/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see .
*
* Author: Vlad Grecescu
*
*/
#include "config.h"
#include "gwin32directorymonitor.h"
#include
G_DEFINE_TYPE_WITH_CODE (GWin32DirectoryMonitor,
g_win32_directory_monitor,
G_TYPE_LOCAL_DIRECTORY_MONITOR,
g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
g_define_type_id,
"readdirectorychanges",
20))
struct _GWin32DirectoryMonitorPrivate {
OVERLAPPED overlapped;
DWORD buffer_allocated_bytes;
gchar *file_notify_buffer;
DWORD buffer_filled_bytes;
HANDLE hDirectory;
/* Needed in the APC where we only have this private struct */
GFileMonitor *self;
};
static void g_win32_directory_monitor_finalize (GObject *base);
static gboolean g_win32_directory_monitor_cancel (GFileMonitor *base);
static GObject *g_win32_directory_monitor_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties);
static gboolean
g_win32_directory_monitor_is_supported (void)
{
return TRUE;
}
static void
g_win32_directory_monitor_finalize (GObject *base)
{
GWin32DirectoryMonitor *self;
self = G_WIN32_DIRECTORY_MONITOR (base);
if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
{
/* If we don't have a directory handle we can free
* self->priv->file_notify_buffer and self->priv here. The
* callback won't be called obviously any more (and presumably
* never has been called).
*/
g_free (self->priv->file_notify_buffer);
self->priv->file_notify_buffer = NULL;
g_free (self->priv);
}
else
{
/* If we have a directory handle, the OVERLAPPED struct is
* passed once more to the callback as a result of the
* CloseHandle() done in the cancel method, so self->priv has to
* be kept around. The GWin32DirectoryMonitor object is
* disappearing, so can't leave a pointer to it in
* self->priv->self.
*/
self->priv->self = NULL;
}
if (G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize)
(*G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize) (base);
}
static gboolean
g_win32_directory_monitor_cancel (GFileMonitor *base)
{
GWin32DirectoryMonitor *self;
self = G_WIN32_DIRECTORY_MONITOR (base);
/* This triggers a last callback() with nBytes==0. */
/* Actually I am not so sure about that, it seems to trigger a last
* callback allright, but the way to recognize that it is the final
* one is not to check for nBytes==0, I think that was a
* misunderstanding.
*/
if (self->priv->hDirectory != INVALID_HANDLE_VALUE)
CloseHandle (self->priv->hDirectory);
if (G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel)
(*G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel) (base);
return TRUE;
}
static void CALLBACK
g_win32_directory_monitor_callback (DWORD error,
DWORD nBytes,
LPOVERLAPPED lpOverlapped)
{
gulong offset;
PFILE_NOTIFY_INFORMATION pfile_notify_walker;
glong file_name_len;
gchar *file_name;
gchar *path;
GFile *file;
GWin32DirectoryMonitorPrivate *priv = (GWin32DirectoryMonitorPrivate *) lpOverlapped;
static GFileMonitorEvent events[] =
{
0,
G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_ADDED */
G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_REMOVED */
G_FILE_MONITOR_EVENT_CHANGED, /* FILE_ACTION_MODIFIED */
G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_RENAMED_OLD_NAME */
G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_RENAMED_NEW_NAME */
};
/* If priv->self is NULL the GWin32DirectoryMonitor object has been destroyed. */
if (priv->self == NULL ||
g_file_monitor_is_cancelled (priv->self) ||
priv->file_notify_buffer == NULL)
{
g_free (priv->file_notify_buffer);
g_free (priv);
return;
}
offset = 0;
do {
pfile_notify_walker = (PFILE_NOTIFY_INFORMATION)(priv->file_notify_buffer + offset);
if (pfile_notify_walker->Action > 0)
{
file_name = g_utf16_to_utf8 (pfile_notify_walker->FileName, pfile_notify_walker->FileNameLength / sizeof(WCHAR), NULL, &file_name_len, NULL);
path = g_build_filename(G_LOCAL_DIRECTORY_MONITOR (priv->self)->dirname, file_name, NULL);
file = g_file_new_for_path (path);
g_file_monitor_emit_event (priv->self, file, NULL, events [pfile_notify_walker->Action]);
g_object_unref (file);
g_free (path);
g_free (file_name);
}
offset += pfile_notify_walker->NextEntryOffset;
} while (pfile_notify_walker->NextEntryOffset);
ReadDirectoryChangesW (priv->hDirectory,
(gpointer)priv->file_notify_buffer,
priv->buffer_allocated_bytes,
FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_SIZE,
&priv->buffer_filled_bytes,
&priv->overlapped,
g_win32_directory_monitor_callback);
}
static GObject *
g_win32_directory_monitor_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties) {
GObject *obj;
GWin32DirectoryMonitorClass *klass;
GObjectClass *parent_class;
GWin32DirectoryMonitor *self;
wchar_t *wdirname;
klass = G_WIN32_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_WIN32_DIRECTORY_MONITOR));
parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
obj = parent_class->constructor (type, n_construct_properties, construct_properties);
self = G_WIN32_DIRECTORY_MONITOR (obj);
wdirname = g_utf8_to_utf16 (G_LOCAL_DIRECTORY_MONITOR (obj)->dirname, -1, NULL, NULL, NULL);
self->priv->hDirectory = CreateFileW (wdirname,
FILE_LIST_DIRECTORY,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
NULL);
g_free (wdirname);
if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
{
/* Ignore errors */
return obj;
}
ReadDirectoryChangesW (self->priv->hDirectory,
(gpointer)self->priv->file_notify_buffer,
self->priv->buffer_allocated_bytes,
FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_SIZE,
&self->priv->buffer_filled_bytes,
&self->priv->overlapped,
g_win32_directory_monitor_callback);
/* Ignore errors */
return obj;
}
static void
g_win32_directory_monitor_class_init (GWin32DirectoryMonitorClass *klass)
{
g_win32_directory_monitor_parent_class = g_type_class_peek_parent (klass);
G_OBJECT_CLASS (klass)->constructor = g_win32_directory_monitor_constructor;
G_OBJECT_CLASS (klass)->finalize = g_win32_directory_monitor_finalize;
G_FILE_MONITOR_CLASS (klass)->cancel = g_win32_directory_monitor_cancel;
G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->mount_notify = FALSE;
G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->is_supported = g_win32_directory_monitor_is_supported;
}
static void
g_win32_directory_monitor_init (GWin32DirectoryMonitor *self)
{
self->priv = (GWin32DirectoryMonitorPrivate*)g_new0 (GWin32DirectoryMonitorPrivate, 1);
g_assert (self->priv != 0);
self->priv->buffer_allocated_bytes = 32768;
self->priv->file_notify_buffer = g_new0 (gchar, self->priv->buffer_allocated_bytes);
g_assert (self->priv->file_notify_buffer);
self->priv->self = G_FILE_MONITOR (self);
}