2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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/>.
30 #include "libudev-private.h"
32 struct udev_enumerate {
35 struct list_node devices_list;
38 struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
40 if (udev_enumerate == NULL)
42 udev_enumerate->refcount++;
43 return udev_enumerate;
46 void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
48 if (udev_enumerate == NULL)
50 udev_enumerate->refcount--;
51 if (udev_enumerate->refcount > 0)
53 list_cleanup(udev_enumerate->udev, &udev_enumerate->devices_list);
57 struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate)
59 if (udev_enumerate == NULL)
61 return udev_enumerate->udev;
64 struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate)
66 if (udev_enumerate == NULL)
68 return list_get_entry(&udev_enumerate->devices_list);
71 static int devices_scan_subsystem(struct udev *udev,
72 const char *basedir, const char *subsystem, const char *subdir,
73 struct list_node *devices_list)
75 char path[UTIL_PATH_SIZE];
79 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
80 util_strlcat(path, basedir, sizeof(path));
81 util_strlcat(path, "/", sizeof(path));
82 util_strlcat(path, subsystem, sizeof(path));
84 util_strlcat(path, subdir, sizeof(path));
88 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
89 char syspath[UTIL_PATH_SIZE];
91 if (dent->d_name[0] == '.')
93 util_strlcpy(syspath, path, sizeof(syspath));
94 util_strlcat(syspath, "/", sizeof(syspath));
95 util_strlcat(syspath, dent->d_name, sizeof(syspath));
96 util_resolve_sys_link(udev, syspath, sizeof(syspath));
97 list_entry_add(udev, devices_list, syspath, NULL, 1, 1);
103 static int devices_scan_subsystems(struct udev *udev,
104 const char *basedir, const char *subdir,
105 struct udev_list_entry *subsystem_include_list,
106 struct udev_list_entry *subsystem_exclude_list,
107 struct list_node *devices_list)
109 if (subsystem_include_list != NULL) {
110 struct udev_list_entry *list_entry;
112 /* if list of subsystems to scan is given, just use this list */
113 udev_list_entry_foreach(list_entry, subsystem_include_list)
114 devices_scan_subsystem(udev, basedir, udev_list_entry_get_name(list_entry), subdir, devices_list);
116 char path[UTIL_PATH_SIZE];
120 /* if no list of subsystems to scan is given, scan all, and possible exclude some subsystems */
121 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
122 util_strlcat(path, basedir, sizeof(path));
126 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
127 if (dent->d_name[0] == '.')
129 if (udev_list_entry_get_by_name(subsystem_exclude_list, dent->d_name) != NULL)
131 devices_scan_subsystem(udev, basedir, dent->d_name, subdir, devices_list);
138 static int devices_delay(struct udev *udev, const char *syspath)
140 static const char *delay_device_list[] = {
148 len = strlen(udev_get_sys_path(udev));
150 for (i = 0; delay_device_list[i] != NULL; i++) {
151 if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
152 info(udev, "delaying: %s\n", syspath);
160 * udev_enumerate_new_from_devices:
161 * @udev: udev library context
162 * @subsystem: the list of names of subsystems to look for devices
164 * Returns: an enumeration context
166 struct udev_enumerate *udev_enumerate_new_from_devices(struct udev *udev, const char *subsystem, ...)
168 struct udev_enumerate *udev_enumerate;
171 char base[UTIL_PATH_SIZE];
173 struct list_node subsystem_include_list;
174 struct list_node subsystem_exclude_list;
175 struct udev_list_entry *list_entry;
180 udev_enumerate = malloc(sizeof(struct udev_enumerate));
181 if (udev_enumerate == NULL)
183 memset(udev_enumerate, 0x00, (sizeof(struct udev_enumerate)));
184 udev_enumerate->refcount = 1;
185 udev_enumerate->udev = udev;
186 list_init(&udev_enumerate->devices_list);
188 va_start(vargs, subsystem);
189 list_init(&subsystem_include_list);
190 list_init(&subsystem_exclude_list);
191 for (arg = subsystem; arg != NULL; arg = va_arg(vargs, const char *)) {
193 list_entry_add(udev, &subsystem_include_list, arg, NULL, 1, 0);
195 list_entry_add(udev, &subsystem_exclude_list, &arg[1], NULL, 1, 0);
199 /* if we have /sys/subsystem/, forget all the old stuff */
200 util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
201 util_strlcat(base, "/subsystem", sizeof(base));
202 if (stat(base, &statbuf) == 0) {
203 info(udev, "searching 'subsystem/*/devices/*' dir\n");
204 devices_scan_subsystems(udev, "/subsystem", "/devices",
205 list_get_entry(&subsystem_include_list),
206 list_get_entry(&subsystem_exclude_list),
207 &udev_enumerate->devices_list);
209 info(udev, "searching 'bus/*/devices/*' dir\n");
210 devices_scan_subsystems(udev, "/bus", "/devices",
211 list_get_entry(&subsystem_include_list),
212 list_get_entry(&subsystem_exclude_list),
213 &udev_enumerate->devices_list);
214 info(udev, "searching 'class/*' dir\n");
215 devices_scan_subsystems(udev, "/class", NULL,
216 list_get_entry(&subsystem_include_list),
217 list_get_entry(&subsystem_exclude_list),
218 &udev_enumerate->devices_list);
221 list_cleanup(udev, &subsystem_include_list);
222 list_cleanup(udev, &subsystem_exclude_list);
224 /* sort delayed devices to the end of the list */
225 udev_list_entry_foreach(list_entry, list_get_entry(&udev_enumerate->devices_list)) {
226 if (devices_delay(udev, udev_list_entry_get_name(list_entry)))
227 list_entry_move_to_end(list_entry);
229 return udev_enumerate;
232 struct udev_enumerate *udev_enumerate_new_from_subsystems(struct udev *udev)