unit.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30
  31 #include "set.h"
  32 #include "unit.h"
  33 #include "macro.h"
  34 #include "strv.h"
  35 #include "load-fragment.h"
  36 #include "load-dropin.h"
  37 #include "log.h"
  38
  39 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  40         [UNIT_SERVICE] = &service_vtable,
  41         [UNIT_TIMER] = &timer_vtable,
  42         [UNIT_SOCKET] = &socket_vtable,
  43         [UNIT_TARGET] = &target_vtable,
  44         [UNIT_DEVICE] = &device_vtable,
  45         [UNIT_MOUNT] = &mount_vtable,
  46         [UNIT_AUTOMOUNT] = &automount_vtable,
  47         [UNIT_SNAPSHOT] = &snapshot_vtable
  48 };
  49
  50 UnitType unit_name_to_type(const char *n) {
  51         UnitType t;
  52
  53         assert(n);
  54
  55         for (t = 0; t < _UNIT_TYPE_MAX; t++)
  56                 if (endswith(n, unit_vtable[t]->suffix))
  57                         return t;
  58
  59         return _UNIT_TYPE_INVALID;
  60 }
  61
  62 #define VALID_CHARS                             \
  63         "0123456789"                            \
  64         "abcdefghijklmnopqrstuvwxyz"            \
  65         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
  66         "-_.\\"
  67
  68 bool unit_name_is_valid(const char *n) {
  69         UnitType t;
  70         const char *e, *i;
  71
  72         assert(n);
  73
  74         if (strlen(n) >= UNIT_NAME_MAX)
  75                 return false;
  76
  77         t = unit_name_to_type(n);
  78         if (t < 0 || t >= _UNIT_TYPE_MAX)
  79                 return false;
  80
  81         if (!(e = strrchr(n, '.')))
  82                 return false;
  83
  84         if (e == n)
  85                 return false;
  86
  87         for (i = n; i < e; i++)
  88                 if (!strchr(VALID_CHARS, *i))
  89                         return false;
  90
  91         return true;
  92 }
  93
  94 char *unit_name_change_suffix(const char *n, const char *suffix) {
  95         char *e, *r;
  96         size_t a, b;
  97
  98         assert(n);
  99         assert(unit_name_is_valid(n));
 100         assert(suffix);
 101
 102         assert_se(e = strrchr(n, '.'));
 103         a = e - n;
 104         b = strlen(suffix);
 105
 106         if (!(r = new(char, a + b + 1)))
 107                 return NULL;
 108
 109         memcpy(r, n, a);
 110         memcpy(r+a, suffix, b+1);
 111
 112         return r;
 113 }
 114
 115 Unit *unit_new(Manager *m) {
 116         Unit *u;
 117
 118         assert(m);
 119
 120         if (!(u = new0(Unit, 1)))
 121                 return NULL;
 122
 123         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
 124                 free(u);
 125                 return NULL;
 126         }
 127
 128         u->meta.manager = m;
 129         u->meta.type = _UNIT_TYPE_INVALID;
 130
 131         return u;
 132 }
 133
 134 bool unit_has_name(Unit *u, const char *name) {
 135         assert(u);
 136         assert(name);
 137
 138         return !!set_get(u->meta.names, (char*) name);
 139 }
 140
 141 int unit_add_name(Unit *u, const char *text) {
 142         UnitType t;
 143         char *s;
 144         int r;
 145
 146         assert(u);
 147         assert(text);
 148
 149         if (!unit_name_is_valid(text))
 150                 return -EINVAL;
 151
 152         if ((t = unit_name_to_type(text)) == _UNIT_TYPE_INVALID)
 153                 return -EINVAL;
 154
 155         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type)
 156                 return -EINVAL;
 157
 158         if (!(s = strdup(text)))
 159                 return -ENOMEM;
 160
 161         if ((r = set_put(u->meta.names, s)) < 0) {
 162                 free(s);
 163
 164                 if (r == -EEXIST)
 165                         return 0;
 166
 167                 return r;
 168         }
 169
 170         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 171                 set_remove(u->meta.names, s);
 172                 free(s);
 173                 return r;
 174         }
 175
 176         if (u->meta.type == _UNIT_TYPE_INVALID)
 177                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 178
 179         u->meta.type = t;
 180
 181         if (!u->meta.id)
 182                 u->meta.id = s;
 183
 184         unit_add_to_dbus_queue(u);
 185         return 0;
 186 }
 187
 188 int unit_choose_id(Unit *u, const char *name) {
 189         char *s;
 190
 191         assert(u);
 192         assert(name);
 193
 194         /* Selects one of the names of this unit as the id */
 195
 196         if (!(s = set_get(u->meta.names, (char*) name)))
 197                 return -ENOENT;
 198
 199         u->meta.id = s;
 200
 201         unit_add_to_dbus_queue(u);
 202         return 0;
 203 }
 204
 205 int unit_set_description(Unit *u, const char *description) {
 206         char *s;
 207
 208         assert(u);
 209
 210         if (!(s = strdup(description)))
 211                 return -ENOMEM;
 212
 213         free(u->meta.description);
 214         u->meta.description = s;
 215
 216         unit_add_to_dbus_queue(u);
 217         return 0;
 218 }
 219
 220 void unit_add_to_load_queue(Unit *u) {
 221         assert(u);
 222         assert(u->meta.type != _UNIT_TYPE_INVALID);
 223
 224         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 225                 return;
 226
 227         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 228         u->meta.in_load_queue = true;
 229 }
 230
 231 void unit_add_to_cleanup_queue(Unit *u) {
 232         assert(u);
 233
 234         if (u->meta.in_cleanup_queue)
 235                 return;
 236
 237         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 238         u->meta.in_cleanup_queue = true;
 239 }
 240
 241 void unit_add_to_dbus_queue(Unit *u) {
 242         assert(u);
 243         assert(u->meta.type != _UNIT_TYPE_INVALID);
 244
 245         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
 246                 return;
 247
 248         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 249         u->meta.in_dbus_queue = true;
 250 }
 251
 252 static void bidi_set_free(Unit *u, Set *s) {
 253         Iterator i;
 254         Unit *other;
 255
 256         assert(u);
 257
 258         /* Frees the set and makes sure we are dropped from the
 259          * inverse pointers */
 260
 261         SET_FOREACH(other, s, i) {
 262                 UnitDependency d;
 263
 264                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 265                         set_remove(other->meta.dependencies[d], u);
 266         }
 267
 268         set_free(s);
 269 }
 270
 271 void unit_free(Unit *u) {
 272         UnitDependency d;
 273         Iterator i;
 274         char *t;
 275
 276         assert(u);
 277
 278         bus_unit_send_removed_signal(u);
 279
 280         /* Detach from next 'bigger' objects */
 281
 282         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 283
 284         SET_FOREACH(t, u->meta.names, i)
 285                 hashmap_remove_value(u->meta.manager->units, t, u);
 286
 287         if (u->meta.type != _UNIT_TYPE_INVALID)
 288                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 289
 290         if (u->meta.in_load_queue)
 291                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 292
 293         if (u->meta.in_dbus_queue)
 294                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 295
 296         if (u->meta.in_cleanup_queue)
 297                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 298
 299         if (u->meta.load_state != UNIT_STUB)
 300                 if (UNIT_VTABLE(u)->done)
 301                         UNIT_VTABLE(u)->done(u);
 302
 303         /* Free data and next 'smaller' objects */
 304         if (u->meta.job)
 305                 job_free(u->meta.job);
 306
 307         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 308                 bidi_set_free(u, u->meta.dependencies[d]);
 309
 310         free(u->meta.description);
 311         free(u->meta.fragment_path);
 312
 313         while ((t = set_steal_first(u->meta.names)))
 314                 free(t);
 315         set_free(u->meta.names);
 316
 317         free(u);
 318 }
 319
 320 UnitActiveState unit_active_state(Unit *u) {
 321         assert(u);
 322
 323         if (u->meta.load_state != UNIT_LOADED)
 324                 return UNIT_INACTIVE;
 325
 326         return UNIT_VTABLE(u)->active_state(u);
 327 }
 328
 329 static void complete_move(Set **s, Set **other) {
 330         assert(s);
 331         assert(other);
 332
 333         if (!*other)
 334                 return;
 335
 336         if (*s)
 337                 set_move(*s, *other);
 338         else {
 339                 *s = *other;
 340                 *other = NULL;
 341         }
 342 }
 343
 344 static void merge_names(Unit *u, Unit *other) {
 345         char *t;
 346         Iterator i;
 347
 348         assert(u);
 349         assert(other);
 350
 351         complete_move(&u->meta.names, &other->meta.names);
 352
 353         while ((t = set_steal_first(other->meta.names)))
 354                 free(t);
 355
 356         set_free(other->meta.names);
 357         other->meta.names = NULL;
 358         other->meta.id = NULL;
 359
 360         SET_FOREACH(t, u->meta.names, i)
 361                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 362 }
 363
 364 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 365         Iterator i;
 366         Unit *back;
 367         int r;
 368
 369         assert(u);
 370         assert(other);
 371         assert(d < _UNIT_DEPENDENCY_MAX);
 372
 373         SET_FOREACH(back, other->meta.dependencies[d], i) {
 374                 UnitDependency k;
 375
 376                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 377                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 378
 379                                 if (r == -EEXIST)
 380                                         set_remove(back->meta.dependencies[k], other);
 381                                 else
 382                                         assert(r == -ENOENT);
 383                         }
 384         }
 385
 386         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 387
 388         set_free(other->meta.dependencies[d]);
 389         other->meta.dependencies[d] = NULL;
 390 }
 391
 392 int unit_merge(Unit *u, Unit *other) {
 393         UnitDependency d;
 394
 395         assert(u);
 396         assert(other);
 397         assert(u->meta.manager == other->meta.manager);
 398
 399         other = unit_follow_merge(other);
 400
 401         if (other == u)
 402                 return 0;
 403
 404         /* This merges 'other' into 'unit'. FIXME: This does not
 405          * rollback on failure. */
 406
 407         if (u->meta.type != u->meta.type)
 408                 return -EINVAL;
 409
 410         if (other->meta.load_state != UNIT_STUB &&
 411             other->meta.load_state != UNIT_FAILED)
 412                 return -EEXIST;
 413
 414         if (other->meta.job)
 415                 return -EEXIST;
 416
 417         if (unit_active_state(other) != UNIT_INACTIVE)
 418                 return -EEXIST;
 419
 420         /* Merge names */
 421         merge_names(u, other);
 422
 423         /* Merge dependencies */
 424         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 425                 merge_dependencies(u, other, d);
 426
 427         unit_add_to_dbus_queue(u);
 428
 429         other->meta.load_state = UNIT_MERGED;
 430         other->meta.merged_into = u;
 431
 432         unit_add_to_cleanup_queue(other);
 433
 434         return 0;
 435 }
 436
 437 int unit_merge_by_name(Unit *u, const char *name) {
 438         Unit *other;
 439
 440         assert(u);
 441         assert(name);
 442
 443         if (!(other = manager_get_unit(u->meta.manager, name)))
 444                 return unit_add_name(u, name);
 445
 446         return unit_merge(u, other);
 447 }
 448
 449 Unit* unit_follow_merge(Unit *u) {
 450         assert(u);
 451
 452         while (u->meta.load_state == UNIT_MERGED)
 453                 assert_se(u = u->meta.merged_into);
 454
 455         return u;
 456 }
 457
 458 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 459         int r;
 460
 461         assert(u);
 462         assert(c);
 463
 464         if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG)
 465                 return 0;
 466
 467         /* If syslog or kernel logging is requested, make sure our own
 468          * logging daemon is run first. */
 469
 470         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
 471                 return r;
 472
 473         if (u->meta.manager->running_as != MANAGER_SESSION)
 474                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
 475                         return r;
 476
 477         return 0;
 478 }
 479
 480 const char* unit_id(Unit *u) {
 481         assert(u);
 482
 483         if (u->meta.id)
 484                 return u->meta.id;
 485
 486         return set_first(u->meta.names);
 487 }
 488
 489 const char *unit_description(Unit *u) {
 490         assert(u);
 491
 492         if (u->meta.description)
 493                 return u->meta.description;
 494
 495         return unit_id(u);
 496 }
 497
 498 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 499         char *t;
 500         UnitDependency d;
 501         Iterator i;
 502         char *p2;
 503         const char *prefix2;
 504         CGroupBonding *b;
 505
 506         assert(u);
 507
 508         if (!prefix)
 509                 prefix = "";
 510         p2 = strappend(prefix, "\t");
 511         prefix2 = p2 ? p2 : prefix;
 512
 513         fprintf(f,
 514                 "%s→ Unit %s:\n"
 515                 "%s\tDescription: %s\n"
 516                 "%s\tUnit Load State: %s\n"
 517                 "%s\tUnit Active State: %s\n",
 518                 prefix, unit_id(u),
 519                 prefix, unit_description(u),
 520                 prefix, unit_load_state_to_string(u->meta.load_state),
 521                 prefix, unit_active_state_to_string(unit_active_state(u)));
 522
 523         SET_FOREACH(t, u->meta.names, i)
 524                 fprintf(f, "%s\tName: %s\n", prefix, t);
 525
 526         if (u->meta.fragment_path)
 527                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 528
 529         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 530                 Unit *other;
 531
 532                 if (set_isempty(u->meta.dependencies[d]))
 533                         continue;
 534
 535                 SET_FOREACH(other, u->meta.dependencies[d], i)
 536                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 537         }
 538
 539         fprintf(f,
 540                 "%s\tRecursive Stop: %s\n"
 541                 "%s\tStop When Unneeded: %s\n",
 542                 prefix, yes_no(u->meta.recursive_stop),
 543                 prefix, yes_no(u->meta.stop_when_unneeded));
 544
 545         if (u->meta.load_state == UNIT_LOADED) {
 546                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 547                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 548                                 prefix, b->controller, b->path);
 549
 550                 if (UNIT_VTABLE(u)->dump)
 551                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 552         }
 553
 554         if (u->meta.job)
 555                 job_dump(u->meta.job, f, prefix2);
 556
 557         free(p2);
 558 }
 559
 560 /* Common implementation for multiple backends */
 561 int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) {
 562         int r;
 563
 564         assert(u);
 565         assert(new_state);
 566         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 567
 568         /* Load a .service file */
 569         if ((r = unit_load_fragment(u, new_state)) < 0)
 570                 return r;
 571
 572         if (*new_state == UNIT_STUB)
 573                 return -ENOENT;
 574
 575         /* Load drop-in directory data */
 576         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 577                 return r;
 578
 579         return 0;
 580 }
 581
 582 /* Common implementation for multiple backends */
 583 int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) {
 584         int r;
 585
 586         assert(u);
 587         assert(new_state);
 588         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 589
 590         /* Same as unit_load_fragment_and_dropin(), but whether
 591          * something can be loaded or not doesn't matter. */
 592
 593         /* Load a .service file */
 594         if ((r = unit_load_fragment(u, new_state)) < 0)
 595                 return r;
 596
 597         if (*new_state == UNIT_STUB)
 598                 *new_state = UNIT_LOADED;
 599
 600         /* Load drop-in directory data */
 601         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 602                 return r;
 603
 604         return 0;
 605 }
 606
 607 int unit_load(Unit *u) {
 608         int r;
 609         UnitLoadState res;
 610
 611         assert(u);
 612
 613         if (u->meta.in_load_queue) {
 614                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 615                 u->meta.in_load_queue = false;
 616         }
 617
 618         if (u->meta.load_state != UNIT_STUB)
 619                 return 0;
 620
 621         if (UNIT_VTABLE(u)->init) {
 622                 res = UNIT_STUB;
 623                 if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0)
 624                         goto fail;
 625         }
 626
 627         if (res == UNIT_STUB) {
 628                 r = -ENOENT;
 629                 goto fail;
 630         }
 631
 632         u->meta.load_state = res;
 633         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 634
 635         unit_add_to_dbus_queue(unit_follow_merge(u));
 636
 637         return 0;
 638
 639 fail:
 640         u->meta.load_state = UNIT_FAILED;
 641         unit_add_to_dbus_queue(u);
 642
 643         log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r));
 644
 645         return r;
 646 }
 647
 648 /* Errors:
 649  *         -EBADR:    This unit type does not support starting.
 650  *         -EALREADY: Unit is already started.
 651  *         -EAGAIN:   An operation is already in progress. Retry later.
 652  */
 653 int unit_start(Unit *u) {
 654         UnitActiveState state;
 655
 656         assert(u);
 657
 658         /* If this is already (being) started, then this will
 659          * succeed. Note that this will even succeed if this unit is
 660          * not startable by the user. This is relied on to detect when
 661          * we need to wait for units and when waiting is finished. */
 662         state = unit_active_state(u);
 663         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 664                 return -EALREADY;
 665
 666         /* If it is stopped, but we cannot start it, then fail */
 667         if (!UNIT_VTABLE(u)->start)
 668                 return -EBADR;
 669
 670         /* We don't suppress calls to ->start() here when we are
 671          * already starting, to allow this request to be used as a
 672          * "hurry up" call, for example when the unit is in some "auto
 673          * restart" state where it waits for a holdoff timer to elapse
 674          * before it will start again. */
 675
 676         unit_add_to_dbus_queue(u);
 677         return UNIT_VTABLE(u)->start(u);
 678 }
 679
 680 bool unit_can_start(Unit *u) {
 681         assert(u);
 682
 683         return !!UNIT_VTABLE(u)->start;
 684 }
 685
 686 /* Errors:
 687  *         -EBADR:    This unit type does not support stopping.
 688  *         -EALREADY: Unit is already stopped.
 689  *         -EAGAIN:   An operation is already in progress. Retry later.
 690  */
 691 int unit_stop(Unit *u) {
 692         UnitActiveState state;
 693
 694         assert(u);
 695
 696         state = unit_active_state(u);
 697         if (state == UNIT_INACTIVE)
 698                 return -EALREADY;
 699
 700         if (!UNIT_VTABLE(u)->stop)
 701                 return -EBADR;
 702
 703         if (state == UNIT_DEACTIVATING)
 704                 return 0;
 705
 706         unit_add_to_dbus_queue(u);
 707         return UNIT_VTABLE(u)->stop(u);
 708 }
 709
 710 /* Errors:
 711  *         -EBADR:    This unit type does not support reloading.
 712  *         -ENOEXEC:  Unit is not started.
 713  *         -EAGAIN:   An operation is already in progress. Retry later.
 714  */
 715 int unit_reload(Unit *u) {
 716         UnitActiveState state;
 717
 718         assert(u);
 719
 720         if (!unit_can_reload(u))
 721                 return -EBADR;
 722
 723         state = unit_active_state(u);
 724         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 725                 return -EALREADY;
 726
 727         if (unit_active_state(u) != UNIT_ACTIVE)
 728                 return -ENOEXEC;
 729
 730         unit_add_to_dbus_queue(u);
 731         return UNIT_VTABLE(u)->reload(u);
 732 }
 733
 734 bool unit_can_reload(Unit *u) {
 735         assert(u);
 736
 737         if (!UNIT_VTABLE(u)->reload)
 738                 return false;
 739
 740         if (!UNIT_VTABLE(u)->can_reload)
 741                 return true;
 742
 743         return UNIT_VTABLE(u)->can_reload(u);
 744 }
 745
 746 static void unit_check_uneeded(Unit *u) {
 747         Iterator i;
 748         Unit *other;
 749
 750         assert(u);
 751
 752         /* If this service shall be shut down when unneeded then do
 753          * so. */
 754
 755         if (!u->meta.stop_when_unneeded)
 756                 return;
 757
 758         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 759                 return;
 760
 761         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 762                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 763                         return;
 764
 765         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 766                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 767                         return;
 768
 769         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 770                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 771                         return;
 772
 773         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 774
 775         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 776         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 777 }
 778
 779 static void retroactively_start_dependencies(Unit *u) {
 780         Iterator i;
 781         Unit *other;
 782
 783         assert(u);
 784         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 785
 786         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 787                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 788                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 789
 790         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 791                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 792                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 793
 794         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 795                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 796                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 797
 798         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 799                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 800                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 801
 802         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 803                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 804                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 805 }
 806
 807 static void retroactively_stop_dependencies(Unit *u) {
 808         Iterator i;
 809         Unit *other;
 810
 811         assert(u);
 812         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 813
 814         if (u->meta.recursive_stop) {
 815                 /* Pull down units need us recursively if enabled */
 816                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 817                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 818                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 819         }
 820
 821         /* Garbage collect services that might not be needed anymore, if enabled */
 822         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 823                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 824                         unit_check_uneeded(other);
 825         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 826                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 827                         unit_check_uneeded(other);
 828         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 829                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 830                         unit_check_uneeded(other);
 831         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 832                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 833                         unit_check_uneeded(other);
 834         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
 835                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 836                         unit_check_uneeded(other);
 837 }
 838
 839 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 840         bool unexpected = false;
 841
 842         assert(u);
 843         assert(os < _UNIT_ACTIVE_STATE_MAX);
 844         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 845         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 846         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 847
 848         if (os == ns)
 849                 return;
 850
 851         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 852                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 853         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 854                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 855
 856         if (u->meta.job) {
 857
 858                 if (u->meta.job->state == JOB_WAITING)
 859
 860                         /* So we reached a different state for this
 861                          * job. Let's see if we can run it now if it
 862                          * failed previously due to EAGAIN. */
 863                         job_add_to_run_queue(u->meta.job);
 864
 865                 else {
 866                         assert(u->meta.job->state == JOB_RUNNING);
 867
 868                         /* Let's check whether this state change
 869                          * constitutes a finished job, or maybe
 870                          * cotradicts a running job and hence needs to
 871                          * invalidate jobs. */
 872
 873                         switch (u->meta.job->type) {
 874
 875                         case JOB_START:
 876                         case JOB_VERIFY_ACTIVE:
 877
 878                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
 879                                         job_finish_and_invalidate(u->meta.job, true);
 880                                 else if (ns != UNIT_ACTIVATING) {
 881                                         unexpected = true;
 882                                         job_finish_and_invalidate(u->meta.job, false);
 883                                 }
 884
 885                                 break;
 886
 887                         case JOB_RELOAD:
 888                         case JOB_RELOAD_OR_START:
 889
 890                                 if (ns == UNIT_ACTIVE)
 891                                         job_finish_and_invalidate(u->meta.job, true);
 892                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
 893                                         unexpected = true;
 894                                         job_finish_and_invalidate(u->meta.job, false);
 895                                 }
 896
 897                                 break;
 898
 899                         case JOB_STOP:
 900                         case JOB_RESTART:
 901                         case JOB_TRY_RESTART:
 902
 903                                 if (ns == UNIT_INACTIVE)
 904                                         job_finish_and_invalidate(u->meta.job, true);
 905                                 else if (ns != UNIT_DEACTIVATING) {
 906                                         unexpected = true;
 907                                         job_finish_and_invalidate(u->meta.job, false);
 908                                 }
 909
 910                                 break;
 911
 912                         default:
 913                                 assert_not_reached("Job type unknown");
 914                         }
 915                 }
 916         }
 917
 918         /* If this state change happened without being requested by a
 919          * job, then let's retroactively start or stop dependencies */
 920
 921         if (unexpected) {
 922                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 923                         retroactively_start_dependencies(u);
 924                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 925                         retroactively_stop_dependencies(u);
 926         }
 927
 928         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 929
 930                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
 931                         log_info("D-Bus became available, trying to reconnect.");
 932                         /* The bus just got started, hence try to connect to it. */
 933                         bus_init_system(u->meta.manager);
 934                         bus_init_api(u->meta.manager);
 935                 }
 936
 937                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) {
 938                         /* The syslog daemon just got started, hence try to connect to it. */
 939                         log_info("Syslog became available, trying to reconnect.");
 940                         log_open_syslog();
 941                 }
 942
 943         } else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 944
 945                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 946                         /* The syslog daemon just got terminated, hence try to disconnect from it. */
 947                         log_close_syslog();
 948
 949                 /* We don't care about D-Bus here, since we'll get an
 950                  * asynchronous notification for it anyway. */
 951         }
 952
 953         /* Maybe we finished startup and are now ready for being
 954          * stopped because unneeded? */
 955         unit_check_uneeded(u);
 956
 957         unit_add_to_dbus_queue(u);
 958 }
 959
 960 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 961         struct epoll_event ev;
 962
 963         assert(u);
 964         assert(fd >= 0);
 965         assert(w);
 966         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 967
 968         zero(ev);
 969         ev.data.ptr = w;
 970         ev.events = events;
 971
 972         if (epoll_ctl(u->meta.manager->epoll_fd,
 973                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 974                       fd,
 975                       &ev) < 0)
 976                 return -errno;
 977
 978         w->fd = fd;
 979         w->type = WATCH_FD;
 980         w->data.unit = u;
 981
 982         return 0;
 983 }
 984
 985 void unit_unwatch_fd(Unit *u, Watch *w) {
 986         assert(u);
 987         assert(w);
 988
 989         if (w->type == WATCH_INVALID)
 990                 return;
 991
 992         assert(w->type == WATCH_FD);
 993         assert(w->data.unit == u);
 994         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 995
 996         w->fd = -1;
 997         w->type = WATCH_INVALID;
 998         w->data.unit = NULL;
 999 }
1000
1001 int unit_watch_pid(Unit *u, pid_t pid) {
1002         assert(u);
1003         assert(pid >= 1);
1004
1005         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1006 }
1007
1008 void unit_unwatch_pid(Unit *u, pid_t pid) {
1009         assert(u);
1010         assert(pid >= 1);
1011
1012         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
1013 }
1014
1015 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1016         struct itimerspec its;
1017         int flags, fd;
1018         bool ours;
1019
1020         assert(u);
1021         assert(w);
1022         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1023
1024         /* This will try to reuse the old timer if there is one */
1025
1026         if (w->type == WATCH_TIMER) {
1027                 ours = false;
1028                 fd = w->fd;
1029         } else {
1030                 ours = true;
1031                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1032                         return -errno;
1033         }
1034
1035         zero(its);
1036
1037         if (delay <= 0) {
1038                 /* Set absolute time in the past, but not 0, since we
1039                  * don't want to disarm the timer */
1040                 its.it_value.tv_sec = 0;
1041                 its.it_value.tv_nsec = 1;
1042
1043                 flags = TFD_TIMER_ABSTIME;
1044         } else {
1045                 timespec_store(&its.it_value, delay);
1046                 flags = 0;
1047         }
1048
1049         /* This will also flush the elapse counter */
1050         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1051                 goto fail;
1052
1053         if (w->type == WATCH_INVALID) {
1054                 struct epoll_event ev;
1055
1056                 zero(ev);
1057                 ev.data.ptr = w;
1058                 ev.events = EPOLLIN;
1059
1060                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1061                         goto fail;
1062         }
1063
1064         w->fd = fd;
1065         w->type = WATCH_TIMER;
1066         w->data.unit = u;
1067
1068         return 0;
1069
1070 fail:
1071         if (ours)
1072                 close_nointr_nofail(fd);
1073
1074         return -errno;
1075 }
1076
1077 void unit_unwatch_timer(Unit *u, Watch *w) {
1078         assert(u);
1079         assert(w);
1080
1081         if (w->type == WATCH_INVALID)
1082                 return;
1083
1084         assert(w->type == WATCH_TIMER && w->data.unit == u);
1085
1086         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1087         assert_se(close_nointr(w->fd) == 0);
1088
1089         w->fd = -1;
1090         w->type = WATCH_INVALID;
1091         w->data.unit = NULL;
1092 }
1093
1094 bool unit_job_is_applicable(Unit *u, JobType j) {
1095         assert(u);
1096         assert(j >= 0 && j < _JOB_TYPE_MAX);
1097
1098         switch (j) {
1099
1100         case JOB_VERIFY_ACTIVE:
1101         case JOB_START:
1102                 return true;
1103
1104         case JOB_STOP:
1105         case JOB_RESTART:
1106         case JOB_TRY_RESTART:
1107                 return unit_can_start(u);
1108
1109         case JOB_RELOAD:
1110                 return unit_can_reload(u);
1111
1112         case JOB_RELOAD_OR_START:
1113                 return unit_can_reload(u) && unit_can_start(u);
1114
1115         default:
1116                 assert_not_reached("Invalid job type");
1117         }
1118 }
1119
1120 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1121
1122         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1123                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1124                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1125                 [UNIT_WANTS] = UNIT_WANTED_BY,
1126                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1127                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1128                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1129                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1130                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1131                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1132                 [UNIT_BEFORE] = UNIT_AFTER,
1133                 [UNIT_AFTER] = UNIT_BEFORE
1134         };
1135         int r;
1136
1137         assert(u);
1138         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1139         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1140         assert(other);
1141
1142         /* We won't allow dependencies on ourselves. We will not
1143          * consider them an error however. */
1144         if (u == other)
1145                 return 0;
1146
1147         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1148                 return r;
1149
1150         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1151                 return r;
1152
1153         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1154                 return r;
1155
1156         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1157                 set_remove(u->meta.dependencies[d], other);
1158                 return r;
1159         }
1160
1161         unit_add_to_dbus_queue(u);
1162         return 0;
1163 }
1164
1165 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
1166         Unit *other;
1167         int r;
1168
1169         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1170                 return r;
1171
1172         if ((r = unit_add_dependency(u, d, other)) < 0)
1173                 return r;
1174
1175         return 0;
1176 }
1177
1178 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1179         Unit *other;
1180         int r;
1181
1182         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1183                 return r;
1184
1185         if ((r = unit_add_dependency(other, d, u)) < 0)
1186                 return r;
1187
1188         return 0;
1189 }
1190
1191 int set_unit_path(const char *p) {
1192         char *cwd, *c;
1193         int r;
1194
1195         /* This is mostly for debug purposes */
1196
1197         if (path_is_absolute(p)) {
1198                 if (!(c = strdup(p)))
1199                         return -ENOMEM;
1200         } else {
1201                 if (!(cwd = get_current_dir_name()))
1202                         return -errno;
1203
1204                 r = asprintf(&c, "%s/%s", cwd, p);
1205                 free(cwd);
1206
1207                 if (r < 0)
1208                         return -ENOMEM;
1209         }
1210
1211         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1212                 r = -errno;
1213                 free(c);
1214                 return r;
1215         }
1216
1217         return 0;
1218 }
1219
1220 char *unit_name_escape_path(const char *path, const char *suffix) {
1221         char *r, *t;
1222         const char *f;
1223         size_t a, b;
1224
1225         assert(path);
1226
1227         /* Takes a path and a suffix and prefix and makes a nice
1228          * string suitable as unit name of it, escaping all weird
1229          * chars on the way.
1230          *
1231          * / becomes ., and all chars not alloweed in a unit name get
1232          * escaped as \xFF, including \ and ., of course. This
1233          * escaping is hence reversible.
1234          */
1235
1236         if (!suffix)
1237                 suffix = "";
1238
1239         a = strlen(path);
1240         b = strlen(suffix);
1241
1242         if (!(r = new(char, a*4+b+1)))
1243                 return NULL;
1244
1245         for (f = path, t = r; *f; f++) {
1246                 if (*f == '/')
1247                         *(t++) = '.';
1248                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1249                         *(t++) = '\\';
1250                         *(t++) = 'x';
1251                         *(t++) = hexchar(*f > 4);
1252                         *(t++) = hexchar(*f);
1253                 } else
1254                         *(t++) = *f;
1255         }
1256
1257         memcpy(t, suffix, b+1);
1258
1259         return r;
1260 }
1261
1262 char *unit_dbus_path(Unit *u) {
1263         char *p, *e;
1264
1265         assert(u);
1266
1267         if (!(e = bus_path_escape(unit_id(u))))
1268                 return NULL;
1269
1270         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1271                 free(e);
1272                 return NULL;
1273         }
1274
1275         free(e);
1276         return p;
1277 }
1278
1279 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1280         CGroupBonding *l;
1281         int r;
1282
1283         assert(u);
1284         assert(b);
1285         assert(b->path);
1286
1287         /* Ensure this hasn't been added yet */
1288         assert(!b->unit);
1289
1290         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1291         LIST_PREPEND(CGroupBonding, by_path, l, b);
1292
1293         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1294                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1295                 return r;
1296         }
1297
1298         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1299         b->unit = u;
1300
1301         return 0;
1302 }
1303
1304 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1305         size_t n;
1306         const char *p;
1307         char *controller;
1308         CGroupBonding *b;
1309         int r;
1310
1311         assert(u);
1312         assert(name);
1313
1314         /* Detect controller name */
1315         n = strcspn(name, ":/");
1316
1317         /* Only controller name, no path? No path? */
1318         if (name[n] == 0)
1319                 return -EINVAL;
1320
1321         if (n > 0) {
1322                 if (name[n] != ':')
1323                         return -EINVAL;
1324
1325                 p = name+n+1;
1326         } else
1327                 p = name;
1328
1329         /* Insist in absolute paths */
1330         if (p[0] != '/')
1331                 return -EINVAL;
1332
1333         if (!(controller = strndup(name, n)))
1334                 return -ENOMEM;
1335
1336         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1337                 free(controller);
1338                 return -EEXIST;
1339         }
1340
1341         if (!(b = new0(CGroupBonding, 1))) {
1342                 free(controller);
1343                 return -ENOMEM;
1344         }
1345
1346         b->controller = controller;
1347
1348         if (!(b->path = strdup(p))) {
1349                 r = -ENOMEM;
1350                 goto fail;
1351         }
1352
1353         b->only_us = false;
1354         b->clean_up = false;
1355
1356         if ((r = unit_add_cgroup(u, b)) < 0)
1357                 goto fail;
1358
1359         return 0;
1360
1361 fail:
1362         free(b->path);
1363         free(b->controller);
1364         free(b);
1365
1366         return r;
1367 }
1368
1369 int unit_add_default_cgroup(Unit *u) {
1370         CGroupBonding *b;
1371         int r = -ENOMEM;
1372
1373         assert(u);
1374
1375         /* Adds in the default cgroup data, if it wasn't specified yet */
1376
1377         if (unit_get_default_cgroup(u))
1378                 return 0;
1379
1380         if (!(b = new0(CGroupBonding, 1)))
1381                 return -ENOMEM;
1382
1383         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1384                 goto fail;
1385
1386         if (asprintf(&b->path, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1387                 goto fail;
1388
1389         b->clean_up = true;
1390         b->only_us = true;
1391
1392         if ((r = unit_add_cgroup(u, b)) < 0)
1393                 goto fail;
1394
1395         return 0;
1396
1397 fail:
1398         free(b->path);
1399         free(b->controller);
1400         free(b);
1401
1402         return r;
1403 }
1404
1405 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1406         assert(u);
1407
1408         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1409 }
1410
1411 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1412         [UNIT_SERVICE] = "service",
1413         [UNIT_TIMER] = "timer",
1414         [UNIT_SOCKET] = "socket",
1415         [UNIT_TARGET] = "target",
1416         [UNIT_DEVICE] = "device",
1417         [UNIT_MOUNT] = "mount",
1418         [UNIT_AUTOMOUNT] = "automount",
1419         [UNIT_SNAPSHOT] = "snapshot"
1420 };
1421
1422 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1423
1424 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1425         [UNIT_STUB] = "stub",
1426         [UNIT_LOADED] = "loaded",
1427         [UNIT_FAILED] = "failed",
1428         [UNIT_MERGED] = "merged"
1429 };
1430
1431 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1432
1433 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1434         [UNIT_ACTIVE] = "active",
1435         [UNIT_INACTIVE] = "inactive",
1436         [UNIT_ACTIVATING] = "activating",
1437         [UNIT_DEACTIVATING] = "deactivating"
1438 };
1439
1440 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1441
1442 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1443         [UNIT_REQUIRES] = "Requires",
1444         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1445         [UNIT_WANTS] = "Wants",
1446         [UNIT_REQUISITE] = "Requisite",
1447         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1448         [UNIT_REQUIRED_BY] = "RequiredBy",
1449         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1450         [UNIT_WANTED_BY] = "WantedBy",
1451         [UNIT_CONFLICTS] = "Conflicts",
1452         [UNIT_BEFORE] = "Before",
1453         [UNIT_AFTER] = "After",
1454 };
1455
1456 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1457
1458 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1459         [KILL_PROCESS] = "process",
1460         [KILL_PROCESS_GROUP] = "process-group",
1461         [KILL_CONTROL_GROUP] = "control-group"
1462 };
1463
1464 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);