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 "dir-watch.h"
43
#define MAX_DIRS_TO_WATCH 128
46
static int fds[MAX_DIRS_TO_WATCH];
47
static char *dirs[MAX_DIRS_TO_WATCH];
48
static int num_fds = 0;
49
static DBusWatch *watch = NULL;
50
static DBusLoop *loop = NULL;
53
_kqueue_watch_callback (DBusWatch *watch, unsigned int condition, void *data)
55
return dbus_watch_handle (watch, condition);
59
_handle_kqueue_watch (DBusWatch *watch, unsigned int flags, void *data)
62
struct timespec nullts = { 0, 0 };
66
res = kevent (kq, NULL, 0, &ev, 1, &nullts);
68
/* Sleep for half a second to avoid a race when files are install(1)'d
75
_dbus_verbose ("Sending SIGHUP signal on reception of a kevent\n");
76
(void) kill (pid, SIGHUP);
78
else if (res < 0 && errno == EBADF)
83
_dbus_loop_remove_watch (loop, watch, _kqueue_watch_callback, NULL);
84
_dbus_watch_unref (watch);
88
_dbus_verbose ("Sending SIGHUP signal since kqueue has been closed\n");
89
(void) kill (pid, SIGHUP);
96
_init_kqueue (BusContext *context)
106
_dbus_warn ("Cannot create kqueue; error '%s'\n", _dbus_strerror (errno));
110
loop = bus_context_get_loop (context);
112
watch = _dbus_watch_new (kq, DBUS_WATCH_READABLE, TRUE,
113
_handle_kqueue_watch, NULL, NULL);
117
_dbus_warn ("Unable to create kqueue watch\n");
123
if (!_dbus_loop_add_watch (loop, watch, _kqueue_watch_callback,
126
_dbus_warn ("Unable to add reload watch to main loop");
129
_dbus_watch_unref (watch);
142
bus_set_watched_dirs (BusContext *context, DBusList **directories)
144
int new_fds[MAX_DIRS_TO_WATCH];
145
char *new_dirs[MAX_DIRS_TO_WATCH];
150
if (!_init_kqueue (context))
153
for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
160
link = _dbus_list_get_first_link (directories);
163
new_dirs[i++] = (char *)link->data;
164
link = _dbus_list_get_next_link (directories, link);
167
/* Look for directories in both the old and new sets, if
168
* we find one, move its data into the new set.
170
for (i = 0; new_dirs[i]; i++)
172
for (j = 0; i < num_fds; j++)
174
if (dirs[j] && strcmp (new_dirs[i], dirs[j]) == 0)
177
new_dirs[i] = dirs[j];
185
/* Any directory we find in "fds" with a nonzero fd must
186
* not be in the new set, so perform cleanup now.
188
for (j = 0; j < num_fds; j++)
199
for (i = 0; new_dirs[i]; i++)
201
if (new_fds[i] == -1)
203
/* FIXME - less lame error handling for failing to add a watch;
204
* we may need to sleep.
206
fd = open (new_dirs[i], O_RDONLY);
211
_dbus_warn ("Cannot open directory '%s'; error '%s'\n", new_dirs[i], _dbus_strerror (errno));
222
EV_SET (&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
223
NOTE_DELETE | NOTE_EXTEND | NOTE_WRITE | NOTE_RENAME, 0, 0);
224
if (kevent (kq, &ev, 1, NULL, 0, NULL) == -1)
226
_dbus_warn ("Cannot setup a kevent for '%s'; error '%s'\n", new_dirs[i], _dbus_strerror (errno));
232
new_dirs[i] = _dbus_strdup (new_dirs[i]);
235
/* FIXME have less lame handling for OOM, we just silently fail to
236
* watch. (In reality though, the whole OOM handling in dbus is
237
* stupid but we won't go into that in this comment =) )
247
for (i = 0; i < MAX_DIRS_TO_WATCH; i++)
250
dirs[i] = new_dirs[i];