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         struct udev_list_node tags_list;
  64         unsigned long long int seqnum;
  65         int event_timeout;
  66         int timeout;
  67         int devlink_priority;
  68         int refcount;
  69         dev_t devnum;
  70         int watch_handle;
  71         int maj, min;
  72         bool parent_set;
  73         bool subsystem_set;
  74         bool devtype_set;
  75         bool devlinks_uptodate;
  76         bool envp_uptodate;
  77         bool tags_uptodate;
  78         bool driver_set;
  79         bool info_loaded;
  80         bool db_loaded;
  81         bool uevent_loaded;
  82 };
  83
  84 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
  85 {
  86         udev_device->envp_uptodate = false;
  87         if (value == NULL) {
  88                 struct udev_list_entry *list_entry;
  89
  90                 list_entry = udev_device_get_properties_list_entry(udev_device);
  91                 list_entry = udev_list_entry_get_by_name(list_entry, key);
  92                 if (list_entry != NULL)
  93                         udev_list_entry_delete(list_entry);
  94                 return NULL;
  95         }
  96         return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
  97 }
  98
  99 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
 100 {
 101         char name[UTIL_LINE_SIZE];
 102         char *val;
 103
 104         util_strscpy(name, sizeof(name), property);
 105         val = strchr(name, '=');
 106         if (val == NULL)
 107                 return NULL;
 108         val[0] = '\0';
 109         val = &val[1];
 110         if (val[0] == '\0')
 111                 val = NULL;
 112         return udev_device_add_property(udev_device, name, val);
 113 }
 114
 115 /*
 116  * parse property string, and if needed, update internal values accordingly
 117  *
 118  * udev_device_add_property_from_string_parse_finish() needs to be
 119  * called after adding properties, and its return value checked
 120  *
 121  * udev_device_set_info_loaded() needs to be set, to avoid trying
 122  * to use a device without a DEVPATH set
 123  */
 124 void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
 125 {
 126         if (strncmp(property, "DEVPATH=", 8) == 0) {
 127                 char path[UTIL_PATH_SIZE];
 128
 129                 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_device->udev), &property[8], NULL);
 130                 udev_device_set_syspath(udev_device, path);
 131         } else if (strncmp(property, "SUBSYSTEM=", 10) == 0) {
 132                 udev_device_set_subsystem(udev_device, &property[10]);
 133         } else if (strncmp(property, "DEVTYPE=", 8) == 0) {
 134                 udev_device_set_devtype(udev_device, &property[8]);
 135         } else if (strncmp(property, "DEVNAME=", 8) == 0) {
 136                 if (property[8] == '/')
 137                         udev_device_set_devnode(udev_device, &property[8]);
 138                 else
 139                         udev_device_set_knodename(udev_device, &property[8]);
 140         } else if (strncmp(property, "DEVLINKS=", 9) == 0) {
 141                 char devlinks[UTIL_PATH_SIZE];
 142                 char *slink;
 143                 char *next;
 144
 145                 util_strscpy(devlinks, sizeof(devlinks), &property[9]);
 146                 slink = devlinks;
 147                 next = strchr(slink, ' ');
 148                 while (next != NULL) {
 149                         next[0] = '\0';
 150                         udev_device_add_devlink(udev_device, slink, 0);
 151                         slink = &next[1];
 152                         next = strchr(slink, ' ');
 153                 }
 154                 if (slink[0] != '\0')
 155                         udev_device_add_devlink(udev_device, slink, 0);
 156         } else if (strncmp(property, "TAGS=", 5) == 0) {
 157                 char tags[UTIL_PATH_SIZE];
 158                 char *next;
 159
 160                 util_strscpy(tags, sizeof(tags), &property[5]);
 161                 next = strchr(tags, ':');
 162                 if (next != NULL) {
 163                         next++;
 164                         while (next[0] != '\0') {
 165                                 char *tag;
 166
 167                                 tag = next;
 168                                 next = strchr(tag, ':');
 169                                 if (next == NULL)
 170                                         break;
 171                                 next[0] = '\0';
 172                                 next++;
 173                                 udev_device_add_tag(udev_device, tag);
 174                         }
 175                 }
 176         } else if (strncmp(property, "DRIVER=", 7) == 0) {
 177                 udev_device_set_driver(udev_device, &property[7]);
 178         } else if (strncmp(property, "ACTION=", 7) == 0) {
 179                 udev_device_set_action(udev_device, &property[7]);
 180         } else if (strncmp(property, "MAJOR=", 6) == 0) {
 181                 udev_device->maj = strtoull(&property[6], NULL, 10);
 182         } else if (strncmp(property, "MINOR=", 6) == 0) {
 183                 udev_device->min = strtoull(&property[6], NULL, 10);
 184         } else if (strncmp(property, "DEVPATH_OLD=", 12) == 0) {
 185                 udev_device_set_devpath_old(udev_device, &property[12]);
 186         } else if (strncmp(property, "SEQNUM=", 7) == 0) {
 187                 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
 188         } else if (strncmp(property, "TIMEOUT=", 8) == 0) {
 189                 udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
 190         } else {
 191                 udev_device_add_property_from_string(udev_device, property);
 192         }
 193 }
 194
 195 int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
 196 {
 197         if (udev_device->maj > 0)
 198                 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
 199         udev_device->maj = 0;
 200         udev_device->min = 0;
 201
 202         if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
 203                 return -EINVAL;
 204         return 0;
 205 }
 206
 207 /**
 208  * udev_device_get_property_value:
 209  * @udev_device: udev device
 210  * @key: property name
 211  *
 212  * Returns: the value of a device property, or #NULL if there is no such property.
 213  **/
 214 const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
 215 {
 216         struct udev_list_entry *list_entry;
 217
 218         if (udev_device == NULL)
 219                 return NULL;
 220         if (key == NULL)
 221                 return NULL;
 222
 223         list_entry = udev_device_get_properties_list_entry(udev_device);
 224         list_entry =  udev_list_entry_get_by_name(list_entry, key);
 225         return udev_list_entry_get_value(list_entry);
 226 }
 227
 228 int udev_device_read_db(struct udev_device *udev_device)
 229 {
 230         struct stat stats;
 231         char filename[UTIL_PATH_SIZE];
 232         char line[UTIL_LINE_SIZE];
 233         FILE *f;
 234
 235         if (udev_device->db_loaded)
 236                 return 0;
 237
 238         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/.udev/db/",
 239                       udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
 240
 241         if (lstat(filename, &stats) != 0) {
 242                 dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
 243                 return -1;
 244         }
 245         if ((stats.st_mode & S_IFMT) == S_IFLNK) {
 246                 char target[UTIL_PATH_SIZE];
 247                 char devnode[UTIL_PATH_SIZE];
 248                 int target_len;
 249                 char *next;
 250
 251                 target_len = readlink(filename, target, sizeof(target));
 252                 if (target_len <= 0 || target_len == sizeof(target)) {
 253                         info(udev_device->udev, "error reading db link %s: %m\n", filename);
 254                         return -1;
 255                 }
 256                 target[target_len] = '\0';
 257
 258                 next = strchr(target, ' ');
 259                 if (next != NULL) {
 260                         next[0] = '\0';
 261                         next = &next[1];
 262                 }
 263                 util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL);
 264                 udev_device_set_devnode(udev_device, devnode);
 265                 while (next != NULL) {
 266                         char devlink[UTIL_PATH_SIZE];
 267                         const char *lnk;
 268
 269                         lnk = next;
 270                         next = strchr(next, ' ');
 271                         if (next != NULL) {
 272                                 next[0] = '\0';
 273                                 next = &next[1];
 274                         }
 275                         util_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL);
 276                         udev_device_add_devlink(udev_device, devlink, 0);
 277                 }
 278                 info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
 279                 return 0;
 280         }
 281
 282         f = fopen(filename, "r");
 283         if (f == NULL) {
 284                 dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
 285                 return -1;
 286         }
 287         while (fgets(line, sizeof(line), f)) {
 288                 ssize_t len;
 289                 const char *val;
 290
 291                 len = strlen(line);
 292                 if (len < 4)
 293                         break;
 294                 line[len-1] = '\0';
 295                 val = &line[2];
 296                 switch(line[0]) {
 297                 case 'N':
 298                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
 299                         udev_device_set_devnode(udev_device, filename);
 300                         break;
 301                 case 'S':
 302                         util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
 303                         udev_device_add_devlink(udev_device, filename, 0);
 304                         break;
 305                 case 'L':
 306                         udev_device_set_devlink_priority(udev_device, atoi(val));
 307                         break;
 308                 case 'T':
 309                         udev_device_set_event_timeout(udev_device, atoi(val));
 310                         break;
 311                 case 'E':
 312                         udev_device_add_property_from_string(udev_device, val);
 313                         break;
 314                 case 'G':
 315                         udev_device_add_tag(udev_device, val);
 316                         break;
 317                 case 'W':
 318                         udev_device_set_watch_handle(udev_device, atoi(val));
 319                         break;
 320                 }
 321         }
 322         fclose(f);
 323
 324         info(udev_device->udev, "device %p filled with db file data\n", udev_device);
 325         udev_device->db_loaded = true;
 326         return 0;
 327 }
 328
 329 int udev_device_read_uevent_file(struct udev_device *udev_device)
 330 {
 331         char filename[UTIL_PATH_SIZE];
 332         FILE *f;
 333         char line[UTIL_LINE_SIZE];
 334         int maj = 0;
 335         int min = 0;
 336
 337         if (udev_device->uevent_loaded)
 338                 return 0;
 339
 340         util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
 341         f = fopen(filename, "r");
 342         if (f == NULL)
 343                 return -1;
 344
 345         while (fgets(line, sizeof(line), f)) {
 346                 char *pos;
 347
 348                 pos = strchr(line, '\n');
 349                 if (pos == NULL)
 350                         continue;
 351                 pos[0] = '\0';
 352
 353                 if (strncmp(line, "DEVTYPE=", 8) == 0)
 354                         udev_device_set_devtype(udev_device, &line[8]);
 355                 else if (strncmp(line, "MAJOR=", 6) == 0)
 356                         maj = strtoull(&line[6], NULL, 10);
 357                 else if (strncmp(line, "MINOR=", 6) == 0)
 358                         min = strtoull(&line[6], NULL, 10);
 359                 else if (strncmp(line, "DEVNAME=", 8) == 0)
 360                         udev_device_set_knodename(udev_device, &line[8]);
 361
 362                 udev_device_add_property_from_string(udev_device, line);
 363         }
 364
 365         udev_device->devnum = makedev(maj, min);
 366         fclose(f);
 367         udev_device->uevent_loaded = true;
 368         return 0;
 369 }
 370
 371 void udev_device_set_info_loaded(struct udev_device *device)
 372 {
 373         device->info_loaded = true;
 374 }
 375
 376 struct udev_device *udev_device_new(struct udev *udev)
 377 {
 378         struct udev_device *udev_device;
 379         struct udev_list_entry *list_entry;
 380
 381         if (udev == NULL)
 382                 return NULL;
 383
 384         udev_device = calloc(1, sizeof(struct udev_device));
 385         if (udev_device == NULL)
 386                 return NULL;
 387         udev_device->refcount = 1;
 388         udev_device->udev = udev;
 389         udev_list_init(&udev_device->devlinks_list);
 390         udev_list_init(&udev_device->properties_list);
 391         udev_list_init(&udev_device->sysattr_list);
 392         udev_list_init(&udev_device->tags_list);
 393         udev_device->event_timeout = -1;
 394         udev_device->watch_handle = -1;
 395         /* copy global properties */
 396         udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
 397                 udev_device_add_property(udev_device,
 398                                          udev_list_entry_get_name(list_entry),
 399                                          udev_list_entry_get_value(list_entry));
 400         dbg(udev_device->udev, "udev_device: %p created\n", udev_device);
 401         return udev_device;
 402 }
 403
 404 /**
 405  * udev_device_new_from_syspath:
 406  * @udev: udev library context
 407  * @syspath: sys device path including sys directory
 408  *
 409  * Create new udev device, and fill in information from the sys
 410  * device and the udev database entry. The syspath is the absolute
 411  * path to the device, including the sys mount point.
 412  *
 413  * The initial refcount is 1, and needs to be decremented to
 414  * release the resources of the udev device.
 415  *
 416  * Returns: a new udev device, or #NULL, if it does not exist
 417  **/
 418 struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 419 {
 420         size_t len;
 421         const char *subdir;
 422         char path[UTIL_PATH_SIZE];
 423         char *pos;
 424         struct stat statbuf;
 425         struct udev_device *udev_device;
 426
 427         if (udev == NULL)
 428                 return NULL;
 429         if (syspath == NULL)
 430                 return NULL;
 431
 432         /* path starts in sys */
 433         len = strlen(udev_get_sys_path(udev));
 434         if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
 435                 info(udev, "not in sys :%s\n", syspath);
 436                 return NULL;
 437         }
 438
 439         /* path is not a root directory */
 440         subdir = &syspath[len+1];
 441         pos = strrchr(subdir, '/');
 442         if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
 443                 dbg(udev, "not a subdir :%s\n", syspath);
 444                 return NULL;
 445         }
 446
 447         /* resolve possible symlink to real path */
 448         util_strscpy(path, sizeof(path), syspath);
 449         util_resolve_sys_link(udev, path, sizeof(path));
 450
 451         if (strncmp(&path[len], "/devices/", 9) == 0) {
 452                 char file[UTIL_PATH_SIZE];
 453
 454                 /* all "devices" require a "uevent" file */
 455                 util_strscpyl(file, sizeof(file), path, "/uevent", NULL);
 456                 if (stat(file, &statbuf) != 0) {
 457                         dbg(udev, "not a device: %s\n", syspath);
 458                         return NULL;
 459                 }
 460         } else {
 461                 /* everything else just needs to be a directory */
 462                 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
 463                         dbg(udev, "directory not found: %s\n", syspath);
 464                         return NULL;
 465                 }
 466         }
 467
 468         udev_device = udev_device_new(udev);
 469         if (udev_device == NULL)
 470                 return NULL;
 471
 472         udev_device_set_syspath(udev_device, path);
 473         info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 474
 475         return udev_device;
 476 }
 477
 478 /**
 479  * udev_device_new_from_devnum:
 480  * @udev: udev library context
 481  * @type: char or block device
 482  * @devnum: device major/minor number
 483  *
 484  * Create new udev device, and fill in information from the sys
 485  * device and the udev database entry. The device is looked-up
 486  * by its major/minor number and type. Character and block device
 487  * numbers are not unique across the two types.
 488  *
 489  * The initial refcount is 1, and needs to be decremented to
 490  * release the resources of the udev device.
 491  *
 492  * Returns: a new udev device, or #NULL, if it does not exist
 493  **/
 494 struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
 495 {
 496         char path[UTIL_PATH_SIZE];
 497         const char *type_str;
 498
 499         if (type == 'b')
 500                 type_str = "block";
 501         else if (type == 'c')
 502                 type_str = "char";
 503         else
 504                 return NULL;
 505
 506         /* use /sys/dev/{block,char}/<maj>:<min> link */
 507         snprintf(path, sizeof(path), "%s/dev/%s/%u:%u",
 508                  udev_get_sys_path(udev), type_str, major(devnum), minor(devnum));
 509         return udev_device_new_from_syspath(udev, path);
 510 }
 511
 512 /**
 513  * udev_device_new_from_subsystem_sysname:
 514  * @udev: udev library context
 515  * @subsystem: the subsystem of the device
 516  * @sysname: the name of the device
 517  *
 518  * Create new udev device, and fill in information from the sys device
 519  * and the udev database entry. The device is looked up by the subsystem
 520  * and name string of the device, like "mem" / "zero", or "block" / "sda".
 521  *
 522  * The initial refcount is 1, and needs to be decremented to
 523  * release the resources of the udev device.
 524  *
 525  * Returns: a new udev device, or #NULL, if it does not exist
 526  **/
 527 struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 528 {
 529         char path_full[UTIL_PATH_SIZE];
 530         char *path;
 531         size_t l;
 532         struct stat statbuf;
 533
 534         path = path_full;
 535         l = util_strpcpyl(&path, sizeof(path_full), udev_get_sys_path(udev), NULL);
 536
 537         if (strcmp(subsystem, "subsystem") == 0) {
 538                 util_strscpyl(path, l, "/subsystem/", sysname, NULL);
 539                 if (stat(path_full, &statbuf) == 0)
 540                         goto found;
 541
 542                 util_strscpyl(path, l, "/bus/", sysname, NULL);
 543                 if (stat(path_full, &statbuf) == 0)
 544                         goto found;
 545
 546                 util_strscpyl(path, l, "/class/", sysname, NULL);
 547                 if (stat(path_full, &statbuf) == 0)
 548                         goto found;
 549                 goto out;
 550         }
 551
 552         if (strcmp(subsystem, "module") == 0) {
 553                 util_strscpyl(path, l, "/module/", sysname, NULL);
 554                 if (stat(path_full, &statbuf) == 0)
 555                         goto found;
 556                 goto out;
 557         }
 558
 559         if (strcmp(subsystem, "drivers") == 0) {
 560                 char subsys[UTIL_NAME_SIZE];
 561                 char *driver;
 562
 563                 util_strscpy(subsys, sizeof(subsys), sysname);
 564                 driver = strchr(subsys, ':');
 565                 if (driver != NULL) {
 566                         driver[0] = '\0';
 567                         driver = &driver[1];
 568
 569                         util_strscpyl(path, l, "/subsystem/", subsys, "/drivers/", driver, NULL);
 570                         if (stat(path_full, &statbuf) == 0)
 571                                 goto found;
 572
 573                         util_strscpyl(path, l, "/bus/", subsys, "/drivers/", driver, NULL);
 574                         if (stat(path_full, &statbuf) == 0)
 575                                 goto found;
 576                 }
 577                 goto out;
 578         }
 579
 580         util_strscpyl(path, l, "/subsystem/", subsystem, "/devices/", sysname, NULL);
 581         if (stat(path_full, &statbuf) == 0)
 582                 goto found;
 583
 584         util_strscpyl(path, l, "/bus/", subsystem, "/devices/", sysname, NULL);
 585         if (stat(path_full, &statbuf) == 0)
 586                 goto found;
 587
 588         util_strscpyl(path, l, "/class/", subsystem, "/", sysname, NULL);
 589         if (stat(path_full, &statbuf) == 0)
 590                 goto found;
 591 out:
 592         return NULL;
 593 found:
 594         return udev_device_new_from_syspath(udev, path_full);
 595 }
 596
 597 /**
 598  * udev_device_new_from_environment
 599  * @udev: udev library context
 600  *
 601  * Create new udev device, and fill in information from the
 602  * current process environment. This only works reliable if
 603  * the process is called from a udev rule. It is usually used
 604  * for tools executed from IMPORT= rules.
 605  *
 606  * The initial refcount is 1, and needs to be decremented to
 607  * release the resources of the udev device.
 608  *
 609  * Returns: a new udev device, or #NULL, if it does not exist
 610  **/
 611 struct udev_device *udev_device_new_from_environment(struct udev *udev)
 612 {
 613         int i;
 614         struct udev_device *udev_device;
 615
 616         udev_device = udev_device_new(udev);
 617         if (udev_device == NULL)
 618                 return NULL;
 619         udev_device_set_info_loaded(udev_device);
 620
 621         for (i = 0; environ[i] != NULL; i++)
 622                 udev_device_add_property_from_string_parse(udev_device, environ[i]);
 623
 624         if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
 625                 info(udev, "missing values, invalid device\n");
 626                 udev_device_unref(udev_device);
 627                 udev_device = NULL;
 628         }
 629
 630         return udev_device;
 631 }
 632
 633 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
 634 {
 635         struct udev_device *udev_device_parent = NULL;
 636         char path[UTIL_PATH_SIZE];
 637         const char *subdir;
 638
 639         util_strscpy(path, sizeof(path), udev_device->syspath);
 640         subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
 641         for (;;) {
 642                 char *pos;
 643
 644                 pos = strrchr(subdir, '/');
 645                 if (pos == NULL || pos < &subdir[2])
 646                         break;
 647                 pos[0] = '\0';
 648                 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
 649                 if (udev_device_parent != NULL)
 650                         return udev_device_parent;
 651         }
 652         return NULL;
 653 }
 654
 655 /**
 656  * udev_device_get_parent:
 657  * @udev_device: the device to start searching from
 658  *
 659  * Find the next parent device, and fill in information from the sys
 660  * device and the udev database entry.
 661  *
 662  * The returned the device is not referenced. It is attached to the
 663  * child device, and will be cleaned up when the child device
 664  * is cleaned up.
 665  *
 666  * It is not necessarily just the upper level directory, empty or not
 667  * recognized sys directories are ignored.
 668  *
 669  * It can be called as many times as needed, without caring about
 670  * references.
 671  *
 672  * Returns: a new udev device, or #NULL, if it no parent exist.
 673  **/
 674 struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 675 {
 676         if (udev_device == NULL)
 677                 return NULL;
 678         if (!udev_device->parent_set) {
 679                 udev_device->parent_set = true;
 680                 udev_device->parent_device = device_new_from_parent(udev_device);
 681         }
 682         if (udev_device->parent_device != NULL)
 683                 dbg(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
 684         return udev_device->parent_device;
 685 }
 686
 687 /**
 688  * udev_device_get_parent_with_subsystem_devtype:
 689  * @udev_device: udev device to start searching from
 690  * @subsystem: the subsystem of the device
 691  * @devtype: the type (DEVTYPE) of the device
 692  *
 693  * Find the next parent device, with a matching subsystem and devtype
 694  * value, and fill in information from the sys device and the udev
 695  * database entry.
 696  *
 697  * If devtype is #NULL, only subsystem is checked, and any devtype will
 698  * match.
 699  *
 700  * The returned the device is not referenced. It is attached to the
 701  * child device, and will be cleaned up when the child device
 702  * is cleaned up.
 703  *
 704  * It can be called as many times as needed, without caring about
 705  * references.
 706  *
 707  * Returns: a new udev device, or #NULL if no matching parent exists.
 708  **/
 709 struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
 710 {
 711         struct udev_device *parent;
 712
 713         if (subsystem == NULL)
 714                 return NULL;
 715
 716         parent = udev_device_get_parent(udev_device);
 717         while (parent != NULL) {
 718                 const char *parent_subsystem;
 719                 const char *parent_devtype;
 720
 721                 parent_subsystem = udev_device_get_subsystem(parent);
 722                 if (parent_subsystem != NULL && strcmp(parent_subsystem, subsystem) == 0) {
 723                         if (devtype == NULL)
 724                                 break;
 725                         parent_devtype = udev_device_get_devtype(parent);
 726                         if (parent_devtype != NULL && strcmp(parent_devtype, devtype) == 0)
 727                                 break;
 728                 }
 729                 parent = udev_device_get_parent(parent);
 730         }
 731         return parent;
 732 }
 733
 734 /**
 735  * udev_device_get_udev:
 736  * @udev_device: udev device
 737  *
 738  * Retrieve the udev library context the device was created with.
 739  *
 740  * Returns: the udev library context
 741  **/
 742 struct udev *udev_device_get_udev(struct udev_device *udev_device)
 743 {
 744         if (udev_device == NULL)
 745                 return NULL;
 746         return udev_device->udev;
 747 }
 748
 749 /**
 750  * udev_device_ref:
 751  * @udev_device: udev device
 752  *
 753  * Take a reference of a udev device.
 754  *
 755  * Returns: the passed udev device
 756  **/
 757 struct udev_device *udev_device_ref(struct udev_device *udev_device)
 758 {
 759         if (udev_device == NULL)
 760                 return NULL;
 761         udev_device->refcount++;
 762         return udev_device;
 763 }
 764
 765 /**
 766  * udev_device_unref:
 767  * @udev_device: udev device
 768  *
 769  * Drop a reference of a udev device. If the refcount reaches zero,
 770  * the resources of the device will be released.
 771  *
 772  **/
 773 void udev_device_unref(struct udev_device *udev_device)
 774 {
 775         if (udev_device == NULL)
 776                 return;
 777         udev_device->refcount--;
 778         if (udev_device->refcount > 0)
 779                 return;
 780         if (udev_device->parent_device != NULL)
 781                 udev_device_unref(udev_device->parent_device);
 782         free(udev_device->syspath);
 783         free(udev_device->sysname);
 784         free(udev_device->devnode);
 785         free(udev_device->subsystem);
 786         free(udev_device->devtype);
 787         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 788         udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
 789         udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
 790         udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
 791         free(udev_device->action);
 792         free(udev_device->driver);
 793         free(udev_device->devpath_old);
 794         free(udev_device->sysname_old);
 795         free(udev_device->knodename);
 796         free(udev_device->envp);
 797         free(udev_device->monitor_buf);
 798         dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
 799         free(udev_device);
 800 }
 801
 802 /**
 803  * udev_device_get_devpath:
 804  * @udev_device: udev device
 805  *
 806  * Retrieve the kernel devpath value of the udev device. The path
 807  * does not contain the sys mount point, and starts with a '/'.
 808  *
 809  * Returns: the devpath of the udev device
 810  **/
 811 const char *udev_device_get_devpath(struct udev_device *udev_device)
 812 {
 813         if (udev_device == NULL)
 814                 return NULL;
 815         return udev_device->devpath;
 816 }
 817
 818 /**
 819  * udev_device_get_syspath:
 820  * @udev_device: udev device
 821  *
 822  * Retrieve the sys path of the udev device. The path is an
 823  * absolute path and starts with the sys mount point.
 824  *
 825  * Returns: the sys path of the udev device
 826  **/
 827 const char *udev_device_get_syspath(struct udev_device *udev_device)
 828 {
 829         if (udev_device == NULL)
 830                 return NULL;
 831         return udev_device->syspath;
 832 }
 833
 834 /**
 835  * udev_device_get_sysname:
 836  * @udev_device: udev device
 837  *
 838  * Returns: the sys name of the device device
 839  **/
 840 const char *udev_device_get_sysname(struct udev_device *udev_device)
 841 {
 842         if (udev_device == NULL)
 843                 return NULL;
 844         return udev_device->sysname;
 845 }
 846
 847 /**
 848  * udev_device_get_sysnum:
 849  * @udev_device: udev device
 850  *
 851  * Returns: the trailing number of of the device name
 852  **/
 853 const char *udev_device_get_sysnum(struct udev_device *udev_device)
 854 {
 855         if (udev_device == NULL)
 856                 return NULL;
 857         return udev_device->sysnum;
 858 }
 859
 860 /**
 861  * udev_device_get_devnode:
 862  * @udev_device: udev device
 863  *
 864  * Retrieve the device node file name belonging to the udev device.
 865  * The path is an absolute path, and starts with the device directory.
 866  *
 867  * Returns: the device node file name of the udev device, or #NULL if no device node exists
 868  **/
 869 const char *udev_device_get_devnode(struct udev_device *udev_device)
 870 {
 871         if (udev_device == NULL)
 872                 return NULL;
 873         if (!udev_device->info_loaded)
 874                 udev_device_read_db(udev_device);
 875         return udev_device->devnode;
 876 }
 877
 878 /**
 879  * udev_device_get_subsystem:
 880  * @udev_device: udev device
 881  *
 882  * Retrieve the subsystem string of the udev device. The string does not
 883  * contain any "/".
 884  *
 885  * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
 886  **/
 887 const char *udev_device_get_subsystem(struct udev_device *udev_device)
 888 {
 889         char subsystem[UTIL_NAME_SIZE];
 890
 891         if (udev_device == NULL)
 892                 return NULL;
 893         if (!udev_device->subsystem_set) {
 894                 udev_device->subsystem_set = true;
 895                 /* read "subsystem" link */
 896                 if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
 897                         udev_device_set_subsystem(udev_device, subsystem);
 898                         return udev_device->subsystem;
 899                 }
 900                 /* implicit names */
 901                 if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
 902                         udev_device_set_subsystem(udev_device, "module");
 903                         return udev_device->subsystem;
 904                 }
 905                 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
 906                         udev_device_set_subsystem(udev_device, "drivers");
 907                         return udev_device->subsystem;
 908                 }
 909                 if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
 910                     strncmp(udev_device->devpath, "/class/", 7) == 0 ||
 911                     strncmp(udev_device->devpath, "/bus/", 5) == 0) {
 912                         udev_device_set_subsystem(udev_device, "subsystem");
 913                         return udev_device->subsystem;
 914                 }
 915         }
 916         return udev_device->subsystem;
 917 }
 918
 919 /**
 920  * udev_device_get_devtype:
 921  * @udev_device: udev device
 922  *
 923  * Retrieve the devtype string of the udev device.
 924  *
 925  * Returns: the devtype name of the udev device, or #NULL if it can not be determined
 926  **/
 927 const char *udev_device_get_devtype(struct udev_device *udev_device)
 928 {
 929         if (udev_device == NULL)
 930                 return NULL;
 931         if (!udev_device->devtype_set) {
 932                 udev_device->devtype_set = true;
 933                 udev_device_read_uevent_file(udev_device);
 934         }
 935         return udev_device->devtype;
 936 }
 937
 938 /**
 939  * udev_device_get_devlinks_list_entry:
 940  * @udev_device: udev device
 941  *
 942  * Retrieve the list of device links pointing to the device file of
 943  * the udev device. The next list entry can be retrieved with
 944  * udev_list_entry_next(), which returns #NULL if no more entries exist.
 945  * The devlink path can be retrieved from the list entry by
 946  * udev_list_entry_get_name(). The path is an absolute path, and starts with
 947  * the device directory.
 948  *
 949  * Returns: the first entry of the device node link list
 950  **/
 951 struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
 952 {
 953         if (udev_device == NULL)
 954                 return NULL;
 955         if (!udev_device->info_loaded)
 956                 udev_device_read_db(udev_device);
 957         return udev_list_get_entry(&udev_device->devlinks_list);
 958 }
 959
 960 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
 961 {
 962         udev_device->devlinks_uptodate = false;
 963         udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 964 }
 965
 966 /**
 967  * udev_device_get_properties_list_entry:
 968  * @udev_device: udev device
 969  *
 970  * Retrieve the list of key/value device properties of the udev
 971  * device. The next list entry can be retrieved with udev_list_entry_next(),
 972  * which returns #NULL if no more entries exist. The property name
 973  * can be retrieved from the list entry by udev_list_get_name(),
 974  * the property value by udev_list_get_value().
 975  *
 976  * Returns: the first entry of the property list
 977  **/
 978 struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
 979 {
 980         if (udev_device == NULL)
 981                 return NULL;
 982         if (!udev_device->info_loaded) {
 983                 udev_device_read_uevent_file(udev_device);
 984                 udev_device_read_db(udev_device);
 985         }
 986         if (!udev_device->devlinks_uptodate) {
 987                 char symlinks[UTIL_PATH_SIZE];
 988                 struct udev_list_entry *list_entry;
 989
 990                 udev_device->devlinks_uptodate = true;
 991                 list_entry = udev_device_get_devlinks_list_entry(udev_device);
 992                 if (list_entry != NULL) {
 993                         char *s;
 994                         size_t l;
 995
 996                         s = symlinks;
 997                         l = util_strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
 998                         udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
 999                                 l = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1000                         udev_device_add_property(udev_device, "DEVLINKS", symlinks);
1001                 }
1002         }
1003         if (!udev_device->tags_uptodate) {
1004                 udev_device->tags_uptodate = true;
1005                 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1006                         char tags[UTIL_PATH_SIZE];
1007                         struct udev_list_entry *list_entry;
1008                         char *s;
1009                         size_t l;
1010
1011                         s = tags;
1012                         l = util_strpcpyl(&s, sizeof(tags), ":", NULL);
1013                         udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1014                                 l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1015                         udev_device_add_property(udev_device, "TAGS", tags);
1016                 }
1017         }
1018         return udev_list_get_entry(&udev_device->properties_list);
1019 }
1020
1021 /**
1022  * udev_device_get_driver:
1023  * @udev_device: udev device
1024  *
1025  * Returns: the driver string, or #NULL if there is no driver attached.
1026  **/
1027 const char *udev_device_get_driver(struct udev_device *udev_device)
1028 {
1029         char driver[UTIL_NAME_SIZE];
1030
1031         if (udev_device == NULL)
1032                 return NULL;
1033         if (!udev_device->driver_set) {
1034                 udev_device->driver_set = true;
1035                 if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
1036                         udev_device->driver = strdup(driver);
1037         }
1038         return udev_device->driver;
1039 }
1040
1041 /**
1042  * udev_device_get_devnum:
1043  * @udev_device: udev device
1044  *
1045  * Returns: the device major/minor number.
1046  **/
1047 dev_t udev_device_get_devnum(struct udev_device *udev_device)
1048 {
1049         if (udev_device == NULL)
1050                 return makedev(0, 0);
1051         if (!udev_device->info_loaded)
1052                 udev_device_read_uevent_file(udev_device);
1053         return udev_device->devnum;
1054 }
1055
1056 /**
1057  * udev_device_get_action:
1058  * @udev_device: udev device
1059  *
1060  * This is only valid if the device was received through a monitor. Devices read from
1061  * sys do not have an action string. Usual actions are: add, remove, change, online,
1062  * offline.
1063  *
1064  * Returns: the kernel action value, or #NULL if there is no action value available.
1065  **/
1066 const char *udev_device_get_action(struct udev_device *udev_device)
1067 {
1068         if (udev_device == NULL)
1069                 return NULL;
1070         return udev_device->action;
1071 }
1072
1073 /**
1074  * udev_device_get_devnum:
1075  * @udev_device: udev device
1076  *
1077  * This is only valid if the device was received through a monitor. Devices read from
1078  * sys do not have a sequence number.
1079  *
1080  * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
1081  **/
1082 unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
1083 {
1084         if (udev_device == NULL)
1085                 return 0;
1086         return udev_device->seqnum;
1087 }
1088
1089 /**
1090  * udev_device_get_sysattr_value:
1091  * @udev_device: udev device
1092  * @sysattr: attribute name
1093  *
1094  * The retrieved value is cached in the device. Repeated calls will return the same
1095  * value and not open the attribute again.
1096  *
1097  * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1098  **/
1099 const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1100 {
1101         struct udev_list_entry *list_entry;
1102         char path[UTIL_PATH_SIZE];
1103         char value[4096];
1104         struct stat statbuf;
1105         int fd;
1106         ssize_t size;
1107         const char *val = NULL;
1108
1109         if (udev_device == NULL)
1110                 return NULL;
1111         if (sysattr == NULL)
1112                 return NULL;
1113
1114         /* look for possibly already cached result */
1115         udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
1116                 if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
1117                         dbg(udev_device->udev, "got '%s' (%s) from cache\n",
1118                             sysattr, udev_list_entry_get_value(list_entry));
1119                         return udev_list_entry_get_value(list_entry);
1120                 }
1121         }
1122
1123         util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1124         if (lstat(path, &statbuf) != 0) {
1125                 dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
1126                 udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
1127                 goto out;
1128         }
1129
1130         if (S_ISLNK(statbuf.st_mode)) {
1131                 char target[UTIL_NAME_SIZE];
1132                 int len;
1133                 char *pos;
1134
1135                 /* some core links return the last element of the target path */
1136                 if (strcmp(sysattr, "driver") != 0 &&
1137                     strcmp(sysattr, "subsystem") != 0 &&
1138                     strcmp(sysattr, "module") != 0)
1139                         goto out;
1140
1141                 len = readlink(path, target, sizeof(target));
1142                 if (len <= 0 || len == sizeof(target))
1143                         goto out;
1144                 target[len] = '\0';
1145
1146                 pos = strrchr(target, '/');
1147                 if (pos != NULL) {
1148                         pos = &pos[1];
1149                         dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
1150                         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
1151                         val = udev_list_entry_get_value(list_entry);
1152                 }
1153
1154                 goto out;
1155         }
1156
1157         /* skip directories */
1158         if (S_ISDIR(statbuf.st_mode))
1159                 goto out;
1160
1161         /* skip non-readable files */
1162         if ((statbuf.st_mode & S_IRUSR) == 0)
1163                 goto out;
1164
1165         /* read attribute value */
1166         fd = open(path, O_RDONLY);
1167         if (fd < 0) {
1168                 dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
1169                 goto out;
1170         }
1171         size = read(fd, value, sizeof(value));
1172         close(fd);
1173         if (size < 0)
1174                 goto out;
1175         if (size == sizeof(value))
1176                 goto out;
1177
1178         /* got a valid value, store it in cache and return it */
1179         value[size] = '\0';
1180         util_remove_trailing_chars(value, '\n');
1181         dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
1182         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
1183         val = udev_list_entry_get_value(list_entry);
1184 out:
1185         return val;
1186 }
1187
1188 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
1189 {
1190         const char *pos;
1191         size_t len;
1192
1193         free(udev_device->syspath);
1194         udev_device->syspath = strdup(syspath);
1195         if (udev_device->syspath ==  NULL)
1196                 return -ENOMEM;
1197         udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
1198         udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
1199
1200         pos = strrchr(udev_device->syspath, '/');
1201         if (pos == NULL)
1202                 return -EINVAL;
1203         udev_device->sysname = strdup(&pos[1]);
1204         if (udev_device->sysname == NULL)
1205                 return -ENOMEM;
1206
1207         /* some devices have '!' in their name, change that to '/' */
1208         len = 0;
1209         while (udev_device->sysname[len] != '\0') {
1210                 if (udev_device->sysname[len] == '!')
1211                         udev_device->sysname[len] = '/';
1212                 len++;
1213         }
1214
1215         /* trailing number */
1216         while (len > 0 && isdigit(udev_device->sysname[--len]))
1217                 udev_device->sysnum = &udev_device->sysname[len];
1218
1219         /* sysname is completely numeric */
1220         if (len == 0)
1221                 udev_device->sysnum = NULL;
1222
1223         return 0;
1224 }
1225
1226 int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
1227 {
1228         free(udev_device->subsystem);
1229         udev_device->subsystem = strdup(subsystem);
1230         if (udev_device->subsystem == NULL)
1231                 return -ENOMEM;
1232         udev_device->subsystem_set = true;
1233         udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
1234         return 0;
1235 }
1236
1237 int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
1238 {
1239         free(udev_device->devtype);
1240         udev_device->devtype = strdup(devtype);
1241         if (udev_device->devtype == NULL)
1242                 return -ENOMEM;
1243         udev_device->devtype_set = true;
1244         udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
1245         return 0;
1246 }
1247
1248 int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1249 {
1250         free(udev_device->devnode);
1251         udev_device->devnode = strdup(devnode);
1252         if (devnode == NULL)
1253                 return 0;
1254         if (udev_device->devnode == NULL)
1255                 return -ENOMEM;
1256         udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1257         return 0;
1258 }
1259
1260 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink, int unique)
1261 {
1262         struct udev_list_entry *list_entry;
1263
1264         udev_device->devlinks_uptodate = false;
1265         list_entry = udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0);
1266         if (list_entry == NULL)
1267                 return -ENOMEM;
1268         if (unique)
1269                 udev_list_entry_set_flags(list_entry, 1);
1270         return 0;
1271 }
1272
1273 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1274 {
1275         if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL)
1276                 return -EINVAL;
1277         udev_device->tags_uptodate = false;
1278         if (udev_list_entry_add(udev_device->udev, &udev_device->tags_list, tag, NULL, 1, 0) != NULL)
1279                 return 0;
1280         return -ENOMEM;
1281 }
1282
1283 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1284 {
1285         udev_device->tags_uptodate = false;
1286         udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
1287 }
1288
1289 struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1290 {
1291         return udev_list_get_entry(&udev_device->tags_list);
1292 }
1293
1294 int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1295 {
1296         struct udev_list_entry *list_entry;
1297
1298         if (!udev_device->info_loaded)
1299                 udev_device_read_db(udev_device);
1300         list_entry = udev_device_get_tags_list_entry(udev_device);
1301         list_entry =  udev_list_entry_get_by_name(list_entry, tag);
1302         if (list_entry != NULL)
1303                 return 1;
1304         return 0;
1305 }
1306
1307 #define ENVP_SIZE                       128
1308 #define MONITOR_BUF_SIZE                4096
1309 static int update_envp_monitor_buf(struct udev_device *udev_device)
1310 {
1311         struct udev_list_entry *list_entry;
1312         char *s;
1313         size_t l;
1314         unsigned int i;
1315
1316         /* monitor buffer of property strings */
1317         free(udev_device->monitor_buf);
1318         udev_device->monitor_buf_len = 0;
1319         udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1320         if (udev_device->monitor_buf == NULL)
1321                 return -ENOMEM;
1322
1323         /* envp array, strings will point into monitor buffer */
1324         if (udev_device->envp == NULL)
1325                 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1326         if (udev_device->envp == NULL)
1327                 return -ENOMEM;
1328
1329         i = 0;
1330         s = udev_device->monitor_buf;
1331         l = MONITOR_BUF_SIZE;
1332         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1333                 const char *key;
1334
1335                 key = udev_list_entry_get_name(list_entry);
1336                 /* skip private variables */
1337                 if (key[0] == '.')
1338                         continue;
1339
1340                 /* add string to envp array */
1341                 udev_device->envp[i++] = s;
1342                 if (i+1 >= ENVP_SIZE)
1343                         return -EINVAL;
1344
1345                 /* add property string to monitor buffer */
1346                 l = util_strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1347                 if (l == 0)
1348                         return -EINVAL;
1349                 /* advance past the trailing '\0' that util_strpcpyl() guarantees */
1350                 s++;
1351                 l--;
1352         }
1353         udev_device->envp[i] = NULL;
1354         udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1355         udev_device->envp_uptodate = true;
1356         dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n",
1357             i, udev_device->monitor_buf_len);
1358         return 0;
1359 }
1360
1361 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1362 {
1363         if (!udev_device->envp_uptodate)
1364                 if (update_envp_monitor_buf(udev_device) != 0)
1365                         return NULL;
1366         return udev_device->envp;
1367 }
1368
1369 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1370 {
1371         if (!udev_device->envp_uptodate)
1372                 if (update_envp_monitor_buf(udev_device) != 0)
1373                         return -EINVAL;
1374         *buf = udev_device->monitor_buf;
1375         return udev_device->monitor_buf_len;
1376 }
1377
1378 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1379 {
1380         free(udev_device->action);
1381         udev_device->action = strdup(action);
1382         if (udev_device->action == NULL)
1383                 return -ENOMEM;
1384         udev_device_add_property(udev_device, "ACTION", udev_device->action);
1385         return 0;
1386 }
1387
1388 int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
1389 {
1390         free(udev_device->driver);
1391         udev_device->driver = strdup(driver);
1392         if (udev_device->driver == NULL)
1393                 return -ENOMEM;
1394         udev_device->driver_set = true;
1395         udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
1396         return 0;
1397 }
1398
1399 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
1400 {
1401         return udev_device->devpath_old;
1402 }
1403
1404 int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
1405 {
1406         const char *pos;
1407         size_t len;
1408
1409         free(udev_device->devpath_old);
1410         udev_device->devpath_old = strdup(devpath_old);
1411         if (udev_device->devpath_old == NULL)
1412                 return -ENOMEM;
1413         udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
1414
1415         pos = strrchr(udev_device->devpath_old, '/');
1416         if (pos == NULL)
1417                 return -EINVAL;
1418         udev_device->sysname_old = strdup(&pos[1]);
1419         if (udev_device->sysname_old == NULL)
1420                 return -ENOMEM;
1421
1422         /* some devices have '!' in their name, change that to '/' */
1423         len = 0;
1424         while (udev_device->sysname_old[len] != '\0') {
1425                 if (udev_device->sysname_old[len] == '!')
1426                         udev_device->sysname_old[len] = '/';
1427                 len++;
1428         }
1429         return 0;
1430 }
1431
1432 const char *udev_device_get_sysname_old(struct udev_device *udev_device)
1433 {
1434         if (udev_device == NULL)
1435                 return NULL;
1436         return udev_device->sysname_old;
1437 }
1438
1439 const char *udev_device_get_knodename(struct udev_device *udev_device)
1440 {
1441         return udev_device->knodename;
1442 }
1443
1444 int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
1445 {
1446         free(udev_device->knodename);
1447         udev_device->knodename = strdup(knodename);
1448         if (udev_device->knodename == NULL)
1449                 return -ENOMEM;
1450         udev_device_add_property(udev_device, "DEVNAME", udev_device->knodename);
1451         return 0;
1452 }
1453
1454 int udev_device_get_timeout(struct udev_device *udev_device)
1455 {
1456         return udev_device->timeout;
1457 }
1458
1459 int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
1460 {
1461         udev_device->timeout = timeout;
1462         return 0;
1463 }
1464 int udev_device_get_event_timeout(struct udev_device *udev_device)
1465 {
1466         if (!udev_device->info_loaded)
1467                 udev_device_read_db(udev_device);
1468         return udev_device->event_timeout;
1469 }
1470
1471 int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
1472 {
1473         udev_device->event_timeout = event_timeout;
1474         return 0;
1475 }
1476
1477 int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
1478 {
1479         char num[32];
1480
1481         udev_device->seqnum = seqnum;
1482         snprintf(num, sizeof(num), "%llu", seqnum);
1483         udev_device_add_property(udev_device, "SEQNUM", num);
1484         return 0;
1485 }
1486
1487 int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
1488 {
1489         char num[32];
1490
1491         udev_device->devnum = devnum;
1492
1493         snprintf(num, sizeof(num), "%u", major(devnum));
1494         udev_device_add_property(udev_device, "MAJOR", num);
1495         snprintf(num, sizeof(num), "%u", minor(devnum));
1496         udev_device_add_property(udev_device, "MINOR", num);
1497         return 0;
1498 }
1499
1500 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1501 {
1502         if (!udev_device->info_loaded)
1503                 udev_device_read_db(udev_device);
1504         return udev_device->devlink_priority;
1505 }
1506
1507 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1508 {
1509          udev_device->devlink_priority = prio;
1510         return 0;
1511 }
1512
1513 int udev_device_get_watch_handle(struct udev_device *udev_device)
1514 {
1515         if (!udev_device->info_loaded)
1516                 udev_device_read_db(udev_device);
1517         return udev_device->watch_handle;
1518 }
1519
1520 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1521 {
1522         udev_device->watch_handle = handle;
1523         return 0;
1524 }