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 #include "missing.h"
  45
  46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  47         [UNIT_SERVICE] = &service_vtable,
  48         [UNIT_TIMER] = &timer_vtable,
  49         [UNIT_SOCKET] = &socket_vtable,
  50         [UNIT_TARGET] = &target_vtable,
  51         [UNIT_DEVICE] = &device_vtable,
  52         [UNIT_MOUNT] = &mount_vtable,
  53         [UNIT_AUTOMOUNT] = &automount_vtable,
  54         [UNIT_SNAPSHOT] = &snapshot_vtable,
  55         [UNIT_SWAP] = &swap_vtable,
  56         [UNIT_PATH] = &path_vtable
  57 };
  58
  59 Unit *unit_new(Manager *m) {
  60         Unit *u;
  61
  62         assert(m);
  63
  64         if (!(u = new0(Unit, 1)))
  65                 return NULL;
  66
  67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  68                 free(u);
  69                 return NULL;
  70         }
  71
  72         u->meta.manager = m;
  73         u->meta.type = _UNIT_TYPE_INVALID;
  74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  75         u->meta.default_dependencies = true;
  76
  77         return u;
  78 }
  79
  80 bool unit_has_name(Unit *u, const char *name) {
  81         assert(u);
  82         assert(name);
  83
  84         return !!set_get(u->meta.names, (char*) name);
  85 }
  86
  87 int unit_add_name(Unit *u, const char *text) {
  88         UnitType t;
  89         char *s, *i = NULL;
  90         int r;
  91
  92         assert(u);
  93         assert(text);
  94
  95         if (unit_name_is_template(text)) {
  96                 if (!u->meta.instance)
  97                         return -EINVAL;
  98
  99                 s = unit_name_replace_instance(text, u->meta.instance);
 100         } else
 101                 s = strdup(text);
 102
 103         if (!s)
 104                 return -ENOMEM;
 105
 106         if (!unit_name_is_valid(s)) {
 107                 r = -EINVAL;
 108                 goto fail;
 109         }
 110
 111         assert_se((t = unit_name_to_type(s)) >= 0);
 112
 113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 114                 r = -EINVAL;
 115                 goto fail;
 116         }
 117
 118         if ((r = unit_name_to_instance(s, &i)) < 0)
 119                 goto fail;
 120
 121         if (i && unit_vtable[t]->no_instances)
 122                 goto fail;
 123
 124         /* Ensure that this unit is either instanced or not instanced,
 125          * but not both. */
 126         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 127                 r = -EINVAL;
 128                 goto fail;
 129         }
 130
 131         if (unit_vtable[t]->no_alias &&
 132             !set_isempty(u->meta.names) &&
 133             !set_get(u->meta.names, s)) {
 134                 r = -EEXIST;
 135                 goto fail;
 136         }
 137
 138         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 139                 r = -E2BIG;
 140                 goto fail;
 141         }
 142
 143         if ((r = set_put(u->meta.names, s)) < 0) {
 144                 if (r == -EEXIST)
 145                         r = 0;
 146                 goto fail;
 147         }
 148
 149         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 150                 set_remove(u->meta.names, s);
 151                 goto fail;
 152         }
 153
 154         if (u->meta.type == _UNIT_TYPE_INVALID) {
 155
 156                 u->meta.type = t;
 157                 u->meta.id = s;
 158                 u->meta.instance = i;
 159
 160                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 161
 162                 if (UNIT_VTABLE(u)->init)
 163                         UNIT_VTABLE(u)->init(u);
 164         } else
 165                 free(i);
 166
 167         unit_add_to_dbus_queue(u);
 168         return 0;
 169
 170 fail:
 171         free(s);
 172         free(i);
 173
 174         return r;
 175 }
 176
 177 int unit_choose_id(Unit *u, const char *name) {
 178         char *s, *t = NULL, *i;
 179         int r;
 180
 181         assert(u);
 182         assert(name);
 183
 184         if (unit_name_is_template(name)) {
 185
 186                 if (!u->meta.instance)
 187                         return -EINVAL;
 188
 189                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 190                         return -ENOMEM;
 191
 192                 name = t;
 193         }
 194
 195         /* Selects one of the names of this unit as the id */
 196         s = set_get(u->meta.names, (char*) name);
 197         free(t);
 198
 199         if (!s)
 200                 return -ENOENT;
 201
 202         if ((r = unit_name_to_instance(s, &i)) < 0)
 203                 return r;
 204
 205         u->meta.id = s;
 206
 207         free(u->meta.instance);
 208         u->meta.instance = i;
 209
 210         unit_add_to_dbus_queue(u);
 211
 212         return 0;
 213 }
 214
 215 int unit_set_description(Unit *u, const char *description) {
 216         char *s;
 217
 218         assert(u);
 219
 220         if (!(s = strdup(description)))
 221                 return -ENOMEM;
 222
 223         free(u->meta.description);
 224         u->meta.description = s;
 225
 226         unit_add_to_dbus_queue(u);
 227         return 0;
 228 }
 229
 230 bool unit_check_gc(Unit *u) {
 231         assert(u);
 232
 233         if (u->meta.load_state == UNIT_STUB)
 234                 return true;
 235
 236         if (UNIT_VTABLE(u)->no_gc)
 237                 return true;
 238
 239         if (u->meta.no_gc)
 240                 return true;
 241
 242         if (u->meta.job)
 243                 return true;
 244
 245         if (unit_active_state(u) != UNIT_INACTIVE)
 246                 return true;
 247
 248         if (UNIT_VTABLE(u)->check_gc)
 249                 if (UNIT_VTABLE(u)->check_gc(u))
 250                         return true;
 251
 252         return false;
 253 }
 254
 255 void unit_add_to_load_queue(Unit *u) {
 256         assert(u);
 257         assert(u->meta.type != _UNIT_TYPE_INVALID);
 258
 259         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 260                 return;
 261
 262         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 263         u->meta.in_load_queue = true;
 264 }
 265
 266 void unit_add_to_cleanup_queue(Unit *u) {
 267         assert(u);
 268
 269         if (u->meta.in_cleanup_queue)
 270                 return;
 271
 272         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 273         u->meta.in_cleanup_queue = true;
 274 }
 275
 276 void unit_add_to_gc_queue(Unit *u) {
 277         assert(u);
 278
 279         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 280                 return;
 281
 282         if (unit_check_gc(u))
 283                 return;
 284
 285         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 286         u->meta.in_gc_queue = true;
 287
 288         u->meta.manager->n_in_gc_queue ++;
 289
 290         if (u->meta.manager->gc_queue_timestamp <= 0)
 291                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 292 }
 293
 294 void unit_add_to_dbus_queue(Unit *u) {
 295         assert(u);
 296         assert(u->meta.type != _UNIT_TYPE_INVALID);
 297
 298         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 299                 return;
 300
 301         /* Shortcut things if nobody cares */
 302         if (!bus_has_subscriber(u->meta.manager)) {
 303                 u->meta.sent_dbus_new_signal = true;
 304                 return;
 305         }
 306
 307         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 308         u->meta.in_dbus_queue = true;
 309 }
 310
 311 static void bidi_set_free(Unit *u, Set *s) {
 312         Iterator i;
 313         Unit *other;
 314
 315         assert(u);
 316
 317         /* Frees the set and makes sure we are dropped from the
 318          * inverse pointers */
 319
 320         SET_FOREACH(other, s, i) {
 321                 UnitDependency d;
 322
 323                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 324                         set_remove(other->meta.dependencies[d], u);
 325
 326                 unit_add_to_gc_queue(other);
 327         }
 328
 329         set_free(s);
 330 }
 331
 332 void unit_free(Unit *u) {
 333         UnitDependency d;
 334         Iterator i;
 335         char *t;
 336
 337         assert(u);
 338
 339         bus_unit_send_removed_signal(u);
 340
 341         if (u->meta.load_state != UNIT_STUB)
 342                 if (UNIT_VTABLE(u)->done)
 343                         UNIT_VTABLE(u)->done(u);
 344
 345         SET_FOREACH(t, u->meta.names, i)
 346                 hashmap_remove_value(u->meta.manager->units, t, u);
 347
 348         if (u->meta.job)
 349                 job_free(u->meta.job);
 350
 351         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 352                 bidi_set_free(u, u->meta.dependencies[d]);
 353
 354         if (u->meta.type != _UNIT_TYPE_INVALID)
 355                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 356
 357         if (u->meta.in_load_queue)
 358                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 359
 360         if (u->meta.in_dbus_queue)
 361                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 362
 363         if (u->meta.in_cleanup_queue)
 364                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 365
 366         if (u->meta.in_gc_queue) {
 367                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 368                 u->meta.manager->n_in_gc_queue--;
 369         }
 370
 371         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 372
 373         free(u->meta.description);
 374         free(u->meta.fragment_path);
 375
 376         set_free_free(u->meta.names);
 377
 378         free(u->meta.instance);
 379
 380         free(u);
 381 }
 382
 383 UnitActiveState unit_active_state(Unit *u) {
 384         assert(u);
 385
 386         if (u->meta.load_state == UNIT_MERGED)
 387                 return unit_active_state(unit_follow_merge(u));
 388
 389         /* After a reload it might happen that a unit is not correctly
 390          * loaded but still has a process around. That's why we won't
 391          * shortcut failed loading to UNIT_INACTIVE_MAINTENANCE. */
 392
 393         return UNIT_VTABLE(u)->active_state(u);
 394 }
 395
 396 const char* unit_sub_state_to_string(Unit *u) {
 397         assert(u);
 398
 399         return UNIT_VTABLE(u)->sub_state_to_string(u);
 400 }
 401
 402 static void complete_move(Set **s, Set **other) {
 403         assert(s);
 404         assert(other);
 405
 406         if (!*other)
 407                 return;
 408
 409         if (*s)
 410                 set_move(*s, *other);
 411         else {
 412                 *s = *other;
 413                 *other = NULL;
 414         }
 415 }
 416
 417 static void merge_names(Unit *u, Unit *other) {
 418         char *t;
 419         Iterator i;
 420
 421         assert(u);
 422         assert(other);
 423
 424         complete_move(&u->meta.names, &other->meta.names);
 425
 426         set_free_free(other->meta.names);
 427         other->meta.names = NULL;
 428         other->meta.id = NULL;
 429
 430         SET_FOREACH(t, u->meta.names, i)
 431                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 432 }
 433
 434 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 435         Iterator i;
 436         Unit *back;
 437         int r;
 438
 439         assert(u);
 440         assert(other);
 441         assert(d < _UNIT_DEPENDENCY_MAX);
 442
 443         SET_FOREACH(back, other->meta.dependencies[d], i) {
 444                 UnitDependency k;
 445
 446                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 447                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 448
 449                                 if (r == -EEXIST)
 450                                         set_remove(back->meta.dependencies[k], other);
 451                                 else
 452                                         assert(r == -ENOENT);
 453                         }
 454         }
 455
 456         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 457
 458         set_free(other->meta.dependencies[d]);
 459         other->meta.dependencies[d] = NULL;
 460 }
 461
 462 int unit_merge(Unit *u, Unit *other) {
 463         UnitDependency d;
 464
 465         assert(u);
 466         assert(other);
 467         assert(u->meta.manager == other->meta.manager);
 468         assert(u->meta.type != _UNIT_TYPE_INVALID);
 469
 470         other = unit_follow_merge(other);
 471
 472         if (other == u)
 473                 return 0;
 474
 475         if (u->meta.type != other->meta.type)
 476                 return -EINVAL;
 477
 478         if (!u->meta.instance != !other->meta.instance)
 479                 return -EINVAL;
 480
 481         if (other->meta.load_state != UNIT_STUB &&
 482             other->meta.load_state != UNIT_FAILED)
 483                 return -EEXIST;
 484
 485         if (other->meta.job)
 486                 return -EEXIST;
 487
 488         if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(other)))
 489                 return -EEXIST;
 490
 491         /* Merge names */
 492         merge_names(u, other);
 493
 494         /* Merge dependencies */
 495         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 496                 merge_dependencies(u, other, d);
 497
 498         other->meta.load_state = UNIT_MERGED;
 499         other->meta.merged_into = u;
 500
 501         /* If there is still some data attached to the other node, we
 502          * don't need it anymore, and can free it. */
 503         if (other->meta.load_state != UNIT_STUB)
 504                 if (UNIT_VTABLE(other)->done)
 505                         UNIT_VTABLE(other)->done(other);
 506
 507         unit_add_to_dbus_queue(u);
 508         unit_add_to_cleanup_queue(other);
 509
 510         return 0;
 511 }
 512
 513 int unit_merge_by_name(Unit *u, const char *name) {
 514         Unit *other;
 515         int r;
 516         char *s = NULL;
 517
 518         assert(u);
 519         assert(name);
 520
 521         if (unit_name_is_template(name)) {
 522                 if (!u->meta.instance)
 523                         return -EINVAL;
 524
 525                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 526                         return -ENOMEM;
 527
 528                 name = s;
 529         }
 530
 531         if (!(other = manager_get_unit(u->meta.manager, name)))
 532                 r = unit_add_name(u, name);
 533         else
 534                 r = unit_merge(u, other);
 535
 536         free(s);
 537         return r;
 538 }
 539
 540 Unit* unit_follow_merge(Unit *u) {
 541         assert(u);
 542
 543         while (u->meta.load_state == UNIT_MERGED)
 544                 assert_se(u = u->meta.merged_into);
 545
 546         return u;
 547 }
 548
 549 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 550         int r;
 551
 552         assert(u);
 553         assert(c);
 554
 555         if (c->std_output != EXEC_OUTPUT_KMSG &&
 556             c->std_output != EXEC_OUTPUT_SYSLOG &&
 557             c->std_error != EXEC_OUTPUT_KMSG &&
 558             c->std_error != EXEC_OUTPUT_SYSLOG)
 559                 return 0;
 560
 561         /* If syslog or kernel logging is requested, make sure our own
 562          * logging daemon is run first. */
 563
 564         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 565                 return r;
 566
 567         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 568                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 569                         return r;
 570
 571         return 0;
 572 }
 573
 574 const char *unit_description(Unit *u) {
 575         assert(u);
 576
 577         if (u->meta.description)
 578                 return u->meta.description;
 579
 580         return u->meta.id;
 581 }
 582
 583 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 584         char *t;
 585         UnitDependency d;
 586         Iterator i;
 587         char *p2;
 588         const char *prefix2;
 589         CGroupBonding *b;
 590         char
 591                 timestamp1[FORMAT_TIMESTAMP_MAX],
 592                 timestamp2[FORMAT_TIMESTAMP_MAX],
 593                 timestamp3[FORMAT_TIMESTAMP_MAX],
 594                 timestamp4[FORMAT_TIMESTAMP_MAX],
 595                 timespan[FORMAT_TIMESPAN_MAX];
 596         Unit *following;
 597
 598         assert(u);
 599         assert(u->meta.type >= 0);
 600
 601         if (!prefix)
 602                 prefix = "";
 603         p2 = strappend(prefix, "\t");
 604         prefix2 = p2 ? p2 : prefix;
 605
 606         fprintf(f,
 607                 "%s-> Unit %s:\n"
 608                 "%s\tDescription: %s\n"
 609                 "%s\tInstance: %s\n"
 610                 "%s\tUnit Load State: %s\n"
 611                 "%s\tUnit Active State: %s\n"
 612                 "%s\tInactive Exit Timestamp: %s\n"
 613                 "%s\tActive Enter Timestamp: %s\n"
 614                 "%s\tActive Exit Timestamp: %s\n"
 615                 "%s\tInactive Enter Timestamp: %s\n"
 616                 "%s\tGC Check Good: %s\n"
 617                 "%s\tNeed Daemon Reload: %s\n",
 618                 prefix, u->meta.id,
 619                 prefix, unit_description(u),
 620                 prefix, strna(u->meta.instance),
 621                 prefix, unit_load_state_to_string(u->meta.load_state),
 622                 prefix, unit_active_state_to_string(unit_active_state(u)),
 623                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 624                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 625                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 626                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 627                 prefix, yes_no(unit_check_gc(u)),
 628                 prefix, yes_no(unit_need_daemon_reload(u)));
 629
 630         SET_FOREACH(t, u->meta.names, i)
 631                 fprintf(f, "%s\tName: %s\n", prefix, t);
 632
 633         if ((following = unit_following(u)))
 634                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 635
 636         if (u->meta.fragment_path)
 637                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 638
 639         if (u->meta.job_timeout > 0)
 640                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 641
 642         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 643                 Unit *other;
 644
 645                 SET_FOREACH(other, u->meta.dependencies[d], i)
 646                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 647         }
 648
 649         if (u->meta.load_state == UNIT_LOADED) {
 650                 fprintf(f,
 651                         "%s\tRecursive Stop: %s\n"
 652                         "%s\tStopWhenUnneeded: %s\n"
 653                         "%s\tRefuseManualStart: %s\n"
 654                         "%s\tRefuseManualStop: %s\n"
 655                         "%s\tDefaultDependencies: %s\n"
 656                         "%s\tIgnoreDependencyFailure: %s\n",
 657                         prefix, yes_no(u->meta.recursive_stop),
 658                         prefix, yes_no(u->meta.stop_when_unneeded),
 659                         prefix, yes_no(u->meta.refuse_manual_start),
 660                         prefix, yes_no(u->meta.refuse_manual_stop),
 661                         prefix, yes_no(u->meta.default_dependencies),
 662                         prefix, yes_no(u->meta.ignore_dependency_failure));
 663
 664                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 665                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 666                                 prefix, b->controller, b->path);
 667
 668                 if (UNIT_VTABLE(u)->dump)
 669                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 670
 671         } else if (u->meta.load_state == UNIT_MERGED)
 672                 fprintf(f,
 673                         "%s\tMerged into: %s\n",
 674                         prefix, u->meta.merged_into->meta.id);
 675
 676         if (u->meta.job)
 677                 job_dump(u->meta.job, f, prefix2);
 678
 679         free(p2);
 680 }
 681
 682 /* Common implementation for multiple backends */
 683 int unit_load_fragment_and_dropin(Unit *u) {
 684         int r;
 685
 686         assert(u);
 687
 688         /* Load a .service file */
 689         if ((r = unit_load_fragment(u)) < 0)
 690                 return r;
 691
 692         if (u->meta.load_state == UNIT_STUB)
 693                 return -ENOENT;
 694
 695         /* Load drop-in directory data */
 696         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 697                 return r;
 698
 699         return 0;
 700 }
 701
 702 /* Common implementation for multiple backends */
 703 int unit_load_fragment_and_dropin_optional(Unit *u) {
 704         int r;
 705
 706         assert(u);
 707
 708         /* Same as unit_load_fragment_and_dropin(), but whether
 709          * something can be loaded or not doesn't matter. */
 710
 711         /* Load a .service file */
 712         if ((r = unit_load_fragment(u)) < 0)
 713                 return r;
 714
 715         if (u->meta.load_state == UNIT_STUB)
 716                 u->meta.load_state = UNIT_LOADED;
 717
 718         /* Load drop-in directory data */
 719         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 720                 return r;
 721
 722         return 0;
 723 }
 724
 725 /* Common implementation for multiple backends */
 726 int unit_load_nop(Unit *u) {
 727         assert(u);
 728
 729         if (u->meta.load_state == UNIT_STUB)
 730                 u->meta.load_state = UNIT_LOADED;
 731
 732         return 0;
 733 }
 734
 735 int unit_load(Unit *u) {
 736         int r;
 737
 738         assert(u);
 739
 740         if (u->meta.in_load_queue) {
 741                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 742                 u->meta.in_load_queue = false;
 743         }
 744
 745         if (u->meta.type == _UNIT_TYPE_INVALID)
 746                 return -EINVAL;
 747
 748         if (u->meta.load_state != UNIT_STUB)
 749                 return 0;
 750
 751         if (UNIT_VTABLE(u)->load)
 752                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 753                         goto fail;
 754
 755         if (u->meta.load_state == UNIT_STUB) {
 756                 r = -ENOENT;
 757                 goto fail;
 758         }
 759
 760         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 761
 762         unit_add_to_dbus_queue(unit_follow_merge(u));
 763         unit_add_to_gc_queue(u);
 764
 765         return 0;
 766
 767 fail:
 768         u->meta.load_state = UNIT_FAILED;
 769         unit_add_to_dbus_queue(u);
 770
 771         log_notice("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 772
 773         return r;
 774 }
 775
 776 /* Errors:
 777  *         -EBADR:     This unit type does not support starting.
 778  *         -EALREADY:  Unit is already started.
 779  *         -EAGAIN:    An operation is already in progress. Retry later.
 780  *         -ECANCELED: Too many requests for now.
 781  */
 782 int unit_start(Unit *u) {
 783         UnitActiveState state;
 784
 785         assert(u);
 786
 787         if (u->meta.load_state != UNIT_LOADED)
 788                 return -EINVAL;
 789
 790         /* If this is already (being) started, then this will
 791          * succeed. Note that this will even succeed if this unit is
 792          * not startable by the user. This is relied on to detect when
 793          * we need to wait for units and when waiting is finished. */
 794         state = unit_active_state(u);
 795         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 796                 return -EALREADY;
 797
 798         /* If it is stopped, but we cannot start it, then fail */
 799         if (!UNIT_VTABLE(u)->start)
 800                 return -EBADR;
 801
 802         /* We don't suppress calls to ->start() here when we are
 803          * already starting, to allow this request to be used as a
 804          * "hurry up" call, for example when the unit is in some "auto
 805          * restart" state where it waits for a holdoff timer to elapse
 806          * before it will start again. */
 807
 808         unit_add_to_dbus_queue(u);
 809
 810         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 811
 812         return UNIT_VTABLE(u)->start(u);
 813 }
 814
 815 bool unit_can_start(Unit *u) {
 816         assert(u);
 817
 818         return !!UNIT_VTABLE(u)->start;
 819 }
 820
 821 /* Errors:
 822  *         -EBADR:    This unit type does not support stopping.
 823  *         -EALREADY: Unit is already stopped.
 824  *         -EAGAIN:   An operation is already in progress. Retry later.
 825  */
 826 int unit_stop(Unit *u) {
 827         UnitActiveState state;
 828
 829         assert(u);
 830
 831         state = unit_active_state(u);
 832         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
 833                 return -EALREADY;
 834
 835         if (!UNIT_VTABLE(u)->stop)
 836                 return -EBADR;
 837
 838         unit_add_to_dbus_queue(u);
 839
 840         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 841
 842         return UNIT_VTABLE(u)->stop(u);
 843 }
 844
 845 /* Errors:
 846  *         -EBADR:    This unit type does not support reloading.
 847  *         -ENOEXEC:  Unit is not started.
 848  *         -EAGAIN:   An operation is already in progress. Retry later.
 849  */
 850 int unit_reload(Unit *u) {
 851         UnitActiveState state;
 852
 853         assert(u);
 854
 855         if (u->meta.load_state != UNIT_LOADED)
 856                 return -EINVAL;
 857
 858         if (!unit_can_reload(u))
 859                 return -EBADR;
 860
 861         state = unit_active_state(u);
 862         if (unit_active_state(u) == UNIT_RELOADING)
 863                 return -EALREADY;
 864
 865         if (unit_active_state(u) != UNIT_ACTIVE)
 866                 return -ENOEXEC;
 867
 868         unit_add_to_dbus_queue(u);
 869         return UNIT_VTABLE(u)->reload(u);
 870 }
 871
 872 bool unit_can_reload(Unit *u) {
 873         assert(u);
 874
 875         if (!UNIT_VTABLE(u)->reload)
 876                 return false;
 877
 878         if (!UNIT_VTABLE(u)->can_reload)
 879                 return true;
 880
 881         return UNIT_VTABLE(u)->can_reload(u);
 882 }
 883
 884 static void unit_check_uneeded(Unit *u) {
 885         Iterator i;
 886         Unit *other;
 887
 888         assert(u);
 889
 890         /* If this service shall be shut down when unneeded then do
 891          * so. */
 892
 893         if (!u->meta.stop_when_unneeded)
 894                 return;
 895
 896         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 897                 return;
 898
 899         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 900                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 901                         return;
 902
 903         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 904                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 905                         return;
 906
 907         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 908                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 909                         return;
 910
 911         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 912
 913         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 914         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 915 }
 916
 917 static void retroactively_start_dependencies(Unit *u) {
 918         Iterator i;
 919         Unit *other;
 920
 921         assert(u);
 922         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 923
 924         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 925                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 926                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 927
 928         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 929                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 930                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 931
 932         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 933                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 934                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 935
 936         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 937                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 938                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 939
 940         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 941                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 942                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 943
 944         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 945                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 946                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 947 }
 948
 949 static void retroactively_stop_dependencies(Unit *u) {
 950         Iterator i;
 951         Unit *other;
 952
 953         assert(u);
 954         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 955
 956         if (u->meta.recursive_stop) {
 957                 /* Pull down units need us recursively if enabled */
 958                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 959                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 960                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 961         }
 962
 963         /* Garbage collect services that might not be needed anymore, if enabled */
 964         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 965                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 966                         unit_check_uneeded(other);
 967         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 968                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 969                         unit_check_uneeded(other);
 970         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 971                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 972                         unit_check_uneeded(other);
 973         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 974                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 975                         unit_check_uneeded(other);
 976         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
 977                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 978                         unit_check_uneeded(other);
 979 }
 980
 981 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 982         dual_timestamp ts;
 983         bool unexpected;
 984
 985         assert(u);
 986         assert(os < _UNIT_ACTIVE_STATE_MAX);
 987         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 988
 989         /* Note that this is called for all low-level state changes,
 990          * even if they might map to the same high-level
 991          * UnitActiveState! That means that ns == os is OK an expected
 992          * behaviour here. For example: if a mount point is remounted
 993          * this function will be called too and the utmp code below
 994          * relies on that! */
 995
 996         dual_timestamp_get(&ts);
 997
 998         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 999                 u->meta.inactive_exit_timestamp = ts;
1000         else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1001                 u->meta.inactive_enter_timestamp = ts;
1002
1003         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1004                 u->meta.active_enter_timestamp = ts;
1005         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1006                 u->meta.active_exit_timestamp = ts;
1007
1008         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1009                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1010
1011         timer_unit_notify(u, ns);
1012         path_unit_notify(u, ns);
1013
1014         if (u->meta.job) {
1015                 unexpected = false;
1016
1017                 if (u->meta.job->state == JOB_WAITING)
1018
1019                         /* So we reached a different state for this
1020                          * job. Let's see if we can run it now if it
1021                          * failed previously due to EAGAIN. */
1022                         job_add_to_run_queue(u->meta.job);
1023
1024                 /* Let's check whether this state change constitutes a
1025                  * finished job, or maybe cotradicts a running job and
1026                  * hence needs to invalidate jobs. */
1027
1028                 switch (u->meta.job->type) {
1029
1030                 case JOB_START:
1031                 case JOB_VERIFY_ACTIVE:
1032
1033                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1034                                 job_finish_and_invalidate(u->meta.job, true);
1035                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1036                                 unexpected = true;
1037                                 job_finish_and_invalidate(u->meta.job, false);
1038                         }
1039
1040                         break;
1041
1042                 case JOB_RELOAD:
1043                 case JOB_RELOAD_OR_START:
1044
1045                         if (u->meta.job->state == JOB_RUNNING) {
1046                                 if (ns == UNIT_ACTIVE)
1047                                         job_finish_and_invalidate(u->meta.job, true);
1048                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1049                                         unexpected = true;
1050                                         job_finish_and_invalidate(u->meta.job, false);
1051                                 }
1052                         }
1053
1054                         break;
1055
1056                 case JOB_STOP:
1057                 case JOB_RESTART:
1058                 case JOB_TRY_RESTART:
1059
1060                         if (ns == UNIT_INACTIVE || ns == UNIT_MAINTENANCE)
1061                                 job_finish_and_invalidate(u->meta.job, true);
1062                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1063                                 unexpected = true;
1064                                 job_finish_and_invalidate(u->meta.job, false);
1065                         }
1066
1067                         break;
1068
1069                 default:
1070                         assert_not_reached("Job type unknown");
1071                 }
1072
1073         } else
1074                 unexpected = true;
1075
1076         /* If this state change happened without being requested by a
1077          * job, then let's retroactively start or stop
1078          * dependencies. We skip that step when deserializing, since
1079          * we don't want to create any additional jobs just because
1080          * something is already activated. */
1081
1082         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1083                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1084                         retroactively_start_dependencies(u);
1085                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1086                         retroactively_stop_dependencies(u);
1087         }
1088
1089         if (ns != os && ns == UNIT_MAINTENANCE) {
1090                 Iterator i;
1091                 Unit *other;
1092
1093                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1094                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1095
1096                 log_notice("Unit %s entered maintenance state.", u->meta.id);
1097         }
1098
1099         /* Some names are special */
1100         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1101                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1102                         /* The bus just might have become available,
1103                          * hence try to connect to it, if we aren't
1104                          * yet connected. */
1105                         bus_init(u->meta.manager);
1106
1107                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1108                         /* The syslog daemon just might have become
1109                          * available, hence try to connect to it, if
1110                          * we aren't yet connected. */
1111                         log_open();
1112
1113                 if (u->meta.type == UNIT_SERVICE &&
1114                     !UNIT_IS_ACTIVE_OR_RELOADING(os))
1115                         /* Write audit record if we have just finished starting up */
1116                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1117
1118         } else {
1119
1120                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1121                         /* The syslog daemon might just have
1122                          * terminated, hence try to disconnect from
1123                          * it. */
1124                         log_close_syslog();
1125
1126                 /* We don't care about D-Bus here, since we'll get an
1127                  * asynchronous notification for it anyway. */
1128
1129                 if (u->meta.type == UNIT_SERVICE &&
1130                     UNIT_IS_INACTIVE_OR_MAINTENANCE(ns) &&
1131                     !UNIT_IS_INACTIVE_OR_MAINTENANCE(os))
1132
1133                         /* Write audit record if we have just finished shutting down */
1134                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1135         }
1136
1137         /* Maybe we finished startup and are now ready for being
1138          * stopped because unneeded? */
1139         unit_check_uneeded(u);
1140
1141         unit_add_to_dbus_queue(u);
1142         unit_add_to_gc_queue(u);
1143 }
1144
1145 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1146         struct epoll_event ev;
1147
1148         assert(u);
1149         assert(fd >= 0);
1150         assert(w);
1151         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1152
1153         zero(ev);
1154         ev.data.ptr = w;
1155         ev.events = events;
1156
1157         if (epoll_ctl(u->meta.manager->epoll_fd,
1158                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1159                       fd,
1160                       &ev) < 0)
1161                 return -errno;
1162
1163         w->fd = fd;
1164         w->type = WATCH_FD;
1165         w->data.unit = u;
1166
1167         return 0;
1168 }
1169
1170 void unit_unwatch_fd(Unit *u, Watch *w) {
1171         assert(u);
1172         assert(w);
1173
1174         if (w->type == WATCH_INVALID)
1175                 return;
1176
1177         assert(w->type == WATCH_FD);
1178         assert(w->data.unit == u);
1179         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1180
1181         w->fd = -1;
1182         w->type = WATCH_INVALID;
1183         w->data.unit = NULL;
1184 }
1185
1186 int unit_watch_pid(Unit *u, pid_t pid) {
1187         assert(u);
1188         assert(pid >= 1);
1189
1190         /* Watch a specific PID. We only support one unit watching
1191          * each PID for now. */
1192
1193         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1194 }
1195
1196 void unit_unwatch_pid(Unit *u, pid_t pid) {
1197         assert(u);
1198         assert(pid >= 1);
1199
1200         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1201 }
1202
1203 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1204         struct itimerspec its;
1205         int flags, fd;
1206         bool ours;
1207
1208         assert(u);
1209         assert(w);
1210         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1211
1212         /* This will try to reuse the old timer if there is one */
1213
1214         if (w->type == WATCH_UNIT_TIMER) {
1215                 assert(w->data.unit == u);
1216                 assert(w->fd >= 0);
1217
1218                 ours = false;
1219                 fd = w->fd;
1220         } else if (w->type == WATCH_INVALID) {
1221
1222                 ours = true;
1223                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1224                         return -errno;
1225         } else
1226                 assert_not_reached("Invalid watch type");
1227
1228         zero(its);
1229
1230         if (delay <= 0) {
1231                 /* Set absolute time in the past, but not 0, since we
1232                  * don't want to disarm the timer */
1233                 its.it_value.tv_sec = 0;
1234                 its.it_value.tv_nsec = 1;
1235
1236                 flags = TFD_TIMER_ABSTIME;
1237         } else {
1238                 timespec_store(&its.it_value, delay);
1239                 flags = 0;
1240         }
1241
1242         /* This will also flush the elapse counter */
1243         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1244                 goto fail;
1245
1246         if (w->type == WATCH_INVALID) {
1247                 struct epoll_event ev;
1248
1249                 zero(ev);
1250                 ev.data.ptr = w;
1251                 ev.events = EPOLLIN;
1252
1253                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1254                         goto fail;
1255         }
1256
1257         w->type = WATCH_UNIT_TIMER;
1258         w->fd = fd;
1259         w->data.unit = u;
1260
1261         return 0;
1262
1263 fail:
1264         if (ours)
1265                 close_nointr_nofail(fd);
1266
1267         return -errno;
1268 }
1269
1270 void unit_unwatch_timer(Unit *u, Watch *w) {
1271         assert(u);
1272         assert(w);
1273
1274         if (w->type == WATCH_INVALID)
1275                 return;
1276
1277         assert(w->type == WATCH_UNIT_TIMER);
1278         assert(w->data.unit == u);
1279         assert(w->fd >= 0);
1280
1281         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1282         close_nointr_nofail(w->fd);
1283
1284         w->fd = -1;
1285         w->type = WATCH_INVALID;
1286         w->data.unit = NULL;
1287 }
1288
1289 bool unit_job_is_applicable(Unit *u, JobType j) {
1290         assert(u);
1291         assert(j >= 0 && j < _JOB_TYPE_MAX);
1292
1293         switch (j) {
1294
1295         case JOB_VERIFY_ACTIVE:
1296         case JOB_START:
1297                 return true;
1298
1299         case JOB_STOP:
1300         case JOB_RESTART:
1301         case JOB_TRY_RESTART:
1302                 return unit_can_start(u);
1303
1304         case JOB_RELOAD:
1305                 return unit_can_reload(u);
1306
1307         case JOB_RELOAD_OR_START:
1308                 return unit_can_reload(u) && unit_can_start(u);
1309
1310         default:
1311                 assert_not_reached("Invalid job type");
1312         }
1313 }
1314
1315 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1316
1317         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1318                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1319                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1320                 [UNIT_WANTS] = UNIT_WANTED_BY,
1321                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1322                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1323                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1324                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1325                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1326                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1327                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1328                 [UNIT_BEFORE] = UNIT_AFTER,
1329                 [UNIT_AFTER] = UNIT_BEFORE,
1330                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1331                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1332                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1333         };
1334         int r, q = 0, v = 0, w = 0;
1335
1336         assert(u);
1337         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1338         assert(other);
1339
1340         /* We won't allow dependencies on ourselves. We will not
1341          * consider them an error however. */
1342         if (u == other)
1343                 return 0;
1344
1345         if (UNIT_VTABLE(u)->no_requires &&
1346             (d == UNIT_REQUIRES ||
1347              d == UNIT_REQUIRES_OVERRIDABLE ||
1348              d == UNIT_REQUISITE ||
1349              d == UNIT_REQUISITE_OVERRIDABLE)) {
1350                     return -EINVAL;
1351         }
1352
1353         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1354                 return r;
1355
1356         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1357                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1358                         return r;
1359
1360         if (add_reference)
1361                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1362                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1363                         return r;
1364
1365         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1366                 return q;
1367
1368         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1369                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1370                         r = v;
1371                         goto fail;
1372                 }
1373
1374         if (add_reference) {
1375                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1376                         r = w;
1377                         goto fail;
1378                 }
1379
1380                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1381                         goto fail;
1382         }
1383
1384         unit_add_to_dbus_queue(u);
1385         return 0;
1386
1387 fail:
1388         if (q > 0)
1389                 set_remove(u->meta.dependencies[d], other);
1390
1391         if (v > 0)
1392                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1393
1394         if (w > 0)
1395                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1396
1397         return r;
1398 }
1399
1400 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1401         int r;
1402
1403         assert(u);
1404
1405         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1406                 return r;
1407
1408         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1409                 return r;
1410
1411         return 0;
1412 }
1413
1414 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1415         char *s;
1416
1417         assert(u);
1418         assert(name || path);
1419
1420         if (!name)
1421                 name = file_name_from_path(path);
1422
1423         if (!unit_name_is_template(name)) {
1424                 *p = NULL;
1425                 return name;
1426         }
1427
1428         if (u->meta.instance)
1429                 s = unit_name_replace_instance(name, u->meta.instance);
1430         else {
1431                 char *i;
1432
1433                 if (!(i = unit_name_to_prefix(u->meta.id)))
1434                         return NULL;
1435
1436                 s = unit_name_replace_instance(name, i);
1437                 free(i);
1438         }
1439
1440         if (!s)
1441                 return NULL;
1442
1443         *p = s;
1444         return s;
1445 }
1446
1447 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1448         Unit *other;
1449         int r;
1450         char *s;
1451
1452         assert(u);
1453         assert(name || path);
1454
1455         if (!(name = resolve_template(u, name, path, &s)))
1456                 return -ENOMEM;
1457
1458         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1459                 goto finish;
1460
1461         r = unit_add_dependency(u, d, other, add_reference);
1462
1463 finish:
1464         free(s);
1465         return r;
1466 }
1467
1468 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1469         Unit *other;
1470         int r;
1471         char *s;
1472
1473         assert(u);
1474         assert(name || path);
1475
1476         if (!(name = resolve_template(u, name, path, &s)))
1477                 return -ENOMEM;
1478
1479         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1480                 goto finish;
1481
1482         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1483
1484 finish:
1485         free(s);
1486         return r;
1487 }
1488
1489 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1490         Unit *other;
1491         int r;
1492         char *s;
1493
1494         assert(u);
1495         assert(name || path);
1496
1497         if (!(name = resolve_template(u, name, path, &s)))
1498                 return -ENOMEM;
1499
1500         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1501                 goto finish;
1502
1503         r = unit_add_dependency(other, d, u, add_reference);
1504
1505 finish:
1506         free(s);
1507         return r;
1508 }
1509
1510 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1511         Unit *other;
1512         int r;
1513         char *s;
1514
1515         assert(u);
1516         assert(name || path);
1517
1518         if (!(name = resolve_template(u, name, path, &s)))
1519                 return -ENOMEM;
1520
1521         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1522                 goto finish;
1523
1524         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1525                 goto finish;
1526
1527 finish:
1528         free(s);
1529         return r;
1530 }
1531
1532 int set_unit_path(const char *p) {
1533         char *cwd, *c;
1534         int r;
1535
1536         /* This is mostly for debug purposes */
1537
1538         if (path_is_absolute(p)) {
1539                 if (!(c = strdup(p)))
1540                         return -ENOMEM;
1541         } else {
1542                 if (!(cwd = get_current_dir_name()))
1543                         return -errno;
1544
1545                 r = asprintf(&c, "%s/%s", cwd, p);
1546                 free(cwd);
1547
1548                 if (r < 0)
1549                         return -ENOMEM;
1550         }
1551
1552         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1553                 r = -errno;
1554                 free(c);
1555                 return r;
1556         }
1557
1558         return 0;
1559 }
1560
1561 char *unit_dbus_path(Unit *u) {
1562         char *p, *e;
1563
1564         assert(u);
1565
1566         if (!u->meta.id)
1567                 return NULL;
1568
1569         if (!(e = bus_path_escape(u->meta.id)))
1570                 return NULL;
1571
1572         p = strappend("/org/freedesktop/systemd1/unit/", e);
1573         free(e);
1574
1575         return p;
1576 }
1577
1578 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1579         CGroupBonding *l;
1580         int r;
1581
1582         assert(u);
1583         assert(b);
1584
1585         assert(b->path);
1586
1587         if (!b->controller)
1588                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1589                         return -ENOMEM;
1590
1591         /* Ensure this hasn't been added yet */
1592         assert(!b->unit);
1593
1594         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1595         LIST_PREPEND(CGroupBonding, by_path, l, b);
1596
1597         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1598                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1599                 return r;
1600         }
1601
1602         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1603         b->unit = u;
1604
1605         return 0;
1606 }
1607
1608 static char *default_cgroup_path(Unit *u) {
1609         char *p;
1610         int r;
1611
1612         assert(u);
1613
1614         if (u->meta.instance) {
1615                 char *t;
1616
1617                 if (!(t = unit_name_template(u->meta.id)))
1618                         return NULL;
1619
1620                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1621                 free(t);
1622         } else
1623                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1624
1625         return r < 0 ? NULL : p;
1626 }
1627
1628 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1629         char *controller = NULL, *path = NULL;
1630         CGroupBonding *b = NULL;
1631         int r;
1632
1633         assert(u);
1634         assert(name);
1635
1636         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1637                 return r;
1638
1639         if (!path)
1640                 path = default_cgroup_path(u);
1641
1642         if (!controller)
1643                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1644
1645         if (!path || !controller) {
1646                 free(path);
1647                 free(controller);
1648
1649                 return -ENOMEM;
1650         }
1651
1652         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1653                 r = -EEXIST;
1654                 goto fail;
1655         }
1656
1657         if (!(b = new0(CGroupBonding, 1))) {
1658                 r = -ENOMEM;
1659                 goto fail;
1660         }
1661
1662         b->controller = controller;
1663         b->path = path;
1664         b->only_us = false;
1665         b->clean_up = false;
1666
1667         if ((r = unit_add_cgroup(u, b)) < 0)
1668                 goto fail;
1669
1670         return 0;
1671
1672 fail:
1673         free(path);
1674         free(controller);
1675         free(b);
1676
1677         return r;
1678 }
1679
1680 int unit_add_default_cgroup(Unit *u) {
1681         CGroupBonding *b;
1682         int r = -ENOMEM;
1683
1684         assert(u);
1685
1686         /* Adds in the default cgroup data, if it wasn't specified yet */
1687
1688         if (unit_get_default_cgroup(u))
1689                 return 0;
1690
1691         if (!(b = new0(CGroupBonding, 1)))
1692                 return -ENOMEM;
1693
1694         if (!(b->path = default_cgroup_path(u)))
1695                 goto fail;
1696
1697         b->clean_up = true;
1698         b->only_us = true;
1699
1700         if ((r = unit_add_cgroup(u, b)) < 0)
1701                 goto fail;
1702
1703         return 0;
1704
1705 fail:
1706         free(b->path);
1707         free(b->controller);
1708         free(b);
1709
1710         return r;
1711 }
1712
1713 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1714         assert(u);
1715
1716         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1717 }
1718
1719 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1720         char *t;
1721         int r;
1722
1723         assert(u);
1724         assert(type);
1725         assert(_found);
1726
1727         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1728                 return -ENOMEM;
1729
1730         assert(!unit_has_name(u, t));
1731
1732         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1733         free(t);
1734
1735         assert(r < 0 || *_found != u);
1736
1737         return r;
1738 }
1739
1740 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1741         Unit *found;
1742         char *t;
1743
1744         assert(u);
1745         assert(type);
1746         assert(_found);
1747
1748         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1749                 return -ENOMEM;
1750
1751         assert(!unit_has_name(u, t));
1752
1753         found = manager_get_unit(u->meta.manager, t);
1754         free(t);
1755
1756         if (!found)
1757                 return -ENOENT;
1758
1759         *_found = found;
1760         return 0;
1761 }
1762
1763 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1764         Unit *u = userdata;
1765         assert(u);
1766
1767         return unit_name_to_prefix_and_instance(u->meta.id);
1768 }
1769
1770 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1771         Unit *u = userdata;
1772         assert(u);
1773
1774         return unit_name_to_prefix(u->meta.id);
1775 }
1776
1777 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1778         Unit *u = userdata;
1779         char *p, *r;
1780
1781         assert(u);
1782
1783         if (!(p = unit_name_to_prefix(u->meta.id)))
1784                 return NULL;
1785
1786         r = unit_name_unescape(p);
1787         free(p);
1788
1789         return r;
1790 }
1791
1792 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1793         Unit *u = userdata;
1794         assert(u);
1795
1796         if (u->meta.instance)
1797                 return unit_name_unescape(u->meta.instance);
1798
1799         return strdup("");
1800 }
1801
1802 char *unit_name_printf(Unit *u, const char* format) {
1803
1804         /*
1805          * This will use the passed string as format string and
1806          * replace the following specifiers:
1807          *
1808          * %n: the full id of the unit                 (foo@bar.waldo)
1809          * %N: the id of the unit without the suffix   (foo@bar)
1810          * %p: the prefix                              (foo)
1811          * %i: the instance                            (bar)
1812          */
1813
1814         const Specifier table[] = {
1815                 { 'n', specifier_string,              u->meta.id },
1816                 { 'N', specifier_prefix_and_instance, NULL },
1817                 { 'p', specifier_prefix,              NULL },
1818                 { 'i', specifier_string,              u->meta.instance },
1819                 { 0, NULL, NULL }
1820         };
1821
1822         assert(u);
1823         assert(format);
1824
1825         return specifier_printf(format, table, u);
1826 }
1827
1828 char *unit_full_printf(Unit *u, const char *format) {
1829
1830         /* This is similar to unit_name_printf() but also supports
1831          * unescaping */
1832
1833         const Specifier table[] = {
1834                 { 'n', specifier_string,              u->meta.id },
1835                 { 'N', specifier_prefix_and_instance, NULL },
1836                 { 'p', specifier_prefix,              NULL },
1837                 { 'P', specifier_prefix_unescaped,    NULL },
1838                 { 'i', specifier_string,              u->meta.instance },
1839                 { 'I', specifier_instance_unescaped,  NULL },
1840                 { 0, NULL, NULL }
1841         };
1842
1843         assert(u);
1844         assert(format);
1845
1846         return specifier_printf(format, table, u);
1847 }
1848
1849 char **unit_full_printf_strv(Unit *u, char **l) {
1850         size_t n;
1851         char **r, **i, **j;
1852
1853         /* Applies unit_full_printf to every entry in l */
1854
1855         assert(u);
1856
1857         n = strv_length(l);
1858         if (!(r = new(char*, n+1)))
1859                 return NULL;
1860
1861         for (i = l, j = r; *i; i++, j++)
1862                 if (!(*j = unit_full_printf(u, *i)))
1863                         goto fail;
1864
1865         *j = NULL;
1866         return r;
1867
1868 fail:
1869         j--;
1870         while (j >= r)
1871                 free(*j);
1872
1873         free(r);
1874
1875         return NULL;
1876 }
1877
1878 int unit_watch_bus_name(Unit *u, const char *name) {
1879         assert(u);
1880         assert(name);
1881
1882         /* Watch a specific name on the bus. We only support one unit
1883          * watching each name for now. */
1884
1885         return hashmap_put(u->meta.manager->watch_bus, name, u);
1886 }
1887
1888 void unit_unwatch_bus_name(Unit *u, const char *name) {
1889         assert(u);
1890         assert(name);
1891
1892         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1893 }
1894
1895 bool unit_can_serialize(Unit *u) {
1896         assert(u);
1897
1898         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1899 }
1900
1901 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1902         int r;
1903
1904         assert(u);
1905         assert(f);
1906         assert(fds);
1907
1908         if (!unit_can_serialize(u))
1909                 return 0;
1910
1911         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1912                 return r;
1913
1914         if (u->meta.job)
1915                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1916
1917         /* End marker */
1918         fputc('\n', f);
1919         return 0;
1920 }
1921
1922 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1923         va_list ap;
1924
1925         assert(u);
1926         assert(f);
1927         assert(key);
1928         assert(format);
1929
1930         fputs(key, f);
1931         fputc('=', f);
1932
1933         va_start(ap, format);
1934         vfprintf(f, format, ap);
1935         va_end(ap);
1936
1937         fputc('\n', f);
1938 }
1939
1940 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1941         assert(u);
1942         assert(f);
1943         assert(key);
1944         assert(value);
1945
1946         fprintf(f, "%s=%s\n", key, value);
1947 }
1948
1949 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1950         int r;
1951
1952         assert(u);
1953         assert(f);
1954         assert(fds);
1955
1956         if (!unit_can_serialize(u))
1957                 return 0;
1958
1959         for (;;) {
1960                 char line[1024], *l, *v;
1961                 size_t k;
1962
1963                 if (!fgets(line, sizeof(line), f)) {
1964                         if (feof(f))
1965                                 return 0;
1966                         return -errno;
1967                 }
1968
1969                 l = strstrip(line);
1970
1971                 /* End marker */
1972                 if (l[0] == 0)
1973                         return 0;
1974
1975                 k = strcspn(l, "=");
1976
1977                 if (l[k] == '=') {
1978                         l[k] = 0;
1979                         v = l+k+1;
1980                 } else
1981                         v = l+k;
1982
1983                 if (streq(l, "job")) {
1984                         JobType type;
1985
1986                         if ((type = job_type_from_string(v)) < 0)
1987                                 log_debug("Failed to parse job type value %s", v);
1988                         else
1989                                 u->meta.deserialized_job = type;
1990
1991                         continue;
1992                 }
1993
1994                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1995                         return r;
1996         }
1997 }
1998
1999 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2000         Unit *device;
2001         char *e;
2002         int r;
2003
2004         assert(u);
2005
2006         if (!what)
2007                 return 0;
2008
2009         /* Adds in links to the device node that this unit is based on */
2010
2011         if (!is_device_path(what))
2012                 return 0;
2013
2014         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2015                 return -ENOMEM;
2016
2017         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2018         free(e);
2019
2020         if (r < 0)
2021                 return r;
2022
2023         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2024                 return r;
2025
2026         if (wants)
2027                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2028                         return r;
2029
2030         return 0;
2031 }
2032
2033 int unit_coldplug(Unit *u) {
2034         int r;
2035
2036         assert(u);
2037
2038         if (UNIT_VTABLE(u)->coldplug)
2039                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2040                         return r;
2041
2042         if (u->meta.deserialized_job >= 0) {
2043                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2044                         return r;
2045
2046                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2047         }
2048
2049         return 0;
2050 }
2051
2052 void unit_status_printf(Unit *u, const char *format, ...) {
2053         va_list ap;
2054
2055         assert(u);
2056         assert(format);
2057
2058         if (!UNIT_VTABLE(u)->show_status)
2059                 return;
2060
2061         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2062                 return;
2063
2064         if (!u->meta.manager->show_status)
2065                 return;
2066
2067         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2068                 return;
2069
2070         va_start(ap, format);
2071         status_vprintf(format, ap);
2072         va_end(ap);
2073 }
2074
2075 bool unit_need_daemon_reload(Unit *u) {
2076         struct stat st;
2077
2078         assert(u);
2079
2080         if (!u->meta.fragment_path)
2081                 return false;
2082
2083         zero(st);
2084         if (stat(u->meta.fragment_path, &st) < 0)
2085                 /* What, cannot access this anymore? */
2086                 return true;
2087
2088         return
2089                 u->meta.fragment_mtime &&
2090                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2091 }
2092
2093 void unit_reset_maintenance(Unit *u) {
2094         assert(u);
2095
2096         if (UNIT_VTABLE(u)->reset_maintenance)
2097                 UNIT_VTABLE(u)->reset_maintenance(u);
2098 }
2099
2100 Unit *unit_following(Unit *u) {
2101         assert(u);
2102
2103         if (UNIT_VTABLE(u)->following)
2104                 return UNIT_VTABLE(u)->following(u);
2105
2106         return NULL;
2107 }
2108
2109 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
2110         [UNIT_SERVICE] = "service",
2111         [UNIT_TIMER] = "timer",
2112         [UNIT_SOCKET] = "socket",
2113         [UNIT_TARGET] = "target",
2114         [UNIT_DEVICE] = "device",
2115         [UNIT_MOUNT] = "mount",
2116         [UNIT_AUTOMOUNT] = "automount",
2117         [UNIT_SNAPSHOT] = "snapshot",
2118         [UNIT_SWAP] = "swap"
2119 };
2120
2121 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
2122
2123 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2124         [UNIT_STUB] = "stub",
2125         [UNIT_LOADED] = "loaded",
2126         [UNIT_FAILED] = "failed",
2127         [UNIT_MERGED] = "merged"
2128 };
2129
2130 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2131
2132 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2133         [UNIT_ACTIVE] = "active",
2134         [UNIT_RELOADING] = "reloading",
2135         [UNIT_INACTIVE] = "inactive",
2136         [UNIT_MAINTENANCE] = "maintenance",
2137         [UNIT_ACTIVATING] = "activating",
2138         [UNIT_DEACTIVATING] = "deactivating"
2139 };
2140
2141 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2142
2143 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2144         [UNIT_REQUIRES] = "Requires",
2145         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2146         [UNIT_WANTS] = "Wants",
2147         [UNIT_REQUISITE] = "Requisite",
2148         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2149         [UNIT_REQUIRED_BY] = "RequiredBy",
2150         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2151         [UNIT_WANTED_BY] = "WantedBy",
2152         [UNIT_CONFLICTS] = "Conflicts",
2153         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2154         [UNIT_BEFORE] = "Before",
2155         [UNIT_AFTER] = "After",
2156         [UNIT_REFERENCES] = "References",
2157         [UNIT_REFERENCED_BY] = "ReferencedBy",
2158         [UNIT_ON_FAILURE] = "OnFailure"
2159 };
2160
2161 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2162
2163 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2164         [KILL_CONTROL_GROUP] = "control-group",
2165         [KILL_PROCESS_GROUP] = "process-group",
2166         [KILL_PROCESS] = "process",
2167         [KILL_NONE] = "none"
2168 };
2169
2170 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);