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
  31 #include "set.h"
  32 #include "unit.h"
  33 #include "macro.h"
  34 #include "strv.h"
  35 #include "load-fragment.h"
  36 #include "load-dropin.h"
  37 #include "log.h"
  38
  39 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  40         [UNIT_SERVICE] = &service_vtable,
  41         [UNIT_TIMER] = &timer_vtable,
  42         [UNIT_SOCKET] = &socket_vtable,
  43         [UNIT_TARGET] = &target_vtable,
  44         [UNIT_DEVICE] = &device_vtable,
  45         [UNIT_MOUNT] = &mount_vtable,
  46         [UNIT_AUTOMOUNT] = &automount_vtable,
  47         [UNIT_SNAPSHOT] = &snapshot_vtable
  48 };
  49
  50 UnitType unit_name_to_type(const char *n) {
  51         UnitType t;
  52
  53         assert(n);
  54
  55         for (t = 0; t < _UNIT_TYPE_MAX; t++)
  56                 if (endswith(n, unit_vtable[t]->suffix))
  57                         return t;
  58
  59         return _UNIT_TYPE_INVALID;
  60 }
  61
  62 #define VALID_CHARS                             \
  63         "0123456789"                            \
  64         "abcdefghijklmnopqrstuvwxyz"            \
  65         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
  66         "-_.\\"
  67
  68 bool unit_name_is_valid(const char *n) {
  69         UnitType t;
  70         const char *e, *i;
  71
  72         assert(n);
  73
  74         if (strlen(n) >= UNIT_NAME_MAX)
  75                 return false;
  76
  77         t = unit_name_to_type(n);
  78         if (t < 0 || t >= _UNIT_TYPE_MAX)
  79                 return false;
  80
  81         if (!(e = strrchr(n, '.')))
  82                 return false;
  83
  84         if (e == n)
  85                 return false;
  86
  87         for (i = n; i < e; i++)
  88                 if (!strchr(VALID_CHARS, *i))
  89                         return false;
  90
  91         return true;
  92 }
  93
  94 char *unit_name_change_suffix(const char *n, const char *suffix) {
  95         char *e, *r;
  96         size_t a, b;
  97
  98         assert(n);
  99         assert(unit_name_is_valid(n));
 100         assert(suffix);
 101
 102         assert_se(e = strrchr(n, '.'));
 103         a = e - n;
 104         b = strlen(suffix);
 105
 106         if (!(r = new(char, a + b + 1)))
 107                 return NULL;
 108
 109         memcpy(r, n, a);
 110         memcpy(r+a, suffix, b+1);
 111
 112         return r;
 113 }
 114
 115 Unit *unit_new(Manager *m) {
 116         Unit *u;
 117
 118         assert(m);
 119
 120         if (!(u = new0(Unit, 1)))
 121                 return NULL;
 122
 123         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
 124                 free(u);
 125                 return NULL;
 126         }
 127
 128         u->meta.manager = m;
 129         u->meta.type = _UNIT_TYPE_INVALID;
 130
 131         return u;
 132 }
 133
 134 bool unit_has_name(Unit *u, const char *name) {
 135         assert(u);
 136         assert(name);
 137
 138         return !!set_get(u->meta.names, (char*) name);
 139 }
 140
 141 int unit_add_name(Unit *u, const char *text) {
 142         UnitType t;
 143         char *s;
 144         int r;
 145
 146         assert(u);
 147         assert(text);
 148
 149         if (!unit_name_is_valid(text))
 150                 return -EINVAL;
 151
 152         if ((t = unit_name_to_type(text)) == _UNIT_TYPE_INVALID)
 153                 return -EINVAL;
 154
 155         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type)
 156                 return -EINVAL;
 157
 158         if (!(s = strdup(text)))
 159                 return -ENOMEM;
 160
 161         if ((r = set_put(u->meta.names, s)) < 0) {
 162                 free(s);
 163
 164                 if (r == -EEXIST)
 165                         return 0;
 166
 167                 return r;
 168         }
 169
 170         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 171                 set_remove(u->meta.names, s);
 172                 free(s);
 173                 return r;
 174         }
 175
 176         if (u->meta.type == _UNIT_TYPE_INVALID)
 177                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 178
 179         u->meta.type = t;
 180
 181         if (!u->meta.id)
 182                 u->meta.id = s;
 183
 184         unit_add_to_dbus_queue(u);
 185         return 0;
 186 }
 187
 188 int unit_choose_id(Unit *u, const char *name) {
 189         char *s;
 190
 191         assert(u);
 192         assert(name);
 193
 194         /* Selects one of the names of this unit as the id */
 195
 196         if (!(s = set_get(u->meta.names, (char*) name)))
 197                 return -ENOENT;
 198
 199         u->meta.id = s;
 200
 201         unit_add_to_dbus_queue(u);
 202         return 0;
 203 }
 204
 205 int unit_set_description(Unit *u, const char *description) {
 206         char *s;
 207
 208         assert(u);
 209
 210         if (!(s = strdup(description)))
 211                 return -ENOMEM;
 212
 213         free(u->meta.description);
 214         u->meta.description = s;
 215
 216         unit_add_to_dbus_queue(u);
 217         return 0;
 218 }
 219
 220 void unit_add_to_load_queue(Unit *u) {
 221         assert(u);
 222         assert(u->meta.type != _UNIT_TYPE_INVALID);
 223
 224         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 225                 return;
 226
 227         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 228         u->meta.in_load_queue = true;
 229 }
 230
 231 void unit_add_to_cleanup_queue(Unit *u) {
 232         assert(u);
 233
 234         if (u->meta.in_cleanup_queue)
 235                 return;
 236
 237         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 238         u->meta.in_cleanup_queue = true;
 239 }
 240
 241 void unit_add_to_dbus_queue(Unit *u) {
 242         assert(u);
 243         assert(u->meta.type != _UNIT_TYPE_INVALID);
 244
 245         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
 246                 return;
 247
 248         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 249         u->meta.in_dbus_queue = true;
 250 }
 251
 252 static void bidi_set_free(Unit *u, Set *s) {
 253         Iterator i;
 254         Unit *other;
 255
 256         assert(u);
 257
 258         /* Frees the set and makes sure we are dropped from the
 259          * inverse pointers */
 260
 261         SET_FOREACH(other, s, i) {
 262                 UnitDependency d;
 263
 264                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 265                         set_remove(other->meta.dependencies[d], u);
 266         }
 267
 268         set_free(s);
 269 }
 270
 271 void unit_free(Unit *u) {
 272         UnitDependency d;
 273         Iterator i;
 274         char *t;
 275
 276         assert(u);
 277
 278         bus_unit_send_removed_signal(u);
 279
 280         /* Detach from next 'bigger' objects */
 281
 282         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 283
 284         SET_FOREACH(t, u->meta.names, i)
 285                 hashmap_remove_value(u->meta.manager->units, t, u);
 286
 287         if (u->meta.type != _UNIT_TYPE_INVALID)
 288                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 289
 290         if (u->meta.in_load_queue)
 291                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 292
 293         if (u->meta.in_dbus_queue)
 294                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 295
 296         if (u->meta.in_cleanup_queue)
 297                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 298
 299         if (u->meta.load_state != UNIT_STUB)
 300                 if (UNIT_VTABLE(u)->done)
 301                         UNIT_VTABLE(u)->done(u);
 302
 303         /* Free data and next 'smaller' objects */
 304         if (u->meta.job)
 305                 job_free(u->meta.job);
 306
 307         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 308                 bidi_set_free(u, u->meta.dependencies[d]);
 309
 310         free(u->meta.description);
 311         free(u->meta.fragment_path);
 312
 313         while ((t = set_steal_first(u->meta.names)))
 314                 free(t);
 315         set_free(u->meta.names);
 316
 317         free(u);
 318 }
 319
 320 UnitActiveState unit_active_state(Unit *u) {
 321         assert(u);
 322
 323         if (u->meta.load_state != UNIT_LOADED)
 324                 return UNIT_INACTIVE;
 325
 326         return UNIT_VTABLE(u)->active_state(u);
 327 }
 328
 329 static void complete_move(Set **s, Set **other) {
 330         assert(s);
 331         assert(other);
 332
 333         if (!*other)
 334                 return;
 335
 336         if (*s)
 337                 set_move(*s, *other);
 338         else {
 339                 *s = *other;
 340                 *other = NULL;
 341         }
 342 }
 343
 344 static void merge_names(Unit *u, Unit *other) {
 345         char *t;
 346         Iterator i;
 347
 348         assert(u);
 349         assert(other);
 350
 351         complete_move(&u->meta.names, &other->meta.names);
 352
 353         while ((t = set_steal_first(other->meta.names)))
 354                 free(t);
 355
 356         set_free(other->meta.names);
 357         other->meta.names = NULL;
 358         other->meta.id = NULL;
 359
 360         SET_FOREACH(t, u->meta.names, i)
 361                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 362 }
 363
 364 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 365         Iterator i;
 366         Unit *back;
 367         int r;
 368
 369         assert(u);
 370         assert(other);
 371         assert(d < _UNIT_DEPENDENCY_MAX);
 372
 373         SET_FOREACH(back, other->meta.dependencies[d], i) {
 374                 UnitDependency k;
 375
 376                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 377                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 378
 379                                 if (r == -EEXIST)
 380                                         set_remove(back->meta.dependencies[k], other);
 381                                 else
 382                                         assert(r == -ENOENT);
 383                         }
 384         }
 385
 386         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 387
 388         set_free(other->meta.dependencies[d]);
 389         other->meta.dependencies[d] = NULL;
 390 }
 391
 392 int unit_merge(Unit *u, Unit *other) {
 393         UnitDependency d;
 394
 395         assert(u);
 396         assert(other);
 397         assert(u->meta.manager == other->meta.manager);
 398
 399         other = unit_follow_merge(other);
 400
 401         if (other == u)
 402                 return 0;
 403
 404         /* This merges 'other' into 'unit'. FIXME: This does not
 405          * rollback on failure. */
 406
 407         if (u->meta.type != u->meta.type)
 408                 return -EINVAL;
 409
 410         if (other->meta.load_state != UNIT_STUB &&
 411             other->meta.load_state != UNIT_FAILED)
 412                 return -EEXIST;
 413
 414         if (other->meta.job)
 415                 return -EEXIST;
 416
 417         if (unit_active_state(other) != UNIT_INACTIVE)
 418                 return -EEXIST;
 419
 420         /* Merge names */
 421         merge_names(u, other);
 422
 423         /* Merge dependencies */
 424         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 425                 merge_dependencies(u, other, d);
 426
 427         other->meta.load_state = UNIT_MERGED;
 428         other->meta.merged_into = u;
 429
 430         /* If there is still some data attached to the other node, we
 431          * don't need it anymore, and can free it. */
 432         if (other->meta.load_state != UNIT_STUB)
 433                 if (UNIT_VTABLE(other)->done)
 434                         UNIT_VTABLE(other)->done(other);
 435
 436         unit_add_to_dbus_queue(u);
 437         unit_add_to_cleanup_queue(other);
 438
 439         return 0;
 440 }
 441
 442 int unit_merge_by_name(Unit *u, const char *name) {
 443         Unit *other;
 444
 445         assert(u);
 446         assert(name);
 447
 448         if (!(other = manager_get_unit(u->meta.manager, name)))
 449                 return unit_add_name(u, name);
 450
 451         return unit_merge(u, other);
 452 }
 453
 454 Unit* unit_follow_merge(Unit *u) {
 455         assert(u);
 456
 457         while (u->meta.load_state == UNIT_MERGED)
 458                 assert_se(u = u->meta.merged_into);
 459
 460         return u;
 461 }
 462
 463 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 464         int r;
 465
 466         assert(u);
 467         assert(c);
 468
 469         if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG)
 470                 return 0;
 471
 472         /* If syslog or kernel logging is requested, make sure our own
 473          * logging daemon is run first. */
 474
 475         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
 476                 return r;
 477
 478         if (u->meta.manager->running_as != MANAGER_SESSION)
 479                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
 480                         return r;
 481
 482         return 0;
 483 }
 484
 485 const char* unit_id(Unit *u) {
 486         assert(u);
 487
 488         if (u->meta.id)
 489                 return u->meta.id;
 490
 491         return set_first(u->meta.names);
 492 }
 493
 494 const char *unit_description(Unit *u) {
 495         assert(u);
 496
 497         if (u->meta.description)
 498                 return u->meta.description;
 499
 500         return unit_id(u);
 501 }
 502
 503 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 504         char *t;
 505         UnitDependency d;
 506         Iterator i;
 507         char *p2;
 508         const char *prefix2;
 509         CGroupBonding *b;
 510         char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
 511
 512         assert(u);
 513
 514         if (!prefix)
 515                 prefix = "";
 516         p2 = strappend(prefix, "\t");
 517         prefix2 = p2 ? p2 : prefix;
 518
 519         fprintf(f,
 520                 "%s→ Unit %s:\n"
 521                 "%s\tDescription: %s\n"
 522                 "%s\tUnit Load State: %s\n"
 523                 "%s\tUnit Active State: %s\n"
 524                 "%s\tActive Enter Timestamp: %s\n"
 525                 "%s\tActive Exit Timestamp: %s\n",
 526                 prefix, unit_id(u),
 527                 prefix, unit_description(u),
 528                 prefix, unit_load_state_to_string(u->meta.load_state),
 529                 prefix, unit_active_state_to_string(unit_active_state(u)),
 530                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
 531                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)));
 532
 533         SET_FOREACH(t, u->meta.names, i)
 534                 fprintf(f, "%s\tName: %s\n", prefix, t);
 535
 536         if (u->meta.fragment_path)
 537                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 538
 539         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 540                 Unit *other;
 541
 542                 if (set_isempty(u->meta.dependencies[d]))
 543                         continue;
 544
 545                 SET_FOREACH(other, u->meta.dependencies[d], i)
 546                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 547         }
 548
 549         fprintf(f,
 550                 "%s\tRecursive Stop: %s\n"
 551                 "%s\tStop When Unneeded: %s\n",
 552                 prefix, yes_no(u->meta.recursive_stop),
 553                 prefix, yes_no(u->meta.stop_when_unneeded));
 554
 555         if (u->meta.load_state == UNIT_LOADED) {
 556                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 557                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 558                                 prefix, b->controller, b->path);
 559
 560                 if (UNIT_VTABLE(u)->dump)
 561                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 562         }
 563
 564         if (u->meta.job)
 565                 job_dump(u->meta.job, f, prefix2);
 566
 567         free(p2);
 568 }
 569
 570 /* Common implementation for multiple backends */
 571 int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) {
 572         int r;
 573
 574         assert(u);
 575         assert(new_state);
 576         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 577
 578         /* Load a .service file */
 579         if ((r = unit_load_fragment(u, new_state)) < 0)
 580                 return r;
 581
 582         if (*new_state == UNIT_STUB)
 583                 return -ENOENT;
 584
 585         /* Load drop-in directory data */
 586         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 587                 return r;
 588
 589         return 0;
 590 }
 591
 592 /* Common implementation for multiple backends */
 593 int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) {
 594         int r;
 595
 596         assert(u);
 597         assert(new_state);
 598         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 599
 600         /* Same as unit_load_fragment_and_dropin(), but whether
 601          * something can be loaded or not doesn't matter. */
 602
 603         /* Load a .service file */
 604         if ((r = unit_load_fragment(u, new_state)) < 0)
 605                 return r;
 606
 607         if (*new_state == UNIT_STUB)
 608                 *new_state = UNIT_LOADED;
 609
 610         /* Load drop-in directory data */
 611         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 612                 return r;
 613
 614         return 0;
 615 }
 616
 617 int unit_load(Unit *u) {
 618         int r;
 619         UnitLoadState res;
 620
 621         assert(u);
 622
 623         if (u->meta.in_load_queue) {
 624                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 625                 u->meta.in_load_queue = false;
 626         }
 627
 628         if (u->meta.load_state != UNIT_STUB)
 629                 return 0;
 630
 631         if (UNIT_VTABLE(u)->init) {
 632                 res = UNIT_STUB;
 633                 if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0)
 634                         goto fail;
 635         }
 636
 637         if (res == UNIT_STUB) {
 638                 r = -ENOENT;
 639                 goto fail;
 640         }
 641
 642         u->meta.load_state = res;
 643         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 644
 645         unit_add_to_dbus_queue(unit_follow_merge(u));
 646
 647         return 0;
 648
 649 fail:
 650         u->meta.load_state = UNIT_FAILED;
 651         unit_add_to_dbus_queue(u);
 652
 653         log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r));
 654
 655         return r;
 656 }
 657
 658 /* Errors:
 659  *         -EBADR:    This unit type does not support starting.
 660  *         -EALREADY: Unit is already started.
 661  *         -EAGAIN:   An operation is already in progress. Retry later.
 662  */
 663 int unit_start(Unit *u) {
 664         UnitActiveState state;
 665
 666         assert(u);
 667
 668         /* If this is already (being) started, then this will
 669          * succeed. Note that this will even succeed if this unit is
 670          * not startable by the user. This is relied on to detect when
 671          * we need to wait for units and when waiting is finished. */
 672         state = unit_active_state(u);
 673         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 674                 return -EALREADY;
 675
 676         /* If it is stopped, but we cannot start it, then fail */
 677         if (!UNIT_VTABLE(u)->start)
 678                 return -EBADR;
 679
 680         /* We don't suppress calls to ->start() here when we are
 681          * already starting, to allow this request to be used as a
 682          * "hurry up" call, for example when the unit is in some "auto
 683          * restart" state where it waits for a holdoff timer to elapse
 684          * before it will start again. */
 685
 686         unit_add_to_dbus_queue(u);
 687         return UNIT_VTABLE(u)->start(u);
 688 }
 689
 690 bool unit_can_start(Unit *u) {
 691         assert(u);
 692
 693         return !!UNIT_VTABLE(u)->start;
 694 }
 695
 696 /* Errors:
 697  *         -EBADR:    This unit type does not support stopping.
 698  *         -EALREADY: Unit is already stopped.
 699  *         -EAGAIN:   An operation is already in progress. Retry later.
 700  */
 701 int unit_stop(Unit *u) {
 702         UnitActiveState state;
 703
 704         assert(u);
 705
 706         state = unit_active_state(u);
 707         if (state == UNIT_INACTIVE)
 708                 return -EALREADY;
 709
 710         if (!UNIT_VTABLE(u)->stop)
 711                 return -EBADR;
 712
 713         if (state == UNIT_DEACTIVATING)
 714                 return 0;
 715
 716         unit_add_to_dbus_queue(u);
 717         return UNIT_VTABLE(u)->stop(u);
 718 }
 719
 720 /* Errors:
 721  *         -EBADR:    This unit type does not support reloading.
 722  *         -ENOEXEC:  Unit is not started.
 723  *         -EAGAIN:   An operation is already in progress. Retry later.
 724  */
 725 int unit_reload(Unit *u) {
 726         UnitActiveState state;
 727
 728         assert(u);
 729
 730         if (!unit_can_reload(u))
 731                 return -EBADR;
 732
 733         state = unit_active_state(u);
 734         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 735                 return -EALREADY;
 736
 737         if (unit_active_state(u) != UNIT_ACTIVE)
 738                 return -ENOEXEC;
 739
 740         unit_add_to_dbus_queue(u);
 741         return UNIT_VTABLE(u)->reload(u);
 742 }
 743
 744 bool unit_can_reload(Unit *u) {
 745         assert(u);
 746
 747         if (!UNIT_VTABLE(u)->reload)
 748                 return false;
 749
 750         if (!UNIT_VTABLE(u)->can_reload)
 751                 return true;
 752
 753         return UNIT_VTABLE(u)->can_reload(u);
 754 }
 755
 756 static void unit_check_uneeded(Unit *u) {
 757         Iterator i;
 758         Unit *other;
 759
 760         assert(u);
 761
 762         /* If this service shall be shut down when unneeded then do
 763          * so. */
 764
 765         if (!u->meta.stop_when_unneeded)
 766                 return;
 767
 768         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 769                 return;
 770
 771         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 772                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 773                         return;
 774
 775         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 776                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 777                         return;
 778
 779         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 780                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 781                         return;
 782
 783         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 784
 785         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 786         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 787 }
 788
 789 static void retroactively_start_dependencies(Unit *u) {
 790         Iterator i;
 791         Unit *other;
 792
 793         assert(u);
 794         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 795
 796         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 797                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 798                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 799
 800         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 801                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 802                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 803
 804         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 805                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 806                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 807
 808         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 809                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 810                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 811
 812         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 813                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 814                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 815 }
 816
 817 static void retroactively_stop_dependencies(Unit *u) {
 818         Iterator i;
 819         Unit *other;
 820
 821         assert(u);
 822         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 823
 824         if (u->meta.recursive_stop) {
 825                 /* Pull down units need us recursively if enabled */
 826                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 827                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 828                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 829         }
 830
 831         /* Garbage collect services that might not be needed anymore, if enabled */
 832         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 833                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 834                         unit_check_uneeded(other);
 835         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 836                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 837                         unit_check_uneeded(other);
 838         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 839                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 840                         unit_check_uneeded(other);
 841         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 842                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 843                         unit_check_uneeded(other);
 844         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
 845                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 846                         unit_check_uneeded(other);
 847 }
 848
 849 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 850         bool unexpected = false;
 851
 852         assert(u);
 853         assert(os < _UNIT_ACTIVE_STATE_MAX);
 854         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 855         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 856         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 857
 858         if (os == ns)
 859                 return;
 860
 861         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 862                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 863         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 864                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 865
 866         if (u->meta.job) {
 867
 868                 if (u->meta.job->state == JOB_WAITING)
 869
 870                         /* So we reached a different state for this
 871                          * job. Let's see if we can run it now if it
 872                          * failed previously due to EAGAIN. */
 873                         job_add_to_run_queue(u->meta.job);
 874
 875                 else {
 876                         assert(u->meta.job->state == JOB_RUNNING);
 877
 878                         /* Let's check whether this state change
 879                          * constitutes a finished job, or maybe
 880                          * cotradicts a running job and hence needs to
 881                          * invalidate jobs. */
 882
 883                         switch (u->meta.job->type) {
 884
 885                         case JOB_START:
 886                         case JOB_VERIFY_ACTIVE:
 887
 888                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
 889                                         job_finish_and_invalidate(u->meta.job, true);
 890                                 else if (ns != UNIT_ACTIVATING) {
 891                                         unexpected = true;
 892                                         job_finish_and_invalidate(u->meta.job, false);
 893                                 }
 894
 895                                 break;
 896
 897                         case JOB_RELOAD:
 898                         case JOB_RELOAD_OR_START:
 899
 900                                 if (ns == UNIT_ACTIVE)
 901                                         job_finish_and_invalidate(u->meta.job, true);
 902                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
 903                                         unexpected = true;
 904                                         job_finish_and_invalidate(u->meta.job, false);
 905                                 }
 906
 907                                 break;
 908
 909                         case JOB_STOP:
 910                         case JOB_RESTART:
 911                         case JOB_TRY_RESTART:
 912
 913                                 if (ns == UNIT_INACTIVE)
 914                                         job_finish_and_invalidate(u->meta.job, true);
 915                                 else if (ns != UNIT_DEACTIVATING) {
 916                                         unexpected = true;
 917                                         job_finish_and_invalidate(u->meta.job, false);
 918                                 }
 919
 920                                 break;
 921
 922                         default:
 923                                 assert_not_reached("Job type unknown");
 924                         }
 925                 }
 926         }
 927
 928         /* If this state change happened without being requested by a
 929          * job, then let's retroactively start or stop dependencies */
 930
 931         if (unexpected) {
 932                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 933                         retroactively_start_dependencies(u);
 934                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 935                         retroactively_stop_dependencies(u);
 936         }
 937
 938         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 939
 940                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
 941                         log_info("D-Bus became available, trying to reconnect.");
 942                         /* The bus just got started, hence try to connect to it. */
 943                         bus_init_system(u->meta.manager);
 944                         bus_init_api(u->meta.manager);
 945                 }
 946
 947                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) {
 948                         /* The syslog daemon just got started, hence try to connect to it. */
 949                         log_info("Syslog became available, trying to reconnect.");
 950                         log_open_syslog();
 951                 }
 952
 953         } else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 954
 955                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 956                         /* The syslog daemon just got terminated, hence try to disconnect from it. */
 957                         log_close_syslog();
 958
 959                 /* We don't care about D-Bus here, since we'll get an
 960                  * asynchronous notification for it anyway. */
 961         }
 962
 963         /* Maybe we finished startup and are now ready for being
 964          * stopped because unneeded? */
 965         unit_check_uneeded(u);
 966
 967         unit_add_to_dbus_queue(u);
 968 }
 969
 970 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 971         struct epoll_event ev;
 972
 973         assert(u);
 974         assert(fd >= 0);
 975         assert(w);
 976         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 977
 978         zero(ev);
 979         ev.data.ptr = w;
 980         ev.events = events;
 981
 982         if (epoll_ctl(u->meta.manager->epoll_fd,
 983                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 984                       fd,
 985                       &ev) < 0)
 986                 return -errno;
 987
 988         w->fd = fd;
 989         w->type = WATCH_FD;
 990         w->data.unit = u;
 991
 992         return 0;
 993 }
 994
 995 void unit_unwatch_fd(Unit *u, Watch *w) {
 996         assert(u);
 997         assert(w);
 998
 999         if (w->type == WATCH_INVALID)
1000                 return;
1001
1002         assert(w->type == WATCH_FD);
1003         assert(w->data.unit == u);
1004         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1005
1006         w->fd = -1;
1007         w->type = WATCH_INVALID;
1008         w->data.unit = NULL;
1009 }
1010
1011 int unit_watch_pid(Unit *u, pid_t pid) {
1012         assert(u);
1013         assert(pid >= 1);
1014
1015         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1016 }
1017
1018 void unit_unwatch_pid(Unit *u, pid_t pid) {
1019         assert(u);
1020         assert(pid >= 1);
1021
1022         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
1023 }
1024
1025 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1026         struct itimerspec its;
1027         int flags, fd;
1028         bool ours;
1029
1030         assert(u);
1031         assert(w);
1032         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1033
1034         /* This will try to reuse the old timer if there is one */
1035
1036         if (w->type == WATCH_TIMER) {
1037                 ours = false;
1038                 fd = w->fd;
1039         } else {
1040                 ours = true;
1041                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1042                         return -errno;
1043         }
1044
1045         zero(its);
1046
1047         if (delay <= 0) {
1048                 /* Set absolute time in the past, but not 0, since we
1049                  * don't want to disarm the timer */
1050                 its.it_value.tv_sec = 0;
1051                 its.it_value.tv_nsec = 1;
1052
1053                 flags = TFD_TIMER_ABSTIME;
1054         } else {
1055                 timespec_store(&its.it_value, delay);
1056                 flags = 0;
1057         }
1058
1059         /* This will also flush the elapse counter */
1060         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1061                 goto fail;
1062
1063         if (w->type == WATCH_INVALID) {
1064                 struct epoll_event ev;
1065
1066                 zero(ev);
1067                 ev.data.ptr = w;
1068                 ev.events = EPOLLIN;
1069
1070                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1071                         goto fail;
1072         }
1073
1074         w->fd = fd;
1075         w->type = WATCH_TIMER;
1076         w->data.unit = u;
1077
1078         return 0;
1079
1080 fail:
1081         if (ours)
1082                 close_nointr_nofail(fd);
1083
1084         return -errno;
1085 }
1086
1087 void unit_unwatch_timer(Unit *u, Watch *w) {
1088         assert(u);
1089         assert(w);
1090
1091         if (w->type == WATCH_INVALID)
1092                 return;
1093
1094         assert(w->type == WATCH_TIMER && w->data.unit == u);
1095
1096         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1097         assert_se(close_nointr(w->fd) == 0);
1098
1099         w->fd = -1;
1100         w->type = WATCH_INVALID;
1101         w->data.unit = NULL;
1102 }
1103
1104 bool unit_job_is_applicable(Unit *u, JobType j) {
1105         assert(u);
1106         assert(j >= 0 && j < _JOB_TYPE_MAX);
1107
1108         switch (j) {
1109
1110         case JOB_VERIFY_ACTIVE:
1111         case JOB_START:
1112                 return true;
1113
1114         case JOB_STOP:
1115         case JOB_RESTART:
1116         case JOB_TRY_RESTART:
1117                 return unit_can_start(u);
1118
1119         case JOB_RELOAD:
1120                 return unit_can_reload(u);
1121
1122         case JOB_RELOAD_OR_START:
1123                 return unit_can_reload(u) && unit_can_start(u);
1124
1125         default:
1126                 assert_not_reached("Invalid job type");
1127         }
1128 }
1129
1130 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1131
1132         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1133                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1134                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1135                 [UNIT_WANTS] = UNIT_WANTED_BY,
1136                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1137                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1138                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1139                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1140                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1141                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1142                 [UNIT_BEFORE] = UNIT_AFTER,
1143                 [UNIT_AFTER] = UNIT_BEFORE
1144         };
1145         int r;
1146
1147         assert(u);
1148         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1149         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1150         assert(other);
1151
1152         /* We won't allow dependencies on ourselves. We will not
1153          * consider them an error however. */
1154         if (u == other)
1155                 return 0;
1156
1157         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1158                 return r;
1159
1160         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1161                 return r;
1162
1163         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1164                 return r;
1165
1166         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1167                 set_remove(u->meta.dependencies[d], other);
1168                 return r;
1169         }
1170
1171         unit_add_to_dbus_queue(u);
1172         return 0;
1173 }
1174
1175 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
1176         Unit *other;
1177         int r;
1178
1179         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1180                 return r;
1181
1182         if ((r = unit_add_dependency(u, d, other)) < 0)
1183                 return r;
1184
1185         return 0;
1186 }
1187
1188 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1189         Unit *other;
1190         int r;
1191
1192         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1193                 return r;
1194
1195         if ((r = unit_add_dependency(other, d, u)) < 0)
1196                 return r;
1197
1198         return 0;
1199 }
1200
1201 int set_unit_path(const char *p) {
1202         char *cwd, *c;
1203         int r;
1204
1205         /* This is mostly for debug purposes */
1206
1207         if (path_is_absolute(p)) {
1208                 if (!(c = strdup(p)))
1209                         return -ENOMEM;
1210         } else {
1211                 if (!(cwd = get_current_dir_name()))
1212                         return -errno;
1213
1214                 r = asprintf(&c, "%s/%s", cwd, p);
1215                 free(cwd);
1216
1217                 if (r < 0)
1218                         return -ENOMEM;
1219         }
1220
1221         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1222                 r = -errno;
1223                 free(c);
1224                 return r;
1225         }
1226
1227         return 0;
1228 }
1229
1230 char *unit_name_escape_path(const char *path, const char *suffix) {
1231         char *r, *t;
1232         const char *f;
1233         size_t a, b;
1234
1235         assert(path);
1236
1237         /* Takes a path and a suffix and prefix and makes a nice
1238          * string suitable as unit name of it, escaping all weird
1239          * chars on the way.
1240          *
1241          * / becomes ., and all chars not alloweed in a unit name get
1242          * escaped as \xFF, including \ and ., of course. This
1243          * escaping is hence reversible.
1244          */
1245
1246         if (!suffix)
1247                 suffix = "";
1248
1249         a = strlen(path);
1250         b = strlen(suffix);
1251
1252         if (!(r = new(char, a*4+b+1)))
1253                 return NULL;
1254
1255         for (f = path, t = r; *f; f++) {
1256                 if (*f == '/')
1257                         *(t++) = '.';
1258                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1259                         *(t++) = '\\';
1260                         *(t++) = 'x';
1261                         *(t++) = hexchar(*f > 4);
1262                         *(t++) = hexchar(*f);
1263                 } else
1264                         *(t++) = *f;
1265         }
1266
1267         memcpy(t, suffix, b+1);
1268
1269         return r;
1270 }
1271
1272 char *unit_dbus_path(Unit *u) {
1273         char *p, *e;
1274
1275         assert(u);
1276
1277         if (!(e = bus_path_escape(unit_id(u))))
1278                 return NULL;
1279
1280         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1281                 free(e);
1282                 return NULL;
1283         }
1284
1285         free(e);
1286         return p;
1287 }
1288
1289 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1290         CGroupBonding *l;
1291         int r;
1292
1293         assert(u);
1294         assert(b);
1295         assert(b->path);
1296
1297         /* Ensure this hasn't been added yet */
1298         assert(!b->unit);
1299
1300         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1301         LIST_PREPEND(CGroupBonding, by_path, l, b);
1302
1303         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1304                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1305                 return r;
1306         }
1307
1308         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1309         b->unit = u;
1310
1311         return 0;
1312 }
1313
1314 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1315         size_t n;
1316         const char *p;
1317         char *controller;
1318         CGroupBonding *b;
1319         int r;
1320
1321         assert(u);
1322         assert(name);
1323
1324         /* Detect controller name */
1325         n = strcspn(name, ":/");
1326
1327         /* Only controller name, no path? No path? */
1328         if (name[n] == 0)
1329                 return -EINVAL;
1330
1331         if (n > 0) {
1332                 if (name[n] != ':')
1333                         return -EINVAL;
1334
1335                 p = name+n+1;
1336         } else
1337                 p = name;
1338
1339         /* Insist in absolute paths */
1340         if (p[0] != '/')
1341                 return -EINVAL;
1342
1343         if (!(controller = strndup(name, n)))
1344                 return -ENOMEM;
1345
1346         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1347                 free(controller);
1348                 return -EEXIST;
1349         }
1350
1351         if (!(b = new0(CGroupBonding, 1))) {
1352                 free(controller);
1353                 return -ENOMEM;
1354         }
1355
1356         b->controller = controller;
1357
1358         if (!(b->path = strdup(p))) {
1359                 r = -ENOMEM;
1360                 goto fail;
1361         }
1362
1363         b->only_us = false;
1364         b->clean_up = false;
1365
1366         if ((r = unit_add_cgroup(u, b)) < 0)
1367                 goto fail;
1368
1369         return 0;
1370
1371 fail:
1372         free(b->path);
1373         free(b->controller);
1374         free(b);
1375
1376         return r;
1377 }
1378
1379 int unit_add_default_cgroup(Unit *u) {
1380         CGroupBonding *b;
1381         int r = -ENOMEM;
1382
1383         assert(u);
1384
1385         /* Adds in the default cgroup data, if it wasn't specified yet */
1386
1387         if (unit_get_default_cgroup(u))
1388                 return 0;
1389
1390         if (!(b = new0(CGroupBonding, 1)))
1391                 return -ENOMEM;
1392
1393         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1394                 goto fail;
1395
1396         if (asprintf(&b->path, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1397                 goto fail;
1398
1399         b->clean_up = true;
1400         b->only_us = true;
1401
1402         if ((r = unit_add_cgroup(u, b)) < 0)
1403                 goto fail;
1404
1405         return 0;
1406
1407 fail:
1408         free(b->path);
1409         free(b->controller);
1410         free(b);
1411
1412         return r;
1413 }
1414
1415 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1416         assert(u);
1417
1418         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1419 }
1420
1421 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1422         [UNIT_SERVICE] = "service",
1423         [UNIT_TIMER] = "timer",
1424         [UNIT_SOCKET] = "socket",
1425         [UNIT_TARGET] = "target",
1426         [UNIT_DEVICE] = "device",
1427         [UNIT_MOUNT] = "mount",
1428         [UNIT_AUTOMOUNT] = "automount",
1429         [UNIT_SNAPSHOT] = "snapshot"
1430 };
1431
1432 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1433
1434 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1435         [UNIT_STUB] = "stub",
1436         [UNIT_LOADED] = "loaded",
1437         [UNIT_FAILED] = "failed",
1438         [UNIT_MERGED] = "merged"
1439 };
1440
1441 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1442
1443 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1444         [UNIT_ACTIVE] = "active",
1445         [UNIT_INACTIVE] = "inactive",
1446         [UNIT_ACTIVATING] = "activating",
1447         [UNIT_DEACTIVATING] = "deactivating"
1448 };
1449
1450 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1451
1452 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1453         [UNIT_REQUIRES] = "Requires",
1454         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1455         [UNIT_WANTS] = "Wants",
1456         [UNIT_REQUISITE] = "Requisite",
1457         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1458         [UNIT_REQUIRED_BY] = "RequiredBy",
1459         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1460         [UNIT_WANTED_BY] = "WantedBy",
1461         [UNIT_CONFLICTS] = "Conflicts",
1462         [UNIT_BEFORE] = "Before",
1463         [UNIT_AFTER] = "After",
1464 };
1465
1466 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1467
1468 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1469         [KILL_PROCESS] = "process",
1470         [KILL_PROCESS_GROUP] = "process-group",
1471         [KILL_CONTROL_GROUP] = "control-group"
1472 };
1473
1474 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);