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247 lines
8.4 KiB
C
247 lines
8.4 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Vlad Grecescu <b100dian@gmail.com>
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*
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*/
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#include "config.h"
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#include "gwin32directorymonitor.h"
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#include <windows.h>
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G_DEFINE_TYPE_WITH_CODE (GWin32DirectoryMonitor,
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g_win32_directory_monitor,
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G_TYPE_LOCAL_DIRECTORY_MONITOR,
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g_io_extension_point_implement (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME,
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g_define_type_id,
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"readdirectorychanges",
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20))
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struct _GWin32DirectoryMonitorPrivate {
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OVERLAPPED overlapped;
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DWORD buffer_allocated_bytes;
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gchar *file_notify_buffer;
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DWORD buffer_filled_bytes;
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HANDLE hDirectory;
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/* Needed in the APC where we only have this private struct */
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GFileMonitor *self;
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};
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static void g_win32_directory_monitor_finalize (GObject *base);
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static gboolean g_win32_directory_monitor_cancel (GFileMonitor *base);
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static GObject *g_win32_directory_monitor_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_properties);
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static gboolean
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g_win32_directory_monitor_is_supported (void)
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{
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return TRUE;
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}
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static void
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g_win32_directory_monitor_finalize (GObject *base)
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{
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GWin32DirectoryMonitor *self;
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self = G_WIN32_DIRECTORY_MONITOR (base);
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if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
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{
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/* If we don't have a directory handle we can free
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* self->priv->file_notify_buffer and self->priv here. The
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* callback won't be called obviously any more (and presumably
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* never has been called).
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*/
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g_free (self->priv->file_notify_buffer);
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self->priv->file_notify_buffer = NULL;
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g_free (self->priv);
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}
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else
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{
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/* If we have a directory handle, the OVERLAPPED struct is
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* passed once more to the callback as a result of the
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* CloseHandle() done in the cancel method, so self->priv has to
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* be kept around. The GWin32DirectoryMonitor object is
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* disappearing, so can't leave a pointer to it in
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* self->priv->self.
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*/
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self->priv->self = NULL;
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}
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if (G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize)
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(*G_OBJECT_CLASS (g_win32_directory_monitor_parent_class)->finalize) (base);
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}
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static gboolean
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g_win32_directory_monitor_cancel (GFileMonitor *base)
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{
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GWin32DirectoryMonitor *self;
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self = G_WIN32_DIRECTORY_MONITOR (base);
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/* This triggers a last callback() with nBytes==0. */
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/* Actually I am not so sure about that, it seems to trigger a last
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* callback allright, but the way to recognize that it is the final
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* one is not to check for nBytes==0, I think that was a
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* misunderstanding.
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*/
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if (self->priv->hDirectory != INVALID_HANDLE_VALUE)
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CloseHandle (self->priv->hDirectory);
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if (G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel)
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(*G_FILE_MONITOR_CLASS (g_win32_directory_monitor_parent_class)->cancel) (base);
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return TRUE;
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}
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static void CALLBACK
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g_win32_directory_monitor_callback (DWORD error,
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DWORD nBytes,
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LPOVERLAPPED lpOverlapped)
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{
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gulong offset;
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PFILE_NOTIFY_INFORMATION pfile_notify_walker;
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glong file_name_len;
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gchar *file_name;
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gchar *path;
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GFile *file;
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GWin32DirectoryMonitorPrivate *priv = (GWin32DirectoryMonitorPrivate *) lpOverlapped;
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static GFileMonitorEvent events[] =
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{
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0,
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G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_ADDED */
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G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_REMOVED */
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G_FILE_MONITOR_EVENT_CHANGED, /* FILE_ACTION_MODIFIED */
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G_FILE_MONITOR_EVENT_DELETED, /* FILE_ACTION_RENAMED_OLD_NAME */
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G_FILE_MONITOR_EVENT_CREATED, /* FILE_ACTION_RENAMED_NEW_NAME */
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};
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/* If priv->self is NULL the GWin32DirectoryMonitor object has been destroyed. */
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if (priv->self == NULL ||
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g_file_monitor_is_cancelled (priv->self) ||
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priv->file_notify_buffer == NULL)
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{
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g_free (priv->file_notify_buffer);
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g_free (priv);
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return;
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}
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offset = 0;
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do {
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pfile_notify_walker = (PFILE_NOTIFY_INFORMATION)(priv->file_notify_buffer + offset);
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if (pfile_notify_walker->Action > 0)
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{
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file_name = g_utf16_to_utf8 (pfile_notify_walker->FileName, pfile_notify_walker->FileNameLength / sizeof(WCHAR), NULL, &file_name_len, NULL);
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path = g_build_filename(G_LOCAL_DIRECTORY_MONITOR (priv->self)->dirname, file_name, NULL);
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file = g_file_new_for_path (path);
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g_file_monitor_emit_event (priv->self, file, NULL, events [pfile_notify_walker->Action]);
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g_object_unref (file);
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g_free (path);
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g_free (file_name);
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}
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offset += pfile_notify_walker->NextEntryOffset;
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} while (pfile_notify_walker->NextEntryOffset);
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ReadDirectoryChangesW (priv->hDirectory,
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(gpointer)priv->file_notify_buffer,
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priv->buffer_allocated_bytes,
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FALSE,
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FILE_NOTIFY_CHANGE_FILE_NAME |
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FILE_NOTIFY_CHANGE_DIR_NAME |
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FILE_NOTIFY_CHANGE_ATTRIBUTES |
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FILE_NOTIFY_CHANGE_SIZE,
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&priv->buffer_filled_bytes,
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&priv->overlapped,
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g_win32_directory_monitor_callback);
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}
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static GObject *
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g_win32_directory_monitor_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_properties) {
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GObject *obj;
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GWin32DirectoryMonitorClass *klass;
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GObjectClass *parent_class;
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GWin32DirectoryMonitor *self;
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wchar_t *wdirname;
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klass = G_WIN32_DIRECTORY_MONITOR_CLASS (g_type_class_peek (G_TYPE_WIN32_DIRECTORY_MONITOR));
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parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
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obj = parent_class->constructor (type, n_construct_properties, construct_properties);
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self = G_WIN32_DIRECTORY_MONITOR (obj);
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wdirname = g_utf8_to_utf16 (G_LOCAL_DIRECTORY_MONITOR (obj)->dirname, -1, NULL, NULL, NULL);
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self->priv->hDirectory = CreateFileW (wdirname,
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FILE_LIST_DIRECTORY,
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FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
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NULL);
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g_free (wdirname);
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if (self->priv->hDirectory == INVALID_HANDLE_VALUE)
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{
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/* Ignore errors */
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return obj;
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}
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ReadDirectoryChangesW (self->priv->hDirectory,
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(gpointer)self->priv->file_notify_buffer,
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self->priv->buffer_allocated_bytes,
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FALSE,
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FILE_NOTIFY_CHANGE_FILE_NAME |
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FILE_NOTIFY_CHANGE_DIR_NAME |
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FILE_NOTIFY_CHANGE_ATTRIBUTES |
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FILE_NOTIFY_CHANGE_SIZE,
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&self->priv->buffer_filled_bytes,
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&self->priv->overlapped,
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g_win32_directory_monitor_callback);
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/* Ignore errors */
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return obj;
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}
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static void
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g_win32_directory_monitor_class_init (GWin32DirectoryMonitorClass *klass)
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{
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g_win32_directory_monitor_parent_class = g_type_class_peek_parent (klass);
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G_OBJECT_CLASS (klass)->constructor = g_win32_directory_monitor_constructor;
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G_OBJECT_CLASS (klass)->finalize = g_win32_directory_monitor_finalize;
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G_FILE_MONITOR_CLASS (klass)->cancel = g_win32_directory_monitor_cancel;
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G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->mount_notify = FALSE;
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G_LOCAL_DIRECTORY_MONITOR_CLASS (klass)->is_supported = g_win32_directory_monitor_is_supported;
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}
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static void
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g_win32_directory_monitor_init (GWin32DirectoryMonitor *self)
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{
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self->priv = (GWin32DirectoryMonitorPrivate*)g_new0 (GWin32DirectoryMonitorPrivate, 1);
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g_assert (self->priv != 0);
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self->priv->buffer_allocated_bytes = 32768;
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self->priv->file_notify_buffer = g_new0 (gchar, self->priv->buffer_allocated_bytes);
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g_assert (self->priv->file_notify_buffer);
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self->priv->self = G_FILE_MONITOR (self);
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}
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