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 #include "cgroup-attr.h"
  46
  47 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  48         [UNIT_SERVICE] = &service_vtable,
  49         [UNIT_TIMER] = &timer_vtable,
  50         [UNIT_SOCKET] = &socket_vtable,
  51         [UNIT_TARGET] = &target_vtable,
  52         [UNIT_DEVICE] = &device_vtable,
  53         [UNIT_MOUNT] = &mount_vtable,
  54         [UNIT_AUTOMOUNT] = &automount_vtable,
  55         [UNIT_SNAPSHOT] = &snapshot_vtable,
  56         [UNIT_SWAP] = &swap_vtable,
  57         [UNIT_PATH] = &path_vtable
  58 };
  59
  60 Unit *unit_new(Manager *m, size_t size) {
  61         Unit *u;
  62
  63         assert(m);
  64         assert(size >= sizeof(Unit));
  65
  66         u = malloc0(size);
  67         if (!u)
  68                 return NULL;
  69
  70         u->names = set_new(string_hash_func, string_compare_func);
  71         if (!u->names) {
  72                 free(u);
  73                 return NULL;
  74         }
  75
  76         u->manager = m;
  77         u->type = _UNIT_TYPE_INVALID;
  78         u->deserialized_job = _JOB_TYPE_INVALID;
  79         u->default_dependencies = true;
  80         u->unit_file_state = _UNIT_FILE_STATE_INVALID;
  81
  82         return u;
  83 }
  84
  85 bool unit_has_name(Unit *u, const char *name) {
  86         assert(u);
  87         assert(name);
  88
  89         return !!set_get(u->names, (char*) name);
  90 }
  91
  92 int unit_add_name(Unit *u, const char *text) {
  93         UnitType t;
  94         char *s, *i = NULL;
  95         int r;
  96
  97         assert(u);
  98         assert(text);
  99
 100         if (unit_name_is_template(text)) {
 101                 if (!u->instance)
 102                         return -EINVAL;
 103
 104                 s = unit_name_replace_instance(text, u->instance);
 105         } else
 106                 s = strdup(text);
 107
 108         if (!s)
 109                 return -ENOMEM;
 110
 111         if (!unit_name_is_valid(s, false)) {
 112                 r = -EINVAL;
 113                 goto fail;
 114         }
 115
 116         assert_se((t = unit_name_to_type(s)) >= 0);
 117
 118         if (u->type != _UNIT_TYPE_INVALID && t != u->type) {
 119                 r = -EINVAL;
 120                 goto fail;
 121         }
 122
 123         if ((r = unit_name_to_instance(s, &i)) < 0)
 124                 goto fail;
 125
 126         if (i && unit_vtable[t]->no_instances) {
 127                 r = -EINVAL;
 128                 goto fail;
 129         }
 130
 131         /* Ensure that this unit is either instanced or not instanced,
 132          * but not both. */
 133         if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i) {
 134                 r = -EINVAL;
 135                 goto fail;
 136         }
 137
 138         if (unit_vtable[t]->no_alias &&
 139             !set_isempty(u->names) &&
 140             !set_get(u->names, s)) {
 141                 r = -EEXIST;
 142                 goto fail;
 143         }
 144
 145         if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES) {
 146                 r = -E2BIG;
 147                 goto fail;
 148         }
 149
 150         if ((r = set_put(u->names, s)) < 0) {
 151                 if (r == -EEXIST)
 152                         r = 0;
 153                 goto fail;
 154         }
 155
 156         if ((r = hashmap_put(u->manager->units, s, u)) < 0) {
 157                 set_remove(u->names, s);
 158                 goto fail;
 159         }
 160
 161         if (u->type == _UNIT_TYPE_INVALID) {
 162
 163                 u->type = t;
 164                 u->id = s;
 165                 u->instance = i;
 166
 167                 LIST_PREPEND(Unit, units_by_type, u->manager->units_by_type[t], u);
 168
 169                 if (UNIT_VTABLE(u)->init)
 170                         UNIT_VTABLE(u)->init(u);
 171         } else
 172                 free(i);
 173
 174         unit_add_to_dbus_queue(u);
 175         return 0;
 176
 177 fail:
 178         free(s);
 179         free(i);
 180
 181         return r;
 182 }
 183
 184 int unit_choose_id(Unit *u, const char *name) {
 185         char *s, *t = NULL, *i;
 186         int r;
 187
 188         assert(u);
 189         assert(name);
 190
 191         if (unit_name_is_template(name)) {
 192
 193                 if (!u->instance)
 194                         return -EINVAL;
 195
 196                 if (!(t = unit_name_replace_instance(name, u->instance)))
 197                         return -ENOMEM;
 198
 199                 name = t;
 200         }
 201
 202         /* Selects one of the names of this unit as the id */
 203         s = set_get(u->names, (char*) name);
 204         free(t);
 205
 206         if (!s)
 207                 return -ENOENT;
 208
 209         if ((r = unit_name_to_instance(s, &i)) < 0)
 210                 return r;
 211
 212         u->id = s;
 213
 214         free(u->instance);
 215         u->instance = i;
 216
 217         unit_add_to_dbus_queue(u);
 218
 219         return 0;
 220 }
 221
 222 int unit_set_description(Unit *u, const char *description) {
 223         char *s;
 224
 225         assert(u);
 226
 227         if (!(s = strdup(description)))
 228                 return -ENOMEM;
 229
 230         free(u->description);
 231         u->description = s;
 232
 233         unit_add_to_dbus_queue(u);
 234         return 0;
 235 }
 236
 237 bool unit_check_gc(Unit *u) {
 238         assert(u);
 239
 240         if (u->load_state == UNIT_STUB)
 241                 return true;
 242
 243         if (UNIT_VTABLE(u)->no_gc)
 244                 return true;
 245
 246         if (u->no_gc)
 247                 return true;
 248
 249         if (u->job)
 250                 return true;
 251
 252         if (unit_active_state(u) != UNIT_INACTIVE)
 253                 return true;
 254
 255         if (UNIT_VTABLE(u)->check_gc)
 256                 if (UNIT_VTABLE(u)->check_gc(u))
 257                         return true;
 258
 259         return false;
 260 }
 261
 262 void unit_add_to_load_queue(Unit *u) {
 263         assert(u);
 264         assert(u->type != _UNIT_TYPE_INVALID);
 265
 266         if (u->load_state != UNIT_STUB || u->in_load_queue)
 267                 return;
 268
 269         LIST_PREPEND(Unit, load_queue, u->manager->load_queue, u);
 270         u->in_load_queue = true;
 271 }
 272
 273 void unit_add_to_cleanup_queue(Unit *u) {
 274         assert(u);
 275
 276         if (u->in_cleanup_queue)
 277                 return;
 278
 279         LIST_PREPEND(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 280         u->in_cleanup_queue = true;
 281 }
 282
 283 void unit_add_to_gc_queue(Unit *u) {
 284         assert(u);
 285
 286         if (u->in_gc_queue || u->in_cleanup_queue)
 287                 return;
 288
 289         if (unit_check_gc(u))
 290                 return;
 291
 292         LIST_PREPEND(Unit, gc_queue, u->manager->gc_queue, u);
 293         u->in_gc_queue = true;
 294
 295         u->manager->n_in_gc_queue ++;
 296
 297         if (u->manager->gc_queue_timestamp <= 0)
 298                 u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 299 }
 300
 301 void unit_add_to_dbus_queue(Unit *u) {
 302         assert(u);
 303         assert(u->type != _UNIT_TYPE_INVALID);
 304
 305         if (u->load_state == UNIT_STUB || u->in_dbus_queue)
 306                 return;
 307
 308         /* Shortcut things if nobody cares */
 309         if (!bus_has_subscriber(u->manager)) {
 310                 u->sent_dbus_new_signal = true;
 311                 return;
 312         }
 313
 314         LIST_PREPEND(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 315         u->in_dbus_queue = true;
 316 }
 317
 318 static void bidi_set_free(Unit *u, Set *s) {
 319         Iterator i;
 320         Unit *other;
 321
 322         assert(u);
 323
 324         /* Frees the set and makes sure we are dropped from the
 325          * inverse pointers */
 326
 327         SET_FOREACH(other, s, i) {
 328                 UnitDependency d;
 329
 330                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 331                         set_remove(other->dependencies[d], u);
 332
 333                 unit_add_to_gc_queue(other);
 334         }
 335
 336         set_free(s);
 337 }
 338
 339 void unit_free(Unit *u) {
 340         UnitDependency d;
 341         Iterator i;
 342         char *t;
 343
 344         assert(u);
 345
 346         bus_unit_send_removed_signal(u);
 347
 348         if (u->load_state != UNIT_STUB)
 349                 if (UNIT_VTABLE(u)->done)
 350                         UNIT_VTABLE(u)->done(u);
 351
 352         SET_FOREACH(t, u->names, i)
 353                 hashmap_remove_value(u->manager->units, t, u);
 354
 355         if (u->job)
 356                 job_free(u->job);
 357
 358         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 359                 bidi_set_free(u, u->dependencies[d]);
 360
 361         if (u->type != _UNIT_TYPE_INVALID)
 362                 LIST_REMOVE(Unit, units_by_type, u->manager->units_by_type[u->type], u);
 363
 364         if (u->in_load_queue)
 365                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 366
 367         if (u->in_dbus_queue)
 368                 LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 369
 370         if (u->in_cleanup_queue)
 371                 LIST_REMOVE(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 372
 373         if (u->in_gc_queue) {
 374                 LIST_REMOVE(Unit, gc_queue, u->manager->gc_queue, u);
 375                 u->manager->n_in_gc_queue--;
 376         }
 377
 378         cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0);
 379         cgroup_attribute_free_list(u->cgroup_attributes);
 380
 381         free(u->description);
 382         free(u->fragment_path);
 383         free(u->instance);
 384
 385         set_free_free(u->names);
 386
 387         condition_free_list(u->conditions);
 388
 389         while (u->refs)
 390                 unit_ref_unset(u->refs);
 391
 392         free(u);
 393 }
 394
 395 UnitActiveState unit_active_state(Unit *u) {
 396         assert(u);
 397
 398         if (u->load_state == UNIT_MERGED)
 399                 return unit_active_state(unit_follow_merge(u));
 400
 401         /* After a reload it might happen that a unit is not correctly
 402          * loaded but still has a process around. That's why we won't
 403          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 404
 405         return UNIT_VTABLE(u)->active_state(u);
 406 }
 407
 408 const char* unit_sub_state_to_string(Unit *u) {
 409         assert(u);
 410
 411         return UNIT_VTABLE(u)->sub_state_to_string(u);
 412 }
 413
 414 static void complete_move(Set **s, Set **other) {
 415         assert(s);
 416         assert(other);
 417
 418         if (!*other)
 419                 return;
 420
 421         if (*s)
 422                 set_move(*s, *other);
 423         else {
 424                 *s = *other;
 425                 *other = NULL;
 426         }
 427 }
 428
 429 static void merge_names(Unit *u, Unit *other) {
 430         char *t;
 431         Iterator i;
 432
 433         assert(u);
 434         assert(other);
 435
 436         complete_move(&u->names, &other->names);
 437
 438         set_free_free(other->names);
 439         other->names = NULL;
 440         other->id = NULL;
 441
 442         SET_FOREACH(t, u->names, i)
 443                 assert_se(hashmap_replace(u->manager->units, t, u) == 0);
 444 }
 445
 446 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 447         Iterator i;
 448         Unit *back;
 449         int r;
 450
 451         assert(u);
 452         assert(other);
 453         assert(d < _UNIT_DEPENDENCY_MAX);
 454
 455         /* Fix backwards pointers */
 456         SET_FOREACH(back, other->dependencies[d], i) {
 457                 UnitDependency k;
 458
 459                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 460                         if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) {
 461
 462                                 if (r == -EEXIST)
 463                                         set_remove(back->dependencies[k], other);
 464                                 else
 465                                         assert(r == -ENOENT);
 466                         }
 467         }
 468
 469         complete_move(&u->dependencies[d], &other->dependencies[d]);
 470
 471         set_free(other->dependencies[d]);
 472         other->dependencies[d] = NULL;
 473 }
 474
 475 int unit_merge(Unit *u, Unit *other) {
 476         UnitDependency d;
 477
 478         assert(u);
 479         assert(other);
 480         assert(u->manager == other->manager);
 481         assert(u->type != _UNIT_TYPE_INVALID);
 482
 483         other = unit_follow_merge(other);
 484
 485         if (other == u)
 486                 return 0;
 487
 488         if (u->type != other->type)
 489                 return -EINVAL;
 490
 491         if (!u->instance != !other->instance)
 492                 return -EINVAL;
 493
 494         if (other->load_state != UNIT_STUB &&
 495             other->load_state != UNIT_ERROR)
 496                 return -EEXIST;
 497
 498         if (other->job)
 499                 return -EEXIST;
 500
 501         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 502                 return -EEXIST;
 503
 504         /* Merge names */
 505         merge_names(u, other);
 506
 507         /* Redirect all references */
 508         while (other->refs)
 509                 unit_ref_set(other->refs, u);
 510
 511         /* Merge dependencies */
 512         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 513                 merge_dependencies(u, other, d);
 514
 515         other->load_state = UNIT_MERGED;
 516         other->merged_into = u;
 517
 518         /* If there is still some data attached to the other node, we
 519          * don't need it anymore, and can free it. */
 520         if (other->load_state != UNIT_STUB)
 521                 if (UNIT_VTABLE(other)->done)
 522                         UNIT_VTABLE(other)->done(other);
 523
 524         unit_add_to_dbus_queue(u);
 525         unit_add_to_cleanup_queue(other);
 526
 527         return 0;
 528 }
 529
 530 int unit_merge_by_name(Unit *u, const char *name) {
 531         Unit *other;
 532         int r;
 533         char *s = NULL;
 534
 535         assert(u);
 536         assert(name);
 537
 538         if (unit_name_is_template(name)) {
 539                 if (!u->instance)
 540                         return -EINVAL;
 541
 542                 if (!(s = unit_name_replace_instance(name, u->instance)))
 543                         return -ENOMEM;
 544
 545                 name = s;
 546         }
 547
 548         if (!(other = manager_get_unit(u->manager, name)))
 549                 r = unit_add_name(u, name);
 550         else
 551                 r = unit_merge(u, other);
 552
 553         free(s);
 554         return r;
 555 }
 556
 557 Unit* unit_follow_merge(Unit *u) {
 558         assert(u);
 559
 560         while (u->load_state == UNIT_MERGED)
 561                 assert_se(u = u->merged_into);
 562
 563         return u;
 564 }
 565
 566 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 567         int r;
 568
 569         assert(u);
 570         assert(c);
 571
 572         if (c->std_output != EXEC_OUTPUT_KMSG &&
 573             c->std_output != EXEC_OUTPUT_SYSLOG &&
 574             c->std_output != EXEC_OUTPUT_JOURNAL &&
 575             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 576             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 577             c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 578             c->std_error != EXEC_OUTPUT_KMSG &&
 579             c->std_error != EXEC_OUTPUT_SYSLOG &&
 580             c->std_error != EXEC_OUTPUT_JOURNAL &&
 581             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 582             c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 583             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 584                 return 0;
 585
 586         /* If syslog or kernel logging is requested, make sure our own
 587          * logging daemon is run first. */
 588
 589         if (u->manager->running_as == MANAGER_SYSTEM)
 590                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true)) < 0)
 591                         return r;
 592
 593         return 0;
 594 }
 595
 596 const char *unit_description(Unit *u) {
 597         assert(u);
 598
 599         if (u->description)
 600                 return u->description;
 601
 602         return strna(u->id);
 603 }
 604
 605 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 606         char *t;
 607         UnitDependency d;
 608         Iterator i;
 609         char *p2;
 610         const char *prefix2;
 611         char
 612                 timestamp1[FORMAT_TIMESTAMP_MAX],
 613                 timestamp2[FORMAT_TIMESTAMP_MAX],
 614                 timestamp3[FORMAT_TIMESTAMP_MAX],
 615                 timestamp4[FORMAT_TIMESTAMP_MAX],
 616                 timespan[FORMAT_TIMESPAN_MAX];
 617         Unit *following;
 618
 619         assert(u);
 620         assert(u->type >= 0);
 621
 622         if (!prefix)
 623                 prefix = "";
 624         p2 = strappend(prefix, "\t");
 625         prefix2 = p2 ? p2 : prefix;
 626
 627         fprintf(f,
 628                 "%s-> Unit %s:\n"
 629                 "%s\tDescription: %s\n"
 630                 "%s\tInstance: %s\n"
 631                 "%s\tUnit Load State: %s\n"
 632                 "%s\tUnit Active State: %s\n"
 633                 "%s\tInactive Exit Timestamp: %s\n"
 634                 "%s\tActive Enter Timestamp: %s\n"
 635                 "%s\tActive Exit Timestamp: %s\n"
 636                 "%s\tInactive Enter Timestamp: %s\n"
 637                 "%s\tGC Check Good: %s\n"
 638                 "%s\tNeed Daemon Reload: %s\n",
 639                 prefix, u->id,
 640                 prefix, unit_description(u),
 641                 prefix, strna(u->instance),
 642                 prefix, unit_load_state_to_string(u->load_state),
 643                 prefix, unit_active_state_to_string(unit_active_state(u)),
 644                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
 645                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
 646                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
 647                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
 648                 prefix, yes_no(unit_check_gc(u)),
 649                 prefix, yes_no(unit_need_daemon_reload(u)));
 650
 651         SET_FOREACH(t, u->names, i)
 652                 fprintf(f, "%s\tName: %s\n", prefix, t);
 653
 654         if ((following = unit_following(u)))
 655                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);
 656
 657         if (u->fragment_path)
 658                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);
 659
 660         if (u->job_timeout > 0)
 661                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout));
 662
 663         condition_dump_list(u->conditions, f, prefix);
 664
 665         if (dual_timestamp_is_set(&u->condition_timestamp))
 666                 fprintf(f,
 667                         "%s\tCondition Timestamp: %s\n"
 668                         "%s\tCondition Result: %s\n",
 669                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
 670                         prefix, yes_no(u->condition_result));
 671
 672         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 673                 Unit *other;
 674
 675                 SET_FOREACH(other, u->dependencies[d], i)
 676                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
 677         }
 678
 679         if (u->load_state == UNIT_LOADED) {
 680                 CGroupBonding *b;
 681                 CGroupAttribute *a;
 682
 683                 fprintf(f,
 684                         "%s\tStopWhenUnneeded: %s\n"
 685                         "%s\tRefuseManualStart: %s\n"
 686                         "%s\tRefuseManualStop: %s\n"
 687                         "%s\tDefaultDependencies: %s\n"
 688                         "%s\tOnFailureIsolate: %s\n"
 689                         "%s\tIgnoreOnIsolate: %s\n"
 690                         "%s\tIgnoreOnSnapshot: %s\n",
 691                         prefix, yes_no(u->stop_when_unneeded),
 692                         prefix, yes_no(u->refuse_manual_start),
 693                         prefix, yes_no(u->refuse_manual_stop),
 694                         prefix, yes_no(u->default_dependencies),
 695                         prefix, yes_no(u->on_failure_isolate),
 696                         prefix, yes_no(u->ignore_on_isolate),
 697                         prefix, yes_no(u->ignore_on_snapshot));
 698
 699                 LIST_FOREACH(by_unit, b, u->cgroup_bondings)
 700                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 701                                 prefix, b->controller, b->path);
 702
 703                 LIST_FOREACH(by_unit, a, u->cgroup_attributes) {
 704                         char *v = NULL;
 705
 706                         if (a->map_callback)
 707                                 a->map_callback(a->controller, a->name, a->value, &v);
 708
 709                         fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
 710                                 prefix, a->controller, a->name, v ? v : a->value);
 711
 712                         free(v);
 713                 }
 714
 715                 if (UNIT_VTABLE(u)->dump)
 716                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 717
 718         } else if (u->load_state == UNIT_MERGED)
 719                 fprintf(f,
 720                         "%s\tMerged into: %s\n",
 721                         prefix, u->merged_into->id);
 722         else if (u->load_state == UNIT_ERROR)
 723                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
 724
 725
 726         if (u->job)
 727                 job_dump(u->job, f, prefix2);
 728
 729         free(p2);
 730 }
 731
 732 /* Common implementation for multiple backends */
 733 int unit_load_fragment_and_dropin(Unit *u) {
 734         int r;
 735
 736         assert(u);
 737
 738         /* Load a .service file */
 739         if ((r = unit_load_fragment(u)) < 0)
 740                 return r;
 741
 742         if (u->load_state == UNIT_STUB)
 743                 return -ENOENT;
 744
 745         /* Load drop-in directory data */
 746         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 747                 return r;
 748
 749         return 0;
 750 }
 751
 752 /* Common implementation for multiple backends */
 753 int unit_load_fragment_and_dropin_optional(Unit *u) {
 754         int r;
 755
 756         assert(u);
 757
 758         /* Same as unit_load_fragment_and_dropin(), but whether
 759          * something can be loaded or not doesn't matter. */
 760
 761         /* Load a .service file */
 762         if ((r = unit_load_fragment(u)) < 0)
 763                 return r;
 764
 765         if (u->load_state == UNIT_STUB)
 766                 u->load_state = UNIT_LOADED;
 767
 768         /* Load drop-in directory data */
 769         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 770                 return r;
 771
 772         return 0;
 773 }
 774
 775 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 776         assert(u);
 777         assert(target);
 778
 779         if (target->type != UNIT_TARGET)
 780                 return 0;
 781
 782         /* Only add the dependency if both units are loaded, so that
 783          * that loop check below is reliable */
 784         if (u->load_state != UNIT_LOADED ||
 785             target->load_state != UNIT_LOADED)
 786                 return 0;
 787
 788         /* If either side wants no automatic dependencies, then let's
 789          * skip this */
 790         if (!u->default_dependencies ||
 791             !target->default_dependencies)
 792                 return 0;
 793
 794         /* Don't create loops */
 795         if (set_get(target->dependencies[UNIT_BEFORE], u))
 796                 return 0;
 797
 798         return unit_add_dependency(target, UNIT_AFTER, u, true);
 799 }
 800
 801 static int unit_add_default_dependencies(Unit *u) {
 802         static const UnitDependency deps[] = {
 803                 UNIT_REQUIRED_BY,
 804                 UNIT_REQUIRED_BY_OVERRIDABLE,
 805                 UNIT_WANTED_BY,
 806                 UNIT_BOUND_BY
 807         };
 808
 809         Unit *target;
 810         Iterator i;
 811         int r;
 812         unsigned k;
 813
 814         assert(u);
 815
 816         for (k = 0; k < ELEMENTSOF(deps); k++)
 817                 SET_FOREACH(target, u->dependencies[deps[k]], i)
 818                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 819                                 return r;
 820
 821         return 0;
 822 }
 823
 824 int unit_load(Unit *u) {
 825         int r;
 826
 827         assert(u);
 828
 829         if (u->in_load_queue) {
 830                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 831                 u->in_load_queue = false;
 832         }
 833
 834         if (u->type == _UNIT_TYPE_INVALID)
 835                 return -EINVAL;
 836
 837         if (u->load_state != UNIT_STUB)
 838                 return 0;
 839
 840         if (UNIT_VTABLE(u)->load)
 841                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 842                         goto fail;
 843
 844         if (u->load_state == UNIT_STUB) {
 845                 r = -ENOENT;
 846                 goto fail;
 847         }
 848
 849         if (u->load_state == UNIT_LOADED &&
 850             u->default_dependencies)
 851                 if ((r = unit_add_default_dependencies(u)) < 0)
 852                         goto fail;
 853
 854         if (u->on_failure_isolate &&
 855             set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {
 856
 857                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 858                           u->id);
 859
 860                 r = -EINVAL;
 861                 goto fail;
 862         }
 863
 864         assert((u->load_state != UNIT_MERGED) == !u->merged_into);
 865
 866         unit_add_to_dbus_queue(unit_follow_merge(u));
 867         unit_add_to_gc_queue(u);
 868
 869         return 0;
 870
 871 fail:
 872         u->load_state = UNIT_ERROR;
 873         u->load_error = r;
 874         unit_add_to_dbus_queue(u);
 875         unit_add_to_gc_queue(u);
 876
 877         log_debug("Failed to load configuration for %s: %s", u->id, strerror(-r));
 878
 879         return r;
 880 }
 881
 882 bool unit_condition_test(Unit *u) {
 883         assert(u);
 884
 885         dual_timestamp_get(&u->condition_timestamp);
 886         u->condition_result = condition_test_list(u->conditions);
 887
 888         return u->condition_result;
 889 }
 890
 891 /* Errors:
 892  *         -EBADR:     This unit type does not support starting.
 893  *         -EALREADY:  Unit is already started.
 894  *         -EAGAIN:    An operation is already in progress. Retry later.
 895  *         -ECANCELED: Too many requests for now.
 896  */
 897 int unit_start(Unit *u) {
 898         UnitActiveState state;
 899         Unit *following;
 900
 901         assert(u);
 902
 903         if (u->load_state != UNIT_LOADED)
 904                 return -EINVAL;
 905
 906         /* If this is already started, then this will succeed. Note
 907          * that this will even succeed if this unit is not startable
 908          * by the user. This is relied on to detect when we need to
 909          * wait for units and when waiting is finished. */
 910         state = unit_active_state(u);
 911         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 912                 return -EALREADY;
 913
 914         /* If the conditions failed, don't do anything at all. If we
 915          * already are activating this call might still be useful to
 916          * speed up activation in case there is some hold-off time,
 917          * but we don't want to recheck the condition in that case. */
 918         if (state != UNIT_ACTIVATING &&
 919             !unit_condition_test(u)) {
 920                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->id);
 921                 return -EALREADY;
 922         }
 923
 924         /* Forward to the main object, if we aren't it. */
 925         if ((following = unit_following(u))) {
 926                 log_debug("Redirecting start request from %s to %s.", u->id, following->id);
 927                 return unit_start(following);
 928         }
 929
 930         /* If it is stopped, but we cannot start it, then fail */
 931         if (!UNIT_VTABLE(u)->start)
 932                 return -EBADR;
 933
 934         /* We don't suppress calls to ->start() here when we are
 935          * already starting, to allow this request to be used as a
 936          * "hurry up" call, for example when the unit is in some "auto
 937          * restart" state where it waits for a holdoff timer to elapse
 938          * before it will start again. */
 939
 940         unit_add_to_dbus_queue(u);
 941
 942         unit_status_printf(u, NULL, "Starting %s...", unit_description(u));
 943         return UNIT_VTABLE(u)->start(u);
 944 }
 945
 946 bool unit_can_start(Unit *u) {
 947         assert(u);
 948
 949         return !!UNIT_VTABLE(u)->start;
 950 }
 951
 952 bool unit_can_isolate(Unit *u) {
 953         assert(u);
 954
 955         return unit_can_start(u) &&
 956                 u->allow_isolate;
 957 }
 958
 959 /* Errors:
 960  *         -EBADR:    This unit type does not support stopping.
 961  *         -EALREADY: Unit is already stopped.
 962  *         -EAGAIN:   An operation is already in progress. Retry later.
 963  */
 964 int unit_stop(Unit *u) {
 965         UnitActiveState state;
 966         Unit *following;
 967
 968         assert(u);
 969
 970         state = unit_active_state(u);
 971         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 972                 return -EALREADY;
 973
 974         if ((following = unit_following(u))) {
 975                 log_debug("Redirecting stop request from %s to %s.", u->id, following->id);
 976                 return unit_stop(following);
 977         }
 978
 979         if (!UNIT_VTABLE(u)->stop)
 980                 return -EBADR;
 981
 982         unit_add_to_dbus_queue(u);
 983
 984         unit_status_printf(u, NULL, "Stopping %s...", unit_description(u));
 985         return UNIT_VTABLE(u)->stop(u);
 986 }
 987
 988 /* Errors:
 989  *         -EBADR:    This unit type does not support reloading.
 990  *         -ENOEXEC:  Unit is not started.
 991  *         -EAGAIN:   An operation is already in progress. Retry later.
 992  */
 993 int unit_reload(Unit *u) {
 994         UnitActiveState state;
 995         Unit *following;
 996
 997         assert(u);
 998
 999         if (u->load_state != UNIT_LOADED)
1000                 return -EINVAL;
1001
1002         if (!unit_can_reload(u))
1003                 return -EBADR;
1004
1005         state = unit_active_state(u);
1006         if (state == UNIT_RELOADING)
1007                 return -EALREADY;
1008
1009         if (state != UNIT_ACTIVE)
1010                 return -ENOEXEC;
1011
1012         if ((following = unit_following(u))) {
1013                 log_debug("Redirecting reload request from %s to %s.", u->id, following->id);
1014                 return unit_reload(following);
1015         }
1016
1017         unit_add_to_dbus_queue(u);
1018         return UNIT_VTABLE(u)->reload(u);
1019 }
1020
1021 bool unit_can_reload(Unit *u) {
1022         assert(u);
1023
1024         if (!UNIT_VTABLE(u)->reload)
1025                 return false;
1026
1027         if (!UNIT_VTABLE(u)->can_reload)
1028                 return true;
1029
1030         return UNIT_VTABLE(u)->can_reload(u);
1031 }
1032
1033 static void unit_check_unneeded(Unit *u) {
1034         Iterator i;
1035         Unit *other;
1036
1037         assert(u);
1038
1039         /* If this service shall be shut down when unneeded then do
1040          * so. */
1041
1042         if (!u->stop_when_unneeded)
1043                 return;
1044
1045         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1046                 return;
1047
1048         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
1049                 if (unit_pending_active(other))
1050                         return;
1051
1052         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1053                 if (unit_pending_active(other))
1054                         return;
1055
1056         SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
1057                 if (unit_pending_active(other))
1058                         return;
1059
1060         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1061                 if (unit_pending_active(other))
1062                         return;
1063
1064         log_info("Service %s is not needed anymore. Stopping.", u->id);
1065
1066         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1067         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1068 }
1069
1070 static void retroactively_start_dependencies(Unit *u) {
1071         Iterator i;
1072         Unit *other;
1073
1074         assert(u);
1075         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1076
1077         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1078                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1079                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1080                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1081
1082         SET_FOREACH(other, u->dependencies[UNIT_BIND_TO], i)
1083                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1084                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1085                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1086
1087         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1088                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1089                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1090                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1091
1092         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1093                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1094                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1095                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1096
1097         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1098                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1099                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1100                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1101
1102         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)
1103                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1104                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1105
1106         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
1107                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1108                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1109 }
1110
1111 static void retroactively_stop_dependencies(Unit *u) {
1112         Iterator i;
1113         Unit *other;
1114
1115         assert(u);
1116         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1117
1118         /* Pull down units which are bound to us recursively if enabled */
1119         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1120                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1121                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1122 }
1123
1124 static void check_unneeded_dependencies(Unit *u) {
1125         Iterator i;
1126         Unit *other;
1127
1128         assert(u);
1129         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1130
1131         /* Garbage collect services that might not be needed anymore, if enabled */
1132         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1133                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1134                         unit_check_unneeded(other);
1135         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1136                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1137                         unit_check_unneeded(other);
1138         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1139                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1140                         unit_check_unneeded(other);
1141         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1142                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1143                         unit_check_unneeded(other);
1144         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1145                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1146                         unit_check_unneeded(other);
1147         SET_FOREACH(other, u->dependencies[UNIT_BIND_TO], i)
1148                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1149                         unit_check_unneeded(other);
1150 }
1151
1152 void unit_trigger_on_failure(Unit *u) {
1153         Unit *other;
1154         Iterator i;
1155
1156         assert(u);
1157
1158         if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)
1159                 return;
1160
1161         log_info("Triggering OnFailure= dependencies of %s.", u->id);
1162
1163         SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {
1164                 int r;
1165
1166                 if ((r = manager_add_job(u->manager, JOB_START, other, u->on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1167                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1168         }
1169 }
1170
1171 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1172         bool unexpected;
1173
1174         assert(u);
1175         assert(os < _UNIT_ACTIVE_STATE_MAX);
1176         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1177
1178         /* Note that this is called for all low-level state changes,
1179          * even if they might map to the same high-level
1180          * UnitActiveState! That means that ns == os is OK an expected
1181          * behaviour here. For example: if a mount point is remounted
1182          * this function will be called too! */
1183
1184         if (u->manager->n_reloading <= 0) {
1185                 dual_timestamp ts;
1186
1187                 dual_timestamp_get(&ts);
1188
1189                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1190                         u->inactive_exit_timestamp = ts;
1191                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1192                         u->inactive_enter_timestamp = ts;
1193
1194                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1195                         u->active_enter_timestamp = ts;
1196                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1197                         u->active_exit_timestamp = ts;
1198
1199                 timer_unit_notify(u, ns);
1200                 path_unit_notify(u, ns);
1201         }
1202
1203         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1204                 cgroup_bonding_trim_list(u->cgroup_bondings, true);
1205
1206         if (u->job) {
1207                 unexpected = false;
1208
1209                 if (u->job->state == JOB_WAITING)
1210
1211                         /* So we reached a different state for this
1212                          * job. Let's see if we can run it now if it
1213                          * failed previously due to EAGAIN. */
1214                         job_add_to_run_queue(u->job);
1215
1216                 /* Let's check whether this state change constitutes a
1217                  * finished job, or maybe contradicts a running job and
1218                  * hence needs to invalidate jobs. */
1219
1220                 switch (u->job->type) {
1221
1222                 case JOB_START:
1223                 case JOB_VERIFY_ACTIVE:
1224
1225                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1226                                 job_finish_and_invalidate(u->job, JOB_DONE);
1227                         else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1228                                 unexpected = true;
1229
1230                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1231                                         job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1232                         }
1233
1234                         break;
1235
1236                 case JOB_RELOAD:
1237                 case JOB_RELOAD_OR_START:
1238
1239                         if (u->job->state == JOB_RUNNING) {
1240                                 if (ns == UNIT_ACTIVE)
1241                                         job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED);
1242                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1243                                         unexpected = true;
1244
1245                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1246                                                 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1247                                 }
1248                         }
1249
1250                         break;
1251
1252                 case JOB_STOP:
1253                 case JOB_RESTART:
1254                 case JOB_TRY_RESTART:
1255
1256                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1257                                 job_finish_and_invalidate(u->job, JOB_DONE);
1258                         else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1259                                 unexpected = true;
1260                                 job_finish_and_invalidate(u->job, JOB_FAILED);
1261                         }
1262
1263                         break;
1264
1265                 default:
1266                         assert_not_reached("Job type unknown");
1267                 }
1268
1269         } else
1270                 unexpected = true;
1271
1272         if (u->manager->n_reloading <= 0) {
1273
1274                 /* If this state change happened without being
1275                  * requested by a job, then let's retroactively start
1276                  * or stop dependencies. We skip that step when
1277                  * deserializing, since we don't want to create any
1278                  * additional jobs just because something is already
1279                  * activated. */
1280
1281                 if (unexpected) {
1282                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1283                                 retroactively_start_dependencies(u);
1284                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1285                                 retroactively_stop_dependencies(u);
1286                 }
1287
1288                 /* stop unneeded units regardless if going down was expected or not */
1289                 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1290                         check_unneeded_dependencies(u);
1291
1292                 if (ns != os && ns == UNIT_FAILED) {
1293                         log_notice("Unit %s entered failed state.", u->id);
1294                         unit_trigger_on_failure(u);
1295                 }
1296         }
1297
1298         /* Some names are special */
1299         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1300
1301                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1302                         /* The bus just might have become available,
1303                          * hence try to connect to it, if we aren't
1304                          * yet connected. */
1305                         bus_init(u->manager, true);
1306
1307                 if (u->type == UNIT_SERVICE &&
1308                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1309                     u->manager->n_reloading <= 0) {
1310                         /* Write audit record if we have just finished starting up */
1311                         manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, true);
1312                         u->in_audit = true;
1313                 }
1314
1315                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1316                         manager_send_unit_plymouth(u->manager, u);
1317
1318         } else {
1319
1320                 /* We don't care about D-Bus here, since we'll get an
1321                  * asynchronous notification for it anyway. */
1322
1323                 if (u->type == UNIT_SERVICE &&
1324                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1325                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1326                     u->manager->n_reloading <= 0) {
1327
1328                         /* Hmm, if there was no start record written
1329                          * write it now, so that we always have a nice
1330                          * pair */
1331                         if (!u->in_audit) {
1332                                 manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1333
1334                                 if (ns == UNIT_INACTIVE)
1335                                         manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, true);
1336                         } else
1337                                 /* Write audit record if we have just finished shutting down */
1338                                 manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1339
1340                         u->in_audit = false;
1341                 }
1342         }
1343
1344         manager_recheck_journal(u->manager);
1345
1346         /* Maybe we finished startup and are now ready for being
1347          * stopped because unneeded? */
1348         unit_check_unneeded(u);
1349
1350         unit_add_to_dbus_queue(u);
1351         unit_add_to_gc_queue(u);
1352 }
1353
1354 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1355         struct epoll_event ev;
1356
1357         assert(u);
1358         assert(fd >= 0);
1359         assert(w);
1360         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1361
1362         zero(ev);
1363         ev.data.ptr = w;
1364         ev.events = events;
1365
1366         if (epoll_ctl(u->manager->epoll_fd,
1367                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1368                       fd,
1369                       &ev) < 0)
1370                 return -errno;
1371
1372         w->fd = fd;
1373         w->type = WATCH_FD;
1374         w->data.unit = u;
1375
1376         return 0;
1377 }
1378
1379 void unit_unwatch_fd(Unit *u, Watch *w) {
1380         assert(u);
1381         assert(w);
1382
1383         if (w->type == WATCH_INVALID)
1384                 return;
1385
1386         assert(w->type == WATCH_FD);
1387         assert(w->data.unit == u);
1388         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1389
1390         w->fd = -1;
1391         w->type = WATCH_INVALID;
1392         w->data.unit = NULL;
1393 }
1394
1395 int unit_watch_pid(Unit *u, pid_t pid) {
1396         assert(u);
1397         assert(pid >= 1);
1398
1399         /* Watch a specific PID. We only support one unit watching
1400          * each PID for now. */
1401
1402         return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1403 }
1404
1405 void unit_unwatch_pid(Unit *u, pid_t pid) {
1406         assert(u);
1407         assert(pid >= 1);
1408
1409         hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1410 }
1411
1412 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1413         struct itimerspec its;
1414         int flags, fd;
1415         bool ours;
1416
1417         assert(u);
1418         assert(w);
1419         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1420
1421         /* This will try to reuse the old timer if there is one */
1422
1423         if (w->type == WATCH_UNIT_TIMER) {
1424                 assert(w->data.unit == u);
1425                 assert(w->fd >= 0);
1426
1427                 ours = false;
1428                 fd = w->fd;
1429         } else if (w->type == WATCH_INVALID) {
1430
1431                 ours = true;
1432                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1433                         return -errno;
1434         } else
1435                 assert_not_reached("Invalid watch type");
1436
1437         zero(its);
1438
1439         if (delay <= 0) {
1440                 /* Set absolute time in the past, but not 0, since we
1441                  * don't want to disarm the timer */
1442                 its.it_value.tv_sec = 0;
1443                 its.it_value.tv_nsec = 1;
1444
1445                 flags = TFD_TIMER_ABSTIME;
1446         } else {
1447                 timespec_store(&its.it_value, delay);
1448                 flags = 0;
1449         }
1450
1451         /* This will also flush the elapse counter */
1452         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1453                 goto fail;
1454
1455         if (w->type == WATCH_INVALID) {
1456                 struct epoll_event ev;
1457
1458                 zero(ev);
1459                 ev.data.ptr = w;
1460                 ev.events = EPOLLIN;
1461
1462                 if (epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1463                         goto fail;
1464         }
1465
1466         w->type = WATCH_UNIT_TIMER;
1467         w->fd = fd;
1468         w->data.unit = u;
1469
1470         return 0;
1471
1472 fail:
1473         if (ours)
1474                 close_nointr_nofail(fd);
1475
1476         return -errno;
1477 }
1478
1479 void unit_unwatch_timer(Unit *u, Watch *w) {
1480         assert(u);
1481         assert(w);
1482
1483         if (w->type == WATCH_INVALID)
1484                 return;
1485
1486         assert(w->type == WATCH_UNIT_TIMER);
1487         assert(w->data.unit == u);
1488         assert(w->fd >= 0);
1489
1490         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1491         close_nointr_nofail(w->fd);
1492
1493         w->fd = -1;
1494         w->type = WATCH_INVALID;
1495         w->data.unit = NULL;
1496 }
1497
1498 bool unit_job_is_applicable(Unit *u, JobType j) {
1499         assert(u);
1500         assert(j >= 0 && j < _JOB_TYPE_MAX);
1501
1502         switch (j) {
1503
1504         case JOB_VERIFY_ACTIVE:
1505         case JOB_START:
1506         case JOB_STOP:
1507                 return true;
1508
1509         case JOB_RESTART:
1510         case JOB_TRY_RESTART:
1511                 return unit_can_start(u);
1512
1513         case JOB_RELOAD:
1514                 return unit_can_reload(u);
1515
1516         case JOB_RELOAD_OR_START:
1517                 return unit_can_reload(u) && unit_can_start(u);
1518
1519         default:
1520                 assert_not_reached("Invalid job type");
1521         }
1522 }
1523
1524 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1525
1526         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1527                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1528                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1529                 [UNIT_WANTS] = UNIT_WANTED_BY,
1530                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1531                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1532                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1533                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1534                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1535                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1536                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1537                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1538                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1539                 [UNIT_BEFORE] = UNIT_AFTER,
1540                 [UNIT_AFTER] = UNIT_BEFORE,
1541                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1542                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1543                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES,
1544                 [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,
1545                 [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,
1546                 [UNIT_PROPAGATE_RELOAD_TO] = UNIT_PROPAGATE_RELOAD_FROM,
1547                 [UNIT_PROPAGATE_RELOAD_FROM] = UNIT_PROPAGATE_RELOAD_TO
1548         };
1549         int r, q = 0, v = 0, w = 0;
1550
1551         assert(u);
1552         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1553         assert(other);
1554
1555         u = unit_follow_merge(u);
1556         other = unit_follow_merge(other);
1557
1558         /* We won't allow dependencies on ourselves. We will not
1559          * consider them an error however. */
1560         if (u == other)
1561                 return 0;
1562
1563         if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1564                 return r;
1565
1566         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1567                 if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1568                         return r;
1569
1570         if (add_reference)
1571                 if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1572                     (r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1573                         return r;
1574
1575         if ((q = set_put(u->dependencies[d], other)) < 0)
1576                 return q;
1577
1578         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1579                 if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) {
1580                         r = v;
1581                         goto fail;
1582                 }
1583
1584         if (add_reference) {
1585                 if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) {
1586                         r = w;
1587                         goto fail;
1588                 }
1589
1590                 if ((r = set_put(other->dependencies[UNIT_REFERENCED_BY], u)) < 0)
1591                         goto fail;
1592         }
1593
1594         unit_add_to_dbus_queue(u);
1595         return 0;
1596
1597 fail:
1598         if (q > 0)
1599                 set_remove(u->dependencies[d], other);
1600
1601         if (v > 0)
1602                 set_remove(other->dependencies[inverse_table[d]], u);
1603
1604         if (w > 0)
1605                 set_remove(u->dependencies[UNIT_REFERENCES], other);
1606
1607         return r;
1608 }
1609
1610 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1611         int r;
1612
1613         assert(u);
1614
1615         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1616                 return r;
1617
1618         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1619                 return r;
1620
1621         return 0;
1622 }
1623
1624 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1625         char *s;
1626
1627         assert(u);
1628         assert(name || path);
1629
1630         if (!name)
1631                 name = file_name_from_path(path);
1632
1633         if (!unit_name_is_template(name)) {
1634                 *p = NULL;
1635                 return name;
1636         }
1637
1638         if (u->instance)
1639                 s = unit_name_replace_instance(name, u->instance);
1640         else {
1641                 char *i;
1642
1643                 if (!(i = unit_name_to_prefix(u->id)))
1644                         return NULL;
1645
1646                 s = unit_name_replace_instance(name, i);
1647                 free(i);
1648         }
1649
1650         if (!s)
1651                 return NULL;
1652
1653         *p = s;
1654         return s;
1655 }
1656
1657 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1658         Unit *other;
1659         int r;
1660         char *s;
1661
1662         assert(u);
1663         assert(name || path);
1664
1665         if (!(name = resolve_template(u, name, path, &s)))
1666                 return -ENOMEM;
1667
1668         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1669                 goto finish;
1670
1671         r = unit_add_dependency(u, d, other, add_reference);
1672
1673 finish:
1674         free(s);
1675         return r;
1676 }
1677
1678 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1679         Unit *other;
1680         int r;
1681         char *s;
1682
1683         assert(u);
1684         assert(name || path);
1685
1686         if (!(name = resolve_template(u, name, path, &s)))
1687                 return -ENOMEM;
1688
1689         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1690                 goto finish;
1691
1692         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1693
1694 finish:
1695         free(s);
1696         return r;
1697 }
1698
1699 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1700         Unit *other;
1701         int r;
1702         char *s;
1703
1704         assert(u);
1705         assert(name || path);
1706
1707         if (!(name = resolve_template(u, name, path, &s)))
1708                 return -ENOMEM;
1709
1710         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1711                 goto finish;
1712
1713         r = unit_add_dependency(other, d, u, add_reference);
1714
1715 finish:
1716         free(s);
1717         return r;
1718 }
1719
1720 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1721         Unit *other;
1722         int r;
1723         char *s;
1724
1725         assert(u);
1726         assert(name || path);
1727
1728         if (!(name = resolve_template(u, name, path, &s)))
1729                 return -ENOMEM;
1730
1731         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1732                 goto finish;
1733
1734         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1735                 goto finish;
1736
1737 finish:
1738         free(s);
1739         return r;
1740 }
1741
1742 int set_unit_path(const char *p) {
1743         char *cwd, *c;
1744         int r;
1745
1746         /* This is mostly for debug purposes */
1747
1748         if (path_is_absolute(p)) {
1749                 if (!(c = strdup(p)))
1750                         return -ENOMEM;
1751         } else {
1752                 if (!(cwd = get_current_dir_name()))
1753                         return -errno;
1754
1755                 r = asprintf(&c, "%s/%s", cwd, p);
1756                 free(cwd);
1757
1758                 if (r < 0)
1759                         return -ENOMEM;
1760         }
1761
1762         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1763                 r = -errno;
1764                 free(c);
1765                 return r;
1766         }
1767
1768         return 0;
1769 }
1770
1771 char *unit_dbus_path(Unit *u) {
1772         char *p, *e;
1773
1774         assert(u);
1775
1776         if (!u->id)
1777                 return NULL;
1778
1779         if (!(e = bus_path_escape(u->id)))
1780                 return NULL;
1781
1782         p = strappend("/org/freedesktop/systemd1/unit/", e);
1783         free(e);
1784
1785         return p;
1786 }
1787
1788 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1789         int r;
1790
1791         assert(u);
1792         assert(b);
1793
1794         assert(b->path);
1795
1796         if (!b->controller) {
1797                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1798                         return -ENOMEM;
1799
1800                 b->ours = true;
1801         }
1802
1803         /* Ensure this hasn't been added yet */
1804         assert(!b->unit);
1805
1806         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1807                 CGroupBonding *l;
1808
1809                 l = hashmap_get(u->manager->cgroup_bondings, b->path);
1810                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1811
1812                 if ((r = hashmap_replace(u->manager->cgroup_bondings, b->path, l)) < 0) {
1813                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1814                         return r;
1815                 }
1816         }
1817
1818         LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b);
1819         b->unit = u;
1820
1821         return 0;
1822 }
1823
1824 static char *default_cgroup_path(Unit *u) {
1825         char *p;
1826
1827         assert(u);
1828
1829         if (u->instance) {
1830                 char *t;
1831
1832                 t = unit_name_template(u->id);
1833                 if (!t)
1834                         return NULL;
1835
1836                 p = join(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL);
1837                 free(t);
1838         } else
1839                 p = join(u->manager->cgroup_hierarchy, "/", u->id, NULL);
1840
1841         return p;
1842 }
1843
1844 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1845         char *controller = NULL, *path = NULL;
1846         CGroupBonding *b = NULL;
1847         bool ours = false;
1848         int r;
1849
1850         assert(u);
1851         assert(name);
1852
1853         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1854                 return r;
1855
1856         if (!path) {
1857                 path = default_cgroup_path(u);
1858                 ours = true;
1859         }
1860
1861         if (!controller) {
1862                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1863                 ours = true;
1864         }
1865
1866         if (!path || !controller) {
1867                 free(path);
1868                 free(controller);
1869
1870                 return -ENOMEM;
1871         }
1872
1873         if (cgroup_bonding_find_list(u->cgroup_bondings, controller)) {
1874                 r = -EEXIST;
1875                 goto fail;
1876         }
1877
1878         if (!(b = new0(CGroupBonding, 1))) {
1879                 r = -ENOMEM;
1880                 goto fail;
1881         }
1882
1883         b->controller = controller;
1884         b->path = path;
1885         b->ours = ours;
1886         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1887
1888         if ((r = unit_add_cgroup(u, b)) < 0)
1889                 goto fail;
1890
1891         return 0;
1892
1893 fail:
1894         free(path);
1895         free(controller);
1896         free(b);
1897
1898         return r;
1899 }
1900
1901 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1902         CGroupBonding *b = NULL;
1903         int r = -ENOMEM;
1904
1905         assert(u);
1906
1907         if (!controller)
1908                 controller = SYSTEMD_CGROUP_CONTROLLER;
1909
1910         if (cgroup_bonding_find_list(u->cgroup_bondings, controller))
1911                 return 0;
1912
1913         if (!(b = new0(CGroupBonding, 1)))
1914                 return -ENOMEM;
1915
1916         if (!(b->controller = strdup(controller)))
1917                 goto fail;
1918
1919         if (!(b->path = default_cgroup_path(u)))
1920                 goto fail;
1921
1922         b->ours = true;
1923         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1924
1925         if ((r = unit_add_cgroup(u, b)) < 0)
1926                 goto fail;
1927
1928         return 0;
1929
1930 fail:
1931         free(b->path);
1932         free(b->controller);
1933         free(b);
1934
1935         return r;
1936 }
1937
1938 int unit_add_default_cgroups(Unit *u) {
1939         CGroupAttribute *a;
1940         char **c;
1941         int r;
1942
1943         assert(u);
1944
1945         /* Adds in the default cgroups, if they weren't specified
1946          * otherwise. */
1947
1948         if (!u->manager->cgroup_hierarchy)
1949                 return 0;
1950
1951         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1952                 return r;
1953
1954         STRV_FOREACH(c, u->manager->default_controllers)
1955                 unit_add_one_default_cgroup(u, *c);
1956
1957         LIST_FOREACH(by_unit, a, u->cgroup_attributes)
1958                 unit_add_one_default_cgroup(u, a->controller);
1959
1960         return 0;
1961 }
1962
1963 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1964         assert(u);
1965
1966         return cgroup_bonding_find_list(u->cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1967 }
1968
1969 int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback) {
1970         int r;
1971         char *c = NULL;
1972         CGroupAttribute *a;
1973
1974         assert(u);
1975         assert(name);
1976         assert(value);
1977
1978         if (!controller) {
1979                 const char *dot;
1980
1981                 dot = strchr(name, '.');
1982                 if (!dot)
1983                         return -EINVAL;
1984
1985                 c = strndup(name, dot - name);
1986                 if (!c)
1987                         return -ENOMEM;
1988
1989                 controller = c;
1990         }
1991
1992         if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
1993                 r = -EINVAL;
1994                 goto finish;
1995         }
1996
1997         a = new0(CGroupAttribute, 1);
1998         if (!a) {
1999                 r = -ENOMEM;
2000                 goto finish;
2001         }
2002
2003         if (c) {
2004                 a->controller = c;
2005                 c = NULL;
2006         } else
2007                 a->controller = strdup(controller);
2008
2009         a->name = strdup(name);
2010         a->value = strdup(value);
2011
2012         if (!a->controller || !a->name || !a->value) {
2013                 free(a->controller);
2014                 free(a->name);
2015                 free(a->value);
2016                 free(a);
2017
2018                 return -ENOMEM;
2019         }
2020
2021         a->map_callback = map_callback;
2022
2023         LIST_PREPEND(CGroupAttribute, by_unit, u->cgroup_attributes, a);
2024
2025         r = 0;
2026
2027 finish:
2028         free(c);
2029         return r;
2030 }
2031
2032 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2033         char *t;
2034         int r;
2035
2036         assert(u);
2037         assert(type);
2038         assert(_found);
2039
2040         if (!(t = unit_name_change_suffix(u->id, type)))
2041                 return -ENOMEM;
2042
2043         assert(!unit_has_name(u, t));
2044
2045         r = manager_load_unit(u->manager, t, NULL, NULL, _found);
2046         free(t);
2047
2048         assert(r < 0 || *_found != u);
2049
2050         return r;
2051 }
2052
2053 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2054         Unit *found;
2055         char *t;
2056
2057         assert(u);
2058         assert(type);
2059         assert(_found);
2060
2061         if (!(t = unit_name_change_suffix(u->id, type)))
2062                 return -ENOMEM;
2063
2064         assert(!unit_has_name(u, t));
2065
2066         found = manager_get_unit(u->manager, t);
2067         free(t);
2068
2069         if (!found)
2070                 return -ENOENT;
2071
2072         *_found = found;
2073         return 0;
2074 }
2075
2076 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
2077         Unit *u = userdata;
2078         assert(u);
2079
2080         return unit_name_to_prefix_and_instance(u->id);
2081 }
2082
2083 static char *specifier_prefix(char specifier, void *data, void *userdata) {
2084         Unit *u = userdata;
2085         assert(u);
2086
2087         return unit_name_to_prefix(u->id);
2088 }
2089
2090 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
2091         Unit *u = userdata;
2092         char *p, *r;
2093
2094         assert(u);
2095
2096         if (!(p = unit_name_to_prefix(u->id)))
2097                 return NULL;
2098
2099         r = unit_name_unescape(p);
2100         free(p);
2101
2102         return r;
2103 }
2104
2105 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
2106         Unit *u = userdata;
2107         assert(u);
2108
2109         if (u->instance)
2110                 return unit_name_unescape(u->instance);
2111
2112         return strdup("");
2113 }
2114
2115 static char *specifier_filename(char specifier, void *data, void *userdata) {
2116         Unit *u = userdata;
2117         assert(u);
2118
2119         if (u->instance)
2120                 return unit_name_path_unescape(u->instance);
2121
2122         return unit_name_to_path(u->instance);
2123 }
2124
2125 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2126         Unit *u = userdata;
2127         assert(u);
2128
2129         return default_cgroup_path(u);
2130 }
2131
2132 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2133         Unit *u = userdata;
2134         char *p;
2135         assert(u);
2136
2137         if (specifier == 'r')
2138                 return strdup(u->manager->cgroup_hierarchy);
2139
2140         if (parent_of_path(u->manager->cgroup_hierarchy, &p) < 0)
2141                 return strdup("");
2142
2143         if (streq(p, "/")) {
2144                 free(p);
2145                 return strdup("");
2146         }
2147
2148         return p;
2149 }
2150
2151 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2152         Unit *u = userdata;
2153         assert(u);
2154
2155         if (u->manager->running_as == MANAGER_USER) {
2156                 const char *e;
2157
2158                 e = getenv("XDG_RUNTIME_DIR");
2159                 if (e)
2160                         return strdup(e);
2161         }
2162
2163         return strdup("/run");
2164 }
2165
2166 char *unit_name_printf(Unit *u, const char* format) {
2167
2168         /*
2169          * This will use the passed string as format string and
2170          * replace the following specifiers:
2171          *
2172          * %n: the full id of the unit                 (foo@bar.waldo)
2173          * %N: the id of the unit without the suffix   (foo@bar)
2174          * %p: the prefix                              (foo)
2175          * %i: the instance                            (bar)
2176          */
2177
2178         const Specifier table[] = {
2179                 { 'n', specifier_string,              u->id },
2180                 { 'N', specifier_prefix_and_instance, NULL },
2181                 { 'p', specifier_prefix,              NULL },
2182                 { 'i', specifier_string,              u->instance },
2183                 { 0, NULL, NULL }
2184         };
2185
2186         assert(u);
2187         assert(format);
2188
2189         return specifier_printf(format, table, u);
2190 }
2191
2192 char *unit_full_printf(Unit *u, const char *format) {
2193
2194         /* This is similar to unit_name_printf() but also supports
2195          * unescaping. Also, adds a couple of additional codes:
2196          *
2197          * %c cgroup path of unit
2198          * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2199          * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2200          * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2201          */
2202
2203         const Specifier table[] = {
2204                 { 'n', specifier_string,              u->id },
2205                 { 'N', specifier_prefix_and_instance, NULL },
2206                 { 'p', specifier_prefix,              NULL },
2207                 { 'P', specifier_prefix_unescaped,    NULL },
2208                 { 'i', specifier_string,              u->instance },
2209                 { 'I', specifier_instance_unescaped,  NULL },
2210                 { 'f', specifier_filename,            NULL },
2211                 { 'c', specifier_cgroup,              NULL },
2212                 { 'r', specifier_cgroup_root,         NULL },
2213                 { 'R', specifier_cgroup_root,         NULL },
2214                 { 't', specifier_runtime,             NULL },
2215                 { 0, NULL, NULL }
2216         };
2217
2218         assert(u);
2219         assert(format);
2220
2221         return specifier_printf(format, table, u);
2222 }
2223
2224 char **unit_full_printf_strv(Unit *u, char **l) {
2225         size_t n;
2226         char **r, **i, **j;
2227
2228         /* Applies unit_full_printf to every entry in l */
2229
2230         assert(u);
2231
2232         n = strv_length(l);
2233         if (!(r = new(char*, n+1)))
2234                 return NULL;
2235
2236         for (i = l, j = r; *i; i++, j++)
2237                 if (!(*j = unit_full_printf(u, *i)))
2238                         goto fail;
2239
2240         *j = NULL;
2241         return r;
2242
2243 fail:
2244         for (j--; j >= r; j--)
2245                 free(*j);
2246
2247         free(r);
2248
2249         return NULL;
2250 }
2251
2252 int unit_watch_bus_name(Unit *u, const char *name) {
2253         assert(u);
2254         assert(name);
2255
2256         /* Watch a specific name on the bus. We only support one unit
2257          * watching each name for now. */
2258
2259         return hashmap_put(u->manager->watch_bus, name, u);
2260 }
2261
2262 void unit_unwatch_bus_name(Unit *u, const char *name) {
2263         assert(u);
2264         assert(name);
2265
2266         hashmap_remove_value(u->manager->watch_bus, name, u);
2267 }
2268
2269 bool unit_can_serialize(Unit *u) {
2270         assert(u);
2271
2272         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2273 }
2274
2275 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2276         int r;
2277
2278         assert(u);
2279         assert(f);
2280         assert(fds);
2281
2282         if (!unit_can_serialize(u))
2283                 return 0;
2284
2285         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2286                 return r;
2287
2288         if (u->job)
2289                 unit_serialize_item(u, f, "job", job_type_to_string(u->job->type));
2290
2291         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);
2292         dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);
2293         dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);
2294         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);
2295         dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);
2296
2297         if (dual_timestamp_is_set(&u->condition_timestamp))
2298                 unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));
2299
2300         /* End marker */
2301         fputc('\n', f);
2302         return 0;
2303 }
2304
2305 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2306         va_list ap;
2307
2308         assert(u);
2309         assert(f);
2310         assert(key);
2311         assert(format);
2312
2313         fputs(key, f);
2314         fputc('=', f);
2315
2316         va_start(ap, format);
2317         vfprintf(f, format, ap);
2318         va_end(ap);
2319
2320         fputc('\n', f);
2321 }
2322
2323 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2324         assert(u);
2325         assert(f);
2326         assert(key);
2327         assert(value);
2328
2329         fprintf(f, "%s=%s\n", key, value);
2330 }
2331
2332 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2333         int r;
2334
2335         assert(u);
2336         assert(f);
2337         assert(fds);
2338
2339         if (!unit_can_serialize(u))
2340                 return 0;
2341
2342         for (;;) {
2343                 char line[LINE_MAX], *l, *v;
2344                 size_t k;
2345
2346                 if (!fgets(line, sizeof(line), f)) {
2347                         if (feof(f))
2348                                 return 0;
2349                         return -errno;
2350                 }
2351
2352                 char_array_0(line);
2353                 l = strstrip(line);
2354
2355                 /* End marker */
2356                 if (l[0] == 0)
2357                         return 0;
2358
2359                 k = strcspn(l, "=");
2360
2361                 if (l[k] == '=') {
2362                         l[k] = 0;
2363                         v = l+k+1;
2364                 } else
2365                         v = l+k;
2366
2367                 if (streq(l, "job")) {
2368                         JobType type;
2369
2370                         if ((type = job_type_from_string(v)) < 0)
2371                                 log_debug("Failed to parse job type value %s", v);
2372                         else
2373                                 u->deserialized_job = type;
2374
2375                         continue;
2376                 } else if (streq(l, "inactive-exit-timestamp")) {
2377                         dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);
2378                         continue;
2379                 } else if (streq(l, "active-enter-timestamp")) {
2380                         dual_timestamp_deserialize(v, &u->active_enter_timestamp);
2381                         continue;
2382                 } else if (streq(l, "active-exit-timestamp")) {
2383                         dual_timestamp_deserialize(v, &u->active_exit_timestamp);
2384                         continue;
2385                 } else if (streq(l, "inactive-enter-timestamp")) {
2386                         dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);
2387                         continue;
2388                 } else if (streq(l, "condition-timestamp")) {
2389                         dual_timestamp_deserialize(v, &u->condition_timestamp);
2390                         continue;
2391                 } else if (streq(l, "condition-result")) {
2392                         int b;
2393
2394                         if ((b = parse_boolean(v)) < 0)
2395                                 log_debug("Failed to parse condition result value %s", v);
2396                         else
2397                                 u->condition_result = b;
2398
2399                         continue;
2400                 }
2401
2402                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2403                         return r;
2404         }
2405 }
2406
2407 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2408         Unit *device;
2409         char *e;
2410         int r;
2411
2412         assert(u);
2413
2414         if (!what)
2415                 return 0;
2416
2417         /* Adds in links to the device node that this unit is based on */
2418
2419         if (!is_device_path(what))
2420                 return 0;
2421
2422         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2423                 return -ENOMEM;
2424
2425         r = manager_load_unit(u->manager, e, NULL, NULL, &device);
2426         free(e);
2427
2428         if (r < 0)
2429                 return r;
2430
2431         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2432                 return r;
2433
2434         if (wants)
2435                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2436                         return r;
2437
2438         return 0;
2439 }
2440
2441 int unit_coldplug(Unit *u) {
2442         int r;
2443
2444         assert(u);
2445
2446         if (UNIT_VTABLE(u)->coldplug)
2447                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2448                         return r;
2449
2450         if (u->deserialized_job >= 0) {
2451                 if ((r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2452                         return r;
2453
2454                 u->deserialized_job = _JOB_TYPE_INVALID;
2455         }
2456
2457         return 0;
2458 }
2459
2460 void unit_status_printf(Unit *u, const char *status, const char *format, ...) {
2461         va_list ap;
2462
2463         assert(u);
2464         assert(format);
2465
2466         if (!UNIT_VTABLE(u)->show_status)
2467                 return;
2468
2469         if (!manager_get_show_status(u->manager))
2470                 return;
2471
2472         if (!manager_is_booting_or_shutting_down(u->manager))
2473                 return;
2474
2475         va_start(ap, format);
2476         status_vprintf(status, true, format, ap);
2477         va_end(ap);
2478 }
2479
2480 bool unit_need_daemon_reload(Unit *u) {
2481         assert(u);
2482
2483         if (u->fragment_path) {
2484                 struct stat st;
2485
2486                 zero(st);
2487                 if (stat(u->fragment_path, &st) < 0)
2488                         /* What, cannot access this anymore? */
2489                         return true;
2490
2491                 if (u->fragment_mtime > 0 &&
2492                     timespec_load(&st.st_mtim) != u->fragment_mtime)
2493                         return true;
2494         }
2495
2496         if (UNIT_VTABLE(u)->need_daemon_reload)
2497                 return UNIT_VTABLE(u)->need_daemon_reload(u);
2498
2499         return false;
2500 }
2501
2502 void unit_reset_failed(Unit *u) {
2503         assert(u);
2504
2505         if (UNIT_VTABLE(u)->reset_failed)
2506                 UNIT_VTABLE(u)->reset_failed(u);
2507 }
2508
2509 Unit *unit_following(Unit *u) {
2510         assert(u);
2511
2512         if (UNIT_VTABLE(u)->following)
2513                 return UNIT_VTABLE(u)->following(u);
2514
2515         return NULL;
2516 }
2517
2518 bool unit_pending_inactive(Unit *u) {
2519         assert(u);
2520
2521         /* Returns true if the unit is inactive or going down */
2522
2523         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2524                 return true;
2525
2526         if (u->job && u->job->type == JOB_STOP)
2527                 return true;
2528
2529         return false;
2530 }
2531
2532 bool unit_pending_active(Unit *u) {
2533         assert(u);
2534
2535         /* Returns true if the unit is active or going up */
2536
2537         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2538                 return true;
2539
2540         if (u->job &&
2541             (u->job->type == JOB_START ||
2542              u->job->type == JOB_RELOAD_OR_START ||
2543              u->job->type == JOB_RESTART))
2544                 return true;
2545
2546         return false;
2547 }
2548
2549 UnitType unit_name_to_type(const char *n) {
2550         UnitType t;
2551
2552         assert(n);
2553
2554         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2555                 if (endswith(n, unit_vtable[t]->suffix))
2556                         return t;
2557
2558         return _UNIT_TYPE_INVALID;
2559 }
2560
2561 bool unit_name_is_valid(const char *n, bool template_ok) {
2562         UnitType t;
2563
2564         t = unit_name_to_type(n);
2565         if (t < 0 || t >= _UNIT_TYPE_MAX)
2566                 return false;
2567
2568         return unit_name_is_valid_no_type(n, template_ok);
2569 }
2570
2571 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2572         assert(u);
2573         assert(w >= 0 && w < _KILL_WHO_MAX);
2574         assert(m >= 0 && m < _KILL_MODE_MAX);
2575         assert(signo > 0);
2576         assert(signo < _NSIG);
2577
2578         if (m == KILL_NONE)
2579                 return 0;
2580
2581         if (!UNIT_VTABLE(u)->kill)
2582                 return -ENOTSUP;
2583
2584         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2585 }
2586
2587 int unit_following_set(Unit *u, Set **s) {
2588         assert(u);
2589         assert(s);
2590
2591         if (UNIT_VTABLE(u)->following_set)
2592                 return UNIT_VTABLE(u)->following_set(u, s);
2593
2594         *s = NULL;
2595         return 0;
2596 }
2597
2598 UnitFileState unit_get_unit_file_state(Unit *u) {
2599         assert(u);
2600
2601         if (u->unit_file_state < 0 && u->fragment_path)
2602                 u->unit_file_state = unit_file_get_state(
2603                                 u->manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2604                                 NULL, file_name_from_path(u->fragment_path));
2605
2606         return u->unit_file_state;
2607 }
2608
2609 Unit* unit_ref_set(UnitRef *ref, Unit *u) {
2610         assert(ref);
2611         assert(u);
2612
2613         if (ref->unit)
2614                 unit_ref_unset(ref);
2615
2616         ref->unit = u;
2617         LIST_PREPEND(UnitRef, refs, u->refs, ref);
2618         return u;
2619 }
2620
2621 void unit_ref_unset(UnitRef *ref) {
2622         assert(ref);
2623
2624         if (!ref->unit)
2625                 return;
2626
2627         LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref);
2628         ref->unit = NULL;
2629 }
2630
2631 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2632         [UNIT_STUB] = "stub",
2633         [UNIT_LOADED] = "loaded",
2634         [UNIT_ERROR] = "error",
2635         [UNIT_MERGED] = "merged",
2636         [UNIT_MASKED] = "masked"
2637 };
2638
2639 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2640
2641 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2642         [UNIT_ACTIVE] = "active",
2643         [UNIT_RELOADING] = "reloading",
2644         [UNIT_INACTIVE] = "inactive",
2645         [UNIT_FAILED] = "failed",
2646         [UNIT_ACTIVATING] = "activating",
2647         [UNIT_DEACTIVATING] = "deactivating"
2648 };
2649
2650 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2651
2652 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2653         [UNIT_REQUIRES] = "Requires",
2654         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2655         [UNIT_WANTS] = "Wants",
2656         [UNIT_REQUISITE] = "Requisite",
2657         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2658         [UNIT_REQUIRED_BY] = "RequiredBy",
2659         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2660         [UNIT_BIND_TO] = "BindTo",
2661         [UNIT_WANTED_BY] = "WantedBy",
2662         [UNIT_CONFLICTS] = "Conflicts",
2663         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2664         [UNIT_BOUND_BY] = "BoundBy",
2665         [UNIT_BEFORE] = "Before",
2666         [UNIT_AFTER] = "After",
2667         [UNIT_REFERENCES] = "References",
2668         [UNIT_REFERENCED_BY] = "ReferencedBy",
2669         [UNIT_ON_FAILURE] = "OnFailure",
2670         [UNIT_TRIGGERS] = "Triggers",
2671         [UNIT_TRIGGERED_BY] = "TriggeredBy",
2672         [UNIT_PROPAGATE_RELOAD_TO] = "PropagateReloadTo",
2673         [UNIT_PROPAGATE_RELOAD_FROM] = "PropagateReloadFrom"
2674 };
2675
2676 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);