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