify_walker->FileName, pfile_notify_walker->FileNameLength / sizeof(WCHAR), NULL, &file_name_len, NULL);
 123     file = g_file_new_for_path (file_name);
 124     g_file_monitor_emit_event (priv->self, file, NULL, events [pfile_notify_walker->Action]);
 125     g_object_unref (file);
 126     g_free (file_name);
 127   } while (pfile_notify_walker->NextEntryOffset);
 128
 129   ReadDirectoryChangesW (priv->hDirectory,
 130                          (gpointer)priv->file_notify_buffer,
 131                          priv->buffer_allocated_bytes,
 132                          FALSE,
 133                          FILE_NOTIFY_CHANGE_FILE_NAME |
 134                          FILE_NOTIFY_CHANGE_DIR_NAME |
 135                          FILE_NOTIFY_CHANGE_ATTRIBUTES |
 136                          FILE_NOTIFY_CHANGE_SIZE,
 137                          &priv->buffer_filled_bytes,
 138                          &priv->overlapped,
 139                          g_win32_directory_monitor_callback);
 140 }
 141
 142 static GObject *
 143 g_win32_directory_monitor_constructor (GType                  type,
 144                                        guint                  n_construct_properties,
 145                                        GObjectConstructParam *construct_properties) {
 146   GObject *obj;
 147   GWin32DirectoryMonitorClass *klass;
 148   GObjectClass *parent_class;
 149   GWin32DirectoryMonitor *self;
 150   wchar_t *wdirname;
 151   gboolean result;
 152
 153   klass = G_WIN32_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_WIN32_DIRECTORY_MONITOR));
 154   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
 155   obj = parent_class->constructor (type, n_construct_properties, construct_properties);
 156   self = G_WIN32_DIRECTORY_MONITOR (obj);
 157   wdirname = g_utf8_to_utf16 (G_LOCAL_DIRECTORY_MONITOR (obj)->dirname, -1, NULL, NULL, NULL);
 158
 159   self->priv->hDirectory = CreateFileW (wdirname,
 160                                         FILE_LIST_DIRECTORY,
 161                                         FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
 162
 163                                         NULL,
 164                                         OPEN_EXISTING,
 165                                         FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
 166                                         NULL);
 167   g_free (wdirname);
 168   if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
 169     {
 170       /* Ignore errors */
 171       return obj;
 172     }
 173
 174   result = ReadDirectoryChangesW (self->priv->hDirectory,
 175                                   (gpointer)self->priv->file_notify_buffer,
 176                                   self->priv->buffer_allocated_bytes,
 177                                   FALSE,
 178                                   FILE_NOTIFY_CHANGE_FILE_NAME |
 179                                   FILE_NOTIFY_CHANGE_DIR_NAME |
 180                                   FILE_NOTIFY_CHANGE_ATTRIBUTES |
 181                                   FILE_NOTIFY_CHANGE_SIZE,
 182                                   &self->priv->buffer_filled_bytes,
 183                                   &self->priv->overlapped,
 184                                   g_win32_directory_monitor_callback);
 185   /* Ignore errors */
 186
 187   return obj;
 188 }
 189
 190 static void
 191 g_win32_directory_monitor_class_init (GWin32DirectoryMonitorClass *klass)
 192 {
 193   g_win32_directory_monitor_parent_class = g_type_class_peek_parent (klass);
 194
 195   G_OBJECT_CLASS (klass)->constructor = g_win32_directory_monitor_constructor;
 196   G_OBJECT_CLASS (klass)->finalize = g_win32_directory_monitor_finalize;
 197   G_FILE_MONITOR_CLASS (klass)->cancel = g_win32_directory_monitor_cancel;
 198
 199   G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->mount_notify = FALSE;
 200   G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->is_supported = g_win32_directory_monitor_is_supported;
 201 }
 202
 203 static void
 204 g_win32_directory_monitor_init (GWin32DirectoryMonitor *self)
 205 {
 206   self->priv = (GWin32DirectoryMonitorPrivate*)g_new0 (GWin32DirectoryMonitorPrivate, 1);
 207   g_assert (self->priv != 0);
 208
 209   self->priv->buffer_allocated_bytes = 32768;
 210   self->priv->file_notify_buffer = g_new0 (gchar, self->priv->buffer_allocated_bytes);
 211   g_assert (self->priv->file_notify_buffer);
 212
 213   self->priv->self = G_FILE_MONITOR (self);
 214 }