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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
42 /* use a static array to avoid handling OOM */
43 static int wds[MAX_DIRS_TO_WATCH];
44 static int num_wds = 0;
45 static int inotify_fd = -1;
46 static DBusWatch *watch = NULL;
47 static DBusLoop *loop = NULL;
50 _inotify_watch_callback (DBusWatch *watch, unsigned int condition, void *data)
52 return dbus_watch_handle (watch, condition);
56 _handle_inotify_watch (DBusWatch *watch, unsigned int flags, void *data)
58 struct inotify_event ev;
62 res = read (inotify_fd, &ev, sizeof(ev));
67 _dbus_verbose ("Sending SIGHUP signal on reception of a inotify event\n");
68 (void) kill (pid, SIGHUP);
70 else if (res < 0 && errno == EBADF)
74 _dbus_loop_remove_watch (loop, watch, _inotify_watch_callback, NULL);
75 _dbus_watch_unref (watch);
79 _dbus_verbose ("Sending SIGHUP signal since inotify fd has been closed\n");
80 (void) kill (pid, SIGHUP);
86 bus_watch_directory (const char *dir, BusContext *context)
90 _dbus_assert (dir != NULL);
92 if (inotify_fd == -1) {
93 inotify_fd = inotify_init ();
94 if (inotify_fd <= 0) {
95 _dbus_warn ("Cannot initialize inotify\n");
98 loop = bus_context_get_loop (context);
100 watch = _dbus_watch_new (inotify_fd, DBUS_WATCH_READABLE, TRUE,
101 _handle_inotify_watch, NULL, NULL);
105 _dbus_warn ("Unable to create inotify watch\n");
109 if (!_dbus_loop_add_watch (loop, watch, _inotify_watch_callback,
112 _dbus_warn ("Unable to add reload watch to main loop");
113 _dbus_watch_unref (watch);
120 if (num_wds >= MAX_DIRS_TO_WATCH )
122 _dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
126 wd = inotify_add_watch (inotify_fd, dir, IN_MODIFY);
129 _dbus_warn ("Cannot setup inotify for '%s'; error '%s'\n", dir, _dbus_strerror (errno));
134 _dbus_verbose ("Added watch on config directory '%s'\n", dir);
141 bus_drop_all_directory_watches (void)
145 _dbus_verbose ("Dropping all watches on config directories\n");
147 for (i = 0; i < num_wds; i++)
149 if (inotify_rm_watch(inotify_fd, wds[i]) != 0)
151 _dbus_verbose ("Error closing fd %d for config directory watch\n", wds[i]);