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