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