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_head 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_list *udev_enumerate_get_devices_list(struct udev_enumerate *udev_enumerate)
59 if (udev_enumerate == NULL)
61 return list_get_entry(&udev_enumerate->devices_list);
64 static int devices_scan_subsystem(struct udev *udev,
65 const char *basedir, const char *subsystem, const char *subdir,
66 struct list_head *device_list)
68 char path[UTIL_PATH_SIZE];
72 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
73 util_strlcat(path, basedir, sizeof(path));
74 util_strlcat(path, "/", sizeof(path));
75 util_strlcat(path, subsystem, sizeof(path));
77 util_strlcat(path, subdir, sizeof(path));
81 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
82 char syspath[UTIL_PATH_SIZE];
84 if (dent->d_name[0] == '.')
86 util_strlcpy(syspath, path, sizeof(syspath));
87 util_strlcat(syspath, "/", sizeof(syspath));
88 util_strlcat(syspath, dent->d_name, sizeof(syspath));
89 util_resolve_sys_link(udev, syspath, sizeof(syspath));
90 list_insert(udev, device_list, syspath, NULL, 1);
96 static int devices_scan_subsystems(struct udev *udev,
97 const char *basedir, const char *subsystem, const char *subdir,
98 struct list_head *device_list)
100 char path[UTIL_PATH_SIZE];
104 if (subsystem != NULL)
105 return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list);
107 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
108 util_strlcat(path, basedir, sizeof(path));
112 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
113 if (dent->d_name[0] == '.')
115 devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list);
121 static int devices_delay(struct udev *udev, const char *syspath)
123 static const char *delay_device_list[] = {
131 len = strlen(udev_get_sys_path(udev));
133 for (i = 0; delay_device_list[i] != NULL; i++) {
134 if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
135 info(udev, "delaying: %s\n", syspath);
143 * udev_enumerate_new_from_subsystems:
144 * @udev: udev library context
145 * @subsystem: the subsystem to enumerate
147 * Returns: an enumeration context
149 struct udev_enumerate *udev_enumerate_new_from_subsystems(struct udev *udev, const char *subsystem)
151 struct udev_enumerate *udev_enumerate;
152 char base[UTIL_PATH_SIZE];
154 struct udev_list *list;
159 udev_enumerate = malloc(sizeof(struct udev_enumerate));
160 if (udev_enumerate == NULL)
162 memset(udev_enumerate, 0x00, (sizeof(struct udev_enumerate)));
163 udev_enumerate->refcount = 1;
164 udev_enumerate->udev = udev;
165 INIT_LIST_HEAD(&udev_enumerate->devices_list);
167 /* if we have /sys/subsystem/, forget all the old stuff */
168 util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
169 util_strlcat(base, "/subsystem", sizeof(base));
170 if (stat(base, &statbuf) == 0) {
171 devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &udev_enumerate->devices_list);
173 devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &udev_enumerate->devices_list);
174 devices_scan_subsystems(udev, "/class", subsystem, NULL, &udev_enumerate->devices_list);
177 /* sort delayed devices to the end of the list */
178 list = list_get_entry(&udev_enumerate->devices_list);
179 while (list != NULL) {
180 if (devices_delay(udev, udev_list_get_name(list)))
181 list_move_to_end(list, &udev_enumerate->devices_list);
182 list = udev_list_get_next(list);
184 return udev_enumerate;