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         other->meta.load_state = UNIT_MERGED;
 428         other->meta.merged_into = u;
 429
 430         /* If there is still some data attached to the other node, we
 431          * don't need it anymore, and can free it. */
 432         if (other->meta.load_state != UNIT_STUB)
 433                 if (UNIT_VTABLE(other)->done)
 434                         UNIT_VTABLE(other)->done(other);
 435
 436         unit_add_to_dbus_queue(u);
 437         unit_add_to_cleanup_queue(other);
 438
 439         return 0;
 440 }
 441
 442 int unit_merge_by_name(Unit *u, const char *name) {
 443         Unit *other;
 444
 445         assert(u);
 446         assert(name);
 447
 448         if (!(other = manager_get_unit(u->meta.manager, name)))
 449                 return unit_add_name(u, name);
 450
 451         return unit_merge(u, other);
 452 }
 453
 454 Unit* unit_follow_merge(Unit *u) {
 455         assert(u);
 456
 457         while (u->meta.load_state == UNIT_MERGED)
 458                 assert_se(u = u->meta.merged_into);
 459
 460         return u;
 461 }
 462
 463 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 464         int r;
 465
 466         assert(u);
 467         assert(c);
 468
 469         if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG)
 470                 return 0;
 471
 472         /* If syslog or kernel logging is requested, make sure our own
 473          * logging daemon is run first. */
 474
 475         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
 476                 return r;
 477
 478         if (u->meta.manager->running_as != MANAGER_SESSION)
 479                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
 480                         return r;
 481
 482         return 0;
 483 }
 484
 485 const char* unit_id(Unit *u) {
 486         assert(u);
 487
 488         if (u->meta.id)
 489                 return u->meta.id;
 490
 491         return set_first(u->meta.names);
 492 }
 493
 494 const char *unit_description(Unit *u) {
 495         assert(u);
 496
 497         if (u->meta.description)
 498                 return u->meta.description;
 499
 500         return unit_id(u);
 501 }
 502
 503 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 504         char *t;
 505         UnitDependency d;
 506         Iterator i;
 507         char *p2;
 508         const char *prefix2;
 509         CGroupBonding *b;
 510
 511         assert(u);
 512
 513         if (!prefix)
 514                 prefix = "";
 515         p2 = strappend(prefix, "\t");
 516         prefix2 = p2 ? p2 : prefix;
 517
 518         fprintf(f,
 519                 "%s→ Unit %s:\n"
 520                 "%s\tDescription: %s\n"
 521                 "%s\tUnit Load State: %s\n"
 522                 "%s\tUnit Active State: %s\n",
 523                 prefix, unit_id(u),
 524                 prefix, unit_description(u),
 525                 prefix, unit_load_state_to_string(u->meta.load_state),
 526                 prefix, unit_active_state_to_string(unit_active_state(u)));
 527
 528         SET_FOREACH(t, u->meta.names, i)
 529                 fprintf(f, "%s\tName: %s\n", prefix, t);
 530
 531         if (u->meta.fragment_path)
 532                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 533
 534         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 535                 Unit *other;
 536
 537                 if (set_isempty(u->meta.dependencies[d]))
 538                         continue;
 539
 540                 SET_FOREACH(other, u->meta.dependencies[d], i)
 541                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 542         }
 543
 544         fprintf(f,
 545                 "%s\tRecursive Stop: %s\n"
 546                 "%s\tStop When Unneeded: %s\n",
 547                 prefix, yes_no(u->meta.recursive_stop),
 548                 prefix, yes_no(u->meta.stop_when_unneeded));
 549
 550         if (u->meta.load_state == UNIT_LOADED) {
 551                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 552                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 553                                 prefix, b->controller, b->path);
 554
 555                 if (UNIT_VTABLE(u)->dump)
 556                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 557         }
 558
 559         if (u->meta.job)
 560                 job_dump(u->meta.job, f, prefix2);
 561
 562         free(p2);
 563 }
 564
 565 /* Common implementation for multiple backends */
 566 int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) {
 567         int r;
 568
 569         assert(u);
 570         assert(new_state);
 571         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 572
 573         /* Load a .service file */
 574         if ((r = unit_load_fragment(u, new_state)) < 0)
 575                 return r;
 576
 577         if (*new_state == UNIT_STUB)
 578                 return -ENOENT;
 579
 580         /* Load drop-in directory data */
 581         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 582                 return r;
 583
 584         return 0;
 585 }
 586
 587 /* Common implementation for multiple backends */
 588 int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) {
 589         int r;
 590
 591         assert(u);
 592         assert(new_state);
 593         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 594
 595         /* Same as unit_load_fragment_and_dropin(), but whether
 596          * something can be loaded or not doesn't matter. */
 597
 598         /* Load a .service file */
 599         if ((r = unit_load_fragment(u, new_state)) < 0)
 600                 return r;
 601
 602         if (*new_state == UNIT_STUB)
 603                 *new_state = UNIT_LOADED;
 604
 605         /* Load drop-in directory data */
 606         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 607                 return r;
 608
 609         return 0;
 610 }
 611
 612 int unit_load(Unit *u) {
 613         int r;
 614         UnitLoadState res;
 615
 616         assert(u);
 617
 618         if (u->meta.in_load_queue) {
 619                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 620                 u->meta.in_load_queue = false;
 621         }
 622
 623         if (u->meta.load_state != UNIT_STUB)
 624                 return 0;
 625
 626         if (UNIT_VTABLE(u)->init) {
 627                 res = UNIT_STUB;
 628                 if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0)
 629                         goto fail;
 630         }
 631
 632         if (res == UNIT_STUB) {
 633                 r = -ENOENT;
 634                 goto fail;
 635         }
 636
 637         u->meta.load_state = res;
 638         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 639
 640         unit_add_to_dbus_queue(unit_follow_merge(u));
 641
 642         return 0;
 643
 644 fail:
 645         u->meta.load_state = UNIT_FAILED;
 646         unit_add_to_dbus_queue(u);
 647
 648         log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r));
 649
 650         return r;
 651 }
 652
 653 /* Errors:
 654  *         -EBADR:    This unit type does not support starting.
 655  *         -EALREADY: Unit is already started.
 656  *         -EAGAIN:   An operation is already in progress. Retry later.
 657  */
 658 int unit_start(Unit *u) {
 659         UnitActiveState state;
 660
 661         assert(u);
 662
 663         /* If this is already (being) started, then this will
 664          * succeed. Note that this will even succeed if this unit is
 665          * not startable by the user. This is relied on to detect when
 666          * we need to wait for units and when waiting is finished. */
 667         state = unit_active_state(u);
 668         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 669                 return -EALREADY;
 670
 671         /* If it is stopped, but we cannot start it, then fail */
 672         if (!UNIT_VTABLE(u)->start)
 673                 return -EBADR;
 674
 675         /* We don't suppress calls to ->start() here when we are
 676          * already starting, to allow this request to be used as a
 677          * "hurry up" call, for example when the unit is in some "auto
 678          * restart" state where it waits for a holdoff timer to elapse
 679          * before it will start again. */
 680
 681         unit_add_to_dbus_queue(u);
 682         return UNIT_VTABLE(u)->start(u);
 683 }
 684
 685 bool unit_can_start(Unit *u) {
 686         assert(u);
 687
 688         return !!UNIT_VTABLE(u)->start;
 689 }
 690
 691 /* Errors:
 692  *         -EBADR:    This unit type does not support stopping.
 693  *         -EALREADY: Unit is already stopped.
 694  *         -EAGAIN:   An operation is already in progress. Retry later.
 695  */
 696 int unit_stop(Unit *u) {
 697         UnitActiveState state;
 698
 699         assert(u);
 700
 701         state = unit_active_state(u);
 702         if (state == UNIT_INACTIVE)
 703                 return -EALREADY;
 704
 705         if (!UNIT_VTABLE(u)->stop)
 706                 return -EBADR;
 707
 708         if (state == UNIT_DEACTIVATING)
 709                 return 0;
 710
 711         unit_add_to_dbus_queue(u);
 712         return UNIT_VTABLE(u)->stop(u);
 713 }
 714
 715 /* Errors:
 716  *         -EBADR:    This unit type does not support reloading.
 717  *         -ENOEXEC:  Unit is not started.
 718  *         -EAGAIN:   An operation is already in progress. Retry later.
 719  */
 720 int unit_reload(Unit *u) {
 721         UnitActiveState state;
 722
 723         assert(u);
 724
 725         if (!unit_can_reload(u))
 726                 return -EBADR;
 727
 728         state = unit_active_state(u);
 729         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 730                 return -EALREADY;
 731
 732         if (unit_active_state(u) != UNIT_ACTIVE)
 733                 return -ENOEXEC;
 734
 735         unit_add_to_dbus_queue(u);
 736         return UNIT_VTABLE(u)->reload(u);
 737 }
 738
 739 bool unit_can_reload(Unit *u) {
 740         assert(u);
 741
 742         if (!UNIT_VTABLE(u)->reload)
 743                 return false;
 744
 745         if (!UNIT_VTABLE(u)->can_reload)
 746                 return true;
 747
 748         return UNIT_VTABLE(u)->can_reload(u);
 749 }
 750
 751 static void unit_check_uneeded(Unit *u) {
 752         Iterator i;
 753         Unit *other;
 754
 755         assert(u);
 756
 757         /* If this service shall be shut down when unneeded then do
 758          * so. */
 759
 760         if (!u->meta.stop_when_unneeded)
 761                 return;
 762
 763         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 764                 return;
 765
 766         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 767                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 768                         return;
 769
 770         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 771                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 772                         return;
 773
 774         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 775                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 776                         return;
 777
 778         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 779
 780         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 781         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 782 }
 783
 784 static void retroactively_start_dependencies(Unit *u) {
 785         Iterator i;
 786         Unit *other;
 787
 788         assert(u);
 789         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 790
 791         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 792                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 793                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 794
 795         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 796                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 797                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 798
 799         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 800                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 801                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 802
 803         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 804                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 805                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 806
 807         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 808                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 809                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 810 }
 811
 812 static void retroactively_stop_dependencies(Unit *u) {
 813         Iterator i;
 814         Unit *other;
 815
 816         assert(u);
 817         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 818
 819         if (u->meta.recursive_stop) {
 820                 /* Pull down units need us recursively if enabled */
 821                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 822                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 823                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 824         }
 825
 826         /* Garbage collect services that might not be needed anymore, if enabled */
 827         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 828                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 829                         unit_check_uneeded(other);
 830         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 831                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 832                         unit_check_uneeded(other);
 833         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 834                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 835                         unit_check_uneeded(other);
 836         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 837                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 838                         unit_check_uneeded(other);
 839         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
 840                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 841                         unit_check_uneeded(other);
 842 }
 843
 844 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 845         bool unexpected = false;
 846
 847         assert(u);
 848         assert(os < _UNIT_ACTIVE_STATE_MAX);
 849         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 850         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 851         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 852
 853         if (os == ns)
 854                 return;
 855
 856         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 857                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 858         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 859                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 860
 861         if (u->meta.job) {
 862
 863                 if (u->meta.job->state == JOB_WAITING)
 864
 865                         /* So we reached a different state for this
 866                          * job. Let's see if we can run it now if it
 867                          * failed previously due to EAGAIN. */
 868                         job_add_to_run_queue(u->meta.job);
 869
 870                 else {
 871                         assert(u->meta.job->state == JOB_RUNNING);
 872
 873                         /* Let's check whether this state change
 874                          * constitutes a finished job, or maybe
 875                          * cotradicts a running job and hence needs to
 876                          * invalidate jobs. */
 877
 878                         switch (u->meta.job->type) {
 879
 880                         case JOB_START:
 881                         case JOB_VERIFY_ACTIVE:
 882
 883                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
 884                                         job_finish_and_invalidate(u->meta.job, true);
 885                                 else if (ns != UNIT_ACTIVATING) {
 886                                         unexpected = true;
 887                                         job_finish_and_invalidate(u->meta.job, false);
 888                                 }
 889
 890                                 break;
 891
 892                         case JOB_RELOAD:
 893                         case JOB_RELOAD_OR_START:
 894
 895                                 if (ns == UNIT_ACTIVE)
 896                                         job_finish_and_invalidate(u->meta.job, true);
 897                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
 898                                         unexpected = true;
 899                                         job_finish_and_invalidate(u->meta.job, false);
 900                                 }
 901
 902                                 break;
 903
 904                         case JOB_STOP:
 905                         case JOB_RESTART:
 906                         case JOB_TRY_RESTART:
 907
 908                                 if (ns == UNIT_INACTIVE)
 909                                         job_finish_and_invalidate(u->meta.job, true);
 910                                 else if (ns != UNIT_DEACTIVATING) {
 911                                         unexpected = true;
 912                                         job_finish_and_invalidate(u->meta.job, false);
 913                                 }
 914
 915                                 break;
 916
 917                         default:
 918                                 assert_not_reached("Job type unknown");
 919                         }
 920                 }
 921         }
 922
 923         /* If this state change happened without being requested by a
 924          * job, then let's retroactively start or stop dependencies */
 925
 926         if (unexpected) {
 927                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 928                         retroactively_start_dependencies(u);
 929                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 930                         retroactively_stop_dependencies(u);
 931         }
 932
 933         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 934
 935                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
 936                         log_info("D-Bus became available, trying to reconnect.");
 937                         /* The bus just got started, hence try to connect to it. */
 938                         bus_init_system(u->meta.manager);
 939                         bus_init_api(u->meta.manager);
 940                 }
 941
 942                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) {
 943                         /* The syslog daemon just got started, hence try to connect to it. */
 944                         log_info("Syslog became available, trying to reconnect.");
 945                         log_open_syslog();
 946                 }
 947
 948         } else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 949
 950                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 951                         /* The syslog daemon just got terminated, hence try to disconnect from it. */
 952                         log_close_syslog();
 953
 954                 /* We don't care about D-Bus here, since we'll get an
 955                  * asynchronous notification for it anyway. */
 956         }
 957
 958         /* Maybe we finished startup and are now ready for being
 959          * stopped because unneeded? */
 960         unit_check_uneeded(u);
 961
 962         unit_add_to_dbus_queue(u);
 963 }
 964
 965 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 966         struct epoll_event ev;
 967
 968         assert(u);
 969         assert(fd >= 0);
 970         assert(w);
 971         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 972
 973         zero(ev);
 974         ev.data.ptr = w;
 975         ev.events = events;
 976
 977         if (epoll_ctl(u->meta.manager->epoll_fd,
 978                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 979                       fd,
 980                       &ev) < 0)
 981                 return -errno;
 982
 983         w->fd = fd;
 984         w->type = WATCH_FD;
 985         w->data.unit = u;
 986
 987         return 0;
 988 }
 989
 990 void unit_unwatch_fd(Unit *u, Watch *w) {
 991         assert(u);
 992         assert(w);
 993
 994         if (w->type == WATCH_INVALID)
 995                 return;
 996
 997         assert(w->type == WATCH_FD);
 998         assert(w->data.unit == u);
 999         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1000
1001         w->fd = -1;
1002         w->type = WATCH_INVALID;
1003         w->data.unit = NULL;
1004 }
1005
1006 int unit_watch_pid(Unit *u, pid_t pid) {
1007         assert(u);
1008         assert(pid >= 1);
1009
1010         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1011 }
1012
1013 void unit_unwatch_pid(Unit *u, pid_t pid) {
1014         assert(u);
1015         assert(pid >= 1);
1016
1017         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
1018 }
1019
1020 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1021         struct itimerspec its;
1022         int flags, fd;
1023         bool ours;
1024
1025         assert(u);
1026         assert(w);
1027         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1028
1029         /* This will try to reuse the old timer if there is one */
1030
1031         if (w->type == WATCH_TIMER) {
1032                 ours = false;
1033                 fd = w->fd;
1034         } else {
1035                 ours = true;
1036                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1037                         return -errno;
1038         }
1039
1040         zero(its);
1041
1042         if (delay <= 0) {
1043                 /* Set absolute time in the past, but not 0, since we
1044                  * don't want to disarm the timer */
1045                 its.it_value.tv_sec = 0;
1046                 its.it_value.tv_nsec = 1;
1047
1048                 flags = TFD_TIMER_ABSTIME;
1049         } else {
1050                 timespec_store(&its.it_value, delay);
1051                 flags = 0;
1052         }
1053
1054         /* This will also flush the elapse counter */
1055         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1056                 goto fail;
1057
1058         if (w->type == WATCH_INVALID) {
1059                 struct epoll_event ev;
1060
1061                 zero(ev);
1062                 ev.data.ptr = w;
1063                 ev.events = EPOLLIN;
1064
1065                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1066                         goto fail;
1067         }
1068
1069         w->fd = fd;
1070         w->type = WATCH_TIMER;
1071         w->data.unit = u;
1072
1073         return 0;
1074
1075 fail:
1076         if (ours)
1077                 close_nointr_nofail(fd);
1078
1079         return -errno;
1080 }
1081
1082 void unit_unwatch_timer(Unit *u, Watch *w) {
1083         assert(u);
1084         assert(w);
1085
1086         if (w->type == WATCH_INVALID)
1087                 return;
1088
1089         assert(w->type == WATCH_TIMER && w->data.unit == u);
1090
1091         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1092         assert_se(close_nointr(w->fd) == 0);
1093
1094         w->fd = -1;
1095         w->type = WATCH_INVALID;
1096         w->data.unit = NULL;
1097 }
1098
1099 bool unit_job_is_applicable(Unit *u, JobType j) {
1100         assert(u);
1101         assert(j >= 0 && j < _JOB_TYPE_MAX);
1102
1103         switch (j) {
1104
1105         case JOB_VERIFY_ACTIVE:
1106         case JOB_START:
1107                 return true;
1108
1109         case JOB_STOP:
1110         case JOB_RESTART:
1111         case JOB_TRY_RESTART:
1112                 return unit_can_start(u);
1113
1114         case JOB_RELOAD:
1115                 return unit_can_reload(u);
1116
1117         case JOB_RELOAD_OR_START:
1118                 return unit_can_reload(u) && unit_can_start(u);
1119
1120         default:
1121                 assert_not_reached("Invalid job type");
1122         }
1123 }
1124
1125 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1126
1127         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1128                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1129                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1130                 [UNIT_WANTS] = UNIT_WANTED_BY,
1131                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1132                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1133                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1134                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1135                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1136                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1137                 [UNIT_BEFORE] = UNIT_AFTER,
1138                 [UNIT_AFTER] = UNIT_BEFORE
1139         };
1140         int r;
1141
1142         assert(u);
1143         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1144         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1145         assert(other);
1146
1147         /* We won't allow dependencies on ourselves. We will not
1148          * consider them an error however. */
1149         if (u == other)
1150                 return 0;
1151
1152         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1153                 return r;
1154
1155         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1156                 return r;
1157
1158         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1159                 return r;
1160
1161         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1162                 set_remove(u->meta.dependencies[d], other);
1163                 return r;
1164         }
1165
1166         unit_add_to_dbus_queue(u);
1167         return 0;
1168 }
1169
1170 int unit_add_dependency_by_name(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(u, d, other)) < 0)
1178                 return r;
1179
1180         return 0;
1181 }
1182
1183 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1184         Unit *other;
1185         int r;
1186
1187         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1188                 return r;
1189
1190         if ((r = unit_add_dependency(other, d, u)) < 0)
1191                 return r;
1192
1193         return 0;
1194 }
1195
1196 int set_unit_path(const char *p) {
1197         char *cwd, *c;
1198         int r;
1199
1200         /* This is mostly for debug purposes */
1201
1202         if (path_is_absolute(p)) {
1203                 if (!(c = strdup(p)))
1204                         return -ENOMEM;
1205         } else {
1206                 if (!(cwd = get_current_dir_name()))
1207                         return -errno;
1208
1209                 r = asprintf(&c, "%s/%s", cwd, p);
1210                 free(cwd);
1211
1212                 if (r < 0)
1213                         return -ENOMEM;
1214         }
1215
1216         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1217                 r = -errno;
1218                 free(c);
1219                 return r;
1220         }
1221
1222         return 0;
1223 }
1224
1225 char *unit_name_escape_path(const char *path, const char *suffix) {
1226         char *r, *t;
1227         const char *f;
1228         size_t a, b;
1229
1230         assert(path);
1231
1232         /* Takes a path and a suffix and prefix and makes a nice
1233          * string suitable as unit name of it, escaping all weird
1234          * chars on the way.
1235          *
1236          * / becomes ., and all chars not alloweed in a unit name get
1237          * escaped as \xFF, including \ and ., of course. This
1238          * escaping is hence reversible.
1239          */
1240
1241         if (!suffix)
1242                 suffix = "";
1243
1244         a = strlen(path);
1245         b = strlen(suffix);
1246
1247         if (!(r = new(char, a*4+b+1)))
1248                 return NULL;
1249
1250         for (f = path, t = r; *f; f++) {
1251                 if (*f == '/')
1252                         *(t++) = '.';
1253                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1254                         *(t++) = '\\';
1255                         *(t++) = 'x';
1256                         *(t++) = hexchar(*f > 4);
1257                         *(t++) = hexchar(*f);
1258                 } else
1259                         *(t++) = *f;
1260         }
1261
1262         memcpy(t, suffix, b+1);
1263
1264         return r;
1265 }
1266
1267 char *unit_dbus_path(Unit *u) {
1268         char *p, *e;
1269
1270         assert(u);
1271
1272         if (!(e = bus_path_escape(unit_id(u))))
1273                 return NULL;
1274
1275         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1276                 free(e);
1277                 return NULL;
1278         }
1279
1280         free(e);
1281         return p;
1282 }
1283
1284 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1285         CGroupBonding *l;
1286         int r;
1287
1288         assert(u);
1289         assert(b);
1290         assert(b->path);
1291
1292         /* Ensure this hasn't been added yet */
1293         assert(!b->unit);
1294
1295         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1296         LIST_PREPEND(CGroupBonding, by_path, l, b);
1297
1298         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1299                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1300                 return r;
1301         }
1302
1303         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1304         b->unit = u;
1305
1306         return 0;
1307 }
1308
1309 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1310         size_t n;
1311         const char *p;
1312         char *controller;
1313         CGroupBonding *b;
1314         int r;
1315
1316         assert(u);
1317         assert(name);
1318
1319         /* Detect controller name */
1320         n = strcspn(name, ":/");
1321
1322         /* Only controller name, no path? No path? */
1323         if (name[n] == 0)
1324                 return -EINVAL;
1325
1326         if (n > 0) {
1327                 if (name[n] != ':')
1328                         return -EINVAL;
1329
1330                 p = name+n+1;
1331         } else
1332                 p = name;
1333
1334         /* Insist in absolute paths */
1335         if (p[0] != '/')
1336                 return -EINVAL;
1337
1338         if (!(controller = strndup(name, n)))
1339                 return -ENOMEM;
1340
1341         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1342                 free(controller);
1343                 return -EEXIST;
1344         }
1345
1346         if (!(b = new0(CGroupBonding, 1))) {
1347                 free(controller);
1348                 return -ENOMEM;
1349         }
1350
1351         b->controller = controller;
1352
1353         if (!(b->path = strdup(p))) {
1354                 r = -ENOMEM;
1355                 goto fail;
1356         }
1357
1358         b->only_us = false;
1359         b->clean_up = false;
1360
1361         if ((r = unit_add_cgroup(u, b)) < 0)
1362                 goto fail;
1363
1364         return 0;
1365
1366 fail:
1367         free(b->path);
1368         free(b->controller);
1369         free(b);
1370
1371         return r;
1372 }
1373
1374 int unit_add_default_cgroup(Unit *u) {
1375         CGroupBonding *b;
1376         int r = -ENOMEM;
1377
1378         assert(u);
1379
1380         /* Adds in the default cgroup data, if it wasn't specified yet */
1381
1382         if (unit_get_default_cgroup(u))
1383                 return 0;
1384
1385         if (!(b = new0(CGroupBonding, 1)))
1386                 return -ENOMEM;
1387
1388         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1389                 goto fail;
1390
1391         if (asprintf(&b->path, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1392                 goto fail;
1393
1394         b->clean_up = true;
1395         b->only_us = true;
1396
1397         if ((r = unit_add_cgroup(u, b)) < 0)
1398                 goto fail;
1399
1400         return 0;
1401
1402 fail:
1403         free(b->path);
1404         free(b->controller);
1405         free(b);
1406
1407         return r;
1408 }
1409
1410 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1411         assert(u);
1412
1413         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1414 }
1415
1416 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1417         [UNIT_SERVICE] = "service",
1418         [UNIT_TIMER] = "timer",
1419         [UNIT_SOCKET] = "socket",
1420         [UNIT_TARGET] = "target",
1421         [UNIT_DEVICE] = "device",
1422         [UNIT_MOUNT] = "mount",
1423         [UNIT_AUTOMOUNT] = "automount",
1424         [UNIT_SNAPSHOT] = "snapshot"
1425 };
1426
1427 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1428
1429 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1430         [UNIT_STUB] = "stub",
1431         [UNIT_LOADED] = "loaded",
1432         [UNIT_FAILED] = "failed",
1433         [UNIT_MERGED] = "merged"
1434 };
1435
1436 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1437
1438 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1439         [UNIT_ACTIVE] = "active",
1440         [UNIT_INACTIVE] = "inactive",
1441         [UNIT_ACTIVATING] = "activating",
1442         [UNIT_DEACTIVATING] = "deactivating"
1443 };
1444
1445 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1446
1447 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1448         [UNIT_REQUIRES] = "Requires",
1449         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1450         [UNIT_WANTS] = "Wants",
1451         [UNIT_REQUISITE] = "Requisite",
1452         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1453         [UNIT_REQUIRED_BY] = "RequiredBy",
1454         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1455         [UNIT_WANTED_BY] = "WantedBy",
1456         [UNIT_CONFLICTS] = "Conflicts",
1457         [UNIT_BEFORE] = "Before",
1458         [UNIT_AFTER] = "After",
1459 };
1460
1461 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1462
1463 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1464         [KILL_PROCESS] = "process",
1465         [KILL_PROCESS_GROUP] = "process-group",
1466         [KILL_CONTROL_GROUP] = "control-group"
1467 };
1468
1469 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);