1 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */
2
3 /* inotify-helper.c - GVFS Monitor based on inotify.
4
5 Copyright (C) 2007 John McCutchan
6
7 The Gnome Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
11
12 The Gnome Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public
18 License along with the Gnome Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA.
21
22 Authors:
23 John McCutchan <john@johnmccutchan.com>
24 */
25
26 #include "config.h"
27 #include <errno.h>
28 #include <time.h>
29 #include <string.h>
30 #include <sys/ioctl.h>
31 /* Just include the local header to stop all the pain */
32 #include <sys/inotify.h>
33 #include <gio/glocalfile.h>
34 #include <gio/gfilemonitor.h>
35 #include <gio/gfile.h>
36 #include "inotify-helper.h"
37 #include "inotify-missing.h"
38 #include "inotify-path.h"
39 #include "inotify-diag.h"
40
41 #include "gioalias.h"
42
43
44 static gboolean ih_debug_enabled = FALSE;
45 #define IH_W if (ih_debug_enabled) g_warning
46
47 static void ih_event_callback (ik_event_t *event, inotify_sub *sub);
48 static void ih_not_missing_callback (inotify_sub *sub);
49
50 /* We share this lock with inotify-kernel.c and inotify-missing.c
51 *
52 * inotify-kernel.c takes the lock when it reads events from
53 * the kernel and when it processes those events
54 *
55 * inotify-missing.c takes the lock when it is scanning the missing
56 * list.
57 *
58 * We take the lock in all public functions
59 */
60 G_GNUC_INTERNAL G_LOCK_DEFINE (inotify_lock);
61
62 static GFileMonitorEvent ih_mask_to_EventFlags (guint32 mask);
63
64 /**
65 * _ih_startup:
66 *
67 * Initializes the inotify backend. This must be called before
68 * any other functions in this module.
69 *
70 * Return value: #TRUE if initialization succeeded, #FALSE otherwise
71 */
72 gboolean
_ih_startup(void)73 _ih_startup (void)
74 {
75 static gboolean initialized = FALSE;
76 static gboolean result = FALSE;
77
78 G_LOCK (inotify_lock);
79
80 if (initialized == TRUE)
81 {
82 G_UNLOCK (inotify_lock);
83 return result;
84 }
85
86 result = _ip_startup (ih_event_callback);
87 if (!result)
88 {
89 g_warning ("Could not initialize inotify\n");
90 G_UNLOCK (inotify_lock);
91 return FALSE;
92 }
93 _im_startup (ih_not_missing_callback);
94 _id_startup ();
95
96 IH_W ("started gvfs inotify backend\n");
97
98 initialized = TRUE;
99
100 G_UNLOCK (inotify_lock);
101
102 return TRUE;
103 }
104
105 /**
106 * Adds a subscription to be monitored.
107 */
108 gboolean
_ih_sub_add(inotify_sub * sub)109 _ih_sub_add (inotify_sub *sub)
110 {
111 G_LOCK (inotify_lock);
112
113 if (!_ip_start_watching (sub))
114 _im_add (sub);
115
116 G_UNLOCK (inotify_lock);
117 return TRUE;
118 }
119
120 /**
121 * Cancels a subscription which was being monitored.
122 */
123 gboolean
_ih_sub_cancel(inotify_sub * sub)124 _ih_sub_cancel (inotify_sub *sub)
125 {
126 G_LOCK (inotify_lock);
127
128 if (!sub->cancelled)
129 {
130 IH_W ("cancelling %s\n", sub->dirname);
131 sub->cancelled = TRUE;
132 _im_rm (sub);
133 _ip_stop_watching (sub);
134 }
135
136 G_UNLOCK (inotify_lock);
137
138 return TRUE;
139 }
140
141
142 static void
ih_event_callback(ik_event_t * event,inotify_sub * sub)143 ih_event_callback (ik_event_t *event,
144 inotify_sub *sub)
145 {
146 gchar *fullpath;
147 GFileMonitorEvent eflags;
148 GFile* parent;
149 GFile* child;
150
151 eflags = ih_mask_to_EventFlags (event->mask);
152 parent = g_file_new_for_path (sub->dirname);
153 if (event->name)
154 fullpath = g_strdup_printf ("%s/%s", sub->dirname, event->name);
155 else
156 fullpath = g_strdup_printf ("%s/", sub->dirname);
157
158 child = g_file_new_for_path (fullpath);
159 g_free (fullpath);
160
161 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
162 child, NULL, eflags);
163
164 g_object_unref (child);
165 g_object_unref (parent);
166 }
167
168 static void
ih_not_missing_callback(inotify_sub * sub)169 ih_not_missing_callback (inotify_sub *sub)
170 {
171 gchar *fullpath;
172 GFileMonitorEvent eflags;
173 guint32 mask;
174 GFile* parent;
175 GFile* child;
176
177 parent = g_file_new_for_path (sub->dirname);
178
179 if (sub->filename)
180 {
181 fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename);
182 g_warning ("Missing callback called fullpath = %s\n", fullpath);
183 if (!g_file_test (fullpath, G_FILE_TEST_EXISTS))
184 {
185 g_free (fullpath);
186 return;
187 }
188 mask = IN_CREATE;
189 }
190 else
191 {
192 fullpath = g_strdup_printf ("%s", sub->dirname);
193 mask = IN_CREATE|IN_ISDIR;
194 }
195
196 eflags = ih_mask_to_EventFlags (mask);
197 child = g_file_new_for_path (fullpath);
198 g_free (fullpath);
199
200 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
201 child, NULL, eflags);
202
203 g_object_unref (child);
204 g_object_unref (parent);
205 }
206
207 /* Transforms a inotify event to a GVFS event. */
208 static GFileMonitorEvent
ih_mask_to_EventFlags(guint32 mask)209 ih_mask_to_EventFlags (guint32 mask)
210 {
211 mask &= ~IN_ISDIR;
212 switch (mask)
213 {
214 case IN_MODIFY:
215 return G_FILE_MONITOR_EVENT_CHANGED;
216 case IN_CLOSE_WRITE:
217 return G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT;
218 case IN_ATTRIB:
219 return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED;
220 case IN_MOVE_SELF:
221 case IN_MOVED_FROM:
222 case IN_DELETE:
223 case IN_DELETE_SELF:
224 return G_FILE_MONITOR_EVENT_DELETED;
225 case IN_CREATE:
226 case IN_MOVED_TO:
227 return G_FILE_MONITOR_EVENT_CREATED;
228 case IN_UNMOUNT:
229 return G_FILE_MONITOR_EVENT_UNMOUNTED;
230 case IN_Q_OVERFLOW:
231 case IN_OPEN:
232 case IN_CLOSE_NOWRITE:
233 case IN_ACCESS:
234 case IN_IGNORED:
235 default:
236 return -1;
237 }
238 }
239