2 * libudev - interface to udev device information
4 * Copyright (C) 2008 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"
28 unsigned long long int last_seen_udev_seqnum;
29 struct udev_list_node queue_list;
30 struct udev_list_node failed_list;
33 struct udev_queue *udev_queue_new(struct udev *udev)
35 struct udev_queue *udev_queue;
40 udev_queue = calloc(1, sizeof(struct udev_queue));
41 if (udev_queue == NULL)
43 udev_queue->refcount = 1;
44 udev_queue->udev = udev;
45 udev_list_init(&udev_queue->queue_list);
46 udev_list_init(&udev_queue->failed_list);
50 struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
52 if (udev_queue == NULL)
54 udev_queue->refcount++;
58 void udev_queue_unref(struct udev_queue *udev_queue)
60 if (udev_queue == NULL)
62 udev_queue->refcount--;
63 if (udev_queue->refcount > 0)
65 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
66 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
70 struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
72 if (udev_queue == NULL)
74 return udev_queue->udev;
77 unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
79 char filename[UTIL_PATH_SIZE];
80 unsigned long long int seqnum;
85 if (udev_queue == NULL)
87 util_strlcpy(filename, udev_get_sys_path(udev_queue->udev), sizeof(filename));
88 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
89 fd = open(filename, O_RDONLY);
92 len = read(fd, buf, sizeof(buf));
97 seqnum = strtoull(buf, NULL, 10);
98 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
102 unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
104 char filename[UTIL_PATH_SIZE];
105 unsigned long long int seqnum;
110 if (udev_queue == NULL)
112 util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
113 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
114 fd = open(filename, O_RDONLY);
117 len = read(fd, buf, sizeof(buf));
122 seqnum = strtoull(buf, NULL, 10);
123 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
124 udev_queue->last_seen_udev_seqnum = seqnum;
128 int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
130 char filename[UTIL_PATH_SIZE];
133 if (udev_queue == NULL)
135 util_strlcpy(filename, udev_get_dev_path(udev_queue->udev), sizeof(filename));
136 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
137 if (stat(filename, &statbuf) == 0)
142 int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
144 char queuename[UTIL_PATH_SIZE];
146 unsigned long long int seqnum_kernel;
148 if (udev_queue == NULL)
150 util_strlcpy(queuename, udev_get_dev_path(udev_queue->udev), sizeof(queuename));
151 util_strlcat(queuename, "/.udev/queue", sizeof(queuename));
152 if (stat(queuename, &statbuf) == 0) {
153 dbg(udev_queue->udev, "queue is not empty\n");
156 seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
157 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
158 dbg(udev_queue->udev, "queue is empty\n");
161 /* update udev seqnum, and check if udev is still running */
162 if (udev_queue_get_udev_seqnum(udev_queue) == 0)
163 if (!udev_queue_get_udev_is_active(udev_queue))
165 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
166 dbg(udev_queue->udev, "queue is empty\n");
169 dbg(udev_queue->udev, "queue is empty, but kernel events still pending [%llu]<->[%llu]\n",
170 seqnum_kernel, udev_queue->last_seen_udev_seqnum);
174 int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
176 char filename[UTIL_PATH_SIZE];
179 if (udev_queue == NULL)
181 /* did it reach the queue? */
182 if (seqnum > udev_queue->last_seen_udev_seqnum)
183 if (seqnum > udev_queue_get_udev_seqnum(udev_queue))
185 /* is it still in the queue? */
186 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
187 udev_get_dev_path(udev_queue->udev), seqnum);
188 if (lstat(filename, &statbuf) == 0)
190 dbg(udev_queue->udev, "seqnum: %llu finished\n", seqnum);
194 struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
196 char path[UTIL_PATH_SIZE];
200 if (udev_queue == NULL)
202 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
203 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
204 util_strlcat(path, "/.udev/queue", sizeof(path));
208 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
209 char filename[UTIL_PATH_SIZE];
210 char syspath[UTIL_PATH_SIZE];
214 if (dent->d_name[0] == '.')
216 util_strlcpy(filename, path, sizeof(filename));
217 util_strlcat(filename, "/", sizeof(filename));
218 util_strlcat(filename, dent->d_name, sizeof(filename));
220 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
221 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
222 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
224 syspath[syslen + len] = '\0';
225 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
226 udev_list_entry_add(udev_queue->udev, &udev_queue->queue_list, syspath, dent->d_name, 0, 0);
229 return udev_list_get_entry(&udev_queue->queue_list);
232 struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
234 char path[UTIL_PATH_SIZE];
238 if (udev_queue == NULL)
240 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
241 util_strlcpy(path, udev_get_dev_path(udev_queue->udev), sizeof(path));
242 util_strlcat(path, "/.udev/failed", sizeof(path));
246 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
247 char filename[UTIL_PATH_SIZE];
248 char syspath[UTIL_PATH_SIZE];
253 if (dent->d_name[0] == '.')
255 util_strlcpy(filename, path, sizeof(filename));
256 util_strlcat(filename, "/", sizeof(filename));
257 util_strlcat(filename, dent->d_name, sizeof(filename));
259 syslen = util_strlcpy(syspath, udev_get_sys_path(udev_queue->udev), sizeof(syspath));
260 len = readlink(filename, &syspath[syslen], sizeof(syspath)-syslen);
261 if (len < 0 || len >= (ssize_t)(sizeof(syspath)-syslen))
263 syspath[syslen + len] = '\0';
264 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
265 util_strlcpy(filename, syspath, sizeof(filename));
266 util_strlcat(filename, "/uevent", sizeof(filename));
267 if (stat(filename, &statbuf) != 0)
269 udev_list_entry_add(udev_queue->udev, &udev_queue->failed_list, syspath, NULL, 0, 0);
272 return udev_list_get_entry(&udev_queue->failed_list);
275 int udev_queue_export_udev_seqnum(struct udev_queue *udev_queue, unsigned long long int seqnum)
280 int udev_queue_export_device_queued(struct udev_queue *udev_queue, struct udev_device *udev_device)
285 int udev_queue_export_device_finished(struct udev_queue *udev_queue, struct udev_device *udev_device)
290 int udev_queue_export_device_failed(struct udev_queue *udev_queue, struct udev_device *udev_device)