2 * libudev - interface to udev device information
4 * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
23 #include "libudev-private.h"
25 static void udev_device_tag(struct udev_device *dev, const char *tag, bool add)
27 struct udev *udev = udev_device_get_udev(dev);
28 char filename[UTIL_PATH_SIZE];
30 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/tags/", tag, "/",
31 udev_device_get_subsystem(dev), ":", udev_device_get_sysname(dev), NULL);
34 util_create_path(udev, filename);
35 symlink(udev_device_get_devpath(dev), filename);
36 /* possibly cleanup old entries after a device renaming */
37 if (udev_device_get_sysname_old(dev) != NULL) {
38 char filename_old[UTIL_PATH_SIZE];
40 util_strscpyl(filename_old, sizeof(filename_old), udev_get_dev_path(udev), "/.udev/tags/", tag, "/",
41 udev_device_get_subsystem(dev), ":", udev_device_get_sysname_old(dev), NULL);
49 int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add)
51 struct udev_list_entry *list_entry;
54 if (add && dev_old != NULL) {
55 /* delete possible left-over tags */
56 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) {
57 const char *tag_old = udev_list_entry_get_name(list_entry);
58 struct udev_list_entry *list_entry_current;
61 udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) {
62 const char *tag = udev_list_entry_get_name(list_entry_current);
64 if (strcmp(tag, tag_old) == 0) {
70 udev_device_tag(dev_old, tag_old, false);
74 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev))
75 udev_device_tag(dev, udev_list_entry_get_name(list_entry), add);
80 int udev_device_update_db(struct udev_device *udev_device)
82 struct udev *udev = udev_device_get_udev(udev_device);
83 char filename[UTIL_PATH_SIZE];
84 char filename_tmp[UTIL_PATH_SIZE];
86 char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
87 size_t devlen = strlen(udev_get_dev_path(udev))+1;
90 struct udev_list_entry *list_entry;
93 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
94 udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
95 util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
97 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
98 if (udev_list_entry_get_flags(list_entry))
100 if (udev_device_get_tags_list_entry(udev_device) != NULL)
102 if (udev_device_get_devlink_priority(udev_device) != 0)
104 if (udev_device_get_event_timeout(udev_device) >= 0)
106 if (udev_device_get_watch_handle(udev_device) >= 0)
108 if (udev_device_get_devnode(udev_device) == NULL)
112 * if we have only the node and symlinks to store, try not to waste
113 * tmpfs memory -- store values, if they fit, in a symlink target
116 l = util_strpcpy(&s, sizeof(target), &udev_device_get_devnode(udev_device)[devlen]);
117 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
118 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
120 info(udev, "size of links too large, create file\n");
124 udev_selinux_setfscreatecon(udev, filename_tmp, S_IFLNK);
125 util_create_path(udev, filename_tmp);
126 ret = symlink(target, filename_tmp);
127 udev_selinux_resetfscreatecon(udev);
130 ret = rename(filename_tmp, filename);
133 info(udev, "created db link (%s)\n", target);
136 util_create_path(udev, filename_tmp);
137 f = fopen(filename_tmp, "w");
139 err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
143 if (udev_device_get_devnode(udev_device) != NULL) {
144 fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
145 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
146 fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
148 if (udev_device_get_devlink_priority(udev_device) != 0)
149 fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
150 if (udev_device_get_event_timeout(udev_device) >= 0)
151 fprintf(f, "T:%i\n", udev_device_get_event_timeout(udev_device));
152 if (udev_device_get_watch_handle(udev_device) >= 0)
153 fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
154 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
155 if (!udev_list_entry_get_flags(list_entry))
157 fprintf(f, "E:%s=%s\n",
158 udev_list_entry_get_name(list_entry),
159 udev_list_entry_get_value(list_entry));
161 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
162 fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
164 rename(filename_tmp, filename);
165 info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
170 int udev_device_delete_db(struct udev_device *udev_device)
172 struct udev *udev = udev_device_get_udev(udev_device);
173 char filename[UTIL_PATH_SIZE];
175 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
176 udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);