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 = malloc(sizeof(struct udev_queue));
49 if (udev_queue == NULL)
51 memset(udev_queue, 0x00, sizeof(struct udev_queue));
52 udev_queue->refcount = 1;
53 udev_queue->udev = udev;
54 udev_list_init(&udev_queue->queue_list);
55 udev_list_init(&udev_queue->failed_list);
59 struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
61 if (udev_queue == NULL)
63 udev_queue->refcount++;
67 void udev_queue_unref(struct udev_queue *udev_queue)
69 if (udev_queue == NULL)
71 udev_queue->refcount--;
72 if (udev_queue->refcount > 0)
74 udev_list_cleanup(udev_queue->udev, &udev_queue->queue_list);
75 udev_list_cleanup(udev_queue->udev, &udev_queue->failed_list);
79 struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
81 if (udev_queue == NULL)
83 return udev_queue->udev;
86 unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
88 char filename[UTIL_PATH_SIZE];
89 unsigned long long int seqnum;
94 if (udev_queue == NULL)
96 util_strlcpy(filename, udev_get_sys_path(udev_queue->udev), sizeof(filename));
97 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
98 fd = open(filename, O_RDONLY);
101 len = read(fd, buf, sizeof(buf));
106 seqnum = strtoull(buf, NULL, 10);
107 info(udev_queue->udev, "seqnum=%llu\n", seqnum);
111 unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
113 char filename[UTIL_PATH_SIZE];
114 unsigned long long int seqnum;
119 if (udev_queue == NULL)
121 util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
122 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
123 fd = open(filename, O_RDONLY);
126 len = read(fd, buf, sizeof(buf));
131 seqnum = strtoull(buf, NULL, 10);
132 info(udev_queue->udev, "seqnum=%llu\n", seqnum);
133 udev_queue->last_seen_udev_seqnum = seqnum;
137 int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
139 char queuename[UTIL_PATH_SIZE];
141 unsigned long long int seqnum_kernel;
143 if (udev_queue == NULL)
145 util_strlcpy(queuename, udev_get_dev_path(udev_queue->udev), sizeof(queuename));
146 util_strlcat(queuename, "/.udev/queue", sizeof(queuename));
147 if (stat(queuename, &statbuf) == 0) {
148 info(udev_queue->udev, "queue is not empty\n");
151 seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
152 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
153 info(udev_queue->udev, "queue is empty\n");
156 udev_queue_get_udev_seqnum(udev_queue);
157 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
158 info(udev_queue->udev, "queue is empty\n");
161 info(udev_queue->udev, "queue is empty, but kernel events still pending [%llu]<->[%llu]\n",
162 seqnum_kernel, udev_queue->last_seen_udev_seqnum);
166 int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
168 char filename[UTIL_PATH_SIZE];
171 if (udev_queue == NULL)
173 /* if we have not seen this seqnum, check if it is/was already queued */
174 if (seqnum < udev_queue->last_seen_udev_seqnum) {
175 udev_queue_get_udev_seqnum(udev_queue);
176 if (seqnum < udev_queue->last_seen_udev_seqnum)
179 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
180 udev_get_dev_path(udev_queue->udev), seqnum);
181 if (stat(filename, &statbuf) == 0)
183 info(udev_queue->udev, "seqnum: %llu finished\n", seqnum);
187 struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
189 char path[UTIL_PATH_SIZE];
193 if (udev_queue == NULL)
195 udev_list_cleanup(udev_queue->udev, &udev_queue->queue_list);
196 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
197 util_strlcat(path, "/.udev/queue", sizeof(path));
201 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
202 char filename[UTIL_PATH_SIZE];
203 char syspath[UTIL_PATH_SIZE];
207 if (dent->d_name[0] == '.')
209 util_strlcpy(filename, path, sizeof(filename));
210 util_strlcat(filename, "/", sizeof(filename));
211 util_strlcat(filename, dent->d_name, sizeof(filename));
213 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
214 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
215 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
217 syspath[syslen + len] = '\0';
218 info(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
219 udev_list_entry_add(udev_queue->udev, &udev_queue->queue_list, syspath, dent->d_name, 0, 0);
222 return udev_list_get_entry(&udev_queue->queue_list);
225 struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
227 char path[UTIL_PATH_SIZE];
231 if (udev_queue == NULL)
233 udev_list_cleanup(udev_queue->udev, &udev_queue->failed_list);
234 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
235 util_strlcat(path, "/.udev/failed", sizeof(path));
239 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
240 char filename[UTIL_PATH_SIZE];
241 char syspath[UTIL_PATH_SIZE];
246 if (dent->d_name[0] == '.')
248 util_strlcpy(filename, path, sizeof(filename));
249 util_strlcat(filename, "/", sizeof(filename));
250 util_strlcat(filename, dent->d_name, sizeof(filename));
252 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
253 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
254 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
256 syspath[syslen + len] = '\0';
257 info(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
258 util_strlcpy(filename, syspath, sizeof(filename));
259 util_strlcat(filename, "/uevent", sizeof(filename));
260 if (stat(filename, &statbuf) != 0)
262 udev_list_entry_add(udev_queue->udev, &udev_queue->failed_list, syspath, NULL, 0, 0);
265 return udev_list_get_entry(&udev_queue->failed_list);
268 int udev_queue_export_udev_seqnum(struct udev_queue *udev_queue, unsigned long long int seqnum)
273 extern int udev_queue_export_device_queued(struct udev_queue *udev_queue, struct udev_device *udev_device)
278 extern int udev_queue_export_device_finished(struct udev_queue *udev_queue, struct udev_device *udev_device)
283 extern int udev_queue_export_device_failed(struct udev_queue *udev_queue, struct udev_device *udev_device)