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/>.
31 #include "libudev-private.h"
36 unsigned long long int last_seen_udev_seqnum;
37 struct udev_list_node queue_list;
38 struct udev_list_node failed_list;
41 struct udev_queue *udev_queue_new(struct udev *udev)
43 struct udev_queue *udev_queue;
48 udev_queue = calloc(1, sizeof(struct udev_queue));
49 if (udev_queue == NULL)
51 udev_queue->refcount = 1;
52 udev_queue->udev = udev;
53 udev_list_init(&udev_queue->queue_list);
54 udev_list_init(&udev_queue->failed_list);
58 struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
60 if (udev_queue == NULL)
62 udev_queue->refcount++;
66 void udev_queue_unref(struct udev_queue *udev_queue)
68 if (udev_queue == NULL)
70 udev_queue->refcount--;
71 if (udev_queue->refcount > 0)
73 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
74 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
78 struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
80 if (udev_queue == NULL)
82 return udev_queue->udev;
85 unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
87 char filename[UTIL_PATH_SIZE];
88 unsigned long long int seqnum;
93 if (udev_queue == NULL)
95 util_strlcpy(filename, udev_get_sys_path(udev_queue->udev), sizeof(filename));
96 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
97 fd = open(filename, O_RDONLY);
100 len = read(fd, buf, sizeof(buf));
105 seqnum = strtoull(buf, NULL, 10);
106 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
110 unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
112 char filename[UTIL_PATH_SIZE];
113 unsigned long long int seqnum;
118 if (udev_queue == NULL)
120 util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
121 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
122 fd = open(filename, O_RDONLY);
125 len = read(fd, buf, sizeof(buf));
130 seqnum = strtoull(buf, NULL, 10);
131 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
132 udev_queue->last_seen_udev_seqnum = seqnum;
136 int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
138 char filename[UTIL_PATH_SIZE];
141 if (udev_queue == NULL)
143 util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
144 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
145 if (stat(filename, &statbuf) == 0)
150 int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
152 char queuename[UTIL_PATH_SIZE];
154 unsigned long long int seqnum_kernel;
156 if (udev_queue == NULL)
158 util_strlcpy(queuename, udev_get_dev_path(udev_queue->udev), sizeof(queuename));
159 util_strlcat(queuename, "/.udev/queue", sizeof(queuename));
160 if (stat(queuename, &statbuf) == 0) {
161 dbg(udev_queue->udev, "queue is not empty\n");
164 seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
165 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
166 dbg(udev_queue->udev, "queue is empty\n");
169 /* update udev seqnum, and check if udev is still running */
170 if (udev_queue_get_udev_seqnum(udev_queue) == 0)
171 if (!udev_queue_get_udev_is_active(udev_queue))
173 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
174 dbg(udev_queue->udev, "queue is empty\n");
177 dbg(udev_queue->udev, "queue is empty, but kernel events still pending [%llu]<->[%llu]\n",
178 seqnum_kernel, udev_queue->last_seen_udev_seqnum);
182 int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
184 char filename[UTIL_PATH_SIZE];
187 if (udev_queue == NULL)
189 /* if we have not seen this seqnum, check if it is/was already queued */
190 if (seqnum < udev_queue->last_seen_udev_seqnum) {
191 udev_queue_get_udev_seqnum(udev_queue);
192 if (seqnum < udev_queue->last_seen_udev_seqnum)
195 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
196 udev_get_dev_path(udev_queue->udev), seqnum);
197 if (stat(filename, &statbuf) == 0)
199 dbg(udev_queue->udev, "seqnum: %llu finished\n", seqnum);
203 struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
205 char path[UTIL_PATH_SIZE];
209 if (udev_queue == NULL)
211 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
212 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
213 util_strlcat(path, "/.udev/queue", sizeof(path));
217 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
218 char filename[UTIL_PATH_SIZE];
219 char syspath[UTIL_PATH_SIZE];
223 if (dent->d_name[0] == '.')
225 util_strlcpy(filename, path, sizeof(filename));
226 util_strlcat(filename, "/", sizeof(filename));
227 util_strlcat(filename, dent->d_name, sizeof(filename));
229 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
230 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
231 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
233 syspath[syslen + len] = '\0';
234 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
235 udev_list_entry_add(udev_queue->udev, &udev_queue->queue_list, syspath, dent->d_name, 0, 0);
238 return udev_list_get_entry(&udev_queue->queue_list);
241 struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
243 char path[UTIL_PATH_SIZE];
247 if (udev_queue == NULL)
249 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
250 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
251 util_strlcat(path, "/.udev/failed", sizeof(path));
255 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
256 char filename[UTIL_PATH_SIZE];
257 char syspath[UTIL_PATH_SIZE];
262 if (dent->d_name[0] == '.')
264 util_strlcpy(filename, path, sizeof(filename));
265 util_strlcat(filename, "/", sizeof(filename));
266 util_strlcat(filename, dent->d_name, sizeof(filename));
268 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
269 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
270 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
272 syspath[syslen + len] = '\0';
273 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
274 util_strlcpy(filename, syspath, sizeof(filename));
275 util_strlcat(filename, "/uevent", sizeof(filename));
276 if (stat(filename, &statbuf) != 0)
278 udev_list_entry_add(udev_queue->udev, &udev_queue->failed_list, syspath, NULL, 0, 0);
281 return udev_list_get_entry(&udev_queue->failed_list);
284 int udev_queue_export_udev_seqnum(struct udev_queue *udev_queue, unsigned long long int seqnum)
289 extern int udev_queue_export_device_queued(struct udev_queue *udev_queue, struct udev_device *udev_device)
294 extern int udev_queue_export_device_finished(struct udev_queue *udev_queue, struct udev_device *udev_device)
299 extern int udev_queue_export_device_failed(struct udev_queue *udev_queue, struct udev_device *udev_device)