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3f65d731 ZJS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
bd284db1 | 3 | /* |
1298001e | 4 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
bd284db1 | 5 | * Copyright (C) 2009 Canonical Ltd. |
64746532 | 6 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> |
bd284db1 SJR |
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, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
bd284db1 | 22 | #include <dirent.h> |
cf0fbc49 | 23 | #include <errno.h> |
bd284db1 | 24 | #include <stddef.h> |
cf0fbc49 | 25 | #include <stdio.h> |
bd284db1 | 26 | #include <sys/inotify.h> |
cf0fbc49 | 27 | #include <unistd.h> |
bd284db1 | 28 | |
d054f0a4 | 29 | #include "stdio-util.h" |
bd284db1 SJR |
30 | #include "udev.h" |
31 | ||
1e03b754 | 32 | static int inotify_fd = -1; |
bd284db1 SJR |
33 | |
34 | /* inotify descriptor, will be shared with rules directory; | |
35 | * set to cloexec since we need our children to be able to add | |
36 | * watches for us | |
37 | */ | |
9ec6e95b | 38 | int udev_watch_init(struct udev *udev) { |
912541b0 KS |
39 | inotify_fd = inotify_init1(IN_CLOEXEC); |
40 | if (inotify_fd < 0) | |
56f64d95 | 41 | log_error_errno(errno, "inotify_init failed: %m"); |
912541b0 | 42 | return inotify_fd; |
bd284db1 SJR |
43 | } |
44 | ||
45 | /* move any old watches directory out of the way, and then restore | |
46 | * the watches | |
47 | */ | |
9ec6e95b | 48 | void udev_watch_restore(struct udev *udev) { |
912541b0 KS |
49 | if (inotify_fd < 0) |
50 | return; | |
51 | ||
6ada823a | 52 | if (rename("/run/udev/watch", "/run/udev/watch.old") == 0) { |
912541b0 KS |
53 | DIR *dir; |
54 | struct dirent *ent; | |
55 | ||
6ada823a | 56 | dir = opendir("/run/udev/watch.old"); |
912541b0 | 57 | if (dir == NULL) { |
56f64d95 | 58 | log_error_errno(errno, "unable to open old watches dir /run/udev/watch.old; old watches will not be restored: %m"); |
912541b0 KS |
59 | return; |
60 | } | |
61 | ||
62 | for (ent = readdir(dir); ent != NULL; ent = readdir(dir)) { | |
63 | char device[UTIL_PATH_SIZE]; | |
912541b0 KS |
64 | ssize_t len; |
65 | struct udev_device *dev; | |
66 | ||
67 | if (ent->d_name[0] == '.') | |
68 | continue; | |
69 | ||
6ada823a KS |
70 | len = readlinkat(dirfd(dir), ent->d_name, device, sizeof(device)); |
71 | if (len <= 0 || len == (ssize_t)sizeof(device)) | |
912541b0 | 72 | goto unlink; |
6ada823a | 73 | device[len] = '\0'; |
912541b0 | 74 | |
dbf61afb | 75 | dev = udev_device_new_from_device_id(udev, device); |
912541b0 KS |
76 | if (dev == NULL) |
77 | goto unlink; | |
78 | ||
9f6445e3 | 79 | log_debug("restoring old watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 KS |
80 | udev_watch_begin(udev, dev); |
81 | udev_device_unref(dev); | |
777239cb | 82 | unlink: |
912541b0 KS |
83 | unlinkat(dirfd(dir), ent->d_name, 0); |
84 | } | |
bd284db1 | 85 | |
912541b0 | 86 | closedir(dir); |
6ada823a | 87 | rmdir("/run/udev/watch.old"); |
bd284db1 | 88 | |
1f6b4113 | 89 | } else if (errno != ENOENT) |
56f64d95 | 90 | log_error_errno(errno, "unable to move watches dir /run/udev/watch; old watches will not be restored: %m"); |
bd284db1 SJR |
91 | } |
92 | ||
9ec6e95b | 93 | void udev_watch_begin(struct udev *udev, struct udev_device *dev) { |
912541b0 KS |
94 | char filename[UTIL_PATH_SIZE]; |
95 | int wd; | |
6bb2f0a0 | 96 | int r; |
912541b0 KS |
97 | |
98 | if (inotify_fd < 0) | |
99 | return; | |
100 | ||
9f6445e3 | 101 | log_debug("adding watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 KS |
102 | wd = inotify_add_watch(inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE); |
103 | if (wd < 0) { | |
56f64d95 | 104 | log_error_errno(errno, "inotify_add_watch(%d, %s, %o) failed: %m", |
1f6b4113 | 105 | inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE); |
912541b0 KS |
106 | return; |
107 | } | |
108 | ||
d054f0a4 | 109 | xsprintf(filename, "/run/udev/watch/%d", wd); |
667e3924 | 110 | mkdir_parents(filename, 0755); |
912541b0 | 111 | unlink(filename); |
6bb2f0a0 VP |
112 | r = symlink(udev_device_get_id_filename(dev), filename); |
113 | if (r < 0) | |
56f64d95 | 114 | log_error_errno(errno, "Failed to create symlink %s: %m", filename); |
912541b0 KS |
115 | |
116 | udev_device_set_watch_handle(dev, wd); | |
bd284db1 SJR |
117 | } |
118 | ||
9ec6e95b | 119 | void udev_watch_end(struct udev *udev, struct udev_device *dev) { |
912541b0 KS |
120 | int wd; |
121 | char filename[UTIL_PATH_SIZE]; | |
bd284db1 | 122 | |
912541b0 KS |
123 | if (inotify_fd < 0) |
124 | return; | |
03e0170d | 125 | |
912541b0 KS |
126 | wd = udev_device_get_watch_handle(dev); |
127 | if (wd < 0) | |
128 | return; | |
bd284db1 | 129 | |
9f6445e3 | 130 | log_debug("removing watch on '%s'", udev_device_get_devnode(dev)); |
912541b0 | 131 | inotify_rm_watch(inotify_fd, wd); |
bd284db1 | 132 | |
d054f0a4 | 133 | xsprintf(filename, "/run/udev/watch/%d", wd); |
912541b0 | 134 | unlink(filename); |
047f88bc | 135 | |
912541b0 | 136 | udev_device_set_watch_handle(dev, -1); |
bd284db1 SJR |
137 | } |
138 | ||
9ec6e95b | 139 | struct udev_device *udev_watch_lookup(struct udev *udev, int wd) { |
912541b0 | 140 | char filename[UTIL_PATH_SIZE]; |
6ada823a | 141 | char device[UTIL_NAME_SIZE]; |
912541b0 KS |
142 | ssize_t len; |
143 | ||
144 | if (inotify_fd < 0 || wd < 0) | |
145 | return NULL; | |
146 | ||
d054f0a4 | 147 | xsprintf(filename, "/run/udev/watch/%d", wd); |
6ada823a KS |
148 | len = readlink(filename, device, sizeof(device)); |
149 | if (len <= 0 || (size_t)len == sizeof(device)) | |
912541b0 | 150 | return NULL; |
6ada823a | 151 | device[len] = '\0'; |
912541b0 | 152 | |
dbf61afb | 153 | return udev_device_new_from_device_id(udev, device); |
bd284db1 | 154 | } |