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, false)) {
 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         free(u);
 380 }
 381
 382 UnitActiveState unit_active_state(Unit *u) {
 383         assert(u);
 384
 385         if (u->meta.load_state == UNIT_MERGED)
 386                 return unit_active_state(unit_follow_merge(u));
 387
 388         /* After a reload it might happen that a unit is not correctly
 389          * loaded but still has a process around. That's why we won't
 390          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 391
 392         return UNIT_VTABLE(u)->active_state(u);
 393 }
 394
 395 const char* unit_sub_state_to_string(Unit *u) {
 396         assert(u);
 397
 398         return UNIT_VTABLE(u)->sub_state_to_string(u);
 399 }
 400
 401 static void complete_move(Set **s, Set **other) {
 402         assert(s);
 403         assert(other);
 404
 405         if (!*other)
 406                 return;
 407
 408         if (*s)
 409                 set_move(*s, *other);
 410         else {
 411                 *s = *other;
 412                 *other = NULL;
 413         }
 414 }
 415
 416 static void merge_names(Unit *u, Unit *other) {
 417         char *t;
 418         Iterator i;
 419
 420         assert(u);
 421         assert(other);
 422
 423         complete_move(&u->meta.names, &other->meta.names);
 424
 425         set_free_free(other->meta.names);
 426         other->meta.names = NULL;
 427         other->meta.id = NULL;
 428
 429         SET_FOREACH(t, u->meta.names, i)
 430                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 431 }
 432
 433 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 434         Iterator i;
 435         Unit *back;
 436         int r;
 437
 438         assert(u);
 439         assert(other);
 440         assert(d < _UNIT_DEPENDENCY_MAX);
 441
 442         /* Fix backwards pointers */
 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 strna(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 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 729         assert(u);
 730         assert(target);
 731
 732         if (target->meta.type != UNIT_TARGET)
 733                 return 0;
 734
 735         /* Only add the dependency if boths units are loaded, so that
 736          * that loop check below is reliable */
 737         if (u->meta.load_state != UNIT_LOADED ||
 738             target->meta.load_state != UNIT_LOADED)
 739                 return 0;
 740
 741         /* Don't create loops */
 742         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 743                 return 0;
 744
 745         return unit_add_dependency(target, UNIT_AFTER, u, true);
 746 }
 747
 748 static int unit_add_default_dependencies(Unit *u) {
 749         Unit *target;
 750         Iterator i;
 751         int r;
 752
 753         assert(u);
 754
 755         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 756                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 757                         return r;
 758
 759         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 760                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 761                         return r;
 762
 763         SET_FOREACH(target, u->meta.dependencies[UNIT_WANTED_BY], i)
 764                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 765                         return r;
 766
 767         return 0;
 768 }
 769
 770 int unit_load(Unit *u) {
 771         int r;
 772
 773         assert(u);
 774
 775         if (u->meta.in_load_queue) {
 776                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 777                 u->meta.in_load_queue = false;
 778         }
 779
 780         if (u->meta.type == _UNIT_TYPE_INVALID)
 781                 return -EINVAL;
 782
 783         if (u->meta.load_state != UNIT_STUB)
 784                 return 0;
 785
 786         if (UNIT_VTABLE(u)->load)
 787                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 788                         goto fail;
 789
 790         if (u->meta.load_state == UNIT_STUB) {
 791                 r = -ENOENT;
 792                 goto fail;
 793         }
 794
 795         if (u->meta.load_state == UNIT_LOADED &&
 796             u->meta.default_dependencies)
 797                 if ((r = unit_add_default_dependencies(u)) < 0)
 798                         goto fail;
 799
 800         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 801
 802         unit_add_to_dbus_queue(unit_follow_merge(u));
 803         unit_add_to_gc_queue(u);
 804
 805         return 0;
 806
 807 fail:
 808         u->meta.load_state = UNIT_ERROR;
 809         u->meta.load_error = r;
 810         unit_add_to_dbus_queue(u);
 811
 812         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 813
 814         return r;
 815 }
 816
 817 /* Errors:
 818  *         -EBADR:     This unit type does not support starting.
 819  *         -EALREADY:  Unit is already started.
 820  *         -EAGAIN:    An operation is already in progress. Retry later.
 821  *         -ECANCELED: Too many requests for now.
 822  */
 823 int unit_start(Unit *u) {
 824         UnitActiveState state;
 825
 826         assert(u);
 827
 828         if (u->meta.load_state != UNIT_LOADED)
 829                 return -EINVAL;
 830
 831         /* If this is already (being) started, then this will
 832          * succeed. Note that this will even succeed if this unit is
 833          * not startable by the user. This is relied on to detect when
 834          * we need to wait for units and when waiting is finished. */
 835         state = unit_active_state(u);
 836         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 837                 return -EALREADY;
 838
 839         /* If it is stopped, but we cannot start it, then fail */
 840         if (!UNIT_VTABLE(u)->start)
 841                 return -EBADR;
 842
 843         /* We don't suppress calls to ->start() here when we are
 844          * already starting, to allow this request to be used as a
 845          * "hurry up" call, for example when the unit is in some "auto
 846          * restart" state where it waits for a holdoff timer to elapse
 847          * before it will start again. */
 848
 849         unit_add_to_dbus_queue(u);
 850
 851         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 852
 853         return UNIT_VTABLE(u)->start(u);
 854 }
 855
 856 bool unit_can_start(Unit *u) {
 857         assert(u);
 858
 859         return !!UNIT_VTABLE(u)->start;
 860 }
 861
 862 bool unit_can_isolate(Unit *u) {
 863         assert(u);
 864
 865         return unit_can_start(u) &&
 866                 u->meta.allow_isolate;
 867 }
 868
 869 /* Errors:
 870  *         -EBADR:    This unit type does not support stopping.
 871  *         -EALREADY: Unit is already stopped.
 872  *         -EAGAIN:   An operation is already in progress. Retry later.
 873  */
 874 int unit_stop(Unit *u) {
 875         UnitActiveState state;
 876
 877         assert(u);
 878
 879         state = unit_active_state(u);
 880         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 881                 return -EALREADY;
 882
 883         if (!UNIT_VTABLE(u)->stop)
 884                 return -EBADR;
 885
 886         unit_add_to_dbus_queue(u);
 887
 888         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 889
 890         return UNIT_VTABLE(u)->stop(u);
 891 }
 892
 893 /* Errors:
 894  *         -EBADR:    This unit type does not support reloading.
 895  *         -ENOEXEC:  Unit is not started.
 896  *         -EAGAIN:   An operation is already in progress. Retry later.
 897  */
 898 int unit_reload(Unit *u) {
 899         UnitActiveState state;
 900
 901         assert(u);
 902
 903         if (u->meta.load_state != UNIT_LOADED)
 904                 return -EINVAL;
 905
 906         if (!unit_can_reload(u))
 907                 return -EBADR;
 908
 909         state = unit_active_state(u);
 910         if (state == UNIT_RELOADING)
 911                 return -EALREADY;
 912
 913         if (state != UNIT_ACTIVE)
 914                 return -ENOEXEC;
 915
 916         unit_add_to_dbus_queue(u);
 917         return UNIT_VTABLE(u)->reload(u);
 918 }
 919
 920 bool unit_can_reload(Unit *u) {
 921         assert(u);
 922
 923         if (!UNIT_VTABLE(u)->reload)
 924                 return false;
 925
 926         if (!UNIT_VTABLE(u)->can_reload)
 927                 return true;
 928
 929         return UNIT_VTABLE(u)->can_reload(u);
 930 }
 931
 932 static void unit_check_unneeded(Unit *u) {
 933         Iterator i;
 934         Unit *other;
 935
 936         assert(u);
 937
 938         /* If this service shall be shut down when unneeded then do
 939          * so. */
 940
 941         if (!u->meta.stop_when_unneeded)
 942                 return;
 943
 944         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 945                 return;
 946
 947         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 948                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 949                         return;
 950
 951         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 952                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 953                         return;
 954
 955         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 956                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 957                         return;
 958
 959         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 960
 961         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 962         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 963 }
 964
 965 static void retroactively_start_dependencies(Unit *u) {
 966         Iterator i;
 967         Unit *other;
 968
 969         assert(u);
 970         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 971
 972         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 973                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 974                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 975
 976         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 977                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 978                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 979
 980         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 981                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 982                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 983
 984         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 985                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 986                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 987
 988         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 989                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 990                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 991
 992         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
 993                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 994                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
 995 }
 996
 997 static void retroactively_stop_dependencies(Unit *u) {
 998         Iterator i;
 999         Unit *other;
1000
1001         assert(u);
1002         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1003
1004         if (u->meta.recursive_stop) {
1005                 /* Pull down units need us recursively if enabled */
1006                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1007                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1008                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1009         }
1010
1011         /* Garbage collect services that might not be needed anymore, if enabled */
1012         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1013                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1014                         unit_check_unneeded(other);
1015         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1016                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1017                         unit_check_unneeded(other);
1018         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1019                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1020                         unit_check_unneeded(other);
1021         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1022                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1023                         unit_check_unneeded(other);
1024         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1025                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1026                         unit_check_unneeded(other);
1027 }
1028
1029 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1030         dual_timestamp ts;
1031         bool unexpected;
1032
1033         assert(u);
1034         assert(os < _UNIT_ACTIVE_STATE_MAX);
1035         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1036
1037         /* Note that this is called for all low-level state changes,
1038          * even if they might map to the same high-level
1039          * UnitActiveState! That means that ns == os is OK an expected
1040          * behaviour here. For example: if a mount point is remounted
1041          * this function will be called too! */
1042
1043         dual_timestamp_get(&ts);
1044
1045         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1046                 u->meta.inactive_exit_timestamp = ts;
1047         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1048                 u->meta.inactive_enter_timestamp = ts;
1049
1050         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1051                 u->meta.active_enter_timestamp = ts;
1052         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1053                 u->meta.active_exit_timestamp = ts;
1054
1055         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1056                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1057
1058         timer_unit_notify(u, ns);
1059         path_unit_notify(u, ns);
1060
1061         if (u->meta.job) {
1062                 unexpected = false;
1063
1064                 if (u->meta.job->state == JOB_WAITING)
1065
1066                         /* So we reached a different state for this
1067                          * job. Let's see if we can run it now if it
1068                          * failed previously due to EAGAIN. */
1069                         job_add_to_run_queue(u->meta.job);
1070
1071                 /* Let's check whether this state change constitutes a
1072                  * finished job, or maybe cotradicts a running job and
1073                  * hence needs to invalidate jobs. */
1074
1075                 switch (u->meta.job->type) {
1076
1077                 case JOB_START:
1078                 case JOB_VERIFY_ACTIVE:
1079
1080                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1081                                 job_finish_and_invalidate(u->meta.job, true);
1082                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1083                                 unexpected = true;
1084
1085                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1086                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1087                         }
1088
1089                         break;
1090
1091                 case JOB_RELOAD:
1092                 case JOB_RELOAD_OR_START:
1093
1094                         if (u->meta.job->state == JOB_RUNNING) {
1095                                 if (ns == UNIT_ACTIVE)
1096                                         job_finish_and_invalidate(u->meta.job, true);
1097                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1098                                         unexpected = true;
1099
1100                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1101                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1102                                 }
1103                         }
1104
1105                         break;
1106
1107                 case JOB_STOP:
1108                 case JOB_RESTART:
1109                 case JOB_TRY_RESTART:
1110
1111                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1112                                 job_finish_and_invalidate(u->meta.job, true);
1113                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1114                                 unexpected = true;
1115                                 job_finish_and_invalidate(u->meta.job, false);
1116                         }
1117
1118                         break;
1119
1120                 default:
1121                         assert_not_reached("Job type unknown");
1122                 }
1123
1124         } else
1125                 unexpected = true;
1126
1127         /* If this state change happened without being requested by a
1128          * job, then let's retroactively start or stop
1129          * dependencies. We skip that step when deserializing, since
1130          * we don't want to create any additional jobs just because
1131          * something is already activated. */
1132
1133         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1134                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1135                         retroactively_start_dependencies(u);
1136                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1137                         retroactively_stop_dependencies(u);
1138         }
1139
1140         if (ns != os && ns == UNIT_FAILED) {
1141                 Iterator i;
1142                 Unit *other;
1143
1144                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1145                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1146
1147                 log_notice("Unit %s entered failed state.", u->meta.id);
1148         }
1149
1150         /* Some names are special */
1151         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1152                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1153                         /* The bus just might have become available,
1154                          * hence try to connect to it, if we aren't
1155                          * yet connected. */
1156                         bus_init(u->meta.manager);
1157
1158                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1159                         /* The syslog daemon just might have become
1160                          * available, hence try to connect to it, if
1161                          * we aren't yet connected. */
1162                         log_open();
1163
1164                 if (u->meta.type == UNIT_SERVICE &&
1165                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1166                         /* Write audit record if we have just finished starting up */
1167                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1168                         u->meta.in_audit = true;
1169                 }
1170
1171                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1172                         manager_send_unit_plymouth(u->meta.manager, u);
1173
1174         } else {
1175
1176                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1177                         /* The syslog daemon might just have
1178                          * terminated, hence try to disconnect from
1179                          * it. */
1180                         log_close_syslog();
1181
1182                 /* We don't care about D-Bus here, since we'll get an
1183                  * asynchronous notification for it anyway. */
1184
1185                 if (u->meta.type == UNIT_SERVICE &&
1186                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1187                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1188
1189                         /* Hmm, if there was no start record written
1190                          * write it now, so that we always have a nice
1191                          * pair */
1192                         if (!u->meta.in_audit) {
1193                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1194
1195                                 if (ns == UNIT_INACTIVE)
1196                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1197                         } else
1198                                 /* Write audit record if we have just finished shutting down */
1199                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1200
1201                         u->meta.in_audit = false;
1202                 }
1203         }
1204
1205         /* Maybe we finished startup and are now ready for being
1206          * stopped because unneeded? */
1207         unit_check_unneeded(u);
1208
1209         unit_add_to_dbus_queue(u);
1210         unit_add_to_gc_queue(u);
1211 }
1212
1213 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1214         struct epoll_event ev;
1215
1216         assert(u);
1217         assert(fd >= 0);
1218         assert(w);
1219         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1220
1221         zero(ev);
1222         ev.data.ptr = w;
1223         ev.events = events;
1224
1225         if (epoll_ctl(u->meta.manager->epoll_fd,
1226                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1227                       fd,
1228                       &ev) < 0)
1229                 return -errno;
1230
1231         w->fd = fd;
1232         w->type = WATCH_FD;
1233         w->data.unit = u;
1234
1235         return 0;
1236 }
1237
1238 void unit_unwatch_fd(Unit *u, Watch *w) {
1239         assert(u);
1240         assert(w);
1241
1242         if (w->type == WATCH_INVALID)
1243                 return;
1244
1245         assert(w->type == WATCH_FD);
1246         assert(w->data.unit == u);
1247         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1248
1249         w->fd = -1;
1250         w->type = WATCH_INVALID;
1251         w->data.unit = NULL;
1252 }
1253
1254 int unit_watch_pid(Unit *u, pid_t pid) {
1255         assert(u);
1256         assert(pid >= 1);
1257
1258         /* Watch a specific PID. We only support one unit watching
1259          * each PID for now. */
1260
1261         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1262 }
1263
1264 void unit_unwatch_pid(Unit *u, pid_t pid) {
1265         assert(u);
1266         assert(pid >= 1);
1267
1268         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1269 }
1270
1271 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1272         struct itimerspec its;
1273         int flags, fd;
1274         bool ours;
1275
1276         assert(u);
1277         assert(w);
1278         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1279
1280         /* This will try to reuse the old timer if there is one */
1281
1282         if (w->type == WATCH_UNIT_TIMER) {
1283                 assert(w->data.unit == u);
1284                 assert(w->fd >= 0);
1285
1286                 ours = false;
1287                 fd = w->fd;
1288         } else if (w->type == WATCH_INVALID) {
1289
1290                 ours = true;
1291                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1292                         return -errno;
1293         } else
1294                 assert_not_reached("Invalid watch type");
1295
1296         zero(its);
1297
1298         if (delay <= 0) {
1299                 /* Set absolute time in the past, but not 0, since we
1300                  * don't want to disarm the timer */
1301                 its.it_value.tv_sec = 0;
1302                 its.it_value.tv_nsec = 1;
1303
1304                 flags = TFD_TIMER_ABSTIME;
1305         } else {
1306                 timespec_store(&its.it_value, delay);
1307                 flags = 0;
1308         }
1309
1310         /* This will also flush the elapse counter */
1311         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1312                 goto fail;
1313
1314         if (w->type == WATCH_INVALID) {
1315                 struct epoll_event ev;
1316
1317                 zero(ev);
1318                 ev.data.ptr = w;
1319                 ev.events = EPOLLIN;
1320
1321                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1322                         goto fail;
1323         }
1324
1325         w->type = WATCH_UNIT_TIMER;
1326         w->fd = fd;
1327         w->data.unit = u;
1328
1329         return 0;
1330
1331 fail:
1332         if (ours)
1333                 close_nointr_nofail(fd);
1334
1335         return -errno;
1336 }
1337
1338 void unit_unwatch_timer(Unit *u, Watch *w) {
1339         assert(u);
1340         assert(w);
1341
1342         if (w->type == WATCH_INVALID)
1343                 return;
1344
1345         assert(w->type == WATCH_UNIT_TIMER);
1346         assert(w->data.unit == u);
1347         assert(w->fd >= 0);
1348
1349         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1350         close_nointr_nofail(w->fd);
1351
1352         w->fd = -1;
1353         w->type = WATCH_INVALID;
1354         w->data.unit = NULL;
1355 }
1356
1357 bool unit_job_is_applicable(Unit *u, JobType j) {
1358         assert(u);
1359         assert(j >= 0 && j < _JOB_TYPE_MAX);
1360
1361         switch (j) {
1362
1363         case JOB_VERIFY_ACTIVE:
1364         case JOB_START:
1365                 return true;
1366
1367         case JOB_STOP:
1368         case JOB_RESTART:
1369         case JOB_TRY_RESTART:
1370                 return unit_can_start(u);
1371
1372         case JOB_RELOAD:
1373                 return unit_can_reload(u);
1374
1375         case JOB_RELOAD_OR_START:
1376                 return unit_can_reload(u) && unit_can_start(u);
1377
1378         default:
1379                 assert_not_reached("Invalid job type");
1380         }
1381 }
1382
1383 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1384
1385         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1386                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1387                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1388                 [UNIT_WANTS] = UNIT_WANTED_BY,
1389                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1390                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1391                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1392                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1393                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1394                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1395                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1396                 [UNIT_BEFORE] = UNIT_AFTER,
1397                 [UNIT_AFTER] = UNIT_BEFORE,
1398                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1399                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1400                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1401         };
1402         int r, q = 0, v = 0, w = 0;
1403
1404         assert(u);
1405         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1406         assert(other);
1407
1408         u = unit_follow_merge(u);
1409         other = unit_follow_merge(other);
1410
1411         /* We won't allow dependencies on ourselves. We will not
1412          * consider them an error however. */
1413         if (u == other)
1414                 return 0;
1415
1416         if (UNIT_VTABLE(u)->no_requires &&
1417             (d == UNIT_REQUIRES ||
1418              d == UNIT_REQUIRES_OVERRIDABLE ||
1419              d == UNIT_REQUISITE ||
1420              d == UNIT_REQUISITE_OVERRIDABLE)) {
1421                     return -EINVAL;
1422         }
1423
1424         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1425                 return r;
1426
1427         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1428                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1429                         return r;
1430
1431         if (add_reference)
1432                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1433                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1434                         return r;
1435
1436         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1437                 return q;
1438
1439         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1440                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1441                         r = v;
1442                         goto fail;
1443                 }
1444
1445         if (add_reference) {
1446                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1447                         r = w;
1448                         goto fail;
1449                 }
1450
1451                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1452                         goto fail;
1453         }
1454
1455         unit_add_to_dbus_queue(u);
1456         return 0;
1457
1458 fail:
1459         if (q > 0)
1460                 set_remove(u->meta.dependencies[d], other);
1461
1462         if (v > 0)
1463                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1464
1465         if (w > 0)
1466                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1467
1468         return r;
1469 }
1470
1471 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1472         int r;
1473
1474         assert(u);
1475
1476         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1477                 return r;
1478
1479         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1480                 return r;
1481
1482         return 0;
1483 }
1484
1485 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1486         char *s;
1487
1488         assert(u);
1489         assert(name || path);
1490
1491         if (!name)
1492                 name = file_name_from_path(path);
1493
1494         if (!unit_name_is_template(name)) {
1495                 *p = NULL;
1496                 return name;
1497         }
1498
1499         if (u->meta.instance)
1500                 s = unit_name_replace_instance(name, u->meta.instance);
1501         else {
1502                 char *i;
1503
1504                 if (!(i = unit_name_to_prefix(u->meta.id)))
1505                         return NULL;
1506
1507                 s = unit_name_replace_instance(name, i);
1508                 free(i);
1509         }
1510
1511         if (!s)
1512                 return NULL;
1513
1514         *p = s;
1515         return s;
1516 }
1517
1518 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1519         Unit *other;
1520         int r;
1521         char *s;
1522
1523         assert(u);
1524         assert(name || path);
1525
1526         if (!(name = resolve_template(u, name, path, &s)))
1527                 return -ENOMEM;
1528
1529         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1530                 goto finish;
1531
1532         r = unit_add_dependency(u, d, other, add_reference);
1533
1534 finish:
1535         free(s);
1536         return r;
1537 }
1538
1539 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1540         Unit *other;
1541         int r;
1542         char *s;
1543
1544         assert(u);
1545         assert(name || path);
1546
1547         if (!(name = resolve_template(u, name, path, &s)))
1548                 return -ENOMEM;
1549
1550         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1551                 goto finish;
1552
1553         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1554
1555 finish:
1556         free(s);
1557         return r;
1558 }
1559
1560 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1561         Unit *other;
1562         int r;
1563         char *s;
1564
1565         assert(u);
1566         assert(name || path);
1567
1568         if (!(name = resolve_template(u, name, path, &s)))
1569                 return -ENOMEM;
1570
1571         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1572                 goto finish;
1573
1574         r = unit_add_dependency(other, d, u, add_reference);
1575
1576 finish:
1577         free(s);
1578         return r;
1579 }
1580
1581 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1582         Unit *other;
1583         int r;
1584         char *s;
1585
1586         assert(u);
1587         assert(name || path);
1588
1589         if (!(name = resolve_template(u, name, path, &s)))
1590                 return -ENOMEM;
1591
1592         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1593                 goto finish;
1594
1595         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1596                 goto finish;
1597
1598 finish:
1599         free(s);
1600         return r;
1601 }
1602
1603 int set_unit_path(const char *p) {
1604         char *cwd, *c;
1605         int r;
1606
1607         /* This is mostly for debug purposes */
1608
1609         if (path_is_absolute(p)) {
1610                 if (!(c = strdup(p)))
1611                         return -ENOMEM;
1612         } else {
1613                 if (!(cwd = get_current_dir_name()))
1614                         return -errno;
1615
1616                 r = asprintf(&c, "%s/%s", cwd, p);
1617                 free(cwd);
1618
1619                 if (r < 0)
1620                         return -ENOMEM;
1621         }
1622
1623         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1624                 r = -errno;
1625                 free(c);
1626                 return r;
1627         }
1628
1629         return 0;
1630 }
1631
1632 char *unit_dbus_path(Unit *u) {
1633         char *p, *e;
1634
1635         assert(u);
1636
1637         if (!u->meta.id)
1638                 return NULL;
1639
1640         if (!(e = bus_path_escape(u->meta.id)))
1641                 return NULL;
1642
1643         p = strappend("/org/freedesktop/systemd1/unit/", e);
1644         free(e);
1645
1646         return p;
1647 }
1648
1649 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1650         CGroupBonding *l;
1651         int r;
1652
1653         assert(u);
1654         assert(b);
1655
1656         assert(b->path);
1657
1658         if (!b->controller)
1659                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1660                         return -ENOMEM;
1661
1662         /* Ensure this hasn't been added yet */
1663         assert(!b->unit);
1664
1665         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1666         LIST_PREPEND(CGroupBonding, by_path, l, b);
1667
1668         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1669                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1670                 return r;
1671         }
1672
1673         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1674         b->unit = u;
1675
1676         return 0;
1677 }
1678
1679 static char *default_cgroup_path(Unit *u) {
1680         char *p;
1681         int r;
1682
1683         assert(u);
1684
1685         if (u->meta.instance) {
1686                 char *t;
1687
1688                 if (!(t = unit_name_template(u->meta.id)))
1689                         return NULL;
1690
1691                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1692                 free(t);
1693         } else
1694                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1695
1696         return r < 0 ? NULL : p;
1697 }
1698
1699 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1700         char *controller = NULL, *path = NULL;
1701         CGroupBonding *b = NULL;
1702         int r;
1703
1704         assert(u);
1705         assert(name);
1706
1707         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1708                 return r;
1709
1710         if (!path)
1711                 path = default_cgroup_path(u);
1712
1713         if (!controller)
1714                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1715
1716         if (!path || !controller) {
1717                 free(path);
1718                 free(controller);
1719
1720                 return -ENOMEM;
1721         }
1722
1723         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1724                 r = -EEXIST;
1725                 goto fail;
1726         }
1727
1728         if (!(b = new0(CGroupBonding, 1))) {
1729                 r = -ENOMEM;
1730                 goto fail;
1731         }
1732
1733         b->controller = controller;
1734         b->path = path;
1735         b->only_us = false;
1736         b->clean_up = false;
1737
1738         if ((r = unit_add_cgroup(u, b)) < 0)
1739                 goto fail;
1740
1741         return 0;
1742
1743 fail:
1744         free(path);
1745         free(controller);
1746         free(b);
1747
1748         return r;
1749 }
1750
1751 int unit_add_default_cgroup(Unit *u) {
1752         CGroupBonding *b;
1753         int r = -ENOMEM;
1754
1755         assert(u);
1756
1757         /* Adds in the default cgroup data, if it wasn't specified yet */
1758
1759         if (unit_get_default_cgroup(u))
1760                 return 0;
1761
1762         if (!(b = new0(CGroupBonding, 1)))
1763                 return -ENOMEM;
1764
1765         if (!(b->path = default_cgroup_path(u)))
1766                 goto fail;
1767
1768         b->clean_up = true;
1769         b->only_us = true;
1770
1771         if ((r = unit_add_cgroup(u, b)) < 0)
1772                 goto fail;
1773
1774         return 0;
1775
1776 fail:
1777         free(b->path);
1778         free(b->controller);
1779         free(b);
1780
1781         return r;
1782 }
1783
1784 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1785         assert(u);
1786
1787         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1788 }
1789
1790 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1791         char *t;
1792         int r;
1793
1794         assert(u);
1795         assert(type);
1796         assert(_found);
1797
1798         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1799                 return -ENOMEM;
1800
1801         assert(!unit_has_name(u, t));
1802
1803         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1804         free(t);
1805
1806         assert(r < 0 || *_found != u);
1807
1808         return r;
1809 }
1810
1811 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1812         Unit *found;
1813         char *t;
1814
1815         assert(u);
1816         assert(type);
1817         assert(_found);
1818
1819         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1820                 return -ENOMEM;
1821
1822         assert(!unit_has_name(u, t));
1823
1824         found = manager_get_unit(u->meta.manager, t);
1825         free(t);
1826
1827         if (!found)
1828                 return -ENOENT;
1829
1830         *_found = found;
1831         return 0;
1832 }
1833
1834 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1835         Unit *u = userdata;
1836         assert(u);
1837
1838         return unit_name_to_prefix_and_instance(u->meta.id);
1839 }
1840
1841 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1842         Unit *u = userdata;
1843         assert(u);
1844
1845         return unit_name_to_prefix(u->meta.id);
1846 }
1847
1848 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1849         Unit *u = userdata;
1850         char *p, *r;
1851
1852         assert(u);
1853
1854         if (!(p = unit_name_to_prefix(u->meta.id)))
1855                 return NULL;
1856
1857         r = unit_name_unescape(p);
1858         free(p);
1859
1860         return r;
1861 }
1862
1863 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1864         Unit *u = userdata;
1865         assert(u);
1866
1867         if (u->meta.instance)
1868                 return unit_name_unescape(u->meta.instance);
1869
1870         return strdup("");
1871 }
1872
1873 char *unit_name_printf(Unit *u, const char* format) {
1874
1875         /*
1876          * This will use the passed string as format string and
1877          * replace the following specifiers:
1878          *
1879          * %n: the full id of the unit                 (foo@bar.waldo)
1880          * %N: the id of the unit without the suffix   (foo@bar)
1881          * %p: the prefix                              (foo)
1882          * %i: the instance                            (bar)
1883          */
1884
1885         const Specifier table[] = {
1886                 { 'n', specifier_string,              u->meta.id },
1887                 { 'N', specifier_prefix_and_instance, NULL },
1888                 { 'p', specifier_prefix,              NULL },
1889                 { 'i', specifier_string,              u->meta.instance },
1890                 { 0, NULL, NULL }
1891         };
1892
1893         assert(u);
1894         assert(format);
1895
1896         return specifier_printf(format, table, u);
1897 }
1898
1899 char *unit_full_printf(Unit *u, const char *format) {
1900
1901         /* This is similar to unit_name_printf() but also supports
1902          * unescaping */
1903
1904         const Specifier table[] = {
1905                 { 'n', specifier_string,              u->meta.id },
1906                 { 'N', specifier_prefix_and_instance, NULL },
1907                 { 'p', specifier_prefix,              NULL },
1908                 { 'P', specifier_prefix_unescaped,    NULL },
1909                 { 'i', specifier_string,              u->meta.instance },
1910                 { 'I', specifier_instance_unescaped,  NULL },
1911                 { 0, NULL, NULL }
1912         };
1913
1914         assert(u);
1915         assert(format);
1916
1917         return specifier_printf(format, table, u);
1918 }
1919
1920 char **unit_full_printf_strv(Unit *u, char **l) {
1921         size_t n;
1922         char **r, **i, **j;
1923
1924         /* Applies unit_full_printf to every entry in l */
1925
1926         assert(u);
1927
1928         n = strv_length(l);
1929         if (!(r = new(char*, n+1)))
1930                 return NULL;
1931
1932         for (i = l, j = r; *i; i++, j++)
1933                 if (!(*j = unit_full_printf(u, *i)))
1934                         goto fail;
1935
1936         *j = NULL;
1937         return r;
1938
1939 fail:
1940         j--;
1941         while (j >= r)
1942                 free(*j);
1943
1944         free(r);
1945
1946         return NULL;
1947 }
1948
1949 int unit_watch_bus_name(Unit *u, const char *name) {
1950         assert(u);
1951         assert(name);
1952
1953         /* Watch a specific name on the bus. We only support one unit
1954          * watching each name for now. */
1955
1956         return hashmap_put(u->meta.manager->watch_bus, name, u);
1957 }
1958
1959 void unit_unwatch_bus_name(Unit *u, const char *name) {
1960         assert(u);
1961         assert(name);
1962
1963         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1964 }
1965
1966 bool unit_can_serialize(Unit *u) {
1967         assert(u);
1968
1969         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1970 }
1971
1972 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1973         int r;
1974
1975         assert(u);
1976         assert(f);
1977         assert(fds);
1978
1979         if (!unit_can_serialize(u))
1980                 return 0;
1981
1982         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1983                 return r;
1984
1985         if (u->meta.job)
1986                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1987
1988         /* End marker */
1989         fputc('\n', f);
1990         return 0;
1991 }
1992
1993 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1994         va_list ap;
1995
1996         assert(u);
1997         assert(f);
1998         assert(key);
1999         assert(format);
2000
2001         fputs(key, f);
2002         fputc('=', f);
2003
2004         va_start(ap, format);
2005         vfprintf(f, format, ap);
2006         va_end(ap);
2007
2008         fputc('\n', f);
2009 }
2010
2011 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2012         assert(u);
2013         assert(f);
2014         assert(key);
2015         assert(value);
2016
2017         fprintf(f, "%s=%s\n", key, value);
2018 }
2019
2020 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2021         int r;
2022
2023         assert(u);
2024         assert(f);
2025         assert(fds);
2026
2027         if (!unit_can_serialize(u))
2028                 return 0;
2029
2030         for (;;) {
2031                 char line[1024], *l, *v;
2032                 size_t k;
2033
2034                 if (!fgets(line, sizeof(line), f)) {
2035                         if (feof(f))
2036                                 return 0;
2037                         return -errno;
2038                 }
2039
2040                 char_array_0(line);
2041                 l = strstrip(line);
2042
2043                 /* End marker */
2044                 if (l[0] == 0)
2045                         return 0;
2046
2047                 k = strcspn(l, "=");
2048
2049                 if (l[k] == '=') {
2050                         l[k] = 0;
2051                         v = l+k+1;
2052                 } else
2053                         v = l+k;
2054
2055                 if (streq(l, "job")) {
2056                         JobType type;
2057
2058                         if ((type = job_type_from_string(v)) < 0)
2059                                 log_debug("Failed to parse job type value %s", v);
2060                         else
2061                                 u->meta.deserialized_job = type;
2062
2063                         continue;
2064                 }
2065
2066                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2067                         return r;
2068         }
2069 }
2070
2071 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2072         Unit *device;
2073         char *e;
2074         int r;
2075
2076         assert(u);
2077
2078         if (!what)
2079                 return 0;
2080
2081         /* Adds in links to the device node that this unit is based on */
2082
2083         if (!is_device_path(what))
2084                 return 0;
2085
2086         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2087                 return -ENOMEM;
2088
2089         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2090         free(e);
2091
2092         if (r < 0)
2093                 return r;
2094
2095         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2096                 return r;
2097
2098         if (wants)
2099                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2100                         return r;
2101
2102         return 0;
2103 }
2104
2105 int unit_coldplug(Unit *u) {
2106         int r;
2107
2108         assert(u);
2109
2110         if (UNIT_VTABLE(u)->coldplug)
2111                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2112                         return r;
2113
2114         if (u->meta.deserialized_job >= 0) {
2115                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2116                         return r;
2117
2118                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2119         }
2120
2121         return 0;
2122 }
2123
2124 void unit_status_printf(Unit *u, const char *format, ...) {
2125         va_list ap;
2126
2127         assert(u);
2128         assert(format);
2129
2130         if (!UNIT_VTABLE(u)->show_status)
2131                 return;
2132
2133         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2134                 return;
2135
2136         if (!u->meta.manager->show_status)
2137                 return;
2138
2139         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2140                 return;
2141
2142         va_start(ap, format);
2143         status_vprintf(format, ap);
2144         va_end(ap);
2145 }
2146
2147 bool unit_need_daemon_reload(Unit *u) {
2148         struct stat st;
2149
2150         assert(u);
2151
2152         if (!u->meta.fragment_path)
2153                 return false;
2154
2155         zero(st);
2156         if (stat(u->meta.fragment_path, &st) < 0)
2157                 /* What, cannot access this anymore? */
2158                 return true;
2159
2160         return
2161                 u->meta.fragment_mtime &&
2162                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2163 }
2164
2165 void unit_reset_failed(Unit *u) {
2166         assert(u);
2167
2168         if (UNIT_VTABLE(u)->reset_failed)
2169                 UNIT_VTABLE(u)->reset_failed(u);
2170 }
2171
2172 Unit *unit_following(Unit *u) {
2173         assert(u);
2174
2175         if (UNIT_VTABLE(u)->following)
2176                 return UNIT_VTABLE(u)->following(u);
2177
2178         return NULL;
2179 }
2180
2181 bool unit_pending_inactive(Unit *u) {
2182         assert(u);
2183
2184         /* Returns true if the unit is inactive or going down */
2185
2186         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2187                 return true;
2188
2189         if (u->meta.job && u->meta.job->type == JOB_STOP)
2190                 return true;
2191
2192         return false;
2193 }
2194
2195 bool unit_pending_active(Unit *u) {
2196         assert(u);
2197
2198         /* Returns true if the unit is inactive or going down */
2199
2200         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2201                 return true;
2202
2203         if (u->meta.job &&
2204             (u->meta.job->type == JOB_START ||
2205              u->meta.job->type == JOB_RELOAD_OR_START ||
2206              u->meta.job->type == JOB_RESTART))
2207                 return true;
2208
2209         return false;
2210 }
2211
2212 UnitType unit_name_to_type(const char *n) {
2213         UnitType t;
2214
2215         assert(n);
2216
2217         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2218                 if (endswith(n, unit_vtable[t]->suffix))
2219                         return t;
2220
2221         return _UNIT_TYPE_INVALID;
2222 }
2223
2224 bool unit_name_is_valid(const char *n, bool template_ok) {
2225         UnitType t;
2226
2227         t = unit_name_to_type(n);
2228         if (t < 0 || t >= _UNIT_TYPE_MAX)
2229                 return false;
2230
2231         return unit_name_is_valid_no_type(n, template_ok);
2232 }
2233
2234 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2235         [UNIT_STUB] = "stub",
2236         [UNIT_LOADED] = "loaded",
2237         [UNIT_ERROR] = "error",
2238         [UNIT_MERGED] = "merged",
2239         [UNIT_MASKED] = "masked"
2240 };
2241
2242 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2243
2244 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2245         [UNIT_ACTIVE] = "active",
2246         [UNIT_RELOADING] = "reloading",
2247         [UNIT_INACTIVE] = "inactive",
2248         [UNIT_FAILED] = "failed",
2249         [UNIT_ACTIVATING] = "activating",
2250         [UNIT_DEACTIVATING] = "deactivating"
2251 };
2252
2253 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2254
2255 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2256         [UNIT_REQUIRES] = "Requires",
2257         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2258         [UNIT_WANTS] = "Wants",
2259         [UNIT_REQUISITE] = "Requisite",
2260         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2261         [UNIT_REQUIRED_BY] = "RequiredBy",
2262         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2263         [UNIT_WANTED_BY] = "WantedBy",
2264         [UNIT_CONFLICTS] = "Conflicts",
2265         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2266         [UNIT_BEFORE] = "Before",
2267         [UNIT_AFTER] = "After",
2268         [UNIT_REFERENCES] = "References",
2269         [UNIT_REFERENCED_BY] = "ReferencedBy",
2270         [UNIT_ON_FAILURE] = "OnFailure"
2271 };
2272
2273 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
2274
2275 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2276         [KILL_CONTROL_GROUP] = "control-group",
2277         [KILL_PROCESS_GROUP] = "process-group",
2278         [KILL_PROCESS] = "process",
2279         [KILL_NONE] = "none"
2280 };
2281
2282 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);