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 int unit_load(Unit *u) {
 726         int r;
 727
 728         assert(u);
 729
 730         if (u->meta.in_load_queue) {
 731                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 732                 u->meta.in_load_queue = false;
 733         }
 734
 735         if (u->meta.type == _UNIT_TYPE_INVALID)
 736                 return -EINVAL;
 737
 738         if (u->meta.load_state != UNIT_STUB)
 739                 return 0;
 740
 741         if (UNIT_VTABLE(u)->load)
 742                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 743                         goto fail;
 744
 745         if (u->meta.load_state == UNIT_STUB) {
 746                 r = -ENOENT;
 747                 goto fail;
 748         }
 749
 750         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 751
 752         unit_add_to_dbus_queue(unit_follow_merge(u));
 753         unit_add_to_gc_queue(u);
 754
 755         return 0;
 756
 757 fail:
 758         u->meta.load_state = UNIT_FAILED;
 759         unit_add_to_dbus_queue(u);
 760
 761         log_notice("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 762
 763         return r;
 764 }
 765
 766 /* Errors:
 767  *         -EBADR:     This unit type does not support starting.
 768  *         -EALREADY:  Unit is already started.
 769  *         -EAGAIN:    An operation is already in progress. Retry later.
 770  *         -ECANCELED: Too many requests for now.
 771  */
 772 int unit_start(Unit *u) {
 773         UnitActiveState state;
 774
 775         assert(u);
 776
 777         if (u->meta.load_state != UNIT_LOADED)
 778                 return -EINVAL;
 779
 780         /* If this is already (being) started, then this will
 781          * succeed. Note that this will even succeed if this unit is
 782          * not startable by the user. This is relied on to detect when
 783          * we need to wait for units and when waiting is finished. */
 784         state = unit_active_state(u);
 785         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 786                 return -EALREADY;
 787
 788         /* If it is stopped, but we cannot start it, then fail */
 789         if (!UNIT_VTABLE(u)->start)
 790                 return -EBADR;
 791
 792         /* We don't suppress calls to ->start() here when we are
 793          * already starting, to allow this request to be used as a
 794          * "hurry up" call, for example when the unit is in some "auto
 795          * restart" state where it waits for a holdoff timer to elapse
 796          * before it will start again. */
 797
 798         unit_add_to_dbus_queue(u);
 799
 800         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 801
 802         return UNIT_VTABLE(u)->start(u);
 803 }
 804
 805 bool unit_can_start(Unit *u) {
 806         assert(u);
 807
 808         return !!UNIT_VTABLE(u)->start;
 809 }
 810
 811 /* Errors:
 812  *         -EBADR:    This unit type does not support stopping.
 813  *         -EALREADY: Unit is already stopped.
 814  *         -EAGAIN:   An operation is already in progress. Retry later.
 815  */
 816 int unit_stop(Unit *u) {
 817         UnitActiveState state;
 818
 819         assert(u);
 820
 821         state = unit_active_state(u);
 822         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
 823                 return -EALREADY;
 824
 825         if (!UNIT_VTABLE(u)->stop)
 826                 return -EBADR;
 827
 828         unit_add_to_dbus_queue(u);
 829
 830         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 831
 832         return UNIT_VTABLE(u)->stop(u);
 833 }
 834
 835 /* Errors:
 836  *         -EBADR:    This unit type does not support reloading.
 837  *         -ENOEXEC:  Unit is not started.
 838  *         -EAGAIN:   An operation is already in progress. Retry later.
 839  */
 840 int unit_reload(Unit *u) {
 841         UnitActiveState state;
 842
 843         assert(u);
 844
 845         if (u->meta.load_state != UNIT_LOADED)
 846                 return -EINVAL;
 847
 848         if (!unit_can_reload(u))
 849                 return -EBADR;
 850
 851         state = unit_active_state(u);
 852         if (state == UNIT_RELOADING)
 853                 return -EALREADY;
 854
 855         if (state != UNIT_ACTIVE)
 856                 return -ENOEXEC;
 857
 858         unit_add_to_dbus_queue(u);
 859         return UNIT_VTABLE(u)->reload(u);
 860 }
 861
 862 bool unit_can_reload(Unit *u) {
 863         assert(u);
 864
 865         if (!UNIT_VTABLE(u)->reload)
 866                 return false;
 867
 868         if (!UNIT_VTABLE(u)->can_reload)
 869                 return true;
 870
 871         return UNIT_VTABLE(u)->can_reload(u);
 872 }
 873
 874 static void unit_check_uneeded(Unit *u) {
 875         Iterator i;
 876         Unit *other;
 877
 878         assert(u);
 879
 880         /* If this service shall be shut down when unneeded then do
 881          * so. */
 882
 883         if (!u->meta.stop_when_unneeded)
 884                 return;
 885
 886         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 887                 return;
 888
 889         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 890                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 891                         return;
 892
 893         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 894                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 895                         return;
 896
 897         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 898                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 899                         return;
 900
 901         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 902
 903         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 904         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 905 }
 906
 907 static void retroactively_start_dependencies(Unit *u) {
 908         Iterator i;
 909         Unit *other;
 910
 911         assert(u);
 912         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 913
 914         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 915                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 916                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 917
 918         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 919                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 920                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 921
 922         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 923                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 924                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 925
 926         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 927                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 928                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 929
 930         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 931                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 932                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 933
 934         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 935                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 936                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 937 }
 938
 939 static void retroactively_stop_dependencies(Unit *u) {
 940         Iterator i;
 941         Unit *other;
 942
 943         assert(u);
 944         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 945
 946         if (u->meta.recursive_stop) {
 947                 /* Pull down units need us recursively if enabled */
 948                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 949                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 950                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 951         }
 952
 953         /* Garbage collect services that might not be needed anymore, if enabled */
 954         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 955                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 956                         unit_check_uneeded(other);
 957         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 958                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 959                         unit_check_uneeded(other);
 960         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 961                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 962                         unit_check_uneeded(other);
 963         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 964                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 965                         unit_check_uneeded(other);
 966         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
 967                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 968                         unit_check_uneeded(other);
 969 }
 970
 971 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 972         dual_timestamp ts;
 973         bool unexpected;
 974
 975         assert(u);
 976         assert(os < _UNIT_ACTIVE_STATE_MAX);
 977         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 978
 979         /* Note that this is called for all low-level state changes,
 980          * even if they might map to the same high-level
 981          * UnitActiveState! That means that ns == os is OK an expected
 982          * behaviour here. For example: if a mount point is remounted
 983          * this function will be called too! */
 984
 985         dual_timestamp_get(&ts);
 986
 987         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 988                 u->meta.inactive_exit_timestamp = ts;
 989         else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 990                 u->meta.inactive_enter_timestamp = ts;
 991
 992         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 993                 u->meta.active_enter_timestamp = ts;
 994         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 995                 u->meta.active_exit_timestamp = ts;
 996
 997         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 998                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
 999
1000         timer_unit_notify(u, ns);
1001         path_unit_notify(u, ns);
1002
1003         if (u->meta.job) {
1004                 unexpected = false;
1005
1006                 if (u->meta.job->state == JOB_WAITING)
1007
1008                         /* So we reached a different state for this
1009                          * job. Let's see if we can run it now if it
1010                          * failed previously due to EAGAIN. */
1011                         job_add_to_run_queue(u->meta.job);
1012
1013                 /* Let's check whether this state change constitutes a
1014                  * finished job, or maybe cotradicts a running job and
1015                  * hence needs to invalidate jobs. */
1016
1017                 switch (u->meta.job->type) {
1018
1019                 case JOB_START:
1020                 case JOB_VERIFY_ACTIVE:
1021
1022                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1023                                 job_finish_and_invalidate(u->meta.job, true);
1024                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1025                                 unexpected = true;
1026
1027                                 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1028                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_MAINTENANCE);
1029                         }
1030
1031                         break;
1032
1033                 case JOB_RELOAD:
1034                 case JOB_RELOAD_OR_START:
1035
1036                         if (u->meta.job->state == JOB_RUNNING) {
1037                                 if (ns == UNIT_ACTIVE)
1038                                         job_finish_and_invalidate(u->meta.job, true);
1039                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1040                                         unexpected = true;
1041
1042                                         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1043                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_MAINTENANCE);
1044                                 }
1045                         }
1046
1047                         break;
1048
1049                 case JOB_STOP:
1050                 case JOB_RESTART:
1051                 case JOB_TRY_RESTART:
1052
1053                         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
1054                                 job_finish_and_invalidate(u->meta.job, true);
1055                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1056                                 unexpected = true;
1057                                 job_finish_and_invalidate(u->meta.job, false);
1058                         }
1059
1060                         break;
1061
1062                 default:
1063                         assert_not_reached("Job type unknown");
1064                 }
1065
1066         } else
1067                 unexpected = true;
1068
1069         /* If this state change happened without being requested by a
1070          * job, then let's retroactively start or stop
1071          * dependencies. We skip that step when deserializing, since
1072          * we don't want to create any additional jobs just because
1073          * something is already activated. */
1074
1075         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1076                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1077                         retroactively_start_dependencies(u);
1078                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1079                         retroactively_stop_dependencies(u);
1080         }
1081
1082         if (ns != os && ns == UNIT_MAINTENANCE) {
1083                 Iterator i;
1084                 Unit *other;
1085
1086                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1087                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1088
1089                 log_notice("Unit %s entered maintenance state.", u->meta.id);
1090         }
1091
1092         /* Some names are special */
1093         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1094                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1095                         /* The bus just might have become available,
1096                          * hence try to connect to it, if we aren't
1097                          * yet connected. */
1098                         bus_init(u->meta.manager);
1099
1100                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1101                         /* The syslog daemon just might have become
1102                          * available, hence try to connect to it, if
1103                          * we aren't yet connected. */
1104                         log_open();
1105
1106                 if (u->meta.type == UNIT_SERVICE &&
1107                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1108                         /* Write audit record if we have just finished starting up */
1109                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1110                         u->meta.in_audit = true;
1111                 }
1112
1113         } else {
1114
1115                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1116                         /* The syslog daemon might just have
1117                          * terminated, hence try to disconnect from
1118                          * it. */
1119                         log_close_syslog();
1120
1121                 /* We don't care about D-Bus here, since we'll get an
1122                  * asynchronous notification for it anyway. */
1123
1124                 if (u->meta.type == UNIT_SERVICE &&
1125                     UNIT_IS_INACTIVE_OR_MAINTENANCE(ns) &&
1126                     !UNIT_IS_INACTIVE_OR_MAINTENANCE(os)) {
1127
1128                         /* Hmm, if there was no start record written
1129                          * write it now, so that we always have a nice
1130                          * pair */
1131                         if (!u->meta.in_audit) {
1132                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1133
1134                                 if (ns == UNIT_INACTIVE)
1135                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1136                         } else
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                         u->meta.in_audit = false;
1141                 }
1142         }
1143
1144         /* Maybe we finished startup and are now ready for being
1145          * stopped because unneeded? */
1146         unit_check_uneeded(u);
1147
1148         unit_add_to_dbus_queue(u);
1149         unit_add_to_gc_queue(u);
1150 }
1151
1152 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1153         struct epoll_event ev;
1154
1155         assert(u);
1156         assert(fd >= 0);
1157         assert(w);
1158         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1159
1160         zero(ev);
1161         ev.data.ptr = w;
1162         ev.events = events;
1163
1164         if (epoll_ctl(u->meta.manager->epoll_fd,
1165                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1166                       fd,
1167                       &ev) < 0)
1168                 return -errno;
1169
1170         w->fd = fd;
1171         w->type = WATCH_FD;
1172         w->data.unit = u;
1173
1174         return 0;
1175 }
1176
1177 void unit_unwatch_fd(Unit *u, Watch *w) {
1178         assert(u);
1179         assert(w);
1180
1181         if (w->type == WATCH_INVALID)
1182                 return;
1183
1184         assert(w->type == WATCH_FD);
1185         assert(w->data.unit == u);
1186         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1187
1188         w->fd = -1;
1189         w->type = WATCH_INVALID;
1190         w->data.unit = NULL;
1191 }
1192
1193 int unit_watch_pid(Unit *u, pid_t pid) {
1194         assert(u);
1195         assert(pid >= 1);
1196
1197         /* Watch a specific PID. We only support one unit watching
1198          * each PID for now. */
1199
1200         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1201 }
1202
1203 void unit_unwatch_pid(Unit *u, pid_t pid) {
1204         assert(u);
1205         assert(pid >= 1);
1206
1207         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1208 }
1209
1210 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1211         struct itimerspec its;
1212         int flags, fd;
1213         bool ours;
1214
1215         assert(u);
1216         assert(w);
1217         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1218
1219         /* This will try to reuse the old timer if there is one */
1220
1221         if (w->type == WATCH_UNIT_TIMER) {
1222                 assert(w->data.unit == u);
1223                 assert(w->fd >= 0);
1224
1225                 ours = false;
1226                 fd = w->fd;
1227         } else if (w->type == WATCH_INVALID) {
1228
1229                 ours = true;
1230                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1231                         return -errno;
1232         } else
1233                 assert_not_reached("Invalid watch type");
1234
1235         zero(its);
1236
1237         if (delay <= 0) {
1238                 /* Set absolute time in the past, but not 0, since we
1239                  * don't want to disarm the timer */
1240                 its.it_value.tv_sec = 0;
1241                 its.it_value.tv_nsec = 1;
1242
1243                 flags = TFD_TIMER_ABSTIME;
1244         } else {
1245                 timespec_store(&its.it_value, delay);
1246                 flags = 0;
1247         }
1248
1249         /* This will also flush the elapse counter */
1250         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1251                 goto fail;
1252
1253         if (w->type == WATCH_INVALID) {
1254                 struct epoll_event ev;
1255
1256                 zero(ev);
1257                 ev.data.ptr = w;
1258                 ev.events = EPOLLIN;
1259
1260                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1261                         goto fail;
1262         }
1263
1264         w->type = WATCH_UNIT_TIMER;
1265         w->fd = fd;
1266         w->data.unit = u;
1267
1268         return 0;
1269
1270 fail:
1271         if (ours)
1272                 close_nointr_nofail(fd);
1273
1274         return -errno;
1275 }
1276
1277 void unit_unwatch_timer(Unit *u, Watch *w) {
1278         assert(u);
1279         assert(w);
1280
1281         if (w->type == WATCH_INVALID)
1282                 return;
1283
1284         assert(w->type == WATCH_UNIT_TIMER);
1285         assert(w->data.unit == u);
1286         assert(w->fd >= 0);
1287
1288         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1289         close_nointr_nofail(w->fd);
1290
1291         w->fd = -1;
1292         w->type = WATCH_INVALID;
1293         w->data.unit = NULL;
1294 }
1295
1296 bool unit_job_is_applicable(Unit *u, JobType j) {
1297         assert(u);
1298         assert(j >= 0 && j < _JOB_TYPE_MAX);
1299
1300         switch (j) {
1301
1302         case JOB_VERIFY_ACTIVE:
1303         case JOB_START:
1304                 return true;
1305
1306         case JOB_STOP:
1307         case JOB_RESTART:
1308         case JOB_TRY_RESTART:
1309                 return unit_can_start(u);
1310
1311         case JOB_RELOAD:
1312                 return unit_can_reload(u);
1313
1314         case JOB_RELOAD_OR_START:
1315                 return unit_can_reload(u) && unit_can_start(u);
1316
1317         default:
1318                 assert_not_reached("Invalid job type");
1319         }
1320 }
1321
1322 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1323
1324         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1325                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1326                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1327                 [UNIT_WANTS] = UNIT_WANTED_BY,
1328                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1329                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1330                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1331                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1332                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1333                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1334                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1335                 [UNIT_BEFORE] = UNIT_AFTER,
1336                 [UNIT_AFTER] = UNIT_BEFORE,
1337                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1338                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1339                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1340         };
1341         int r, q = 0, v = 0, w = 0;
1342
1343         assert(u);
1344         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1345         assert(other);
1346
1347         /* We won't allow dependencies on ourselves. We will not
1348          * consider them an error however. */
1349         if (u == other)
1350                 return 0;
1351
1352         if (UNIT_VTABLE(u)->no_requires &&
1353             (d == UNIT_REQUIRES ||
1354              d == UNIT_REQUIRES_OVERRIDABLE ||
1355              d == UNIT_REQUISITE ||
1356              d == UNIT_REQUISITE_OVERRIDABLE)) {
1357                     return -EINVAL;
1358         }
1359
1360         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1361                 return r;
1362
1363         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1364                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1365                         return r;
1366
1367         if (add_reference)
1368                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1369                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1370                         return r;
1371
1372         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1373                 return q;
1374
1375         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1376                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1377                         r = v;
1378                         goto fail;
1379                 }
1380
1381         if (add_reference) {
1382                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1383                         r = w;
1384                         goto fail;
1385                 }
1386
1387                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1388                         goto fail;
1389         }
1390
1391         unit_add_to_dbus_queue(u);
1392         return 0;
1393
1394 fail:
1395         if (q > 0)
1396                 set_remove(u->meta.dependencies[d], other);
1397
1398         if (v > 0)
1399                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1400
1401         if (w > 0)
1402                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1403
1404         return r;
1405 }
1406
1407 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1408         int r;
1409
1410         assert(u);
1411
1412         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1413                 return r;
1414
1415         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1416                 return r;
1417
1418         return 0;
1419 }
1420
1421 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1422         char *s;
1423
1424         assert(u);
1425         assert(name || path);
1426
1427         if (!name)
1428                 name = file_name_from_path(path);
1429
1430         if (!unit_name_is_template(name)) {
1431                 *p = NULL;
1432                 return name;
1433         }
1434
1435         if (u->meta.instance)
1436                 s = unit_name_replace_instance(name, u->meta.instance);
1437         else {
1438                 char *i;
1439
1440                 if (!(i = unit_name_to_prefix(u->meta.id)))
1441                         return NULL;
1442
1443                 s = unit_name_replace_instance(name, i);
1444                 free(i);
1445         }
1446
1447         if (!s)
1448                 return NULL;
1449
1450         *p = s;
1451         return s;
1452 }
1453
1454 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1455         Unit *other;
1456         int r;
1457         char *s;
1458
1459         assert(u);
1460         assert(name || path);
1461
1462         if (!(name = resolve_template(u, name, path, &s)))
1463                 return -ENOMEM;
1464
1465         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1466                 goto finish;
1467
1468         r = unit_add_dependency(u, d, other, add_reference);
1469
1470 finish:
1471         free(s);
1472         return r;
1473 }
1474
1475 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1476         Unit *other;
1477         int r;
1478         char *s;
1479
1480         assert(u);
1481         assert(name || path);
1482
1483         if (!(name = resolve_template(u, name, path, &s)))
1484                 return -ENOMEM;
1485
1486         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1487                 goto finish;
1488
1489         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1490
1491 finish:
1492         free(s);
1493         return r;
1494 }
1495
1496 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1497         Unit *other;
1498         int r;
1499         char *s;
1500
1501         assert(u);
1502         assert(name || path);
1503
1504         if (!(name = resolve_template(u, name, path, &s)))
1505                 return -ENOMEM;
1506
1507         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1508                 goto finish;
1509
1510         r = unit_add_dependency(other, d, u, add_reference);
1511
1512 finish:
1513         free(s);
1514         return r;
1515 }
1516
1517 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1518         Unit *other;
1519         int r;
1520         char *s;
1521
1522         assert(u);
1523         assert(name || path);
1524
1525         if (!(name = resolve_template(u, name, path, &s)))
1526                 return -ENOMEM;
1527
1528         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1529                 goto finish;
1530
1531         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1532                 goto finish;
1533
1534 finish:
1535         free(s);
1536         return r;
1537 }
1538
1539 int set_unit_path(const char *p) {
1540         char *cwd, *c;
1541         int r;
1542
1543         /* This is mostly for debug purposes */
1544
1545         if (path_is_absolute(p)) {
1546                 if (!(c = strdup(p)))
1547                         return -ENOMEM;
1548         } else {
1549                 if (!(cwd = get_current_dir_name()))
1550                         return -errno;
1551
1552                 r = asprintf(&c, "%s/%s", cwd, p);
1553                 free(cwd);
1554
1555                 if (r < 0)
1556                         return -ENOMEM;
1557         }
1558
1559         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1560                 r = -errno;
1561                 free(c);
1562                 return r;
1563         }
1564
1565         return 0;
1566 }
1567
1568 char *unit_dbus_path(Unit *u) {
1569         char *p, *e;
1570
1571         assert(u);
1572
1573         if (!u->meta.id)
1574                 return NULL;
1575
1576         if (!(e = bus_path_escape(u->meta.id)))
1577                 return NULL;
1578
1579         p = strappend("/org/freedesktop/systemd1/unit/", e);
1580         free(e);
1581
1582         return p;
1583 }
1584
1585 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1586         CGroupBonding *l;
1587         int r;
1588
1589         assert(u);
1590         assert(b);
1591
1592         assert(b->path);
1593
1594         if (!b->controller)
1595                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1596                         return -ENOMEM;
1597
1598         /* Ensure this hasn't been added yet */
1599         assert(!b->unit);
1600
1601         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1602         LIST_PREPEND(CGroupBonding, by_path, l, b);
1603
1604         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1605                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1606                 return r;
1607         }
1608
1609         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1610         b->unit = u;
1611
1612         return 0;
1613 }
1614
1615 static char *default_cgroup_path(Unit *u) {
1616         char *p;
1617         int r;
1618
1619         assert(u);
1620
1621         if (u->meta.instance) {
1622                 char *t;
1623
1624                 if (!(t = unit_name_template(u->meta.id)))
1625                         return NULL;
1626
1627                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1628                 free(t);
1629         } else
1630                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1631
1632         return r < 0 ? NULL : p;
1633 }
1634
1635 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1636         char *controller = NULL, *path = NULL;
1637         CGroupBonding *b = NULL;
1638         int r;
1639
1640         assert(u);
1641         assert(name);
1642
1643         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1644                 return r;
1645
1646         if (!path)
1647                 path = default_cgroup_path(u);
1648
1649         if (!controller)
1650                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1651
1652         if (!path || !controller) {
1653                 free(path);
1654                 free(controller);
1655
1656                 return -ENOMEM;
1657         }
1658
1659         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1660                 r = -EEXIST;
1661                 goto fail;
1662         }
1663
1664         if (!(b = new0(CGroupBonding, 1))) {
1665                 r = -ENOMEM;
1666                 goto fail;
1667         }
1668
1669         b->controller = controller;
1670         b->path = path;
1671         b->only_us = false;
1672         b->clean_up = false;
1673
1674         if ((r = unit_add_cgroup(u, b)) < 0)
1675                 goto fail;
1676
1677         return 0;
1678
1679 fail:
1680         free(path);
1681         free(controller);
1682         free(b);
1683
1684         return r;
1685 }
1686
1687 int unit_add_default_cgroup(Unit *u) {
1688         CGroupBonding *b;
1689         int r = -ENOMEM;
1690
1691         assert(u);
1692
1693         /* Adds in the default cgroup data, if it wasn't specified yet */
1694
1695         if (unit_get_default_cgroup(u))
1696                 return 0;
1697
1698         if (!(b = new0(CGroupBonding, 1)))
1699                 return -ENOMEM;
1700
1701         if (!(b->path = default_cgroup_path(u)))
1702                 goto fail;
1703
1704         b->clean_up = true;
1705         b->only_us = true;
1706
1707         if ((r = unit_add_cgroup(u, b)) < 0)
1708                 goto fail;
1709
1710         return 0;
1711
1712 fail:
1713         free(b->path);
1714         free(b->controller);
1715         free(b);
1716
1717         return r;
1718 }
1719
1720 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1721         assert(u);
1722
1723         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1724 }
1725
1726 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1727         char *t;
1728         int r;
1729
1730         assert(u);
1731         assert(type);
1732         assert(_found);
1733
1734         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1735                 return -ENOMEM;
1736
1737         assert(!unit_has_name(u, t));
1738
1739         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1740         free(t);
1741
1742         assert(r < 0 || *_found != u);
1743
1744         return r;
1745 }
1746
1747 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1748         Unit *found;
1749         char *t;
1750
1751         assert(u);
1752         assert(type);
1753         assert(_found);
1754
1755         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1756                 return -ENOMEM;
1757
1758         assert(!unit_has_name(u, t));
1759
1760         found = manager_get_unit(u->meta.manager, t);
1761         free(t);
1762
1763         if (!found)
1764                 return -ENOENT;
1765
1766         *_found = found;
1767         return 0;
1768 }
1769
1770 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1771         Unit *u = userdata;
1772         assert(u);
1773
1774         return unit_name_to_prefix_and_instance(u->meta.id);
1775 }
1776
1777 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1778         Unit *u = userdata;
1779         assert(u);
1780
1781         return unit_name_to_prefix(u->meta.id);
1782 }
1783
1784 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1785         Unit *u = userdata;
1786         char *p, *r;
1787
1788         assert(u);
1789
1790         if (!(p = unit_name_to_prefix(u->meta.id)))
1791                 return NULL;
1792
1793         r = unit_name_unescape(p);
1794         free(p);
1795
1796         return r;
1797 }
1798
1799 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1800         Unit *u = userdata;
1801         assert(u);
1802
1803         if (u->meta.instance)
1804                 return unit_name_unescape(u->meta.instance);
1805
1806         return strdup("");
1807 }
1808
1809 char *unit_name_printf(Unit *u, const char* format) {
1810
1811         /*
1812          * This will use the passed string as format string and
1813          * replace the following specifiers:
1814          *
1815          * %n: the full id of the unit                 (foo@bar.waldo)
1816          * %N: the id of the unit without the suffix   (foo@bar)
1817          * %p: the prefix                              (foo)
1818          * %i: the instance                            (bar)
1819          */
1820
1821         const Specifier table[] = {
1822                 { 'n', specifier_string,              u->meta.id },
1823                 { 'N', specifier_prefix_and_instance, NULL },
1824                 { 'p', specifier_prefix,              NULL },
1825                 { 'i', specifier_string,              u->meta.instance },
1826                 { 0, NULL, NULL }
1827         };
1828
1829         assert(u);
1830         assert(format);
1831
1832         return specifier_printf(format, table, u);
1833 }
1834
1835 char *unit_full_printf(Unit *u, const char *format) {
1836
1837         /* This is similar to unit_name_printf() but also supports
1838          * unescaping */
1839
1840         const Specifier table[] = {
1841                 { 'n', specifier_string,              u->meta.id },
1842                 { 'N', specifier_prefix_and_instance, NULL },
1843                 { 'p', specifier_prefix,              NULL },
1844                 { 'P', specifier_prefix_unescaped,    NULL },
1845                 { 'i', specifier_string,              u->meta.instance },
1846                 { 'I', specifier_instance_unescaped,  NULL },
1847                 { 0, NULL, NULL }
1848         };
1849
1850         assert(u);
1851         assert(format);
1852
1853         return specifier_printf(format, table, u);
1854 }
1855
1856 char **unit_full_printf_strv(Unit *u, char **l) {
1857         size_t n;
1858         char **r, **i, **j;
1859
1860         /* Applies unit_full_printf to every entry in l */
1861
1862         assert(u);
1863
1864         n = strv_length(l);
1865         if (!(r = new(char*, n+1)))
1866                 return NULL;
1867
1868         for (i = l, j = r; *i; i++, j++)
1869                 if (!(*j = unit_full_printf(u, *i)))
1870                         goto fail;
1871
1872         *j = NULL;
1873         return r;
1874
1875 fail:
1876         j--;
1877         while (j >= r)
1878                 free(*j);
1879
1880         free(r);
1881
1882         return NULL;
1883 }
1884
1885 int unit_watch_bus_name(Unit *u, const char *name) {
1886         assert(u);
1887         assert(name);
1888
1889         /* Watch a specific name on the bus. We only support one unit
1890          * watching each name for now. */
1891
1892         return hashmap_put(u->meta.manager->watch_bus, name, u);
1893 }
1894
1895 void unit_unwatch_bus_name(Unit *u, const char *name) {
1896         assert(u);
1897         assert(name);
1898
1899         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1900 }
1901
1902 bool unit_can_serialize(Unit *u) {
1903         assert(u);
1904
1905         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1906 }
1907
1908 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1909         int r;
1910
1911         assert(u);
1912         assert(f);
1913         assert(fds);
1914
1915         if (!unit_can_serialize(u))
1916                 return 0;
1917
1918         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1919                 return r;
1920
1921         if (u->meta.job)
1922                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1923
1924         /* End marker */
1925         fputc('\n', f);
1926         return 0;
1927 }
1928
1929 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1930         va_list ap;
1931
1932         assert(u);
1933         assert(f);
1934         assert(key);
1935         assert(format);
1936
1937         fputs(key, f);
1938         fputc('=', f);
1939
1940         va_start(ap, format);
1941         vfprintf(f, format, ap);
1942         va_end(ap);
1943
1944         fputc('\n', f);
1945 }
1946
1947 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1948         assert(u);
1949         assert(f);
1950         assert(key);
1951         assert(value);
1952
1953         fprintf(f, "%s=%s\n", key, value);
1954 }
1955
1956 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1957         int r;
1958
1959         assert(u);
1960         assert(f);
1961         assert(fds);
1962
1963         if (!unit_can_serialize(u))
1964                 return 0;
1965
1966         for (;;) {
1967                 char line[1024], *l, *v;
1968                 size_t k;
1969
1970                 if (!fgets(line, sizeof(line), f)) {
1971                         if (feof(f))
1972                                 return 0;
1973                         return -errno;
1974                 }
1975
1976                 char_array_0(line);
1977                 l = strstrip(line);
1978
1979                 /* End marker */
1980                 if (l[0] == 0)
1981                         return 0;
1982
1983                 k = strcspn(l, "=");
1984
1985                 if (l[k] == '=') {
1986                         l[k] = 0;
1987                         v = l+k+1;
1988                 } else
1989                         v = l+k;
1990
1991                 if (streq(l, "job")) {
1992                         JobType type;
1993
1994                         if ((type = job_type_from_string(v)) < 0)
1995                                 log_debug("Failed to parse job type value %s", v);
1996                         else
1997                                 u->meta.deserialized_job = type;
1998
1999                         continue;
2000                 }
2001
2002                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2003                         return r;
2004         }
2005 }
2006
2007 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2008         Unit *device;
2009         char *e;
2010         int r;
2011
2012         assert(u);
2013
2014         if (!what)
2015                 return 0;
2016
2017         /* Adds in links to the device node that this unit is based on */
2018
2019         if (!is_device_path(what))
2020                 return 0;
2021
2022         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2023                 return -ENOMEM;
2024
2025         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2026         free(e);
2027
2028         if (r < 0)
2029                 return r;
2030
2031         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2032                 return r;
2033
2034         if (wants)
2035                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2036                         return r;
2037
2038         return 0;
2039 }
2040
2041 int unit_coldplug(Unit *u) {
2042         int r;
2043
2044         assert(u);
2045
2046         if (UNIT_VTABLE(u)->coldplug)
2047                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2048                         return r;
2049
2050         if (u->meta.deserialized_job >= 0) {
2051                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2052                         return r;
2053
2054                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2055         }
2056
2057         return 0;
2058 }
2059
2060 void unit_status_printf(Unit *u, const char *format, ...) {
2061         va_list ap;
2062
2063         assert(u);
2064         assert(format);
2065
2066         if (!UNIT_VTABLE(u)->show_status)
2067                 return;
2068
2069         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2070                 return;
2071
2072         if (!u->meta.manager->show_status)
2073                 return;
2074
2075         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2076                 return;
2077
2078         va_start(ap, format);
2079         status_vprintf(format, ap);
2080         va_end(ap);
2081 }
2082
2083 bool unit_need_daemon_reload(Unit *u) {
2084         struct stat st;
2085
2086         assert(u);
2087
2088         if (!u->meta.fragment_path)
2089                 return false;
2090
2091         zero(st);
2092         if (stat(u->meta.fragment_path, &st) < 0)
2093                 /* What, cannot access this anymore? */
2094                 return true;
2095
2096         return
2097                 u->meta.fragment_mtime &&
2098                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2099 }
2100
2101 void unit_reset_maintenance(Unit *u) {
2102         assert(u);
2103
2104         if (UNIT_VTABLE(u)->reset_maintenance)
2105                 UNIT_VTABLE(u)->reset_maintenance(u);
2106 }
2107
2108 Unit *unit_following(Unit *u) {
2109         assert(u);
2110
2111         if (UNIT_VTABLE(u)->following)
2112                 return UNIT_VTABLE(u)->following(u);
2113
2114         return NULL;
2115 }
2116
2117 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2118         [UNIT_STUB] = "stub",
2119         [UNIT_LOADED] = "loaded",
2120         [UNIT_FAILED] = "failed",
2121         [UNIT_MERGED] = "merged"
2122 };
2123
2124 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2125
2126 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2127         [UNIT_ACTIVE] = "active",
2128         [UNIT_RELOADING] = "reloading",
2129         [UNIT_INACTIVE] = "inactive",
2130         [UNIT_MAINTENANCE] = "maintenance",
2131         [UNIT_ACTIVATING] = "activating",
2132         [UNIT_DEACTIVATING] = "deactivating"
2133 };
2134
2135 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2136
2137 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2138         [UNIT_REQUIRES] = "Requires",
2139         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2140         [UNIT_WANTS] = "Wants",
2141         [UNIT_REQUISITE] = "Requisite",
2142         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2143         [UNIT_REQUIRED_BY] = "RequiredBy",
2144         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2145         [UNIT_WANTED_BY] = "WantedBy",
2146         [UNIT_CONFLICTS] = "Conflicts",
2147         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2148         [UNIT_BEFORE] = "Before",
2149         [UNIT_AFTER] = "After",
2150         [UNIT_REFERENCES] = "References",
2151         [UNIT_REFERENCED_BY] = "ReferencedBy",
2152         [UNIT_ON_FAILURE] = "OnFailure"
2153 };
2154
2155 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2156
2157 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2158         [KILL_CONTROL_GROUP] = "control-group",
2159         [KILL_PROCESS_GROUP] = "process-group",
2160         [KILL_PROCESS] = "process",
2161         [KILL_NONE] = "none"
2162 };
2163
2164 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);