src/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 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44
  45 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  46         [UNIT_SERVICE] = &service_vtable,
  47         [UNIT_TIMER] = &timer_vtable,
  48         [UNIT_SOCKET] = &socket_vtable,
  49         [UNIT_TARGET] = &target_vtable,
  50         [UNIT_DEVICE] = &device_vtable,
  51         [UNIT_MOUNT] = &mount_vtable,
  52         [UNIT_AUTOMOUNT] = &automount_vtable,
  53         [UNIT_SNAPSHOT] = &snapshot_vtable,
  54         [UNIT_SWAP] = &swap_vtable,
  55         [UNIT_PATH] = &path_vtable
  56 };
  57
  58 Unit *unit_new(Manager *m) {
  59         Unit *u;
  60
  61         assert(m);
  62
  63         if (!(u = new0(Unit, 1)))
  64                 return NULL;
  65
  66         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  67                 free(u);
  68                 return NULL;
  69         }
  70
  71         u->meta.manager = m;
  72         u->meta.type = _UNIT_TYPE_INVALID;
  73         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  74         u->meta.default_dependencies = true;
  75
  76         return u;
  77 }
  78
  79 bool unit_has_name(Unit *u, const char *name) {
  80         assert(u);
  81         assert(name);
  82
  83         return !!set_get(u->meta.names, (char*) name);
  84 }
  85
  86 int unit_add_name(Unit *u, const char *text) {
  87         UnitType t;
  88         char *s, *i = NULL;
  89         int r;
  90
  91         assert(u);
  92         assert(text);
  93
  94         if (unit_name_is_template(text)) {
  95                 if (!u->meta.instance)
  96                         return -EINVAL;
  97
  98                 s = unit_name_replace_instance(text, u->meta.instance);
  99         } else
 100                 s = strdup(text);
 101
 102         if (!s)
 103                 return -ENOMEM;
 104
 105         if (!unit_name_is_valid(s)) {
 106                 r = -EINVAL;
 107                 goto fail;
 108         }
 109
 110         assert_se((t = unit_name_to_type(s)) >= 0);
 111
 112         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 113                 r = -EINVAL;
 114                 goto fail;
 115         }
 116
 117         if ((r = unit_name_to_instance(s, &i)) < 0)
 118                 goto fail;
 119
 120         if (i && unit_vtable[t]->no_instances)
 121                 goto fail;
 122
 123         /* Ensure that this unit is either instanced or not instanced,
 124          * but not both. */
 125         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 126                 r = -EINVAL;
 127                 goto fail;
 128         }
 129
 130         if (unit_vtable[t]->no_alias &&
 131             !set_isempty(u->meta.names) &&
 132             !set_get(u->meta.names, s)) {
 133                 r = -EEXIST;
 134                 goto fail;
 135         }
 136
 137         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 138                 r = -E2BIG;
 139                 goto fail;
 140         }
 141
 142         if ((r = set_put(u->meta.names, s)) < 0) {
 143                 if (r == -EEXIST)
 144                         r = 0;
 145                 goto fail;
 146         }
 147
 148         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 149                 set_remove(u->meta.names, s);
 150                 goto fail;
 151         }
 152
 153         if (u->meta.type == _UNIT_TYPE_INVALID) {
 154
 155                 u->meta.type = t;
 156                 u->meta.id = s;
 157                 u->meta.instance = i;
 158
 159                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 160
 161                 if (UNIT_VTABLE(u)->init)
 162                         UNIT_VTABLE(u)->init(u);
 163         } else
 164                 free(i);
 165
 166         unit_add_to_dbus_queue(u);
 167         return 0;
 168
 169 fail:
 170         free(s);
 171         free(i);
 172
 173         return r;
 174 }
 175
 176 int unit_choose_id(Unit *u, const char *name) {
 177         char *s, *t = NULL, *i;
 178         int r;
 179
 180         assert(u);
 181         assert(name);
 182
 183         if (unit_name_is_template(name)) {
 184
 185                 if (!u->meta.instance)
 186                         return -EINVAL;
 187
 188                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 189                         return -ENOMEM;
 190
 191                 name = t;
 192         }
 193
 194         /* Selects one of the names of this unit as the id */
 195         s = set_get(u->meta.names, (char*) name);
 196         free(t);
 197
 198         if (!s)
 199                 return -ENOENT;
 200
 201         if ((r = unit_name_to_instance(s, &i)) < 0)
 202                 return r;
 203
 204         u->meta.id = s;
 205
 206         free(u->meta.instance);
 207         u->meta.instance = i;
 208
 209         unit_add_to_dbus_queue(u);
 210
 211         return 0;
 212 }
 213
 214 int unit_set_description(Unit *u, const char *description) {
 215         char *s;
 216
 217         assert(u);
 218
 219         if (!(s = strdup(description)))
 220                 return -ENOMEM;
 221
 222         free(u->meta.description);
 223         u->meta.description = s;
 224
 225         unit_add_to_dbus_queue(u);
 226         return 0;
 227 }
 228
 229 bool unit_check_gc(Unit *u) {
 230         assert(u);
 231
 232         if (u->meta.load_state == UNIT_STUB)
 233                 return true;
 234
 235         if (UNIT_VTABLE(u)->no_gc)
 236                 return true;
 237
 238         if (u->meta.job)
 239                 return true;
 240
 241         if (unit_active_state(u) != UNIT_INACTIVE)
 242                 return true;
 243
 244         if (UNIT_VTABLE(u)->check_gc)
 245                 if (UNIT_VTABLE(u)->check_gc(u))
 246                         return true;
 247
 248         return false;
 249 }
 250
 251 void unit_add_to_load_queue(Unit *u) {
 252         assert(u);
 253         assert(u->meta.type != _UNIT_TYPE_INVALID);
 254
 255         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 256                 return;
 257
 258         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 259         u->meta.in_load_queue = true;
 260 }
 261
 262 void unit_add_to_cleanup_queue(Unit *u) {
 263         assert(u);
 264
 265         if (u->meta.in_cleanup_queue)
 266                 return;
 267
 268         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 269         u->meta.in_cleanup_queue = true;
 270 }
 271
 272 void unit_add_to_gc_queue(Unit *u) {
 273         assert(u);
 274
 275         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 276                 return;
 277
 278         if (unit_check_gc(u))
 279                 return;
 280
 281         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 282         u->meta.in_gc_queue = true;
 283
 284         u->meta.manager->n_in_gc_queue ++;
 285
 286         if (u->meta.manager->gc_queue_timestamp <= 0)
 287                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 288 }
 289
 290 void unit_add_to_dbus_queue(Unit *u) {
 291         assert(u);
 292         assert(u->meta.type != _UNIT_TYPE_INVALID);
 293
 294         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 295                 return;
 296
 297         /* Shortcut things if nobody cares */
 298         if (!bus_has_subscriber(u->meta.manager)) {
 299                 u->meta.sent_dbus_new_signal = true;
 300                 return;
 301         }
 302
 303         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 304         u->meta.in_dbus_queue = true;
 305 }
 306
 307 static void bidi_set_free(Unit *u, Set *s) {
 308         Iterator i;
 309         Unit *other;
 310
 311         assert(u);
 312
 313         /* Frees the set and makes sure we are dropped from the
 314          * inverse pointers */
 315
 316         SET_FOREACH(other, s, i) {
 317                 UnitDependency d;
 318
 319                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 320                         set_remove(other->meta.dependencies[d], u);
 321
 322                 unit_add_to_gc_queue(other);
 323         }
 324
 325         set_free(s);
 326 }
 327
 328 void unit_free(Unit *u) {
 329         UnitDependency d;
 330         Iterator i;
 331         char *t;
 332
 333         assert(u);
 334
 335         bus_unit_send_removed_signal(u);
 336
 337         if (u->meta.load_state != UNIT_STUB)
 338                 if (UNIT_VTABLE(u)->done)
 339                         UNIT_VTABLE(u)->done(u);
 340
 341         SET_FOREACH(t, u->meta.names, i)
 342                 hashmap_remove_value(u->meta.manager->units, t, u);
 343
 344         if (u->meta.job)
 345                 job_free(u->meta.job);
 346
 347         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 348                 bidi_set_free(u, u->meta.dependencies[d]);
 349
 350         if (u->meta.type != _UNIT_TYPE_INVALID)
 351                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 352
 353         if (u->meta.in_load_queue)
 354                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 355
 356         if (u->meta.in_dbus_queue)
 357                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 358
 359         if (u->meta.in_cleanup_queue)
 360                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 361
 362         if (u->meta.in_gc_queue) {
 363                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 364                 u->meta.manager->n_in_gc_queue--;
 365         }
 366
 367         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 368
 369         free(u->meta.description);
 370         free(u->meta.fragment_path);
 371
 372         set_free_free(u->meta.names);
 373
 374         free(u->meta.instance);
 375
 376         free(u);
 377 }
 378
 379 UnitActiveState unit_active_state(Unit *u) {
 380         assert(u);
 381
 382         if (u->meta.load_state == UNIT_MERGED)
 383                 return unit_active_state(unit_follow_merge(u));
 384
 385         /* After a reload it might happen that a unit is not correctly
 386          * loaded but still has a process around. That's why we won't
 387          * shortcut failed loading to UNIT_INACTIVE_MAINTENANCE. */
 388
 389         return UNIT_VTABLE(u)->active_state(u);
 390 }
 391
 392 const char* unit_sub_state_to_string(Unit *u) {
 393         assert(u);
 394
 395         return UNIT_VTABLE(u)->sub_state_to_string(u);
 396 }
 397
 398 static void complete_move(Set **s, Set **other) {
 399         assert(s);
 400         assert(other);
 401
 402         if (!*other)
 403                 return;
 404
 405         if (*s)
 406                 set_move(*s, *other);
 407         else {
 408                 *s = *other;
 409                 *other = NULL;
 410         }
 411 }
 412
 413 static void merge_names(Unit *u, Unit *other) {
 414         char *t;
 415         Iterator i;
 416
 417         assert(u);
 418         assert(other);
 419
 420         complete_move(&u->meta.names, &other->meta.names);
 421
 422         set_free_free(other->meta.names);
 423         other->meta.names = NULL;
 424         other->meta.id = NULL;
 425
 426         SET_FOREACH(t, u->meta.names, i)
 427                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 428 }
 429
 430 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 431         Iterator i;
 432         Unit *back;
 433         int r;
 434
 435         assert(u);
 436         assert(other);
 437         assert(d < _UNIT_DEPENDENCY_MAX);
 438
 439         SET_FOREACH(back, other->meta.dependencies[d], i) {
 440                 UnitDependency k;
 441
 442                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 443                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 444
 445                                 if (r == -EEXIST)
 446                                         set_remove(back->meta.dependencies[k], other);
 447                                 else
 448                                         assert(r == -ENOENT);
 449                         }
 450         }
 451
 452         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 453
 454         set_free(other->meta.dependencies[d]);
 455         other->meta.dependencies[d] = NULL;
 456 }
 457
 458 int unit_merge(Unit *u, Unit *other) {
 459         UnitDependency d;
 460
 461         assert(u);
 462         assert(other);
 463         assert(u->meta.manager == other->meta.manager);
 464         assert(u->meta.type != _UNIT_TYPE_INVALID);
 465
 466         other = unit_follow_merge(other);
 467
 468         if (other == u)
 469                 return 0;
 470
 471         if (u->meta.type != other->meta.type)
 472                 return -EINVAL;
 473
 474         if (!u->meta.instance != !other->meta.instance)
 475                 return -EINVAL;
 476
 477         if (other->meta.load_state != UNIT_STUB &&
 478             other->meta.load_state != UNIT_FAILED)
 479                 return -EEXIST;
 480
 481         if (other->meta.job)
 482                 return -EEXIST;
 483
 484         if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(other)))
 485                 return -EEXIST;
 486
 487         /* Merge names */
 488         merge_names(u, other);
 489
 490         /* Merge dependencies */
 491         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 492                 merge_dependencies(u, other, d);
 493
 494         other->meta.load_state = UNIT_MERGED;
 495         other->meta.merged_into = u;
 496
 497         /* If there is still some data attached to the other node, we
 498          * don't need it anymore, and can free it. */
 499         if (other->meta.load_state != UNIT_STUB)
 500                 if (UNIT_VTABLE(other)->done)
 501                         UNIT_VTABLE(other)->done(other);
 502
 503         unit_add_to_dbus_queue(u);
 504         unit_add_to_cleanup_queue(other);
 505
 506         return 0;
 507 }
 508
 509 int unit_merge_by_name(Unit *u, const char *name) {
 510         Unit *other;
 511         int r;
 512         char *s = NULL;
 513
 514         assert(u);
 515         assert(name);
 516
 517         if (unit_name_is_template(name)) {
 518                 if (!u->meta.instance)
 519                         return -EINVAL;
 520
 521                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 522                         return -ENOMEM;
 523
 524                 name = s;
 525         }
 526
 527         if (!(other = manager_get_unit(u->meta.manager, name)))
 528                 r = unit_add_name(u, name);
 529         else
 530                 r = unit_merge(u, other);
 531
 532         free(s);
 533         return r;
 534 }
 535
 536 Unit* unit_follow_merge(Unit *u) {
 537         assert(u);
 538
 539         while (u->meta.load_state == UNIT_MERGED)
 540                 assert_se(u = u->meta.merged_into);
 541
 542         return u;
 543 }
 544
 545 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 546         int r;
 547
 548         assert(u);
 549         assert(c);
 550
 551         if (c->std_output != EXEC_OUTPUT_KMSG &&
 552             c->std_output != EXEC_OUTPUT_SYSLOG &&
 553             c->std_error != EXEC_OUTPUT_KMSG &&
 554             c->std_error != EXEC_OUTPUT_SYSLOG)
 555                 return 0;
 556
 557         /* If syslog or kernel logging is requested, make sure our own
 558          * logging daemon is run first. */
 559
 560         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 561                 return r;
 562
 563         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 564                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 565                         return r;
 566
 567         return 0;
 568 }
 569
 570 const char *unit_description(Unit *u) {
 571         assert(u);
 572
 573         if (u->meta.description)
 574                 return u->meta.description;
 575
 576         return u->meta.id;
 577 }
 578
 579 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 580         char *t;
 581         UnitDependency d;
 582         Iterator i;
 583         char *p2;
 584         const char *prefix2;
 585         CGroupBonding *b;
 586         char
 587                 timestamp1[FORMAT_TIMESTAMP_MAX],
 588                 timestamp2[FORMAT_TIMESTAMP_MAX],
 589                 timestamp3[FORMAT_TIMESTAMP_MAX],
 590                 timestamp4[FORMAT_TIMESTAMP_MAX],
 591                 timespan[FORMAT_TIMESPAN_MAX];
 592         Unit *following;
 593
 594         assert(u);
 595         assert(u->meta.type >= 0);
 596
 597         if (!prefix)
 598                 prefix = "";
 599         p2 = strappend(prefix, "\t");
 600         prefix2 = p2 ? p2 : prefix;
 601
 602         fprintf(f,
 603                 "%s-> Unit %s:\n"
 604                 "%s\tDescription: %s\n"
 605                 "%s\tInstance: %s\n"
 606                 "%s\tUnit Load State: %s\n"
 607                 "%s\tUnit Active State: %s\n"
 608                 "%s\tInactive Exit Timestamp: %s\n"
 609                 "%s\tActive Enter Timestamp: %s\n"
 610                 "%s\tActive Exit Timestamp: %s\n"
 611                 "%s\tInactive Enter Timestamp: %s\n"
 612                 "%s\tGC Check Good: %s\n"
 613                 "%s\tNeed Daemon Reload: %s\n",
 614                 prefix, u->meta.id,
 615                 prefix, unit_description(u),
 616                 prefix, strna(u->meta.instance),
 617                 prefix, unit_load_state_to_string(u->meta.load_state),
 618                 prefix, unit_active_state_to_string(unit_active_state(u)),
 619                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 620                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 621                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 622                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 623                 prefix, yes_no(unit_check_gc(u)),
 624                 prefix, yes_no(unit_need_daemon_reload(u)));
 625
 626         SET_FOREACH(t, u->meta.names, i)
 627                 fprintf(f, "%s\tName: %s\n", prefix, t);
 628
 629         if ((following = unit_following(u)))
 630                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 631
 632         if (u->meta.fragment_path)
 633                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 634
 635         if (u->meta.job_timeout > 0)
 636                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 637
 638         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 639                 Unit *other;
 640
 641                 SET_FOREACH(other, u->meta.dependencies[d], i)
 642                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 643         }
 644
 645         if (u->meta.load_state == UNIT_LOADED) {
 646                 fprintf(f,
 647                         "%s\tRecursive Stop: %s\n"
 648                         "%s\tStopWhenUnneeded: %s\n"
 649                         "%s\tOnlyByDependency: %s\n"
 650                         "%s\tDefaultDependencies: %s\n"
 651                         "%s\tIgnoreDependencyFailure: %s\n",
 652                         prefix, yes_no(u->meta.recursive_stop),
 653                         prefix, yes_no(u->meta.stop_when_unneeded),
 654                         prefix, yes_no(u->meta.only_by_dependency),
 655                         prefix, yes_no(u->meta.default_dependencies),
 656                         prefix, yes_no(u->meta.ignore_dependency_failure));
 657
 658                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 659                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 660                                 prefix, b->controller, b->path);
 661
 662                 if (UNIT_VTABLE(u)->dump)
 663                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 664
 665         } else if (u->meta.load_state == UNIT_MERGED)
 666                 fprintf(f,
 667                         "%s\tMerged into: %s\n",
 668                         prefix, u->meta.merged_into->meta.id);
 669
 670         if (u->meta.job)
 671                 job_dump(u->meta.job, f, prefix2);
 672
 673         free(p2);
 674 }
 675
 676 /* Common implementation for multiple backends */
 677 int unit_load_fragment_and_dropin(Unit *u) {
 678         int r;
 679
 680         assert(u);
 681
 682         /* Load a .service file */
 683         if ((r = unit_load_fragment(u)) < 0)
 684                 return r;
 685
 686         if (u->meta.load_state == UNIT_STUB)
 687                 return -ENOENT;
 688
 689         /* Load drop-in directory data */
 690         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 691                 return r;
 692
 693         return 0;
 694 }
 695
 696 /* Common implementation for multiple backends */
 697 int unit_load_fragment_and_dropin_optional(Unit *u) {
 698         int r;
 699
 700         assert(u);
 701
 702         /* Same as unit_load_fragment_and_dropin(), but whether
 703          * something can be loaded or not doesn't matter. */
 704
 705         /* Load a .service file */
 706         if ((r = unit_load_fragment(u)) < 0)
 707                 return r;
 708
 709         if (u->meta.load_state == UNIT_STUB)
 710                 u->meta.load_state = UNIT_LOADED;
 711
 712         /* Load drop-in directory data */
 713         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 714                 return r;
 715
 716         return 0;
 717 }
 718
 719 /* Common implementation for multiple backends */
 720 int unit_load_nop(Unit *u) {
 721         assert(u);
 722
 723         if (u->meta.load_state == UNIT_STUB)
 724                 u->meta.load_state = UNIT_LOADED;
 725
 726         return 0;
 727 }
 728
 729 int unit_load(Unit *u) {
 730         int r;
 731
 732         assert(u);
 733
 734         if (u->meta.in_load_queue) {
 735                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 736                 u->meta.in_load_queue = false;
 737         }
 738
 739         if (u->meta.type == _UNIT_TYPE_INVALID)
 740                 return -EINVAL;
 741
 742         if (u->meta.load_state != UNIT_STUB)
 743                 return 0;
 744
 745         if (UNIT_VTABLE(u)->load)
 746                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 747                         goto fail;
 748
 749         if (u->meta.load_state == UNIT_STUB) {
 750                 r = -ENOENT;
 751                 goto fail;
 752         }
 753
 754         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 755
 756         unit_add_to_dbus_queue(unit_follow_merge(u));
 757         unit_add_to_gc_queue(u);
 758
 759         return 0;
 760
 761 fail:
 762         u->meta.load_state = UNIT_FAILED;
 763         unit_add_to_dbus_queue(u);
 764
 765         log_notice("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 766
 767         return r;
 768 }
 769
 770 /* Errors:
 771  *         -EBADR:     This unit type does not support starting.
 772  *         -EALREADY:  Unit is already started.
 773  *         -EAGAIN:    An operation is already in progress. Retry later.
 774  *         -ECANCELED: Too many requests for now.
 775  */
 776 int unit_start(Unit *u) {
 777         UnitActiveState state;
 778
 779         assert(u);
 780
 781         if (u->meta.load_state != UNIT_LOADED)
 782                 return -EINVAL;
 783
 784         /* If this is already (being) started, then this will
 785          * succeed. Note that this will even succeed if this unit is
 786          * not startable by the user. This is relied on to detect when
 787          * we need to wait for units and when waiting is finished. */
 788         state = unit_active_state(u);
 789         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 790                 return -EALREADY;
 791
 792         /* If it is stopped, but we cannot start it, then fail */
 793         if (!UNIT_VTABLE(u)->start)
 794                 return -EBADR;
 795
 796         /* We don't suppress calls to ->start() here when we are
 797          * already starting, to allow this request to be used as a
 798          * "hurry up" call, for example when the unit is in some "auto
 799          * restart" state where it waits for a holdoff timer to elapse
 800          * before it will start again. */
 801
 802         unit_add_to_dbus_queue(u);
 803
 804         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 805
 806         return UNIT_VTABLE(u)->start(u);
 807 }
 808
 809 bool unit_can_start(Unit *u) {
 810         assert(u);
 811
 812         return !!UNIT_VTABLE(u)->start;
 813 }
 814
 815 /* Errors:
 816  *         -EBADR:    This unit type does not support stopping.
 817  *         -EALREADY: Unit is already stopped.
 818  *         -EAGAIN:   An operation is already in progress. Retry later.
 819  */
 820 int unit_stop(Unit *u) {
 821         UnitActiveState state;
 822
 823         assert(u);
 824
 825         state = unit_active_state(u);
 826         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
 827                 return -EALREADY;
 828
 829         if (!UNIT_VTABLE(u)->stop)
 830                 return -EBADR;
 831
 832         unit_add_to_dbus_queue(u);
 833
 834         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 835
 836         return UNIT_VTABLE(u)->stop(u);
 837 }
 838
 839 /* Errors:
 840  *         -EBADR:    This unit type does not support reloading.
 841  *         -ENOEXEC:  Unit is not started.
 842  *         -EAGAIN:   An operation is already in progress. Retry later.
 843  */
 844 int unit_reload(Unit *u) {
 845         UnitActiveState state;
 846
 847         assert(u);
 848
 849         if (u->meta.load_state != UNIT_LOADED)
 850                 return -EINVAL;
 851
 852         if (!unit_can_reload(u))
 853                 return -EBADR;
 854
 855         state = unit_active_state(u);
 856         if (unit_active_state(u) == UNIT_RELOADING)
 857                 return -EALREADY;
 858
 859         if (unit_active_state(u) != UNIT_ACTIVE)
 860                 return -ENOEXEC;
 861
 862         unit_add_to_dbus_queue(u);
 863         return UNIT_VTABLE(u)->reload(u);
 864 }
 865
 866 bool unit_can_reload(Unit *u) {
 867         assert(u);
 868
 869         if (!UNIT_VTABLE(u)->reload)
 870                 return false;
 871
 872         if (!UNIT_VTABLE(u)->can_reload)
 873                 return true;
 874
 875         return UNIT_VTABLE(u)->can_reload(u);
 876 }
 877
 878 static void unit_check_uneeded(Unit *u) {
 879         Iterator i;
 880         Unit *other;
 881
 882         assert(u);
 883
 884         /* If this service shall be shut down when unneeded then do
 885          * so. */
 886
 887         if (!u->meta.stop_when_unneeded)
 888                 return;
 889
 890         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 891                 return;
 892
 893         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 894                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 895                         return;
 896
 897         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 898                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 899                         return;
 900
 901         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 902                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 903                         return;
 904
 905         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 906
 907         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 908         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 909 }
 910
 911 static void retroactively_start_dependencies(Unit *u) {
 912         Iterator i;
 913         Unit *other;
 914
 915         assert(u);
 916         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 917
 918         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 919                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 920                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 921
 922         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 923                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 924                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 925
 926         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 927                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 928                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 929
 930         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 931                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 932                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 933
 934         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 935                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 936                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 937 }
 938
 939 static void retroactively_stop_dependencies(Unit *u) {
 940         Iterator i;
 941         Unit *other;
 942
 943         assert(u);
 944         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 945
 946         if (u->meta.recursive_stop) {
 947                 /* Pull down units need us recursively if enabled */
 948                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 949                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 950                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 951         }
 952
 953         /* Garbage collect services that might not be needed anymore, if enabled */
 954         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 955                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 956                         unit_check_uneeded(other);
 957         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 958                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 959                         unit_check_uneeded(other);
 960         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 961                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 962                         unit_check_uneeded(other);
 963         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 964                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 965                         unit_check_uneeded(other);
 966         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
 967                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 968                         unit_check_uneeded(other);
 969 }
 970
 971 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 972         dual_timestamp ts;
 973         bool unexpected;
 974
 975         assert(u);
 976         assert(os < _UNIT_ACTIVE_STATE_MAX);
 977         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 978
 979         /* Note that this is called for all low-level state changes,
 980          * even if they might map to the same high-level
 981          * UnitActiveState! That means that ns == os is OK an expected
 982          * behaviour here. For example: if a mount point is remounted
 983          * this function will be called too and the utmp code below
 984          * relies on that! */
 985
 986         dual_timestamp_get(&ts);
 987
 988         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 989                 u->meta.inactive_exit_timestamp = ts;
 990         else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 991                 u->meta.inactive_enter_timestamp = ts;
 992
 993         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 994                 u->meta.active_enter_timestamp = ts;
 995         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 996                 u->meta.active_exit_timestamp = ts;
 997
 998         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 999                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1000
1001         timer_unit_notify(u, ns);
1002         path_unit_notify(u, ns);
1003
1004         if (u->meta.job) {
1005                 unexpected = false;
1006
1007                 if (u->meta.job->state == JOB_WAITING)
1008
1009                         /* So we reached a different state for this
1010                          * job. Let's see if we can run it now if it
1011                          * failed previously due to EAGAIN. */
1012                         job_add_to_run_queue(u->meta.job);
1013
1014                 /* Let's check whether this state change constitutes a
1015                  * finished job, or maybe cotradicts a running job and
1016                  * hence needs to invalidate jobs. */
1017
1018                 switch (u->meta.job->type) {
1019
1020                 case JOB_START:
1021                 case JOB_VERIFY_ACTIVE:
1022
1023                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1024                                 job_finish_and_invalidate(u->meta.job, true);
1025                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1026                                 unexpected = true;
1027                                 job_finish_and_invalidate(u->meta.job, false);
1028                         }
1029
1030                         break;
1031
1032                 case JOB_RELOAD:
1033                 case JOB_RELOAD_OR_START:
1034
1035                         if (u->meta.job->state == JOB_RUNNING) {
1036                                 if (ns == UNIT_ACTIVE)
1037                                         job_finish_and_invalidate(u->meta.job, true);
1038                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1039                                         unexpected = true;
1040                                         job_finish_and_invalidate(u->meta.job, false);
1041                                 }
1042                         }
1043
1044                         break;
1045
1046                 case JOB_STOP:
1047                 case JOB_RESTART:
1048                 case JOB_TRY_RESTART:
1049
1050                         if (ns == UNIT_INACTIVE || ns == UNIT_MAINTENANCE)
1051                                 job_finish_and_invalidate(u->meta.job, true);
1052                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1053                                 unexpected = true;
1054                                 job_finish_and_invalidate(u->meta.job, false);
1055                         }
1056
1057                         break;
1058
1059                 default:
1060                         assert_not_reached("Job type unknown");
1061                 }
1062
1063         } else
1064                 unexpected = true;
1065
1066         /* If this state change happened without being requested by a
1067          * job, then let's retroactively start or stop
1068          * dependencies. We skip that step when deserializing, since
1069          * we don't want to create any additional jobs just because
1070          * something is already activated. */
1071
1072         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1073                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1074                         retroactively_start_dependencies(u);
1075                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1076                         retroactively_stop_dependencies(u);
1077         }
1078
1079         if (ns != os && ns == UNIT_MAINTENANCE) {
1080                 Iterator i;
1081                 Unit *other;
1082
1083                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1084                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1085
1086                 log_notice("Unit %s entered maintenance state.", u->meta.id);
1087         }
1088
1089         /* Some names are special */
1090         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1091                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1092                         /* The bus just might have become available,
1093                          * hence try to connect to it, if we aren't
1094                          * yet connected. */
1095                         bus_init(u->meta.manager);
1096                 }
1097
1098                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1099                         /* The syslog daemon just might have become
1100                          * available, hence try to connect to it, if
1101                          * we aren't yet connected. */
1102                         log_open();
1103
1104                 if (u->meta.type == UNIT_MOUNT)
1105                         /* Another directory became available, let's
1106                          * check if that is enough to write our utmp
1107                          * entry. */
1108                         manager_write_utmp_reboot(u->meta.manager);
1109
1110                 if (u->meta.type == UNIT_TARGET)
1111                         /* A target got activated, maybe this is a runlevel? */
1112                         manager_write_utmp_runlevel(u->meta.manager, u);
1113
1114         } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1115
1116                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1117                         /* The syslog daemon might just have
1118                          * terminated, hence try to disconnect from
1119                          * it. */
1120                         log_close_syslog();
1121
1122                 /* We don't care about D-Bus here, since we'll get an
1123                  * asynchronous notification for it anyway. */
1124         }
1125
1126         /* Maybe we finished startup and are now ready for being
1127          * stopped because unneeded? */
1128         unit_check_uneeded(u);
1129
1130         unit_add_to_dbus_queue(u);
1131         unit_add_to_gc_queue(u);
1132 }
1133
1134 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1135         struct epoll_event ev;
1136
1137         assert(u);
1138         assert(fd >= 0);
1139         assert(w);
1140         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1141
1142         zero(ev);
1143         ev.data.ptr = w;
1144         ev.events = events;
1145
1146         if (epoll_ctl(u->meta.manager->epoll_fd,
1147                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1148                       fd,
1149                       &ev) < 0)
1150                 return -errno;
1151
1152         w->fd = fd;
1153         w->type = WATCH_FD;
1154         w->data.unit = u;
1155
1156         return 0;
1157 }
1158
1159 void unit_unwatch_fd(Unit *u, Watch *w) {
1160         assert(u);
1161         assert(w);
1162
1163         if (w->type == WATCH_INVALID)
1164                 return;
1165
1166         assert(w->type == WATCH_FD);
1167         assert(w->data.unit == u);
1168         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1169
1170         w->fd = -1;
1171         w->type = WATCH_INVALID;
1172         w->data.unit = NULL;
1173 }
1174
1175 int unit_watch_pid(Unit *u, pid_t pid) {
1176         assert(u);
1177         assert(pid >= 1);
1178
1179         /* Watch a specific PID. We only support one unit watching
1180          * each PID for now. */
1181
1182         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1183 }
1184
1185 void unit_unwatch_pid(Unit *u, pid_t pid) {
1186         assert(u);
1187         assert(pid >= 1);
1188
1189         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1190 }
1191
1192 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1193         struct itimerspec its;
1194         int flags, fd;
1195         bool ours;
1196
1197         assert(u);
1198         assert(w);
1199         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1200
1201         /* This will try to reuse the old timer if there is one */
1202
1203         if (w->type == WATCH_UNIT_TIMER) {
1204                 assert(w->data.unit == u);
1205                 assert(w->fd >= 0);
1206
1207                 ours = false;
1208                 fd = w->fd;
1209         } else if (w->type == WATCH_INVALID) {
1210
1211                 ours = true;
1212                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1213                         return -errno;
1214         } else
1215                 assert_not_reached("Invalid watch type");
1216
1217         zero(its);
1218
1219         if (delay <= 0) {
1220                 /* Set absolute time in the past, but not 0, since we
1221                  * don't want to disarm the timer */
1222                 its.it_value.tv_sec = 0;
1223                 its.it_value.tv_nsec = 1;
1224
1225                 flags = TFD_TIMER_ABSTIME;
1226         } else {
1227                 timespec_store(&its.it_value, delay);
1228                 flags = 0;
1229         }
1230
1231         /* This will also flush the elapse counter */
1232         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1233                 goto fail;
1234
1235         if (w->type == WATCH_INVALID) {
1236                 struct epoll_event ev;
1237
1238                 zero(ev);
1239                 ev.data.ptr = w;
1240                 ev.events = EPOLLIN;
1241
1242                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1243                         goto fail;
1244         }
1245
1246         w->type = WATCH_UNIT_TIMER;
1247         w->fd = fd;
1248         w->data.unit = u;
1249
1250         return 0;
1251
1252 fail:
1253         if (ours)
1254                 close_nointr_nofail(fd);
1255
1256         return -errno;
1257 }
1258
1259 void unit_unwatch_timer(Unit *u, Watch *w) {
1260         assert(u);
1261         assert(w);
1262
1263         if (w->type == WATCH_INVALID)
1264                 return;
1265
1266         assert(w->type == WATCH_UNIT_TIMER);
1267         assert(w->data.unit == u);
1268         assert(w->fd >= 0);
1269
1270         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1271         close_nointr_nofail(w->fd);
1272
1273         w->fd = -1;
1274         w->type = WATCH_INVALID;
1275         w->data.unit = NULL;
1276 }
1277
1278 bool unit_job_is_applicable(Unit *u, JobType j) {
1279         assert(u);
1280         assert(j >= 0 && j < _JOB_TYPE_MAX);
1281
1282         switch (j) {
1283
1284         case JOB_VERIFY_ACTIVE:
1285         case JOB_START:
1286                 return true;
1287
1288         case JOB_STOP:
1289         case JOB_RESTART:
1290         case JOB_TRY_RESTART:
1291                 return unit_can_start(u);
1292
1293         case JOB_RELOAD:
1294                 return unit_can_reload(u);
1295
1296         case JOB_RELOAD_OR_START:
1297                 return unit_can_reload(u) && unit_can_start(u);
1298
1299         default:
1300                 assert_not_reached("Invalid job type");
1301         }
1302 }
1303
1304 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1305
1306         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1307                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1308                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1309                 [UNIT_WANTS] = UNIT_WANTED_BY,
1310                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1311                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1312                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1313                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1314                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1315                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1316                 [UNIT_BEFORE] = UNIT_AFTER,
1317                 [UNIT_AFTER] = UNIT_BEFORE,
1318                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1319                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1320                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1321         };
1322         int r, q = 0, v = 0, w = 0;
1323
1324         assert(u);
1325         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1326         assert(other);
1327
1328         /* We won't allow dependencies on ourselves. We will not
1329          * consider them an error however. */
1330         if (u == other)
1331                 return 0;
1332
1333         if (UNIT_VTABLE(u)->no_requires &&
1334             (d == UNIT_REQUIRES ||
1335              d == UNIT_REQUIRES_OVERRIDABLE ||
1336              d == UNIT_REQUISITE ||
1337              d == UNIT_REQUISITE_OVERRIDABLE)) {
1338                     return -EINVAL;
1339         }
1340
1341         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1342                 return r;
1343
1344         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1345                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1346                         return r;
1347
1348         if (add_reference)
1349                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1350                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1351                         return r;
1352
1353         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1354                 return q;
1355
1356         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1357                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1358                         r = v;
1359                         goto fail;
1360                 }
1361
1362         if (add_reference) {
1363                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1364                         r = w;
1365                         goto fail;
1366                 }
1367
1368                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1369                         goto fail;
1370         }
1371
1372         unit_add_to_dbus_queue(u);
1373         return 0;
1374
1375 fail:
1376         if (q > 0)
1377                 set_remove(u->meta.dependencies[d], other);
1378
1379         if (v > 0)
1380                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1381
1382         if (w > 0)
1383                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1384
1385         return r;
1386 }
1387
1388 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1389         int r;
1390
1391         assert(u);
1392
1393         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1394                 return r;
1395
1396         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1397                 return r;
1398
1399         return 0;
1400 }
1401
1402 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1403         char *s;
1404
1405         assert(u);
1406         assert(name || path);
1407
1408         if (!name)
1409                 name = file_name_from_path(path);
1410
1411         if (!unit_name_is_template(name)) {
1412                 *p = NULL;
1413                 return name;
1414         }
1415
1416         if (u->meta.instance)
1417                 s = unit_name_replace_instance(name, u->meta.instance);
1418         else {
1419                 char *i;
1420
1421                 if (!(i = unit_name_to_prefix(u->meta.id)))
1422                         return NULL;
1423
1424                 s = unit_name_replace_instance(name, i);
1425                 free(i);
1426         }
1427
1428         if (!s)
1429                 return NULL;
1430
1431         *p = s;
1432         return s;
1433 }
1434
1435 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1436         Unit *other;
1437         int r;
1438         char *s;
1439
1440         assert(u);
1441         assert(name || path);
1442
1443         if (!(name = resolve_template(u, name, path, &s)))
1444                 return -ENOMEM;
1445
1446         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1447                 goto finish;
1448
1449         r = unit_add_dependency(u, d, other, add_reference);
1450
1451 finish:
1452         free(s);
1453         return r;
1454 }
1455
1456 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1457         Unit *other;
1458         int r;
1459         char *s;
1460
1461         assert(u);
1462         assert(name || path);
1463
1464         if (!(name = resolve_template(u, name, path, &s)))
1465                 return -ENOMEM;
1466
1467         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1468                 goto finish;
1469
1470         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1471
1472 finish:
1473         free(s);
1474         return r;
1475 }
1476
1477 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1478         Unit *other;
1479         int r;
1480         char *s;
1481
1482         assert(u);
1483         assert(name || path);
1484
1485         if (!(name = resolve_template(u, name, path, &s)))
1486                 return -ENOMEM;
1487
1488         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1489                 goto finish;
1490
1491         r = unit_add_dependency(other, d, u, add_reference);
1492
1493 finish:
1494         free(s);
1495         return r;
1496 }
1497
1498 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1499         Unit *other;
1500         int r;
1501         char *s;
1502
1503         assert(u);
1504         assert(name || path);
1505
1506         if (!(name = resolve_template(u, name, path, &s)))
1507                 return -ENOMEM;
1508
1509         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1510                 goto finish;
1511
1512         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1513                 goto finish;
1514
1515 finish:
1516         free(s);
1517         return r;
1518 }
1519
1520 int set_unit_path(const char *p) {
1521         char *cwd, *c;
1522         int r;
1523
1524         /* This is mostly for debug purposes */
1525
1526         if (path_is_absolute(p)) {
1527                 if (!(c = strdup(p)))
1528                         return -ENOMEM;
1529         } else {
1530                 if (!(cwd = get_current_dir_name()))
1531                         return -errno;
1532
1533                 r = asprintf(&c, "%s/%s", cwd, p);
1534                 free(cwd);
1535
1536                 if (r < 0)
1537                         return -ENOMEM;
1538         }
1539
1540         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1541                 r = -errno;
1542                 free(c);
1543                 return r;
1544         }
1545
1546         return 0;
1547 }
1548
1549 char *unit_dbus_path(Unit *u) {
1550         char *p, *e;
1551
1552         assert(u);
1553
1554         if (!(e = bus_path_escape(u->meta.id)))
1555                 return NULL;
1556
1557         p = strappend("/org/freedesktop/systemd1/unit/", e);
1558         free(e);
1559
1560         return p;
1561 }
1562
1563 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1564         CGroupBonding *l;
1565         int r;
1566
1567         assert(u);
1568         assert(b);
1569
1570         assert(b->path);
1571
1572         if (!b->controller)
1573                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1574                         return -ENOMEM;
1575
1576         /* Ensure this hasn't been added yet */
1577         assert(!b->unit);
1578
1579         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1580         LIST_PREPEND(CGroupBonding, by_path, l, b);
1581
1582         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1583                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1584                 return r;
1585         }
1586
1587         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1588         b->unit = u;
1589
1590         return 0;
1591 }
1592
1593 static char *default_cgroup_path(Unit *u) {
1594         char *p;
1595         int r;
1596
1597         assert(u);
1598
1599         if (u->meta.instance) {
1600                 char *t;
1601
1602                 if (!(t = unit_name_template(u->meta.id)))
1603                         return NULL;
1604
1605                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1606                 free(t);
1607         } else
1608                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1609
1610         return r < 0 ? NULL : p;
1611 }
1612
1613 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1614         char *controller = NULL, *path = NULL;
1615         CGroupBonding *b = NULL;
1616         int r;
1617
1618         assert(u);
1619         assert(name);
1620
1621         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1622                 return r;
1623
1624         if (!path)
1625                 path = default_cgroup_path(u);
1626
1627         if (!controller)
1628                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1629
1630         if (!path || !controller) {
1631                 free(path);
1632                 free(controller);
1633
1634                 return -ENOMEM;
1635         }
1636
1637         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1638                 r = -EEXIST;
1639                 goto fail;
1640         }
1641
1642         if (!(b = new0(CGroupBonding, 1))) {
1643                 r = -ENOMEM;
1644                 goto fail;
1645         }
1646
1647         b->controller = controller;
1648         b->path = path;
1649         b->only_us = false;
1650         b->clean_up = false;
1651
1652         if ((r = unit_add_cgroup(u, b)) < 0)
1653                 goto fail;
1654
1655         return 0;
1656
1657 fail:
1658         free(path);
1659         free(controller);
1660         free(b);
1661
1662         return r;
1663 }
1664
1665 int unit_add_default_cgroup(Unit *u) {
1666         CGroupBonding *b;
1667         int r = -ENOMEM;
1668
1669         assert(u);
1670
1671         /* Adds in the default cgroup data, if it wasn't specified yet */
1672
1673         if (unit_get_default_cgroup(u))
1674                 return 0;
1675
1676         if (!(b = new0(CGroupBonding, 1)))
1677                 return -ENOMEM;
1678
1679         if (!(b->path = default_cgroup_path(u)))
1680                 goto fail;
1681
1682         b->clean_up = true;
1683         b->only_us = true;
1684
1685         if ((r = unit_add_cgroup(u, b)) < 0)
1686                 goto fail;
1687
1688         return 0;
1689
1690 fail:
1691         free(b->path);
1692         free(b->controller);
1693         free(b);
1694
1695         return r;
1696 }
1697
1698 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1699         assert(u);
1700
1701         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1702 }
1703
1704 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1705         char *t;
1706         int r;
1707
1708         assert(u);
1709         assert(type);
1710         assert(_found);
1711
1712         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1713                 return -ENOMEM;
1714
1715         assert(!unit_has_name(u, t));
1716
1717         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1718         free(t);
1719
1720         assert(r < 0 || *_found != u);
1721
1722         return r;
1723 }
1724
1725 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1726         Unit *found;
1727         char *t;
1728
1729         assert(u);
1730         assert(type);
1731         assert(_found);
1732
1733         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1734                 return -ENOMEM;
1735
1736         assert(!unit_has_name(u, t));
1737
1738         found = manager_get_unit(u->meta.manager, t);
1739         free(t);
1740
1741         if (!found)
1742                 return -ENOENT;
1743
1744         *_found = found;
1745         return 0;
1746 }
1747
1748 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1749         Unit *u = userdata;
1750         assert(u);
1751
1752         return unit_name_to_prefix_and_instance(u->meta.id);
1753 }
1754
1755 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1756         Unit *u = userdata;
1757         assert(u);
1758
1759         return unit_name_to_prefix(u->meta.id);
1760 }
1761
1762 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1763         Unit *u = userdata;
1764         char *p, *r;
1765
1766         assert(u);
1767
1768         if (!(p = unit_name_to_prefix(u->meta.id)))
1769                 return NULL;
1770
1771         r = unit_name_unescape(p);
1772         free(p);
1773
1774         return r;
1775 }
1776
1777 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1778         Unit *u = userdata;
1779         assert(u);
1780
1781         if (u->meta.instance)
1782                 return unit_name_unescape(u->meta.instance);
1783
1784         return strdup("");
1785 }
1786
1787 char *unit_name_printf(Unit *u, const char* format) {
1788
1789         /*
1790          * This will use the passed string as format string and
1791          * replace the following specifiers:
1792          *
1793          * %n: the full id of the unit                 (foo@bar.waldo)
1794          * %N: the id of the unit without the suffix   (foo@bar)
1795          * %p: the prefix                              (foo)
1796          * %i: the instance                            (bar)
1797          */
1798
1799         const Specifier table[] = {
1800                 { 'n', specifier_string,              u->meta.id },
1801                 { 'N', specifier_prefix_and_instance, NULL },
1802                 { 'p', specifier_prefix,              NULL },
1803                 { 'i', specifier_string,              u->meta.instance },
1804                 { 0, NULL, NULL }
1805         };
1806
1807         assert(u);
1808         assert(format);
1809
1810         return specifier_printf(format, table, u);
1811 }
1812
1813 char *unit_full_printf(Unit *u, const char *format) {
1814
1815         /* This is similar to unit_name_printf() but also supports
1816          * unescaping */
1817
1818         const Specifier table[] = {
1819                 { 'n', specifier_string,              u->meta.id },
1820                 { 'N', specifier_prefix_and_instance, NULL },
1821                 { 'p', specifier_prefix,              NULL },
1822                 { 'P', specifier_prefix_unescaped,    NULL },
1823                 { 'i', specifier_string,              u->meta.instance },
1824                 { 'I', specifier_instance_unescaped,  NULL },
1825                 { 0, NULL, NULL }
1826         };
1827
1828         assert(u);
1829         assert(format);
1830
1831         return specifier_printf(format, table, u);
1832 }
1833
1834 char **unit_full_printf_strv(Unit *u, char **l) {
1835         size_t n;
1836         char **r, **i, **j;
1837
1838         /* Applies unit_full_printf to every entry in l */
1839
1840         assert(u);
1841
1842         n = strv_length(l);
1843         if (!(r = new(char*, n+1)))
1844                 return NULL;
1845
1846         for (i = l, j = r; *i; i++, j++)
1847                 if (!(*j = unit_full_printf(u, *i)))
1848                         goto fail;
1849
1850         *j = NULL;
1851         return r;
1852
1853 fail:
1854         j--;
1855         while (j >= r)
1856                 free(*j);
1857
1858         free(r);
1859
1860         return NULL;
1861 }
1862
1863 int unit_watch_bus_name(Unit *u, const char *name) {
1864         assert(u);
1865         assert(name);
1866
1867         /* Watch a specific name on the bus. We only support one unit
1868          * watching each name for now. */
1869
1870         return hashmap_put(u->meta.manager->watch_bus, name, u);
1871 }
1872
1873 void unit_unwatch_bus_name(Unit *u, const char *name) {
1874         assert(u);
1875         assert(name);
1876
1877         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1878 }
1879
1880 bool unit_can_serialize(Unit *u) {
1881         assert(u);
1882
1883         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1884 }
1885
1886 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1887         int r;
1888
1889         assert(u);
1890         assert(f);
1891         assert(fds);
1892
1893         if (!unit_can_serialize(u))
1894                 return 0;
1895
1896         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1897                 return r;
1898
1899         if (u->meta.job)
1900                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1901
1902         /* End marker */
1903         fputc('\n', f);
1904         return 0;
1905 }
1906
1907 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1908         va_list ap;
1909
1910         assert(u);
1911         assert(f);
1912         assert(key);
1913         assert(format);
1914
1915         fputs(key, f);
1916         fputc('=', f);
1917
1918         va_start(ap, format);
1919         vfprintf(f, format, ap);
1920         va_end(ap);
1921
1922         fputc('\n', f);
1923 }
1924
1925 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1926         assert(u);
1927         assert(f);
1928         assert(key);
1929         assert(value);
1930
1931         fprintf(f, "%s=%s\n", key, value);
1932 }
1933
1934 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1935         int r;
1936
1937         assert(u);
1938         assert(f);
1939         assert(fds);
1940
1941         if (!unit_can_serialize(u))
1942                 return 0;
1943
1944         for (;;) {
1945                 char line[1024], *l, *v;
1946                 size_t k;
1947
1948                 if (!fgets(line, sizeof(line), f)) {
1949                         if (feof(f))
1950                                 return 0;
1951                         return -errno;
1952                 }
1953
1954                 l = strstrip(line);
1955
1956                 /* End marker */
1957                 if (l[0] == 0)
1958                         return 0;
1959
1960                 k = strcspn(l, "=");
1961
1962                 if (l[k] == '=') {
1963                         l[k] = 0;
1964                         v = l+k+1;
1965                 } else
1966                         v = l+k;
1967
1968                 if (streq(l, "job")) {
1969                         JobType type;
1970
1971                         if ((type = job_type_from_string(v)) < 0)
1972                                 log_debug("Failed to parse job type value %s", v);
1973                         else
1974                                 u->meta.deserialized_job = type;
1975
1976                         continue;
1977                 }
1978
1979                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1980                         return r;
1981         }
1982 }
1983
1984 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1985         Unit *device;
1986         char *e;
1987         int r;
1988
1989         assert(u);
1990
1991         if (!what)
1992                 return 0;
1993
1994         /* Adds in links to the device node that this unit is based on */
1995
1996         if (!is_device_path(what))
1997                 return 0;
1998
1999         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2000                 return -ENOMEM;
2001
2002         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2003         free(e);
2004
2005         if (r < 0)
2006                 return r;
2007
2008         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2009                 return r;
2010
2011         if (wants)
2012                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2013                         return r;
2014
2015         return 0;
2016 }
2017
2018 int unit_coldplug(Unit *u) {
2019         int r;
2020
2021         assert(u);
2022
2023         if (UNIT_VTABLE(u)->coldplug)
2024                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2025                         return r;
2026
2027         if (u->meta.deserialized_job >= 0) {
2028                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2029                         return r;
2030
2031                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2032         }
2033
2034         return 0;
2035 }
2036
2037 void unit_status_printf(Unit *u, const char *format, ...) {
2038         va_list ap;
2039
2040         assert(u);
2041         assert(format);
2042
2043         if (!UNIT_VTABLE(u)->show_status)
2044                 return;
2045
2046         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2047                 return;
2048
2049         if (!u->meta.manager->show_status)
2050                 return;
2051
2052         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2053                 return;
2054
2055         va_start(ap, format);
2056         status_vprintf(format, ap);
2057         va_end(ap);
2058 }
2059
2060 bool unit_need_daemon_reload(Unit *u) {
2061         struct stat st;
2062
2063         assert(u);
2064
2065         if (!u->meta.fragment_path)
2066                 return false;
2067
2068         zero(st);
2069         if (stat(u->meta.fragment_path, &st) < 0)
2070                 /* What, cannot access this anymore? */
2071                 return true;
2072
2073         return
2074                 u->meta.fragment_mtime &&
2075                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2076 }
2077
2078 void unit_reset_maintenance(Unit *u) {
2079         assert(u);
2080
2081         if (UNIT_VTABLE(u)->reset_maintenance)
2082                 UNIT_VTABLE(u)->reset_maintenance(u);
2083 }
2084
2085 Unit *unit_following(Unit *u) {
2086         assert(u);
2087
2088         if (UNIT_VTABLE(u)->following)
2089                 return UNIT_VTABLE(u)->following(u);
2090
2091         return NULL;
2092 }
2093
2094 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
2095         [UNIT_SERVICE] = "service",
2096         [UNIT_TIMER] = "timer",
2097         [UNIT_SOCKET] = "socket",
2098         [UNIT_TARGET] = "target",
2099         [UNIT_DEVICE] = "device",
2100         [UNIT_MOUNT] = "mount",
2101         [UNIT_AUTOMOUNT] = "automount",
2102         [UNIT_SNAPSHOT] = "snapshot",
2103         [UNIT_SWAP] = "swap"
2104 };
2105
2106 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
2107
2108 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2109         [UNIT_STUB] = "stub",
2110         [UNIT_LOADED] = "loaded",
2111         [UNIT_FAILED] = "failed",
2112         [UNIT_MERGED] = "merged"
2113 };
2114
2115 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2116
2117 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2118         [UNIT_ACTIVE] = "active",
2119         [UNIT_RELOADING] = "reloading",
2120         [UNIT_INACTIVE] = "inactive",
2121         [UNIT_MAINTENANCE] = "maintenance",
2122         [UNIT_ACTIVATING] = "activating",
2123         [UNIT_DEACTIVATING] = "deactivating"
2124 };
2125
2126 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2127
2128 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2129         [UNIT_REQUIRES] = "Requires",
2130         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2131         [UNIT_WANTS] = "Wants",
2132         [UNIT_REQUISITE] = "Requisite",
2133         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2134         [UNIT_REQUIRED_BY] = "RequiredBy",
2135         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2136         [UNIT_WANTED_BY] = "WantedBy",
2137         [UNIT_CONFLICTS] = "Conflicts",
2138         [UNIT_BEFORE] = "Before",
2139         [UNIT_AFTER] = "After",
2140         [UNIT_REFERENCES] = "References",
2141         [UNIT_REFERENCED_BY] = "ReferencedBy",
2142         [UNIT_ON_FAILURE] = "OnFailure"
2143 };
2144
2145 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2146
2147 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2148         [KILL_CONTROL_GROUP] = "control-group",
2149         [KILL_PROCESS_GROUP] = "process-group",
2150         [KILL_PROCESS] = "process",
2151         [KILL_NONE] = "none"
2152 };
2153
2154 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);