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
1038                                 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1039                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_MAINTENANCE);
1040                         }
1041
1042                         break;
1043
1044                 case JOB_RELOAD:
1045                 case JOB_RELOAD_OR_START:
1046
1047                         if (u->meta.job->state == JOB_RUNNING) {
1048                                 if (ns == UNIT_ACTIVE)
1049                                         job_finish_and_invalidate(u->meta.job, true);
1050                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1051                                         unexpected = true;
1052
1053                                         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1054                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_MAINTENANCE);
1055                                 }
1056                         }
1057
1058                         break;
1059
1060                 case JOB_STOP:
1061                 case JOB_RESTART:
1062                 case JOB_TRY_RESTART:
1063
1064                         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1065                                 job_finish_and_invalidate(u->meta.job, true);
1066                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1067                                 unexpected = true;
1068                                 job_finish_and_invalidate(u->meta.job, false);
1069                         }
1070
1071                         break;
1072
1073                 default:
1074                         assert_not_reached("Job type unknown");
1075                 }
1076
1077         } else
1078                 unexpected = true;
1079
1080         /* If this state change happened without being requested by a
1081          * job, then let's retroactively start or stop
1082          * dependencies. We skip that step when deserializing, since
1083          * we don't want to create any additional jobs just because
1084          * something is already activated. */
1085
1086         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1087                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1088                         retroactively_start_dependencies(u);
1089                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1090                         retroactively_stop_dependencies(u);
1091         }
1092
1093         if (ns != os && ns == UNIT_MAINTENANCE) {
1094                 Iterator i;
1095                 Unit *other;
1096
1097                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1098                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1099
1100                 log_notice("Unit %s entered maintenance state.", u->meta.id);
1101         }
1102
1103         /* Some names are special */
1104         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1105                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1106                         /* The bus just might have become available,
1107                          * hence try to connect to it, if we aren't
1108                          * yet connected. */
1109                         bus_init(u->meta.manager);
1110
1111                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1112                         /* The syslog daemon just might have become
1113                          * available, hence try to connect to it, if
1114                          * we aren't yet connected. */
1115                         log_open();
1116
1117                 if (u->meta.type == UNIT_SERVICE &&
1118                     !UNIT_IS_ACTIVE_OR_RELOADING(os))
1119                         /* Write audit record if we have just finished starting up */
1120                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1121
1122         } else {
1123
1124                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1125                         /* The syslog daemon might just have
1126                          * terminated, hence try to disconnect from
1127                          * it. */
1128                         log_close_syslog();
1129
1130                 /* We don't care about D-Bus here, since we'll get an
1131                  * asynchronous notification for it anyway. */
1132
1133                 if (u->meta.type == UNIT_SERVICE &&
1134                     UNIT_IS_INACTIVE_OR_MAINTENANCE(ns) &&
1135                     !UNIT_IS_INACTIVE_OR_MAINTENANCE(os))
1136
1137                         /* Write audit record if we have just finished shutting down */
1138                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1139         }
1140
1141         /* Maybe we finished startup and are now ready for being
1142          * stopped because unneeded? */
1143         unit_check_uneeded(u);
1144
1145         unit_add_to_dbus_queue(u);
1146         unit_add_to_gc_queue(u);
1147 }
1148
1149 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1150         struct epoll_event ev;
1151
1152         assert(u);
1153         assert(fd >= 0);
1154         assert(w);
1155         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1156
1157         zero(ev);
1158         ev.data.ptr = w;
1159         ev.events = events;
1160
1161         if (epoll_ctl(u->meta.manager->epoll_fd,
1162                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1163                       fd,
1164                       &ev) < 0)
1165                 return -errno;
1166
1167         w->fd = fd;
1168         w->type = WATCH_FD;
1169         w->data.unit = u;
1170
1171         return 0;
1172 }
1173
1174 void unit_unwatch_fd(Unit *u, Watch *w) {
1175         assert(u);
1176         assert(w);
1177
1178         if (w->type == WATCH_INVALID)
1179                 return;
1180
1181         assert(w->type == WATCH_FD);
1182         assert(w->data.unit == u);
1183         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1184
1185         w->fd = -1;
1186         w->type = WATCH_INVALID;
1187         w->data.unit = NULL;
1188 }
1189
1190 int unit_watch_pid(Unit *u, pid_t pid) {
1191         assert(u);
1192         assert(pid >= 1);
1193
1194         /* Watch a specific PID. We only support one unit watching
1195          * each PID for now. */
1196
1197         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1198 }
1199
1200 void unit_unwatch_pid(Unit *u, pid_t pid) {
1201         assert(u);
1202         assert(pid >= 1);
1203
1204         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1205 }
1206
1207 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1208         struct itimerspec its;
1209         int flags, fd;
1210         bool ours;
1211
1212         assert(u);
1213         assert(w);
1214         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1215
1216         /* This will try to reuse the old timer if there is one */
1217
1218         if (w->type == WATCH_UNIT_TIMER) {
1219                 assert(w->data.unit == u);
1220                 assert(w->fd >= 0);
1221
1222                 ours = false;
1223                 fd = w->fd;
1224         } else if (w->type == WATCH_INVALID) {
1225
1226                 ours = true;
1227                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1228                         return -errno;
1229         } else
1230                 assert_not_reached("Invalid watch type");
1231
1232         zero(its);
1233
1234         if (delay <= 0) {
1235                 /* Set absolute time in the past, but not 0, since we
1236                  * don't want to disarm the timer */
1237                 its.it_value.tv_sec = 0;
1238                 its.it_value.tv_nsec = 1;
1239
1240                 flags = TFD_TIMER_ABSTIME;
1241         } else {
1242                 timespec_store(&its.it_value, delay);
1243                 flags = 0;
1244         }
1245
1246         /* This will also flush the elapse counter */
1247         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1248                 goto fail;
1249
1250         if (w->type == WATCH_INVALID) {
1251                 struct epoll_event ev;
1252
1253                 zero(ev);
1254                 ev.data.ptr = w;
1255                 ev.events = EPOLLIN;
1256
1257                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1258                         goto fail;
1259         }
1260
1261         w->type = WATCH_UNIT_TIMER;
1262         w->fd = fd;
1263         w->data.unit = u;
1264
1265         return 0;
1266
1267 fail:
1268         if (ours)
1269                 close_nointr_nofail(fd);
1270
1271         return -errno;
1272 }
1273
1274 void unit_unwatch_timer(Unit *u, Watch *w) {
1275         assert(u);
1276         assert(w);
1277
1278         if (w->type == WATCH_INVALID)
1279                 return;
1280
1281         assert(w->type == WATCH_UNIT_TIMER);
1282         assert(w->data.unit == u);
1283         assert(w->fd >= 0);
1284
1285         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1286         close_nointr_nofail(w->fd);
1287
1288         w->fd = -1;
1289         w->type = WATCH_INVALID;
1290         w->data.unit = NULL;
1291 }
1292
1293 bool unit_job_is_applicable(Unit *u, JobType j) {
1294         assert(u);
1295         assert(j >= 0 && j < _JOB_TYPE_MAX);
1296
1297         switch (j) {
1298
1299         case JOB_VERIFY_ACTIVE:
1300         case JOB_START:
1301                 return true;
1302
1303         case JOB_STOP:
1304         case JOB_RESTART:
1305         case JOB_TRY_RESTART:
1306                 return unit_can_start(u);
1307
1308         case JOB_RELOAD:
1309                 return unit_can_reload(u);
1310
1311         case JOB_RELOAD_OR_START:
1312                 return unit_can_reload(u) && unit_can_start(u);
1313
1314         default:
1315                 assert_not_reached("Invalid job type");
1316         }
1317 }
1318
1319 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1320
1321         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1322                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1323                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1324                 [UNIT_WANTS] = UNIT_WANTED_BY,
1325                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1326                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1327                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1328                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1329                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1330                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1331                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1332                 [UNIT_BEFORE] = UNIT_AFTER,
1333                 [UNIT_AFTER] = UNIT_BEFORE,
1334                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1335                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1336                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1337         };
1338         int r, q = 0, v = 0, w = 0;
1339
1340         assert(u);
1341         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1342         assert(other);
1343
1344         /* We won't allow dependencies on ourselves. We will not
1345          * consider them an error however. */
1346         if (u == other)
1347                 return 0;
1348
1349         if (UNIT_VTABLE(u)->no_requires &&
1350             (d == UNIT_REQUIRES ||
1351              d == UNIT_REQUIRES_OVERRIDABLE ||
1352              d == UNIT_REQUISITE ||
1353              d == UNIT_REQUISITE_OVERRIDABLE)) {
1354                     return -EINVAL;
1355         }
1356
1357         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1358                 return r;
1359
1360         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1361                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1362                         return r;
1363
1364         if (add_reference)
1365                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1366                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1367                         return r;
1368
1369         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1370                 return q;
1371
1372         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1373                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1374                         r = v;
1375                         goto fail;
1376                 }
1377
1378         if (add_reference) {
1379                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1380                         r = w;
1381                         goto fail;
1382                 }
1383
1384                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1385                         goto fail;
1386         }
1387
1388         unit_add_to_dbus_queue(u);
1389         return 0;
1390
1391 fail:
1392         if (q > 0)
1393                 set_remove(u->meta.dependencies[d], other);
1394
1395         if (v > 0)
1396                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1397
1398         if (w > 0)
1399                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1400
1401         return r;
1402 }
1403
1404 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1405         int r;
1406
1407         assert(u);
1408
1409         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1410                 return r;
1411
1412         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1413                 return r;
1414
1415         return 0;
1416 }
1417
1418 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1419         char *s;
1420
1421         assert(u);
1422         assert(name || path);
1423
1424         if (!name)
1425                 name = file_name_from_path(path);
1426
1427         if (!unit_name_is_template(name)) {
1428                 *p = NULL;
1429                 return name;
1430         }
1431
1432         if (u->meta.instance)
1433                 s = unit_name_replace_instance(name, u->meta.instance);
1434         else {
1435                 char *i;
1436
1437                 if (!(i = unit_name_to_prefix(u->meta.id)))
1438                         return NULL;
1439
1440                 s = unit_name_replace_instance(name, i);
1441                 free(i);
1442         }
1443
1444         if (!s)
1445                 return NULL;
1446
1447         *p = s;
1448         return s;
1449 }
1450
1451 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1452         Unit *other;
1453         int r;
1454         char *s;
1455
1456         assert(u);
1457         assert(name || path);
1458
1459         if (!(name = resolve_template(u, name, path, &s)))
1460                 return -ENOMEM;
1461
1462         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1463                 goto finish;
1464
1465         r = unit_add_dependency(u, d, other, add_reference);
1466
1467 finish:
1468         free(s);
1469         return r;
1470 }
1471
1472 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1473         Unit *other;
1474         int r;
1475         char *s;
1476
1477         assert(u);
1478         assert(name || path);
1479
1480         if (!(name = resolve_template(u, name, path, &s)))
1481                 return -ENOMEM;
1482
1483         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1484                 goto finish;
1485
1486         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1487
1488 finish:
1489         free(s);
1490         return r;
1491 }
1492
1493 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1494         Unit *other;
1495         int r;
1496         char *s;
1497
1498         assert(u);
1499         assert(name || path);
1500
1501         if (!(name = resolve_template(u, name, path, &s)))
1502                 return -ENOMEM;
1503
1504         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1505                 goto finish;
1506
1507         r = unit_add_dependency(other, d, u, add_reference);
1508
1509 finish:
1510         free(s);
1511         return r;
1512 }
1513
1514 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1515         Unit *other;
1516         int r;
1517         char *s;
1518
1519         assert(u);
1520         assert(name || path);
1521
1522         if (!(name = resolve_template(u, name, path, &s)))
1523                 return -ENOMEM;
1524
1525         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1526                 goto finish;
1527
1528         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1529                 goto finish;
1530
1531 finish:
1532         free(s);
1533         return r;
1534 }
1535
1536 int set_unit_path(const char *p) {
1537         char *cwd, *c;
1538         int r;
1539
1540         /* This is mostly for debug purposes */
1541
1542         if (path_is_absolute(p)) {
1543                 if (!(c = strdup(p)))
1544                         return -ENOMEM;
1545         } else {
1546                 if (!(cwd = get_current_dir_name()))
1547                         return -errno;
1548
1549                 r = asprintf(&c, "%s/%s", cwd, p);
1550                 free(cwd);
1551
1552                 if (r < 0)
1553                         return -ENOMEM;
1554         }
1555
1556         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1557                 r = -errno;
1558                 free(c);
1559                 return r;
1560         }
1561
1562         return 0;
1563 }
1564
1565 char *unit_dbus_path(Unit *u) {
1566         char *p, *e;
1567
1568         assert(u);
1569
1570         if (!u->meta.id)
1571                 return NULL;
1572
1573         if (!(e = bus_path_escape(u->meta.id)))
1574                 return NULL;
1575
1576         p = strappend("/org/freedesktop/systemd1/unit/", e);
1577         free(e);
1578
1579         return p;
1580 }
1581
1582 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1583         CGroupBonding *l;
1584         int r;
1585
1586         assert(u);
1587         assert(b);
1588
1589         assert(b->path);
1590
1591         if (!b->controller)
1592                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1593                         return -ENOMEM;
1594
1595         /* Ensure this hasn't been added yet */
1596         assert(!b->unit);
1597
1598         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1599         LIST_PREPEND(CGroupBonding, by_path, l, b);
1600
1601         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1602                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1603                 return r;
1604         }
1605
1606         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1607         b->unit = u;
1608
1609         return 0;
1610 }
1611
1612 static char *default_cgroup_path(Unit *u) {
1613         char *p;
1614         int r;
1615
1616         assert(u);
1617
1618         if (u->meta.instance) {
1619                 char *t;
1620
1621                 if (!(t = unit_name_template(u->meta.id)))
1622                         return NULL;
1623
1624                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1625                 free(t);
1626         } else
1627                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1628
1629         return r < 0 ? NULL : p;
1630 }
1631
1632 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1633         char *controller = NULL, *path = NULL;
1634         CGroupBonding *b = NULL;
1635         int r;
1636
1637         assert(u);
1638         assert(name);
1639
1640         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1641                 return r;
1642
1643         if (!path)
1644                 path = default_cgroup_path(u);
1645
1646         if (!controller)
1647                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1648
1649         if (!path || !controller) {
1650                 free(path);
1651                 free(controller);
1652
1653                 return -ENOMEM;
1654         }
1655
1656         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1657                 r = -EEXIST;
1658                 goto fail;
1659         }
1660
1661         if (!(b = new0(CGroupBonding, 1))) {
1662                 r = -ENOMEM;
1663                 goto fail;
1664         }
1665
1666         b->controller = controller;
1667         b->path = path;
1668         b->only_us = false;
1669         b->clean_up = false;
1670
1671         if ((r = unit_add_cgroup(u, b)) < 0)
1672                 goto fail;
1673
1674         return 0;
1675
1676 fail:
1677         free(path);
1678         free(controller);
1679         free(b);
1680
1681         return r;
1682 }
1683
1684 int unit_add_default_cgroup(Unit *u) {
1685         CGroupBonding *b;
1686         int r = -ENOMEM;
1687
1688         assert(u);
1689
1690         /* Adds in the default cgroup data, if it wasn't specified yet */
1691
1692         if (unit_get_default_cgroup(u))
1693                 return 0;
1694
1695         if (!(b = new0(CGroupBonding, 1)))
1696                 return -ENOMEM;
1697
1698         if (!(b->path = default_cgroup_path(u)))
1699                 goto fail;
1700
1701         b->clean_up = true;
1702         b->only_us = true;
1703
1704         if ((r = unit_add_cgroup(u, b)) < 0)
1705                 goto fail;
1706
1707         return 0;
1708
1709 fail:
1710         free(b->path);
1711         free(b->controller);
1712         free(b);
1713
1714         return r;
1715 }
1716
1717 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1718         assert(u);
1719
1720         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1721 }
1722
1723 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1724         char *t;
1725         int r;
1726
1727         assert(u);
1728         assert(type);
1729         assert(_found);
1730
1731         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1732                 return -ENOMEM;
1733
1734         assert(!unit_has_name(u, t));
1735
1736         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1737         free(t);
1738
1739         assert(r < 0 || *_found != u);
1740
1741         return r;
1742 }
1743
1744 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1745         Unit *found;
1746         char *t;
1747
1748         assert(u);
1749         assert(type);
1750         assert(_found);
1751
1752         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1753                 return -ENOMEM;
1754
1755         assert(!unit_has_name(u, t));
1756
1757         found = manager_get_unit(u->meta.manager, t);
1758         free(t);
1759
1760         if (!found)
1761                 return -ENOENT;
1762
1763         *_found = found;
1764         return 0;
1765 }
1766
1767 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1768         Unit *u = userdata;
1769         assert(u);
1770
1771         return unit_name_to_prefix_and_instance(u->meta.id);
1772 }
1773
1774 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1775         Unit *u = userdata;
1776         assert(u);
1777
1778         return unit_name_to_prefix(u->meta.id);
1779 }
1780
1781 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1782         Unit *u = userdata;
1783         char *p, *r;
1784
1785         assert(u);
1786
1787         if (!(p = unit_name_to_prefix(u->meta.id)))
1788                 return NULL;
1789
1790         r = unit_name_unescape(p);
1791         free(p);
1792
1793         return r;
1794 }
1795
1796 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1797         Unit *u = userdata;
1798         assert(u);
1799
1800         if (u->meta.instance)
1801                 return unit_name_unescape(u->meta.instance);
1802
1803         return strdup("");
1804 }
1805
1806 char *unit_name_printf(Unit *u, const char* format) {
1807
1808         /*
1809          * This will use the passed string as format string and
1810          * replace the following specifiers:
1811          *
1812          * %n: the full id of the unit                 (foo@bar.waldo)
1813          * %N: the id of the unit without the suffix   (foo@bar)
1814          * %p: the prefix                              (foo)
1815          * %i: the instance                            (bar)
1816          */
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                 { 'i', specifier_string,              u->meta.instance },
1823                 { 0, NULL, NULL }
1824         };
1825
1826         assert(u);
1827         assert(format);
1828
1829         return specifier_printf(format, table, u);
1830 }
1831
1832 char *unit_full_printf(Unit *u, const char *format) {
1833
1834         /* This is similar to unit_name_printf() but also supports
1835          * unescaping */
1836
1837         const Specifier table[] = {
1838                 { 'n', specifier_string,              u->meta.id },
1839                 { 'N', specifier_prefix_and_instance, NULL },
1840                 { 'p', specifier_prefix,              NULL },
1841                 { 'P', specifier_prefix_unescaped,    NULL },
1842                 { 'i', specifier_string,              u->meta.instance },
1843                 { 'I', specifier_instance_unescaped,  NULL },
1844                 { 0, NULL, NULL }
1845         };
1846
1847         assert(u);
1848         assert(format);
1849
1850         return specifier_printf(format, table, u);
1851 }
1852
1853 char **unit_full_printf_strv(Unit *u, char **l) {
1854         size_t n;
1855         char **r, **i, **j;
1856
1857         /* Applies unit_full_printf to every entry in l */
1858
1859         assert(u);
1860
1861         n = strv_length(l);
1862         if (!(r = new(char*, n+1)))
1863                 return NULL;
1864
1865         for (i = l, j = r; *i; i++, j++)
1866                 if (!(*j = unit_full_printf(u, *i)))
1867                         goto fail;
1868
1869         *j = NULL;
1870         return r;
1871
1872 fail:
1873         j--;
1874         while (j >= r)
1875                 free(*j);
1876
1877         free(r);
1878
1879         return NULL;
1880 }
1881
1882 int unit_watch_bus_name(Unit *u, const char *name) {
1883         assert(u);
1884         assert(name);
1885
1886         /* Watch a specific name on the bus. We only support one unit
1887          * watching each name for now. */
1888
1889         return hashmap_put(u->meta.manager->watch_bus, name, u);
1890 }
1891
1892 void unit_unwatch_bus_name(Unit *u, const char *name) {
1893         assert(u);
1894         assert(name);
1895
1896         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1897 }
1898
1899 bool unit_can_serialize(Unit *u) {
1900         assert(u);
1901
1902         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1903 }
1904
1905 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1906         int r;
1907
1908         assert(u);
1909         assert(f);
1910         assert(fds);
1911
1912         if (!unit_can_serialize(u))
1913                 return 0;
1914
1915         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1916                 return r;
1917
1918         if (u->meta.job)
1919                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1920
1921         /* End marker */
1922         fputc('\n', f);
1923         return 0;
1924 }
1925
1926 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1927         va_list ap;
1928
1929         assert(u);
1930         assert(f);
1931         assert(key);
1932         assert(format);
1933
1934         fputs(key, f);
1935         fputc('=', f);
1936
1937         va_start(ap, format);
1938         vfprintf(f, format, ap);
1939         va_end(ap);
1940
1941         fputc('\n', f);
1942 }
1943
1944 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1945         assert(u);
1946         assert(f);
1947         assert(key);
1948         assert(value);
1949
1950         fprintf(f, "%s=%s\n", key, value);
1951 }
1952
1953 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1954         int r;
1955
1956         assert(u);
1957         assert(f);
1958         assert(fds);
1959
1960         if (!unit_can_serialize(u))
1961                 return 0;
1962
1963         for (;;) {
1964                 char line[1024], *l, *v;
1965                 size_t k;
1966
1967                 if (!fgets(line, sizeof(line), f)) {
1968                         if (feof(f))
1969                                 return 0;
1970                         return -errno;
1971                 }
1972
1973                 l = strstrip(line);
1974
1975                 /* End marker */
1976                 if (l[0] == 0)
1977                         return 0;
1978
1979                 k = strcspn(l, "=");
1980
1981                 if (l[k] == '=') {
1982                         l[k] = 0;
1983                         v = l+k+1;
1984                 } else
1985                         v = l+k;
1986
1987                 if (streq(l, "job")) {
1988                         JobType type;
1989
1990                         if ((type = job_type_from_string(v)) < 0)
1991                                 log_debug("Failed to parse job type value %s", v);
1992                         else
1993                                 u->meta.deserialized_job = type;
1994
1995                         continue;
1996                 }
1997
1998                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1999                         return r;
2000         }
2001 }
2002
2003 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2004         Unit *device;
2005         char *e;
2006         int r;
2007
2008         assert(u);
2009
2010         if (!what)
2011                 return 0;
2012
2013         /* Adds in links to the device node that this unit is based on */
2014
2015         if (!is_device_path(what))
2016                 return 0;
2017
2018         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2019                 return -ENOMEM;
2020
2021         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2022         free(e);
2023
2024         if (r < 0)
2025                 return r;
2026
2027         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2028                 return r;
2029
2030         if (wants)
2031                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2032                         return r;
2033
2034         return 0;
2035 }
2036
2037 int unit_coldplug(Unit *u) {
2038         int r;
2039
2040         assert(u);
2041
2042         if (UNIT_VTABLE(u)->coldplug)
2043                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2044                         return r;
2045
2046         if (u->meta.deserialized_job >= 0) {
2047                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2048                         return r;
2049
2050                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2051         }
2052
2053         return 0;
2054 }
2055
2056 void unit_status_printf(Unit *u, const char *format, ...) {
2057         va_list ap;
2058
2059         assert(u);
2060         assert(format);
2061
2062         if (!UNIT_VTABLE(u)->show_status)
2063                 return;
2064
2065         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2066                 return;
2067
2068         if (!u->meta.manager->show_status)
2069                 return;
2070
2071         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2072                 return;
2073
2074         va_start(ap, format);
2075         status_vprintf(format, ap);
2076         va_end(ap);
2077 }
2078
2079 bool unit_need_daemon_reload(Unit *u) {
2080         struct stat st;
2081
2082         assert(u);
2083
2084         if (!u->meta.fragment_path)
2085                 return false;
2086
2087         zero(st);
2088         if (stat(u->meta.fragment_path, &st) < 0)
2089                 /* What, cannot access this anymore? */
2090                 return true;
2091
2092         return
2093                 u->meta.fragment_mtime &&
2094                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2095 }
2096
2097 void unit_reset_maintenance(Unit *u) {
2098         assert(u);
2099
2100         if (UNIT_VTABLE(u)->reset_maintenance)
2101                 UNIT_VTABLE(u)->reset_maintenance(u);
2102 }
2103
2104 Unit *unit_following(Unit *u) {
2105         assert(u);
2106
2107         if (UNIT_VTABLE(u)->following)
2108                 return UNIT_VTABLE(u)->following(u);
2109
2110         return NULL;
2111 }
2112
2113 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
2114         [UNIT_SERVICE] = "service",
2115         [UNIT_TIMER] = "timer",
2116         [UNIT_SOCKET] = "socket",
2117         [UNIT_TARGET] = "target",
2118         [UNIT_DEVICE] = "device",
2119         [UNIT_MOUNT] = "mount",
2120         [UNIT_AUTOMOUNT] = "automount",
2121         [UNIT_SNAPSHOT] = "snapshot",
2122         [UNIT_SWAP] = "swap"
2123 };
2124
2125 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
2126
2127 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2128         [UNIT_STUB] = "stub",
2129         [UNIT_LOADED] = "loaded",
2130         [UNIT_FAILED] = "failed",
2131         [UNIT_MERGED] = "merged"
2132 };
2133
2134 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2135
2136 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2137         [UNIT_ACTIVE] = "active",
2138         [UNIT_RELOADING] = "reloading",
2139         [UNIT_INACTIVE] = "inactive",
2140         [UNIT_MAINTENANCE] = "maintenance",
2141         [UNIT_ACTIVATING] = "activating",
2142         [UNIT_DEACTIVATING] = "deactivating"
2143 };
2144
2145 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2146
2147 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2148         [UNIT_REQUIRES] = "Requires",
2149         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2150         [UNIT_WANTS] = "Wants",
2151         [UNIT_REQUISITE] = "Requisite",
2152         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2153         [UNIT_REQUIRED_BY] = "RequiredBy",
2154         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2155         [UNIT_WANTED_BY] = "WantedBy",
2156         [UNIT_CONFLICTS] = "Conflicts",
2157         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2158         [UNIT_BEFORE] = "Before",
2159         [UNIT_AFTER] = "After",
2160         [UNIT_REFERENCES] = "References",
2161         [UNIT_REFERENCED_BY] = "ReferencedBy",
2162         [UNIT_ON_FAILURE] = "OnFailure"
2163 };
2164
2165 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2166
2167 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2168         [KILL_CONTROL_GROUP] = "control-group",
2169         [KILL_PROCESS_GROUP] = "process-group",
2170         [KILL_PROCESS] = "process",
2171         [KILL_NONE] = "none"
2172 };
2173
2174 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);