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 <sys/stat.h>
  29
  30 #include "libudev.h"
  31 #include "libudev-private.h"
  32
  33 struct udev_device {
  34         int refcount;
  35         struct udev *udev;
  36         struct udev_device *parent_device;
  37         char *syspath;
  38         const char *devpath;
  39         const char *sysname;
  40         char *devnode;
  41         char *subsystem;
  42         struct list_node devlink_list;
  43         struct list_node properties_list;
  44         char *action;
  45         int event_timeout;
  46         char *driver;
  47         char *devpath_old;
  48         char *physdevpath;
  49         int timeout;
  50         dev_t devnum;
  51         unsigned long long int seqnum;
  52         int num_fake_partitions;
  53         int devlink_priority;
  54         int ignore_remove;
  55         struct list_node attr_list;
  56         int info_loaded;
  57 };
  58
  59 static size_t syspath_to_db_path(struct udev_device *udev_device, char *filename, size_t len)
  60 {
  61         size_t start;
  62
  63         /* translate to location of db file */
  64         util_strlcpy(filename, udev_get_dev_path(udev_device->udev), len);
  65         start = util_strlcat(filename, "/.udev/db/", len);
  66         util_strlcat(filename, udev_device->devpath, len);
  67         return util_path_encode(&filename[start], len - start);
  68 }
  69
  70 static int device_read_db(struct udev_device *udev_device)
  71 {
  72         struct stat stats;
  73         char filename[UTIL_PATH_SIZE];
  74         char line[UTIL_LINE_SIZE];
  75         FILE *f;
  76
  77         syspath_to_db_path(udev_device, filename, sizeof(filename));
  78
  79         if (lstat(filename, &stats) != 0) {
  80                 info(udev_device->udev, "no db file to read %s: %s\n", filename, strerror(errno));
  81                 return -1;
  82         }
  83         if ((stats.st_mode & S_IFMT) == S_IFLNK) {
  84                 char target[UTIL_PATH_SIZE];
  85                 int target_len;
  86
  87                 target_len = readlink(filename, target, sizeof(target));
  88                 if (target_len > 0)
  89                         target[target_len] = '\0';
  90                 else {
  91                         info(udev_device->udev, "error reading db link %s: %s\n", filename, strerror(errno));
  92                         return -1;
  93                 }
  94                 if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0)
  95                         return -ENOMEM;
  96                 info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
  97                 return 0;
  98         }
  99
 100         f = fopen(filename, "r");
 101         if (f == NULL) {
 102                 info(udev_device->udev, "error reading db file %s: %s\n", filename, strerror(errno));
 103                 return -1;
 104         }
 105         while (fgets(line, sizeof(line), f)) {
 106                 ssize_t len;
 107                 const char *val;
 108
 109                 len = strlen(line);
 110                 if (len < 4)
 111                         break;
 112                 line[len-1] = '\0';
 113                 val = &line[2];
 114
 115                 switch(line[0]) {
 116                 case 'N':
 117                         asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), val);
 118                         break;
 119                 case 'S':
 120                         util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
 121                         util_strlcat(filename, "/", sizeof(filename));
 122                         util_strlcat(filename, val, sizeof(filename));
 123                         device_add_devlink(udev_device, filename);
 124                         break;
 125                 case 'L':
 126                         device_set_devlink_priority(udev_device, atoi(val));
 127                         break;
 128                 case 'T':
 129                         device_set_event_timeout(udev_device, atoi(val));
 130                         break;
 131                 case 'A':
 132                         device_set_num_fake_partitions(udev_device, atoi(val));
 133                         break;
 134                 case 'R':
 135                         device_set_ignore_remove(udev_device, atoi(val));
 136                         break;
 137                 case 'E':
 138                         device_add_property_from_string(udev_device, val);
 139                         break;
 140                 }
 141         }
 142         fclose(f);
 143
 144         info(udev_device->udev, "device %p filled with db file data\n", udev_device);
 145         return 0;
 146 }
 147
 148 static int device_read_uevent_file(struct udev_device *udev_device)
 149 {
 150         char filename[UTIL_PATH_SIZE];
 151         FILE *f;
 152         char line[UTIL_LINE_SIZE];
 153         int maj = 0;
 154         int min = 0;
 155
 156         util_strlcpy(filename, udev_device->syspath, sizeof(filename));
 157         util_strlcat(filename, "/uevent", sizeof(filename));
 158         f = fopen(filename, "r");
 159         if (f == NULL)
 160                 return -1;
 161
 162         while (fgets(line, sizeof(line), f)) {
 163                 char *pos;
 164
 165                 pos = strchr(line, '\n');
 166                 if (pos == NULL)
 167                         continue;
 168                 pos[0] = '\0';
 169
 170                 if (strncmp(line, "MAJOR=", 6) == 0)
 171                         maj = strtoull(&line[6], NULL, 10);
 172                 else if (strncmp(line, "MINOR=", 6) == 0)
 173                         min = strtoull(&line[6], NULL, 10);
 174
 175                 device_add_property_from_string(udev_device, line);
 176         }
 177
 178         udev_device->devnum = makedev(maj, min);
 179
 180         fclose(f);
 181         return 0;
 182 }
 183
 184 static void device_load_info(struct udev_device *device)
 185 {
 186         device_read_uevent_file(device);
 187         device_read_db(device);
 188         device->info_loaded = 1;
 189 }
 190
 191 void device_set_info_loaded(struct udev_device *device)
 192 {
 193         device->info_loaded = 1;
 194 }
 195
 196 struct udev_device *device_init(struct udev *udev)
 197 {
 198         struct udev_device *udev_device;
 199
 200         if (udev == NULL)
 201                 return NULL;
 202
 203         udev_device = malloc(sizeof(struct udev_device));
 204         if (udev_device == NULL)
 205                 return NULL;
 206         memset(udev_device, 0x00, sizeof(struct udev_device));
 207         udev_device->refcount = 1;
 208         udev_device->udev = udev;
 209         list_init(&udev_device->devlink_list);
 210         list_init(&udev_device->properties_list);
 211         list_init(&udev_device->attr_list);
 212         info(udev_device->udev, "udev_device: %p created\n", udev_device);
 213         return udev_device;
 214 }
 215
 216 /**
 217  * udev_device_new_from_syspath:
 218  * @udev: udev library context
 219  * @syspath: sys device path including sys directory
 220  *
 221  * Create new udev device, and fill in information from the sys
 222  * device and the udev database entry. The sypath is the absolute
 223  * path to the device, including the sys mount point.
 224  *
 225  * The initial refcount is 1, and needs to be decremented to
 226  * release the ressources of the udev device.
 227  *
 228  * Returns: a new udev device, or #NULL, if it does not exist
 229  **/
 230 struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 231 {
 232         size_t len;
 233         const char *subdir;
 234         const char *pos;
 235         char path[UTIL_PATH_SIZE];
 236         struct stat statbuf;
 237         struct udev_device *udev_device;
 238
 239         if (udev == NULL)
 240                 return NULL;
 241         if (syspath == NULL)
 242                 return NULL;
 243
 244         /* path starts in sys */
 245         len = strlen(udev_get_sys_path(udev));
 246         if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
 247                 info(udev, "not in sys :%s\n", syspath);
 248                 return NULL;
 249         }
 250
 251         /* path is not a root directory */
 252         subdir = &syspath[len+1];
 253         pos = strrchr(subdir, '/');
 254         if (pos == NULL || pos < &subdir[2]) {
 255                 info(udev, "not in subdir :%s\n", syspath);
 256                 return NULL;
 257         }
 258
 259         /* resolve possible symlink to real path */
 260         util_strlcpy(path, syspath, sizeof(path));
 261         util_resolve_sys_link(udev, path, sizeof(path));
 262
 263         /* path exists in sys */
 264         if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
 265             strncmp(&syspath[len], "/class/", 7) == 0 ||
 266             strncmp(&syspath[len], "/block/", 7) == 0) {
 267                 char file[UTIL_PATH_SIZE];
 268
 269                 /* all "devices" require a "uevent" file */
 270                 util_strlcpy(file, path, sizeof(file));
 271                 util_strlcat(file, "/uevent", sizeof(file));
 272                 if (stat(file, &statbuf) != 0) {
 273                         info(udev, "not a device: %s\n", syspath);
 274                         return NULL;
 275                 }
 276         } else {
 277                 /* everything else just needs to be a directory */
 278                 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
 279                         info(udev, "directory not found: %s\n", syspath);
 280                         return NULL;
 281                 }
 282         }
 283
 284         udev_device = device_init(udev);
 285         if (udev_device == NULL)
 286                 return NULL;
 287
 288         device_set_syspath(udev_device, path);
 289         info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 290
 291         return udev_device;
 292 }
 293
 294 struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
 295 {
 296         char path[UTIL_PATH_SIZE];
 297         const char *type_str;
 298         struct udev_enumerate *enumerate;
 299         struct udev_list_entry *list_entry;
 300         struct udev_device *device = NULL;
 301
 302         if (type == 'b')
 303                 type_str = "block";
 304         else if (type == 'c')
 305                 type_str = "char";
 306         else
 307                 return NULL;
 308
 309         /* /sys/dev/{block,char}/<maj>:<min> link */
 310         snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev),
 311                  type_str, major(devnum), minor(devnum));
 312         if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
 313                 return udev_device_new_from_syspath(udev, path);
 314
 315         /* fallback to search all sys devices for the major/minor */
 316         enumerate = udev_enumerate_new_from_subsystems(udev, NULL);
 317         if (enumerate == NULL)
 318                 return NULL;
 319         udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
 320                 struct udev_device *device_loop;
 321
 322                 device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
 323                 if (device_loop != NULL) {
 324                         if (udev_device_get_devnum(device_loop) == devnum) {
 325                                 device = device_loop;
 326                                 break;
 327                         }
 328                         udev_device_unref(device_loop);
 329                 }
 330         }
 331         udev_enumerate_unref(enumerate);
 332         return device;
 333 }
 334
 335 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
 336 {
 337         struct udev_device *udev_device_parent = NULL;
 338         char path[UTIL_PATH_SIZE];
 339         const char *subdir;
 340
 341         /* follow "device" link in deprecated sys layout */
 342         if (strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 343             strncmp(udev_device->devpath, "/block/", 7) == 0) {
 344                 util_strlcpy(path, udev_device->syspath, sizeof(path));
 345                 util_strlcat(path, "/device", sizeof(path));
 346                 if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0)
 347                         udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 348                 return udev_device_parent;
 349         }
 350
 351         util_strlcpy(path, udev_device->syspath, sizeof(path));
 352         subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
 353         while (1) {
 354                 char *pos;
 355
 356                 pos = strrchr(subdir, '/');
 357                 if (pos == NULL || pos < &subdir[2])
 358                         break;
 359                 pos[0] = '\0';
 360                 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 361                 if (udev_device_parent != NULL)
 362                         return udev_device_parent;
 363         }
 364         return NULL;
 365 }
 366
 367 struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 368 {
 369         if (udev_device == NULL)
 370                 return NULL;
 371
 372         if (udev_device->parent_device != NULL) {
 373                 info(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
 374                 return udev_device->parent_device;
 375         }
 376         udev_device->parent_device = device_new_from_parent(udev_device);
 377         return udev_device->parent_device;
 378 }
 379
 380 /**
 381  * udev_device_get_udev:
 382  * @udev_device: udev device
 383  *
 384  * Retrieve the udev library context the device was created with.
 385  *
 386  * Returns: the udev library context
 387  **/
 388 struct udev *udev_device_get_udev(struct udev_device *udev_device)
 389 {
 390         if (udev_device == NULL)
 391                 return NULL;
 392         return udev_device->udev;
 393 }
 394
 395 /**
 396  * udev_device_ref:
 397  * @udev_device: udev device
 398  *
 399  * Take a reference of a udev device.
 400  *
 401  * Returns: the passed udev device
 402  **/
 403 struct udev_device *udev_device_ref(struct udev_device *udev_device)
 404 {
 405         if (udev_device == NULL)
 406                 return NULL;
 407         udev_device->refcount++;
 408         return udev_device;
 409 }
 410
 411 /**
 412  * udev_device_unref:
 413  * @udev_device: udev device
 414  *
 415  * Drop a reference of a udev device. If the refcount reaches zero,
 416  * the ressources of the device will be released.
 417  *
 418  **/
 419 void udev_device_unref(struct udev_device *udev_device)
 420 {
 421         if (udev_device == NULL)
 422                 return;
 423         udev_device->refcount--;
 424         if (udev_device->refcount > 0)
 425                 return;
 426         if (udev_device->parent_device != NULL)
 427                 udev_device_unref(udev_device->parent_device);
 428         free(udev_device->syspath);
 429         free(udev_device->devnode);
 430         free(udev_device->subsystem);
 431         list_cleanup(udev_device->udev, &udev_device->devlink_list);
 432         list_cleanup(udev_device->udev, &udev_device->properties_list);
 433         free(udev_device->action);
 434         free(udev_device->driver);
 435         free(udev_device->devpath_old);
 436         free(udev_device->physdevpath);
 437         list_cleanup(udev_device->udev, &udev_device->attr_list);
 438         info(udev_device->udev, "udev_device: %p released\n", udev_device);
 439         free(udev_device);
 440 }
 441
 442 /**
 443  * udev_device_get_devpath:
 444  * @udev_device: udev device
 445  *
 446  * Retrieve the kernel devpath value of the udev device. The path
 447  * does not contain the sys mount point, and starts with a '/'.
 448  *
 449  * Returns: the devpath of the udev device
 450  **/
 451 const char *udev_device_get_devpath(struct udev_device *udev_device)
 452 {
 453         if (udev_device == NULL)
 454                 return NULL;
 455         return udev_device->devpath;
 456 }
 457
 458 /**
 459  * udev_device_get_syspath:
 460  * @udev_device: udev device
 461  *
 462  * Retrieve the sys path of the udev device. The path is an
 463  * absolute path and starts with the sys mount point.
 464  *
 465  * Returns: the sys path of the udev device
 466  **/
 467 const char *udev_device_get_syspath(struct udev_device *udev_device)
 468 {
 469         if (udev_device == NULL)
 470                 return NULL;
 471         return udev_device->syspath;
 472 }
 473
 474 const char *udev_device_get_sysname(struct udev_device *udev_device)
 475 {
 476         if (udev_device == NULL)
 477                 return NULL;
 478         return udev_device->sysname;
 479 }
 480
 481 /**
 482  * udev_device_get_devnode:
 483  * @udev_device: udev device
 484  *
 485  * Retrieve the device node file name belonging to the udev device.
 486  * The path is an absolute path, and starts with the device directory.
 487  *
 488  * Returns: the device node file name of the udev device, or #NULL if no device node exists
 489  **/
 490 const char *udev_device_get_devnode(struct udev_device *udev_device)
 491 {
 492         if (udev_device == NULL)
 493                 return NULL;
 494         if (!udev_device->info_loaded)
 495                 device_load_info(udev_device);
 496         return udev_device->devnode;
 497 }
 498
 499 /**
 500  * udev_device_get_subsystem:
 501  * @udev_device: udev device
 502  *
 503  * Retrieve the subsystem string of the udev device. The string does not
 504  * contain any "/".
 505  *
 506  * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
 507  **/
 508 const char *udev_device_get_subsystem(struct udev_device *udev_device)
 509 {
 510         char subsystem[UTIL_NAME_SIZE];
 511
 512         if (udev_device == NULL)
 513                 return NULL;
 514         if (udev_device->subsystem != NULL)
 515                 return udev_device->subsystem;
 516
 517         /* read "subsytem" link */
 518         if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
 519                 udev_device->subsystem = strdup(subsystem);
 520                 return udev_device->subsystem;
 521         }
 522
 523         /* implicit names */
 524         if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
 525                 udev_device->subsystem = strdup("module");
 526                 return udev_device->subsystem;
 527         }
 528         if (strstr(udev_device->devpath, "/drivers/") != NULL) {
 529                 udev_device->subsystem = strdup("drivers");
 530                 return udev_device->subsystem;
 531         }
 532         if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
 533             strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 534             strncmp(udev_device->devpath, "/bus/", 5) == 0) {
 535                 udev_device->subsystem = strdup("subsystem");
 536                 return udev_device->subsystem;
 537         }
 538         return NULL;
 539 }
 540
 541 /**
 542  * udev_device_get_devlinks_list_entry:
 543  * @udev_device: udev device
 544  *
 545  * Retrieve the list of device links pointing to the device file of
 546  * the udev device. The next list entry can be retrieved with
 547  * udev_list_entry_next(), which returns #NULL if no more entries exist.
 548  * The devlink path can be retrieved from the list entry by
 549  * udev_list_entry_get_name(). The path is an absolute path, and starts with
 550  * the device directory.
 551  *
 552  * Returns: the first entry of the device node link list
 553  **/
 554 struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
 555 {
 556         if (udev_device == NULL)
 557                 return NULL;
 558         if (!udev_device->info_loaded)
 559                 device_load_info(udev_device);
 560         return list_get_entry(&udev_device->devlink_list);
 561 }
 562
 563 /**
 564  * udev_device_get_properties_list_entry:
 565  * @udev_device: udev device
 566  *
 567  * Retrieve the list of key/value device properties of the udev
 568  * device. The next list entry can be retrieved with udev_list_entry_next(),
 569  * which returns #NULL if no more entries exist. The property name
 570  * can be retrieved from the list entry by udev_list_get_name(),
 571  * the property value by udev_list_get_value().
 572  *
 573  * Returns: the first entry of the property list
 574  **/
 575 struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
 576 {
 577         if (udev_device == NULL)
 578                 return NULL;
 579         if (!udev_device->info_loaded)
 580                 device_load_info(udev_device);
 581         return list_get_entry(&udev_device->properties_list);
 582 }
 583
 584 const char *udev_device_get_driver(struct udev_device *udev_device)
 585 {
 586         char driver[UTIL_NAME_SIZE];
 587
 588         if (udev_device == NULL)
 589                 return NULL;
 590         if (udev_device->driver != NULL)
 591                 return udev_device->driver;
 592         if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) < 2)
 593                 return NULL;
 594         udev_device->driver = strdup(driver);
 595         return udev_device->driver;
 596 }
 597
 598 dev_t udev_device_get_devnum(struct udev_device *udev_device)
 599 {
 600         if (udev_device == NULL)
 601                 return makedev(0, 0);
 602         if (!udev_device->info_loaded)
 603                 device_load_info(udev_device);
 604         return udev_device->devnum;
 605 }
 606
 607 const char *udev_device_get_action(struct udev_device *udev_device)
 608 {
 609         if (udev_device == NULL)
 610                 return NULL;
 611         return udev_device->action;
 612 }
 613
 614 unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
 615 {
 616         if (udev_device == NULL)
 617                 return 0;
 618         return udev_device->seqnum;
 619 }
 620
 621 const char *udev_device_get_attr_value(struct udev_device *udev_device, const char *attr)
 622 {
 623         struct udev_list_entry *list_entry;
 624         char path[UTIL_PATH_SIZE];
 625         char value[UTIL_NAME_SIZE];
 626         struct stat statbuf;
 627         int fd;
 628         ssize_t size;
 629         const char *val = NULL;
 630
 631         /* look for possibly already cached result */
 632         udev_list_entry_foreach(list_entry, list_get_entry(&udev_device->attr_list)) {
 633                 if (strcmp(udev_list_entry_get_name(list_entry), attr) == 0) {
 634                         info(udev_device->udev, "got '%s' (%s) from cache\n", attr, udev_list_entry_get_value(list_entry));
 635                         return udev_list_entry_get_value(list_entry);
 636                 }
 637         }
 638
 639         util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path));
 640         util_strlcat(path, "/", sizeof(path));
 641         util_strlcat(path, attr, sizeof(path));
 642
 643         if (lstat(path, &statbuf) != 0) {
 644                 info(udev_device->udev, "stat '%s' failed: %s\n", path, strerror(errno));
 645                 goto out;
 646         }
 647
 648         if (S_ISLNK(statbuf.st_mode)) {
 649                 /* links return the last element of the target path */
 650                 char target[UTIL_NAME_SIZE];
 651                 int len;
 652                 char *pos;
 653
 654                 len = readlink(path, target, sizeof(target));
 655                 if (len > 0) {
 656                         target[len] = '\0';
 657                         pos = strrchr(target, '/');
 658                         if (pos != NULL) {
 659                                 pos = &pos[1];
 660                                 info(udev_device->udev, "cache '%s' with link value '%s'\n", attr, pos);
 661                                 list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, pos, 0, 0);
 662                                 val = udev_list_entry_get_value(list_entry);
 663                         }
 664                 }
 665                 goto out;
 666         }
 667
 668         /* skip directories */
 669         if (S_ISDIR(statbuf.st_mode))
 670                 goto out;
 671
 672         /* skip non-readable files */
 673         if ((statbuf.st_mode & S_IRUSR) == 0)
 674                 goto out;
 675
 676         /* read attribute value */
 677         fd = open(path, O_RDONLY);
 678         if (fd < 0) {
 679                 info(udev_device->udev, "attribute '%s' can not be opened\n", path);
 680                 goto out;
 681         }
 682         size = read(fd, value, sizeof(value));
 683         close(fd);
 684         if (size < 0)
 685                 goto out;
 686         if (size == sizeof(value))
 687                 goto out;
 688
 689         /* got a valid value, store it in cache and return it */
 690         value[size] = '\0';
 691         util_remove_trailing_chars(value, '\n');
 692         info(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
 693         list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, value, 0, 0);
 694         val = udev_list_entry_get_value(list_entry);
 695 out:
 696         return val;
 697 }
 698 int device_set_syspath(struct udev_device *udev_device, const char *syspath)
 699 {
 700         const char *pos;
 701
 702         udev_device->syspath = strdup(syspath);
 703         if (udev_device->syspath ==  NULL)
 704                 return -ENOMEM;
 705         udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
 706         pos = strrchr(udev_device->syspath, '/');
 707         if (pos == NULL)
 708                 return -EINVAL;
 709         udev_device->sysname = &pos[1];
 710         return 0;
 711 }
 712
 713 int device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
 714 {
 715         udev_device->subsystem = strdup(subsystem);
 716         if (udev_device->subsystem == NULL)
 717                 return -1;
 718         return 0;
 719 }
 720
 721 int device_set_devnode(struct udev_device *udev_device, const char *devnode)
 722 {
 723         udev_device->devnode = strdup(devnode);
 724         if (udev_device->devnode == NULL)
 725                 return -ENOMEM;
 726         return 0;
 727 }
 728
 729 int device_add_devlink(struct udev_device *udev_device, const char *devlink)
 730 {
 731         if (list_entry_add(udev_device->udev, &udev_device->devlink_list, devlink, NULL, 1, 0) == NULL)
 732                 return -ENOMEM;
 733         return 0;
 734 }
 735
 736 int device_add_property(struct udev_device *udev_device, const char *key, const char *value)
 737 {
 738         if (list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0) == NULL)
 739                 return -ENOMEM;
 740         return 0;
 741 }
 742
 743 int device_add_property_from_string(struct udev_device *udev_device, const char *property)
 744 {
 745         char name[UTIL_PATH_SIZE];
 746         char *val;
 747
 748         strncpy(name, property, sizeof(name));
 749         val = strchr(name, '=');
 750         if (val == NULL)
 751                 return -1;
 752         val[0] = '\0';
 753         val = &val[1];
 754         if (val[0] == '\0')
 755                 val = NULL;
 756         device_add_property(udev_device, name, val);
 757         return 0;
 758 }
 759
 760 int device_set_action(struct udev_device *udev_device, const char *action)
 761 {
 762         udev_device->action = strdup(action);
 763         if (udev_device->action == NULL)
 764                 return -ENOMEM;
 765         return 0;
 766 }
 767
 768 int device_set_driver(struct udev_device *udev_device, const char *driver)
 769 {
 770         udev_device->driver = strdup(driver);
 771         if (udev_device->driver == NULL)
 772                 return -ENOMEM;
 773         return 0;
 774 }
 775
 776 const char *device_get_devpath_old(struct udev_device *udev_device)
 777 {
 778         return udev_device->devpath_old;
 779 }
 780
 781 int device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
 782 {
 783         udev_device->devpath_old = strdup(devpath_old);
 784         if (udev_device->devpath_old == NULL)
 785                 return -ENOMEM;
 786         return 0;
 787 }
 788
 789 const char *device_get_physdevpath(struct udev_device *udev_device)
 790 {
 791         return udev_device->physdevpath;
 792 }
 793
 794 int device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath)
 795 {
 796         udev_device->physdevpath = strdup(physdevpath);
 797         if (udev_device->physdevpath == NULL)
 798                 return -ENOMEM;
 799         return 0;
 800 }
 801
 802 int device_get_timeout(struct udev_device *udev_device)
 803 {
 804         return udev_device->timeout;
 805 }
 806
 807 int device_set_timeout(struct udev_device *udev_device, int timeout)
 808 {
 809         udev_device->timeout = timeout;
 810         return 0;
 811 }
 812 int device_get_event_timeout(struct udev_device *udev_device)
 813 {
 814         if (!udev_device->info_loaded)
 815                 device_load_info(udev_device);
 816         return udev_device->event_timeout;
 817 }
 818
 819 int device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
 820 {
 821         udev_device->event_timeout = event_timeout;
 822         return 0;
 823 }
 824
 825 int device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
 826 {
 827         udev_device->seqnum = seqnum;
 828         return 0;
 829 }
 830
 831 int device_set_devnum(struct udev_device *udev_device, dev_t devnum)
 832 {
 833         udev_device->devnum = devnum;
 834         return 0;
 835 }
 836
 837 int device_get_num_fake_partitions(struct udev_device *udev_device)
 838 {
 839         if (!udev_device->info_loaded)
 840                 device_load_info(udev_device);
 841         return udev_device->num_fake_partitions;
 842 }
 843
 844 int device_set_num_fake_partitions(struct udev_device *udev_device, int num)
 845 {
 846         udev_device->num_fake_partitions = num;
 847         return 0;
 848 }
 849
 850 int device_get_devlink_priority(struct udev_device *udev_device)
 851 {
 852         if (!udev_device->info_loaded)
 853                 device_load_info(udev_device);
 854         return udev_device->devlink_priority;
 855 }
 856
 857 int device_set_devlink_priority(struct udev_device *udev_device, int prio)
 858 {
 859          udev_device->devlink_priority = prio;
 860         return 0;
 861 }
 862
 863 int device_get_ignore_remove(struct udev_device *udev_device)
 864 {
 865         if (!udev_device->info_loaded)
 866                 device_load_info(udev_device);
 867         return udev_device->ignore_remove;
 868 }
 869
 870 int device_set_ignore_remove(struct udev_device *udev_device, int ignore)
 871 {
 872         udev_device->ignore_remove = ignore;
 873         return 0;
 874 }
 875