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 2.1 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, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Alexander Larsson <alexl@redhat.com>
19 */
20
21#include "config.h"
22#include <string.h>
23
24#include "gpollfilemonitor.h"
25#include "gfile.h"
26#include "gfilemonitor.h"
27#include "gfileinfo.h"
28
29
30static gboolean g_poll_file_monitor_cancel (GFileMonitor* monitor);
31static void schedule_poll_timeout (GPollFileMonitor* poll_monitor);
32
33struct _GPollFileMonitor
34{
35 GFileMonitor parent_instance;
36 GFile *file;
37 GFileInfo *last_info;
38 GSource *timeout;
39};
40
41#define POLL_TIME_SECS 5
42
43#define g_poll_file_monitor_get_type _g_poll_file_monitor_get_type
44G_DEFINE_TYPE (GPollFileMonitor, g_poll_file_monitor, G_TYPE_FILE_MONITOR)
45
46static void
47g_poll_file_monitor_finalize (GObject* object)
48{
49 GPollFileMonitor* poll_monitor;
50
51 poll_monitor = G_POLL_FILE_MONITOR (object);
52
53 g_poll_file_monitor_cancel (G_FILE_MONITOR (poll_monitor));
54 g_object_unref (object: poll_monitor->file);
55 g_clear_object (&poll_monitor->last_info);
56
57 G_OBJECT_CLASS (g_poll_file_monitor_parent_class)->finalize (object);
58}
59
60
61static void
62g_poll_file_monitor_class_init (GPollFileMonitorClass* klass)
63{
64 GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
65 GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
66
67 gobject_class->finalize = g_poll_file_monitor_finalize;
68
69 file_monitor_class->cancel = g_poll_file_monitor_cancel;
70}
71
72static void
73g_poll_file_monitor_init (GPollFileMonitor* poll_monitor)
74{
75}
76
77static int
78calc_event_type (GFileInfo *last,
79 GFileInfo *new)
80{
81 if (last == NULL && new == NULL)
82 return -1;
83
84 if (last == NULL && new != NULL)
85 return G_FILE_MONITOR_EVENT_CREATED;
86
87 if (last != NULL && new == NULL)
88 return G_FILE_MONITOR_EVENT_DELETED;
89
90 if (g_strcmp0 (str1: g_file_info_get_etag (info: last), str2: g_file_info_get_etag (info: new)))
91 return G_FILE_MONITOR_EVENT_CHANGED;
92
93 if (g_file_info_get_size (info: last) != g_file_info_get_size (info: new))
94 return G_FILE_MONITOR_EVENT_CHANGED;
95
96 return -1;
97}
98
99static void
100got_new_info (GObject *source_object,
101 GAsyncResult *res,
102 gpointer user_data)
103{
104 GPollFileMonitor* poll_monitor = user_data;
105 GFileInfo *info;
106 int event;
107
108 info = g_file_query_info_finish (file: poll_monitor->file, res, NULL);
109
110 if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)))
111 {
112 event = calc_event_type (last: poll_monitor->last_info, new: info);
113
114 if (event != -1)
115 {
116 g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor),
117 child: poll_monitor->file,
118 NULL, event_type: event);
119 /* We're polling so slowly anyway, so always emit the done hint */
120 if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)) &&
121 (event == G_FILE_MONITOR_EVENT_CHANGED || event == G_FILE_MONITOR_EVENT_CREATED))
122 g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor),
123 child: poll_monitor->file,
124 NULL, event_type: G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT);
125 }
126
127 if (poll_monitor->last_info)
128 {
129 g_object_unref (object: poll_monitor->last_info);
130 poll_monitor->last_info = NULL;
131 }
132
133 if (info)
134 poll_monitor->last_info = g_object_ref (info);
135
136 schedule_poll_timeout (poll_monitor);
137 }
138
139 if (info)
140 g_object_unref (object: info);
141
142 g_object_unref (object: poll_monitor);
143}
144
145static gboolean
146poll_file_timeout (gpointer data)
147{
148 GPollFileMonitor* poll_monitor = data;
149
150 g_source_unref (source: poll_monitor->timeout);
151 poll_monitor->timeout = NULL;
152
153 g_file_query_info_async (file: poll_monitor->file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE,
154 flags: 0, io_priority: 0, NULL, callback: got_new_info, g_object_ref (poll_monitor));
155
156 return G_SOURCE_REMOVE;
157}
158
159static void
160schedule_poll_timeout (GPollFileMonitor* poll_monitor)
161{
162 poll_monitor->timeout = g_timeout_source_new_seconds (POLL_TIME_SECS);
163 g_source_set_callback (source: poll_monitor->timeout, func: poll_file_timeout, data: poll_monitor, NULL);
164 g_source_attach (source: poll_monitor->timeout, context: g_main_context_get_thread_default ());
165}
166
167static void
168got_initial_info (GObject *source_object,
169 GAsyncResult *res,
170 gpointer user_data)
171{
172 GPollFileMonitor* poll_monitor = user_data;
173 GFileInfo *info;
174
175 info = g_file_query_info_finish (file: poll_monitor->file, res, NULL);
176
177 poll_monitor->last_info = info;
178
179 if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)))
180 schedule_poll_timeout (poll_monitor);
181
182 g_object_unref (object: poll_monitor);
183}
184
185/**
186 * _g_poll_file_monitor_new:
187 * @file: a #GFile.
188 *
189 * Polls @file for changes.
190 *
191 * Returns: a new #GFileMonitor for the given #GFile.
192 **/
193GFileMonitor*
194_g_poll_file_monitor_new (GFile *file)
195{
196 GPollFileMonitor* poll_monitor;
197
198 poll_monitor = g_object_new (G_TYPE_POLL_FILE_MONITOR, NULL);
199
200 poll_monitor->file = g_object_ref (file);
201
202 g_file_query_info_async (file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE,
203 flags: 0, io_priority: 0, NULL, callback: got_initial_info, g_object_ref (poll_monitor));
204
205 return G_FILE_MONITOR (poll_monitor);
206}
207
208static gboolean
209g_poll_file_monitor_cancel (GFileMonitor* monitor)
210{
211 GPollFileMonitor *poll_monitor = G_POLL_FILE_MONITOR (monitor);
212
213 if (poll_monitor->timeout)
214 {
215 g_source_destroy (source: poll_monitor->timeout);
216 g_source_unref (source: poll_monitor->timeout);
217 poll_monitor->timeout = NULL;
218 }
219
220 return TRUE;
221}
222

source code of gtk/subprojects/glib/gio/gpollfilemonitor.c