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 (u->meta.type != _UNIT_TYPE_INVALID &&
 159             UNIT_VTABLE(u)->no_alias &&
 160             !set_isempty(u->meta.names))
 161                 return -EEXIST;
 162
 163         if (!(s = strdup(text)))
 164                 return -ENOMEM;
 165
 166         if ((r = set_put(u->meta.names, s)) < 0) {
 167                 free(s);
 168
 169                 if (r == -EEXIST)
 170                         return 0;
 171
 172                 return r;
 173         }
 174
 175         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 176                 set_remove(u->meta.names, s);
 177                 free(s);
 178                 return r;
 179         }
 180
 181         if (u->meta.type == _UNIT_TYPE_INVALID) {
 182                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 183
 184                 u->meta.type = t;
 185
 186                 if (UNIT_VTABLE(u)->init)
 187                         UNIT_VTABLE(u)->init(u);
 188         }
 189
 190         if (!u->meta.id)
 191                 u->meta.id = s;
 192
 193         unit_add_to_dbus_queue(u);
 194         return 0;
 195 }
 196
 197 int unit_choose_id(Unit *u, const char *name) {
 198         char *s;
 199
 200         assert(u);
 201         assert(name);
 202
 203         /* Selects one of the names of this unit as the id */
 204
 205         if (!(s = set_get(u->meta.names, (char*) name)))
 206                 return -ENOENT;
 207
 208         u->meta.id = s;
 209
 210         unit_add_to_dbus_queue(u);
 211         return 0;
 212 }
 213
 214 int unit_set_description(Unit *u, const char *description) {
 215         char *s;
 216
 217         assert(u);
 218
 219         if (!(s = strdup(description)))
 220                 return -ENOMEM;
 221
 222         free(u->meta.description);
 223         u->meta.description = s;
 224
 225         unit_add_to_dbus_queue(u);
 226         return 0;
 227 }
 228
 229 void unit_add_to_load_queue(Unit *u) {
 230         assert(u);
 231         assert(u->meta.type != _UNIT_TYPE_INVALID);
 232
 233         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 234                 return;
 235
 236         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 237         u->meta.in_load_queue = true;
 238 }
 239
 240 void unit_add_to_cleanup_queue(Unit *u) {
 241         assert(u);
 242
 243         if (u->meta.in_cleanup_queue)
 244                 return;
 245
 246         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 247         u->meta.in_cleanup_queue = true;
 248 }
 249
 250 void unit_add_to_dbus_queue(Unit *u) {
 251         assert(u);
 252         assert(u->meta.type != _UNIT_TYPE_INVALID);
 253
 254         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
 255                 return;
 256
 257         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 258         u->meta.in_dbus_queue = true;
 259 }
 260
 261 static void bidi_set_free(Unit *u, Set *s) {
 262         Iterator i;
 263         Unit *other;
 264
 265         assert(u);
 266
 267         /* Frees the set and makes sure we are dropped from the
 268          * inverse pointers */
 269
 270         SET_FOREACH(other, s, i) {
 271                 UnitDependency d;
 272
 273                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 274                         set_remove(other->meta.dependencies[d], u);
 275         }
 276
 277         set_free(s);
 278 }
 279
 280 void unit_free(Unit *u) {
 281         UnitDependency d;
 282         Iterator i;
 283         char *t;
 284
 285         assert(u);
 286
 287         bus_unit_send_removed_signal(u);
 288
 289         /* Detach from next 'bigger' objects */
 290         SET_FOREACH(t, u->meta.names, i)
 291                 hashmap_remove_value(u->meta.manager->units, t, u);
 292
 293         if (u->meta.type != _UNIT_TYPE_INVALID)
 294                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 295
 296         if (u->meta.in_load_queue)
 297                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 298
 299         if (u->meta.in_dbus_queue)
 300                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 301
 302         if (u->meta.in_cleanup_queue)
 303                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 304
 305         /* Free data and next 'smaller' objects */
 306         if (u->meta.job)
 307                 job_free(u->meta.job);
 308
 309         if (u->meta.load_state != UNIT_STUB)
 310                 if (UNIT_VTABLE(u)->done)
 311                         UNIT_VTABLE(u)->done(u);
 312
 313         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 314
 315         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 316                 bidi_set_free(u, u->meta.dependencies[d]);
 317
 318         free(u->meta.description);
 319         free(u->meta.fragment_path);
 320
 321         while ((t = set_steal_first(u->meta.names)))
 322                 free(t);
 323         set_free(u->meta.names);
 324
 325         free(u);
 326 }
 327
 328 UnitActiveState unit_active_state(Unit *u) {
 329         assert(u);
 330
 331         if (u->meta.load_state != UNIT_LOADED)
 332                 return UNIT_INACTIVE;
 333
 334         return UNIT_VTABLE(u)->active_state(u);
 335 }
 336
 337 static void complete_move(Set **s, Set **other) {
 338         assert(s);
 339         assert(other);
 340
 341         if (!*other)
 342                 return;
 343
 344         if (*s)
 345                 set_move(*s, *other);
 346         else {
 347                 *s = *other;
 348                 *other = NULL;
 349         }
 350 }
 351
 352 static void merge_names(Unit *u, Unit *other) {
 353         char *t;
 354         Iterator i;
 355
 356         assert(u);
 357         assert(other);
 358
 359         complete_move(&u->meta.names, &other->meta.names);
 360
 361         while ((t = set_steal_first(other->meta.names)))
 362                 free(t);
 363
 364         set_free(other->meta.names);
 365         other->meta.names = NULL;
 366         other->meta.id = NULL;
 367
 368         SET_FOREACH(t, u->meta.names, i)
 369                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 370 }
 371
 372 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 373         Iterator i;
 374         Unit *back;
 375         int r;
 376
 377         assert(u);
 378         assert(other);
 379         assert(d < _UNIT_DEPENDENCY_MAX);
 380
 381         SET_FOREACH(back, other->meta.dependencies[d], i) {
 382                 UnitDependency k;
 383
 384                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 385                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 386
 387                                 if (r == -EEXIST)
 388                                         set_remove(back->meta.dependencies[k], other);
 389                                 else
 390                                         assert(r == -ENOENT);
 391                         }
 392         }
 393
 394         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 395
 396         set_free(other->meta.dependencies[d]);
 397         other->meta.dependencies[d] = NULL;
 398 }
 399
 400 int unit_merge(Unit *u, Unit *other) {
 401         UnitDependency d;
 402
 403         assert(u);
 404         assert(other);
 405         assert(u->meta.manager == other->meta.manager);
 406
 407         other = unit_follow_merge(other);
 408
 409         if (other == u)
 410                 return 0;
 411
 412         if (u->meta.type != u->meta.type)
 413                 return -EINVAL;
 414
 415         if (other->meta.load_state != UNIT_STUB &&
 416             other->meta.load_state != UNIT_FAILED)
 417                 return -EEXIST;
 418
 419         if (other->meta.job)
 420                 return -EEXIST;
 421
 422         if (unit_active_state(other) != UNIT_INACTIVE)
 423                 return -EEXIST;
 424
 425         /* Merge names */
 426         merge_names(u, other);
 427
 428         /* Merge dependencies */
 429         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 430                 merge_dependencies(u, other, d);
 431
 432         other->meta.load_state = UNIT_MERGED;
 433         other->meta.merged_into = u;
 434
 435         /* If there is still some data attached to the other node, we
 436          * don't need it anymore, and can free it. */
 437         if (other->meta.load_state != UNIT_STUB)
 438                 if (UNIT_VTABLE(other)->done)
 439                         UNIT_VTABLE(other)->done(other);
 440
 441         unit_add_to_dbus_queue(u);
 442         unit_add_to_cleanup_queue(other);
 443
 444         return 0;
 445 }
 446
 447 int unit_merge_by_name(Unit *u, const char *name) {
 448         Unit *other;
 449
 450         assert(u);
 451         assert(name);
 452
 453         if (!(other = manager_get_unit(u->meta.manager, name)))
 454                 return unit_add_name(u, name);
 455
 456         return unit_merge(u, other);
 457 }
 458
 459 Unit* unit_follow_merge(Unit *u) {
 460         assert(u);
 461
 462         while (u->meta.load_state == UNIT_MERGED)
 463                 assert_se(u = u->meta.merged_into);
 464
 465         return u;
 466 }
 467
 468 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 469         int r;
 470
 471         assert(u);
 472         assert(c);
 473
 474         if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
 475                 return 0;
 476
 477         /* If syslog or kernel logging is requested, make sure our own
 478          * logging daemon is run first. */
 479
 480         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
 481                 return r;
 482
 483         if (u->meta.manager->running_as != MANAGER_SESSION)
 484                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
 485                         return r;
 486
 487         return 0;
 488 }
 489
 490 const char* unit_id(Unit *u) {
 491         assert(u);
 492
 493         if (u->meta.id)
 494                 return u->meta.id;
 495
 496         return set_first(u->meta.names);
 497 }
 498
 499 const char *unit_description(Unit *u) {
 500         assert(u);
 501
 502         if (u->meta.description)
 503                 return u->meta.description;
 504
 505         return unit_id(u);
 506 }
 507
 508 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 509         char *t;
 510         UnitDependency d;
 511         Iterator i;
 512         char *p2;
 513         const char *prefix2;
 514         CGroupBonding *b;
 515         char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
 516
 517         assert(u);
 518
 519         if (!prefix)
 520                 prefix = "";
 521         p2 = strappend(prefix, "\t");
 522         prefix2 = p2 ? p2 : prefix;
 523
 524         fprintf(f,
 525                 "%s→ Unit %s:\n"
 526                 "%s\tDescription: %s\n"
 527                 "%s\tUnit Load State: %s\n"
 528                 "%s\tUnit Active State: %s\n"
 529                 "%s\tActive Enter Timestamp: %s\n"
 530                 "%s\tActive Exit Timestamp: %s\n",
 531                 prefix, unit_id(u),
 532                 prefix, unit_description(u),
 533                 prefix, unit_load_state_to_string(u->meta.load_state),
 534                 prefix, unit_active_state_to_string(unit_active_state(u)),
 535                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
 536                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)));
 537
 538         SET_FOREACH(t, u->meta.names, i)
 539                 fprintf(f, "%s\tName: %s\n", prefix, t);
 540
 541         if (u->meta.fragment_path)
 542                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 543
 544         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 545                 Unit *other;
 546
 547                 SET_FOREACH(other, u->meta.dependencies[d], i)
 548                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 549         }
 550
 551         if (u->meta.load_state == UNIT_LOADED) {
 552                 fprintf(f,
 553                         "%s\tRecursive Stop: %s\n"
 554                         "%s\tStop When Unneeded: %s\n",
 555                         prefix, yes_no(u->meta.recursive_stop),
 556                         prefix, yes_no(u->meta.stop_when_unneeded));
 557
 558                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 559                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 560                                 prefix, b->controller, b->path);
 561
 562                 if (UNIT_VTABLE(u)->dump)
 563                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 564
 565         } else if (u->meta.load_state == UNIT_MERGED)
 566                 fprintf(f,
 567                         "%s\tMerged into: %s\n",
 568                         prefix, unit_id(u->meta.merged_into));
 569
 570         if (u->meta.job)
 571                 job_dump(u->meta.job, f, prefix2);
 572
 573         free(p2);
 574 }
 575
 576 /* Common implementation for multiple backends */
 577 int unit_load_fragment_and_dropin(Unit *u) {
 578         int r;
 579
 580         assert(u);
 581
 582         /* Load a .service file */
 583         if ((r = unit_load_fragment(u)) < 0)
 584                 return r;
 585
 586         if (u->meta.load_state == UNIT_STUB)
 587                 return -ENOENT;
 588
 589         /* Load drop-in directory data */
 590         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 591                 return r;
 592
 593         return 0;
 594 }
 595
 596 /* Common implementation for multiple backends */
 597 int unit_load_fragment_and_dropin_optional(Unit *u) {
 598         int r;
 599
 600         assert(u);
 601
 602         /* Same as unit_load_fragment_and_dropin(), but whether
 603          * something can be loaded or not doesn't matter. */
 604
 605         /* Load a .service file */
 606         if ((r = unit_load_fragment(u)) < 0)
 607                 return r;
 608
 609         if (u->meta.load_state == UNIT_STUB)
 610                 u->meta.load_state = UNIT_LOADED;
 611
 612         /* Load drop-in directory data */
 613         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 614                 return r;
 615
 616         return 0;
 617 }
 618
 619 int unit_load(Unit *u) {
 620         int r;
 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.type == _UNIT_TYPE_INVALID)
 630                 return -EINVAL;
 631
 632         if (u->meta.load_state != UNIT_STUB)
 633                 return 0;
 634
 635         if (UNIT_VTABLE(u)->load)
 636                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 637                         goto fail;
 638
 639         if (u->meta.load_state == UNIT_STUB) {
 640                 r = -ENOENT;
 641                 goto fail;
 642         }
 643
 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         unit_add_to_dbus_queue(u);
 715         return UNIT_VTABLE(u)->stop(u);
 716 }
 717
 718 /* Errors:
 719  *         -EBADR:    This unit type does not support reloading.
 720  *         -ENOEXEC:  Unit is not started.
 721  *         -EAGAIN:   An operation is already in progress. Retry later.
 722  */
 723 int unit_reload(Unit *u) {
 724         UnitActiveState state;
 725
 726         assert(u);
 727
 728         if (!unit_can_reload(u))
 729                 return -EBADR;
 730
 731         state = unit_active_state(u);
 732         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 733                 return -EALREADY;
 734
 735         if (unit_active_state(u) != UNIT_ACTIVE)
 736                 return -ENOEXEC;
 737
 738         unit_add_to_dbus_queue(u);
 739         return UNIT_VTABLE(u)->reload(u);
 740 }
 741
 742 bool unit_can_reload(Unit *u) {
 743         assert(u);
 744
 745         if (!UNIT_VTABLE(u)->reload)
 746                 return false;
 747
 748         if (!UNIT_VTABLE(u)->can_reload)
 749                 return true;
 750
 751         return UNIT_VTABLE(u)->can_reload(u);
 752 }
 753
 754 static void unit_check_uneeded(Unit *u) {
 755         Iterator i;
 756         Unit *other;
 757
 758         assert(u);
 759
 760         /* If this service shall be shut down when unneeded then do
 761          * so. */
 762
 763         if (!u->meta.stop_when_unneeded)
 764                 return;
 765
 766         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 767                 return;
 768
 769         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 770                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 771                         return;
 772
 773         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 774                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 775                         return;
 776
 777         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 778                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 779                         return;
 780
 781         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 782
 783         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 784         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 785 }
 786
 787 static void retroactively_start_dependencies(Unit *u) {
 788         Iterator i;
 789         Unit *other;
 790
 791         assert(u);
 792         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 793
 794         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 795                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 796                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 797
 798         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 799                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 800                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 801
 802         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 803                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 804                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 805
 806         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 807                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 808                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 809
 810         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 811                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 812                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 813 }
 814
 815 static void retroactively_stop_dependencies(Unit *u) {
 816         Iterator i;
 817         Unit *other;
 818
 819         assert(u);
 820         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 821
 822         if (u->meta.recursive_stop) {
 823                 /* Pull down units need us recursively if enabled */
 824                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 825                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 826                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 827         }
 828
 829         /* Garbage collect services that might not be needed anymore, if enabled */
 830         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 831                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 832                         unit_check_uneeded(other);
 833         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_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_WANTS], 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_REQUISITE], 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_SOFT_REQUISITE], i)
 843                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 844                         unit_check_uneeded(other);
 845 }
 846
 847 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 848         bool unexpected = false;
 849
 850         assert(u);
 851         assert(os < _UNIT_ACTIVE_STATE_MAX);
 852         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 853         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 854         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 855
 856         /* Note that this is called for all low-level state changes,
 857          * even if they might map to the same high-level
 858          * UnitActiveState! That means that ns == os is OK an expected
 859          * behaviour here. For example: if a mount point is remounted
 860          * this function will be called too and the utmp code below
 861          * relies on that! */
 862
 863         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 864                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 865         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 866                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 867
 868         if (u->meta.job) {
 869
 870                 if (u->meta.job->state == JOB_WAITING)
 871
 872                         /* So we reached a different state for this
 873                          * job. Let's see if we can run it now if it
 874                          * failed previously due to EAGAIN. */
 875                         job_add_to_run_queue(u->meta.job);
 876
 877                 else {
 878                         assert(u->meta.job->state == JOB_RUNNING);
 879
 880                         /* Let's check whether this state change
 881                          * constitutes a finished job, or maybe
 882                          * cotradicts a running job and hence needs to
 883                          * invalidate jobs. */
 884
 885                         switch (u->meta.job->type) {
 886
 887                         case JOB_START:
 888                         case JOB_VERIFY_ACTIVE:
 889
 890                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
 891                                         job_finish_and_invalidate(u->meta.job, true);
 892                                 else if (ns != UNIT_ACTIVATING) {
 893                                         unexpected = true;
 894                                         job_finish_and_invalidate(u->meta.job, false);
 895                                 }
 896
 897                                 break;
 898
 899                         case JOB_RELOAD:
 900                         case JOB_RELOAD_OR_START:
 901
 902                                 if (ns == UNIT_ACTIVE)
 903                                         job_finish_and_invalidate(u->meta.job, true);
 904                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
 905                                         unexpected = true;
 906                                         job_finish_and_invalidate(u->meta.job, false);
 907                                 }
 908
 909                                 break;
 910
 911                         case JOB_STOP:
 912                         case JOB_RESTART:
 913                         case JOB_TRY_RESTART:
 914
 915                                 if (ns == UNIT_INACTIVE)
 916                                         job_finish_and_invalidate(u->meta.job, true);
 917                                 else if (ns != UNIT_DEACTIVATING) {
 918                                         unexpected = true;
 919                                         job_finish_and_invalidate(u->meta.job, false);
 920                                 }
 921
 922                                 break;
 923
 924                         default:
 925                                 assert_not_reached("Job type unknown");
 926                         }
 927                 }
 928         }
 929
 930         /* If this state change happened without being requested by a
 931          * job, then let's retroactively start or stop dependencies */
 932
 933         if (unexpected) {
 934                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 935                         retroactively_start_dependencies(u);
 936                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 937                         retroactively_stop_dependencies(u);
 938         }
 939
 940         /* Some names are special */
 941         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 942                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
 943                         /* The bus just might have become available,
 944                          * hence try to connect to it, if we aren't
 945                          * yet connected. */
 946                         bus_init_system(u->meta.manager);
 947                         bus_init_api(u->meta.manager);
 948                 }
 949
 950                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 951                         /* The syslog daemon just might have become
 952                          * available, hence try to connect to it, if
 953                          * we aren't yet connected. */
 954                         log_open_syslog();
 955
 956                 if (u->meta.type == UNIT_MOUNT)
 957                         /* Another directory became available, let's
 958                          * check if that is enough to write our utmp
 959                          * entry. */
 960                         manager_write_utmp_reboot(u->meta.manager);
 961
 962                 if (u->meta.type == UNIT_TARGET)
 963                         /* A target got activated, maybe this is a runlevel? */
 964                         manager_write_utmp_runlevel(u->meta.manager, u);
 965
 966         } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 967
 968                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
 969                         /* The syslog daemon might just have
 970                          * terminated, hence try to disconnect from
 971                          * it. */
 972                         log_close_syslog();
 973
 974                 /* We don't care about D-Bus here, since we'll get an
 975                  * asynchronous notification for it anyway. */
 976         }
 977
 978         /* Maybe we finished startup and are now ready for being
 979          * stopped because unneeded? */
 980         unit_check_uneeded(u);
 981
 982         unit_add_to_dbus_queue(u);
 983 }
 984
 985 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 986         struct epoll_event ev;
 987
 988         assert(u);
 989         assert(fd >= 0);
 990         assert(w);
 991         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 992
 993         zero(ev);
 994         ev.data.ptr = w;
 995         ev.events = events;
 996
 997         if (epoll_ctl(u->meta.manager->epoll_fd,
 998                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 999                       fd,
1000                       &ev) < 0)
1001                 return -errno;
1002
1003         w->fd = fd;
1004         w->type = WATCH_FD;
1005         w->data.unit = u;
1006
1007         return 0;
1008 }
1009
1010 void unit_unwatch_fd(Unit *u, Watch *w) {
1011         assert(u);
1012         assert(w);
1013
1014         if (w->type == WATCH_INVALID)
1015                 return;
1016
1017         assert(w->type == WATCH_FD);
1018         assert(w->data.unit == u);
1019         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1020
1021         w->fd = -1;
1022         w->type = WATCH_INVALID;
1023         w->data.unit = NULL;
1024 }
1025
1026 int unit_watch_pid(Unit *u, pid_t pid) {
1027         assert(u);
1028         assert(pid >= 1);
1029
1030         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1031 }
1032
1033 void unit_unwatch_pid(Unit *u, pid_t pid) {
1034         assert(u);
1035         assert(pid >= 1);
1036
1037         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
1038 }
1039
1040 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1041         struct itimerspec its;
1042         int flags, fd;
1043         bool ours;
1044
1045         assert(u);
1046         assert(w);
1047         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1048
1049         /* This will try to reuse the old timer if there is one */
1050
1051         if (w->type == WATCH_TIMER) {
1052                 ours = false;
1053                 fd = w->fd;
1054         } else {
1055                 ours = true;
1056                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1057                         return -errno;
1058         }
1059
1060         zero(its);
1061
1062         if (delay <= 0) {
1063                 /* Set absolute time in the past, but not 0, since we
1064                  * don't want to disarm the timer */
1065                 its.it_value.tv_sec = 0;
1066                 its.it_value.tv_nsec = 1;
1067
1068                 flags = TFD_TIMER_ABSTIME;
1069         } else {
1070                 timespec_store(&its.it_value, delay);
1071                 flags = 0;
1072         }
1073
1074         /* This will also flush the elapse counter */
1075         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1076                 goto fail;
1077
1078         if (w->type == WATCH_INVALID) {
1079                 struct epoll_event ev;
1080
1081                 zero(ev);
1082                 ev.data.ptr = w;
1083                 ev.events = EPOLLIN;
1084
1085                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1086                         goto fail;
1087         }
1088
1089         w->fd = fd;
1090         w->type = WATCH_TIMER;
1091         w->data.unit = u;
1092
1093         return 0;
1094
1095 fail:
1096         if (ours)
1097                 close_nointr_nofail(fd);
1098
1099         return -errno;
1100 }
1101
1102 void unit_unwatch_timer(Unit *u, Watch *w) {
1103         assert(u);
1104         assert(w);
1105
1106         if (w->type == WATCH_INVALID)
1107                 return;
1108
1109         assert(w->type == WATCH_TIMER && w->data.unit == u);
1110
1111         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1112         assert_se(close_nointr(w->fd) == 0);
1113
1114         w->fd = -1;
1115         w->type = WATCH_INVALID;
1116         w->data.unit = NULL;
1117 }
1118
1119 bool unit_job_is_applicable(Unit *u, JobType j) {
1120         assert(u);
1121         assert(j >= 0 && j < _JOB_TYPE_MAX);
1122
1123         switch (j) {
1124
1125         case JOB_VERIFY_ACTIVE:
1126         case JOB_START:
1127                 return true;
1128
1129         case JOB_STOP:
1130         case JOB_RESTART:
1131         case JOB_TRY_RESTART:
1132                 return unit_can_start(u);
1133
1134         case JOB_RELOAD:
1135                 return unit_can_reload(u);
1136
1137         case JOB_RELOAD_OR_START:
1138                 return unit_can_reload(u) && unit_can_start(u);
1139
1140         default:
1141                 assert_not_reached("Invalid job type");
1142         }
1143 }
1144
1145 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1146
1147         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1148                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1149                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1150                 [UNIT_WANTS] = UNIT_WANTED_BY,
1151                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1152                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1153                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1154                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1155                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1156                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1157                 [UNIT_BEFORE] = UNIT_AFTER,
1158                 [UNIT_AFTER] = UNIT_BEFORE
1159         };
1160         int r;
1161
1162         assert(u);
1163         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1164         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1165         assert(other);
1166
1167         /* We won't allow dependencies on ourselves. We will not
1168          * consider them an error however. */
1169         if (u == other)
1170                 return 0;
1171
1172         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1173                 return r;
1174
1175         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1176                 return r;
1177
1178         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1179                 return r;
1180
1181         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1182                 set_remove(u->meta.dependencies[d], other);
1183                 return r;
1184         }
1185
1186         unit_add_to_dbus_queue(u);
1187         return 0;
1188 }
1189
1190 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
1191         Unit *other;
1192         int r;
1193
1194         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1195                 return r;
1196
1197         if ((r = unit_add_dependency(u, d, other)) < 0)
1198                 return r;
1199
1200         return 0;
1201 }
1202
1203 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1204         Unit *other;
1205         int r;
1206
1207         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1208                 return r;
1209
1210         if ((r = unit_add_dependency(other, d, u)) < 0)
1211                 return r;
1212
1213         return 0;
1214 }
1215
1216 int set_unit_path(const char *p) {
1217         char *cwd, *c;
1218         int r;
1219
1220         /* This is mostly for debug purposes */
1221
1222         if (path_is_absolute(p)) {
1223                 if (!(c = strdup(p)))
1224                         return -ENOMEM;
1225         } else {
1226                 if (!(cwd = get_current_dir_name()))
1227                         return -errno;
1228
1229                 r = asprintf(&c, "%s/%s", cwd, p);
1230                 free(cwd);
1231
1232                 if (r < 0)
1233                         return -ENOMEM;
1234         }
1235
1236         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1237                 r = -errno;
1238                 free(c);
1239                 return r;
1240         }
1241
1242         return 0;
1243 }
1244
1245 char *unit_name_escape_path(const char *path, const char *suffix) {
1246         char *r, *t;
1247         const char *f;
1248         size_t a, b;
1249
1250         assert(path);
1251
1252         /* Takes a path and a suffix and prefix and makes a nice
1253          * string suitable as unit name of it, escaping all weird
1254          * chars on the way.
1255          *
1256          * / becomes ., and all chars not alloweed in a unit name get
1257          * escaped as \xFF, including \ and ., of course. This
1258          * escaping is hence reversible.
1259          */
1260
1261         if (!suffix)
1262                 suffix = "";
1263
1264         a = strlen(path);
1265         b = strlen(suffix);
1266
1267         if (!(r = new(char, a*4+b+1)))
1268                 return NULL;
1269
1270         for (f = path, t = r; *f; f++) {
1271                 if (*f == '/')
1272                         *(t++) = '.';
1273                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1274                         *(t++) = '\\';
1275                         *(t++) = 'x';
1276                         *(t++) = hexchar(*f > 4);
1277                         *(t++) = hexchar(*f);
1278                 } else
1279                         *(t++) = *f;
1280         }
1281
1282         memcpy(t, suffix, b+1);
1283
1284         return r;
1285 }
1286
1287 char *unit_dbus_path(Unit *u) {
1288         char *p, *e;
1289
1290         assert(u);
1291
1292         if (!(e = bus_path_escape(unit_id(u))))
1293                 return NULL;
1294
1295         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1296                 free(e);
1297                 return NULL;
1298         }
1299
1300         free(e);
1301         return p;
1302 }
1303
1304 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1305         CGroupBonding *l;
1306         int r;
1307
1308         assert(u);
1309         assert(b);
1310         assert(b->path);
1311
1312         /* Ensure this hasn't been added yet */
1313         assert(!b->unit);
1314
1315         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1316         LIST_PREPEND(CGroupBonding, by_path, l, b);
1317
1318         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1319                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1320                 return r;
1321         }
1322
1323         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1324         b->unit = u;
1325
1326         return 0;
1327 }
1328
1329 static char *default_cgroup_path(Unit *u) {
1330         char *p;
1331
1332         assert(u);
1333
1334         if (asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1335                 return NULL;
1336
1337         return p;
1338 }
1339
1340 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1341         size_t n;
1342         char *controller = NULL, *path = NULL;
1343         CGroupBonding *b = NULL;
1344         int r;
1345
1346         assert(u);
1347         assert(name);
1348
1349         /* Detect controller name */
1350         n = strcspn(name, ":");
1351
1352         if (name[n] == 0 ||
1353             (name[n] == ':' && name[n+1] == 0)) {
1354
1355                 /* Only controller name, no path? */
1356
1357                 if (!(path = default_cgroup_path(u)))
1358                         return -ENOMEM;
1359
1360         } else {
1361                 const char *p;
1362
1363                 /* Controller name, and path. */
1364                 p = name+n+1;
1365
1366                 if (!path_is_absolute(p))
1367                         return -EINVAL;
1368
1369                 if (!(path = strdup(p)))
1370                         return -ENOMEM;
1371         }
1372
1373         if (n > 0)
1374                 controller = strndup(name, n);
1375         else
1376                 controller = strdup(u->meta.manager->cgroup_controller);
1377
1378         if (!controller) {
1379                 r = -ENOMEM;
1380                 goto fail;
1381         }
1382
1383         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1384                 r = -EEXIST;
1385                 goto fail;
1386         }
1387
1388         if (!(b = new0(CGroupBonding, 1))) {
1389                 r = -ENOMEM;
1390                 goto fail;
1391         }
1392
1393         b->controller = controller;
1394         b->path = path;
1395         b->only_us = false;
1396         b->clean_up = false;
1397
1398         if ((r = unit_add_cgroup(u, b)) < 0)
1399                 goto fail;
1400
1401         return 0;
1402
1403 fail:
1404         free(path);
1405         free(controller);
1406         free(b);
1407
1408         return r;
1409 }
1410
1411 int unit_add_default_cgroup(Unit *u) {
1412         CGroupBonding *b;
1413         int r = -ENOMEM;
1414
1415         assert(u);
1416
1417         /* Adds in the default cgroup data, if it wasn't specified yet */
1418
1419         if (unit_get_default_cgroup(u))
1420                 return 0;
1421
1422         if (!(b = new0(CGroupBonding, 1)))
1423                 return -ENOMEM;
1424
1425         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1426                 goto fail;
1427
1428         if (!(b->path = default_cgroup_path(u)))
1429                 goto fail;
1430
1431         b->clean_up = true;
1432         b->only_us = true;
1433
1434         if ((r = unit_add_cgroup(u, b)) < 0)
1435                 goto fail;
1436
1437         return 0;
1438
1439 fail:
1440         free(b->path);
1441         free(b->controller);
1442         free(b);
1443
1444         return r;
1445 }
1446
1447 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1448         assert(u);
1449
1450         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1451 }
1452
1453 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1454         char *t;
1455         int r;
1456
1457         assert(u);
1458         assert(type);
1459         assert(_found);
1460
1461         if (!(t = unit_name_change_suffix(unit_id(u), type)))
1462                 return -ENOMEM;
1463
1464         assert(!unit_has_name(u, t));
1465
1466         r = manager_load_unit(u->meta.manager, t, _found);
1467         free(t);
1468
1469         if (r >= 0)
1470                 assert(*_found != u);
1471
1472         return r;
1473 }
1474
1475 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1476         [UNIT_SERVICE] = "service",
1477         [UNIT_TIMER] = "timer",
1478         [UNIT_SOCKET] = "socket",
1479         [UNIT_TARGET] = "target",
1480         [UNIT_DEVICE] = "device",
1481         [UNIT_MOUNT] = "mount",
1482         [UNIT_AUTOMOUNT] = "automount",
1483         [UNIT_SNAPSHOT] = "snapshot"
1484 };
1485
1486 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1487
1488 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1489         [UNIT_STUB] = "stub",
1490         [UNIT_LOADED] = "loaded",
1491         [UNIT_FAILED] = "failed",
1492         [UNIT_MERGED] = "merged"
1493 };
1494
1495 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1496
1497 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1498         [UNIT_ACTIVE] = "active",
1499         [UNIT_INACTIVE] = "inactive",
1500         [UNIT_ACTIVATING] = "activating",
1501         [UNIT_DEACTIVATING] = "deactivating"
1502 };
1503
1504 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1505
1506 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1507         [UNIT_REQUIRES] = "Requires",
1508         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1509         [UNIT_WANTS] = "Wants",
1510         [UNIT_REQUISITE] = "Requisite",
1511         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1512         [UNIT_REQUIRED_BY] = "RequiredBy",
1513         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1514         [UNIT_WANTED_BY] = "WantedBy",
1515         [UNIT_CONFLICTS] = "Conflicts",
1516         [UNIT_BEFORE] = "Before",
1517         [UNIT_AFTER] = "After",
1518 };
1519
1520 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1521
1522 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1523         [KILL_CONTROL_GROUP] = "control-group",
1524         [KILL_PROCESS_GROUP] = "process-group",
1525         [KILL_PROCESS] = "process",
1526         [KILL_NONE] = "none"
1527 };
1528
1529 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);