1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dir-watch-dnotify.c OS specific directory change notification for message bus
3 *
4 * Copyright (C) 2003 Red Hat, Inc.
5 *
6 * Licensed under the Academic Free License version 2.1
7 *
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.
12 *
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.
17 *
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
21 *
22 */
23
24 #include <config.h>
25
26 #define _GNU_SOURCE
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <fcntl.h>
30 #ifdef HAVE_ERRNO_H
31 #include <errno.h>
32 #endif
33
34 #include <dbus/dbus-internals.h>
35 #include "dir-watch.h"
36
37 #define MAX_DIRS_TO_WATCH 128
38
39 /* use a static array to avoid handling OOM */
40 static int fds[MAX_DIRS_TO_WATCH];
41 static int num_fds = 0;
42
43 void
bus_watch_directory(const char * dir,BusContext * context)44 bus_watch_directory (const char *dir, BusContext *context)
45 {
46 int fd;
47
48 _dbus_assert (dir != NULL);
49
50 if (num_fds >= MAX_DIRS_TO_WATCH )
51 {
52 _dbus_warn ("Cannot watch config directory '%s'. Already watching %d directories\n", dir, MAX_DIRS_TO_WATCH);
53 goto out;
54 }
55
56 fd = open (dir, O_RDONLY);
57 if (fd < 0)
58 {
59 _dbus_warn ("Cannot open directory '%s'; error '%s'\n", dir, _dbus_strerror (errno));
60 goto out;
61 }
62
63 if (fcntl (fd, F_NOTIFY, DN_CREATE|DN_DELETE|DN_RENAME|DN_MODIFY) == -1)
64 {
65 _dbus_warn ("Cannot setup D_NOTIFY for '%s' error '%s'\n", dir, _dbus_strerror (errno));
66 close (fd);
67 goto out;
68 }
69
70 fds[num_fds++] = fd;
71 _dbus_verbose ("Added watch on config directory '%s'\n", dir);
72
73 out:
74 ;
75 }
76
77 void
bus_drop_all_directory_watches(void)78 bus_drop_all_directory_watches (void)
79 {
80 int i;
81
82 _dbus_verbose ("Dropping all watches on config directories\n");
83
84 for (i = 0; i < num_fds; i++)
85 {
86 if (close (fds[i]) != 0)
87 {
88 _dbus_verbose ("Error closing fd %d for config directory watch\n", fds[i]);
89 }
90 }
91
92 num_fds = 0;
93 }
94