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, g_win32_directory_monitor, G_TYPE_LOCAL_DIRECTORY_MONITOR,
  32 g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
  33                                                          g_define_type_id,
  34                                                          "readdirectorychanges",
  35                                                          20))
  36
  37 struct _GWin32DirectoryMonitorPrivate {
  38         OVERLAPPED overlapped;
  39         DWORD buffer_allocated_bytes;
  40         gchar* file_notify_buffer;
  41         DWORD buffer_filled_bytes;
  42         HANDLE hDirectory;
  43         /** needed in the APC where we only have this private struct */
  44         GFileMonitor * self;
  45 };
  46
  47 static void g_win32_directory_monitor_finalize (GObject* base);
  48 static gboolean g_win32_directory_monitor_cancel (GFileMonitor* base);
  49 static GObject * g_win32_directory_monitor_constructor (GType type, guint n_construct_properties, GObjectConstructParam * construct_properties);
  50
  51 static gboolean g_win32_directory_monitor_is_supported(void) {
  52         return TRUE;
  53 }
  54
  55 static void g_win32_directory_monitor_finalize (GObject* base) {
  56         GWin32DirectoryMonitor * self;
  57         self = G_WIN32_DIRECTORY_MONITOR (base);
  58
  59         g_free (self->priv->file_notify_buffer);
  60         g_free (self->priv);
  61
  62         if (G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize)
  63                 (*G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize) (base);
  64 }
  65
  66
  67 static gboolean g_win32_directory_monitor_cancel (GFileMonitor* base) {
  68         GWin32DirectoryMonitor * self;
  69         self = G_WIN32_DIRECTORY_MONITOR (base);
  70
  71         /* this triggers a last callback() with nBytes=0 */
  72         if (self->priv->hDirectory != INVALID_HANDLE_VALUE)
  73           CloseHandle (self->priv->hDirectory);
  74
  75         if (G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel)
  76         (*G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel) (base);
  77         return TRUE;
  78 }
  79
  80 void CALLBACK g_win32_directory_monitor_callback (DWORD error, DWORD nBytes, GWin32DirectoryMonitorPrivate* lpOverlapped)
  81 {
  82         gulong offset;
  83         PFILE_NOTIFY_INFORMATION pfile_notify_walker;
  84         gulong file_name_len;
  85         gchar* file_name;
  86         GFile * file;
  87
  88         static GFileMonitorEvent events[] = {0,
  89                 G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_ADDED            */
  90                 G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_REMOVED          */
  91                 G_FILE_MONITOR_EVENT_CHANGED, /* FILE_ACTION_MODIFIED         */
  92                 G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_RENAMED_OLD_NAME */
  93                 G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_RENAMED_NEW_NAME */
  94         };
  95
  96         if (!nBytes) /* monitor was cancelled/finalized */
  97                 return;
  98
  99         if (g_file_monitor_is_cancelled (G_FILE_MONITOR (lpOverlapped->self)))
 100                 return; /* and ReadDirectoryChangesW doesn't get called this time */
 101
 102         offset = 0;
 103         do {
 104                 pfile_notify_walker = (PFILE_NOTIFY_INFORMATION)(lpOverlapped->file_notify_buffer + offset);
 105                 offset += pfile_notify_walker->NextEntryOffset;
 106                 file_name = g_utf16_to_utf8 (pfile_notify_walker->FileName, pfile_notify_walker->FileNameLength / sizeof(WCHAR), NULL, &file_name_len, NULL);
 107                 file = g_file_new_for_path (file_name);
 108                 g_file_monitor_emit_event (lpOverlapped->self, file, NULL, events [pfile_notify_walker->Action]);
 109                 g_object_unref (file);
 110                 g_free (file_name);
 111         } while (pfile_notify_walker->NextEntryOffset);
 112
 113         ReadDirectoryChangesW (lpOverlapped->hDirectory, (gpointer)lpOverlapped->file_notify_buffer, lpOverlapped->buffer_allocated_bytes, FALSE,
 114                 FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES |
 115                 FILE_NOTIFY_CHANGE_SIZE, &lpOverlapped->buffer_filled_bytes, &lpOverlapped->overlapped, g_win32_directory_monitor_callback);
 116 }
 117
 118 static GObject * g_win32_directory_monitor_constructor (GType type, guint n_construct_properties, GObjectConstructParam * construct_properties) {
 119         GObject * obj;
 120         GWin32DirectoryMonitorClass * klass;
 121         GObjectClass * parent_class;
 122         GWin32DirectoryMonitor * self;
 123         gchar * dirname;
 124         gboolean result;
 125
 126         klass = G_WIN32_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_WIN32_DIRECTORY_MONITOR));
 127         parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
 128         obj = parent_class->constructor (type, n_construct_properties, construct_properties);
 129         self = G_WIN32_DIRECTORY_MONITOR (obj);
 130         dirname = G_LOCAL_DIRECTORY_MONITOR (obj)->dirname;
 131
 132         self->priv->hDirectory = CreateFile (dirname, FILE_LIST_DIRECTORY, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
 133                 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
 134         if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
 135           {
 136             /* Ignore errors */
 137             return obj;
 138           }
 139
 140         result = ReadDirectoryChangesW (self->priv->hDirectory, (gpointer)self->priv->file_notify_buffer, self->priv->buffer_allocated_bytes, FALSE,
 141                 FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES |
 142                 FILE_NOTIFY_CHANGE_SIZE, &self->priv->buffer_filled_bytes, &self->priv->overlapped, g_win32_directory_monitor_callback);
 143         /* Ignore errors */
 144
 145         return obj;
 146 }
 147
 148 static void g_win32_directory_monitor_class_init (GWin32DirectoryMonitorClass * klass) {
 149
 150         g_win32_directory_monitor_parent_class = g_type_class_peek_parent (klass);
 151
 152         G_OBJECT_CLASS (klass)->constructor = g_win32_directory_monitor_constructor;
 153         G_OBJECT_CLASS (klass)->finalize = g_win32_directory_monitor_finalize;
 154         G_FILE_MONITOR_CLASS (klass)->cancel = g_win32_directory_monitor_cancel;
 155
 156         G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->mount_notify = FALSE;
 157         G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->is_supported = g_win32_directory_monitor_is_supported;
 158 }
 159
 160 static void g_win32_directory_monitor_init (GWin32DirectoryMonitor * self)
 161 {
 162         self->priv = (GWin32DirectoryMonitorPrivate*)g_new0 (GWin32DirectoryMonitorPrivate, 1);
 163         g_assert (self->priv != 0);
 164
 165         self->priv->buffer_allocated_bytes = 32768;
 166         self->priv->file_notify_buffer = g_new0 (gchar, self->priv->buffer_allocated_bytes);
 167         g_assert (self->priv->file_notify_buffer);
 168
 169         self->priv->self = G_FILE_MONITOR (self);
 170 }