Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 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 |
| 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 |
| 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 | } |