src/unit.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44 #include "missing.h"
  45
  46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  47         [UNIT_SERVICE] = &service_vtable,
  48         [UNIT_TIMER] = &timer_vtable,
  49         [UNIT_SOCKET] = &socket_vtable,
  50         [UNIT_TARGET] = &target_vtable,
  51         [UNIT_DEVICE] = &device_vtable,
  52         [UNIT_MOUNT] = &mount_vtable,
  53         [UNIT_AUTOMOUNT] = &automount_vtable,
  54         [UNIT_SNAPSHOT] = &snapshot_vtable,
  55         [UNIT_SWAP] = &swap_vtable,
  56         [UNIT_PATH] = &path_vtable
  57 };
  58
  59 Unit *unit_new(Manager *m) {
  60         Unit *u;
  61
  62         assert(m);
  63
  64         if (!(u = new0(Unit, 1)))
  65                 return NULL;
  66
  67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  68                 free(u);
  69                 return NULL;
  70         }
  71
  72         u->meta.manager = m;
  73         u->meta.type = _UNIT_TYPE_INVALID;
  74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  75         u->meta.default_dependencies = true;
  76
  77         return u;
  78 }
  79
  80 bool unit_has_name(Unit *u, const char *name) {
  81         assert(u);
  82         assert(name);
  83
  84         return !!set_get(u->meta.names, (char*) name);
  85 }
  86
  87 int unit_add_name(Unit *u, const char *text) {
  88         UnitType t;
  89         char *s, *i = NULL;
  90         int r;
  91
  92         assert(u);
  93         assert(text);
  94
  95         if (unit_name_is_template(text)) {
  96                 if (!u->meta.instance)
  97                         return -EINVAL;
  98
  99                 s = unit_name_replace_instance(text, u->meta.instance);
 100         } else
 101                 s = strdup(text);
 102
 103         if (!s)
 104                 return -ENOMEM;
 105
 106         if (!unit_name_is_valid(s)) {
 107                 r = -EINVAL;
 108                 goto fail;
 109         }
 110
 111         assert_se((t = unit_name_to_type(s)) >= 0);
 112
 113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 114                 r = -EINVAL;
 115                 goto fail;
 116         }
 117
 118         if ((r = unit_name_to_instance(s, &i)) < 0)
 119                 goto fail;
 120
 121         if (i && unit_vtable[t]->no_instances)
 122                 goto fail;
 123
 124         /* Ensure that this unit is either instanced or not instanced,
 125          * but not both. */
 126         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 127                 r = -EINVAL;
 128                 goto fail;
 129         }
 130
 131         if (unit_vtable[t]->no_alias &&
 132             !set_isempty(u->meta.names) &&
 133             !set_get(u->meta.names, s)) {
 134                 r = -EEXIST;
 135                 goto fail;
 136         }
 137
 138         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 139                 r = -E2BIG;
 140                 goto fail;
 141         }
 142
 143         if ((r = set_put(u->meta.names, s)) < 0) {
 144                 if (r == -EEXIST)
 145                         r = 0;
 146                 goto fail;
 147         }
 148
 149         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 150                 set_remove(u->meta.names, s);
 151                 goto fail;
 152         }
 153
 154         if (u->meta.type == _UNIT_TYPE_INVALID) {
 155
 156                 u->meta.type = t;
 157                 u->meta.id = s;
 158                 u->meta.instance = i;
 159
 160                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 161
 162                 if (UNIT_VTABLE(u)->init)
 163                         UNIT_VTABLE(u)->init(u);
 164         } else
 165                 free(i);
 166
 167         unit_add_to_dbus_queue(u);
 168         return 0;
 169
 170 fail:
 171         free(s);
 172         free(i);
 173
 174         return r;
 175 }
 176
 177 int unit_choose_id(Unit *u, const char *name) {
 178         char *s, *t = NULL, *i;
 179         int r;
 180
 181         assert(u);
 182         assert(name);
 183
 184         if (unit_name_is_template(name)) {
 185
 186                 if (!u->meta.instance)
 187                         return -EINVAL;
 188
 189                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 190                         return -ENOMEM;
 191
 192                 name = t;
 193         }
 194
 195         /* Selects one of the names of this unit as the id */
 196         s = set_get(u->meta.names, (char*) name);
 197         free(t);
 198
 199         if (!s)
 200                 return -ENOENT;
 201
 202         if ((r = unit_name_to_instance(s, &i)) < 0)
 203                 return r;
 204
 205         u->meta.id = s;
 206
 207         free(u->meta.instance);
 208         u->meta.instance = i;
 209
 210         unit_add_to_dbus_queue(u);
 211
 212         return 0;
 213 }
 214
 215 int unit_set_description(Unit *u, const char *description) {
 216         char *s;
 217
 218         assert(u);
 219
 220         if (!(s = strdup(description)))
 221                 return -ENOMEM;
 222
 223         free(u->meta.description);
 224         u->meta.description = s;
 225
 226         unit_add_to_dbus_queue(u);
 227         return 0;
 228 }
 229
 230 bool unit_check_gc(Unit *u) {
 231         assert(u);
 232
 233         if (u->meta.load_state == UNIT_STUB)
 234                 return true;
 235
 236         if (UNIT_VTABLE(u)->no_gc)
 237                 return true;
 238
 239         if (u->meta.no_gc)
 240                 return true;
 241
 242         if (u->meta.job)
 243                 return true;
 244
 245         if (unit_active_state(u) != UNIT_INACTIVE)
 246                 return true;
 247
 248         if (UNIT_VTABLE(u)->check_gc)
 249                 if (UNIT_VTABLE(u)->check_gc(u))
 250                         return true;
 251
 252         return false;
 253 }
 254
 255 void unit_add_to_load_queue(Unit *u) {
 256         assert(u);
 257         assert(u->meta.type != _UNIT_TYPE_INVALID);
 258
 259         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 260                 return;
 261
 262         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 263         u->meta.in_load_queue = true;
 264 }
 265
 266 void unit_add_to_cleanup_queue(Unit *u) {
 267         assert(u);
 268
 269         if (u->meta.in_cleanup_queue)
 270                 return;
 271
 272         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 273         u->meta.in_cleanup_queue = true;
 274 }
 275
 276 void unit_add_to_gc_queue(Unit *u) {
 277         assert(u);
 278
 279         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 280                 return;
 281
 282         if (unit_check_gc(u))
 283                 return;
 284
 285         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 286         u->meta.in_gc_queue = true;
 287
 288         u->meta.manager->n_in_gc_queue ++;
 289
 290         if (u->meta.manager->gc_queue_timestamp <= 0)
 291                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 292 }
 293
 294 void unit_add_to_dbus_queue(Unit *u) {
 295         assert(u);
 296         assert(u->meta.type != _UNIT_TYPE_INVALID);
 297
 298         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 299                 return;
 300
 301         /* Shortcut things if nobody cares */
 302         if (!bus_has_subscriber(u->meta.manager)) {
 303                 u->meta.sent_dbus_new_signal = true;
 304                 return;
 305         }
 306
 307         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 308         u->meta.in_dbus_queue = true;
 309 }
 310
 311 static void bidi_set_free(Unit *u, Set *s) {
 312         Iterator i;
 313         Unit *other;
 314
 315         assert(u);
 316
 317         /* Frees the set and makes sure we are dropped from the
 318          * inverse pointers */
 319
 320         SET_FOREACH(other, s, i) {
 321                 UnitDependency d;
 322
 323                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 324                         set_remove(other->meta.dependencies[d], u);
 325
 326                 unit_add_to_gc_queue(other);
 327         }
 328
 329         set_free(s);
 330 }
 331
 332 void unit_free(Unit *u) {
 333         UnitDependency d;
 334         Iterator i;
 335         char *t;
 336
 337         assert(u);
 338
 339         bus_unit_send_removed_signal(u);
 340
 341         if (u->meta.load_state != UNIT_STUB)
 342                 if (UNIT_VTABLE(u)->done)
 343                         UNIT_VTABLE(u)->done(u);
 344
 345         SET_FOREACH(t, u->meta.names, i)
 346                 hashmap_remove_value(u->meta.manager->units, t, u);
 347
 348         if (u->meta.job)
 349                 job_free(u->meta.job);
 350
 351         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 352                 bidi_set_free(u, u->meta.dependencies[d]);
 353
 354         if (u->meta.type != _UNIT_TYPE_INVALID)
 355                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 356
 357         if (u->meta.in_load_queue)
 358                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 359
 360         if (u->meta.in_dbus_queue)
 361                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 362
 363         if (u->meta.in_cleanup_queue)
 364                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 365
 366         if (u->meta.in_gc_queue) {
 367                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 368                 u->meta.manager->n_in_gc_queue--;
 369         }
 370
 371         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 372
 373         free(u->meta.description);
 374         free(u->meta.fragment_path);
 375
 376         set_free_free(u->meta.names);
 377
 378         free(u->meta.instance);
 379
 380         free(u);
 381 }
 382
 383 UnitActiveState unit_active_state(Unit *u) {
 384         assert(u);
 385
 386         if (u->meta.load_state == UNIT_MERGED)
 387                 return unit_active_state(unit_follow_merge(u));
 388
 389         /* After a reload it might happen that a unit is not correctly
 390          * loaded but still has a process around. That's why we won't
 391          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 392
 393         return UNIT_VTABLE(u)->active_state(u);
 394 }
 395
 396 const char* unit_sub_state_to_string(Unit *u) {
 397         assert(u);
 398
 399         return UNIT_VTABLE(u)->sub_state_to_string(u);
 400 }
 401
 402 static void complete_move(Set **s, Set **other) {
 403         assert(s);
 404         assert(other);
 405
 406         if (!*other)
 407                 return;
 408
 409         if (*s)
 410                 set_move(*s, *other);
 411         else {
 412                 *s = *other;
 413                 *other = NULL;
 414         }
 415 }
 416
 417 static void merge_names(Unit *u, Unit *other) {
 418         char *t;
 419         Iterator i;
 420
 421         assert(u);
 422         assert(other);
 423
 424         complete_move(&u->meta.names, &other->meta.names);
 425
 426         set_free_free(other->meta.names);
 427         other->meta.names = NULL;
 428         other->meta.id = NULL;
 429
 430         SET_FOREACH(t, u->meta.names, i)
 431                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 432 }
 433
 434 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 435         Iterator i;
 436         Unit *back;
 437         int r;
 438
 439         assert(u);
 440         assert(other);
 441         assert(d < _UNIT_DEPENDENCY_MAX);
 442
 443         /* Fix backwards pointers */
 444         SET_FOREACH(back, other->meta.dependencies[d], i) {
 445                 UnitDependency k;
 446
 447                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 448                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 449
 450                                 if (r == -EEXIST)
 451                                         set_remove(back->meta.dependencies[k], other);
 452                                 else
 453                                         assert(r == -ENOENT);
 454                         }
 455         }
 456
 457         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 458
 459         set_free(other->meta.dependencies[d]);
 460         other->meta.dependencies[d] = NULL;
 461 }
 462
 463 int unit_merge(Unit *u, Unit *other) {
 464         UnitDependency d;
 465
 466         assert(u);
 467         assert(other);
 468         assert(u->meta.manager == other->meta.manager);
 469         assert(u->meta.type != _UNIT_TYPE_INVALID);
 470
 471         other = unit_follow_merge(other);
 472
 473         if (other == u)
 474                 return 0;
 475
 476         if (u->meta.type != other->meta.type)
 477                 return -EINVAL;
 478
 479         if (!u->meta.instance != !other->meta.instance)
 480                 return -EINVAL;
 481
 482         if (other->meta.load_state != UNIT_STUB &&
 483             other->meta.load_state != UNIT_ERROR)
 484                 return -EEXIST;
 485
 486         if (other->meta.job)
 487                 return -EEXIST;
 488
 489         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 490                 return -EEXIST;
 491
 492         /* Merge names */
 493         merge_names(u, other);
 494
 495         /* Merge dependencies */
 496         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 497                 merge_dependencies(u, other, d);
 498
 499         other->meta.load_state = UNIT_MERGED;
 500         other->meta.merged_into = u;
 501
 502         /* If there is still some data attached to the other node, we
 503          * don't need it anymore, and can free it. */
 504         if (other->meta.load_state != UNIT_STUB)
 505                 if (UNIT_VTABLE(other)->done)
 506                         UNIT_VTABLE(other)->done(other);
 507
 508         unit_add_to_dbus_queue(u);
 509         unit_add_to_cleanup_queue(other);
 510
 511         return 0;
 512 }
 513
 514 int unit_merge_by_name(Unit *u, const char *name) {
 515         Unit *other;
 516         int r;
 517         char *s = NULL;
 518
 519         assert(u);
 520         assert(name);
 521
 522         if (unit_name_is_template(name)) {
 523                 if (!u->meta.instance)
 524                         return -EINVAL;
 525
 526                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 527                         return -ENOMEM;
 528
 529                 name = s;
 530         }
 531
 532         if (!(other = manager_get_unit(u->meta.manager, name)))
 533                 r = unit_add_name(u, name);
 534         else
 535                 r = unit_merge(u, other);
 536
 537         free(s);
 538         return r;
 539 }
 540
 541 Unit* unit_follow_merge(Unit *u) {
 542         assert(u);
 543
 544         while (u->meta.load_state == UNIT_MERGED)
 545                 assert_se(u = u->meta.merged_into);
 546
 547         return u;
 548 }
 549
 550 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 551         int r;
 552
 553         assert(u);
 554         assert(c);
 555
 556         if (c->std_output != EXEC_OUTPUT_KMSG &&
 557             c->std_output != EXEC_OUTPUT_SYSLOG &&
 558             c->std_error != EXEC_OUTPUT_KMSG &&
 559             c->std_error != EXEC_OUTPUT_SYSLOG)
 560                 return 0;
 561
 562         /* If syslog or kernel logging is requested, make sure our own
 563          * logging daemon is run first. */
 564
 565         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 566                 return r;
 567
 568         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 569                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 570                         return r;
 571
 572         return 0;
 573 }
 574
 575 const char *unit_description(Unit *u) {
 576         assert(u);
 577
 578         if (u->meta.description)
 579                 return u->meta.description;
 580
 581         return u->meta.id;
 582 }
 583
 584 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 585         char *t;
 586         UnitDependency d;
 587         Iterator i;
 588         char *p2;
 589         const char *prefix2;
 590         CGroupBonding *b;
 591         char
 592                 timestamp1[FORMAT_TIMESTAMP_MAX],
 593                 timestamp2[FORMAT_TIMESTAMP_MAX],
 594                 timestamp3[FORMAT_TIMESTAMP_MAX],
 595                 timestamp4[FORMAT_TIMESTAMP_MAX],
 596                 timespan[FORMAT_TIMESPAN_MAX];
 597         Unit *following;
 598
 599         assert(u);
 600         assert(u->meta.type >= 0);
 601
 602         if (!prefix)
 603                 prefix = "";
 604         p2 = strappend(prefix, "\t");
 605         prefix2 = p2 ? p2 : prefix;
 606
 607         fprintf(f,
 608                 "%s-> Unit %s:\n"
 609                 "%s\tDescription: %s\n"
 610                 "%s\tInstance: %s\n"
 611                 "%s\tUnit Load State: %s\n"
 612                 "%s\tUnit Active State: %s\n"
 613                 "%s\tInactive Exit Timestamp: %s\n"
 614                 "%s\tActive Enter Timestamp: %s\n"
 615                 "%s\tActive Exit Timestamp: %s\n"
 616                 "%s\tInactive Enter Timestamp: %s\n"
 617                 "%s\tGC Check Good: %s\n"
 618                 "%s\tNeed Daemon Reload: %s\n",
 619                 prefix, u->meta.id,
 620                 prefix, unit_description(u),
 621                 prefix, strna(u->meta.instance),
 622                 prefix, unit_load_state_to_string(u->meta.load_state),
 623                 prefix, unit_active_state_to_string(unit_active_state(u)),
 624                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 625                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 626                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 627                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 628                 prefix, yes_no(unit_check_gc(u)),
 629                 prefix, yes_no(unit_need_daemon_reload(u)));
 630
 631         SET_FOREACH(t, u->meta.names, i)
 632                 fprintf(f, "%s\tName: %s\n", prefix, t);
 633
 634         if ((following = unit_following(u)))
 635                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 636
 637         if (u->meta.fragment_path)
 638                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 639
 640         if (u->meta.job_timeout > 0)
 641                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 642
 643         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 644                 Unit *other;
 645
 646                 SET_FOREACH(other, u->meta.dependencies[d], i)
 647                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 648         }
 649
 650         if (u->meta.load_state == UNIT_LOADED) {
 651                 fprintf(f,
 652                         "%s\tRecursive Stop: %s\n"
 653                         "%s\tStopWhenUnneeded: %s\n"
 654                         "%s\tRefuseManualStart: %s\n"
 655                         "%s\tRefuseManualStop: %s\n"
 656                         "%s\tDefaultDependencies: %s\n"
 657                         "%s\tIgnoreDependencyFailure: %s\n",
 658                         prefix, yes_no(u->meta.recursive_stop),
 659                         prefix, yes_no(u->meta.stop_when_unneeded),
 660                         prefix, yes_no(u->meta.refuse_manual_start),
 661                         prefix, yes_no(u->meta.refuse_manual_stop),
 662                         prefix, yes_no(u->meta.default_dependencies),
 663                         prefix, yes_no(u->meta.ignore_dependency_failure));
 664
 665                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 666                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 667                                 prefix, b->controller, b->path);
 668
 669                 if (UNIT_VTABLE(u)->dump)
 670                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 671
 672         } else if (u->meta.load_state == UNIT_MERGED)
 673                 fprintf(f,
 674                         "%s\tMerged into: %s\n",
 675                         prefix, u->meta.merged_into->meta.id);
 676         else if (u->meta.load_state == UNIT_ERROR)
 677                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 678
 679
 680         if (u->meta.job)
 681                 job_dump(u->meta.job, f, prefix2);
 682
 683         free(p2);
 684 }
 685
 686 /* Common implementation for multiple backends */
 687 int unit_load_fragment_and_dropin(Unit *u) {
 688         int r;
 689
 690         assert(u);
 691
 692         /* Load a .service file */
 693         if ((r = unit_load_fragment(u)) < 0)
 694                 return r;
 695
 696         if (u->meta.load_state == UNIT_STUB)
 697                 return -ENOENT;
 698
 699         /* Load drop-in directory data */
 700         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 701                 return r;
 702
 703         return 0;
 704 }
 705
 706 /* Common implementation for multiple backends */
 707 int unit_load_fragment_and_dropin_optional(Unit *u) {
 708         int r;
 709
 710         assert(u);
 711
 712         /* Same as unit_load_fragment_and_dropin(), but whether
 713          * something can be loaded or not doesn't matter. */
 714
 715         /* Load a .service file */
 716         if ((r = unit_load_fragment(u)) < 0)
 717                 return r;
 718
 719         if (u->meta.load_state == UNIT_STUB)
 720                 u->meta.load_state = UNIT_LOADED;
 721
 722         /* Load drop-in directory data */
 723         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 724                 return r;
 725
 726         return 0;
 727 }
 728
 729 static int unit_add_one_default_dependency(Unit *u, Unit *target) {
 730         assert(u);
 731         assert(target);
 732
 733         if (target->meta.type != UNIT_TARGET)
 734                 return 0;
 735
 736         /* Don't create loops */
 737         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 738                 return 0;
 739
 740         return unit_add_dependency(target, UNIT_AFTER, u, true);
 741 }
 742
 743 static int unit_add_default_dependencies(Unit *u) {
 744         Unit *other;
 745         Iterator i;
 746         int r;
 747
 748         assert(u);
 749
 750         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 751                 if ((r = unit_add_one_default_dependency(u, other)) < 0)
 752                         return r;
 753
 754         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 755                 if ((r = unit_add_one_default_dependency(u, other)) < 0)
 756                         return r;
 757
 758         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 759                 if ((r = unit_add_one_default_dependency(u, other)) < 0)
 760                         return r;
 761
 762         return 0;
 763 }
 764
 765 int unit_load(Unit *u) {
 766         int r;
 767
 768         assert(u);
 769
 770         if (u->meta.in_load_queue) {
 771                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 772                 u->meta.in_load_queue = false;
 773         }
 774
 775         if (u->meta.type == _UNIT_TYPE_INVALID)
 776                 return -EINVAL;
 777
 778         if (u->meta.load_state != UNIT_STUB)
 779                 return 0;
 780
 781         if (UNIT_VTABLE(u)->load)
 782                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 783                         goto fail;
 784
 785         if (u->meta.load_state == UNIT_STUB) {
 786                 r = -ENOENT;
 787                 goto fail;
 788         }
 789
 790         if (u->meta.load_state == UNIT_LOADED &&
 791             u->meta.default_dependencies)
 792                 if ((r = unit_add_default_dependencies(u)) < 0)
 793                         goto fail;
 794
 795         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 796
 797         unit_add_to_dbus_queue(unit_follow_merge(u));
 798         unit_add_to_gc_queue(u);
 799
 800         return 0;
 801
 802 fail:
 803         u->meta.load_state = UNIT_ERROR;
 804         u->meta.load_error = r;
 805         unit_add_to_dbus_queue(u);
 806
 807         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 808
 809         return r;
 810 }
 811
 812 /* Errors:
 813  *         -EBADR:     This unit type does not support starting.
 814  *         -EALREADY:  Unit is already started.
 815  *         -EAGAIN:    An operation is already in progress. Retry later.
 816  *         -ECANCELED: Too many requests for now.
 817  */
 818 int unit_start(Unit *u) {
 819         UnitActiveState state;
 820
 821         assert(u);
 822
 823         if (u->meta.load_state != UNIT_LOADED)
 824                 return -EINVAL;
 825
 826         /* If this is already (being) started, then this will
 827          * succeed. Note that this will even succeed if this unit is
 828          * not startable by the user. This is relied on to detect when
 829          * we need to wait for units and when waiting is finished. */
 830         state = unit_active_state(u);
 831         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 832                 return -EALREADY;
 833
 834         /* If it is stopped, but we cannot start it, then fail */
 835         if (!UNIT_VTABLE(u)->start)
 836                 return -EBADR;
 837
 838         /* We don't suppress calls to ->start() here when we are
 839          * already starting, to allow this request to be used as a
 840          * "hurry up" call, for example when the unit is in some "auto
 841          * restart" state where it waits for a holdoff timer to elapse
 842          * before it will start again. */
 843
 844         unit_add_to_dbus_queue(u);
 845
 846         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 847
 848         return UNIT_VTABLE(u)->start(u);
 849 }
 850
 851 bool unit_can_start(Unit *u) {
 852         assert(u);
 853
 854         return !!UNIT_VTABLE(u)->start;
 855 }
 856
 857 bool unit_can_isolate(Unit *u) {
 858         assert(u);
 859
 860         return unit_can_start(u) &&
 861                 u->meta.allow_isolate;
 862 }
 863
 864 /* Errors:
 865  *         -EBADR:    This unit type does not support stopping.
 866  *         -EALREADY: Unit is already stopped.
 867  *         -EAGAIN:   An operation is already in progress. Retry later.
 868  */
 869 int unit_stop(Unit *u) {
 870         UnitActiveState state;
 871
 872         assert(u);
 873
 874         state = unit_active_state(u);
 875         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 876                 return -EALREADY;
 877
 878         if (!UNIT_VTABLE(u)->stop)
 879                 return -EBADR;
 880
 881         unit_add_to_dbus_queue(u);
 882
 883         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 884
 885         return UNIT_VTABLE(u)->stop(u);
 886 }
 887
 888 /* Errors:
 889  *         -EBADR:    This unit type does not support reloading.
 890  *         -ENOEXEC:  Unit is not started.
 891  *         -EAGAIN:   An operation is already in progress. Retry later.
 892  */
 893 int unit_reload(Unit *u) {
 894         UnitActiveState state;
 895
 896         assert(u);
 897
 898         if (u->meta.load_state != UNIT_LOADED)
 899                 return -EINVAL;
 900
 901         if (!unit_can_reload(u))
 902                 return -EBADR;
 903
 904         state = unit_active_state(u);
 905         if (state == UNIT_RELOADING)
 906                 return -EALREADY;
 907
 908         if (state != UNIT_ACTIVE)
 909                 return -ENOEXEC;
 910
 911         unit_add_to_dbus_queue(u);
 912         return UNIT_VTABLE(u)->reload(u);
 913 }
 914
 915 bool unit_can_reload(Unit *u) {
 916         assert(u);
 917
 918         if (!UNIT_VTABLE(u)->reload)
 919                 return false;
 920
 921         if (!UNIT_VTABLE(u)->can_reload)
 922                 return true;
 923
 924         return UNIT_VTABLE(u)->can_reload(u);
 925 }
 926
 927 static void unit_check_uneeded(Unit *u) {
 928         Iterator i;
 929         Unit *other;
 930
 931         assert(u);
 932
 933         /* If this service shall be shut down when unneeded then do
 934          * so. */
 935
 936         if (!u->meta.stop_when_unneeded)
 937                 return;
 938
 939         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 940                 return;
 941
 942         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 943                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 944                         return;
 945
 946         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 947                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 948                         return;
 949
 950         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 951                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 952                         return;
 953
 954         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 955
 956         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 957         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 958 }
 959
 960 static void retroactively_start_dependencies(Unit *u) {
 961         Iterator i;
 962         Unit *other;
 963
 964         assert(u);
 965         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 966
 967         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 968                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 969                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 970
 971         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 972                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 973                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 974
 975         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 976                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 977                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 978
 979         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 980                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 981                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 982
 983         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 984                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 985                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 986
 987         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 988                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 989                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 990 }
 991
 992 static void retroactively_stop_dependencies(Unit *u) {
 993         Iterator i;
 994         Unit *other;
 995
 996         assert(u);
 997         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 998
 999         if (u->meta.recursive_stop) {
1000                 /* Pull down units need us recursively if enabled */
1001                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1002                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1003                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1004         }
1005
1006         /* Garbage collect services that might not be needed anymore, if enabled */
1007         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1008                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1009                         unit_check_uneeded(other);
1010         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1011                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1012                         unit_check_uneeded(other);
1013         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1014                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1015                         unit_check_uneeded(other);
1016         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1017                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018                         unit_check_uneeded(other);
1019         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1020                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1021                         unit_check_uneeded(other);
1022 }
1023
1024 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1025         dual_timestamp ts;
1026         bool unexpected;
1027
1028         assert(u);
1029         assert(os < _UNIT_ACTIVE_STATE_MAX);
1030         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1031
1032         /* Note that this is called for all low-level state changes,
1033          * even if they might map to the same high-level
1034          * UnitActiveState! That means that ns == os is OK an expected
1035          * behaviour here. For example: if a mount point is remounted
1036          * this function will be called too! */
1037
1038         dual_timestamp_get(&ts);
1039
1040         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1041                 u->meta.inactive_exit_timestamp = ts;
1042         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1043                 u->meta.inactive_enter_timestamp = ts;
1044
1045         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1046                 u->meta.active_enter_timestamp = ts;
1047         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1048                 u->meta.active_exit_timestamp = ts;
1049
1050         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1051                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1052
1053         timer_unit_notify(u, ns);
1054         path_unit_notify(u, ns);
1055
1056         if (u->meta.job) {
1057                 unexpected = false;
1058
1059                 if (u->meta.job->state == JOB_WAITING)
1060
1061                         /* So we reached a different state for this
1062                          * job. Let's see if we can run it now if it
1063                          * failed previously due to EAGAIN. */
1064                         job_add_to_run_queue(u->meta.job);
1065
1066                 /* Let's check whether this state change constitutes a
1067                  * finished job, or maybe cotradicts a running job and
1068                  * hence needs to invalidate jobs. */
1069
1070                 switch (u->meta.job->type) {
1071
1072                 case JOB_START:
1073                 case JOB_VERIFY_ACTIVE:
1074
1075                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1076                                 job_finish_and_invalidate(u->meta.job, true);
1077                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1078                                 unexpected = true;
1079
1080                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1081                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1082                         }
1083
1084                         break;
1085
1086                 case JOB_RELOAD:
1087                 case JOB_RELOAD_OR_START:
1088
1089                         if (u->meta.job->state == JOB_RUNNING) {
1090                                 if (ns == UNIT_ACTIVE)
1091                                         job_finish_and_invalidate(u->meta.job, true);
1092                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1093                                         unexpected = true;
1094
1095                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1096                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1097                                 }
1098                         }
1099
1100                         break;
1101
1102                 case JOB_STOP:
1103                 case JOB_RESTART:
1104                 case JOB_TRY_RESTART:
1105
1106                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1107                                 job_finish_and_invalidate(u->meta.job, true);
1108                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1109                                 unexpected = true;
1110                                 job_finish_and_invalidate(u->meta.job, false);
1111                         }
1112
1113                         break;
1114
1115                 default:
1116                         assert_not_reached("Job type unknown");
1117                 }
1118
1119         } else
1120                 unexpected = true;
1121
1122         /* If this state change happened without being requested by a
1123          * job, then let's retroactively start or stop
1124          * dependencies. We skip that step when deserializing, since
1125          * we don't want to create any additional jobs just because
1126          * something is already activated. */
1127
1128         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1129                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1130                         retroactively_start_dependencies(u);
1131                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1132                         retroactively_stop_dependencies(u);
1133         }
1134
1135         if (ns != os && ns == UNIT_FAILED) {
1136                 Iterator i;
1137                 Unit *other;
1138
1139                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1140                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1141
1142                 log_notice("Unit %s entered failed state.", u->meta.id);
1143         }
1144
1145         /* Some names are special */
1146         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1147                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1148                         /* The bus just might have become available,
1149                          * hence try to connect to it, if we aren't
1150                          * yet connected. */
1151                         bus_init(u->meta.manager);
1152
1153                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1154                         /* The syslog daemon just might have become
1155                          * available, hence try to connect to it, if
1156                          * we aren't yet connected. */
1157                         log_open();
1158
1159                 if (u->meta.type == UNIT_SERVICE &&
1160                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1161                         /* Write audit record if we have just finished starting up */
1162                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1163                         u->meta.in_audit = true;
1164                 }
1165
1166         } else {
1167
1168                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1169                         /* The syslog daemon might just have
1170                          * terminated, hence try to disconnect from
1171                          * it. */
1172                         log_close_syslog();
1173
1174                 /* We don't care about D-Bus here, since we'll get an
1175                  * asynchronous notification for it anyway. */
1176
1177                 if (u->meta.type == UNIT_SERVICE &&
1178                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1179                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1180
1181                         /* Hmm, if there was no start record written
1182                          * write it now, so that we always have a nice
1183                          * pair */
1184                         if (!u->meta.in_audit) {
1185                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1186
1187                                 if (ns == UNIT_INACTIVE)
1188                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1189                         } else
1190                                 /* Write audit record if we have just finished shutting down */
1191                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1192
1193                         u->meta.in_audit = false;
1194                 }
1195         }
1196
1197         /* Maybe we finished startup and are now ready for being
1198          * stopped because unneeded? */
1199         unit_check_uneeded(u);
1200
1201         unit_add_to_dbus_queue(u);
1202         unit_add_to_gc_queue(u);
1203 }
1204
1205 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1206         struct epoll_event ev;
1207
1208         assert(u);
1209         assert(fd >= 0);
1210         assert(w);
1211         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1212
1213         zero(ev);
1214         ev.data.ptr = w;
1215         ev.events = events;
1216
1217         if (epoll_ctl(u->meta.manager->epoll_fd,
1218                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1219                       fd,
1220                       &ev) < 0)
1221                 return -errno;
1222
1223         w->fd = fd;
1224         w->type = WATCH_FD;
1225         w->data.unit = u;
1226
1227         return 0;
1228 }
1229
1230 void unit_unwatch_fd(Unit *u, Watch *w) {
1231         assert(u);
1232         assert(w);
1233
1234         if (w->type == WATCH_INVALID)
1235                 return;
1236
1237         assert(w->type == WATCH_FD);
1238         assert(w->data.unit == u);
1239         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1240
1241         w->fd = -1;
1242         w->type = WATCH_INVALID;
1243         w->data.unit = NULL;
1244 }
1245
1246 int unit_watch_pid(Unit *u, pid_t pid) {
1247         assert(u);
1248         assert(pid >= 1);
1249
1250         /* Watch a specific PID. We only support one unit watching
1251          * each PID for now. */
1252
1253         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1254 }
1255
1256 void unit_unwatch_pid(Unit *u, pid_t pid) {
1257         assert(u);
1258         assert(pid >= 1);
1259
1260         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1261 }
1262
1263 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1264         struct itimerspec its;
1265         int flags, fd;
1266         bool ours;
1267
1268         assert(u);
1269         assert(w);
1270         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1271
1272         /* This will try to reuse the old timer if there is one */
1273
1274         if (w->type == WATCH_UNIT_TIMER) {
1275                 assert(w->data.unit == u);
1276                 assert(w->fd >= 0);
1277
1278                 ours = false;
1279                 fd = w->fd;
1280         } else if (w->type == WATCH_INVALID) {
1281
1282                 ours = true;
1283                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1284                         return -errno;
1285         } else
1286                 assert_not_reached("Invalid watch type");
1287
1288         zero(its);
1289
1290         if (delay <= 0) {
1291                 /* Set absolute time in the past, but not 0, since we
1292                  * don't want to disarm the timer */
1293                 its.it_value.tv_sec = 0;
1294                 its.it_value.tv_nsec = 1;
1295
1296                 flags = TFD_TIMER_ABSTIME;
1297         } else {
1298                 timespec_store(&its.it_value, delay);
1299                 flags = 0;
1300         }
1301
1302         /* This will also flush the elapse counter */
1303         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1304                 goto fail;
1305
1306         if (w->type == WATCH_INVALID) {
1307                 struct epoll_event ev;
1308
1309                 zero(ev);
1310                 ev.data.ptr = w;
1311                 ev.events = EPOLLIN;
1312
1313                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1314                         goto fail;
1315         }
1316
1317         w->type = WATCH_UNIT_TIMER;
1318         w->fd = fd;
1319         w->data.unit = u;
1320
1321         return 0;
1322
1323 fail:
1324         if (ours)
1325                 close_nointr_nofail(fd);
1326
1327         return -errno;
1328 }
1329
1330 void unit_unwatch_timer(Unit *u, Watch *w) {
1331         assert(u);
1332         assert(w);
1333
1334         if (w->type == WATCH_INVALID)
1335                 return;
1336
1337         assert(w->type == WATCH_UNIT_TIMER);
1338         assert(w->data.unit == u);
1339         assert(w->fd >= 0);
1340
1341         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1342         close_nointr_nofail(w->fd);
1343
1344         w->fd = -1;
1345         w->type = WATCH_INVALID;
1346         w->data.unit = NULL;
1347 }
1348
1349 bool unit_job_is_applicable(Unit *u, JobType j) {
1350         assert(u);
1351         assert(j >= 0 && j < _JOB_TYPE_MAX);
1352
1353         switch (j) {
1354
1355         case JOB_VERIFY_ACTIVE:
1356         case JOB_START:
1357                 return true;
1358
1359         case JOB_STOP:
1360         case JOB_RESTART:
1361         case JOB_TRY_RESTART:
1362                 return unit_can_start(u);
1363
1364         case JOB_RELOAD:
1365                 return unit_can_reload(u);
1366
1367         case JOB_RELOAD_OR_START:
1368                 return unit_can_reload(u) && unit_can_start(u);
1369
1370         default:
1371                 assert_not_reached("Invalid job type");
1372         }
1373 }
1374
1375 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1376
1377         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1378                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1379                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1380                 [UNIT_WANTS] = UNIT_WANTED_BY,
1381                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1382                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1383                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1384                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1385                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1386                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1387                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1388                 [UNIT_BEFORE] = UNIT_AFTER,
1389                 [UNIT_AFTER] = UNIT_BEFORE,
1390                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1391                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1392                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1393         };
1394         int r, q = 0, v = 0, w = 0;
1395
1396         assert(u);
1397         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1398         assert(other);
1399
1400         /* We won't allow dependencies on ourselves. We will not
1401          * consider them an error however. */
1402         if (u == other)
1403                 return 0;
1404
1405         if (UNIT_VTABLE(u)->no_requires &&
1406             (d == UNIT_REQUIRES ||
1407              d == UNIT_REQUIRES_OVERRIDABLE ||
1408              d == UNIT_REQUISITE ||
1409              d == UNIT_REQUISITE_OVERRIDABLE)) {
1410                     return -EINVAL;
1411         }
1412
1413         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1414                 return r;
1415
1416         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1417                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1418                         return r;
1419
1420         if (add_reference)
1421                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1422                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1423                         return r;
1424
1425         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1426                 return q;
1427
1428         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1429                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1430                         r = v;
1431                         goto fail;
1432                 }
1433
1434         if (add_reference) {
1435                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1436                         r = w;
1437                         goto fail;
1438                 }
1439
1440                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1441                         goto fail;
1442         }
1443
1444         unit_add_to_dbus_queue(u);
1445         return 0;
1446
1447 fail:
1448         if (q > 0)
1449                 set_remove(u->meta.dependencies[d], other);
1450
1451         if (v > 0)
1452                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1453
1454         if (w > 0)
1455                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1456
1457         return r;
1458 }
1459
1460 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1461         int r;
1462
1463         assert(u);
1464
1465         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1466                 return r;
1467
1468         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1469                 return r;
1470
1471         return 0;
1472 }
1473
1474 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1475         char *s;
1476
1477         assert(u);
1478         assert(name || path);
1479
1480         if (!name)
1481                 name = file_name_from_path(path);
1482
1483         if (!unit_name_is_template(name)) {
1484                 *p = NULL;
1485                 return name;
1486         }
1487
1488         if (u->meta.instance)
1489                 s = unit_name_replace_instance(name, u->meta.instance);
1490         else {
1491                 char *i;
1492
1493                 if (!(i = unit_name_to_prefix(u->meta.id)))
1494                         return NULL;
1495
1496                 s = unit_name_replace_instance(name, i);
1497                 free(i);
1498         }
1499
1500         if (!s)
1501                 return NULL;
1502
1503         *p = s;
1504         return s;
1505 }
1506
1507 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1508         Unit *other;
1509         int r;
1510         char *s;
1511
1512         assert(u);
1513         assert(name || path);
1514
1515         if (!(name = resolve_template(u, name, path, &s)))
1516                 return -ENOMEM;
1517
1518         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1519                 goto finish;
1520
1521         r = unit_add_dependency(u, d, other, add_reference);
1522
1523 finish:
1524         free(s);
1525         return r;
1526 }
1527
1528 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1529         Unit *other;
1530         int r;
1531         char *s;
1532
1533         assert(u);
1534         assert(name || path);
1535
1536         if (!(name = resolve_template(u, name, path, &s)))
1537                 return -ENOMEM;
1538
1539         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1540                 goto finish;
1541
1542         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1543
1544 finish:
1545         free(s);
1546         return r;
1547 }
1548
1549 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1550         Unit *other;
1551         int r;
1552         char *s;
1553
1554         assert(u);
1555         assert(name || path);
1556
1557         if (!(name = resolve_template(u, name, path, &s)))
1558                 return -ENOMEM;
1559
1560         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1561                 goto finish;
1562
1563         r = unit_add_dependency(other, d, u, add_reference);
1564
1565 finish:
1566         free(s);
1567         return r;
1568 }
1569
1570 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1571         Unit *other;
1572         int r;
1573         char *s;
1574
1575         assert(u);
1576         assert(name || path);
1577
1578         if (!(name = resolve_template(u, name, path, &s)))
1579                 return -ENOMEM;
1580
1581         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1582                 goto finish;
1583
1584         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1585                 goto finish;
1586
1587 finish:
1588         free(s);
1589         return r;
1590 }
1591
1592 int set_unit_path(const char *p) {
1593         char *cwd, *c;
1594         int r;
1595
1596         /* This is mostly for debug purposes */
1597
1598         if (path_is_absolute(p)) {
1599                 if (!(c = strdup(p)))
1600                         return -ENOMEM;
1601         } else {
1602                 if (!(cwd = get_current_dir_name()))
1603                         return -errno;
1604
1605                 r = asprintf(&c, "%s/%s", cwd, p);
1606                 free(cwd);
1607
1608                 if (r < 0)
1609                         return -ENOMEM;
1610         }
1611
1612         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1613                 r = -errno;
1614                 free(c);
1615                 return r;
1616         }
1617
1618         return 0;
1619 }
1620
1621 char *unit_dbus_path(Unit *u) {
1622         char *p, *e;
1623
1624         assert(u);
1625
1626         if (!u->meta.id)
1627                 return NULL;
1628
1629         if (!(e = bus_path_escape(u->meta.id)))
1630                 return NULL;
1631
1632         p = strappend("/org/freedesktop/systemd1/unit/", e);
1633         free(e);
1634
1635         return p;
1636 }
1637
1638 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1639         CGroupBonding *l;
1640         int r;
1641
1642         assert(u);
1643         assert(b);
1644
1645         assert(b->path);
1646
1647         if (!b->controller)
1648                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1649                         return -ENOMEM;
1650
1651         /* Ensure this hasn't been added yet */
1652         assert(!b->unit);
1653
1654         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1655         LIST_PREPEND(CGroupBonding, by_path, l, b);
1656
1657         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1658                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1659                 return r;
1660         }
1661
1662         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1663         b->unit = u;
1664
1665         return 0;
1666 }
1667
1668 static char *default_cgroup_path(Unit *u) {
1669         char *p;
1670         int r;
1671
1672         assert(u);
1673
1674         if (u->meta.instance) {
1675                 char *t;
1676
1677                 if (!(t = unit_name_template(u->meta.id)))
1678                         return NULL;
1679
1680                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1681                 free(t);
1682         } else
1683                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1684
1685         return r < 0 ? NULL : p;
1686 }
1687
1688 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1689         char *controller = NULL, *path = NULL;
1690         CGroupBonding *b = NULL;
1691         int r;
1692
1693         assert(u);
1694         assert(name);
1695
1696         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1697                 return r;
1698
1699         if (!path)
1700                 path = default_cgroup_path(u);
1701
1702         if (!controller)
1703                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1704
1705         if (!path || !controller) {
1706                 free(path);
1707                 free(controller);
1708
1709                 return -ENOMEM;
1710         }
1711
1712         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1713                 r = -EEXIST;
1714                 goto fail;
1715         }
1716
1717         if (!(b = new0(CGroupBonding, 1))) {
1718                 r = -ENOMEM;
1719                 goto fail;
1720         }
1721
1722         b->controller = controller;
1723         b->path = path;
1724         b->only_us = false;
1725         b->clean_up = false;
1726
1727         if ((r = unit_add_cgroup(u, b)) < 0)
1728                 goto fail;
1729
1730         return 0;
1731
1732 fail:
1733         free(path);
1734         free(controller);
1735         free(b);
1736
1737         return r;
1738 }
1739
1740 int unit_add_default_cgroup(Unit *u) {
1741         CGroupBonding *b;
1742         int r = -ENOMEM;
1743
1744         assert(u);
1745
1746         /* Adds in the default cgroup data, if it wasn't specified yet */
1747
1748         if (unit_get_default_cgroup(u))
1749                 return 0;
1750
1751         if (!(b = new0(CGroupBonding, 1)))
1752                 return -ENOMEM;
1753
1754         if (!(b->path = default_cgroup_path(u)))
1755                 goto fail;
1756
1757         b->clean_up = true;
1758         b->only_us = true;
1759
1760         if ((r = unit_add_cgroup(u, b)) < 0)
1761                 goto fail;
1762
1763         return 0;
1764
1765 fail:
1766         free(b->path);
1767         free(b->controller);
1768         free(b);
1769
1770         return r;
1771 }
1772
1773 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1774         assert(u);
1775
1776         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1777 }
1778
1779 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1780         char *t;
1781         int r;
1782
1783         assert(u);
1784         assert(type);
1785         assert(_found);
1786
1787         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1788                 return -ENOMEM;
1789
1790         assert(!unit_has_name(u, t));
1791
1792         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1793         free(t);
1794
1795         assert(r < 0 || *_found != u);
1796
1797         return r;
1798 }
1799
1800 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1801         Unit *found;
1802         char *t;
1803
1804         assert(u);
1805         assert(type);
1806         assert(_found);
1807
1808         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1809                 return -ENOMEM;
1810
1811         assert(!unit_has_name(u, t));
1812
1813         found = manager_get_unit(u->meta.manager, t);
1814         free(t);
1815
1816         if (!found)
1817                 return -ENOENT;
1818
1819         *_found = found;
1820         return 0;
1821 }
1822
1823 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1824         Unit *u = userdata;
1825         assert(u);
1826
1827         return unit_name_to_prefix_and_instance(u->meta.id);
1828 }
1829
1830 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1831         Unit *u = userdata;
1832         assert(u);
1833
1834         return unit_name_to_prefix(u->meta.id);
1835 }
1836
1837 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1838         Unit *u = userdata;
1839         char *p, *r;
1840
1841         assert(u);
1842
1843         if (!(p = unit_name_to_prefix(u->meta.id)))
1844                 return NULL;
1845
1846         r = unit_name_unescape(p);
1847         free(p);
1848
1849         return r;
1850 }
1851
1852 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1853         Unit *u = userdata;
1854         assert(u);
1855
1856         if (u->meta.instance)
1857                 return unit_name_unescape(u->meta.instance);
1858
1859         return strdup("");
1860 }
1861
1862 char *unit_name_printf(Unit *u, const char* format) {
1863
1864         /*
1865          * This will use the passed string as format string and
1866          * replace the following specifiers:
1867          *
1868          * %n: the full id of the unit                 (foo@bar.waldo)
1869          * %N: the id of the unit without the suffix   (foo@bar)
1870          * %p: the prefix                              (foo)
1871          * %i: the instance                            (bar)
1872          */
1873
1874         const Specifier table[] = {
1875                 { 'n', specifier_string,              u->meta.id },
1876                 { 'N', specifier_prefix_and_instance, NULL },
1877                 { 'p', specifier_prefix,              NULL },
1878                 { 'i', specifier_string,              u->meta.instance },
1879                 { 0, NULL, NULL }
1880         };
1881
1882         assert(u);
1883         assert(format);
1884
1885         return specifier_printf(format, table, u);
1886 }
1887
1888 char *unit_full_printf(Unit *u, const char *format) {
1889
1890         /* This is similar to unit_name_printf() but also supports
1891          * unescaping */
1892
1893         const Specifier table[] = {
1894                 { 'n', specifier_string,              u->meta.id },
1895                 { 'N', specifier_prefix_and_instance, NULL },
1896                 { 'p', specifier_prefix,              NULL },
1897                 { 'P', specifier_prefix_unescaped,    NULL },
1898                 { 'i', specifier_string,              u->meta.instance },
1899                 { 'I', specifier_instance_unescaped,  NULL },
1900                 { 0, NULL, NULL }
1901         };
1902
1903         assert(u);
1904         assert(format);
1905
1906         return specifier_printf(format, table, u);
1907 }
1908
1909 char **unit_full_printf_strv(Unit *u, char **l) {
1910         size_t n;
1911         char **r, **i, **j;
1912
1913         /* Applies unit_full_printf to every entry in l */
1914
1915         assert(u);
1916
1917         n = strv_length(l);
1918         if (!(r = new(char*, n+1)))
1919                 return NULL;
1920
1921         for (i = l, j = r; *i; i++, j++)
1922                 if (!(*j = unit_full_printf(u, *i)))
1923                         goto fail;
1924
1925         *j = NULL;
1926         return r;
1927
1928 fail:
1929         j--;
1930         while (j >= r)
1931                 free(*j);
1932
1933         free(r);
1934
1935         return NULL;
1936 }
1937
1938 int unit_watch_bus_name(Unit *u, const char *name) {
1939         assert(u);
1940         assert(name);
1941
1942         /* Watch a specific name on the bus. We only support one unit
1943          * watching each name for now. */
1944
1945         return hashmap_put(u->meta.manager->watch_bus, name, u);
1946 }
1947
1948 void unit_unwatch_bus_name(Unit *u, const char *name) {
1949         assert(u);
1950         assert(name);
1951
1952         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1953 }
1954
1955 bool unit_can_serialize(Unit *u) {
1956         assert(u);
1957
1958         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1959 }
1960
1961 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1962         int r;
1963
1964         assert(u);
1965         assert(f);
1966         assert(fds);
1967
1968         if (!unit_can_serialize(u))
1969                 return 0;
1970
1971         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1972                 return r;
1973
1974         if (u->meta.job)
1975                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1976
1977         /* End marker */
1978         fputc('\n', f);
1979         return 0;
1980 }
1981
1982 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1983         va_list ap;
1984
1985         assert(u);
1986         assert(f);
1987         assert(key);
1988         assert(format);
1989
1990         fputs(key, f);
1991         fputc('=', f);
1992
1993         va_start(ap, format);
1994         vfprintf(f, format, ap);
1995         va_end(ap);
1996
1997         fputc('\n', f);
1998 }
1999
2000 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2001         assert(u);
2002         assert(f);
2003         assert(key);
2004         assert(value);
2005
2006         fprintf(f, "%s=%s\n", key, value);
2007 }
2008
2009 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2010         int r;
2011
2012         assert(u);
2013         assert(f);
2014         assert(fds);
2015
2016         if (!unit_can_serialize(u))
2017                 return 0;
2018
2019         for (;;) {
2020                 char line[1024], *l, *v;
2021                 size_t k;
2022
2023                 if (!fgets(line, sizeof(line), f)) {
2024                         if (feof(f))
2025                                 return 0;
2026                         return -errno;
2027                 }
2028
2029                 char_array_0(line);
2030                 l = strstrip(line);
2031
2032                 /* End marker */
2033                 if (l[0] == 0)
2034                         return 0;
2035
2036                 k = strcspn(l, "=");
2037
2038                 if (l[k] == '=') {
2039                         l[k] = 0;
2040                         v = l+k+1;
2041                 } else
2042                         v = l+k;
2043
2044                 if (streq(l, "job")) {
2045                         JobType type;
2046
2047                         if ((type = job_type_from_string(v)) < 0)
2048                                 log_debug("Failed to parse job type value %s", v);
2049                         else
2050                                 u->meta.deserialized_job = type;
2051
2052                         continue;
2053                 }
2054
2055                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2056                         return r;
2057         }
2058 }
2059
2060 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2061         Unit *device;
2062         char *e;
2063         int r;
2064
2065         assert(u);
2066
2067         if (!what)
2068                 return 0;
2069
2070         /* Adds in links to the device node that this unit is based on */
2071
2072         if (!is_device_path(what))
2073                 return 0;
2074
2075         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2076                 return -ENOMEM;
2077
2078         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2079         free(e);
2080
2081         if (r < 0)
2082                 return r;
2083
2084         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2085                 return r;
2086
2087         if (wants)
2088                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2089                         return r;
2090
2091         return 0;
2092 }
2093
2094 int unit_coldplug(Unit *u) {
2095         int r;
2096
2097         assert(u);
2098
2099         if (UNIT_VTABLE(u)->coldplug)
2100                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2101                         return r;
2102
2103         if (u->meta.deserialized_job >= 0) {
2104                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2105                         return r;
2106
2107                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2108         }
2109
2110         return 0;
2111 }
2112
2113 void unit_status_printf(Unit *u, const char *format, ...) {
2114         va_list ap;
2115
2116         assert(u);
2117         assert(format);
2118
2119         if (!UNIT_VTABLE(u)->show_status)
2120                 return;
2121
2122         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2123                 return;
2124
2125         if (!u->meta.manager->show_status)
2126                 return;
2127
2128         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2129                 return;
2130
2131         va_start(ap, format);
2132         status_vprintf(format, ap);
2133         va_end(ap);
2134 }
2135
2136 bool unit_need_daemon_reload(Unit *u) {
2137         struct stat st;
2138
2139         assert(u);
2140
2141         if (!u->meta.fragment_path)
2142                 return false;
2143
2144         zero(st);
2145         if (stat(u->meta.fragment_path, &st) < 0)
2146                 /* What, cannot access this anymore? */
2147                 return true;
2148
2149         return
2150                 u->meta.fragment_mtime &&
2151                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2152 }
2153
2154 void unit_reset_failed(Unit *u) {
2155         assert(u);
2156
2157         if (UNIT_VTABLE(u)->reset_failed)
2158                 UNIT_VTABLE(u)->reset_failed(u);
2159 }
2160
2161 Unit *unit_following(Unit *u) {
2162         assert(u);
2163
2164         if (UNIT_VTABLE(u)->following)
2165                 return UNIT_VTABLE(u)->following(u);
2166
2167         return NULL;
2168 }
2169
2170 bool unit_pending_inactive(Unit *u) {
2171         assert(u);
2172
2173         /* Returns true if the unit is inactive or going down */
2174
2175         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2176                 return true;
2177
2178         if (u->meta.job && u->meta.job->type == JOB_STOP)
2179                 return true;
2180
2181         return false;
2182 }
2183
2184 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2185         [UNIT_STUB] = "stub",
2186         [UNIT_LOADED] = "loaded",
2187         [UNIT_ERROR] = "error",
2188         [UNIT_MERGED] = "merged"
2189 };
2190
2191 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2192
2193 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2194         [UNIT_ACTIVE] = "active",
2195         [UNIT_RELOADING] = "reloading",
2196         [UNIT_INACTIVE] = "inactive",
2197         [UNIT_FAILED] = "failed",
2198         [UNIT_ACTIVATING] = "activating",
2199         [UNIT_DEACTIVATING] = "deactivating"
2200 };
2201
2202 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2203
2204 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2205         [UNIT_REQUIRES] = "Requires",
2206         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2207         [UNIT_WANTS] = "Wants",
2208         [UNIT_REQUISITE] = "Requisite",
2209         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2210         [UNIT_REQUIRED_BY] = "RequiredBy",
2211         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2212         [UNIT_WANTED_BY] = "WantedBy",
2213         [UNIT_CONFLICTS] = "Conflicts",
2214         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2215         [UNIT_BEFORE] = "Before",
2216         [UNIT_AFTER] = "After",
2217         [UNIT_REFERENCES] = "References",
2218         [UNIT_REFERENCED_BY] = "ReferencedBy",
2219         [UNIT_ON_FAILURE] = "OnFailure"
2220 };
2221
2222 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2223
2224 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2225         [KILL_CONTROL_GROUP] = "control-group",
2226         [KILL_PROCESS_GROUP] = "process-group",
2227         [KILL_PROCESS] = "process",
2228         [KILL_NONE] = "none"
2229 };
2230
2231 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);