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_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev_queue->udev), "/kernel/uevent_seqnum", NULL);
88 fd = open(filename, O_RDONLY);
91 len = read(fd, buf, sizeof(buf));
96 seqnum = strtoull(buf, NULL, 10);
97 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
101 unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
103 char filename[UTIL_PATH_SIZE];
104 unsigned long long int seqnum;
109 if (udev_queue == NULL)
111 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_queue->udev), "/.udev/uevent_seqnum", NULL);
112 fd = open(filename, O_RDONLY);
115 len = read(fd, buf, sizeof(buf));
120 seqnum = strtoull(buf, NULL, 10);
121 dbg(udev_queue->udev, "seqnum=%llu\n", seqnum);
122 udev_queue->last_seen_udev_seqnum = seqnum;
126 int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
128 char filename[UTIL_PATH_SIZE];
131 if (udev_queue == NULL)
133 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_queue->udev), "/.udev/uevent_seqnum", NULL);
134 if (stat(filename, &statbuf) == 0)
139 int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
141 char queuename[UTIL_PATH_SIZE];
143 unsigned long long int seqnum_kernel;
145 if (udev_queue == NULL)
147 util_strscpyl(queuename, sizeof(queuename), udev_get_dev_path(udev_queue->udev), "/.udev/queue", NULL);
148 if (stat(queuename, &statbuf) == 0) {
149 dbg(udev_queue->udev, "queue is not empty\n");
152 seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
153 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
154 dbg(udev_queue->udev, "queue is empty\n");
157 /* update udev seqnum, and check if udev is still running */
158 if (udev_queue_get_udev_seqnum(udev_queue) == 0)
159 if (!udev_queue_get_udev_is_active(udev_queue))
161 if (seqnum_kernel <= udev_queue->last_seen_udev_seqnum) {
162 dbg(udev_queue->udev, "queue is empty\n");
165 dbg(udev_queue->udev, "queue is empty, but kernel events still pending [%llu]<->[%llu]\n",
166 seqnum_kernel, udev_queue->last_seen_udev_seqnum);
170 int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
172 char filename[UTIL_PATH_SIZE];
175 if (udev_queue == NULL)
177 /* did it reach the queue? */
178 if (seqnum > udev_queue->last_seen_udev_seqnum)
179 if (seqnum > udev_queue_get_udev_seqnum(udev_queue))
181 /* is it still in the queue? */
182 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
183 udev_get_dev_path(udev_queue->udev), seqnum);
184 if (lstat(filename, &statbuf) == 0)
186 dbg(udev_queue->udev, "seqnum: %llu finished\n", seqnum);
190 struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
192 char path[UTIL_PATH_SIZE];
196 if (udev_queue == NULL)
198 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->queue_list);
199 util_strscpyl(path, sizeof(path), udev_get_dev_path(udev_queue->udev), "/.udev/queue", NULL);
203 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
204 char syspath[UTIL_PATH_SIZE];
209 if (dent->d_name[0] == '.')
212 l = util_strpcpyl(&s, sizeof(syspath), udev_get_sys_path(udev_queue->udev), NULL);
213 len = readlinkat(dirfd(dir), dent->d_name, s, l);
214 if (len < 0 || (size_t)len >= l)
217 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
218 udev_list_entry_add(udev_queue->udev, &udev_queue->queue_list, syspath, dent->d_name, 0, 0);
221 return udev_list_get_entry(&udev_queue->queue_list);
224 struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
226 char path[UTIL_PATH_SIZE];
230 if (udev_queue == NULL)
232 udev_list_cleanup_entries(udev_queue->udev, &udev_queue->failed_list);
233 util_strscpyl(path, sizeof(path), udev_get_dev_path(udev_queue->udev), "/.udev/failed", NULL);
237 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
238 char filename[UTIL_PATH_SIZE];
239 char syspath[UTIL_PATH_SIZE];
245 if (dent->d_name[0] == '.')
248 l = util_strpcpyl(&s, sizeof(syspath), udev_get_sys_path(udev_queue->udev), NULL);
249 len = readlinkat(dirfd(dir), dent->d_name, s, l);
250 if (len < 0 || (size_t)len >= l)
253 dbg(udev_queue->udev, "found '%s' [%s]\n", syspath, dent->d_name);
254 util_strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
255 if (stat(filename, &statbuf) != 0)
257 udev_list_entry_add(udev_queue->udev, &udev_queue->failed_list, syspath, NULL, 0, 0);
260 return udev_list_get_entry(&udev_queue->failed_list);
263 int udev_queue_export_udev_seqnum(struct udev_queue *udev_queue, unsigned long long int seqnum)
268 int udev_queue_export_device_queued(struct udev_queue *udev_queue, struct udev_device *udev_device)
273 int udev_queue_export_device_finished(struct udev_queue *udev_queue, struct udev_device *udev_device)
278 int udev_queue_export_device_failed(struct udev_queue *udev_queue, struct udev_device *udev_device)