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