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                 SET_FOREACH(other, u->meta.dependencies[d], i)
 543                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 544         }
 545
 546         if (u->meta.load_state == UNIT_LOADED) {
 547                 fprintf(f,
 548                         "%s\tRecursive Stop: %s\n"
 549                         "%s\tStop When Unneeded: %s\n",
 550                         prefix, yes_no(u->meta.recursive_stop),
 551                         prefix, yes_no(u->meta.stop_when_unneeded));
 552
 553                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 554                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 555                                 prefix, b->controller, b->path);
 556
 557                 if (UNIT_VTABLE(u)->dump)
 558                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 559
 560         } else if (u->meta.load_state == UNIT_MERGED)
 561                 fprintf(f,
 562                         "%s\tMerged into: %s\n",
 563                         prefix, unit_id(u->meta.merged_into));
 564
 565         if (u->meta.job)
 566                 job_dump(u->meta.job, f, prefix2);
 567
 568         free(p2);
 569 }
 570
 571 /* Common implementation for multiple backends */
 572 int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) {
 573         int r;
 574
 575         assert(u);
 576         assert(new_state);
 577         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 578
 579         /* Load a .service file */
 580         if ((r = unit_load_fragment(u, new_state)) < 0)
 581                 return r;
 582
 583         if (*new_state == UNIT_STUB)
 584                 return -ENOENT;
 585
 586         /* Load drop-in directory data */
 587         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 588                 return r;
 589
 590         return 0;
 591 }
 592
 593 /* Common implementation for multiple backends */
 594 int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) {
 595         int r;
 596
 597         assert(u);
 598         assert(new_state);
 599         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 600
 601         /* Same as unit_load_fragment_and_dropin(), but whether
 602          * something can be loaded or not doesn't matter. */
 603
 604         /* Load a .service file */
 605         if ((r = unit_load_fragment(u, new_state)) < 0)
 606                 return r;
 607
 608         if (*new_state == UNIT_STUB)
 609                 *new_state = UNIT_LOADED;
 610
 611         /* Load drop-in directory data */
 612         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 613                 return r;
 614
 615         return 0;
 616 }
 617
 618 int unit_load(Unit *u) {
 619         int r;
 620         UnitLoadState res;
 621
 622         assert(u);
 623
 624         if (u->meta.in_load_queue) {
 625                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 626                 u->meta.in_load_queue = false;
 627         }
 628
 629         if (u->meta.load_state != UNIT_STUB)
 630                 return 0;
 631
 632         if (UNIT_VTABLE(u)->init) {
 633                 res = UNIT_STUB;
 634                 if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0)
 635                         goto fail;
 636         }
 637
 638         if (res == UNIT_STUB) {
 639                 r = -ENOENT;
 640                 goto fail;
 641         }
 642
 643         u->meta.load_state = res;
 644         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 645
 646         unit_add_to_dbus_queue(unit_follow_merge(u));
 647
 648         return 0;
 649
 650 fail:
 651         u->meta.load_state = UNIT_FAILED;
 652         unit_add_to_dbus_queue(u);
 653
 654         log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r));
 655
 656         return r;
 657 }
 658
 659 /* Errors:
 660  *         -EBADR:    This unit type does not support starting.
 661  *         -EALREADY: Unit is already started.
 662  *         -EAGAIN:   An operation is already in progress. Retry later.
 663  */
 664 int unit_start(Unit *u) {
 665         UnitActiveState state;
 666
 667         assert(u);
 668
 669         /* If this is already (being) started, then this will
 670          * succeed. Note that this will even succeed if this unit is
 671          * not startable by the user. This is relied on to detect when
 672          * we need to wait for units and when waiting is finished. */
 673         state = unit_active_state(u);
 674         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 675                 return -EALREADY;
 676
 677         /* If it is stopped, but we cannot start it, then fail */
 678         if (!UNIT_VTABLE(u)->start)
 679                 return -EBADR;
 680
 681         /* We don't suppress calls to ->start() here when we are
 682          * already starting, to allow this request to be used as a
 683          * "hurry up" call, for example when the unit is in some "auto
 684          * restart" state where it waits for a holdoff timer to elapse
 685          * before it will start again. */
 686
 687         unit_add_to_dbus_queue(u);
 688         return UNIT_VTABLE(u)->start(u);
 689 }
 690
 691 bool unit_can_start(Unit *u) {
 692         assert(u);
 693
 694         return !!UNIT_VTABLE(u)->start;
 695 }
 696
 697 /* Errors:
 698  *         -EBADR:    This unit type does not support stopping.
 699  *         -EALREADY: Unit is already stopped.
 700  *         -EAGAIN:   An operation is already in progress. Retry later.
 701  */
 702 int unit_stop(Unit *u) {
 703         UnitActiveState state;
 704
 705         assert(u);
 706
 707         state = unit_active_state(u);
 708         if (state == UNIT_INACTIVE)
 709                 return -EALREADY;
 710
 711         if (!UNIT_VTABLE(u)->stop)
 712                 return -EBADR;
 713
 714         if (state == UNIT_DEACTIVATING)
 715                 return 0;
 716
 717         unit_add_to_dbus_queue(u);
 718         return UNIT_VTABLE(u)->stop(u);
 719 }
 720
 721 /* Errors:
 722  *         -EBADR:    This unit type does not support reloading.
 723  *         -ENOEXEC:  Unit is not started.
 724  *         -EAGAIN:   An operation is already in progress. Retry later.
 725  */
 726 int unit_reload(Unit *u) {
 727         UnitActiveState state;
 728
 729         assert(u);
 730
 731         if (!unit_can_reload(u))
 732                 return -EBADR;
 733
 734         state = unit_active_state(u);
 735         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 736                 return -EALREADY;
 737
 738         if (unit_active_state(u) != UNIT_ACTIVE)
 739                 return -ENOEXEC;
 740
 741         unit_add_to_dbus_queue(u);
 742         return UNIT_VTABLE(u)->reload(u);
 743 }
 744
 745 bool unit_can_reload(Unit *u) {
 746         assert(u);
 747
 748         if (!UNIT_VTABLE(u)->reload)
 749                 return false;
 750
 751         if (!UNIT_VTABLE(u)->can_reload)
 752                 return true;
 753
 754         return UNIT_VTABLE(u)->can_reload(u);
 755 }
 756
 757 static void unit_check_uneeded(Unit *u) {
 758         Iterator i;
 759         Unit *other;
 760
 761         assert(u);
 762
 763         /* If this service shall be shut down when unneeded then do
 764          * so. */
 765
 766         if (!u->meta.stop_when_unneeded)
 767                 return;
 768
 769         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 770                 return;
 771
 772         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 773                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 774                         return;
 775
 776         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 777                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 778                         return;
 779
 780         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 781                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 782                         return;
 783
 784         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 785
 786         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 787         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 788 }
 789
 790 static void retroactively_start_dependencies(Unit *u) {
 791         Iterator i;
 792         Unit *other;
 793
 794         assert(u);
 795         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 796
 797         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 798                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 799                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 800
 801         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 802                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 803                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 804
 805         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 806                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 807                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 808
 809         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 810                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 811                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 812
 813         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 814                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 815                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 816 }
 817
 818 static void retroactively_stop_dependencies(Unit *u) {
 819         Iterator i;
 820         Unit *other;
 821
 822         assert(u);
 823         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 824
 825         if (u->meta.recursive_stop) {
 826                 /* Pull down units need us recursively if enabled */
 827                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 828                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 829                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 830         }
 831
 832         /* Garbage collect services that might not be needed anymore, if enabled */
 833         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 834                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 835                         unit_check_uneeded(other);
 836         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 837                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 838                         unit_check_uneeded(other);
 839         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 840                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 841                         unit_check_uneeded(other);
 842         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 843                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 844                         unit_check_uneeded(other);
 845         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
 846                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 847                         unit_check_uneeded(other);
 848 }
 849
 850 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 851         bool unexpected = false;
 852
 853         assert(u);
 854         assert(os < _UNIT_ACTIVE_STATE_MAX);
 855         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 856         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 857         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 858
 859         /* Note that this is called for all low-level state changes,
 860          * even if they might map to the same high-level
 861          * UnitActiveState! That means that ns == os is OK an expected
 862          * behaviour here. For example: if a mount point is remounted
 863          * this function will be called too and the utmp code below
 864          * relies on that! */
 865
 866         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 867                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 868         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 869                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 870
 871         if (u->meta.job) {
 872
 873                 if (u->meta.job->state == JOB_WAITING)
 874
 875                         /* So we reached a different state for this
 876                          * job. Let's see if we can run it now if it
 877                          * failed previously due to EAGAIN. */
 878                         job_add_to_run_queue(u->meta.job);
 879
 880                 else {
 881                         assert(u->meta.job->state == JOB_RUNNING);
 882
 883                         /* Let's check whether this state change
 884                          * constitutes a finished job, or maybe
 885                          * cotradicts a running job and hence needs to
 886                          * invalidate jobs. */
 887
 888                         switch (u->meta.job->type) {
 889
 890                         case JOB_START:
 891                         case JOB_VERIFY_ACTIVE:
 892
 893                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
 894                                         job_finish_and_invalidate(u->meta.job, true);
 895                                 else if (ns != UNIT_ACTIVATING) {
 896                                         unexpected = true;
 897                                         job_finish_and_invalidate(u->meta.job, false);
 898                                 }
 899
 900                                 break;
 901
 902                         case JOB_RELOAD:
 903                         case JOB_RELOAD_OR_START:
 904
 905                                 if (ns == UNIT_ACTIVE)
 906                                         job_finish_and_invalidate(u->meta.job, true);
 907                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
 908                                         unexpected = true;
 909                                         job_finish_and_invalidate(u->meta.job, false);
 910                                 }
 911
 912                                 break;
 913
 914                         case JOB_STOP:
 915                         case JOB_RESTART:
 916                         case JOB_TRY_RESTART:
 917
 918                                 if (ns == UNIT_INACTIVE)
 919                                         job_finish_and_invalidate(u->meta.job, true);
 920                                 else if (ns != UNIT_DEACTIVATING) {
 921                                         unexpected = true;
 922                                         job_finish_and_invalidate(u->meta.job, false);
 923                                 }
 924
 925                                 break;
 926
 927                         default:
 928                                 assert_not_reached("Job type unknown");
 929                         }
 930                 }
 931         }
 932
 933         /* If this state change happened without being requested by a
 934          * job, then let's retroactively start or stop dependencies */
 935
 936         if (unexpected) {
 937                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 938                         retroactively_start_dependencies(u);
 939                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 940                         retroactively_stop_dependencies(u);
 941         }
 942
 943         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 944
 945                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
 946                         log_info("D-Bus became available, trying to reconnect.");
 947                         /* The bus just got started, hence try to connect to it. */
 948                         bus_init_system(u->meta.manager);
 949                         bus_init_api(u->meta.manager);
 950                 }
 951
 952                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) {
 953                         /* The syslog daemon just got started, hence try to connect to it. */
 954                         log_info("Syslog became available, trying to reconnect.");
 955                         log_open_syslog();
 956                 }
 957
 958         } else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 959
 960                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 961                         /* The syslog daemon just got terminated, hence try to disconnect from it. */
 962                         log_close_syslog();
 963
 964                 /* We don't care about D-Bus here, since we'll get an
 965                  * asynchronous notification for it anyway. */
 966         }
 967
 968         /* Maybe we finished startup and are now ready for being
 969          * stopped because unneeded? */
 970         unit_check_uneeded(u);
 971
 972         unit_add_to_dbus_queue(u);
 973 }
 974
 975 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 976         struct epoll_event ev;
 977
 978         assert(u);
 979         assert(fd >= 0);
 980         assert(w);
 981         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 982
 983         zero(ev);
 984         ev.data.ptr = w;
 985         ev.events = events;
 986
 987         if (epoll_ctl(u->meta.manager->epoll_fd,
 988                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 989                       fd,
 990                       &ev) < 0)
 991                 return -errno;
 992
 993         w->fd = fd;
 994         w->type = WATCH_FD;
 995         w->data.unit = u;
 996
 997         return 0;
 998 }
 999
1000 void unit_unwatch_fd(Unit *u, Watch *w) {
1001         assert(u);
1002         assert(w);
1003
1004         if (w->type == WATCH_INVALID)
1005                 return;
1006
1007         assert(w->type == WATCH_FD);
1008         assert(w->data.unit == u);
1009         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1010
1011         w->fd = -1;
1012         w->type = WATCH_INVALID;
1013         w->data.unit = NULL;
1014 }
1015
1016 int unit_watch_pid(Unit *u, pid_t pid) {
1017         assert(u);
1018         assert(pid >= 1);
1019
1020         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1021 }
1022
1023 void unit_unwatch_pid(Unit *u, pid_t pid) {
1024         assert(u);
1025         assert(pid >= 1);
1026
1027         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
1028 }
1029
1030 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1031         struct itimerspec its;
1032         int flags, fd;
1033         bool ours;
1034
1035         assert(u);
1036         assert(w);
1037         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1038
1039         /* This will try to reuse the old timer if there is one */
1040
1041         if (w->type == WATCH_TIMER) {
1042                 ours = false;
1043                 fd = w->fd;
1044         } else {
1045                 ours = true;
1046                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1047                         return -errno;
1048         }
1049
1050         zero(its);
1051
1052         if (delay <= 0) {
1053                 /* Set absolute time in the past, but not 0, since we
1054                  * don't want to disarm the timer */
1055                 its.it_value.tv_sec = 0;
1056                 its.it_value.tv_nsec = 1;
1057
1058                 flags = TFD_TIMER_ABSTIME;
1059         } else {
1060                 timespec_store(&its.it_value, delay);
1061                 flags = 0;
1062         }
1063
1064         /* This will also flush the elapse counter */
1065         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1066                 goto fail;
1067
1068         if (w->type == WATCH_INVALID) {
1069                 struct epoll_event ev;
1070
1071                 zero(ev);
1072                 ev.data.ptr = w;
1073                 ev.events = EPOLLIN;
1074
1075                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1076                         goto fail;
1077         }
1078
1079         w->fd = fd;
1080         w->type = WATCH_TIMER;
1081         w->data.unit = u;
1082
1083         return 0;
1084
1085 fail:
1086         if (ours)
1087                 close_nointr_nofail(fd);
1088
1089         return -errno;
1090 }
1091
1092 void unit_unwatch_timer(Unit *u, Watch *w) {
1093         assert(u);
1094         assert(w);
1095
1096         if (w->type == WATCH_INVALID)
1097                 return;
1098
1099         assert(w->type == WATCH_TIMER && w->data.unit == u);
1100
1101         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1102         assert_se(close_nointr(w->fd) == 0);
1103
1104         w->fd = -1;
1105         w->type = WATCH_INVALID;
1106         w->data.unit = NULL;
1107 }
1108
1109 bool unit_job_is_applicable(Unit *u, JobType j) {
1110         assert(u);
1111         assert(j >= 0 && j < _JOB_TYPE_MAX);
1112
1113         switch (j) {
1114
1115         case JOB_VERIFY_ACTIVE:
1116         case JOB_START:
1117                 return true;
1118
1119         case JOB_STOP:
1120         case JOB_RESTART:
1121         case JOB_TRY_RESTART:
1122                 return unit_can_start(u);
1123
1124         case JOB_RELOAD:
1125                 return unit_can_reload(u);
1126
1127         case JOB_RELOAD_OR_START:
1128                 return unit_can_reload(u) && unit_can_start(u);
1129
1130         default:
1131                 assert_not_reached("Invalid job type");
1132         }
1133 }
1134
1135 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1136
1137         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1138                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1139                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1140                 [UNIT_WANTS] = UNIT_WANTED_BY,
1141                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1142                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1143                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1144                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1145                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1146                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1147                 [UNIT_BEFORE] = UNIT_AFTER,
1148                 [UNIT_AFTER] = UNIT_BEFORE
1149         };
1150         int r;
1151
1152         assert(u);
1153         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1154         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1155         assert(other);
1156
1157         /* We won't allow dependencies on ourselves. We will not
1158          * consider them an error however. */
1159         if (u == other)
1160                 return 0;
1161
1162         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1163                 return r;
1164
1165         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1166                 return r;
1167
1168         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1169                 return r;
1170
1171         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1172                 set_remove(u->meta.dependencies[d], other);
1173                 return r;
1174         }
1175
1176         unit_add_to_dbus_queue(u);
1177         return 0;
1178 }
1179
1180 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
1181         Unit *other;
1182         int r;
1183
1184         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1185                 return r;
1186
1187         if ((r = unit_add_dependency(u, d, other)) < 0)
1188                 return r;
1189
1190         return 0;
1191 }
1192
1193 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1194         Unit *other;
1195         int r;
1196
1197         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1198                 return r;
1199
1200         if ((r = unit_add_dependency(other, d, u)) < 0)
1201                 return r;
1202
1203         return 0;
1204 }
1205
1206 int set_unit_path(const char *p) {
1207         char *cwd, *c;
1208         int r;
1209
1210         /* This is mostly for debug purposes */
1211
1212         if (path_is_absolute(p)) {
1213                 if (!(c = strdup(p)))
1214                         return -ENOMEM;
1215         } else {
1216                 if (!(cwd = get_current_dir_name()))
1217                         return -errno;
1218
1219                 r = asprintf(&c, "%s/%s", cwd, p);
1220                 free(cwd);
1221
1222                 if (r < 0)
1223                         return -ENOMEM;
1224         }
1225
1226         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1227                 r = -errno;
1228                 free(c);
1229                 return r;
1230         }
1231
1232         return 0;
1233 }
1234
1235 char *unit_name_escape_path(const char *path, const char *suffix) {
1236         char *r, *t;
1237         const char *f;
1238         size_t a, b;
1239
1240         assert(path);
1241
1242         /* Takes a path and a suffix and prefix and makes a nice
1243          * string suitable as unit name of it, escaping all weird
1244          * chars on the way.
1245          *
1246          * / becomes ., and all chars not alloweed in a unit name get
1247          * escaped as \xFF, including \ and ., of course. This
1248          * escaping is hence reversible.
1249          */
1250
1251         if (!suffix)
1252                 suffix = "";
1253
1254         a = strlen(path);
1255         b = strlen(suffix);
1256
1257         if (!(r = new(char, a*4+b+1)))
1258                 return NULL;
1259
1260         for (f = path, t = r; *f; f++) {
1261                 if (*f == '/')
1262                         *(t++) = '.';
1263                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1264                         *(t++) = '\\';
1265                         *(t++) = 'x';
1266                         *(t++) = hexchar(*f > 4);
1267                         *(t++) = hexchar(*f);
1268                 } else
1269                         *(t++) = *f;
1270         }
1271
1272         memcpy(t, suffix, b+1);
1273
1274         return r;
1275 }
1276
1277 char *unit_dbus_path(Unit *u) {
1278         char *p, *e;
1279
1280         assert(u);
1281
1282         if (!(e = bus_path_escape(unit_id(u))))
1283                 return NULL;
1284
1285         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1286                 free(e);
1287                 return NULL;
1288         }
1289
1290         free(e);
1291         return p;
1292 }
1293
1294 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1295         CGroupBonding *l;
1296         int r;
1297
1298         assert(u);
1299         assert(b);
1300         assert(b->path);
1301
1302         /* Ensure this hasn't been added yet */
1303         assert(!b->unit);
1304
1305         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1306         LIST_PREPEND(CGroupBonding, by_path, l, b);
1307
1308         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1309                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1310                 return r;
1311         }
1312
1313         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1314         b->unit = u;
1315
1316         return 0;
1317 }
1318
1319 static char *default_cgroup_path(Unit *u) {
1320         char *p;
1321
1322         assert(u);
1323
1324         if (asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1325                 return NULL;
1326
1327         return p;
1328 }
1329
1330 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1331         size_t n;
1332         char *controller = NULL, *path = NULL;
1333         CGroupBonding *b = NULL;
1334         int r;
1335
1336         assert(u);
1337         assert(name);
1338
1339         /* Detect controller name */
1340         n = strcspn(name, ":");
1341
1342         if (name[n] == 0 ||
1343             (name[n] == ':' && name[n+1] == 0)) {
1344
1345                 /* Only controller name, no path? */
1346
1347                 if (!(path = default_cgroup_path(u)))
1348                         return -ENOMEM;
1349
1350         } else {
1351                 const char *p;
1352
1353                 /* Controller name, and path. */
1354                 p = name+n+1;
1355
1356                 if (!path_is_absolute(p))
1357                         return -EINVAL;
1358
1359                 if (!(path = strdup(p)))
1360                         return -ENOMEM;
1361         }
1362
1363         if (n > 0)
1364                 controller = strndup(name, n);
1365         else
1366                 controller = strdup(u->meta.manager->cgroup_controller);
1367
1368         if (!controller) {
1369                 r = -ENOMEM;
1370                 goto fail;
1371         }
1372
1373         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1374                 r = -EEXIST;
1375                 goto fail;
1376         }
1377
1378         if (!(b = new0(CGroupBonding, 1))) {
1379                 r = -ENOMEM;
1380                 goto fail;
1381         }
1382
1383         b->controller = controller;
1384         b->path = path;
1385         b->only_us = false;
1386         b->clean_up = false;
1387
1388         if ((r = unit_add_cgroup(u, b)) < 0)
1389                 goto fail;
1390
1391         return 0;
1392
1393 fail:
1394         free(path);
1395         free(controller);
1396         free(b);
1397
1398         return r;
1399 }
1400
1401 int unit_add_default_cgroup(Unit *u) {
1402         CGroupBonding *b;
1403         int r = -ENOMEM;
1404
1405         assert(u);
1406
1407         /* Adds in the default cgroup data, if it wasn't specified yet */
1408
1409         if (unit_get_default_cgroup(u))
1410                 return 0;
1411
1412         if (!(b = new0(CGroupBonding, 1)))
1413                 return -ENOMEM;
1414
1415         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1416                 goto fail;
1417
1418         if (!(b->path = default_cgroup_path(u)))
1419                 goto fail;
1420
1421         b->clean_up = true;
1422         b->only_us = true;
1423
1424         if ((r = unit_add_cgroup(u, b)) < 0)
1425                 goto fail;
1426
1427         return 0;
1428
1429 fail:
1430         free(b->path);
1431         free(b->controller);
1432         free(b);
1433
1434         return r;
1435 }
1436
1437 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1438         assert(u);
1439
1440         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1441 }
1442
1443 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1444         char *t;
1445         int r;
1446
1447         assert(u);
1448         assert(type);
1449         assert(_found);
1450
1451         if (!(t = unit_name_change_suffix(unit_id(u), type)))
1452                 return -ENOMEM;
1453
1454         assert(!unit_has_name(u, t));
1455
1456         r = manager_load_unit(u->meta.manager, t, _found);
1457         free(t);
1458
1459         if (r >= 0)
1460                 assert(*_found != u);
1461
1462         return r;
1463 }
1464
1465 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1466         [UNIT_SERVICE] = "service",
1467         [UNIT_TIMER] = "timer",
1468         [UNIT_SOCKET] = "socket",
1469         [UNIT_TARGET] = "target",
1470         [UNIT_DEVICE] = "device",
1471         [UNIT_MOUNT] = "mount",
1472         [UNIT_AUTOMOUNT] = "automount",
1473         [UNIT_SNAPSHOT] = "snapshot"
1474 };
1475
1476 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1477
1478 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1479         [UNIT_STUB] = "stub",
1480         [UNIT_LOADED] = "loaded",
1481         [UNIT_FAILED] = "failed",
1482         [UNIT_MERGED] = "merged"
1483 };
1484
1485 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1486
1487 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1488         [UNIT_ACTIVE] = "active",
1489         [UNIT_INACTIVE] = "inactive",
1490         [UNIT_ACTIVATING] = "activating",
1491         [UNIT_DEACTIVATING] = "deactivating"
1492 };
1493
1494 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1495
1496 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1497         [UNIT_REQUIRES] = "Requires",
1498         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1499         [UNIT_WANTS] = "Wants",
1500         [UNIT_REQUISITE] = "Requisite",
1501         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1502         [UNIT_REQUIRED_BY] = "RequiredBy",
1503         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1504         [UNIT_WANTED_BY] = "WantedBy",
1505         [UNIT_CONFLICTS] = "Conflicts",
1506         [UNIT_BEFORE] = "Before",
1507         [UNIT_AFTER] = "After",
1508 };
1509
1510 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1511
1512 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1513         [KILL_PROCESS] = "process",
1514         [KILL_PROCESS_GROUP] = "process-group",
1515         [KILL_CONTROL_GROUP] = "control-group"
1516 };
1517
1518 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);