1 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */
3 /* inotify-helper.c - GVFS Monitor based on inotify.
5 Copyright (C) 2007 John McCutchan
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.
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.
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.
23 John McCutchan <john@johnmccutchan.com>
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"
40 static gboolean ih_debug_enabled = FALSE;
41 #define IH_W if (ih_debug_enabled) g_warning
43 static void ih_event_callback (ik_event_t *event,
46 static void ih_not_missing_callback (inotify_sub *sub);
48 /* We share this lock with inotify-kernel.c and inotify-missing.c
50 * inotify-kernel.c takes the lock when it reads events from
51 * the kernel and when it processes those events
53 * inotify-missing.c takes the lock when it is scanning the missing
56 * We take the lock in all public functions
58 G_LOCK_DEFINE (inotify_lock);
60 static GFileMonitorEvent ih_mask_to_EventFlags (guint32 mask);
65 * Initializes the inotify backend. This must be called before
66 * any other functions in this module.
68 * Return value: #TRUE if initialization succeeded, #FALSE otherwise
73 static gboolean initialized = FALSE;
74 static gboolean result = FALSE;
76 G_LOCK (inotify_lock);
78 if (initialized == TRUE)
80 G_UNLOCK (inotify_lock);
84 result = _ip_startup (ih_event_callback);
87 G_UNLOCK (inotify_lock);
90 _im_startup (ih_not_missing_callback);
92 IH_W ("started gvfs inotify backend\n");
96 G_UNLOCK (inotify_lock);
102 * Adds a subscription to be monitored.
105 _ih_sub_add (inotify_sub *sub)
107 G_LOCK (inotify_lock);
109 if (!_ip_start_watching (sub))
112 G_UNLOCK (inotify_lock);
117 * Cancels a subscription which was being monitored.
120 _ih_sub_cancel (inotify_sub *sub)
122 G_LOCK (inotify_lock);
126 IH_W ("cancelling %s\n", sub->dirname);
127 sub->cancelled = TRUE;
129 _ip_stop_watching (sub);
132 G_UNLOCK (inotify_lock);
138 _ih_fullpath_from_event (ik_event_t *event,
140 const char *filename)
145 fullpath = g_strdup_printf ("%s/%s", dirname, filename);
146 else if (event->name)
147 fullpath = g_strdup_printf ("%s/%s", dirname, event->name);
149 fullpath = g_strdup_printf ("%s/", dirname);
156 ih_event_is_paired_move (ik_event_t *event)
160 ik_event_t *paired = event->pair;
161 /* intofiy(7): IN_MOVE == IN_MOVED_FROM | IN_MOVED_TO */
162 return (event->mask | paired->mask) & IN_MOVE;
169 ih_event_callback (ik_event_t *event,
174 GFileMonitorEvent eflags;
178 eflags = ih_mask_to_EventFlags (event->mask);
179 fullpath = _ih_fullpath_from_event (event, sub->dirname,
180 file_event ? sub->filename : NULL);
181 child = g_file_new_for_path (fullpath);
184 if (ih_event_is_paired_move (event) && sub->pair_moves)
186 const char *parent_dir = (char *) _ip_get_path_for_wd (event->pair->wd);
187 fullpath = _ih_fullpath_from_event (event->pair, parent_dir, NULL);
188 other = g_file_new_for_path (fullpath);
190 eflags = G_FILE_MONITOR_EVENT_MOVED;
191 event->pair = NULL; /* prevents the paired event to be emitted as well */
196 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
197 child, other, eflags);
199 /* For paired moves or moves whose mask has been changed from IN_MOVED_TO to
200 * IN_CREATE, notify also that it's probably the last change to the file,
201 * emitting CHANGES_DONE_HINT.
202 * The first (first part of the if's guard below) is the case of a normal
203 * move within the monitored tree and in the same mounted volume.
204 * The latter (second part of the guard) is the case of a move within the
205 * same mounted volume, but from a not monitored directory.
207 * It's not needed in cases like moves across mounted volumes as the IN_CREATE
208 * will be followed by a IN_MODIFY and IN_CLOSE_WRITE events.
209 * Also not needed if sub->pair_moves is set as EVENT_MOVED will be emitted
210 * instead of EVENT_CREATED which implies no further modification will be
211 * applied to the file
212 * See: https://bugzilla.gnome.org/show_bug.cgi?id=640077
214 if ((!sub->pair_moves &&
215 event->is_second_in_pair && (event->mask & IN_MOVED_TO)) ||
216 (!ih_event_is_paired_move (event) &&
217 (event->original_mask & IN_MOVED_TO) && (event->mask & IN_CREATE)))
219 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
220 child, NULL, G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT);
223 g_object_unref (child);
225 g_object_unref (other);
229 ih_not_missing_callback (inotify_sub *sub)
232 GFileMonitorEvent eflags;
238 fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename);
239 g_warning ("Missing callback called fullpath = %s\n", fullpath);
240 if (!g_file_test (fullpath, G_FILE_TEST_EXISTS))
249 fullpath = g_strdup_printf ("%s", sub->dirname);
250 mask = IN_CREATE|IN_ISDIR;
253 eflags = ih_mask_to_EventFlags (mask);
254 child = g_file_new_for_path (fullpath);
257 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data),
258 child, NULL, eflags);
260 g_object_unref (child);
263 /* Transforms a inotify event to a GVFS event. */
264 static GFileMonitorEvent
265 ih_mask_to_EventFlags (guint32 mask)
271 return G_FILE_MONITOR_EVENT_CHANGED;
273 return G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT;
275 return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED;
280 return G_FILE_MONITOR_EVENT_DELETED;
283 return G_FILE_MONITOR_EVENT_CREATED;
285 return G_FILE_MONITOR_EVENT_UNMOUNTED;
288 case IN_CLOSE_NOWRITE: