libudev/libudev-device.c

   1 /*
   2  * libudev - interface to udev device information
   3  *
   4  * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   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.
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <stddef.h>
  15 #include <unistd.h>
  16 #include <stdbool.h>
  17 #include <errno.h>
  18 #include <string.h>
  19 #include <dirent.h>
  20 #include <fcntl.h>
  21 #include <ctype.h>
  22 #include <sys/stat.h>
  23
  24 #include "libudev.h"
  25 #include "libudev-private.h"
  26
  27 /**
  28  * SECTION:libudev-device
  29  * @short_description: kernel sys devices
  30  *
  31  * Representation of kernel sys devices. Devices are uniquely identified
  32  * by their syspath, every device has exactly one path in the kernel sys
  33  * filesystem. Devices usually belong to a kernel subsystem, and and have
  34  * a unique name inside that subsystem.
  35  */
  36
  37 /**
  38  * udev_device:
  39  *
  40  * Opaque object representing one kernel sys device.
  41  */
  42 struct udev_device {
  43         struct udev *udev;
  44         struct udev_device *parent_device;
  45         char *syspath;
  46         const char *devpath;
  47         char *sysname;
  48         const char *sysnum;
  49         char *devnode;
  50         char *subsystem;
  51         char *devtype;
  52         char *driver;
  53         char *action;
  54         char *devpath_old;
  55         char *sysname_old;
  56         char *knodename;
  57         char **envp;
  58         char *monitor_buf;
  59         size_t monitor_buf_len;
  60         struct udev_list_node devlinks_list;
  61         struct udev_list_node properties_list;
  62         struct udev_list_node sysattr_list;
  63         unsigned long long int seqnum;
  64         int event_timeout;
  65         int timeout;
  66         int devlink_priority;
  67         int refcount;
  68         dev_t devnum;
  69         int watch_handle;
  70         int maj, min;
  71         unsigned int parent_set:1;
  72         unsigned int subsystem_set:1;
  73         unsigned int devtype_set:1;
  74         unsigned int devlinks_uptodate:1;
  75         unsigned int envp_uptodate:1;
  76         unsigned int driver_set:1;
  77         unsigned int info_loaded:1;
  78 };
  79
  80 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
  81 {
  82         udev_device->envp_uptodate = 0;
  83         if (value == NULL) {
  84                 struct udev_list_entry *list_entry;
  85
  86                 list_entry = udev_device_get_properties_list_entry(udev_device);
  87                 list_entry = udev_list_entry_get_by_name(list_entry, key);
  88                 if (list_entry != NULL)
  89                         udev_list_entry_delete(list_entry);
  90                 return NULL;
  91         }
  92         return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
  93 }
  94
  95 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
  96 {
  97         char name[UTIL_LINE_SIZE];
  98         char *val;
  99
 100         util_strscpy(name, sizeof(name), property);
 101         val = strchr(name, '=');
 102         if (val == NULL)
 103                 return NULL;
 104         val[0] = '\0';
 105         val = &val[1];
 106         if (val[0] == '\0')
 107                 val = NULL;
 108         return udev_device_add_property(udev_device, name, val);
 109 }
 110
 111 /*
 112  * parse property string, and if needed, update internal values accordingly
 113  *
 114  * udev_device_add_property_from_string_parse_finish() needs to be
 115  * called after adding properties, and its return value checked
 116  *
 117  * udev_device_set_info_loaded() needs to be set, to avoid trying
 118  * to use a device without a DEVPATH set
 119  */
 120 void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
 121 {
 122         if (strncmp(property, "DEVPATH=", 8) == 0) {
 123                 char path[UTIL_PATH_SIZE];
 124
 125                 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_device->udev), &property[8], NULL);
 126                 udev_device_set_syspath(udev_device, path);
 127         } else if (strncmp(property, "SUBSYSTEM=", 10) == 0) {
 128                 udev_device_set_subsystem(udev_device, &property[10]);
 129         } else if (strncmp(property, "DEVTYPE=", 8) == 0) {
 130                 udev_device_set_devtype(udev_device, &property[8]);
 131         } else if (strncmp(property, "DEVNAME=", 8) == 0) {
 132                 if (property[8] == '/')
 133                         udev_device_set_devnode(udev_device, &property[8]);
 134                 else
 135                         udev_device_set_knodename(udev_device, &property[8]);
 136         } else if (strncmp(property, "DEVLINKS=", 9) == 0) {
 137                 char devlinks[UTIL_PATH_SIZE];
 138                 char *slink;
 139                 char *next;
 140
 141                 util_strscpy(devlinks, sizeof(devlinks), &property[9]);
 142                 slink = devlinks;
 143                 next = strchr(slink, ' ');
 144                 while (next != NULL) {
 145                         next[0] = '\0';
 146                         udev_device_add_devlink(udev_device, slink, 0);
 147                         slink = &next[1];
 148                         next = strchr(slink, ' ');
 149                 }
 150                 if (slink[0] != '\0')
 151                         udev_device_add_devlink(udev_device, slink, 0);
 152         } else if (strncmp(property, "DRIVER=", 7) == 0) {
 153                 udev_device_set_driver(udev_device, &property[7]);
 154         } else if (strncmp(property, "ACTION=", 7) == 0) {
 155                 udev_device_set_action(udev_device, &property[7]);
 156         } else if (strncmp(property, "MAJOR=", 6) == 0) {
 157                 udev_device->maj = strtoull(&property[6], NULL, 10);
 158         } else if (strncmp(property, "MINOR=", 6) == 0) {
 159                 udev_device->min = strtoull(&property[6], NULL, 10);
 160         } else if (strncmp(property, "DEVPATH_OLD=", 12) == 0) {
 161                 udev_device_set_devpath_old(udev_device, &property[12]);
 162         } else if (strncmp(property, "SEQNUM=", 7) == 0) {
 163                 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
 164         } else if (strncmp(property, "TIMEOUT=", 8) == 0) {
 165                 udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
 166         } else {
 167                 udev_device_add_property_from_string(udev_device, property);
 168         }
 169 }
 170
 171 int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
 172 {
 173         if (udev_device->maj > 0)
 174                 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
 175         udev_device->maj = 0;
 176         udev_device->min = 0;
 177
 178         if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
 179                 return -EINVAL;
 180         return 0;
 181 }
 182
 183 /**
 184  * udev_device_get_property_value:
 185  * @udev_device: udev device
 186  * @key: property name
 187  *
 188  * Returns: the value of a device property, or #NULL if there is no such property.
 189  **/
 190 const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
 191 {
 192         struct udev_list_entry *list_entry;
 193
 194         if (udev_device == NULL)
 195                 return NULL;
 196         if (key == NULL)
 197                 return NULL;
 198
 199         list_entry = udev_device_get_properties_list_entry(udev_device);
 200         list_entry =  udev_list_entry_get_by_name(list_entry, key);
 201         return udev_list_entry_get_value(list_entry);
 202 }
 203
 204 int udev_device_read_db(struct udev_device *udev_device)
 205 {
 206         struct stat stats;
 207         char filename[UTIL_PATH_SIZE];
 208         char line[UTIL_LINE_SIZE];
 209         FILE *f;
 210
 211         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/.udev/db/",
 212                       udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
 213
 214         if (lstat(filename, &stats) != 0) {
 215                 dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
 216                 return -1;
 217         }
 218         if ((stats.st_mode & S_IFMT) == S_IFLNK) {
 219                 char target[UTIL_PATH_SIZE];
 220                 char devnode[UTIL_PATH_SIZE];
 221                 int target_len;
 222                 char *next;
 223
 224                 target_len = readlink(filename, target, sizeof(target));
 225                 if (target_len <= 0 || target_len == sizeof(target)) {
 226                         info(udev_device->udev, "error reading db link %s: %m\n", filename);
 227                         return -1;
 228                 }
 229                 target[target_len] = '\0';
 230
 231                 next = strchr(target, ' ');
 232                 if (next != NULL) {
 233                         next[0] = '\0';
 234                         next = &next[1];
 235                 }
 236                 util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL);
 237                 udev_device_set_devnode(udev_device, devnode);
 238                 while (next != NULL) {
 239                         char devlink[UTIL_PATH_SIZE];
 240                         const char *lnk;
 241
 242                         lnk = next;
 243                         next = strchr(next, ' ');
 244                         if (next != NULL) {
 245                                 next[0] = '\0';
 246                                 next = &next[1];
 247                         }
 248                         util_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL);
 249                         udev_device_add_devlink(udev_device, devlink, 0);
 250                 }
 251                 info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
 252                 return 0;
 253         }
 254
 255         f = fopen(filename, "r");
 256         if (f == NULL) {
 257                 dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
 258                 return -1;
 259         }
 260         while (fgets(line, sizeof(line), f)) {
 261                 ssize_t len;
 262                 const char *val;
 263
 264                 len = strlen(line);
 265                 if (len < 4)
 266                         break;
 267                 line[len-1] = '\0';
 268                 val = &line[2];
 269                 switch(line[0]) {
 270                 case 'N':
 271                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
 272                         udev_device_set_devnode(udev_device, filename);
 273                         break;
 274                 case 'S':
 275                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
 276                         udev_device_add_devlink(udev_device, filename, 0);
 277                         break;
 278                 case 'L':
 279                         udev_device_set_devlink_priority(udev_device, atoi(val));
 280                         break;
 281                 case 'T':
 282                         udev_device_set_event_timeout(udev_device, atoi(val));
 283                         break;
 284                 case 'E':
 285                         udev_device_add_property_from_string(udev_device, val);
 286                         break;
 287                 case 'W':
 288                         udev_device_set_watch_handle(udev_device, atoi(val));
 289                         break;
 290                 }
 291         }
 292         fclose(f);
 293
 294         info(udev_device->udev, "device %p filled with db file data\n", udev_device);
 295         return 0;
 296 }
 297
 298 int udev_device_read_uevent_file(struct udev_device *udev_device)
 299 {
 300         char filename[UTIL_PATH_SIZE];
 301         FILE *f;
 302         char line[UTIL_LINE_SIZE];
 303         int maj = 0;
 304         int min = 0;
 305
 306         util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
 307         f = fopen(filename, "r");
 308         if (f == NULL)
 309                 return -1;
 310
 311         while (fgets(line, sizeof(line), f)) {
 312                 char *pos;
 313
 314                 pos = strchr(line, '\n');
 315                 if (pos == NULL)
 316                         continue;
 317                 pos[0] = '\0';
 318
 319                 if (strncmp(line, "DEVTYPE=", 8) == 0)
 320                         udev_device_set_devtype(udev_device, &line[8]);
 321                 else if (strncmp(line, "MAJOR=", 6) == 0)
 322                         maj = strtoull(&line[6], NULL, 10);
 323                 else if (strncmp(line, "MINOR=", 6) == 0)
 324                         min = strtoull(&line[6], NULL, 10);
 325                 else if (strncmp(line, "DEVNAME=", 8) == 0)
 326                         udev_device_set_knodename(udev_device, &line[8]);
 327
 328                 udev_device_add_property_from_string(udev_device, line);
 329         }
 330
 331         udev_device->devnum = makedev(maj, min);
 332
 333         fclose(f);
 334         return 0;
 335 }
 336
 337 static void device_load_info(struct udev_device *device)
 338 {
 339         device->info_loaded = 1;
 340         udev_device_read_uevent_file(device);
 341         udev_device_read_db(device);
 342 }
 343
 344 void udev_device_set_info_loaded(struct udev_device *device)
 345 {
 346         device->info_loaded = 1;
 347 }
 348
 349 struct udev_device *udev_device_new(struct udev *udev)
 350 {
 351         struct udev_device *udev_device;
 352         struct udev_list_entry *list_entry;
 353
 354         if (udev == NULL)
 355                 return NULL;
 356
 357         udev_device = calloc(1, sizeof(struct udev_device));
 358         if (udev_device == NULL)
 359                 return NULL;
 360         udev_device->refcount = 1;
 361         udev_device->udev = udev;
 362         udev_list_init(&udev_device->devlinks_list);
 363         udev_list_init(&udev_device->properties_list);
 364         udev_list_init(&udev_device->sysattr_list);
 365         udev_device->event_timeout = -1;
 366         udev_device->watch_handle = -1;
 367         /* copy global properties */
 368         udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
 369                 udev_device_add_property(udev_device,
 370                                          udev_list_entry_get_name(list_entry),
 371                                          udev_list_entry_get_value(list_entry));
 372         dbg(udev_device->udev, "udev_device: %p created\n", udev_device);
 373         return udev_device;
 374 }
 375
 376 /**
 377  * udev_device_new_from_syspath:
 378  * @udev: udev library context
 379  * @syspath: sys device path including sys directory
 380  *
 381  * Create new udev device, and fill in information from the sys
 382  * device and the udev database entry. The syspath is the absolute
 383  * path to the device, including the sys mount point.
 384  *
 385  * The initial refcount is 1, and needs to be decremented to
 386  * release the resources of the udev device.
 387  *
 388  * Returns: a new udev device, or #NULL, if it does not exist
 389  **/
 390 struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 391 {
 392         size_t len;
 393         const char *subdir;
 394         char path[UTIL_PATH_SIZE];
 395         char *pos;
 396         struct stat statbuf;
 397         struct udev_device *udev_device;
 398
 399         if (udev == NULL)
 400                 return NULL;
 401         if (syspath == NULL)
 402                 return NULL;
 403
 404         /* path starts in sys */
 405         len = strlen(udev_get_sys_path(udev));
 406         if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
 407                 info(udev, "not in sys :%s\n", syspath);
 408                 return NULL;
 409         }
 410
 411         /* path is not a root directory */
 412         subdir = &syspath[len+1];
 413         pos = strrchr(subdir, '/');
 414         if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
 415                 dbg(udev, "not a subdir :%s\n", syspath);
 416                 return NULL;
 417         }
 418
 419         /* resolve possible symlink to real path */
 420         util_strscpy(path, sizeof(path), syspath);
 421         util_resolve_sys_link(udev, path, sizeof(path));
 422
 423         if (strncmp(&syspath[len], "/devices/", 9) == 0) {
 424                 char file[UTIL_PATH_SIZE];
 425
 426                 /* all "devices" require a "uevent" file */
 427                 util_strscpyl(file, sizeof(file), path, "/uevent", NULL);
 428                 if (stat(file, &statbuf) != 0) {
 429                         dbg(udev, "not a device: %s\n", syspath);
 430                         return NULL;
 431                 }
 432         } else {
 433                 /* everything else just needs to be a directory */
 434                 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
 435                         dbg(udev, "directory not found: %s\n", syspath);
 436                         return NULL;
 437                 }
 438         }
 439
 440         udev_device = udev_device_new(udev);
 441         if (udev_device == NULL)
 442                 return NULL;
 443
 444         udev_device_set_syspath(udev_device, path);
 445         info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 446
 447         return udev_device;
 448 }
 449
 450 /**
 451  * udev_device_new_from_devnum:
 452  * @udev: udev library context
 453  * @type: char or block device
 454  * @devnum: device major/minor number
 455  *
 456  * Create new udev device, and fill in information from the sys
 457  * device and the udev database entry. The device is looked-up
 458  * by its major/minor number and type. Character and block device
 459  * numbers are not unique across the two types.
 460  *
 461  * The initial refcount is 1, and needs to be decremented to
 462  * release the resources of the udev device.
 463  *
 464  * Returns: a new udev device, or #NULL, if it does not exist
 465  **/
 466 struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
 467 {
 468         char path[UTIL_PATH_SIZE];
 469         const char *type_str;
 470
 471         if (type == 'b')
 472                 type_str = "block";
 473         else if (type == 'c')
 474                 type_str = "char";
 475         else
 476                 return NULL;
 477
 478         /* use /sys/dev/{block,char}/<maj>:<min> link */
 479         snprintf(path, sizeof(path), "%s/dev/%s/%u:%u",
 480                  udev_get_sys_path(udev), type_str, major(devnum), minor(devnum));
 481         return udev_device_new_from_syspath(udev, path);
 482 }
 483
 484 /**
 485  * udev_device_new_from_subsystem_sysname:
 486  * @udev: udev library context
 487  * @subsystem: the subsystem of the device
 488  * @sysname: the name of the device
 489  *
 490  * Create new udev device, and fill in information from the sys device
 491  * and the udev database entry. The device is looked up by the subsystem
 492  * and name string of the device, like "mem" / "zero", or "block" / "sda".
 493  *
 494  * The initial refcount is 1, and needs to be decremented to
 495  * release the resources of the udev device.
 496  *
 497  * Returns: a new udev device, or #NULL, if it does not exist
 498  **/
 499 struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 500 {
 501         char path_full[UTIL_PATH_SIZE];
 502         char *path;
 503         size_t l;
 504         struct stat statbuf;
 505
 506         path = path_full;
 507         l = util_strpcpyl(&path, sizeof(path_full), udev_get_sys_path(udev), NULL);
 508
 509         if (strcmp(subsystem, "subsystem") == 0) {
 510                 util_strscpyl(path, l, "/subsystem/", sysname, NULL);
 511                 if (stat(path_full, &statbuf) == 0)
 512                         goto found;
 513
 514                 util_strscpyl(path, l, "/bus/", sysname, NULL);
 515                 if (stat(path_full, &statbuf) == 0)
 516                         goto found;
 517
 518                 util_strscpyl(path, l, "/class/", sysname, NULL);
 519                 if (stat(path_full, &statbuf) == 0)
 520                         goto found;
 521                 goto out;
 522         }
 523
 524         if (strcmp(subsystem, "module") == 0) {
 525                 util_strscpyl(path, l, "/module/", sysname, NULL);
 526                 if (stat(path_full, &statbuf) == 0)
 527                         goto found;
 528                 goto out;
 529         }
 530
 531         if (strcmp(subsystem, "drivers") == 0) {
 532                 char subsys[UTIL_NAME_SIZE];
 533                 char *driver;
 534
 535                 util_strscpy(subsys, sizeof(subsys), sysname);
 536                 driver = strchr(subsys, ':');
 537                 if (driver != NULL) {
 538                         driver[0] = '\0';
 539                         driver = &driver[1];
 540
 541                         util_strscpyl(path, l, "/subsystem/", subsys, "/drivers/", driver, NULL);
 542                         if (stat(path_full, &statbuf) == 0)
 543                                 goto found;
 544
 545                         util_strscpyl(path, l, "/bus/", subsys, "/drivers/", driver, NULL);
 546                         if (stat(path_full, &statbuf) == 0)
 547                                 goto found;
 548                 }
 549                 goto out;
 550         }
 551
 552         util_strscpyl(path, l, "/subsystem/", subsystem, "/devices/", sysname, NULL);
 553         if (stat(path_full, &statbuf) == 0)
 554                 goto found;
 555
 556         util_strscpyl(path, l, "/bus/", subsystem, "/devices/", sysname, NULL);
 557         if (stat(path_full, &statbuf) == 0)
 558                 goto found;
 559
 560         util_strscpyl(path, l, "/class/", subsystem, "/", sysname, NULL);
 561         if (stat(path_full, &statbuf) == 0)
 562                 goto found;
 563 out:
 564         return NULL;
 565 found:
 566         return udev_device_new_from_syspath(udev, path_full);
 567 }
 568
 569 /**
 570  * udev_device_new_from_environment
 571  * @udev: udev library context
 572  *
 573  * Create new udev device, and fill in information from the
 574  * current process environment. This only works reliable if
 575  * the process is called from a udev rule. It is usually used
 576  * for tools executed from IMPORT= rules.
 577  *
 578  * The initial refcount is 1, and needs to be decremented to
 579  * release the resources of the udev device.
 580  *
 581  * Returns: a new udev device, or #NULL, if it does not exist
 582  **/
 583 struct udev_device *udev_device_new_from_environment(struct udev *udev)
 584 {
 585         int i;
 586         struct udev_device *udev_device;
 587
 588         udev_device = udev_device_new(udev);
 589         if (udev_device == NULL)
 590                 return NULL;
 591         udev_device_set_info_loaded(udev_device);
 592
 593         for (i = 0; environ[i] != NULL; i++)
 594                 udev_device_add_property_from_string_parse(udev_device, environ[i]);
 595
 596         if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
 597                 info(udev, "missing values, invalid device\n");
 598                 udev_device_unref(udev_device);
 599                 udev_device = NULL;
 600         }
 601
 602         return udev_device;
 603 }
 604
 605 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
 606 {
 607         struct udev_device *udev_device_parent = NULL;
 608         char path[UTIL_PATH_SIZE];
 609         const char *subdir;
 610
 611         util_strscpy(path, sizeof(path), udev_device->syspath);
 612         subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
 613         for (;;) {
 614                 char *pos;
 615
 616                 pos = strrchr(subdir, '/');
 617                 if (pos == NULL || pos < &subdir[2])
 618                         break;
 619                 pos[0] = '\0';
 620                 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 621                 if (udev_device_parent != NULL)
 622                         return udev_device_parent;
 623         }
 624         return NULL;
 625 }
 626
 627 /**
 628  * udev_device_get_parent:
 629  * @udev_device: the device to start searching from
 630  *
 631  * Find the next parent device, and fill in information from the sys
 632  * device and the udev database entry.
 633  *
 634  * The returned the device is not referenced. It is attached to the
 635  * child device, and will be cleaned up when the child device
 636  * is cleaned up.
 637  *
 638  * It is not necessarily just the upper level directory, empty or not
 639  * recognized sys directories are ignored.
 640  *
 641  * It can be called as many times as needed, without caring about
 642  * references.
 643  *
 644  * Returns: a new udev device, or #NULL, if it no parent exist.
 645  **/
 646 struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 647 {
 648         if (udev_device == NULL)
 649                 return NULL;
 650         if (!udev_device->parent_set) {
 651                 udev_device->parent_set = 1;
 652                 udev_device->parent_device = device_new_from_parent(udev_device);
 653         }
 654         if (udev_device->parent_device != NULL)
 655                 dbg(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
 656         return udev_device->parent_device;
 657 }
 658
 659 /**
 660  * udev_device_get_parent_with_subsystem_devtype:
 661  * @udev_device: udev device to start searching from
 662  * @subsystem: the subsystem of the device
 663  * @devtype: the type (DEVTYPE) of the device
 664  *
 665  * Find the next parent device, with a matching subsystem and devtype
 666  * value, and fill in information from the sys device and the udev
 667  * database entry.
 668  *
 669  * If devtype is #NULL, only subsystem is checked, and any devtype will
 670  * match.
 671  *
 672  * The returned the device is not referenced. It is attached to the
 673  * child device, and will be cleaned up when the child device
 674  * is cleaned up.
 675  *
 676  * It can be called as many times as needed, without caring about
 677  * references.
 678  *
 679  * Returns: a new udev device, or #NULL if no matching parent exists.
 680  **/
 681 struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
 682 {
 683         struct udev_device *parent;
 684
 685         if (subsystem == NULL)
 686                 return NULL;
 687
 688         parent = udev_device_get_parent(udev_device);
 689         while (parent != NULL) {
 690                 const char *parent_subsystem;
 691                 const char *parent_devtype;
 692
 693                 parent_subsystem = udev_device_get_subsystem(parent);
 694                 if (parent_subsystem != NULL && strcmp(parent_subsystem, subsystem) == 0) {
 695                         if (devtype == NULL)
 696                                 break;
 697                         parent_devtype = udev_device_get_devtype(parent);
 698                         if (parent_devtype != NULL && strcmp(parent_devtype, devtype) == 0)
 699                                 break;
 700                 }
 701                 parent = udev_device_get_parent(parent);
 702         }
 703         return parent;
 704 }
 705
 706 /**
 707  * udev_device_get_udev:
 708  * @udev_device: udev device
 709  *
 710  * Retrieve the udev library context the device was created with.
 711  *
 712  * Returns: the udev library context
 713  **/
 714 struct udev *udev_device_get_udev(struct udev_device *udev_device)
 715 {
 716         if (udev_device == NULL)
 717                 return NULL;
 718         return udev_device->udev;
 719 }
 720
 721 /**
 722  * udev_device_ref:
 723  * @udev_device: udev device
 724  *
 725  * Take a reference of a udev device.
 726  *
 727  * Returns: the passed udev device
 728  **/
 729 struct udev_device *udev_device_ref(struct udev_device *udev_device)
 730 {
 731         if (udev_device == NULL)
 732                 return NULL;
 733         udev_device->refcount++;
 734         return udev_device;
 735 }
 736
 737 /**
 738  * udev_device_unref:
 739  * @udev_device: udev device
 740  *
 741  * Drop a reference of a udev device. If the refcount reaches zero,
 742  * the resources of the device will be released.
 743  *
 744  **/
 745 void udev_device_unref(struct udev_device *udev_device)
 746 {
 747         if (udev_device == NULL)
 748                 return;
 749         udev_device->refcount--;
 750         if (udev_device->refcount > 0)
 751                 return;
 752         if (udev_device->parent_device != NULL)
 753                 udev_device_unref(udev_device->parent_device);
 754         free(udev_device->syspath);
 755         free(udev_device->sysname);
 756         free(udev_device->devnode);
 757         free(udev_device->subsystem);
 758         free(udev_device->devtype);
 759         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 760         udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
 761         free(udev_device->action);
 762         free(udev_device->driver);
 763         free(udev_device->devpath_old);
 764         free(udev_device->sysname_old);
 765         free(udev_device->knodename);
 766         udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
 767         free(udev_device->envp);
 768         free(udev_device->monitor_buf);
 769         dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
 770         free(udev_device);
 771 }
 772
 773 /**
 774  * udev_device_get_devpath:
 775  * @udev_device: udev device
 776  *
 777  * Retrieve the kernel devpath value of the udev device. The path
 778  * does not contain the sys mount point, and starts with a '/'.
 779  *
 780  * Returns: the devpath of the udev device
 781  **/
 782 const char *udev_device_get_devpath(struct udev_device *udev_device)
 783 {
 784         if (udev_device == NULL)
 785                 return NULL;
 786         return udev_device->devpath;
 787 }
 788
 789 /**
 790  * udev_device_get_syspath:
 791  * @udev_device: udev device
 792  *
 793  * Retrieve the sys path of the udev device. The path is an
 794  * absolute path and starts with the sys mount point.
 795  *
 796  * Returns: the sys path of the udev device
 797  **/
 798 const char *udev_device_get_syspath(struct udev_device *udev_device)
 799 {
 800         if (udev_device == NULL)
 801                 return NULL;
 802         return udev_device->syspath;
 803 }
 804
 805 /**
 806  * udev_device_get_sysname:
 807  * @udev_device: udev device
 808  *
 809  * Returns: the sys name of the device device
 810  **/
 811 const char *udev_device_get_sysname(struct udev_device *udev_device)
 812 {
 813         if (udev_device == NULL)
 814                 return NULL;
 815         return udev_device->sysname;
 816 }
 817
 818 /**
 819  * udev_device_get_sysnum:
 820  * @udev_device: udev device
 821  *
 822  * Returns: the trailing number of of the device name
 823  **/
 824 const char *udev_device_get_sysnum(struct udev_device *udev_device)
 825 {
 826         if (udev_device == NULL)
 827                 return NULL;
 828         return udev_device->sysnum;
 829 }
 830
 831 /**
 832  * udev_device_get_devnode:
 833  * @udev_device: udev device
 834  *
 835  * Retrieve the device node file name belonging to the udev device.
 836  * The path is an absolute path, and starts with the device directory.
 837  *
 838  * Returns: the device node file name of the udev device, or #NULL if no device node exists
 839  **/
 840 const char *udev_device_get_devnode(struct udev_device *udev_device)
 841 {
 842         if (udev_device == NULL)
 843                 return NULL;
 844         if (!udev_device->info_loaded)
 845                 device_load_info(udev_device);
 846         return udev_device->devnode;
 847 }
 848
 849 /**
 850  * udev_device_get_subsystem:
 851  * @udev_device: udev device
 852  *
 853  * Retrieve the subsystem string of the udev device. The string does not
 854  * contain any "/".
 855  *
 856  * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
 857  **/
 858 const char *udev_device_get_subsystem(struct udev_device *udev_device)
 859 {
 860         char subsystem[UTIL_NAME_SIZE];
 861
 862         if (udev_device == NULL)
 863                 return NULL;
 864         if (!udev_device->subsystem_set) {
 865                 udev_device->subsystem_set = 1;
 866                 /* read "subsystem" link */
 867                 if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
 868                         udev_device_set_subsystem(udev_device, subsystem);
 869                         return udev_device->subsystem;
 870                 }
 871                 /* implicit names */
 872                 if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
 873                         udev_device_set_subsystem(udev_device, "module");
 874                         return udev_device->subsystem;
 875                 }
 876                 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
 877                         udev_device_set_subsystem(udev_device, "drivers");
 878                         return udev_device->subsystem;
 879                 }
 880                 if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
 881                     strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 882                     strncmp(udev_device->devpath, "/bus/", 5) == 0) {
 883                         udev_device_set_subsystem(udev_device, "subsystem");
 884                         return udev_device->subsystem;
 885                 }
 886         }
 887         return udev_device->subsystem;
 888 }
 889
 890 /**
 891  * udev_device_get_devtype:
 892  * @udev_device: udev device
 893  *
 894  * Retrieve the devtype string of the udev device.
 895  *
 896  * Returns: the devtype name of the udev device, or #NULL if it can not be determined
 897  **/
 898 const char *udev_device_get_devtype(struct udev_device *udev_device)
 899 {
 900         if (udev_device == NULL)
 901                 return NULL;
 902         if (!udev_device->devtype_set) {
 903                 udev_device->devtype_set = 1;
 904                 if (!udev_device->info_loaded)
 905                         udev_device_read_uevent_file(udev_device);
 906         }
 907         return udev_device->devtype;
 908 }
 909
 910 /**
 911  * udev_device_get_devlinks_list_entry:
 912  * @udev_device: udev device
 913  *
 914  * Retrieve the list of device links pointing to the device file of
 915  * the udev device. The next list entry can be retrieved with
 916  * udev_list_entry_next(), which returns #NULL if no more entries exist.
 917  * The devlink path can be retrieved from the list entry by
 918  * udev_list_entry_get_name(). The path is an absolute path, and starts with
 919  * the device directory.
 920  *
 921  * Returns: the first entry of the device node link list
 922  **/
 923 struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
 924 {
 925         if (udev_device == NULL)
 926                 return NULL;
 927         if (!udev_device->info_loaded)
 928                 device_load_info(udev_device);
 929         return udev_list_get_entry(&udev_device->devlinks_list);
 930 }
 931
 932 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
 933 {
 934         udev_device->devlinks_uptodate = 0;
 935         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 936 }
 937
 938 /**
 939  * udev_device_get_properties_list_entry:
 940  * @udev_device: udev device
 941  *
 942  * Retrieve the list of key/value device properties of the udev
 943  * device. The next list entry can be retrieved with udev_list_entry_next(),
 944  * which returns #NULL if no more entries exist. The property name
 945  * can be retrieved from the list entry by udev_list_get_name(),
 946  * the property value by udev_list_get_value().
 947  *
 948  * Returns: the first entry of the property list
 949  **/
 950 struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
 951 {
 952         if (udev_device == NULL)
 953                 return NULL;
 954         if (!udev_device->info_loaded)
 955                 device_load_info(udev_device);
 956         if (!udev_device->devlinks_uptodate) {
 957                 char symlinks[UTIL_PATH_SIZE];
 958                 struct udev_list_entry *list_entry;
 959
 960                 udev_device->devlinks_uptodate = 1;
 961                 list_entry = udev_device_get_devlinks_list_entry(udev_device);
 962                 if (list_entry != NULL) {
 963                         char *s;
 964                         size_t l;
 965
 966                         s = symlinks;
 967                         l = util_strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
 968                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 969                                 l = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
 970                         udev_device_add_property(udev_device, "DEVLINKS", symlinks);
 971                 }
 972         }
 973         return udev_list_get_entry(&udev_device->properties_list);
 974 }
 975
 976 /**
 977  * udev_device_get_driver:
 978  * @udev_device: udev device
 979  *
 980  * Returns: the driver string, or #NULL if there is no driver attached.
 981  **/
 982 const char *udev_device_get_driver(struct udev_device *udev_device)
 983 {
 984         char driver[UTIL_NAME_SIZE];
 985
 986         if (udev_device == NULL)
 987                 return NULL;
 988         if (!udev_device->driver_set) {
 989                 udev_device->driver_set = 1;
 990                 if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
 991                         udev_device->driver = strdup(driver);
 992         }
 993         return udev_device->driver;
 994 }
 995
 996 /**
 997  * udev_device_get_devnum:
 998  * @udev_device: udev device
 999  *
1000  * Returns: the device major/minor number.
1001  **/
1002 dev_t udev_device_get_devnum(struct udev_device *udev_device)
1003 {
1004         if (udev_device == NULL)
1005                 return makedev(0, 0);
1006         if (!udev_device->info_loaded)
1007                 device_load_info(udev_device);
1008         return udev_device->devnum;
1009 }
1010
1011 /**
1012  * udev_device_get_action:
1013  * @udev_device: udev device
1014  *
1015  * This is only valid if the device was received through a monitor. Devices read from
1016  * sys do not have an action string. Usual actions are: add, remove, change, online,
1017  * offline.
1018  *
1019  * Returns: the kernel action value, or #NULL if there is no action value available.
1020  **/
1021 const char *udev_device_get_action(struct udev_device *udev_device)
1022 {
1023         if (udev_device == NULL)
1024                 return NULL;
1025         return udev_device->action;
1026 }
1027
1028 /**
1029  * udev_device_get_devnum:
1030  * @udev_device: udev device
1031  *
1032  * This is only valid if the device was received through a monitor. Devices read from
1033  * sys do not have a sequence number.
1034  *
1035  * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
1036  **/
1037 unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
1038 {
1039         if (udev_device == NULL)
1040                 return 0;
1041         return udev_device->seqnum;
1042 }
1043
1044 /**
1045  * udev_device_get_sysattr_value:
1046  * @udev_device: udev device
1047  * @sysattr: attribute name
1048  *
1049  * The retrieved value is cached in the device. Repeated calls will return the same
1050  * value and not open the attribute again.
1051  *
1052  * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1053  **/
1054 const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1055 {
1056         struct udev_list_entry *list_entry;
1057         char path[UTIL_PATH_SIZE];
1058         char value[4096];
1059         struct stat statbuf;
1060         int fd;
1061         ssize_t size;
1062         const char *val = NULL;
1063
1064         if (udev_device == NULL)
1065                 return NULL;
1066         if (sysattr == NULL)
1067                 return NULL;
1068
1069         /* look for possibly already cached result */
1070         udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
1071                 if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
1072                         dbg(udev_device->udev, "got '%s' (%s) from cache\n",
1073                             sysattr, udev_list_entry_get_value(list_entry));
1074                         return udev_list_entry_get_value(list_entry);
1075                 }
1076         }
1077
1078         util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1079         if (lstat(path, &statbuf) != 0) {
1080                 dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
1081                 udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
1082                 goto out;
1083         }
1084
1085         if (S_ISLNK(statbuf.st_mode)) {
1086                 char target[UTIL_NAME_SIZE];
1087                 int len;
1088                 char *pos;
1089
1090                 /* some core links return the last element of the target path */
1091                 if (strcmp(sysattr, "driver") != 0 &&
1092                     strcmp(sysattr, "subsystem") != 0 &&
1093                     strcmp(sysattr, "module") != 0)
1094                         goto out;
1095
1096                 len = readlink(path, target, sizeof(target));
1097                 if (len <= 0 || len == sizeof(target))
1098                         goto out;
1099                 target[len] = '\0';
1100
1101                 pos = strrchr(target, '/');
1102                 if (pos != NULL) {
1103                         pos = &pos[1];
1104                         dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
1105                         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
1106                         val = udev_list_entry_get_value(list_entry);
1107                 }
1108
1109                 goto out;
1110         }
1111
1112         /* skip directories */
1113         if (S_ISDIR(statbuf.st_mode))
1114                 goto out;
1115
1116         /* skip non-readable files */
1117         if ((statbuf.st_mode & S_IRUSR) == 0)
1118                 goto out;
1119
1120         /* read attribute value */
1121         fd = open(path, O_RDONLY);
1122         if (fd < 0) {
1123                 dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
1124                 goto out;
1125         }
1126         size = read(fd, value, sizeof(value));
1127         close(fd);
1128         if (size < 0)
1129                 goto out;
1130         if (size == sizeof(value))
1131                 goto out;
1132
1133         /* got a valid value, store it in cache and return it */
1134         value[size] = '\0';
1135         util_remove_trailing_chars(value, '\n');
1136         dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
1137         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
1138         val = udev_list_entry_get_value(list_entry);
1139 out:
1140         return val;
1141 }
1142
1143 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
1144 {
1145         const char *pos;
1146         size_t len;
1147
1148         free(udev_device->syspath);
1149         udev_device->syspath = strdup(syspath);
1150         if (udev_device->syspath ==  NULL)
1151                 return -ENOMEM;
1152         udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
1153         udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
1154
1155         pos = strrchr(udev_device->syspath, '/');
1156         if (pos == NULL)
1157                 return -EINVAL;
1158         udev_device->sysname = strdup(&pos[1]);
1159         if (udev_device->sysname == NULL)
1160                 return -ENOMEM;
1161
1162         /* some devices have '!' in their name, change that to '/' */
1163         len = 0;
1164         while (udev_device->sysname[len] != '\0') {
1165                 if (udev_device->sysname[len] == '!')
1166                         udev_device->sysname[len] = '/';
1167                 len++;
1168         }
1169
1170         /* trailing number */
1171         while (len > 0 && isdigit(udev_device->sysname[--len]))
1172                 udev_device->sysnum = &udev_device->sysname[len];
1173
1174         /* sysname is completely numeric */
1175         if (len == 0)
1176                 udev_device->sysnum = NULL;
1177
1178         return 0;
1179 }
1180
1181 int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
1182 {
1183         free(udev_device->subsystem);
1184         udev_device->subsystem = strdup(subsystem);
1185         if (udev_device->subsystem == NULL)
1186                 return -ENOMEM;
1187         udev_device->subsystem_set = 1;
1188         udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
1189         return 0;
1190 }
1191
1192 int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
1193 {
1194         free(udev_device->devtype);
1195         udev_device->devtype = strdup(devtype);
1196         if (udev_device->devtype == NULL)
1197                 return -ENOMEM;
1198         udev_device->devtype_set = 1;
1199         udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
1200         return 0;
1201 }
1202
1203 int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1204 {
1205         free(udev_device->devnode);
1206         udev_device->devnode = strdup(devnode);
1207         if (devnode == NULL)
1208                 return 0;
1209         if (udev_device->devnode == NULL)
1210                 return -ENOMEM;
1211         udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1212         return 0;
1213 }
1214
1215 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink, int unique)
1216 {
1217         struct udev_list_entry *list_entry;
1218
1219         udev_device->devlinks_uptodate = 0;
1220         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0);
1221         if (list_entry == NULL)
1222                 return -ENOMEM;
1223         if (unique)
1224                 udev_list_entry_set_flags(list_entry, 1);
1225         return 0;
1226 }
1227
1228 #define ENVP_SIZE                       128
1229 #define MONITOR_BUF_SIZE                4096
1230 static int update_envp_monitor_buf(struct udev_device *udev_device)
1231 {
1232         struct udev_list_entry *list_entry;
1233         char *s;
1234         size_t l;
1235         unsigned int i;
1236
1237         /* monitor buffer of property strings */
1238         free(udev_device->monitor_buf);
1239         udev_device->monitor_buf_len = 0;
1240         udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1241         if (udev_device->monitor_buf == NULL)
1242                 return -ENOMEM;
1243
1244         /* envp array, strings will point into monitor buffer */
1245         if (udev_device->envp == NULL)
1246                 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1247         if (udev_device->envp == NULL)
1248                 return -ENOMEM;
1249
1250         i = 0;
1251         s = udev_device->monitor_buf;
1252         l = MONITOR_BUF_SIZE;
1253         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1254                 const char *key;
1255
1256                 key = udev_list_entry_get_name(list_entry);
1257                 /* skip private variables */
1258                 if (key[0] == '.')
1259                         continue;
1260
1261                 /* add string to envp array */
1262                 udev_device->envp[i++] = s;
1263                 if (i+1 >= ENVP_SIZE)
1264                         return -EINVAL;
1265
1266                 /* add property string to monitor buffer */
1267                 l = util_strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1268                 if (l == 0)
1269                         return -EINVAL;
1270                 /* advance past the trailing '\0' that util_strpcpyl() guarantees */
1271                 s++;
1272                 l--;
1273         }
1274         udev_device->envp[i] = NULL;
1275         udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1276         udev_device->envp_uptodate = 1;
1277         dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n",
1278             i, udev_device->monitor_buf_len);
1279         return 0;
1280 }
1281
1282 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1283 {
1284         if (!udev_device->envp_uptodate)
1285                 if (update_envp_monitor_buf(udev_device) != 0)
1286                         return NULL;
1287         return udev_device->envp;
1288 }
1289
1290 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1291 {
1292         if (!udev_device->envp_uptodate)
1293                 if (update_envp_monitor_buf(udev_device) != 0)
1294                         return -EINVAL;
1295         *buf = udev_device->monitor_buf;
1296         return udev_device->monitor_buf_len;
1297 }
1298
1299 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1300 {
1301         free(udev_device->action);
1302         udev_device->action = strdup(action);
1303         if (udev_device->action == NULL)
1304                 return -ENOMEM;
1305         udev_device_add_property(udev_device, "ACTION", udev_device->action);
1306         return 0;
1307 }
1308
1309 int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
1310 {
1311         free(udev_device->driver);
1312         udev_device->driver = strdup(driver);
1313         if (udev_device->driver == NULL)
1314                 return -ENOMEM;
1315         udev_device->driver_set = 1;
1316         udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
1317         return 0;
1318 }
1319
1320 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
1321 {
1322         return udev_device->devpath_old;
1323 }
1324
1325 int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
1326 {
1327         const char *pos;
1328         size_t len;
1329
1330         free(udev_device->devpath_old);
1331         udev_device->devpath_old = strdup(devpath_old);
1332         if (udev_device->devpath_old == NULL)
1333                 return -ENOMEM;
1334         udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
1335
1336         pos = strrchr(udev_device->devpath_old, '/');
1337         if (pos == NULL)
1338                 return -EINVAL;
1339         udev_device->sysname_old = strdup(&pos[1]);
1340         if (udev_device->sysname_old == NULL)
1341                 return -ENOMEM;
1342
1343         /* some devices have '!' in their name, change that to '/' */
1344         len = 0;
1345         while (udev_device->sysname_old[len] != '\0') {
1346                 if (udev_device->sysname_old[len] == '!')
1347                         udev_device->sysname_old[len] = '/';
1348                 len++;
1349         }
1350         return 0;
1351 }
1352
1353 const char *udev_device_get_sysname_old(struct udev_device *udev_device)
1354 {
1355         if (udev_device == NULL)
1356                 return NULL;
1357         return udev_device->sysname_old;
1358 }
1359
1360 const char *udev_device_get_knodename(struct udev_device *udev_device)
1361 {
1362         return udev_device->knodename;
1363 }
1364
1365 int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
1366 {
1367         free(udev_device->knodename);
1368         udev_device->knodename = strdup(knodename);
1369         if (udev_device->knodename == NULL)
1370                 return -ENOMEM;
1371         udev_device_add_property(udev_device, "DEVNAME", udev_device->knodename);
1372         return 0;
1373 }
1374
1375 int udev_device_get_timeout(struct udev_device *udev_device)
1376 {
1377         return udev_device->timeout;
1378 }
1379
1380 int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
1381 {
1382         udev_device->timeout = timeout;
1383         return 0;
1384 }
1385 int udev_device_get_event_timeout(struct udev_device *udev_device)
1386 {
1387         if (!udev_device->info_loaded)
1388                 device_load_info(udev_device);
1389         return udev_device->event_timeout;
1390 }
1391
1392 int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
1393 {
1394         udev_device->event_timeout = event_timeout;
1395         return 0;
1396 }
1397
1398 int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
1399 {
1400         char num[32];
1401
1402         udev_device->seqnum = seqnum;
1403         snprintf(num, sizeof(num), "%llu", seqnum);
1404         udev_device_add_property(udev_device, "SEQNUM", num);
1405         return 0;
1406 }
1407
1408 int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
1409 {
1410         char num[32];
1411
1412         udev_device->devnum = devnum;
1413
1414         snprintf(num, sizeof(num), "%u", major(devnum));
1415         udev_device_add_property(udev_device, "MAJOR", num);
1416         snprintf(num, sizeof(num), "%u", minor(devnum));
1417         udev_device_add_property(udev_device, "MINOR", num);
1418         return 0;
1419 }
1420
1421 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1422 {
1423         if (!udev_device->info_loaded)
1424                 device_load_info(udev_device);
1425         return udev_device->devlink_priority;
1426 }
1427
1428 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1429 {
1430          udev_device->devlink_priority = prio;
1431         return 0;
1432 }
1433
1434 int udev_device_get_watch_handle(struct udev_device *udev_device)
1435 {
1436         if (!udev_device->info_loaded)
1437                 device_load_info(udev_device);
1438         return udev_device->watch_handle;
1439 }
1440
1441 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1442 {
1443         udev_device->watch_handle = handle;
1444         return 0;
1445 }