1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dir-watch-kqueue.c OS specific directory change notification for message bus
4 * Copyright (C) 2003 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
27 #include <sys/event.h>
37 #include <dbus/dbus-watch.h>
39 #include <dbus/dbus-internals.h>
40 #include <dbus/dbus-list.h>
41 #include <dbus/dbus-sysdeps-unix.h>
42 #include "dir-watch.h"
44 #define MAX_DIRS_TO_WATCH 128
47 static int fds[MAX_DIRS_TO_WATCH];
48 static char *dirs[MAX_DIRS_TO_WATCH];
49 static int num_fds = 0;
50 static DBusWatch *watch = NULL;
51 static DBusLoop *loop = NULL;
54 _handle_kqueue_watch (DBusWatch *watch, unsigned int flags, void *data)
57 struct timespec nullts = { 0, 0 };
61 res = kevent (kq, NULL, 0, &ev, 1, &nullts);
63 /* Sleep for half a second to avoid a race when files are install(1)'d
70 _dbus_verbose ("Sending SIGHUP signal on reception of a kevent\n");
71 (void) kill (pid, SIGHUP);
73 else if (res < 0 && errno == EBADF)
78 _dbus_loop_remove_watch (loop, watch);
79 _dbus_watch_invalidate (watch);
80 _dbus_watch_unref (watch);
84 _dbus_verbose ("Sending SIGHUP signal since kqueue has been closed\n");
85 (void) kill (pid, SIGHUP);
91 static void _shutdown_kqueue (void *data)
98 for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
107 /* dbus_free() is necessary to pass memleak check */
115 _dbus_loop_remove_watch (loop, watch);
116 _dbus_loop_unref (loop);
122 _dbus_watch_invalidate (watch);
123 _dbus_watch_unref (watch);
132 _init_kqueue (BusContext *context)
140 _dbus_warn ("Cannot create kqueue; error '%s'", _dbus_strerror (errno));
144 loop = bus_context_get_loop (context);
145 _dbus_loop_ref (loop);
147 watch = _dbus_watch_new (kq, DBUS_WATCH_READABLE, TRUE,
148 _handle_kqueue_watch, NULL, NULL);
152 _dbus_warn ("Unable to create kqueue watch");
156 if (!_dbus_loop_add_watch (loop, watch))
158 _dbus_warn ("Unable to add reload watch to main loop");
162 if (!_dbus_register_shutdown_func (_shutdown_kqueue, NULL))
164 _dbus_warn ("Unable to register shutdown function");
172 _dbus_loop_remove_watch (loop, watch);
177 _dbus_watch_invalidate (watch);
178 _dbus_watch_unref (watch);
190 _dbus_loop_unref (loop);
199 bus_set_watched_dirs (BusContext *context, DBusList **directories)
201 int new_fds[MAX_DIRS_TO_WATCH];
202 char *new_dirs[MAX_DIRS_TO_WATCH];
207 dbus_bool_t cloexec_done = 0;
210 if (!_init_kqueue (context))
213 for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
220 link = _dbus_list_get_first_link (directories);
223 new_dirs[i++] = (char *)link->data;
224 link = _dbus_list_get_next_link (directories, link);
227 /* Look for directories in both the old and new sets, if
228 * we find one, move its data into the new set.
230 for (i = 0; new_dirs[i]; i++)
232 for (j = 0; j < num_fds; j++)
234 if (dirs[j] && strcmp (new_dirs[i], dirs[j]) == 0)
237 new_dirs[i] = dirs[j];
245 /* Any directory we find in "fds" with a nonzero fd must
246 * not be in the new set, so perform cleanup now.
248 for (j = 0; j < num_fds; j++)
259 for (i = 0; new_dirs[i]; i++)
261 if (new_fds[i] == -1)
263 /* FIXME - less lame error handling for failing to add a watch;
264 * we may need to sleep.
267 fd = open (new_dirs[i], O_RDONLY | O_CLOEXEC);
268 cloexec_done = (fd >= 0);
270 if (fd < 0 && errno == EINVAL)
273 fd = open (new_dirs[i], O_RDONLY);
279 _dbus_warn ("Cannot open directory '%s'; error '%s'", new_dirs[i], _dbus_strerror (errno));
293 _dbus_fd_set_close_on_exec (fd);
296 EV_SET (&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
297 NOTE_DELETE | NOTE_EXTEND | NOTE_WRITE | NOTE_RENAME, 0, 0);
298 if (kevent (kq, &ev, 1, NULL, 0, NULL) == -1)
300 _dbus_warn ("Cannot setup a kevent for '%s'; error '%s'", new_dirs[i], _dbus_strerror (errno));
306 new_dirs[i] = _dbus_strdup (new_dirs[i]);
309 /* FIXME have less lame handling for OOM, we just silently fail to
310 * watch. (In reality though, the whole OOM handling in dbus is
311 * stupid but we won't go into that in this comment =) )
321 for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
324 dirs[i] = new_dirs[i];