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 strna(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 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 730         assert(u);
 731         assert(target);
 732
 733         if (target->meta.type != UNIT_TARGET)
 734                 return 0;
 735
 736         /* Only add the dependency if boths units are loaded, so that
 737          * that loop check below is reliable */
 738         if (u->meta.load_state != UNIT_LOADED ||
 739             target->meta.load_state != UNIT_LOADED)
 740                 return 0;
 741
 742         /* Don't create loops */
 743         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 744                 return 0;
 745
 746         return unit_add_dependency(target, UNIT_AFTER, u, true);
 747 }
 748
 749 static int unit_add_default_dependencies(Unit *u) {
 750         Unit *target;
 751         Iterator i;
 752         int r;
 753
 754         assert(u);
 755
 756         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 757                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 758                         return r;
 759
 760         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 761                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 762                         return r;
 763
 764         SET_FOREACH(target, u->meta.dependencies[UNIT_WANTED_BY], i)
 765                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 766                         return r;
 767
 768         return 0;
 769 }
 770
 771 int unit_load(Unit *u) {
 772         int r;
 773
 774         assert(u);
 775
 776         if (u->meta.in_load_queue) {
 777                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 778                 u->meta.in_load_queue = false;
 779         }
 780
 781         if (u->meta.type == _UNIT_TYPE_INVALID)
 782                 return -EINVAL;
 783
 784         if (u->meta.load_state != UNIT_STUB)
 785                 return 0;
 786
 787         if (UNIT_VTABLE(u)->load)
 788                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 789                         goto fail;
 790
 791         if (u->meta.load_state == UNIT_STUB) {
 792                 r = -ENOENT;
 793                 goto fail;
 794         }
 795
 796         if (u->meta.load_state == UNIT_LOADED &&
 797             u->meta.default_dependencies)
 798                 if ((r = unit_add_default_dependencies(u)) < 0)
 799                         goto fail;
 800
 801         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 802
 803         unit_add_to_dbus_queue(unit_follow_merge(u));
 804         unit_add_to_gc_queue(u);
 805
 806         return 0;
 807
 808 fail:
 809         u->meta.load_state = UNIT_ERROR;
 810         u->meta.load_error = r;
 811         unit_add_to_dbus_queue(u);
 812
 813         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 814
 815         return r;
 816 }
 817
 818 /* Errors:
 819  *         -EBADR:     This unit type does not support starting.
 820  *         -EALREADY:  Unit is already started.
 821  *         -EAGAIN:    An operation is already in progress. Retry later.
 822  *         -ECANCELED: Too many requests for now.
 823  */
 824 int unit_start(Unit *u) {
 825         UnitActiveState state;
 826
 827         assert(u);
 828
 829         if (u->meta.load_state != UNIT_LOADED)
 830                 return -EINVAL;
 831
 832         /* If this is already (being) started, then this will
 833          * succeed. Note that this will even succeed if this unit is
 834          * not startable by the user. This is relied on to detect when
 835          * we need to wait for units and when waiting is finished. */
 836         state = unit_active_state(u);
 837         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 838                 return -EALREADY;
 839
 840         /* If it is stopped, but we cannot start it, then fail */
 841         if (!UNIT_VTABLE(u)->start)
 842                 return -EBADR;
 843
 844         /* We don't suppress calls to ->start() here when we are
 845          * already starting, to allow this request to be used as a
 846          * "hurry up" call, for example when the unit is in some "auto
 847          * restart" state where it waits for a holdoff timer to elapse
 848          * before it will start again. */
 849
 850         unit_add_to_dbus_queue(u);
 851
 852         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 853
 854         return UNIT_VTABLE(u)->start(u);
 855 }
 856
 857 bool unit_can_start(Unit *u) {
 858         assert(u);
 859
 860         return !!UNIT_VTABLE(u)->start;
 861 }
 862
 863 bool unit_can_isolate(Unit *u) {
 864         assert(u);
 865
 866         return unit_can_start(u) &&
 867                 u->meta.allow_isolate;
 868 }
 869
 870 /* Errors:
 871  *         -EBADR:    This unit type does not support stopping.
 872  *         -EALREADY: Unit is already stopped.
 873  *         -EAGAIN:   An operation is already in progress. Retry later.
 874  */
 875 int unit_stop(Unit *u) {
 876         UnitActiveState state;
 877
 878         assert(u);
 879
 880         state = unit_active_state(u);
 881         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 882                 return -EALREADY;
 883
 884         if (!UNIT_VTABLE(u)->stop)
 885                 return -EBADR;
 886
 887         unit_add_to_dbus_queue(u);
 888
 889         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 890
 891         return UNIT_VTABLE(u)->stop(u);
 892 }
 893
 894 /* Errors:
 895  *         -EBADR:    This unit type does not support reloading.
 896  *         -ENOEXEC:  Unit is not started.
 897  *         -EAGAIN:   An operation is already in progress. Retry later.
 898  */
 899 int unit_reload(Unit *u) {
 900         UnitActiveState state;
 901
 902         assert(u);
 903
 904         if (u->meta.load_state != UNIT_LOADED)
 905                 return -EINVAL;
 906
 907         if (!unit_can_reload(u))
 908                 return -EBADR;
 909
 910         state = unit_active_state(u);
 911         if (state == UNIT_RELOADING)
 912                 return -EALREADY;
 913
 914         if (state != UNIT_ACTIVE)
 915                 return -ENOEXEC;
 916
 917         unit_add_to_dbus_queue(u);
 918         return UNIT_VTABLE(u)->reload(u);
 919 }
 920
 921 bool unit_can_reload(Unit *u) {
 922         assert(u);
 923
 924         if (!UNIT_VTABLE(u)->reload)
 925                 return false;
 926
 927         if (!UNIT_VTABLE(u)->can_reload)
 928                 return true;
 929
 930         return UNIT_VTABLE(u)->can_reload(u);
 931 }
 932
 933 static void unit_check_unneeded(Unit *u) {
 934         Iterator i;
 935         Unit *other;
 936
 937         assert(u);
 938
 939         /* If this service shall be shut down when unneeded then do
 940          * so. */
 941
 942         if (!u->meta.stop_when_unneeded)
 943                 return;
 944
 945         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 946                 return;
 947
 948         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 949                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 950                         return;
 951
 952         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 953                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 954                         return;
 955
 956         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 957                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 958                         return;
 959
 960         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 961
 962         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 963         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 964 }
 965
 966 static void retroactively_start_dependencies(Unit *u) {
 967         Iterator i;
 968         Unit *other;
 969
 970         assert(u);
 971         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 972
 973         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 974                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 975                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 976
 977         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 978                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 979                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 980
 981         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 982                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 983                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 984
 985         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 986                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 987                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 988
 989         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 990                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 991                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 992
 993         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 994                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 995                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 996 }
 997
 998 static void retroactively_stop_dependencies(Unit *u) {
 999         Iterator i;
1000         Unit *other;
1001
1002         assert(u);
1003         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1004
1005         if (u->meta.recursive_stop) {
1006                 /* Pull down units need us recursively if enabled */
1007                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1008                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1009                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1010         }
1011
1012         /* Garbage collect services that might not be needed anymore, if enabled */
1013         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1014                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1015                         unit_check_unneeded(other);
1016         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1017                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018                         unit_check_unneeded(other);
1019         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1020                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1021                         unit_check_unneeded(other);
1022         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1023                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1024                         unit_check_unneeded(other);
1025         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1026                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1027                         unit_check_unneeded(other);
1028 }
1029
1030 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1031         dual_timestamp ts;
1032         bool unexpected;
1033
1034         assert(u);
1035         assert(os < _UNIT_ACTIVE_STATE_MAX);
1036         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1037
1038         /* Note that this is called for all low-level state changes,
1039          * even if they might map to the same high-level
1040          * UnitActiveState! That means that ns == os is OK an expected
1041          * behaviour here. For example: if a mount point is remounted
1042          * this function will be called too! */
1043
1044         dual_timestamp_get(&ts);
1045
1046         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1047                 u->meta.inactive_exit_timestamp = ts;
1048         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1049                 u->meta.inactive_enter_timestamp = ts;
1050
1051         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1052                 u->meta.active_enter_timestamp = ts;
1053         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1054                 u->meta.active_exit_timestamp = ts;
1055
1056         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1057                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1058
1059         timer_unit_notify(u, ns);
1060         path_unit_notify(u, ns);
1061
1062         if (u->meta.job) {
1063                 unexpected = false;
1064
1065                 if (u->meta.job->state == JOB_WAITING)
1066
1067                         /* So we reached a different state for this
1068                          * job. Let's see if we can run it now if it
1069                          * failed previously due to EAGAIN. */
1070                         job_add_to_run_queue(u->meta.job);
1071
1072                 /* Let's check whether this state change constitutes a
1073                  * finished job, or maybe cotradicts a running job and
1074                  * hence needs to invalidate jobs. */
1075
1076                 switch (u->meta.job->type) {
1077
1078                 case JOB_START:
1079                 case JOB_VERIFY_ACTIVE:
1080
1081                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1082                                 job_finish_and_invalidate(u->meta.job, true);
1083                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1084                                 unexpected = true;
1085
1086                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1087                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1088                         }
1089
1090                         break;
1091
1092                 case JOB_RELOAD:
1093                 case JOB_RELOAD_OR_START:
1094
1095                         if (u->meta.job->state == JOB_RUNNING) {
1096                                 if (ns == UNIT_ACTIVE)
1097                                         job_finish_and_invalidate(u->meta.job, true);
1098                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1099                                         unexpected = true;
1100
1101                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1102                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1103                                 }
1104                         }
1105
1106                         break;
1107
1108                 case JOB_STOP:
1109                 case JOB_RESTART:
1110                 case JOB_TRY_RESTART:
1111
1112                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1113                                 job_finish_and_invalidate(u->meta.job, true);
1114                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1115                                 unexpected = true;
1116                                 job_finish_and_invalidate(u->meta.job, false);
1117                         }
1118
1119                         break;
1120
1121                 default:
1122                         assert_not_reached("Job type unknown");
1123                 }
1124
1125         } else
1126                 unexpected = true;
1127
1128         /* If this state change happened without being requested by a
1129          * job, then let's retroactively start or stop
1130          * dependencies. We skip that step when deserializing, since
1131          * we don't want to create any additional jobs just because
1132          * something is already activated. */
1133
1134         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1135                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1136                         retroactively_start_dependencies(u);
1137                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1138                         retroactively_stop_dependencies(u);
1139         }
1140
1141         if (ns != os && ns == UNIT_FAILED) {
1142                 Iterator i;
1143                 Unit *other;
1144
1145                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1146                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1147
1148                 log_notice("Unit %s entered failed state.", u->meta.id);
1149         }
1150
1151         /* Some names are special */
1152         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1153                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1154                         /* The bus just might have become available,
1155                          * hence try to connect to it, if we aren't
1156                          * yet connected. */
1157                         bus_init(u->meta.manager);
1158
1159                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1160                         /* The syslog daemon just might have become
1161                          * available, hence try to connect to it, if
1162                          * we aren't yet connected. */
1163                         log_open();
1164
1165                 if (u->meta.type == UNIT_SERVICE &&
1166                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1167                         /* Write audit record if we have just finished starting up */
1168                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, 1);
1169                         u->meta.in_audit = true;
1170                 }
1171
1172         } else {
1173
1174                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1175                         /* The syslog daemon might just have
1176                          * terminated, hence try to disconnect from
1177                          * it. */
1178                         log_close_syslog();
1179
1180                 /* We don't care about D-Bus here, since we'll get an
1181                  * asynchronous notification for it anyway. */
1182
1183                 if (u->meta.type == UNIT_SERVICE &&
1184                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1185                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1186
1187                         /* Hmm, if there was no start record written
1188                          * write it now, so that we always have a nice
1189                          * pair */
1190                         if (!u->meta.in_audit) {
1191                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1192
1193                                 if (ns == UNIT_INACTIVE)
1194                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1195                         } else
1196                                 /* Write audit record if we have just finished shutting down */
1197                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1198
1199                         u->meta.in_audit = false;
1200                 }
1201         }
1202
1203         /* Maybe we finished startup and are now ready for being
1204          * stopped because unneeded? */
1205         unit_check_unneeded(u);
1206
1207         unit_add_to_dbus_queue(u);
1208         unit_add_to_gc_queue(u);
1209 }
1210
1211 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1212         struct epoll_event ev;
1213
1214         assert(u);
1215         assert(fd >= 0);
1216         assert(w);
1217         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1218
1219         zero(ev);
1220         ev.data.ptr = w;
1221         ev.events = events;
1222
1223         if (epoll_ctl(u->meta.manager->epoll_fd,
1224                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1225                       fd,
1226                       &ev) < 0)
1227                 return -errno;
1228
1229         w->fd = fd;
1230         w->type = WATCH_FD;
1231         w->data.unit = u;
1232
1233         return 0;
1234 }
1235
1236 void unit_unwatch_fd(Unit *u, Watch *w) {
1237         assert(u);
1238         assert(w);
1239
1240         if (w->type == WATCH_INVALID)
1241                 return;
1242
1243         assert(w->type == WATCH_FD);
1244         assert(w->data.unit == u);
1245         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1246
1247         w->fd = -1;
1248         w->type = WATCH_INVALID;
1249         w->data.unit = NULL;
1250 }
1251
1252 int unit_watch_pid(Unit *u, pid_t pid) {
1253         assert(u);
1254         assert(pid >= 1);
1255
1256         /* Watch a specific PID. We only support one unit watching
1257          * each PID for now. */
1258
1259         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1260 }
1261
1262 void unit_unwatch_pid(Unit *u, pid_t pid) {
1263         assert(u);
1264         assert(pid >= 1);
1265
1266         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1267 }
1268
1269 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1270         struct itimerspec its;
1271         int flags, fd;
1272         bool ours;
1273
1274         assert(u);
1275         assert(w);
1276         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1277
1278         /* This will try to reuse the old timer if there is one */
1279
1280         if (w->type == WATCH_UNIT_TIMER) {
1281                 assert(w->data.unit == u);
1282                 assert(w->fd >= 0);
1283
1284                 ours = false;
1285                 fd = w->fd;
1286         } else if (w->type == WATCH_INVALID) {
1287
1288                 ours = true;
1289                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1290                         return -errno;
1291         } else
1292                 assert_not_reached("Invalid watch type");
1293
1294         zero(its);
1295
1296         if (delay <= 0) {
1297                 /* Set absolute time in the past, but not 0, since we
1298                  * don't want to disarm the timer */
1299                 its.it_value.tv_sec = 0;
1300                 its.it_value.tv_nsec = 1;
1301
1302                 flags = TFD_TIMER_ABSTIME;
1303         } else {
1304                 timespec_store(&its.it_value, delay);
1305                 flags = 0;
1306         }
1307
1308         /* This will also flush the elapse counter */
1309         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1310                 goto fail;
1311
1312         if (w->type == WATCH_INVALID) {
1313                 struct epoll_event ev;
1314
1315                 zero(ev);
1316                 ev.data.ptr = w;
1317                 ev.events = EPOLLIN;
1318
1319                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1320                         goto fail;
1321         }
1322
1323         w->type = WATCH_UNIT_TIMER;
1324         w->fd = fd;
1325         w->data.unit = u;
1326
1327         return 0;
1328
1329 fail:
1330         if (ours)
1331                 close_nointr_nofail(fd);
1332
1333         return -errno;
1334 }
1335
1336 void unit_unwatch_timer(Unit *u, Watch *w) {
1337         assert(u);
1338         assert(w);
1339
1340         if (w->type == WATCH_INVALID)
1341                 return;
1342
1343         assert(w->type == WATCH_UNIT_TIMER);
1344         assert(w->data.unit == u);
1345         assert(w->fd >= 0);
1346
1347         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1348         close_nointr_nofail(w->fd);
1349
1350         w->fd = -1;
1351         w->type = WATCH_INVALID;
1352         w->data.unit = NULL;
1353 }
1354
1355 bool unit_job_is_applicable(Unit *u, JobType j) {
1356         assert(u);
1357         assert(j >= 0 && j < _JOB_TYPE_MAX);
1358
1359         switch (j) {
1360
1361         case JOB_VERIFY_ACTIVE:
1362         case JOB_START:
1363                 return true;
1364
1365         case JOB_STOP:
1366         case JOB_RESTART:
1367         case JOB_TRY_RESTART:
1368                 return unit_can_start(u);
1369
1370         case JOB_RELOAD:
1371                 return unit_can_reload(u);
1372
1373         case JOB_RELOAD_OR_START:
1374                 return unit_can_reload(u) && unit_can_start(u);
1375
1376         default:
1377                 assert_not_reached("Invalid job type");
1378         }
1379 }
1380
1381 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1382
1383         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1384                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1385                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1386                 [UNIT_WANTS] = UNIT_WANTED_BY,
1387                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1388                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1389                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1390                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1391                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1392                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1393                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1394                 [UNIT_BEFORE] = UNIT_AFTER,
1395                 [UNIT_AFTER] = UNIT_BEFORE,
1396                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1397                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1398                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1399         };
1400         int r, q = 0, v = 0, w = 0;
1401
1402         assert(u);
1403         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1404         assert(other);
1405
1406         u = unit_follow_merge(u);
1407         other = unit_follow_merge(other);
1408
1409         /* We won't allow dependencies on ourselves. We will not
1410          * consider them an error however. */
1411         if (u == other)
1412                 return 0;
1413
1414         if (UNIT_VTABLE(u)->no_requires &&
1415             (d == UNIT_REQUIRES ||
1416              d == UNIT_REQUIRES_OVERRIDABLE ||
1417              d == UNIT_REQUISITE ||
1418              d == UNIT_REQUISITE_OVERRIDABLE)) {
1419                     return -EINVAL;
1420         }
1421
1422         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1423                 return r;
1424
1425         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1426                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1427                         return r;
1428
1429         if (add_reference)
1430                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1431                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1432                         return r;
1433
1434         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1435                 return q;
1436
1437         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1438                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1439                         r = v;
1440                         goto fail;
1441                 }
1442
1443         if (add_reference) {
1444                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1445                         r = w;
1446                         goto fail;
1447                 }
1448
1449                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1450                         goto fail;
1451         }
1452
1453         unit_add_to_dbus_queue(u);
1454         return 0;
1455
1456 fail:
1457         if (q > 0)
1458                 set_remove(u->meta.dependencies[d], other);
1459
1460         if (v > 0)
1461                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1462
1463         if (w > 0)
1464                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1465
1466         return r;
1467 }
1468
1469 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1470         int r;
1471
1472         assert(u);
1473
1474         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1475                 return r;
1476
1477         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1478                 return r;
1479
1480         return 0;
1481 }
1482
1483 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1484         char *s;
1485
1486         assert(u);
1487         assert(name || path);
1488
1489         if (!name)
1490                 name = file_name_from_path(path);
1491
1492         if (!unit_name_is_template(name)) {
1493                 *p = NULL;
1494                 return name;
1495         }
1496
1497         if (u->meta.instance)
1498                 s = unit_name_replace_instance(name, u->meta.instance);
1499         else {
1500                 char *i;
1501
1502                 if (!(i = unit_name_to_prefix(u->meta.id)))
1503                         return NULL;
1504
1505                 s = unit_name_replace_instance(name, i);
1506                 free(i);
1507         }
1508
1509         if (!s)
1510                 return NULL;
1511
1512         *p = s;
1513         return s;
1514 }
1515
1516 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1517         Unit *other;
1518         int r;
1519         char *s;
1520
1521         assert(u);
1522         assert(name || path);
1523
1524         if (!(name = resolve_template(u, name, path, &s)))
1525                 return -ENOMEM;
1526
1527         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1528                 goto finish;
1529
1530         r = unit_add_dependency(u, d, other, add_reference);
1531
1532 finish:
1533         free(s);
1534         return r;
1535 }
1536
1537 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1538         Unit *other;
1539         int r;
1540         char *s;
1541
1542         assert(u);
1543         assert(name || path);
1544
1545         if (!(name = resolve_template(u, name, path, &s)))
1546                 return -ENOMEM;
1547
1548         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1549                 goto finish;
1550
1551         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1552
1553 finish:
1554         free(s);
1555         return r;
1556 }
1557
1558 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1559         Unit *other;
1560         int r;
1561         char *s;
1562
1563         assert(u);
1564         assert(name || path);
1565
1566         if (!(name = resolve_template(u, name, path, &s)))
1567                 return -ENOMEM;
1568
1569         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1570                 goto finish;
1571
1572         r = unit_add_dependency(other, d, u, add_reference);
1573
1574 finish:
1575         free(s);
1576         return r;
1577 }
1578
1579 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1580         Unit *other;
1581         int r;
1582         char *s;
1583
1584         assert(u);
1585         assert(name || path);
1586
1587         if (!(name = resolve_template(u, name, path, &s)))
1588                 return -ENOMEM;
1589
1590         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1591                 goto finish;
1592
1593         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1594                 goto finish;
1595
1596 finish:
1597         free(s);
1598         return r;
1599 }
1600
1601 int set_unit_path(const char *p) {
1602         char *cwd, *c;
1603         int r;
1604
1605         /* This is mostly for debug purposes */
1606
1607         if (path_is_absolute(p)) {
1608                 if (!(c = strdup(p)))
1609                         return -ENOMEM;
1610         } else {
1611                 if (!(cwd = get_current_dir_name()))
1612                         return -errno;
1613
1614                 r = asprintf(&c, "%s/%s", cwd, p);
1615                 free(cwd);
1616
1617                 if (r < 0)
1618                         return -ENOMEM;
1619         }
1620
1621         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1622                 r = -errno;
1623                 free(c);
1624                 return r;
1625         }
1626
1627         return 0;
1628 }
1629
1630 char *unit_dbus_path(Unit *u) {
1631         char *p, *e;
1632
1633         assert(u);
1634
1635         if (!u->meta.id)
1636                 return NULL;
1637
1638         if (!(e = bus_path_escape(u->meta.id)))
1639                 return NULL;
1640
1641         p = strappend("/org/freedesktop/systemd1/unit/", e);
1642         free(e);
1643
1644         return p;
1645 }
1646
1647 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1648         CGroupBonding *l;
1649         int r;
1650
1651         assert(u);
1652         assert(b);
1653
1654         assert(b->path);
1655
1656         if (!b->controller)
1657                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1658                         return -ENOMEM;
1659
1660         /* Ensure this hasn't been added yet */
1661         assert(!b->unit);
1662
1663         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1664         LIST_PREPEND(CGroupBonding, by_path, l, b);
1665
1666         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1667                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1668                 return r;
1669         }
1670
1671         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1672         b->unit = u;
1673
1674         return 0;
1675 }
1676
1677 static char *default_cgroup_path(Unit *u) {
1678         char *p;
1679         int r;
1680
1681         assert(u);
1682
1683         if (u->meta.instance) {
1684                 char *t;
1685
1686                 if (!(t = unit_name_template(u->meta.id)))
1687                         return NULL;
1688
1689                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1690                 free(t);
1691         } else
1692                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1693
1694         return r < 0 ? NULL : p;
1695 }
1696
1697 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1698         char *controller = NULL, *path = NULL;
1699         CGroupBonding *b = NULL;
1700         int r;
1701
1702         assert(u);
1703         assert(name);
1704
1705         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1706                 return r;
1707
1708         if (!path)
1709                 path = default_cgroup_path(u);
1710
1711         if (!controller)
1712                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1713
1714         if (!path || !controller) {
1715                 free(path);
1716                 free(controller);
1717
1718                 return -ENOMEM;
1719         }
1720
1721         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1722                 r = -EEXIST;
1723                 goto fail;
1724         }
1725
1726         if (!(b = new0(CGroupBonding, 1))) {
1727                 r = -ENOMEM;
1728                 goto fail;
1729         }
1730
1731         b->controller = controller;
1732         b->path = path;
1733         b->only_us = false;
1734         b->clean_up = false;
1735
1736         if ((r = unit_add_cgroup(u, b)) < 0)
1737                 goto fail;
1738
1739         return 0;
1740
1741 fail:
1742         free(path);
1743         free(controller);
1744         free(b);
1745
1746         return r;
1747 }
1748
1749 int unit_add_default_cgroup(Unit *u) {
1750         CGroupBonding *b;
1751         int r = -ENOMEM;
1752
1753         assert(u);
1754
1755         /* Adds in the default cgroup data, if it wasn't specified yet */
1756
1757         if (unit_get_default_cgroup(u))
1758                 return 0;
1759
1760         if (!(b = new0(CGroupBonding, 1)))
1761                 return -ENOMEM;
1762
1763         if (!(b->path = default_cgroup_path(u)))
1764                 goto fail;
1765
1766         b->clean_up = true;
1767         b->only_us = true;
1768
1769         if ((r = unit_add_cgroup(u, b)) < 0)
1770                 goto fail;
1771
1772         return 0;
1773
1774 fail:
1775         free(b->path);
1776         free(b->controller);
1777         free(b);
1778
1779         return r;
1780 }
1781
1782 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1783         assert(u);
1784
1785         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1786 }
1787
1788 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1789         char *t;
1790         int r;
1791
1792         assert(u);
1793         assert(type);
1794         assert(_found);
1795
1796         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1797                 return -ENOMEM;
1798
1799         assert(!unit_has_name(u, t));
1800
1801         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1802         free(t);
1803
1804         assert(r < 0 || *_found != u);
1805
1806         return r;
1807 }
1808
1809 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1810         Unit *found;
1811         char *t;
1812
1813         assert(u);
1814         assert(type);
1815         assert(_found);
1816
1817         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1818                 return -ENOMEM;
1819
1820         assert(!unit_has_name(u, t));
1821
1822         found = manager_get_unit(u->meta.manager, t);
1823         free(t);
1824
1825         if (!found)
1826                 return -ENOENT;
1827
1828         *_found = found;
1829         return 0;
1830 }
1831
1832 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1833         Unit *u = userdata;
1834         assert(u);
1835
1836         return unit_name_to_prefix_and_instance(u->meta.id);
1837 }
1838
1839 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1840         Unit *u = userdata;
1841         assert(u);
1842
1843         return unit_name_to_prefix(u->meta.id);
1844 }
1845
1846 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1847         Unit *u = userdata;
1848         char *p, *r;
1849
1850         assert(u);
1851
1852         if (!(p = unit_name_to_prefix(u->meta.id)))
1853                 return NULL;
1854
1855         r = unit_name_unescape(p);
1856         free(p);
1857
1858         return r;
1859 }
1860
1861 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1862         Unit *u = userdata;
1863         assert(u);
1864
1865         if (u->meta.instance)
1866                 return unit_name_unescape(u->meta.instance);
1867
1868         return strdup("");
1869 }
1870
1871 char *unit_name_printf(Unit *u, const char* format) {
1872
1873         /*
1874          * This will use the passed string as format string and
1875          * replace the following specifiers:
1876          *
1877          * %n: the full id of the unit                 (foo@bar.waldo)
1878          * %N: the id of the unit without the suffix   (foo@bar)
1879          * %p: the prefix                              (foo)
1880          * %i: the instance                            (bar)
1881          */
1882
1883         const Specifier table[] = {
1884                 { 'n', specifier_string,              u->meta.id },
1885                 { 'N', specifier_prefix_and_instance, NULL },
1886                 { 'p', specifier_prefix,              NULL },
1887                 { 'i', specifier_string,              u->meta.instance },
1888                 { 0, NULL, NULL }
1889         };
1890
1891         assert(u);
1892         assert(format);
1893
1894         return specifier_printf(format, table, u);
1895 }
1896
1897 char *unit_full_printf(Unit *u, const char *format) {
1898
1899         /* This is similar to unit_name_printf() but also supports
1900          * unescaping */
1901
1902         const Specifier table[] = {
1903                 { 'n', specifier_string,              u->meta.id },
1904                 { 'N', specifier_prefix_and_instance, NULL },
1905                 { 'p', specifier_prefix,              NULL },
1906                 { 'P', specifier_prefix_unescaped,    NULL },
1907                 { 'i', specifier_string,              u->meta.instance },
1908                 { 'I', specifier_instance_unescaped,  NULL },
1909                 { 0, NULL, NULL }
1910         };
1911
1912         assert(u);
1913         assert(format);
1914
1915         return specifier_printf(format, table, u);
1916 }
1917
1918 char **unit_full_printf_strv(Unit *u, char **l) {
1919         size_t n;
1920         char **r, **i, **j;
1921
1922         /* Applies unit_full_printf to every entry in l */
1923
1924         assert(u);
1925
1926         n = strv_length(l);
1927         if (!(r = new(char*, n+1)))
1928                 return NULL;
1929
1930         for (i = l, j = r; *i; i++, j++)
1931                 if (!(*j = unit_full_printf(u, *i)))
1932                         goto fail;
1933
1934         *j = NULL;
1935         return r;
1936
1937 fail:
1938         j--;
1939         while (j >= r)
1940                 free(*j);
1941
1942         free(r);
1943
1944         return NULL;
1945 }
1946
1947 int unit_watch_bus_name(Unit *u, const char *name) {
1948         assert(u);
1949         assert(name);
1950
1951         /* Watch a specific name on the bus. We only support one unit
1952          * watching each name for now. */
1953
1954         return hashmap_put(u->meta.manager->watch_bus, name, u);
1955 }
1956
1957 void unit_unwatch_bus_name(Unit *u, const char *name) {
1958         assert(u);
1959         assert(name);
1960
1961         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1962 }
1963
1964 bool unit_can_serialize(Unit *u) {
1965         assert(u);
1966
1967         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1968 }
1969
1970 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1971         int r;
1972
1973         assert(u);
1974         assert(f);
1975         assert(fds);
1976
1977         if (!unit_can_serialize(u))
1978                 return 0;
1979
1980         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1981                 return r;
1982
1983         if (u->meta.job)
1984                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1985
1986         /* End marker */
1987         fputc('\n', f);
1988         return 0;
1989 }
1990
1991 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1992         va_list ap;
1993
1994         assert(u);
1995         assert(f);
1996         assert(key);
1997         assert(format);
1998
1999         fputs(key, f);
2000         fputc('=', f);
2001
2002         va_start(ap, format);
2003         vfprintf(f, format, ap);
2004         va_end(ap);
2005
2006         fputc('\n', f);
2007 }
2008
2009 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2010         assert(u);
2011         assert(f);
2012         assert(key);
2013         assert(value);
2014
2015         fprintf(f, "%s=%s\n", key, value);
2016 }
2017
2018 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2019         int r;
2020
2021         assert(u);
2022         assert(f);
2023         assert(fds);
2024
2025         if (!unit_can_serialize(u))
2026                 return 0;
2027
2028         for (;;) {
2029                 char line[1024], *l, *v;
2030                 size_t k;
2031
2032                 if (!fgets(line, sizeof(line), f)) {
2033                         if (feof(f))
2034                                 return 0;
2035                         return -errno;
2036                 }
2037
2038                 char_array_0(line);
2039                 l = strstrip(line);
2040
2041                 /* End marker */
2042                 if (l[0] == 0)
2043                         return 0;
2044
2045                 k = strcspn(l, "=");
2046
2047                 if (l[k] == '=') {
2048                         l[k] = 0;
2049                         v = l+k+1;
2050                 } else
2051                         v = l+k;
2052
2053                 if (streq(l, "job")) {
2054                         JobType type;
2055
2056                         if ((type = job_type_from_string(v)) < 0)
2057                                 log_debug("Failed to parse job type value %s", v);
2058                         else
2059                                 u->meta.deserialized_job = type;
2060
2061                         continue;
2062                 }
2063
2064                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2065                         return r;
2066         }
2067 }
2068
2069 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2070         Unit *device;
2071         char *e;
2072         int r;
2073
2074         assert(u);
2075
2076         if (!what)
2077                 return 0;
2078
2079         /* Adds in links to the device node that this unit is based on */
2080
2081         if (!is_device_path(what))
2082                 return 0;
2083
2084         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2085                 return -ENOMEM;
2086
2087         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2088         free(e);
2089
2090         if (r < 0)
2091                 return r;
2092
2093         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2094                 return r;
2095
2096         if (wants)
2097                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2098                         return r;
2099
2100         return 0;
2101 }
2102
2103 int unit_coldplug(Unit *u) {
2104         int r;
2105
2106         assert(u);
2107
2108         if (UNIT_VTABLE(u)->coldplug)
2109                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2110                         return r;
2111
2112         if (u->meta.deserialized_job >= 0) {
2113                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2114                         return r;
2115
2116                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2117         }
2118
2119         return 0;
2120 }
2121
2122 void unit_status_printf(Unit *u, const char *format, ...) {
2123         va_list ap;
2124
2125         assert(u);
2126         assert(format);
2127
2128         if (!UNIT_VTABLE(u)->show_status)
2129                 return;
2130
2131         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2132                 return;
2133
2134         if (!u->meta.manager->show_status)
2135                 return;
2136
2137         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2138                 return;
2139
2140         va_start(ap, format);
2141         status_vprintf(format, ap);
2142         va_end(ap);
2143 }
2144
2145 bool unit_need_daemon_reload(Unit *u) {
2146         struct stat st;
2147
2148         assert(u);
2149
2150         if (!u->meta.fragment_path)
2151                 return false;
2152
2153         zero(st);
2154         if (stat(u->meta.fragment_path, &st) < 0)
2155                 /* What, cannot access this anymore? */
2156                 return true;
2157
2158         return
2159                 u->meta.fragment_mtime &&
2160                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2161 }
2162
2163 void unit_reset_failed(Unit *u) {
2164         assert(u);
2165
2166         if (UNIT_VTABLE(u)->reset_failed)
2167                 UNIT_VTABLE(u)->reset_failed(u);
2168 }
2169
2170 Unit *unit_following(Unit *u) {
2171         assert(u);
2172
2173         if (UNIT_VTABLE(u)->following)
2174                 return UNIT_VTABLE(u)->following(u);
2175
2176         return NULL;
2177 }
2178
2179 bool unit_pending_inactive(Unit *u) {
2180         assert(u);
2181
2182         /* Returns true if the unit is inactive or going down */
2183
2184         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2185                 return true;
2186
2187         if (u->meta.job && u->meta.job->type == JOB_STOP)
2188                 return true;
2189
2190         return false;
2191 }
2192
2193 bool unit_pending_active(Unit *u) {
2194         assert(u);
2195
2196         /* Returns true if the unit is inactive or going down */
2197
2198         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2199                 return true;
2200
2201         if (u->meta.job &&
2202             (u->meta.job->type == JOB_START ||
2203              u->meta.job->type == JOB_RELOAD_OR_START ||
2204              u->meta.job->type == JOB_RESTART))
2205                 return true;
2206
2207         return false;
2208 }
2209
2210 UnitType unit_name_to_type(const char *n) {
2211         UnitType t;
2212
2213         assert(n);
2214
2215         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2216                 if (endswith(n, unit_vtable[t]->suffix))
2217                         return t;
2218
2219         return _UNIT_TYPE_INVALID;
2220 }
2221
2222 bool unit_name_is_valid(const char *n) {
2223         UnitType t;
2224
2225         t = unit_name_to_type(n);
2226         if (t < 0 || t >= _UNIT_TYPE_MAX)
2227                 return false;
2228
2229         return unit_name_is_valid_no_type(n);
2230 }
2231
2232 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2233         [UNIT_STUB] = "stub",
2234         [UNIT_LOADED] = "loaded",
2235         [UNIT_ERROR] = "error",
2236         [UNIT_MERGED] = "merged"
2237 };
2238
2239 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2240
2241 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2242         [UNIT_ACTIVE] = "active",
2243         [UNIT_RELOADING] = "reloading",
2244         [UNIT_INACTIVE] = "inactive",
2245         [UNIT_FAILED] = "failed",
2246         [UNIT_ACTIVATING] = "activating",
2247         [UNIT_DEACTIVATING] = "deactivating"
2248 };
2249
2250 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2251
2252 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2253         [UNIT_REQUIRES] = "Requires",
2254         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2255         [UNIT_WANTS] = "Wants",
2256         [UNIT_REQUISITE] = "Requisite",
2257         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2258         [UNIT_REQUIRED_BY] = "RequiredBy",
2259         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2260         [UNIT_WANTED_BY] = "WantedBy",
2261         [UNIT_CONFLICTS] = "Conflicts",
2262         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2263         [UNIT_BEFORE] = "Before",
2264         [UNIT_AFTER] = "After",
2265         [UNIT_REFERENCES] = "References",
2266         [UNIT_REFERENCED_BY] = "ReferencedBy",
2267         [UNIT_ON_FAILURE] = "OnFailure"
2268 };
2269
2270 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2271
2272 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2273         [KILL_CONTROL_GROUP] = "control-group",
2274         [KILL_PROCESS_GROUP] = "process-group",
2275         [KILL_PROCESS] = "process",
2276         [KILL_NONE] = "none"
2277 };
2278
2279 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);