src/unit.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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_FAILED. */
 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_ERROR)
 483                 return -EEXIST;
 484
 485         if (other->meta.job)
 486                 return -EEXIST;
 487
 488         if (!UNIT_IS_INACTIVE_OR_FAILED(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         else if (u->meta.load_state == UNIT_ERROR)
 676                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 677
 678
 679         if (u->meta.job)
 680                 job_dump(u->meta.job, f, prefix2);
 681
 682         free(p2);
 683 }
 684
 685 /* Common implementation for multiple backends */
 686 int unit_load_fragment_and_dropin(Unit *u) {
 687         int r;
 688
 689         assert(u);
 690
 691         /* Load a .service file */
 692         if ((r = unit_load_fragment(u)) < 0)
 693                 return r;
 694
 695         if (u->meta.load_state == UNIT_STUB)
 696                 return -ENOENT;
 697
 698         /* Load drop-in directory data */
 699         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 700                 return r;
 701
 702         return 0;
 703 }
 704
 705 /* Common implementation for multiple backends */
 706 int unit_load_fragment_and_dropin_optional(Unit *u) {
 707         int r;
 708
 709         assert(u);
 710
 711         /* Same as unit_load_fragment_and_dropin(), but whether
 712          * something can be loaded or not doesn't matter. */
 713
 714         /* Load a .service file */
 715         if ((r = unit_load_fragment(u)) < 0)
 716                 return r;
 717
 718         if (u->meta.load_state == UNIT_STUB)
 719                 u->meta.load_state = UNIT_LOADED;
 720
 721         /* Load drop-in directory data */
 722         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 723                 return r;
 724
 725         return 0;
 726 }
 727
 728 int unit_load(Unit *u) {
 729         int r;
 730
 731         assert(u);
 732
 733         if (u->meta.in_load_queue) {
 734                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 735                 u->meta.in_load_queue = false;
 736         }
 737
 738         if (u->meta.type == _UNIT_TYPE_INVALID)
 739                 return -EINVAL;
 740
 741         if (u->meta.load_state != UNIT_STUB)
 742                 return 0;
 743
 744         if (UNIT_VTABLE(u)->load)
 745                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 746                         goto fail;
 747
 748         if (u->meta.load_state == UNIT_STUB) {
 749                 r = -ENOENT;
 750                 goto fail;
 751         }
 752
 753         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 754
 755         unit_add_to_dbus_queue(unit_follow_merge(u));
 756         unit_add_to_gc_queue(u);
 757
 758         return 0;
 759
 760 fail:
 761         u->meta.load_state = UNIT_ERROR;
 762         u->meta.load_error = r;
 763         unit_add_to_dbus_queue(u);
 764
 765         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 766
 767         return r;
 768 }
 769
 770 /* Errors:
 771  *         -EBADR:     This unit type does not support starting.
 772  *         -EALREADY:  Unit is already started.
 773  *         -EAGAIN:    An operation is already in progress. Retry later.
 774  *         -ECANCELED: Too many requests for now.
 775  */
 776 int unit_start(Unit *u) {
 777         UnitActiveState state;
 778
 779         assert(u);
 780
 781         if (u->meta.load_state != UNIT_LOADED)
 782                 return -EINVAL;
 783
 784         /* If this is already (being) started, then this will
 785          * succeed. Note that this will even succeed if this unit is
 786          * not startable by the user. This is relied on to detect when
 787          * we need to wait for units and when waiting is finished. */
 788         state = unit_active_state(u);
 789         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 790                 return -EALREADY;
 791
 792         /* If it is stopped, but we cannot start it, then fail */
 793         if (!UNIT_VTABLE(u)->start)
 794                 return -EBADR;
 795
 796         /* We don't suppress calls to ->start() here when we are
 797          * already starting, to allow this request to be used as a
 798          * "hurry up" call, for example when the unit is in some "auto
 799          * restart" state where it waits for a holdoff timer to elapse
 800          * before it will start again. */
 801
 802         unit_add_to_dbus_queue(u);
 803
 804         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 805
 806         return UNIT_VTABLE(u)->start(u);
 807 }
 808
 809 bool unit_can_start(Unit *u) {
 810         assert(u);
 811
 812         return !!UNIT_VTABLE(u)->start;
 813 }
 814
 815 bool unit_can_isolate(Unit *u) {
 816         assert(u);
 817
 818         return unit_can_start(u) &&
 819                 u->meta.allow_isolate;
 820 }
 821
 822 /* Errors:
 823  *         -EBADR:    This unit type does not support stopping.
 824  *         -EALREADY: Unit is already stopped.
 825  *         -EAGAIN:   An operation is already in progress. Retry later.
 826  */
 827 int unit_stop(Unit *u) {
 828         UnitActiveState state;
 829
 830         assert(u);
 831
 832         state = unit_active_state(u);
 833         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 834                 return -EALREADY;
 835
 836         if (!UNIT_VTABLE(u)->stop)
 837                 return -EBADR;
 838
 839         unit_add_to_dbus_queue(u);
 840
 841         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 842
 843         return UNIT_VTABLE(u)->stop(u);
 844 }
 845
 846 /* Errors:
 847  *         -EBADR:    This unit type does not support reloading.
 848  *         -ENOEXEC:  Unit is not started.
 849  *         -EAGAIN:   An operation is already in progress. Retry later.
 850  */
 851 int unit_reload(Unit *u) {
 852         UnitActiveState state;
 853
 854         assert(u);
 855
 856         if (u->meta.load_state != UNIT_LOADED)
 857                 return -EINVAL;
 858
 859         if (!unit_can_reload(u))
 860                 return -EBADR;
 861
 862         state = unit_active_state(u);
 863         if (state == UNIT_RELOADING)
 864                 return -EALREADY;
 865
 866         if (state != UNIT_ACTIVE)
 867                 return -ENOEXEC;
 868
 869         unit_add_to_dbus_queue(u);
 870         return UNIT_VTABLE(u)->reload(u);
 871 }
 872
 873 bool unit_can_reload(Unit *u) {
 874         assert(u);
 875
 876         if (!UNIT_VTABLE(u)->reload)
 877                 return false;
 878
 879         if (!UNIT_VTABLE(u)->can_reload)
 880                 return true;
 881
 882         return UNIT_VTABLE(u)->can_reload(u);
 883 }
 884
 885 static void unit_check_uneeded(Unit *u) {
 886         Iterator i;
 887         Unit *other;
 888
 889         assert(u);
 890
 891         /* If this service shall be shut down when unneeded then do
 892          * so. */
 893
 894         if (!u->meta.stop_when_unneeded)
 895                 return;
 896
 897         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 898                 return;
 899
 900         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 901                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 902                         return;
 903
 904         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 905                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 906                         return;
 907
 908         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 909                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 910                         return;
 911
 912         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 913
 914         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 915         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 916 }
 917
 918 static void retroactively_start_dependencies(Unit *u) {
 919         Iterator i;
 920         Unit *other;
 921
 922         assert(u);
 923         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 924
 925         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 926                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 927                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 928
 929         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 930                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 931                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 932
 933         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 934                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 935                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 936
 937         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 938                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 939                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 940
 941         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], 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         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 946                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 947                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 948 }
 949
 950 static void retroactively_stop_dependencies(Unit *u) {
 951         Iterator i;
 952         Unit *other;
 953
 954         assert(u);
 955         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 956
 957         if (u->meta.recursive_stop) {
 958                 /* Pull down units need us recursively if enabled */
 959                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 960                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 961                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 962         }
 963
 964         /* Garbage collect services that might not be needed anymore, if enabled */
 965         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 966                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 967                         unit_check_uneeded(other);
 968         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 969                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 970                         unit_check_uneeded(other);
 971         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 972                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 973                         unit_check_uneeded(other);
 974         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 975                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 976                         unit_check_uneeded(other);
 977         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
 978                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 979                         unit_check_uneeded(other);
 980 }
 981
 982 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 983         dual_timestamp ts;
 984         bool unexpected;
 985
 986         assert(u);
 987         assert(os < _UNIT_ACTIVE_STATE_MAX);
 988         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 989
 990         /* Note that this is called for all low-level state changes,
 991          * even if they might map to the same high-level
 992          * UnitActiveState! That means that ns == os is OK an expected
 993          * behaviour here. For example: if a mount point is remounted
 994          * this function will be called too! */
 995
 996         dual_timestamp_get(&ts);
 997
 998         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
 999                 u->meta.inactive_exit_timestamp = ts;
1000         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1001                 u->meta.inactive_enter_timestamp = ts;
1002
1003         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1004                 u->meta.active_enter_timestamp = ts;
1005         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1006                 u->meta.active_exit_timestamp = ts;
1007
1008         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1009                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1010
1011         timer_unit_notify(u, ns);
1012         path_unit_notify(u, ns);
1013
1014         if (u->meta.job) {
1015                 unexpected = false;
1016
1017                 if (u->meta.job->state == JOB_WAITING)
1018
1019                         /* So we reached a different state for this
1020                          * job. Let's see if we can run it now if it
1021                          * failed previously due to EAGAIN. */
1022                         job_add_to_run_queue(u->meta.job);
1023
1024                 /* Let's check whether this state change constitutes a
1025                  * finished job, or maybe cotradicts a running job and
1026                  * hence needs to invalidate jobs. */
1027
1028                 switch (u->meta.job->type) {
1029
1030                 case JOB_START:
1031                 case JOB_VERIFY_ACTIVE:
1032
1033                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1034                                 job_finish_and_invalidate(u->meta.job, true);
1035                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1036                                 unexpected = true;
1037
1038                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1039                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1040                         }
1041
1042                         break;
1043
1044                 case JOB_RELOAD:
1045                 case JOB_RELOAD_OR_START:
1046
1047                         if (u->meta.job->state == JOB_RUNNING) {
1048                                 if (ns == UNIT_ACTIVE)
1049                                         job_finish_and_invalidate(u->meta.job, true);
1050                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1051                                         unexpected = true;
1052
1053                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1054                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1055                                 }
1056                         }
1057
1058                         break;
1059
1060                 case JOB_STOP:
1061                 case JOB_RESTART:
1062                 case JOB_TRY_RESTART:
1063
1064                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1065                                 job_finish_and_invalidate(u->meta.job, true);
1066                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1067                                 unexpected = true;
1068                                 job_finish_and_invalidate(u->meta.job, false);
1069                         }
1070
1071                         break;
1072
1073                 default:
1074                         assert_not_reached("Job type unknown");
1075                 }
1076
1077         } else
1078                 unexpected = true;
1079
1080         /* If this state change happened without being requested by a
1081          * job, then let's retroactively start or stop
1082          * dependencies. We skip that step when deserializing, since
1083          * we don't want to create any additional jobs just because
1084          * something is already activated. */
1085
1086         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1087                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1088                         retroactively_start_dependencies(u);
1089                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1090                         retroactively_stop_dependencies(u);
1091         }
1092
1093         if (ns != os && ns == UNIT_FAILED) {
1094                 Iterator i;
1095                 Unit *other;
1096
1097                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1098                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1099
1100                 log_notice("Unit %s entered failed state.", u->meta.id);
1101         }
1102
1103         /* Some names are special */
1104         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1105                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1106                         /* The bus just might have become available,
1107                          * hence try to connect to it, if we aren't
1108                          * yet connected. */
1109                         bus_init(u->meta.manager);
1110
1111                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1112                         /* The syslog daemon just might have become
1113                          * available, hence try to connect to it, if
1114                          * we aren't yet connected. */
1115                         log_open();
1116
1117                 if (u->meta.type == UNIT_SERVICE &&
1118                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1119                         /* Write audit record if we have just finished starting up */
1120                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1121                         u->meta.in_audit = true;
1122                 }
1123
1124         } else {
1125
1126                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1127                         /* The syslog daemon might just have
1128                          * terminated, hence try to disconnect from
1129                          * it. */
1130                         log_close_syslog();
1131
1132                 /* We don't care about D-Bus here, since we'll get an
1133                  * asynchronous notification for it anyway. */
1134
1135                 if (u->meta.type == UNIT_SERVICE &&
1136                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1137                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1138
1139                         /* Hmm, if there was no start record written
1140                          * write it now, so that we always have a nice
1141                          * pair */
1142                         if (!u->meta.in_audit) {
1143                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1144
1145                                 if (ns == UNIT_INACTIVE)
1146                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1147                         } else
1148                                 /* Write audit record if we have just finished shutting down */
1149                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1150
1151                         u->meta.in_audit = false;
1152                 }
1153         }
1154
1155         /* Maybe we finished startup and are now ready for being
1156          * stopped because unneeded? */
1157         unit_check_uneeded(u);
1158
1159         unit_add_to_dbus_queue(u);
1160         unit_add_to_gc_queue(u);
1161 }
1162
1163 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1164         struct epoll_event ev;
1165
1166         assert(u);
1167         assert(fd >= 0);
1168         assert(w);
1169         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1170
1171         zero(ev);
1172         ev.data.ptr = w;
1173         ev.events = events;
1174
1175         if (epoll_ctl(u->meta.manager->epoll_fd,
1176                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1177                       fd,
1178                       &ev) < 0)
1179                 return -errno;
1180
1181         w->fd = fd;
1182         w->type = WATCH_FD;
1183         w->data.unit = u;
1184
1185         return 0;
1186 }
1187
1188 void unit_unwatch_fd(Unit *u, Watch *w) {
1189         assert(u);
1190         assert(w);
1191
1192         if (w->type == WATCH_INVALID)
1193                 return;
1194
1195         assert(w->type == WATCH_FD);
1196         assert(w->data.unit == u);
1197         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1198
1199         w->fd = -1;
1200         w->type = WATCH_INVALID;
1201         w->data.unit = NULL;
1202 }
1203
1204 int unit_watch_pid(Unit *u, pid_t pid) {
1205         assert(u);
1206         assert(pid >= 1);
1207
1208         /* Watch a specific PID. We only support one unit watching
1209          * each PID for now. */
1210
1211         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1212 }
1213
1214 void unit_unwatch_pid(Unit *u, pid_t pid) {
1215         assert(u);
1216         assert(pid >= 1);
1217
1218         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1219 }
1220
1221 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1222         struct itimerspec its;
1223         int flags, fd;
1224         bool ours;
1225
1226         assert(u);
1227         assert(w);
1228         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1229
1230         /* This will try to reuse the old timer if there is one */
1231
1232         if (w->type == WATCH_UNIT_TIMER) {
1233                 assert(w->data.unit == u);
1234                 assert(w->fd >= 0);
1235
1236                 ours = false;
1237                 fd = w->fd;
1238         } else if (w->type == WATCH_INVALID) {
1239
1240                 ours = true;
1241                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1242                         return -errno;
1243         } else
1244                 assert_not_reached("Invalid watch type");
1245
1246         zero(its);
1247
1248         if (delay <= 0) {
1249                 /* Set absolute time in the past, but not 0, since we
1250                  * don't want to disarm the timer */
1251                 its.it_value.tv_sec = 0;
1252                 its.it_value.tv_nsec = 1;
1253
1254                 flags = TFD_TIMER_ABSTIME;
1255         } else {
1256                 timespec_store(&its.it_value, delay);
1257                 flags = 0;
1258         }
1259
1260         /* This will also flush the elapse counter */
1261         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1262                 goto fail;
1263
1264         if (w->type == WATCH_INVALID) {
1265                 struct epoll_event ev;
1266
1267                 zero(ev);
1268                 ev.data.ptr = w;
1269                 ev.events = EPOLLIN;
1270
1271                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1272                         goto fail;
1273         }
1274
1275         w->type = WATCH_UNIT_TIMER;
1276         w->fd = fd;
1277         w->data.unit = u;
1278
1279         return 0;
1280
1281 fail:
1282         if (ours)
1283                 close_nointr_nofail(fd);
1284
1285         return -errno;
1286 }
1287
1288 void unit_unwatch_timer(Unit *u, Watch *w) {
1289         assert(u);
1290         assert(w);
1291
1292         if (w->type == WATCH_INVALID)
1293                 return;
1294
1295         assert(w->type == WATCH_UNIT_TIMER);
1296         assert(w->data.unit == u);
1297         assert(w->fd >= 0);
1298
1299         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1300         close_nointr_nofail(w->fd);
1301
1302         w->fd = -1;
1303         w->type = WATCH_INVALID;
1304         w->data.unit = NULL;
1305 }
1306
1307 bool unit_job_is_applicable(Unit *u, JobType j) {
1308         assert(u);
1309         assert(j >= 0 && j < _JOB_TYPE_MAX);
1310
1311         switch (j) {
1312
1313         case JOB_VERIFY_ACTIVE:
1314         case JOB_START:
1315                 return true;
1316
1317         case JOB_STOP:
1318         case JOB_RESTART:
1319         case JOB_TRY_RESTART:
1320                 return unit_can_start(u);
1321
1322         case JOB_RELOAD:
1323                 return unit_can_reload(u);
1324
1325         case JOB_RELOAD_OR_START:
1326                 return unit_can_reload(u) && unit_can_start(u);
1327
1328         default:
1329                 assert_not_reached("Invalid job type");
1330         }
1331 }
1332
1333 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1334
1335         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1336                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1337                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1338                 [UNIT_WANTS] = UNIT_WANTED_BY,
1339                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1340                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1341                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1342                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1343                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1344                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1345                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1346                 [UNIT_BEFORE] = UNIT_AFTER,
1347                 [UNIT_AFTER] = UNIT_BEFORE,
1348                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1349                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1350                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1351         };
1352         int r, q = 0, v = 0, w = 0;
1353
1354         assert(u);
1355         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1356         assert(other);
1357
1358         /* We won't allow dependencies on ourselves. We will not
1359          * consider them an error however. */
1360         if (u == other)
1361                 return 0;
1362
1363         if (UNIT_VTABLE(u)->no_requires &&
1364             (d == UNIT_REQUIRES ||
1365              d == UNIT_REQUIRES_OVERRIDABLE ||
1366              d == UNIT_REQUISITE ||
1367              d == UNIT_REQUISITE_OVERRIDABLE)) {
1368                     return -EINVAL;
1369         }
1370
1371         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1372                 return r;
1373
1374         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1375                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1376                         return r;
1377
1378         if (add_reference)
1379                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1380                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1381                         return r;
1382
1383         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1384                 return q;
1385
1386         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1387                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1388                         r = v;
1389                         goto fail;
1390                 }
1391
1392         if (add_reference) {
1393                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1394                         r = w;
1395                         goto fail;
1396                 }
1397
1398                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1399                         goto fail;
1400         }
1401
1402         unit_add_to_dbus_queue(u);
1403         return 0;
1404
1405 fail:
1406         if (q > 0)
1407                 set_remove(u->meta.dependencies[d], other);
1408
1409         if (v > 0)
1410                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1411
1412         if (w > 0)
1413                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1414
1415         return r;
1416 }
1417
1418 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1419         int r;
1420
1421         assert(u);
1422
1423         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1424                 return r;
1425
1426         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1427                 return r;
1428
1429         return 0;
1430 }
1431
1432 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1433         char *s;
1434
1435         assert(u);
1436         assert(name || path);
1437
1438         if (!name)
1439                 name = file_name_from_path(path);
1440
1441         if (!unit_name_is_template(name)) {
1442                 *p = NULL;
1443                 return name;
1444         }
1445
1446         if (u->meta.instance)
1447                 s = unit_name_replace_instance(name, u->meta.instance);
1448         else {
1449                 char *i;
1450
1451                 if (!(i = unit_name_to_prefix(u->meta.id)))
1452                         return NULL;
1453
1454                 s = unit_name_replace_instance(name, i);
1455                 free(i);
1456         }
1457
1458         if (!s)
1459                 return NULL;
1460
1461         *p = s;
1462         return s;
1463 }
1464
1465 int unit_add_dependency_by_name(Unit *u, UnitDependency d, 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_dependency(u, d, other, add_reference);
1480
1481 finish:
1482         free(s);
1483         return r;
1484 }
1485
1486 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, 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_two_dependencies(u, d, e, other, add_reference);
1501
1502 finish:
1503         free(s);
1504         return r;
1505 }
1506
1507 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, 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         r = unit_add_dependency(other, d, u, add_reference);
1522
1523 finish:
1524         free(s);
1525         return r;
1526 }
1527
1528 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1529         Unit *other;
1530         int r;
1531         char *s;
1532
1533         assert(u);
1534         assert(name || path);
1535
1536         if (!(name = resolve_template(u, name, path, &s)))
1537                 return -ENOMEM;
1538
1539         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1540                 goto finish;
1541
1542         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1543                 goto finish;
1544
1545 finish:
1546         free(s);
1547         return r;
1548 }
1549
1550 int set_unit_path(const char *p) {
1551         char *cwd, *c;
1552         int r;
1553
1554         /* This is mostly for debug purposes */
1555
1556         if (path_is_absolute(p)) {
1557                 if (!(c = strdup(p)))
1558                         return -ENOMEM;
1559         } else {
1560                 if (!(cwd = get_current_dir_name()))
1561                         return -errno;
1562
1563                 r = asprintf(&c, "%s/%s", cwd, p);
1564                 free(cwd);
1565
1566                 if (r < 0)
1567                         return -ENOMEM;
1568         }
1569
1570         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1571                 r = -errno;
1572                 free(c);
1573                 return r;
1574         }
1575
1576         return 0;
1577 }
1578
1579 char *unit_dbus_path(Unit *u) {
1580         char *p, *e;
1581
1582         assert(u);
1583
1584         if (!u->meta.id)
1585                 return NULL;
1586
1587         if (!(e = bus_path_escape(u->meta.id)))
1588                 return NULL;
1589
1590         p = strappend("/org/freedesktop/systemd1/unit/", e);
1591         free(e);
1592
1593         return p;
1594 }
1595
1596 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1597         CGroupBonding *l;
1598         int r;
1599
1600         assert(u);
1601         assert(b);
1602
1603         assert(b->path);
1604
1605         if (!b->controller)
1606                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1607                         return -ENOMEM;
1608
1609         /* Ensure this hasn't been added yet */
1610         assert(!b->unit);
1611
1612         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1613         LIST_PREPEND(CGroupBonding, by_path, l, b);
1614
1615         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1616                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1617                 return r;
1618         }
1619
1620         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1621         b->unit = u;
1622
1623         return 0;
1624 }
1625
1626 static char *default_cgroup_path(Unit *u) {
1627         char *p;
1628         int r;
1629
1630         assert(u);
1631
1632         if (u->meta.instance) {
1633                 char *t;
1634
1635                 if (!(t = unit_name_template(u->meta.id)))
1636                         return NULL;
1637
1638                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1639                 free(t);
1640         } else
1641                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1642
1643         return r < 0 ? NULL : p;
1644 }
1645
1646 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1647         char *controller = NULL, *path = NULL;
1648         CGroupBonding *b = NULL;
1649         int r;
1650
1651         assert(u);
1652         assert(name);
1653
1654         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1655                 return r;
1656
1657         if (!path)
1658                 path = default_cgroup_path(u);
1659
1660         if (!controller)
1661                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1662
1663         if (!path || !controller) {
1664                 free(path);
1665                 free(controller);
1666
1667                 return -ENOMEM;
1668         }
1669
1670         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1671                 r = -EEXIST;
1672                 goto fail;
1673         }
1674
1675         if (!(b = new0(CGroupBonding, 1))) {
1676                 r = -ENOMEM;
1677                 goto fail;
1678         }
1679
1680         b->controller = controller;
1681         b->path = path;
1682         b->only_us = false;
1683         b->clean_up = false;
1684
1685         if ((r = unit_add_cgroup(u, b)) < 0)
1686                 goto fail;
1687
1688         return 0;
1689
1690 fail:
1691         free(path);
1692         free(controller);
1693         free(b);
1694
1695         return r;
1696 }
1697
1698 int unit_add_default_cgroup(Unit *u) {
1699         CGroupBonding *b;
1700         int r = -ENOMEM;
1701
1702         assert(u);
1703
1704         /* Adds in the default cgroup data, if it wasn't specified yet */
1705
1706         if (unit_get_default_cgroup(u))
1707                 return 0;
1708
1709         if (!(b = new0(CGroupBonding, 1)))
1710                 return -ENOMEM;
1711
1712         if (!(b->path = default_cgroup_path(u)))
1713                 goto fail;
1714
1715         b->clean_up = true;
1716         b->only_us = true;
1717
1718         if ((r = unit_add_cgroup(u, b)) < 0)
1719                 goto fail;
1720
1721         return 0;
1722
1723 fail:
1724         free(b->path);
1725         free(b->controller);
1726         free(b);
1727
1728         return r;
1729 }
1730
1731 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1732         assert(u);
1733
1734         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1735 }
1736
1737 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1738         char *t;
1739         int r;
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         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1751         free(t);
1752
1753         assert(r < 0 || *_found != u);
1754
1755         return r;
1756 }
1757
1758 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1759         Unit *found;
1760         char *t;
1761
1762         assert(u);
1763         assert(type);
1764         assert(_found);
1765
1766         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1767                 return -ENOMEM;
1768
1769         assert(!unit_has_name(u, t));
1770
1771         found = manager_get_unit(u->meta.manager, t);
1772         free(t);
1773
1774         if (!found)
1775                 return -ENOENT;
1776
1777         *_found = found;
1778         return 0;
1779 }
1780
1781 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1782         Unit *u = userdata;
1783         assert(u);
1784
1785         return unit_name_to_prefix_and_instance(u->meta.id);
1786 }
1787
1788 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1789         Unit *u = userdata;
1790         assert(u);
1791
1792         return unit_name_to_prefix(u->meta.id);
1793 }
1794
1795 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1796         Unit *u = userdata;
1797         char *p, *r;
1798
1799         assert(u);
1800
1801         if (!(p = unit_name_to_prefix(u->meta.id)))
1802                 return NULL;
1803
1804         r = unit_name_unescape(p);
1805         free(p);
1806
1807         return r;
1808 }
1809
1810 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1811         Unit *u = userdata;
1812         assert(u);
1813
1814         if (u->meta.instance)
1815                 return unit_name_unescape(u->meta.instance);
1816
1817         return strdup("");
1818 }
1819
1820 char *unit_name_printf(Unit *u, const char* format) {
1821
1822         /*
1823          * This will use the passed string as format string and
1824          * replace the following specifiers:
1825          *
1826          * %n: the full id of the unit                 (foo@bar.waldo)
1827          * %N: the id of the unit without the suffix   (foo@bar)
1828          * %p: the prefix                              (foo)
1829          * %i: the instance                            (bar)
1830          */
1831
1832         const Specifier table[] = {
1833                 { 'n', specifier_string,              u->meta.id },
1834                 { 'N', specifier_prefix_and_instance, NULL },
1835                 { 'p', specifier_prefix,              NULL },
1836                 { 'i', specifier_string,              u->meta.instance },
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(Unit *u, const char *format) {
1847
1848         /* This is similar to unit_name_printf() but also supports
1849          * unescaping */
1850
1851         const Specifier table[] = {
1852                 { 'n', specifier_string,              u->meta.id },
1853                 { 'N', specifier_prefix_and_instance, NULL },
1854                 { 'p', specifier_prefix,              NULL },
1855                 { 'P', specifier_prefix_unescaped,    NULL },
1856                 { 'i', specifier_string,              u->meta.instance },
1857                 { 'I', specifier_instance_unescaped,  NULL },
1858                 { 0, NULL, NULL }
1859         };
1860
1861         assert(u);
1862         assert(format);
1863
1864         return specifier_printf(format, table, u);
1865 }
1866
1867 char **unit_full_printf_strv(Unit *u, char **l) {
1868         size_t n;
1869         char **r, **i, **j;
1870
1871         /* Applies unit_full_printf to every entry in l */
1872
1873         assert(u);
1874
1875         n = strv_length(l);
1876         if (!(r = new(char*, n+1)))
1877                 return NULL;
1878
1879         for (i = l, j = r; *i; i++, j++)
1880                 if (!(*j = unit_full_printf(u, *i)))
1881                         goto fail;
1882
1883         *j = NULL;
1884         return r;
1885
1886 fail:
1887         j--;
1888         while (j >= r)
1889                 free(*j);
1890
1891         free(r);
1892
1893         return NULL;
1894 }
1895
1896 int unit_watch_bus_name(Unit *u, const char *name) {
1897         assert(u);
1898         assert(name);
1899
1900         /* Watch a specific name on the bus. We only support one unit
1901          * watching each name for now. */
1902
1903         return hashmap_put(u->meta.manager->watch_bus, name, u);
1904 }
1905
1906 void unit_unwatch_bus_name(Unit *u, const char *name) {
1907         assert(u);
1908         assert(name);
1909
1910         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1911 }
1912
1913 bool unit_can_serialize(Unit *u) {
1914         assert(u);
1915
1916         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1917 }
1918
1919 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1920         int r;
1921
1922         assert(u);
1923         assert(f);
1924         assert(fds);
1925
1926         if (!unit_can_serialize(u))
1927                 return 0;
1928
1929         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1930                 return r;
1931
1932         if (u->meta.job)
1933                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1934
1935         /* End marker */
1936         fputc('\n', f);
1937         return 0;
1938 }
1939
1940 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1941         va_list ap;
1942
1943         assert(u);
1944         assert(f);
1945         assert(key);
1946         assert(format);
1947
1948         fputs(key, f);
1949         fputc('=', f);
1950
1951         va_start(ap, format);
1952         vfprintf(f, format, ap);
1953         va_end(ap);
1954
1955         fputc('\n', f);
1956 }
1957
1958 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1959         assert(u);
1960         assert(f);
1961         assert(key);
1962         assert(value);
1963
1964         fprintf(f, "%s=%s\n", key, value);
1965 }
1966
1967 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1968         int r;
1969
1970         assert(u);
1971         assert(f);
1972         assert(fds);
1973
1974         if (!unit_can_serialize(u))
1975                 return 0;
1976
1977         for (;;) {
1978                 char line[1024], *l, *v;
1979                 size_t k;
1980
1981                 if (!fgets(line, sizeof(line), f)) {
1982                         if (feof(f))
1983                                 return 0;
1984                         return -errno;
1985                 }
1986
1987                 char_array_0(line);
1988                 l = strstrip(line);
1989
1990                 /* End marker */
1991                 if (l[0] == 0)
1992                         return 0;
1993
1994                 k = strcspn(l, "=");
1995
1996                 if (l[k] == '=') {
1997                         l[k] = 0;
1998                         v = l+k+1;
1999                 } else
2000                         v = l+k;
2001
2002                 if (streq(l, "job")) {
2003                         JobType type;
2004
2005                         if ((type = job_type_from_string(v)) < 0)
2006                                 log_debug("Failed to parse job type value %s", v);
2007                         else
2008                                 u->meta.deserialized_job = type;
2009
2010                         continue;
2011                 }
2012
2013                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2014                         return r;
2015         }
2016 }
2017
2018 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2019         Unit *device;
2020         char *e;
2021         int r;
2022
2023         assert(u);
2024
2025         if (!what)
2026                 return 0;
2027
2028         /* Adds in links to the device node that this unit is based on */
2029
2030         if (!is_device_path(what))
2031                 return 0;
2032
2033         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2034                 return -ENOMEM;
2035
2036         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2037         free(e);
2038
2039         if (r < 0)
2040                 return r;
2041
2042         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2043                 return r;
2044
2045         if (wants)
2046                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2047                         return r;
2048
2049         return 0;
2050 }
2051
2052 int unit_coldplug(Unit *u) {
2053         int r;
2054
2055         assert(u);
2056
2057         if (UNIT_VTABLE(u)->coldplug)
2058                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2059                         return r;
2060
2061         if (u->meta.deserialized_job >= 0) {
2062                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2063                         return r;
2064
2065                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2066         }
2067
2068         return 0;
2069 }
2070
2071 void unit_status_printf(Unit *u, const char *format, ...) {
2072         va_list ap;
2073
2074         assert(u);
2075         assert(format);
2076
2077         if (!UNIT_VTABLE(u)->show_status)
2078                 return;
2079
2080         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2081                 return;
2082
2083         if (!u->meta.manager->show_status)
2084                 return;
2085
2086         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2087                 return;
2088
2089         va_start(ap, format);
2090         status_vprintf(format, ap);
2091         va_end(ap);
2092 }
2093
2094 bool unit_need_daemon_reload(Unit *u) {
2095         struct stat st;
2096
2097         assert(u);
2098
2099         if (!u->meta.fragment_path)
2100                 return false;
2101
2102         zero(st);
2103         if (stat(u->meta.fragment_path, &st) < 0)
2104                 /* What, cannot access this anymore? */
2105                 return true;
2106
2107         return
2108                 u->meta.fragment_mtime &&
2109                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2110 }
2111
2112 void unit_reset_failed(Unit *u) {
2113         assert(u);
2114
2115         if (UNIT_VTABLE(u)->reset_failed)
2116                 UNIT_VTABLE(u)->reset_failed(u);
2117 }
2118
2119 Unit *unit_following(Unit *u) {
2120         assert(u);
2121
2122         if (UNIT_VTABLE(u)->following)
2123                 return UNIT_VTABLE(u)->following(u);
2124
2125         return NULL;
2126 }
2127
2128 bool unit_pending_inactive(Unit *u) {
2129         assert(u);
2130
2131         /* Returns true if the unit is inactive or going down */
2132
2133         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2134                 return true;
2135
2136         if (u->meta.job && u->meta.job->type == JOB_STOP)
2137                 return true;
2138
2139         return false;
2140 }
2141
2142 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2143         [UNIT_STUB] = "stub",
2144         [UNIT_LOADED] = "loaded",
2145         [UNIT_ERROR] = "error",
2146         [UNIT_MERGED] = "merged"
2147 };
2148
2149 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2150
2151 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2152         [UNIT_ACTIVE] = "active",
2153         [UNIT_RELOADING] = "reloading",
2154         [UNIT_INACTIVE] = "inactive",
2155         [UNIT_FAILED] = "failed",
2156         [UNIT_ACTIVATING] = "activating",
2157         [UNIT_DEACTIVATING] = "deactivating"
2158 };
2159
2160 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2161
2162 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2163         [UNIT_REQUIRES] = "Requires",
2164         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2165         [UNIT_WANTS] = "Wants",
2166         [UNIT_REQUISITE] = "Requisite",
2167         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2168         [UNIT_REQUIRED_BY] = "RequiredBy",
2169         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2170         [UNIT_WANTED_BY] = "WantedBy",
2171         [UNIT_CONFLICTS] = "Conflicts",
2172         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2173         [UNIT_BEFORE] = "Before",
2174         [UNIT_AFTER] = "After",
2175         [UNIT_REFERENCES] = "References",
2176         [UNIT_REFERENCED_BY] = "ReferencedBy",
2177         [UNIT_ON_FAILURE] = "OnFailure"
2178 };
2179
2180 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2181
2182 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2183         [KILL_CONTROL_GROUP] = "control-group",
2184         [KILL_PROCESS_GROUP] = "process-group",
2185         [KILL_PROCESS] = "process",
2186         [KILL_NONE] = "none"
2187 };
2188
2189 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);