]>
Commit | Line | Data |
---|---|---|
bd284db1 | 1 | /* |
1298001e | 2 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
bd284db1 | 3 | * Copyright (C) 2009 Canonical Ltd. |
64746532 | 4 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> |
bd284db1 SJR |
5 | * |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <sys/types.h> | |
21 | #include <errno.h> | |
22 | #include <fcntl.h> | |
23 | #include <stdio.h> | |
24 | #include <dirent.h> | |
25 | #include <stddef.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <unistd.h> | |
bd284db1 | 29 | #include <sys/inotify.h> |
bd284db1 SJR |
30 | |
31 | #include "udev.h" | |
32 | ||
1e03b754 | 33 | static int inotify_fd = -1; |
bd284db1 SJR |
34 | |
35 | /* inotify descriptor, will be shared with rules directory; | |
36 | * set to cloexec since we need our children to be able to add | |
37 | * watches for us | |
38 | */ | |
9ec6e95b | 39 | int udev_watch_init(struct udev *udev) { |
912541b0 KS |
40 | inotify_fd = inotify_init1(IN_CLOEXEC); |
41 | if (inotify_fd < 0) | |
56f64d95 | 42 | log_error_errno(errno, "inotify_init failed: %m"); |
912541b0 | 43 | return inotify_fd; |
bd284db1 SJR |
44 | } |
45 | ||
46 | /* move any old watches directory out of the way, and then restore | |
47 | * the watches | |
48 | */ | |
9ec6e95b | 49 | void udev_watch_restore(struct udev *udev) { |
912541b0 KS |
50 | if (inotify_fd < 0) |
51 | return; | |
52 | ||
6ada823a | 53 | if (rename("/run/udev/watch", "/run/udev/watch.old") == 0) { |
912541b0 KS |
54 | DIR *dir; |
55 | struct dirent *ent; | |
56 | ||
6ada823a | 57 | dir = opendir("/run/udev/watch.old"); |
912541b0 | 58 | if (dir == NULL) { |
56f64d95 | 59 | log_error_errno(errno, "unable to open old watches dir /run/udev/watch.old; old watches will not be restored: %m"); |
912541b0 KS |
60 | return; |
61 | } | |
62 | ||
63 | for (ent = readdir(dir); ent != NULL; ent = readdir(dir)) { | |
64 | char device[UTIL_PATH_SIZE]; | |
912541b0 KS |
65 | ssize_t len; |
66 | struct udev_device *dev; | |
67 | ||
68 | if (ent->d_name[0] == '.') | |
69 | continue; | |
70 | ||
6ada823a KS |
71 | len = readlinkat(dirfd(dir), ent->d_name, device, sizeof(device)); |
72 | if (len <= 0 || len == (ssize_t)sizeof(device)) | |
912541b0 | 73 | goto unlink; |
6ada823a | 74 | device[len] = '\0'; |
912541b0 | 75 | |
dbf61afb | 76 | dev = udev_device_new_from_device_id(udev, device); |
912541b0 KS |
77 | if (dev == NULL) |
78 | goto unlink; | |
79 | ||
9f6445e3 | 80 | log_debug("restoring old watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 KS |
81 | udev_watch_begin(udev, dev); |
82 | udev_device_unref(dev); | |
777239cb | 83 | unlink: |
912541b0 KS |
84 | unlinkat(dirfd(dir), ent->d_name, 0); |
85 | } | |
bd284db1 | 86 | |
912541b0 | 87 | closedir(dir); |
6ada823a | 88 | rmdir("/run/udev/watch.old"); |
bd284db1 | 89 | |
912541b0 | 90 | } else if (errno != ENOENT) { |
56f64d95 | 91 | log_error_errno(errno, "unable to move watches dir /run/udev/watch; old watches will not be restored: %m"); |
912541b0 | 92 | } |
bd284db1 SJR |
93 | } |
94 | ||
9ec6e95b | 95 | void udev_watch_begin(struct udev *udev, struct udev_device *dev) { |
912541b0 KS |
96 | char filename[UTIL_PATH_SIZE]; |
97 | int wd; | |
6bb2f0a0 | 98 | int r; |
912541b0 KS |
99 | |
100 | if (inotify_fd < 0) | |
101 | return; | |
102 | ||
9f6445e3 | 103 | log_debug("adding watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 KS |
104 | wd = inotify_add_watch(inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE); |
105 | if (wd < 0) { | |
56f64d95 | 106 | log_error_errno(errno, "inotify_add_watch(%d, %s, %o) failed: %m", |
912541b0 KS |
107 | inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE); |
108 | return; | |
109 | } | |
110 | ||
6ada823a | 111 | snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd); |
667e3924 | 112 | mkdir_parents(filename, 0755); |
912541b0 | 113 | unlink(filename); |
6bb2f0a0 VP |
114 | r = symlink(udev_device_get_id_filename(dev), filename); |
115 | if (r < 0) | |
56f64d95 | 116 | log_error_errno(errno, "Failed to create symlink %s: %m", filename); |
912541b0 KS |
117 | |
118 | udev_device_set_watch_handle(dev, wd); | |
bd284db1 SJR |
119 | } |
120 | ||
9ec6e95b | 121 | void udev_watch_end(struct udev *udev, struct udev_device *dev) { |
912541b0 KS |
122 | int wd; |
123 | char filename[UTIL_PATH_SIZE]; | |
bd284db1 | 124 | |
912541b0 KS |
125 | if (inotify_fd < 0) |
126 | return; | |
03e0170d | 127 | |
912541b0 KS |
128 | wd = udev_device_get_watch_handle(dev); |
129 | if (wd < 0) | |
130 | return; | |
bd284db1 | 131 | |
9f6445e3 | 132 | log_debug("removing watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 | 133 | inotify_rm_watch(inotify_fd, wd); |
bd284db1 | 134 | |
6ada823a | 135 | snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd); |
912541b0 | 136 | unlink(filename); |
047f88bc | 137 | |
912541b0 | 138 | udev_device_set_watch_handle(dev, -1); |
bd284db1 SJR |
139 | } |
140 | ||
9ec6e95b | 141 | struct udev_device *udev_watch_lookup(struct udev *udev, int wd) { |
912541b0 | 142 | char filename[UTIL_PATH_SIZE]; |
6ada823a | 143 | char device[UTIL_NAME_SIZE]; |
912541b0 KS |
144 | ssize_t len; |
145 | ||
146 | if (inotify_fd < 0 || wd < 0) | |
147 | return NULL; | |
148 | ||
6ada823a KS |
149 | snprintf(filename, sizeof(filename), "/run/udev/watch/%d", wd); |
150 | len = readlink(filename, device, sizeof(device)); | |
151 | if (len <= 0 || (size_t)len == sizeof(device)) | |
912541b0 | 152 | return NULL; |
6ada823a | 153 | device[len] = '\0'; |
912541b0 | 154 | |
dbf61afb | 155 | return udev_device_new_from_device_id(udev, device); |
bd284db1 | 156 | } |