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 #include "config.h"
  25 #include "gwin32directorymonitor.h"
  26 #include "giomodule.h"
  27 #include <windows.h>
  28
  29 G_DEFINE_TYPE_WITH_CODE (GWin32DirectoryMonitor, g_win32_directory_monitor, G_TYPE_LOCAL_DIRECTORY_MONITOR,
  30 g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
  31                                                          g_define_type_id,
  32                                                          "readdirectorychanges",
  33                                                          20))
  34
  35 struct _GWin32DirectoryMonitorPrivate {
  36         OVERLAPPED overlapped;
  37         DWORD buffer_allocated_bytes;
  38         gchar* file_notify_buffer;
  39         DWORD buffer_filled_bytes;
  40         HANDLE hDirectory;
  41         /** needed in the APC where we only have this private struct */
  42         GFileMonitor * self;
  43 };
  44
  45 static void g_win32_directory_monitor_finalize (GObject* base);
  46 static gboolean g_win32_directory_monitor_cancel (GFileMonitor* base);
  47 static GObject * g_win32_directory_monitor_constructor (GType type, guint n_construct_properties, GObjectConstructParam * construct_properties);
  48
  49 static gboolean g_win32_directory_monitor_is_supported(void) {
  50         return TRUE;
  51 }
  52
  53 static void g_win32_directory_monitor_finalize (GObject* base) {
  54         GWin32DirectoryMonitor * self;
  55         self = G_WIN32_DIRECTORY_MONITOR (base);
  56
  57         g_free (self->priv->file_notify_buffer);
  58         g_free (self->priv);
  59
  60         if (G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize)
  61                 (*G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize) (base);
  62 }
  63
  64
  65 static gboolean g_win32_directory_monitor_cancel (GFileMonitor* base) {
  66         GWin32DirectoryMonitor * self;
  67         self = G_WIN32_DIRECTORY_MONITOR (base);
  68
  69         /* this triggers a last callback() with nBytes=0 */
  70         CloseHandle (self->priv->hDirectory);
  71
  72         if (G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel)
  73         (*G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel) (base);
  74         return TRUE;
  75 }
  76
  77 void CALLBACK g_win32_directory_monitor_callback (DWORD error, DWORD nBytes, GWin32DirectoryMonitorPrivate* lpOverlapped)
  78 {
  79         gulong offset;
  80         PFILE_NOTIFY_INFORMATION pfile_notify_walker;
  81         gulong file_name_len;
  82         gchar* file_name;
  83         GFile * file;
  84
  85         static GFileMonitorEvent events[] = {0,
  86                 G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_ADDED            */
  87                 G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_REMOVED          */
  88                 G_FILE_MONITOR_EVENT_CHANGED, /* FILE_ACTION_MODIFIED         */
  89                 G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_RENAMED_OLD_NAME */
  90                 G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_RENAMED_NEW_NAME */
  91         };
  92
  93         if (!nBytes) /* monitor was cancelled/finalized */
  94                 return;
  95
  96         if (g_file_monitor_is_cancelled (G_FILE_MONITOR (lpOverlapped->self)))
  97                 return; /* and ReadDirectoryChangesW doesn't get called this time */
  98
  99         offset = 0;
 100         do {
 101                 pfile_notify_walker = (PFILE_NOTIFY_INFORMATION)(lpOverlapped->file_notify_buffer + offset);
 102                 offset += pfile_notify_walker->NextEntryOffset;
 103                 file_name = g_utf16_to_utf8 (pfile_notify_walker->FileName, pfile_notify_walker->FileNameLength / sizeof(WCHAR), NULL, &file_name_len, NULL);
 104                 file = g_file_new_for_path (file_name);
 105                 g_file_monitor_emit_event (lpOverlapped->self, file, NULL, events [pfile_notify_walker->Action]);
 106                 g_object_unref (file);
 107                 g_free (file_name);
 108         } while (pfile_notify_walker->NextEntryOffset);
 109
 110         ReadDirectoryChangesW (lpOverlapped->hDirectory, (gpointer)lpOverlapped->file_notify_buffer, lpOverlapped->buffer_allocated_bytes, FALSE,
 111                 FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES |
 112                 FILE_NOTIFY_CHANGE_SIZE, &lpOverlapped->buffer_filled_bytes, &lpOverlapped->overlapped, g_win32_directory_monitor_callback);
 113 }
 114
 115 static GObject * g_win32_directory_monitor_constructor (GType type, guint n_construct_properties, GObjectConstructParam * construct_properties) {
 116         GObject * obj;
 117         GWin32DirectoryMonitorClass * klass;
 118         GObjectClass * parent_class;
 119         GWin32DirectoryMonitor * self;
 120         gchar * dirname;
 121         gboolean result;
 122
 123         klass = G_WIN32_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_WIN32_DIRECTORY_MONITOR));
 124         parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
 125         obj = parent_class->constructor (type, n_construct_properties, construct_properties);
 126         self = G_WIN32_DIRECTORY_MONITOR (obj);
 127         dirname = G_LOCAL_DIRECTORY_MONITOR (obj)->dirname;
 128
 129         self->priv->hDirectory = CreateFile (dirname, FILE_LIST_DIRECTORY, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
 130                 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
 131         g_assert (self->priv->hDirectory != INVALID_HANDLE_VALUE); /* harsh */
 132
 133         result = ReadDirectoryChangesW (self->priv->hDirectory, (gpointer)self->priv->file_notify_buffer, self->priv->buffer_allocated_bytes, FALSE,
 134                 FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES |
 135                 FILE_NOTIFY_CHANGE_SIZE, &self->priv->buffer_filled_bytes, &self->priv->overlapped, g_win32_directory_monitor_callback);
 136         g_assert (result); /* harsh */
 137
 138         return obj;
 139 }
 140
 141 static void g_win32_directory_monitor_class_init (GWin32DirectoryMonitorClass * klass) {
 142
 143         g_win32_directory_monitor_parent_class = g_type_class_peek_parent (klass);
 144
 145         G_OBJECT_CLASS (klass)->constructor = g_win32_directory_monitor_constructor;
 146         G_OBJECT_CLASS (klass)->finalize = g_win32_directory_monitor_finalize;
 147         G_FILE_MONITOR_CLASS (klass)->cancel = g_win32_directory_monitor_cancel;
 148
 149         G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->mount_notify = FALSE;
 150         G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->is_supported = g_win32_directory_monitor_is_supported;
 151 }
 152
 153 static void g_win32_directory_monitor_init (GWin32DirectoryMonitor * self)
 154 {
 155         self->priv = (GWin32DirectoryMonitorPrivate*)g_new0 (GWin32DirectoryMonitorPrivate, 1);
 156         g_assert (self->priv != 0);
 157
 158         self->priv->buffer_allocated_bytes = 32768;
 159         self->priv->file_notify_buffer = g_new0 (gchar, self->priv->buffer_allocated_bytes);
 160         g_assert (self->priv->file_notify_buffer);
 161
 162         self->priv->self = G_FILE_MONITOR (self);
 163 }