1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dir-watch-inotify.c OS specific directory change notification for message bus
4 * Copyright (C) 2003 Red Hat, Inc.
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include <sys/inotify.h>
32 #include <sys/types.h>
36 #include <dbus/dbus-internals.h>
37 #include <dbus/dbus-watch.h>
38 #include "dir-watch.h"
40 #define MAX_DIRS_TO_WATCH 128
41 #define INOTIFY_EVENT_SIZE (sizeof(struct inotify_event))
42 #define INOTIFY_BUF_LEN (1024 * (INOTIFY_EVENT_SIZE + 16))
44 /* use a static array to avoid handling OOM */
45 static int wds[MAX_DIRS_TO_WATCH];
46 static int num_wds = 0;
47 static int inotify_fd = -1;
48 static DBusWatch *watch = NULL;
49 static DBusLoop *loop = NULL;
52 _inotify_watch_callback (DBusWatch *watch, unsigned int condition, void *data)
54 return dbus_watch_handle (watch, condition);
58 _handle_inotify_watch (DBusWatch *passed_watch, unsigned int flags, void *data)
60 char buffer[INOTIFY_BUF_LEN];
64 dbus_bool_t have_change = FALSE;
66 ret = read (inotify_fd, buffer, INOTIFY_BUF_LEN);
68 _dbus_verbose ("Error reading inotify event: '%s'\n", _dbus_strerror(errno));
70 _dbus_verbose ("Error reading inotify event: buffer too small\n");
74 struct inotify_event *ev;
75 pid = _dbus_getpid ();
77 ev = (struct inotify_event *) &buffer[i];
78 i += INOTIFY_EVENT_SIZE + ev->len;
79 #ifdef DBUS_ENABLE_VERBOSE_MODE
81 _dbus_verbose ("event name: '%s'\n", ev->name);
82 _dbus_verbose ("inotify event: wd=%d mask=%u cookie=%u len=%u\n", ev->wd, ev->mask, ev->cookie, ev->len);
84 _dbus_verbose ("Sending SIGHUP signal on reception of a inotify event\n");
88 (void) kill (pid, SIGHUP);
94 bus_watch_directory (const char *dir, BusContext *context)
98 _dbus_assert (dir != NULL);
100 if (inotify_fd == -1) {
101 inotify_fd = inotify_init ();
102 if (inotify_fd <= 0) {
103 _dbus_warn ("Cannot initialize inotify\n");
106 loop = bus_context_get_loop (context);
108 watch = _dbus_watch_new (inotify_fd, DBUS_WATCH_READABLE, TRUE,
109 _handle_inotify_watch, NULL, NULL);
113 _dbus_warn ("Unable to create inotify watch\n");
117 if (!_dbus_loop_add_watch (loop, watch, _inotify_watch_callback,
120 _dbus_warn ("Unable to add reload watch to main loop");
121 _dbus_watch_unref (watch);
127 if (num_wds >= MAX_DIRS_TO_WATCH )
129 _dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
133 wd = inotify_add_watch (inotify_fd, dir, IN_CLOSE_WRITE | IN_DELETE | IN_MOVED_TO | IN_MOVED_FROM);
136 _dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", dir, _dbus_strerror (errno));
141 _dbus_verbose ("Added watch on config directory '%s'\n", dir);
148 bus_drop_all_directory_watches (void)
154 _dbus_loop_remove_watch (loop, watch, _inotify_watch_callback, NULL);
155 _dbus_watch_unref (watch);
159 _dbus_verbose ("Dropping all watches on config directories\n");
160 ret = close (inotify_fd);
162 _dbus_verbose ("Error dropping watches: '%s'\n", _dbus_strerror(errno));