src/unit.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44
  45 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  46         [UNIT_SERVICE] = &service_vtable,
  47         [UNIT_TIMER] = &timer_vtable,
  48         [UNIT_SOCKET] = &socket_vtable,
  49         [UNIT_TARGET] = &target_vtable,
  50         [UNIT_DEVICE] = &device_vtable,
  51         [UNIT_MOUNT] = &mount_vtable,
  52         [UNIT_AUTOMOUNT] = &automount_vtable,
  53         [UNIT_SNAPSHOT] = &snapshot_vtable,
  54         [UNIT_SWAP] = &swap_vtable,
  55         [UNIT_PATH] = &path_vtable
  56 };
  57
  58 Unit *unit_new(Manager *m) {
  59         Unit *u;
  60
  61         assert(m);
  62
  63         if (!(u = new0(Unit, 1)))
  64                 return NULL;
  65
  66         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  67                 free(u);
  68                 return NULL;
  69         }
  70
  71         u->meta.manager = m;
  72         u->meta.type = _UNIT_TYPE_INVALID;
  73         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  74         u->meta.default_dependencies = true;
  75
  76         return u;
  77 }
  78
  79 bool unit_has_name(Unit *u, const char *name) {
  80         assert(u);
  81         assert(name);
  82
  83         return !!set_get(u->meta.names, (char*) name);
  84 }
  85
  86 int unit_add_name(Unit *u, const char *text) {
  87         UnitType t;
  88         char *s, *i = NULL;
  89         int r;
  90
  91         assert(u);
  92         assert(text);
  93
  94         if (unit_name_is_template(text)) {
  95                 if (!u->meta.instance)
  96                         return -EINVAL;
  97
  98                 s = unit_name_replace_instance(text, u->meta.instance);
  99         } else
 100                 s = strdup(text);
 101
 102         if (!s)
 103                 return -ENOMEM;
 104
 105         if (!unit_name_is_valid(s)) {
 106                 r = -EINVAL;
 107                 goto fail;
 108         }
 109
 110         assert_se((t = unit_name_to_type(s)) >= 0);
 111
 112         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 113                 r = -EINVAL;
 114                 goto fail;
 115         }
 116
 117         if ((r = unit_name_to_instance(s, &i)) < 0)
 118                 goto fail;
 119
 120         if (i && unit_vtable[t]->no_instances)
 121                 goto fail;
 122
 123         /* Ensure that this unit is either instanced or not instanced,
 124          * but not both. */
 125         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 126                 r = -EINVAL;
 127                 goto fail;
 128         }
 129
 130         if (unit_vtable[t]->no_alias &&
 131             !set_isempty(u->meta.names) &&
 132             !set_get(u->meta.names, s)) {
 133                 r = -EEXIST;
 134                 goto fail;
 135         }
 136
 137         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 138                 r = -E2BIG;
 139                 goto fail;
 140         }
 141
 142         if ((r = set_put(u->meta.names, s)) < 0) {
 143                 if (r == -EEXIST)
 144                         r = 0;
 145                 goto fail;
 146         }
 147
 148         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 149                 set_remove(u->meta.names, s);
 150                 goto fail;
 151         }
 152
 153         if (u->meta.type == _UNIT_TYPE_INVALID) {
 154
 155                 u->meta.type = t;
 156                 u->meta.id = s;
 157                 u->meta.instance = i;
 158
 159                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 160
 161                 if (UNIT_VTABLE(u)->init)
 162                         UNIT_VTABLE(u)->init(u);
 163         } else
 164                 free(i);
 165
 166         unit_add_to_dbus_queue(u);
 167         return 0;
 168
 169 fail:
 170         free(s);
 171         free(i);
 172
 173         return r;
 174 }
 175
 176 int unit_choose_id(Unit *u, const char *name) {
 177         char *s, *t = NULL, *i;
 178         int r;
 179
 180         assert(u);
 181         assert(name);
 182
 183         if (unit_name_is_template(name)) {
 184
 185                 if (!u->meta.instance)
 186                         return -EINVAL;
 187
 188                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 189                         return -ENOMEM;
 190
 191                 name = t;
 192         }
 193
 194         /* Selects one of the names of this unit as the id */
 195         s = set_get(u->meta.names, (char*) name);
 196         free(t);
 197
 198         if (!s)
 199                 return -ENOENT;
 200
 201         if ((r = unit_name_to_instance(s, &i)) < 0)
 202                 return r;
 203
 204         u->meta.id = s;
 205
 206         free(u->meta.instance);
 207         u->meta.instance = i;
 208
 209         unit_add_to_dbus_queue(u);
 210
 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 bool unit_check_gc(Unit *u) {
 230         assert(u);
 231
 232         if (u->meta.load_state == UNIT_STUB)
 233                 return true;
 234
 235         if (UNIT_VTABLE(u)->no_gc)
 236                 return true;
 237
 238         if (u->meta.job)
 239                 return true;
 240
 241         if (unit_active_state(u) != UNIT_INACTIVE)
 242                 return true;
 243
 244         if (UNIT_VTABLE(u)->check_gc)
 245                 if (UNIT_VTABLE(u)->check_gc(u))
 246                         return true;
 247
 248         return false;
 249 }
 250
 251 void unit_add_to_load_queue(Unit *u) {
 252         assert(u);
 253         assert(u->meta.type != _UNIT_TYPE_INVALID);
 254
 255         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 256                 return;
 257
 258         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 259         u->meta.in_load_queue = true;
 260 }
 261
 262 void unit_add_to_cleanup_queue(Unit *u) {
 263         assert(u);
 264
 265         if (u->meta.in_cleanup_queue)
 266                 return;
 267
 268         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 269         u->meta.in_cleanup_queue = true;
 270 }
 271
 272 void unit_add_to_gc_queue(Unit *u) {
 273         assert(u);
 274
 275         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 276                 return;
 277
 278         if (unit_check_gc(u))
 279                 return;
 280
 281         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 282         u->meta.in_gc_queue = true;
 283
 284         u->meta.manager->n_in_gc_queue ++;
 285
 286         if (u->meta.manager->gc_queue_timestamp <= 0)
 287                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 288 }
 289
 290 void unit_add_to_dbus_queue(Unit *u) {
 291         assert(u);
 292         assert(u->meta.type != _UNIT_TYPE_INVALID);
 293
 294         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 295                 return;
 296
 297         /* Shortcut things if nobody cares */
 298         if (!bus_has_subscriber(u->meta.manager)) {
 299                 u->meta.sent_dbus_new_signal = true;
 300                 return;
 301         }
 302
 303         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 304         u->meta.in_dbus_queue = true;
 305 }
 306
 307 static void bidi_set_free(Unit *u, Set *s) {
 308         Iterator i;
 309         Unit *other;
 310
 311         assert(u);
 312
 313         /* Frees the set and makes sure we are dropped from the
 314          * inverse pointers */
 315
 316         SET_FOREACH(other, s, i) {
 317                 UnitDependency d;
 318
 319                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 320                         set_remove(other->meta.dependencies[d], u);
 321
 322                 unit_add_to_gc_queue(other);
 323         }
 324
 325         set_free(s);
 326 }
 327
 328 void unit_free(Unit *u) {
 329         UnitDependency d;
 330         Iterator i;
 331         char *t;
 332
 333         assert(u);
 334
 335         bus_unit_send_removed_signal(u);
 336
 337         if (u->meta.load_state != UNIT_STUB)
 338                 if (UNIT_VTABLE(u)->done)
 339                         UNIT_VTABLE(u)->done(u);
 340
 341         SET_FOREACH(t, u->meta.names, i)
 342                 hashmap_remove_value(u->meta.manager->units, t, u);
 343
 344         if (u->meta.job)
 345                 job_free(u->meta.job);
 346
 347         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 348                 bidi_set_free(u, u->meta.dependencies[d]);
 349
 350         if (u->meta.type != _UNIT_TYPE_INVALID)
 351                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 352
 353         if (u->meta.in_load_queue)
 354                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 355
 356         if (u->meta.in_dbus_queue)
 357                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 358
 359         if (u->meta.in_cleanup_queue)
 360                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 361
 362         if (u->meta.in_gc_queue) {
 363                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 364                 u->meta.manager->n_in_gc_queue--;
 365         }
 366
 367         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 368
 369         free(u->meta.description);
 370         free(u->meta.fragment_path);
 371
 372         set_free_free(u->meta.names);
 373
 374         free(u->meta.instance);
 375
 376         free(u);
 377 }
 378
 379 UnitActiveState unit_active_state(Unit *u) {
 380         assert(u);
 381
 382         if (u->meta.load_state == UNIT_MERGED)
 383                 return unit_active_state(unit_follow_merge(u));
 384
 385         /* After a reload it might happen that a unit is not correctly
 386          * loaded but still has a process around. That's why we won't
 387          * shortcut failed loading to UNIT_INACTIVE_MAINTENANCE. */
 388
 389         return UNIT_VTABLE(u)->active_state(u);
 390 }
 391
 392 const char* unit_sub_state_to_string(Unit *u) {
 393         assert(u);
 394
 395         return UNIT_VTABLE(u)->sub_state_to_string(u);
 396 }
 397
 398 static void complete_move(Set **s, Set **other) {
 399         assert(s);
 400         assert(other);
 401
 402         if (!*other)
 403                 return;
 404
 405         if (*s)
 406                 set_move(*s, *other);
 407         else {
 408                 *s = *other;
 409                 *other = NULL;
 410         }
 411 }
 412
 413 static void merge_names(Unit *u, Unit *other) {
 414         char *t;
 415         Iterator i;
 416
 417         assert(u);
 418         assert(other);
 419
 420         complete_move(&u->meta.names, &other->meta.names);
 421
 422         set_free_free(other->meta.names);
 423         other->meta.names = NULL;
 424         other->meta.id = NULL;
 425
 426         SET_FOREACH(t, u->meta.names, i)
 427                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 428 }
 429
 430 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 431         Iterator i;
 432         Unit *back;
 433         int r;
 434
 435         assert(u);
 436         assert(other);
 437         assert(d < _UNIT_DEPENDENCY_MAX);
 438
 439         SET_FOREACH(back, other->meta.dependencies[d], i) {
 440                 UnitDependency k;
 441
 442                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 443                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 444
 445                                 if (r == -EEXIST)
 446                                         set_remove(back->meta.dependencies[k], other);
 447                                 else
 448                                         assert(r == -ENOENT);
 449                         }
 450         }
 451
 452         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 453
 454         set_free(other->meta.dependencies[d]);
 455         other->meta.dependencies[d] = NULL;
 456 }
 457
 458 int unit_merge(Unit *u, Unit *other) {
 459         UnitDependency d;
 460
 461         assert(u);
 462         assert(other);
 463         assert(u->meta.manager == other->meta.manager);
 464         assert(u->meta.type != _UNIT_TYPE_INVALID);
 465
 466         other = unit_follow_merge(other);
 467
 468         if (other == u)
 469                 return 0;
 470
 471         if (u->meta.type != other->meta.type)
 472                 return -EINVAL;
 473
 474         if (!u->meta.instance != !other->meta.instance)
 475                 return -EINVAL;
 476
 477         if (other->meta.load_state != UNIT_STUB &&
 478             other->meta.load_state != UNIT_FAILED)
 479                 return -EEXIST;
 480
 481         if (other->meta.job)
 482                 return -EEXIST;
 483
 484         if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(other)))
 485                 return -EEXIST;
 486
 487         /* Merge names */
 488         merge_names(u, other);
 489
 490         /* Merge dependencies */
 491         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 492                 merge_dependencies(u, other, d);
 493
 494         other->meta.load_state = UNIT_MERGED;
 495         other->meta.merged_into = u;
 496
 497         /* If there is still some data attached to the other node, we
 498          * don't need it anymore, and can free it. */
 499         if (other->meta.load_state != UNIT_STUB)
 500                 if (UNIT_VTABLE(other)->done)
 501                         UNIT_VTABLE(other)->done(other);
 502
 503         unit_add_to_dbus_queue(u);
 504         unit_add_to_cleanup_queue(other);
 505
 506         return 0;
 507 }
 508
 509 int unit_merge_by_name(Unit *u, const char *name) {
 510         Unit *other;
 511         int r;
 512         char *s = NULL;
 513
 514         assert(u);
 515         assert(name);
 516
 517         if (unit_name_is_template(name)) {
 518                 if (!u->meta.instance)
 519                         return -EINVAL;
 520
 521                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 522                         return -ENOMEM;
 523
 524                 name = s;
 525         }
 526
 527         if (!(other = manager_get_unit(u->meta.manager, name)))
 528                 r = unit_add_name(u, name);
 529         else
 530                 r = unit_merge(u, other);
 531
 532         free(s);
 533         return r;
 534 }
 535
 536 Unit* unit_follow_merge(Unit *u) {
 537         assert(u);
 538
 539         while (u->meta.load_state == UNIT_MERGED)
 540                 assert_se(u = u->meta.merged_into);
 541
 542         return u;
 543 }
 544
 545 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 546         int r;
 547
 548         assert(u);
 549         assert(c);
 550
 551         if (c->std_output != EXEC_OUTPUT_KMSG &&
 552             c->std_output != EXEC_OUTPUT_SYSLOG &&
 553             c->std_error != EXEC_OUTPUT_KMSG &&
 554             c->std_error != EXEC_OUTPUT_SYSLOG)
 555                 return 0;
 556
 557         /* If syslog or kernel logging is requested, make sure our own
 558          * logging daemon is run first. */
 559
 560         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 561                 return r;
 562
 563         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 564                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 565                         return r;
 566
 567         return 0;
 568 }
 569
 570 const char *unit_description(Unit *u) {
 571         assert(u);
 572
 573         if (u->meta.description)
 574                 return u->meta.description;
 575
 576         return u->meta.id;
 577 }
 578
 579 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 580         char *t;
 581         UnitDependency d;
 582         Iterator i;
 583         char *p2;
 584         const char *prefix2;
 585         CGroupBonding *b;
 586         char
 587                 timestamp1[FORMAT_TIMESTAMP_MAX],
 588                 timestamp2[FORMAT_TIMESTAMP_MAX],
 589                 timestamp3[FORMAT_TIMESTAMP_MAX],
 590                 timestamp4[FORMAT_TIMESTAMP_MAX];
 591
 592         assert(u);
 593         assert(u->meta.type >= 0);
 594
 595         if (!prefix)
 596                 prefix = "";
 597         p2 = strappend(prefix, "\t");
 598         prefix2 = p2 ? p2 : prefix;
 599
 600         fprintf(f,
 601                 "%s-> Unit %s:\n"
 602                 "%s\tDescription: %s\n"
 603                 "%s\tInstance: %s\n"
 604                 "%s\tUnit Load State: %s\n"
 605                 "%s\tUnit Active State: %s\n"
 606                 "%s\tInactive Exit Timestamp: %s\n"
 607                 "%s\tActive Enter Timestamp: %s\n"
 608                 "%s\tActive Exit Timestamp: %s\n"
 609                 "%s\tInactive Enter Timestamp: %s\n"
 610                 "%s\tGC Check Good: %s\n"
 611                 "%s\tNeed Daemon Reload: %s\n",
 612                 prefix, u->meta.id,
 613                 prefix, unit_description(u),
 614                 prefix, strna(u->meta.instance),
 615                 prefix, unit_load_state_to_string(u->meta.load_state),
 616                 prefix, unit_active_state_to_string(unit_active_state(u)),
 617                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 618                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 619                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 620                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 621                 prefix, yes_no(unit_check_gc(u)),
 622                 prefix, yes_no(unit_need_daemon_reload(u)));
 623
 624         SET_FOREACH(t, u->meta.names, i)
 625                 fprintf(f, "%s\tName: %s\n", prefix, t);
 626
 627         if (u->meta.fragment_path)
 628                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 629
 630         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 631                 Unit *other;
 632
 633                 SET_FOREACH(other, u->meta.dependencies[d], i)
 634                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 635         }
 636
 637         if (u->meta.load_state == UNIT_LOADED) {
 638                 fprintf(f,
 639                         "%s\tRecursive Stop: %s\n"
 640                         "%s\tStopWhenUnneeded: %s\n"
 641                         "%s\tOnlyByDependency: %s\n"
 642                         "%s\tDefaultDependencies: %s\n"
 643                         "%s\tIgnoreDependencyFailure: %s\n",
 644                         prefix, yes_no(u->meta.recursive_stop),
 645                         prefix, yes_no(u->meta.stop_when_unneeded),
 646                         prefix, yes_no(u->meta.only_by_dependency),
 647                         prefix, yes_no(u->meta.default_dependencies),
 648                         prefix, yes_no(u->meta.ignore_dependency_failure));
 649
 650                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 651                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 652                                 prefix, b->controller, b->path);
 653
 654                 if (UNIT_VTABLE(u)->dump)
 655                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 656
 657         } else if (u->meta.load_state == UNIT_MERGED)
 658                 fprintf(f,
 659                         "%s\tMerged into: %s\n",
 660                         prefix, u->meta.merged_into->meta.id);
 661
 662         if (u->meta.job)
 663                 job_dump(u->meta.job, f, prefix2);
 664
 665         free(p2);
 666 }
 667
 668 /* Common implementation for multiple backends */
 669 int unit_load_fragment_and_dropin(Unit *u) {
 670         int r;
 671
 672         assert(u);
 673
 674         /* Load a .service file */
 675         if ((r = unit_load_fragment(u)) < 0)
 676                 return r;
 677
 678         if (u->meta.load_state == UNIT_STUB)
 679                 return -ENOENT;
 680
 681         /* Load drop-in directory data */
 682         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 683                 return r;
 684
 685         return 0;
 686 }
 687
 688 /* Common implementation for multiple backends */
 689 int unit_load_fragment_and_dropin_optional(Unit *u) {
 690         int r;
 691
 692         assert(u);
 693
 694         /* Same as unit_load_fragment_and_dropin(), but whether
 695          * something can be loaded or not doesn't matter. */
 696
 697         /* Load a .service file */
 698         if ((r = unit_load_fragment(u)) < 0)
 699                 return r;
 700
 701         if (u->meta.load_state == UNIT_STUB)
 702                 u->meta.load_state = UNIT_LOADED;
 703
 704         /* Load drop-in directory data */
 705         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 706                 return r;
 707
 708         return 0;
 709 }
 710
 711 /* Common implementation for multiple backends */
 712 int unit_load_nop(Unit *u) {
 713         assert(u);
 714
 715         if (u->meta.load_state == UNIT_STUB)
 716                 u->meta.load_state = UNIT_LOADED;
 717
 718         return 0;
 719 }
 720
 721 int unit_load(Unit *u) {
 722         int r;
 723
 724         assert(u);
 725
 726         if (u->meta.in_load_queue) {
 727                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 728                 u->meta.in_load_queue = false;
 729         }
 730
 731         if (u->meta.type == _UNIT_TYPE_INVALID)
 732                 return -EINVAL;
 733
 734         if (u->meta.load_state != UNIT_STUB)
 735                 return 0;
 736
 737         if (UNIT_VTABLE(u)->load)
 738                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 739                         goto fail;
 740
 741         if (u->meta.load_state == UNIT_STUB) {
 742                 r = -ENOENT;
 743                 goto fail;
 744         }
 745
 746         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 747
 748         unit_add_to_dbus_queue(unit_follow_merge(u));
 749         unit_add_to_gc_queue(u);
 750
 751         return 0;
 752
 753 fail:
 754         u->meta.load_state = UNIT_FAILED;
 755         unit_add_to_dbus_queue(u);
 756
 757         log_notice("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 758
 759         return r;
 760 }
 761
 762 /* Errors:
 763  *         -EBADR:     This unit type does not support starting.
 764  *         -EALREADY:  Unit is already started.
 765  *         -EAGAIN:    An operation is already in progress. Retry later.
 766  *         -ECANCELED: Too many requests for now.
 767  */
 768 int unit_start(Unit *u) {
 769         UnitActiveState state;
 770
 771         assert(u);
 772
 773         if (u->meta.load_state != UNIT_LOADED)
 774                 return -EINVAL;
 775
 776         /* If this is already (being) started, then this will
 777          * succeed. Note that this will even succeed if this unit is
 778          * not startable by the user. This is relied on to detect when
 779          * we need to wait for units and when waiting is finished. */
 780         state = unit_active_state(u);
 781         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 782                 return -EALREADY;
 783
 784         /* If it is stopped, but we cannot start it, then fail */
 785         if (!UNIT_VTABLE(u)->start)
 786                 return -EBADR;
 787
 788         /* We don't suppress calls to ->start() here when we are
 789          * already starting, to allow this request to be used as a
 790          * "hurry up" call, for example when the unit is in some "auto
 791          * restart" state where it waits for a holdoff timer to elapse
 792          * before it will start again. */
 793
 794         unit_add_to_dbus_queue(u);
 795
 796         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 797
 798         return UNIT_VTABLE(u)->start(u);
 799 }
 800
 801 bool unit_can_start(Unit *u) {
 802         assert(u);
 803
 804         return !!UNIT_VTABLE(u)->start;
 805 }
 806
 807 /* Errors:
 808  *         -EBADR:    This unit type does not support stopping.
 809  *         -EALREADY: Unit is already stopped.
 810  *         -EAGAIN:   An operation is already in progress. Retry later.
 811  */
 812 int unit_stop(Unit *u) {
 813         UnitActiveState state;
 814
 815         assert(u);
 816
 817         state = unit_active_state(u);
 818         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
 819                 return -EALREADY;
 820
 821         if (!UNIT_VTABLE(u)->stop)
 822                 return -EBADR;
 823
 824         unit_add_to_dbus_queue(u);
 825
 826         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 827
 828         return UNIT_VTABLE(u)->stop(u);
 829 }
 830
 831 /* Errors:
 832  *         -EBADR:    This unit type does not support reloading.
 833  *         -ENOEXEC:  Unit is not started.
 834  *         -EAGAIN:   An operation is already in progress. Retry later.
 835  */
 836 int unit_reload(Unit *u) {
 837         UnitActiveState state;
 838
 839         assert(u);
 840
 841         if (u->meta.load_state != UNIT_LOADED)
 842                 return -EINVAL;
 843
 844         if (!unit_can_reload(u))
 845                 return -EBADR;
 846
 847         state = unit_active_state(u);
 848         if (unit_active_state(u) == UNIT_RELOADING)
 849                 return -EALREADY;
 850
 851         if (unit_active_state(u) != UNIT_ACTIVE)
 852                 return -ENOEXEC;
 853
 854         unit_add_to_dbus_queue(u);
 855         return UNIT_VTABLE(u)->reload(u);
 856 }
 857
 858 bool unit_can_reload(Unit *u) {
 859         assert(u);
 860
 861         if (!UNIT_VTABLE(u)->reload)
 862                 return false;
 863
 864         if (!UNIT_VTABLE(u)->can_reload)
 865                 return true;
 866
 867         return UNIT_VTABLE(u)->can_reload(u);
 868 }
 869
 870 static void unit_check_uneeded(Unit *u) {
 871         Iterator i;
 872         Unit *other;
 873
 874         assert(u);
 875
 876         /* If this service shall be shut down when unneeded then do
 877          * so. */
 878
 879         if (!u->meta.stop_when_unneeded)
 880                 return;
 881
 882         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 883                 return;
 884
 885         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 886                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 887                         return;
 888
 889         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 890                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 891                         return;
 892
 893         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 894                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 895                         return;
 896
 897         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 898
 899         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 900         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 901 }
 902
 903 static void retroactively_start_dependencies(Unit *u) {
 904         Iterator i;
 905         Unit *other;
 906
 907         assert(u);
 908         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 909
 910         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 911                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 912                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 913
 914         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 915                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 916                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 917
 918         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 919                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 920                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 921
 922         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 923                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 924                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 925
 926         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 927                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 928                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 929 }
 930
 931 static void retroactively_stop_dependencies(Unit *u) {
 932         Iterator i;
 933         Unit *other;
 934
 935         assert(u);
 936         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 937
 938         if (u->meta.recursive_stop) {
 939                 /* Pull down units need us recursively if enabled */
 940                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 941                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 942                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 943         }
 944
 945         /* Garbage collect services that might not be needed anymore, if enabled */
 946         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 947                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 948                         unit_check_uneeded(other);
 949         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 950                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 951                         unit_check_uneeded(other);
 952         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 953                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 954                         unit_check_uneeded(other);
 955         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 956                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 957                         unit_check_uneeded(other);
 958         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
 959                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 960                         unit_check_uneeded(other);
 961 }
 962
 963 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 964         dual_timestamp ts;
 965         bool unexpected;
 966
 967         assert(u);
 968         assert(os < _UNIT_ACTIVE_STATE_MAX);
 969         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 970
 971         /* Note that this is called for all low-level state changes,
 972          * even if they might map to the same high-level
 973          * UnitActiveState! That means that ns == os is OK an expected
 974          * behaviour here. For example: if a mount point is remounted
 975          * this function will be called too and the utmp code below
 976          * relies on that! */
 977
 978         dual_timestamp_get(&ts);
 979
 980         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 981                 u->meta.inactive_exit_timestamp = ts;
 982         else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 983                 u->meta.inactive_enter_timestamp = ts;
 984
 985         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 986                 u->meta.active_enter_timestamp = ts;
 987         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 988                 u->meta.active_exit_timestamp = ts;
 989
 990         if (UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
 991                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
 992
 993         timer_unit_notify(u, ns);
 994         path_unit_notify(u, ns);
 995
 996         if (u->meta.job) {
 997                 unexpected = false;
 998
 999                 if (u->meta.job->state == JOB_WAITING)
1000
1001                         /* So we reached a different state for this
1002                          * job. Let's see if we can run it now if it
1003                          * failed previously due to EAGAIN. */
1004                         job_add_to_run_queue(u->meta.job);
1005
1006
1007                 /* Let's check whether this state change constitutes a
1008                  * finished job, or maybe cotradicts a running job and
1009                  * hence needs to invalidate jobs. */
1010
1011                 switch (u->meta.job->type) {
1012
1013                 case JOB_START:
1014                 case JOB_VERIFY_ACTIVE:
1015
1016                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1017                                 job_finish_and_invalidate(u->meta.job, true);
1018                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1019                                 unexpected = true;
1020                                 job_finish_and_invalidate(u->meta.job, false);
1021                         }
1022
1023                         break;
1024
1025                 case JOB_RELOAD:
1026                 case JOB_RELOAD_OR_START:
1027
1028                         if (u->meta.job->state == JOB_RUNNING) {
1029                                 if (ns == UNIT_ACTIVE)
1030                                         job_finish_and_invalidate(u->meta.job, true);
1031                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1032                                         unexpected = true;
1033                                         job_finish_and_invalidate(u->meta.job, false);
1034                                 }
1035                         }
1036
1037                         break;
1038
1039                 case JOB_STOP:
1040                 case JOB_RESTART:
1041                 case JOB_TRY_RESTART:
1042
1043                         if (ns == UNIT_INACTIVE || ns == UNIT_MAINTENANCE)
1044                                 job_finish_and_invalidate(u->meta.job, true);
1045                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1046                                 unexpected = true;
1047                                 job_finish_and_invalidate(u->meta.job, false);
1048                         }
1049
1050                         break;
1051
1052                 default:
1053                         assert_not_reached("Job type unknown");
1054                 }
1055
1056         } else
1057                 unexpected = true;
1058
1059         /* If this state change happened without being requested by a
1060          * job, then let's retroactively start or stop
1061          * dependencies. We skip that step when deserializing, since
1062          * we don't want to create any additional jobs just because
1063          * something is already activated. */
1064
1065         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1066                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1067                         retroactively_start_dependencies(u);
1068                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1069                         retroactively_stop_dependencies(u);
1070         }
1071
1072         if (ns != os && ns == UNIT_MAINTENANCE) {
1073                 Iterator i;
1074                 Unit *other;
1075
1076                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1077                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1078
1079                 log_notice("Unit %s entered maintenance state.", u->meta.id);
1080         }
1081
1082         /* Some names are special */
1083         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1084                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1085                         /* The bus just might have become available,
1086                          * hence try to connect to it, if we aren't
1087                          * yet connected. */
1088                         bus_init(u->meta.manager);
1089                 }
1090
1091                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1092                         /* The syslog daemon just might have become
1093                          * available, hence try to connect to it, if
1094                          * we aren't yet connected. */
1095                         log_open();
1096
1097                 if (u->meta.type == UNIT_MOUNT)
1098                         /* Another directory became available, let's
1099                          * check if that is enough to write our utmp
1100                          * entry. */
1101                         manager_write_utmp_reboot(u->meta.manager);
1102
1103                 if (u->meta.type == UNIT_TARGET)
1104                         /* A target got activated, maybe this is a runlevel? */
1105                         manager_write_utmp_runlevel(u->meta.manager, u);
1106
1107         } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1108
1109                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1110                         /* The syslog daemon might just have
1111                          * terminated, hence try to disconnect from
1112                          * it. */
1113                         log_close_syslog();
1114
1115                 /* We don't care about D-Bus here, since we'll get an
1116                  * asynchronous notification for it anyway. */
1117         }
1118
1119         /* Maybe we finished startup and are now ready for being
1120          * stopped because unneeded? */
1121         unit_check_uneeded(u);
1122
1123         unit_add_to_dbus_queue(u);
1124         unit_add_to_gc_queue(u);
1125 }
1126
1127 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1128         struct epoll_event ev;
1129
1130         assert(u);
1131         assert(fd >= 0);
1132         assert(w);
1133         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1134
1135         zero(ev);
1136         ev.data.ptr = w;
1137         ev.events = events;
1138
1139         if (epoll_ctl(u->meta.manager->epoll_fd,
1140                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1141                       fd,
1142                       &ev) < 0)
1143                 return -errno;
1144
1145         w->fd = fd;
1146         w->type = WATCH_FD;
1147         w->data.unit = u;
1148
1149         return 0;
1150 }
1151
1152 void unit_unwatch_fd(Unit *u, Watch *w) {
1153         assert(u);
1154         assert(w);
1155
1156         if (w->type == WATCH_INVALID)
1157                 return;
1158
1159         assert(w->type == WATCH_FD);
1160         assert(w->data.unit == u);
1161         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1162
1163         w->fd = -1;
1164         w->type = WATCH_INVALID;
1165         w->data.unit = NULL;
1166 }
1167
1168 int unit_watch_pid(Unit *u, pid_t pid) {
1169         assert(u);
1170         assert(pid >= 1);
1171
1172         /* Watch a specific PID. We only support one unit watching
1173          * each PID for now. */
1174
1175         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1176 }
1177
1178 void unit_unwatch_pid(Unit *u, pid_t pid) {
1179         assert(u);
1180         assert(pid >= 1);
1181
1182         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1183 }
1184
1185 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1186         struct itimerspec its;
1187         int flags, fd;
1188         bool ours;
1189
1190         assert(u);
1191         assert(w);
1192         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1193
1194         /* This will try to reuse the old timer if there is one */
1195
1196         if (w->type == WATCH_TIMER) {
1197                 ours = false;
1198                 fd = w->fd;
1199         } else {
1200                 ours = true;
1201                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1202                         return -errno;
1203         }
1204
1205         zero(its);
1206
1207         if (delay <= 0) {
1208                 /* Set absolute time in the past, but not 0, since we
1209                  * don't want to disarm the timer */
1210                 its.it_value.tv_sec = 0;
1211                 its.it_value.tv_nsec = 1;
1212
1213                 flags = TFD_TIMER_ABSTIME;
1214         } else {
1215                 timespec_store(&its.it_value, delay);
1216                 flags = 0;
1217         }
1218
1219         /* This will also flush the elapse counter */
1220         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1221                 goto fail;
1222
1223         if (w->type == WATCH_INVALID) {
1224                 struct epoll_event ev;
1225
1226                 zero(ev);
1227                 ev.data.ptr = w;
1228                 ev.events = EPOLLIN;
1229
1230                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1231                         goto fail;
1232         }
1233
1234         w->fd = fd;
1235         w->type = WATCH_TIMER;
1236         w->data.unit = u;
1237
1238         return 0;
1239
1240 fail:
1241         if (ours)
1242                 close_nointr_nofail(fd);
1243
1244         return -errno;
1245 }
1246
1247 void unit_unwatch_timer(Unit *u, Watch *w) {
1248         assert(u);
1249         assert(w);
1250
1251         if (w->type == WATCH_INVALID)
1252                 return;
1253
1254         assert(w->type == WATCH_TIMER && w->data.unit == u);
1255
1256         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1257         close_nointr_nofail(w->fd);
1258
1259         w->fd = -1;
1260         w->type = WATCH_INVALID;
1261         w->data.unit = NULL;
1262 }
1263
1264 bool unit_job_is_applicable(Unit *u, JobType j) {
1265         assert(u);
1266         assert(j >= 0 && j < _JOB_TYPE_MAX);
1267
1268         switch (j) {
1269
1270         case JOB_VERIFY_ACTIVE:
1271         case JOB_START:
1272                 return true;
1273
1274         case JOB_STOP:
1275         case JOB_RESTART:
1276         case JOB_TRY_RESTART:
1277                 return unit_can_start(u);
1278
1279         case JOB_RELOAD:
1280                 return unit_can_reload(u);
1281
1282         case JOB_RELOAD_OR_START:
1283                 return unit_can_reload(u) && unit_can_start(u);
1284
1285         default:
1286                 assert_not_reached("Invalid job type");
1287         }
1288 }
1289
1290 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1291
1292         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1293                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1294                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1295                 [UNIT_WANTS] = UNIT_WANTED_BY,
1296                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1297                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1298                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1299                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1300                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1301                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1302                 [UNIT_BEFORE] = UNIT_AFTER,
1303                 [UNIT_AFTER] = UNIT_BEFORE,
1304                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1305                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1306                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1307         };
1308         int r, q = 0, v = 0, w = 0;
1309
1310         assert(u);
1311         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1312         assert(other);
1313
1314         /* We won't allow dependencies on ourselves. We will not
1315          * consider them an error however. */
1316         if (u == other)
1317                 return 0;
1318
1319         if (UNIT_VTABLE(u)->no_requires &&
1320             (d == UNIT_REQUIRES ||
1321              d == UNIT_REQUIRES_OVERRIDABLE ||
1322              d == UNIT_REQUISITE ||
1323              d == UNIT_REQUISITE_OVERRIDABLE)) {
1324                     return -EINVAL;
1325         }
1326
1327         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1328                 return r;
1329
1330         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1331                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1332                         return r;
1333
1334         if (add_reference)
1335                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1336                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1337                         return r;
1338
1339         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1340                 return q;
1341
1342         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1343                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1344                         r = v;
1345                         goto fail;
1346                 }
1347
1348         if (add_reference) {
1349                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1350                         r = w;
1351                         goto fail;
1352                 }
1353
1354                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1355                         goto fail;
1356         }
1357
1358         unit_add_to_dbus_queue(u);
1359         return 0;
1360
1361 fail:
1362         if (q > 0)
1363                 set_remove(u->meta.dependencies[d], other);
1364
1365         if (v > 0)
1366                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1367
1368         if (w > 0)
1369                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1370
1371         return r;
1372 }
1373
1374 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1375         int r;
1376
1377         assert(u);
1378
1379         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1380                 return r;
1381
1382         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1383                 return r;
1384
1385         return 0;
1386 }
1387
1388 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1389         char *s;
1390
1391         assert(u);
1392         assert(name || path);
1393
1394         if (!name)
1395                 name = file_name_from_path(path);
1396
1397         if (!unit_name_is_template(name)) {
1398                 *p = NULL;
1399                 return name;
1400         }
1401
1402         if (u->meta.instance)
1403                 s = unit_name_replace_instance(name, u->meta.instance);
1404         else {
1405                 char *i;
1406
1407                 if (!(i = unit_name_to_prefix(u->meta.id)))
1408                         return NULL;
1409
1410                 s = unit_name_replace_instance(name, i);
1411                 free(i);
1412         }
1413
1414         if (!s)
1415                 return NULL;
1416
1417         *p = s;
1418         return s;
1419 }
1420
1421 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1422         Unit *other;
1423         int r;
1424         char *s;
1425
1426         assert(u);
1427         assert(name || path);
1428
1429         if (!(name = resolve_template(u, name, path, &s)))
1430                 return -ENOMEM;
1431
1432         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1433                 goto finish;
1434
1435         r = unit_add_dependency(u, d, other, add_reference);
1436
1437 finish:
1438         free(s);
1439         return r;
1440 }
1441
1442 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1443         Unit *other;
1444         int r;
1445         char *s;
1446
1447         assert(u);
1448         assert(name || path);
1449
1450         if (!(name = resolve_template(u, name, path, &s)))
1451                 return -ENOMEM;
1452
1453         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1454                 goto finish;
1455
1456         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1457
1458 finish:
1459         free(s);
1460         return r;
1461 }
1462
1463 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1464         Unit *other;
1465         int r;
1466         char *s;
1467
1468         assert(u);
1469         assert(name || path);
1470
1471         if (!(name = resolve_template(u, name, path, &s)))
1472                 return -ENOMEM;
1473
1474         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1475                 goto finish;
1476
1477         r = unit_add_dependency(other, d, u, add_reference);
1478
1479 finish:
1480         free(s);
1481         return r;
1482 }
1483
1484 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1485         Unit *other;
1486         int r;
1487         char *s;
1488
1489         assert(u);
1490         assert(name || path);
1491
1492         if (!(name = resolve_template(u, name, path, &s)))
1493                 return -ENOMEM;
1494
1495         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1496                 goto finish;
1497
1498         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1499                 goto finish;
1500
1501 finish:
1502         free(s);
1503         return r;
1504 }
1505
1506 int set_unit_path(const char *p) {
1507         char *cwd, *c;
1508         int r;
1509
1510         /* This is mostly for debug purposes */
1511
1512         if (path_is_absolute(p)) {
1513                 if (!(c = strdup(p)))
1514                         return -ENOMEM;
1515         } else {
1516                 if (!(cwd = get_current_dir_name()))
1517                         return -errno;
1518
1519                 r = asprintf(&c, "%s/%s", cwd, p);
1520                 free(cwd);
1521
1522                 if (r < 0)
1523                         return -ENOMEM;
1524         }
1525
1526         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1527                 r = -errno;
1528                 free(c);
1529                 return r;
1530         }
1531
1532         return 0;
1533 }
1534
1535 char *unit_dbus_path(Unit *u) {
1536         char *p, *e;
1537
1538         assert(u);
1539
1540         if (!(e = bus_path_escape(u->meta.id)))
1541                 return NULL;
1542
1543         p = strappend("/org/freedesktop/systemd1/unit/", e);
1544         free(e);
1545
1546         return p;
1547 }
1548
1549 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1550         CGroupBonding *l;
1551         int r;
1552
1553         assert(u);
1554         assert(b);
1555
1556         assert(b->path);
1557
1558         if (!b->controller)
1559                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1560                         return -ENOMEM;
1561
1562         /* Ensure this hasn't been added yet */
1563         assert(!b->unit);
1564
1565         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1566         LIST_PREPEND(CGroupBonding, by_path, l, b);
1567
1568         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1569                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1570                 return r;
1571         }
1572
1573         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1574         b->unit = u;
1575
1576         return 0;
1577 }
1578
1579 static char *default_cgroup_path(Unit *u) {
1580         char *p;
1581         int r;
1582
1583         assert(u);
1584
1585         if (u->meta.instance) {
1586                 char *t;
1587
1588                 if (!(t = unit_name_template(u->meta.id)))
1589                         return NULL;
1590
1591                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1592                 free(t);
1593         } else
1594                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1595
1596         return r < 0 ? NULL : p;
1597 }
1598
1599 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1600         char *controller = NULL, *path = NULL;
1601         CGroupBonding *b = NULL;
1602         int r;
1603
1604         assert(u);
1605         assert(name);
1606
1607         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1608                 return r;
1609
1610         if (!path)
1611                 path = default_cgroup_path(u);
1612
1613         if (!controller)
1614                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1615
1616         if (!path || !controller) {
1617                 free(path);
1618                 free(controller);
1619
1620                 return -ENOMEM;
1621         }
1622
1623         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1624                 r = -EEXIST;
1625                 goto fail;
1626         }
1627
1628         if (!(b = new0(CGroupBonding, 1))) {
1629                 r = -ENOMEM;
1630                 goto fail;
1631         }
1632
1633         b->controller = controller;
1634         b->path = path;
1635         b->only_us = false;
1636         b->clean_up = false;
1637
1638         if ((r = unit_add_cgroup(u, b)) < 0)
1639                 goto fail;
1640
1641         return 0;
1642
1643 fail:
1644         free(path);
1645         free(controller);
1646         free(b);
1647
1648         return r;
1649 }
1650
1651 int unit_add_default_cgroup(Unit *u) {
1652         CGroupBonding *b;
1653         int r = -ENOMEM;
1654
1655         assert(u);
1656
1657         /* Adds in the default cgroup data, if it wasn't specified yet */
1658
1659         if (unit_get_default_cgroup(u))
1660                 return 0;
1661
1662         if (!(b = new0(CGroupBonding, 1)))
1663                 return -ENOMEM;
1664
1665         if (!(b->path = default_cgroup_path(u)))
1666                 goto fail;
1667
1668         b->clean_up = true;
1669         b->only_us = true;
1670
1671         if ((r = unit_add_cgroup(u, b)) < 0)
1672                 goto fail;
1673
1674         return 0;
1675
1676 fail:
1677         free(b->path);
1678         free(b->controller);
1679         free(b);
1680
1681         return r;
1682 }
1683
1684 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1685         assert(u);
1686
1687         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1688 }
1689
1690 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1691         char *t;
1692         int r;
1693
1694         assert(u);
1695         assert(type);
1696         assert(_found);
1697
1698         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1699                 return -ENOMEM;
1700
1701         assert(!unit_has_name(u, t));
1702
1703         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1704         free(t);
1705
1706         assert(r < 0 || *_found != u);
1707
1708         return r;
1709 }
1710
1711 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1712         Unit *found;
1713         char *t;
1714
1715         assert(u);
1716         assert(type);
1717         assert(_found);
1718
1719         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1720                 return -ENOMEM;
1721
1722         assert(!unit_has_name(u, t));
1723
1724         found = manager_get_unit(u->meta.manager, t);
1725         free(t);
1726
1727         if (!found)
1728                 return -ENOENT;
1729
1730         *_found = found;
1731         return 0;
1732 }
1733
1734 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1735         Unit *u = userdata;
1736         assert(u);
1737
1738         return unit_name_to_prefix_and_instance(u->meta.id);
1739 }
1740
1741 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1742         Unit *u = userdata;
1743         assert(u);
1744
1745         return unit_name_to_prefix(u->meta.id);
1746 }
1747
1748 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1749         Unit *u = userdata;
1750         char *p, *r;
1751
1752         assert(u);
1753
1754         if (!(p = unit_name_to_prefix(u->meta.id)))
1755                 return NULL;
1756
1757         r = unit_name_unescape(p);
1758         free(p);
1759
1760         return r;
1761 }
1762
1763 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1764         Unit *u = userdata;
1765         assert(u);
1766
1767         if (u->meta.instance)
1768                 return unit_name_unescape(u->meta.instance);
1769
1770         return strdup("");
1771 }
1772
1773 char *unit_name_printf(Unit *u, const char* format) {
1774
1775         /*
1776          * This will use the passed string as format string and
1777          * replace the following specifiers:
1778          *
1779          * %n: the full id of the unit                 (foo@bar.waldo)
1780          * %N: the id of the unit without the suffix   (foo@bar)
1781          * %p: the prefix                              (foo)
1782          * %i: the instance                            (bar)
1783          */
1784
1785         const Specifier table[] = {
1786                 { 'n', specifier_string,              u->meta.id },
1787                 { 'N', specifier_prefix_and_instance, NULL },
1788                 { 'p', specifier_prefix,              NULL },
1789                 { 'i', specifier_string,              u->meta.instance },
1790                 { 0, NULL, NULL }
1791         };
1792
1793         assert(u);
1794         assert(format);
1795
1796         return specifier_printf(format, table, u);
1797 }
1798
1799 char *unit_full_printf(Unit *u, const char *format) {
1800
1801         /* This is similar to unit_name_printf() but also supports
1802          * unescaping */
1803
1804         const Specifier table[] = {
1805                 { 'n', specifier_string,              u->meta.id },
1806                 { 'N', specifier_prefix_and_instance, NULL },
1807                 { 'p', specifier_prefix,              NULL },
1808                 { 'P', specifier_prefix_unescaped,    NULL },
1809                 { 'i', specifier_string,              u->meta.instance },
1810                 { 'I', specifier_instance_unescaped,  NULL },
1811                 { 0, NULL, NULL }
1812         };
1813
1814         assert(u);
1815         assert(format);
1816
1817         return specifier_printf(format, table, u);
1818 }
1819
1820 char **unit_full_printf_strv(Unit *u, char **l) {
1821         size_t n;
1822         char **r, **i, **j;
1823
1824         /* Applies unit_full_printf to every entry in l */
1825
1826         assert(u);
1827
1828         n = strv_length(l);
1829         if (!(r = new(char*, n+1)))
1830                 return NULL;
1831
1832         for (i = l, j = r; *i; i++, j++)
1833                 if (!(*j = unit_full_printf(u, *i)))
1834                         goto fail;
1835
1836         *j = NULL;
1837         return r;
1838
1839 fail:
1840         j--;
1841         while (j >= r)
1842                 free(*j);
1843
1844         free(r);
1845
1846         return NULL;
1847 }
1848
1849 int unit_watch_bus_name(Unit *u, const char *name) {
1850         assert(u);
1851         assert(name);
1852
1853         /* Watch a specific name on the bus. We only support one unit
1854          * watching each name for now. */
1855
1856         return hashmap_put(u->meta.manager->watch_bus, name, u);
1857 }
1858
1859 void unit_unwatch_bus_name(Unit *u, const char *name) {
1860         assert(u);
1861         assert(name);
1862
1863         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1864 }
1865
1866 bool unit_can_serialize(Unit *u) {
1867         assert(u);
1868
1869         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1870 }
1871
1872 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1873         int r;
1874
1875         assert(u);
1876         assert(f);
1877         assert(fds);
1878
1879         if (!unit_can_serialize(u))
1880                 return 0;
1881
1882         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1883                 return r;
1884
1885         if (u->meta.job)
1886                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1887
1888         /* End marker */
1889         fputc('\n', f);
1890         return 0;
1891 }
1892
1893 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1894         va_list ap;
1895
1896         assert(u);
1897         assert(f);
1898         assert(key);
1899         assert(format);
1900
1901         fputs(key, f);
1902         fputc('=', f);
1903
1904         va_start(ap, format);
1905         vfprintf(f, format, ap);
1906         va_end(ap);
1907
1908         fputc('\n', f);
1909 }
1910
1911 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1912         assert(u);
1913         assert(f);
1914         assert(key);
1915         assert(value);
1916
1917         fprintf(f, "%s=%s\n", key, value);
1918 }
1919
1920 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1921         int r;
1922
1923         assert(u);
1924         assert(f);
1925         assert(fds);
1926
1927         if (!unit_can_serialize(u))
1928                 return 0;
1929
1930         for (;;) {
1931                 char line[1024], *l, *v;
1932                 size_t k;
1933
1934                 if (!fgets(line, sizeof(line), f)) {
1935                         if (feof(f))
1936                                 return 0;
1937                         return -errno;
1938                 }
1939
1940                 l = strstrip(line);
1941
1942                 /* End marker */
1943                 if (l[0] == 0)
1944                         return 0;
1945
1946                 k = strcspn(l, "=");
1947
1948                 if (l[k] == '=') {
1949                         l[k] = 0;
1950                         v = l+k+1;
1951                 } else
1952                         v = l+k;
1953
1954                 if (streq(l, "job")) {
1955                         JobType type;
1956
1957                         if ((type = job_type_from_string(v)) < 0)
1958                                 log_debug("Failed to parse job type value %s", v);
1959                         else
1960                                 u->meta.deserialized_job = type;
1961
1962                         continue;
1963                 }
1964
1965                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1966                         return r;
1967         }
1968 }
1969
1970 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1971         Unit *device;
1972         char *e;
1973         int r;
1974
1975         assert(u);
1976
1977         if (!what)
1978                 return 0;
1979
1980         /* Adds in links to the device node that this unit is based on */
1981
1982         if (!is_device_path(what))
1983                 return 0;
1984
1985         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1986                 return -ENOMEM;
1987
1988         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
1989         free(e);
1990
1991         if (r < 0)
1992                 return r;
1993
1994         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
1995                 return r;
1996
1997         if (wants)
1998                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1999                         return r;
2000
2001         return 0;
2002 }
2003
2004 int unit_coldplug(Unit *u) {
2005         int r;
2006
2007         assert(u);
2008
2009         if (UNIT_VTABLE(u)->coldplug)
2010                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2011                         return r;
2012
2013         if (u->meta.deserialized_job >= 0) {
2014                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2015                         return r;
2016
2017                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2018         }
2019
2020         return 0;
2021 }
2022
2023 void unit_status_printf(Unit *u, const char *format, ...) {
2024         va_list ap;
2025
2026         assert(u);
2027         assert(format);
2028
2029         if (!UNIT_VTABLE(u)->show_status)
2030                 return;
2031
2032         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2033                 return;
2034
2035         if (!u->meta.manager->show_status)
2036                 return;
2037
2038         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2039                 return;
2040
2041         va_start(ap, format);
2042         status_vprintf(format, ap);
2043         va_end(ap);
2044 }
2045
2046 bool unit_need_daemon_reload(Unit *u) {
2047         struct stat st;
2048
2049         assert(u);
2050
2051         if (!u->meta.fragment_path)
2052                 return false;
2053
2054         zero(st);
2055         if (stat(u->meta.fragment_path, &st) < 0)
2056                 /* What, cannot access this anymore? */
2057                 return true;
2058
2059         return
2060                 u->meta.fragment_mtime &&
2061                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2062 }
2063
2064 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
2065         [UNIT_SERVICE] = "service",
2066         [UNIT_TIMER] = "timer",
2067         [UNIT_SOCKET] = "socket",
2068         [UNIT_TARGET] = "target",
2069         [UNIT_DEVICE] = "device",
2070         [UNIT_MOUNT] = "mount",
2071         [UNIT_AUTOMOUNT] = "automount",
2072         [UNIT_SNAPSHOT] = "snapshot",
2073         [UNIT_SWAP] = "swap"
2074 };
2075
2076 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
2077
2078 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2079         [UNIT_STUB] = "stub",
2080         [UNIT_LOADED] = "loaded",
2081         [UNIT_FAILED] = "failed",
2082         [UNIT_MERGED] = "merged"
2083 };
2084
2085 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2086
2087 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2088         [UNIT_ACTIVE] = "active",
2089         [UNIT_RELOADING] = "reloading",
2090         [UNIT_INACTIVE] = "inactive",
2091         [UNIT_MAINTENANCE] = "maintenance",
2092         [UNIT_ACTIVATING] = "activating",
2093         [UNIT_DEACTIVATING] = "deactivating"
2094 };
2095
2096 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2097
2098 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2099         [UNIT_REQUIRES] = "Requires",
2100         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2101         [UNIT_WANTS] = "Wants",
2102         [UNIT_REQUISITE] = "Requisite",
2103         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2104         [UNIT_REQUIRED_BY] = "RequiredBy",
2105         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2106         [UNIT_WANTED_BY] = "WantedBy",
2107         [UNIT_CONFLICTS] = "Conflicts",
2108         [UNIT_BEFORE] = "Before",
2109         [UNIT_AFTER] = "After",
2110         [UNIT_REFERENCES] = "References",
2111         [UNIT_REFERENCED_BY] = "ReferencedBy",
2112         [UNIT_ON_FAILURE] = "OnFailure"
2113 };
2114
2115 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2116
2117 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2118         [KILL_CONTROL_GROUP] = "control-group",
2119         [KILL_PROCESS_GROUP] = "process-group",
2120         [KILL_PROCESS] = "process",
2121         [KILL_NONE] = "none"
2122 };
2123
2124 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);