udev/lib/libudev-device.c

   1 /*
   2  * libudev - interface to udev device information
   3  *
   4  * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   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.
  10  *
  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.
  15  *
  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/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <dirent.h>
  27 #include <fcntl.h>
  28 #include <ctype.h>
  29 #include <sys/stat.h>
  30
  31 #include "libudev.h"
  32 #include "libudev-private.h"
  33
  34 struct udev_device {
  35         struct udev *udev;
  36         struct udev_device *parent_device;
  37         char *syspath;
  38         const char *devpath;
  39         char *sysname;
  40         const char *sysnum;
  41         char *devnode;
  42         char *subsystem;
  43         char *devtype;
  44         char *driver;
  45         char *action;
  46         char *devpath_old;
  47         char *physdevpath;
  48         char **envp;
  49         char *monitor_buf;
  50         size_t monitor_buf_len;
  51         struct udev_list_node devlinks_list;
  52         struct udev_list_node properties_list;
  53         struct udev_list_node sysattr_list;
  54         unsigned long long int seqnum;
  55         int event_timeout;
  56         int timeout;
  57         int num_fake_partitions;
  58         int devlink_priority;
  59         int refcount;
  60         dev_t devnum;
  61         unsigned int parent_set:1;
  62         unsigned int subsystem_set:1;
  63         unsigned int devtype_set:1;
  64         unsigned int devlinks_uptodate:1;
  65         unsigned int envp_uptodate:1;
  66         unsigned int driver_set:1;
  67         unsigned int info_loaded:1;
  68         unsigned int ignore_remove:1;
  69 };
  70
  71 static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
  72 {
  73         size_t start;
  74
  75         /* translate to location of db file */
  76         util_strlcpy(filename, udev_get_dev_path(udev), len);
  77         start = util_strlcat(filename, "/.udev/db/", len);
  78         util_strlcat(filename, devpath, len);
  79         return util_path_encode(&filename[start], len - start);
  80 }
  81
  82 int udev_device_read_db(struct udev_device *udev_device)
  83 {
  84         struct stat stats;
  85         char filename[UTIL_PATH_SIZE];
  86         char line[UTIL_LINE_SIZE];
  87         FILE *f;
  88
  89         devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename));
  90
  91         if (lstat(filename, &stats) != 0) {
  92                 dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
  93                 return -1;
  94         }
  95         if ((stats.st_mode & S_IFMT) == S_IFLNK) {
  96                 char target[UTIL_PATH_SIZE];
  97                 char devnode[UTIL_PATH_SIZE];
  98                 int target_len;
  99                 char *next;
 100
 101                 target_len = readlink(filename, target, sizeof(target));
 102                 if (target_len > 0)
 103                         target[target_len] = '\0';
 104                 else {
 105                         dbg(udev_device->udev, "error reading db link %s: %m\n", filename);
 106                         return -1;
 107                 }
 108
 109                 next = strchr(target, ' ');
 110                 if (next != NULL) {
 111                         next[0] = '\0';
 112                         next = &next[1];
 113                 }
 114                 util_strlcpy(devnode, udev_get_dev_path(udev_device->udev), sizeof(devnode));
 115                 util_strlcat(devnode, "/", sizeof(devnode));
 116                 util_strlcat(devnode, target, sizeof(devnode));
 117                 udev_device_set_devnode(udev_device, devnode);
 118                 while (next != NULL) {
 119                         char devlink[UTIL_PATH_SIZE];
 120                         const char *lnk;
 121
 122                         lnk = next;
 123                         next = strchr(next, ' ');
 124                         if (next != NULL) {
 125                                 next[0] = '\0';
 126                                 next = &next[1];
 127                         }
 128                         util_strlcpy(devlink, udev_get_dev_path(udev_device->udev), sizeof(devlink));
 129                         util_strlcat(devlink, "/", sizeof(devlink));
 130                         util_strlcat(devlink, lnk, sizeof(devlink));
 131                         udev_device_add_devlink(udev_device, devlink);
 132                 }
 133                 info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
 134                 return 0;
 135         }
 136
 137         f = fopen(filename, "r");
 138         if (f == NULL) {
 139                 dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
 140                 return -1;
 141         }
 142         while (fgets(line, sizeof(line), f)) {
 143                 ssize_t len;
 144                 const char *val;
 145
 146                 len = strlen(line);
 147                 if (len < 4)
 148                         break;
 149                 line[len-1] = '\0';
 150                 val = &line[2];
 151                 switch(line[0]) {
 152                 case 'N':
 153                         util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
 154                         util_strlcat(filename, "/", sizeof(filename));
 155                         util_strlcat(filename, val, sizeof(filename));
 156                         udev_device_set_devnode(udev_device, filename);
 157                         break;
 158                 case 'S':
 159                         util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
 160                         util_strlcat(filename, "/", sizeof(filename));
 161                         util_strlcat(filename, val, sizeof(filename));
 162                         udev_device_add_devlink(udev_device, filename);
 163                         break;
 164                 case 'L':
 165                         udev_device_set_devlink_priority(udev_device, atoi(val));
 166                         break;
 167                 case 'T':
 168                         udev_device_set_event_timeout(udev_device, atoi(val));
 169                         break;
 170                 case 'A':
 171                         udev_device_set_num_fake_partitions(udev_device, atoi(val));
 172                         break;
 173                 case 'R':
 174                         udev_device_set_ignore_remove(udev_device, atoi(val));
 175                         break;
 176                 case 'E':
 177                         udev_device_add_property_from_string(udev_device, val);
 178                         break;
 179                 }
 180         }
 181         fclose(f);
 182
 183         info(udev_device->udev, "device %p filled with db file data\n", udev_device);
 184         return 0;
 185 }
 186
 187 int udev_device_read_uevent_file(struct udev_device *udev_device)
 188 {
 189         char filename[UTIL_PATH_SIZE];
 190         FILE *f;
 191         char line[UTIL_LINE_SIZE];
 192         int maj = 0;
 193         int min = 0;
 194
 195         util_strlcpy(filename, udev_device->syspath, sizeof(filename));
 196         util_strlcat(filename, "/uevent", sizeof(filename));
 197         f = fopen(filename, "r");
 198         if (f == NULL)
 199                 return -1;
 200
 201         while (fgets(line, sizeof(line), f)) {
 202                 char *pos;
 203
 204                 pos = strchr(line, '\n');
 205                 if (pos == NULL)
 206                         continue;
 207                 pos[0] = '\0';
 208
 209                 if (strncmp(line, "DEVTYPE=", 8) == 0)
 210                         udev_device_set_devtype(udev_device, &line[8]);
 211                 else if (strncmp(line, "MAJOR=", 6) == 0)
 212                         maj = strtoull(&line[6], NULL, 10);
 213                 else if (strncmp(line, "MINOR=", 6) == 0)
 214                         min = strtoull(&line[6], NULL, 10);
 215
 216                 udev_device_add_property_from_string(udev_device, line);
 217         }
 218
 219         udev_device->devnum = makedev(maj, min);
 220
 221         fclose(f);
 222         return 0;
 223 }
 224
 225 static void device_load_info(struct udev_device *device)
 226 {
 227         device->info_loaded = 1;
 228         udev_device_read_uevent_file(device);
 229         udev_device_read_db(device);
 230 }
 231
 232 void udev_device_set_info_loaded(struct udev_device *device)
 233 {
 234         device->info_loaded = 1;
 235 }
 236
 237 struct udev_device *device_new(struct udev *udev)
 238 {
 239         struct udev_device *udev_device;
 240         struct udev_list_entry *list_entry;
 241
 242         if (udev == NULL)
 243                 return NULL;
 244
 245         udev_device = calloc(1, sizeof(struct udev_device));
 246         if (udev_device == NULL)
 247                 return NULL;
 248         udev_device->refcount = 1;
 249         udev_device->udev = udev;
 250         udev_list_init(&udev_device->devlinks_list);
 251         udev_list_init(&udev_device->properties_list);
 252         udev_list_init(&udev_device->sysattr_list);
 253         udev_device->event_timeout = -1;
 254         /* copy global properties */
 255         udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
 256                 udev_device_add_property(udev_device,
 257                                          udev_list_entry_get_name(list_entry),
 258                                          udev_list_entry_get_value(list_entry));
 259         dbg(udev_device->udev, "udev_device: %p created\n", udev_device);
 260         return udev_device;
 261 }
 262
 263 /**
 264  * udev_device_new_from_syspath:
 265  * @udev: udev library context
 266  * @syspath: sys device path including sys directory
 267  *
 268  * Create new udev device, and fill in information from the sys
 269  * device and the udev database entry. The sypath is the absolute
 270  * path to the device, including the sys mount point.
 271  *
 272  * The initial refcount is 1, and needs to be decremented to
 273  * release the resources of the udev device.
 274  *
 275  * Returns: a new udev device, or #NULL, if it does not exist
 276  **/
 277 struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 278 {
 279         size_t len;
 280         const char *subdir;
 281         char path[UTIL_PATH_SIZE];
 282         char *pos;
 283         struct stat statbuf;
 284         struct udev_device *udev_device;
 285
 286         if (udev == NULL)
 287                 return NULL;
 288         if (syspath == NULL)
 289                 return NULL;
 290
 291         /* path starts in sys */
 292         len = strlen(udev_get_sys_path(udev));
 293         if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
 294                 info(udev, "not in sys :%s\n", syspath);
 295                 return NULL;
 296         }
 297
 298         /* path is not a root directory */
 299         subdir = &syspath[len+1];
 300         pos = strrchr(subdir, '/');
 301         if (pos == NULL || pos < &subdir[2]) {
 302                 dbg(udev, "not a subdir :%s\n", syspath);
 303                 return NULL;
 304         }
 305
 306         /* resolve possible symlink to real path */
 307         util_strlcpy(path, syspath, sizeof(path));
 308         util_resolve_sys_link(udev, path, sizeof(path));
 309
 310         /* try to resolve the silly block layout if needed */
 311         if (strncmp(&path[len], "/block/", 7) == 0) {
 312                 char block[UTIL_PATH_SIZE];
 313                 char part[UTIL_PATH_SIZE];
 314
 315                 util_strlcpy(block, path, sizeof(block));
 316                 pos = strrchr(block, '/');
 317                 if (pos == NULL)
 318                         return NULL;
 319                 util_strlcpy(part, pos, sizeof(part));
 320                 pos[0] = '\0';
 321                 if (util_resolve_sys_link(udev, block, sizeof(block)) == 0) {
 322                         util_strlcpy(path, block, sizeof(path));
 323                         util_strlcat(path, part, sizeof(path));
 324                 }
 325         }
 326
 327         /* path exists in sys */
 328         if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
 329             strncmp(&syspath[len], "/class/", 7) == 0 ||
 330             strncmp(&syspath[len], "/block/", 7) == 0) {
 331                 char file[UTIL_PATH_SIZE];
 332
 333                 /* all "devices" require a "uevent" file */
 334                 util_strlcpy(file, path, sizeof(file));
 335                 util_strlcat(file, "/uevent", sizeof(file));
 336                 if (stat(file, &statbuf) != 0) {
 337                         dbg(udev, "not a device: %s\n", syspath);
 338                         return NULL;
 339                 }
 340         } else {
 341                 /* everything else just needs to be a directory */
 342                 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
 343                         dbg(udev, "directory not found: %s\n", syspath);
 344                         return NULL;
 345                 }
 346         }
 347
 348         udev_device = device_new(udev);
 349         if (udev_device == NULL)
 350                 return NULL;
 351
 352         udev_device_set_syspath(udev_device, path);
 353         info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 354
 355         return udev_device;
 356 }
 357
 358 struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
 359 {
 360         char path[UTIL_PATH_SIZE];
 361         const char *type_str;
 362         struct udev_enumerate *udev_enumerate;
 363         struct udev_list_entry *list_entry;
 364         struct udev_device *device = NULL;
 365
 366         if (type == 'b')
 367                 type_str = "block";
 368         else if (type == 'c')
 369                 type_str = "char";
 370         else
 371                 return NULL;
 372
 373         /* /sys/dev/{block,char}/<maj>:<min> link */
 374         snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev),
 375                  type_str, major(devnum), minor(devnum));
 376         if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
 377                 return udev_device_new_from_syspath(udev, path);
 378
 379         udev_enumerate = udev_enumerate_new(udev);
 380         if (udev_enumerate == NULL)
 381                 return NULL;
 382
 383         /* fallback to search sys devices for the major/minor */
 384         if (type == 'b')
 385                 udev_enumerate_add_match_subsystem(udev_enumerate, "block");
 386         else if (type == 'c')
 387                 udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
 388         udev_enumerate_scan_devices(udev_enumerate);
 389         udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
 390                 struct udev_device *device_loop;
 391
 392                 device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
 393                 if (device_loop != NULL) {
 394                         if (udev_device_get_devnum(device_loop) == devnum) {
 395                                 if (type == 'b' && strcmp(udev_device_get_subsystem(device_loop), "block") != 0)
 396                                         continue;
 397                                 if (type == 'c' && strcmp(udev_device_get_subsystem(device_loop), "block") == 0)
 398                                         continue;
 399                                 device = device_loop;
 400                                 break;
 401                         }
 402                         udev_device_unref(device_loop);
 403                 }
 404         }
 405         udev_enumerate_unref(udev_enumerate);
 406         return device;
 407 }
 408
 409 struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 410 {
 411         size_t sys_path_len;
 412         char path_full[UTIL_PATH_SIZE];
 413         char *path;
 414         struct stat statbuf;
 415
 416         sys_path_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full));
 417         path = &path_full[sys_path_len];
 418
 419         if (strcmp(subsystem, "subsystem") == 0) {
 420                 util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
 421                 util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 422                 if (stat(path_full, &statbuf) == 0)
 423                         goto found;
 424
 425                 util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
 426                 util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 427                 if (stat(path_full, &statbuf) == 0)
 428                         goto found;
 429
 430                 util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
 431                 util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 432                 if (stat(path_full, &statbuf) == 0)
 433                         goto found;
 434                 goto out;
 435         }
 436
 437         if (strcmp(subsystem, "module") == 0) {
 438                 util_strlcpy(path, "/module/", sizeof(path_full) - sys_path_len);
 439                 util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 440                 if (stat(path_full, &statbuf) == 0)
 441                         goto found;
 442                 goto out;
 443         }
 444
 445         if (strcmp(subsystem, "drivers") == 0) {
 446                 char subsys[UTIL_NAME_SIZE];
 447                 char *driver;
 448
 449                 util_strlcpy(subsys, sysname, sizeof(subsys));
 450                 driver = strchr(subsys, ':');
 451                 if (driver != NULL) {
 452                         driver[0] = '\0';
 453                         driver = &driver[1];
 454                         util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
 455                         util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
 456                         util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
 457                         util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
 458                         if (stat(path_full, &statbuf) == 0)
 459                                 goto found;
 460
 461                         util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
 462                         util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
 463                         util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
 464                         util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
 465                         if (stat(path_full, &statbuf) == 0)
 466                                 goto found;
 467                 }
 468                 goto out;
 469         }
 470
 471         util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
 472         util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
 473         util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
 474         util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 475         if (stat(path_full, &statbuf) == 0)
 476                 goto found;
 477
 478         util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
 479         util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
 480         util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
 481         util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 482         if (stat(path_full, &statbuf) == 0)
 483                 goto found;
 484
 485         util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
 486         util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
 487         util_strlcat(path, "/", sizeof(path_full) - sys_path_len);
 488         util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
 489         if (stat(path_full, &statbuf) == 0)
 490                 goto found;
 491 out:
 492         return NULL;
 493 found:
 494         return udev_device_new_from_syspath(udev, path_full);
 495 }
 496
 497 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
 498 {
 499         struct udev_device *udev_device_parent = NULL;
 500         char path[UTIL_PATH_SIZE];
 501         const char *subdir;
 502
 503         /* follow "device" link in deprecated sys layout */
 504         if (strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 505             strncmp(udev_device->devpath, "/block/", 7) == 0) {
 506                 util_strlcpy(path, udev_device->syspath, sizeof(path));
 507                 util_strlcat(path, "/device", sizeof(path));
 508                 if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) {
 509                         udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 510                         if (udev_device_parent != NULL)
 511                                 return udev_device_parent;
 512                 }
 513         }
 514
 515         util_strlcpy(path, udev_device->syspath, sizeof(path));
 516         subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
 517         while (1) {
 518                 char *pos;
 519
 520                 pos = strrchr(subdir, '/');
 521                 if (pos == NULL || pos < &subdir[2])
 522                         break;
 523                 pos[0] = '\0';
 524                 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 525                 if (udev_device_parent != NULL)
 526                         return udev_device_parent;
 527         }
 528         return NULL;
 529 }
 530
 531 struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 532 {
 533         if (udev_device == NULL)
 534                 return NULL;
 535         if (!udev_device->parent_set) {
 536                 udev_device->parent_set = 1;
 537                 udev_device->parent_device = device_new_from_parent(udev_device);
 538         }
 539         if (udev_device->parent_device != NULL)
 540                 dbg(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
 541         return udev_device->parent_device;
 542 }
 543
 544 struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
 545 {
 546         struct udev_device *parent;
 547
 548         if (subsystem == NULL)
 549                 return NULL;
 550
 551         parent = udev_device_get_parent(udev_device);
 552         while (parent != NULL) {
 553                 const char *parent_subsystem;
 554                 const char *parent_devtype;
 555
 556                 parent_subsystem = udev_device_get_subsystem(parent);
 557                 if (parent_subsystem != NULL && strcmp(parent_subsystem, subsystem) == 0) {
 558                         if (devtype == NULL)
 559                                 break;
 560                         parent_devtype = udev_device_get_devtype(parent);
 561                         if (parent_devtype != NULL && strcmp(parent_devtype, devtype) == 0)
 562                                 break;
 563                 }
 564                 parent = udev_device_get_parent(parent);
 565         }
 566         return parent;
 567 }
 568
 569 /**
 570  * udev_device_get_udev:
 571  * @udev_device: udev device
 572  *
 573  * Retrieve the udev library context the device was created with.
 574  *
 575  * Returns: the udev library context
 576  **/
 577 struct udev *udev_device_get_udev(struct udev_device *udev_device)
 578 {
 579         if (udev_device == NULL)
 580                 return NULL;
 581         return udev_device->udev;
 582 }
 583
 584 /**
 585  * udev_device_ref:
 586  * @udev_device: udev device
 587  *
 588  * Take a reference of a udev device.
 589  *
 590  * Returns: the passed udev device
 591  **/
 592 struct udev_device *udev_device_ref(struct udev_device *udev_device)
 593 {
 594         if (udev_device == NULL)
 595                 return NULL;
 596         udev_device->refcount++;
 597         return udev_device;
 598 }
 599
 600 /**
 601  * udev_device_unref:
 602  * @udev_device: udev device
 603  *
 604  * Drop a reference of a udev device. If the refcount reaches zero,
 605  * the resources of the device will be released.
 606  *
 607  **/
 608 void udev_device_unref(struct udev_device *udev_device)
 609 {
 610         if (udev_device == NULL)
 611                 return;
 612         udev_device->refcount--;
 613         if (udev_device->refcount > 0)
 614                 return;
 615         if (udev_device->parent_device != NULL)
 616                 udev_device_unref(udev_device->parent_device);
 617         free(udev_device->syspath);
 618         free(udev_device->sysname);
 619         free(udev_device->devnode);
 620         free(udev_device->subsystem);
 621         free(udev_device->devtype);
 622         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 623         udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
 624         free(udev_device->action);
 625         free(udev_device->driver);
 626         free(udev_device->devpath_old);
 627         free(udev_device->physdevpath);
 628         udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
 629         free(udev_device->envp);
 630         free(udev_device->monitor_buf);
 631         dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
 632         free(udev_device);
 633 }
 634
 635 /**
 636  * udev_device_get_devpath:
 637  * @udev_device: udev device
 638  *
 639  * Retrieve the kernel devpath value of the udev device. The path
 640  * does not contain the sys mount point, and starts with a '/'.
 641  *
 642  * Returns: the devpath of the udev device
 643  **/
 644 const char *udev_device_get_devpath(struct udev_device *udev_device)
 645 {
 646         if (udev_device == NULL)
 647                 return NULL;
 648         return udev_device->devpath;
 649 }
 650
 651 /**
 652  * udev_device_get_syspath:
 653  * @udev_device: udev device
 654  *
 655  * Retrieve the sys path of the udev device. The path is an
 656  * absolute path and starts with the sys mount point.
 657  *
 658  * Returns: the sys path of the udev device
 659  **/
 660 const char *udev_device_get_syspath(struct udev_device *udev_device)
 661 {
 662         if (udev_device == NULL)
 663                 return NULL;
 664         return udev_device->syspath;
 665 }
 666
 667 const char *udev_device_get_sysname(struct udev_device *udev_device)
 668 {
 669         if (udev_device == NULL)
 670                 return NULL;
 671         return udev_device->sysname;
 672 }
 673
 674 const char *udev_device_get_sysnum(struct udev_device *udev_device)
 675 {
 676         if (udev_device == NULL)
 677                 return NULL;
 678         return udev_device->sysnum;
 679 }
 680
 681 /**
 682  * udev_device_get_devnode:
 683  * @udev_device: udev device
 684  *
 685  * Retrieve the device node file name belonging to the udev device.
 686  * The path is an absolute path, and starts with the device directory.
 687  *
 688  * Returns: the device node file name of the udev device, or #NULL if no device node exists
 689  **/
 690 const char *udev_device_get_devnode(struct udev_device *udev_device)
 691 {
 692         if (udev_device == NULL)
 693                 return NULL;
 694         if (!udev_device->info_loaded)
 695                 device_load_info(udev_device);
 696         return udev_device->devnode;
 697 }
 698
 699 /**
 700  * udev_device_get_subsystem:
 701  * @udev_device: udev device
 702  *
 703  * Retrieve the subsystem string of the udev device. The string does not
 704  * contain any "/".
 705  *
 706  * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
 707  **/
 708 const char *udev_device_get_subsystem(struct udev_device *udev_device)
 709 {
 710         char subsystem[UTIL_NAME_SIZE];
 711
 712         if (udev_device == NULL)
 713                 return NULL;
 714         if (!udev_device->subsystem_set) {
 715                 udev_device->subsystem_set = 1;
 716                 /* read "subsytem" link */
 717                 if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
 718                         udev_device_set_subsystem(udev_device, subsystem);
 719                         return udev_device->subsystem;
 720                 }
 721                 /* implicit names */
 722                 if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
 723                         udev_device_set_subsystem(udev_device, "module");
 724                         return udev_device->subsystem;
 725                 }
 726                 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
 727                         udev_device_set_subsystem(udev_device, "drivers");
 728                         return udev_device->subsystem;
 729                 }
 730                 if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
 731                     strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 732                     strncmp(udev_device->devpath, "/bus/", 5) == 0) {
 733                         udev_device_set_subsystem(udev_device, "subsystem");
 734                         return udev_device->subsystem;
 735                 }
 736         }
 737         return udev_device->subsystem;
 738 }
 739
 740 /**
 741  * udev_device_get_devtype:
 742  * @udev_device: udev device
 743  *
 744  * Retrieve the devtype string of the udev device.
 745  *
 746  * Returns: the devtype name of the udev device, or #NULL if it can not be determined
 747  **/
 748 const char *udev_device_get_devtype(struct udev_device *udev_device)
 749 {
 750         if (udev_device == NULL)
 751                 return NULL;
 752         if (!udev_device->devtype_set) {
 753                 udev_device->devtype_set = 1;
 754                 if (!udev_device->info_loaded)
 755                         udev_device_read_uevent_file(udev_device);
 756         }
 757         return udev_device->devtype;
 758 }
 759
 760 /**
 761  * udev_device_get_devlinks_list_entry:
 762  * @udev_device: udev device
 763  *
 764  * Retrieve the list of device links pointing to the device file of
 765  * the udev device. The next list entry can be retrieved with
 766  * udev_list_entry_next(), which returns #NULL if no more entries exist.
 767  * The devlink path can be retrieved from the list entry by
 768  * udev_list_entry_get_name(). The path is an absolute path, and starts with
 769  * the device directory.
 770  *
 771  * Returns: the first entry of the device node link list
 772  **/
 773 struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
 774 {
 775         if (udev_device == NULL)
 776                 return NULL;
 777         if (!udev_device->info_loaded)
 778                 device_load_info(udev_device);
 779         return udev_list_get_entry(&udev_device->devlinks_list);
 780 }
 781
 782 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
 783 {
 784         udev_device->devlinks_uptodate = 0;
 785         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 786 }
 787
 788 /**
 789  * udev_device_get_properties_list_entry:
 790  * @udev_device: udev device
 791  *
 792  * Retrieve the list of key/value device properties of the udev
 793  * device. The next list entry can be retrieved with udev_list_entry_next(),
 794  * which returns #NULL if no more entries exist. The property name
 795  * can be retrieved from the list entry by udev_list_get_name(),
 796  * the property value by udev_list_get_value().
 797  *
 798  * Returns: the first entry of the property list
 799  **/
 800 struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
 801 {
 802         if (udev_device == NULL)
 803                 return NULL;
 804         if (!udev_device->info_loaded)
 805                 device_load_info(udev_device);
 806         if (!udev_device->devlinks_uptodate) {
 807                 char symlinks[UTIL_PATH_SIZE];
 808                 struct udev_list_entry *list_entry;
 809
 810                 udev_device->devlinks_uptodate = 1;
 811                 list_entry = udev_device_get_devlinks_list_entry(udev_device);
 812                 if (list_entry != NULL) {
 813                         util_strlcpy(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
 814                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
 815                                 util_strlcat(symlinks, " ", sizeof(symlinks));
 816                                 util_strlcat(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
 817                         }
 818                         udev_device_add_property(udev_device, "DEVLINKS", symlinks);
 819                 }
 820         }
 821         return udev_list_get_entry(&udev_device->properties_list);
 822 }
 823
 824 const char *udev_device_get_driver(struct udev_device *udev_device)
 825 {
 826         char driver[UTIL_NAME_SIZE];
 827
 828         if (udev_device == NULL)
 829                 return NULL;
 830         if (!udev_device->driver_set) {
 831                 udev_device->driver_set = 1;
 832                 if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
 833                         udev_device->driver = strdup(driver);
 834         }
 835         return udev_device->driver;
 836 }
 837
 838 dev_t udev_device_get_devnum(struct udev_device *udev_device)
 839 {
 840         if (udev_device == NULL)
 841                 return makedev(0, 0);
 842         if (!udev_device->info_loaded)
 843                 device_load_info(udev_device);
 844         return udev_device->devnum;
 845 }
 846
 847 const char *udev_device_get_action(struct udev_device *udev_device)
 848 {
 849         if (udev_device == NULL)
 850                 return NULL;
 851         return udev_device->action;
 852 }
 853
 854 unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
 855 {
 856         if (udev_device == NULL)
 857                 return 0;
 858         return udev_device->seqnum;
 859 }
 860
 861 const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
 862 {
 863         struct udev_list_entry *list_entry;
 864         char path[UTIL_PATH_SIZE];
 865         char value[UTIL_NAME_SIZE];
 866         struct stat statbuf;
 867         int fd;
 868         ssize_t size;
 869         const char *val = NULL;
 870
 871         if (udev_device == NULL)
 872                 return NULL;
 873         if (sysattr == NULL)
 874                 return NULL;
 875
 876         /* look for possibly already cached result */
 877         udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
 878                 if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
 879                         dbg(udev_device->udev, "got '%s' (%s) from cache\n",
 880                             sysattr, udev_list_entry_get_value(list_entry));
 881                         return udev_list_entry_get_value(list_entry);
 882                 }
 883         }
 884
 885         util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path));
 886         util_strlcat(path, "/", sizeof(path));
 887         util_strlcat(path, sysattr, sizeof(path));
 888
 889         if (lstat(path, &statbuf) != 0) {
 890                 dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
 891                 udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
 892                 goto out;
 893         }
 894
 895         if (S_ISLNK(statbuf.st_mode)) {
 896                 char target[UTIL_NAME_SIZE];
 897                 int len;
 898                 char *pos;
 899
 900                 /* some core links return the last element of the target path */
 901                 if (strcmp(sysattr, "driver") != 0 &&
 902                     strcmp(sysattr, "subsystem") != 0 &&
 903                     strcmp(sysattr, "module") != 0)
 904                         goto out;
 905
 906                 len = readlink(path, target, sizeof(target));
 907                 if (len > 0) {
 908                         target[len] = '\0';
 909                         pos = strrchr(target, '/');
 910                         if (pos != NULL) {
 911                                 pos = &pos[1];
 912                                 dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
 913                                 list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
 914                                 val = udev_list_entry_get_value(list_entry);
 915                         }
 916                 }
 917                 goto out;
 918         }
 919
 920         /* skip directories */
 921         if (S_ISDIR(statbuf.st_mode))
 922                 goto out;
 923
 924         /* skip non-readable files */
 925         if ((statbuf.st_mode & S_IRUSR) == 0)
 926                 goto out;
 927
 928         /* read attribute value */
 929         fd = open(path, O_RDONLY);
 930         if (fd < 0) {
 931                 dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
 932                 goto out;
 933         }
 934         size = read(fd, value, sizeof(value));
 935         close(fd);
 936         if (size < 0)
 937                 goto out;
 938         if (size == sizeof(value))
 939                 goto out;
 940
 941         /* got a valid value, store it in cache and return it */
 942         value[size] = '\0';
 943         util_remove_trailing_chars(value, '\n');
 944         dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
 945         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
 946         val = udev_list_entry_get_value(list_entry);
 947 out:
 948         return val;
 949 }
 950
 951 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
 952 {
 953         const char *pos;
 954         size_t len;
 955
 956         free(udev_device->syspath);
 957         udev_device->syspath = strdup(syspath);
 958         if (udev_device->syspath ==  NULL)
 959                 return -ENOMEM;
 960         udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
 961         udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
 962
 963         pos = strrchr(udev_device->syspath, '/');
 964         if (pos == NULL)
 965                 return -EINVAL;
 966         udev_device->sysname = strdup(&pos[1]);
 967         if (udev_device->sysname == NULL)
 968                 return -ENOMEM;
 969
 970         /* some devices have '!' in their name, change that to '/' */
 971         len = 0;
 972         while (udev_device->sysname[len] != '\0') {
 973                 if (udev_device->sysname[len] == '!')
 974                         udev_device->sysname[len] = '/';
 975                 len++;
 976         }
 977
 978         /* trailing number */
 979         while (len > 0 && isdigit(udev_device->sysname[--len]))
 980                 udev_device->sysnum = &udev_device->sysname[len];
 981
 982         /* sysname is completely numeric */
 983         if (len == 0)
 984                 udev_device->sysnum = NULL;
 985
 986         return 0;
 987 }
 988
 989 int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
 990 {
 991         free(udev_device->subsystem);
 992         udev_device->subsystem = strdup(subsystem);
 993         if (udev_device->subsystem == NULL)
 994                 return -ENOMEM;
 995         udev_device->subsystem_set = 1;
 996         udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
 997         return 0;
 998 }
 999
1000 int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
1001 {
1002         free(udev_device->devtype);
1003         udev_device->devtype = strdup(devtype);
1004         if (udev_device->devtype == NULL)
1005                 return -ENOMEM;
1006         udev_device->devtype_set = 1;
1007         udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
1008         return 0;
1009 }
1010
1011 int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1012 {
1013         free(udev_device->devnode);
1014         udev_device->devnode = strdup(devnode);
1015         if (devnode == NULL)
1016                 return 0;
1017         if (udev_device->devnode == NULL)
1018                 return -ENOMEM;
1019         udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1020         return 0;
1021 }
1022
1023 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1024 {
1025         udev_device->devlinks_uptodate = 0;
1026         if (udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0) == NULL)
1027                 return -ENOMEM;
1028         return 0;
1029 }
1030
1031 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
1032 {
1033         udev_device->envp_uptodate = 0;
1034         if (value == NULL) {
1035                 struct udev_list_entry *list_entry;
1036
1037                 list_entry = udev_device_get_properties_list_entry(udev_device);
1038                 list_entry = udev_list_entry_get_by_name(list_entry, key);
1039                 if (list_entry != NULL)
1040                         udev_list_entry_delete(list_entry);
1041                 return NULL;
1042         }
1043         return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
1044 }
1045
1046 struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
1047 {
1048         char name[UTIL_PATH_SIZE];
1049         char *val;
1050
1051         util_strlcpy(name, property, sizeof(name));
1052         val = strchr(name, '=');
1053         if (val == NULL)
1054                 return NULL;
1055         val[0] = '\0';
1056         val = &val[1];
1057         if (val[0] == '\0')
1058                 val = NULL;
1059         return udev_device_add_property(udev_device, name, val);
1060 }
1061
1062 #define ENVP_SIZE                       128
1063 #define MONITOR_BUF_SIZE                4096
1064 static int update_envp_monitor_buf(struct udev_device *udev_device)
1065 {
1066         const char *action;
1067         struct udev_list_entry *list_entry;
1068         size_t bufpos;
1069         size_t len;
1070         unsigned int i;
1071
1072         /* monitor buffer of property strings */
1073         free(udev_device->monitor_buf);
1074         udev_device->monitor_buf_len = 0;
1075         udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1076         if (udev_device->monitor_buf == NULL)
1077                 return -ENOMEM;
1078
1079         /* envp array, strings will point into monitor buffer */
1080         if (udev_device->envp == NULL)
1081                 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1082         if (udev_device->envp == NULL)
1083                 return -ENOMEM;
1084
1085         /* header <action>@<devpath> */
1086         action = udev_device_get_action(udev_device);
1087         if (action == NULL)
1088                 return -EINVAL;
1089         bufpos = util_strlcpy(udev_device->monitor_buf, action, MONITOR_BUF_SIZE);
1090         len = util_strlcpy(&udev_device->monitor_buf[bufpos], "@", MONITOR_BUF_SIZE-bufpos);
1091         if (len >= MONITOR_BUF_SIZE-bufpos)
1092                 return -EINVAL;
1093         bufpos += len;
1094         len = util_strlcpy(&udev_device->monitor_buf[bufpos],
1095                            udev_device_get_devpath(udev_device),
1096                            MONITOR_BUF_SIZE-bufpos);
1097         if (len+1 >= MONITOR_BUF_SIZE-bufpos)
1098                 return -EINVAL;
1099         bufpos += len+1;
1100
1101         i = 0;
1102         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1103                 /* add string to envp array */
1104                 udev_device->envp[i++] = &udev_device->monitor_buf[bufpos];
1105                 if (i+1 >= ENVP_SIZE)
1106                         return -EINVAL;
1107
1108                 /* add property string to monitor buffer */
1109                 len = util_strlcpy(&udev_device->monitor_buf[bufpos],
1110                                    udev_list_entry_get_name(list_entry), MONITOR_BUF_SIZE-bufpos);
1111                 if (len >= MONITOR_BUF_SIZE-bufpos)
1112                         return -EINVAL;
1113                 bufpos += len;
1114                 len = util_strlcpy(&udev_device->monitor_buf[bufpos], "=", MONITOR_BUF_SIZE-bufpos);
1115                 if (len >= MONITOR_BUF_SIZE-bufpos)
1116                         return -EINVAL;
1117                 bufpos += len;
1118                 len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_value(list_entry),
1119                                    MONITOR_BUF_SIZE-bufpos);
1120                 if (len+1 >= MONITOR_BUF_SIZE-bufpos)
1121                         return -EINVAL;
1122                 bufpos += len+1;
1123         }
1124         udev_device->envp[i] = NULL;
1125         udev_device->monitor_buf_len = bufpos;
1126         udev_device->envp_uptodate = 1;
1127         dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n", i, bufpos);
1128         return 0;
1129 }
1130
1131 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1132 {
1133         if (!udev_device->envp_uptodate)
1134                 if (update_envp_monitor_buf(udev_device) != 0)
1135                         return NULL;
1136         return udev_device->envp;
1137 }
1138
1139 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1140 {
1141         if (!udev_device->envp_uptodate)
1142                 if (update_envp_monitor_buf(udev_device) != 0)
1143                         return -EINVAL;
1144         *buf = udev_device->monitor_buf;
1145         return udev_device->monitor_buf_len;
1146 }
1147
1148 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1149 {
1150         free(udev_device->action);
1151         udev_device->action = strdup(action);
1152         if (udev_device->action == NULL)
1153                 return -ENOMEM;
1154         udev_device_add_property(udev_device, "ACTION", udev_device->action);
1155         return 0;
1156 }
1157
1158 int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
1159 {
1160         free(udev_device->driver);
1161         udev_device->driver = strdup(driver);
1162         if (udev_device->driver == NULL)
1163                 return -ENOMEM;
1164         udev_device->driver_set = 1;
1165         udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
1166         return 0;
1167 }
1168
1169 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
1170 {
1171         return udev_device->devpath_old;
1172 }
1173
1174 int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
1175 {
1176         udev_device->devpath_old = strdup(devpath_old);
1177         if (udev_device->devpath_old == NULL)
1178                 return -ENOMEM;
1179         udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
1180         return 0;
1181 }
1182
1183 const char *udev_device_get_physdevpath(struct udev_device *udev_device)
1184 {
1185         return udev_device->physdevpath;
1186 }
1187
1188 int udev_device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath)
1189 {
1190         udev_device->physdevpath = strdup(physdevpath);
1191         if (udev_device->physdevpath == NULL)
1192                 return -ENOMEM;
1193         return 0;
1194 }
1195
1196 int udev_device_get_timeout(struct udev_device *udev_device)
1197 {
1198         return udev_device->timeout;
1199 }
1200
1201 int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
1202 {
1203         udev_device->timeout = timeout;
1204         return 0;
1205 }
1206 int udev_device_get_event_timeout(struct udev_device *udev_device)
1207 {
1208         if (!udev_device->info_loaded)
1209                 device_load_info(udev_device);
1210         return udev_device->event_timeout;
1211 }
1212
1213 int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
1214 {
1215         udev_device->event_timeout = event_timeout;
1216         return 0;
1217 }
1218
1219 int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
1220 {
1221         char num[32];
1222
1223         udev_device->seqnum = seqnum;
1224         snprintf(num, sizeof(num), "%llu", seqnum);
1225         udev_device_add_property(udev_device, "SEQNUM", num);
1226         return 0;
1227 }
1228
1229 int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
1230 {
1231         char num[32];
1232
1233         udev_device->devnum = devnum;
1234
1235         snprintf(num, sizeof(num), "%u", major(devnum));
1236         udev_device_add_property(udev_device, "MAJOR", num);
1237         snprintf(num, sizeof(num), "%u", minor(devnum));
1238         udev_device_add_property(udev_device, "MINOR", num);
1239         return 0;
1240 }
1241
1242 int udev_device_get_num_fake_partitions(struct udev_device *udev_device)
1243 {
1244         if (!udev_device->info_loaded)
1245                 device_load_info(udev_device);
1246         return udev_device->num_fake_partitions;
1247 }
1248
1249 int udev_device_set_num_fake_partitions(struct udev_device *udev_device, int num)
1250 {
1251         udev_device->num_fake_partitions = num;
1252         return 0;
1253 }
1254
1255 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1256 {
1257         if (!udev_device->info_loaded)
1258                 device_load_info(udev_device);
1259         return udev_device->devlink_priority;
1260 }
1261
1262 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1263 {
1264          udev_device->devlink_priority = prio;
1265         return 0;
1266 }
1267
1268 int udev_device_get_ignore_remove(struct udev_device *udev_device)
1269 {
1270         if (!udev_device->info_loaded)
1271                 device_load_info(udev_device);
1272         return udev_device->ignore_remove;
1273 }
1274
1275 int udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore)
1276 {
1277         udev_device->ignore_remove = ignore;
1278         return 0;
1279 }