src/unit.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44 #include "missing.h"
  45
  46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  47         [UNIT_SERVICE] = &service_vtable,
  48         [UNIT_TIMER] = &timer_vtable,
  49         [UNIT_SOCKET] = &socket_vtable,
  50         [UNIT_TARGET] = &target_vtable,
  51         [UNIT_DEVICE] = &device_vtable,
  52         [UNIT_MOUNT] = &mount_vtable,
  53         [UNIT_AUTOMOUNT] = &automount_vtable,
  54         [UNIT_SNAPSHOT] = &snapshot_vtable,
  55         [UNIT_SWAP] = &swap_vtable,
  56         [UNIT_PATH] = &path_vtable
  57 };
  58
  59 Unit *unit_new(Manager *m) {
  60         Unit *u;
  61
  62         assert(m);
  63
  64         if (!(u = new0(Unit, 1)))
  65                 return NULL;
  66
  67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  68                 free(u);
  69                 return NULL;
  70         }
  71
  72         u->meta.manager = m;
  73         u->meta.type = _UNIT_TYPE_INVALID;
  74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  75         u->meta.default_dependencies = true;
  76
  77         return u;
  78 }
  79
  80 bool unit_has_name(Unit *u, const char *name) {
  81         assert(u);
  82         assert(name);
  83
  84         return !!set_get(u->meta.names, (char*) name);
  85 }
  86
  87 int unit_add_name(Unit *u, const char *text) {
  88         UnitType t;
  89         char *s, *i = NULL;
  90         int r;
  91
  92         assert(u);
  93         assert(text);
  94
  95         if (unit_name_is_template(text)) {
  96                 if (!u->meta.instance)
  97                         return -EINVAL;
  98
  99                 s = unit_name_replace_instance(text, u->meta.instance);
 100         } else
 101                 s = strdup(text);
 102
 103         if (!s)
 104                 return -ENOMEM;
 105
 106         if (!unit_name_is_valid(s, false)) {
 107                 r = -EINVAL;
 108                 goto fail;
 109         }
 110
 111         assert_se((t = unit_name_to_type(s)) >= 0);
 112
 113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 114                 r = -EINVAL;
 115                 goto fail;
 116         }
 117
 118         if ((r = unit_name_to_instance(s, &i)) < 0)
 119                 goto fail;
 120
 121         if (i && unit_vtable[t]->no_instances) {
 122                 r = -EINVAL;
 123                 goto fail;
 124         }
 125
 126         /* Ensure that this unit is either instanced or not instanced,
 127          * but not both. */
 128         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 129                 r = -EINVAL;
 130                 goto fail;
 131         }
 132
 133         if (unit_vtable[t]->no_alias &&
 134             !set_isempty(u->meta.names) &&
 135             !set_get(u->meta.names, s)) {
 136                 r = -EEXIST;
 137                 goto fail;
 138         }
 139
 140         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 141                 r = -E2BIG;
 142                 goto fail;
 143         }
 144
 145         if ((r = set_put(u->meta.names, s)) < 0) {
 146                 if (r == -EEXIST)
 147                         r = 0;
 148                 goto fail;
 149         }
 150
 151         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 152                 set_remove(u->meta.names, s);
 153                 goto fail;
 154         }
 155
 156         if (u->meta.type == _UNIT_TYPE_INVALID) {
 157
 158                 u->meta.type = t;
 159                 u->meta.id = s;
 160                 u->meta.instance = i;
 161
 162                 LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
 163
 164                 if (UNIT_VTABLE(u)->init)
 165                         UNIT_VTABLE(u)->init(u);
 166         } else
 167                 free(i);
 168
 169         unit_add_to_dbus_queue(u);
 170         return 0;
 171
 172 fail:
 173         free(s);
 174         free(i);
 175
 176         return r;
 177 }
 178
 179 int unit_choose_id(Unit *u, const char *name) {
 180         char *s, *t = NULL, *i;
 181         int r;
 182
 183         assert(u);
 184         assert(name);
 185
 186         if (unit_name_is_template(name)) {
 187
 188                 if (!u->meta.instance)
 189                         return -EINVAL;
 190
 191                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 192                         return -ENOMEM;
 193
 194                 name = t;
 195         }
 196
 197         /* Selects one of the names of this unit as the id */
 198         s = set_get(u->meta.names, (char*) name);
 199         free(t);
 200
 201         if (!s)
 202                 return -ENOENT;
 203
 204         if ((r = unit_name_to_instance(s, &i)) < 0)
 205                 return r;
 206
 207         u->meta.id = s;
 208
 209         free(u->meta.instance);
 210         u->meta.instance = i;
 211
 212         unit_add_to_dbus_queue(u);
 213
 214         return 0;
 215 }
 216
 217 int unit_set_description(Unit *u, const char *description) {
 218         char *s;
 219
 220         assert(u);
 221
 222         if (!(s = strdup(description)))
 223                 return -ENOMEM;
 224
 225         free(u->meta.description);
 226         u->meta.description = s;
 227
 228         unit_add_to_dbus_queue(u);
 229         return 0;
 230 }
 231
 232 bool unit_check_gc(Unit *u) {
 233         assert(u);
 234
 235         if (u->meta.load_state == UNIT_STUB)
 236                 return true;
 237
 238         if (UNIT_VTABLE(u)->no_gc)
 239                 return true;
 240
 241         if (u->meta.no_gc)
 242                 return true;
 243
 244         if (u->meta.job)
 245                 return true;
 246
 247         if (unit_active_state(u) != UNIT_INACTIVE)
 248                 return true;
 249
 250         if (UNIT_VTABLE(u)->check_gc)
 251                 if (UNIT_VTABLE(u)->check_gc(u))
 252                         return true;
 253
 254         return false;
 255 }
 256
 257 void unit_add_to_load_queue(Unit *u) {
 258         assert(u);
 259         assert(u->meta.type != _UNIT_TYPE_INVALID);
 260
 261         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 262                 return;
 263
 264         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 265         u->meta.in_load_queue = true;
 266 }
 267
 268 void unit_add_to_cleanup_queue(Unit *u) {
 269         assert(u);
 270
 271         if (u->meta.in_cleanup_queue)
 272                 return;
 273
 274         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 275         u->meta.in_cleanup_queue = true;
 276 }
 277
 278 void unit_add_to_gc_queue(Unit *u) {
 279         assert(u);
 280
 281         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 282                 return;
 283
 284         if (unit_check_gc(u))
 285                 return;
 286
 287         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 288         u->meta.in_gc_queue = true;
 289
 290         u->meta.manager->n_in_gc_queue ++;
 291
 292         if (u->meta.manager->gc_queue_timestamp <= 0)
 293                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 294 }
 295
 296 void unit_add_to_dbus_queue(Unit *u) {
 297         assert(u);
 298         assert(u->meta.type != _UNIT_TYPE_INVALID);
 299
 300         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 301                 return;
 302
 303         /* Shortcut things if nobody cares */
 304         if (!bus_has_subscriber(u->meta.manager)) {
 305                 u->meta.sent_dbus_new_signal = true;
 306                 return;
 307         }
 308
 309         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 310         u->meta.in_dbus_queue = true;
 311 }
 312
 313 static void bidi_set_free(Unit *u, Set *s) {
 314         Iterator i;
 315         Unit *other;
 316
 317         assert(u);
 318
 319         /* Frees the set and makes sure we are dropped from the
 320          * inverse pointers */
 321
 322         SET_FOREACH(other, s, i) {
 323                 UnitDependency d;
 324
 325                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 326                         set_remove(other->meta.dependencies[d], u);
 327
 328                 unit_add_to_gc_queue(other);
 329         }
 330
 331         set_free(s);
 332 }
 333
 334 void unit_free(Unit *u) {
 335         UnitDependency d;
 336         Iterator i;
 337         char *t;
 338
 339         assert(u);
 340
 341         bus_unit_send_removed_signal(u);
 342
 343         if (u->meta.load_state != UNIT_STUB)
 344                 if (UNIT_VTABLE(u)->done)
 345                         UNIT_VTABLE(u)->done(u);
 346
 347         SET_FOREACH(t, u->meta.names, i)
 348                 hashmap_remove_value(u->meta.manager->units, t, u);
 349
 350         if (u->meta.job)
 351                 job_free(u->meta.job);
 352
 353         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 354                 bidi_set_free(u, u->meta.dependencies[d]);
 355
 356         if (u->meta.type != _UNIT_TYPE_INVALID)
 357                 LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
 358
 359         if (u->meta.in_load_queue)
 360                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 361
 362         if (u->meta.in_dbus_queue)
 363                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 364
 365         if (u->meta.in_cleanup_queue)
 366                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 367
 368         if (u->meta.in_gc_queue) {
 369                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 370                 u->meta.manager->n_in_gc_queue--;
 371         }
 372
 373         cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_reloading <= 0);
 374
 375         free(u->meta.description);
 376         free(u->meta.fragment_path);
 377
 378         set_free_free(u->meta.names);
 379
 380         condition_free_list(u->meta.conditions);
 381
 382         free(u->meta.instance);
 383         free(u);
 384 }
 385
 386 UnitActiveState unit_active_state(Unit *u) {
 387         assert(u);
 388
 389         if (u->meta.load_state == UNIT_MERGED)
 390                 return unit_active_state(unit_follow_merge(u));
 391
 392         /* After a reload it might happen that a unit is not correctly
 393          * loaded but still has a process around. That's why we won't
 394          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 395
 396         return UNIT_VTABLE(u)->active_state(u);
 397 }
 398
 399 const char* unit_sub_state_to_string(Unit *u) {
 400         assert(u);
 401
 402         return UNIT_VTABLE(u)->sub_state_to_string(u);
 403 }
 404
 405 static void complete_move(Set **s, Set **other) {
 406         assert(s);
 407         assert(other);
 408
 409         if (!*other)
 410                 return;
 411
 412         if (*s)
 413                 set_move(*s, *other);
 414         else {
 415                 *s = *other;
 416                 *other = NULL;
 417         }
 418 }
 419
 420 static void merge_names(Unit *u, Unit *other) {
 421         char *t;
 422         Iterator i;
 423
 424         assert(u);
 425         assert(other);
 426
 427         complete_move(&u->meta.names, &other->meta.names);
 428
 429         set_free_free(other->meta.names);
 430         other->meta.names = NULL;
 431         other->meta.id = NULL;
 432
 433         SET_FOREACH(t, u->meta.names, i)
 434                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 435 }
 436
 437 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 438         Iterator i;
 439         Unit *back;
 440         int r;
 441
 442         assert(u);
 443         assert(other);
 444         assert(d < _UNIT_DEPENDENCY_MAX);
 445
 446         /* Fix backwards pointers */
 447         SET_FOREACH(back, other->meta.dependencies[d], i) {
 448                 UnitDependency k;
 449
 450                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 451                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 452
 453                                 if (r == -EEXIST)
 454                                         set_remove(back->meta.dependencies[k], other);
 455                                 else
 456                                         assert(r == -ENOENT);
 457                         }
 458         }
 459
 460         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 461
 462         set_free(other->meta.dependencies[d]);
 463         other->meta.dependencies[d] = NULL;
 464 }
 465
 466 int unit_merge(Unit *u, Unit *other) {
 467         UnitDependency d;
 468
 469         assert(u);
 470         assert(other);
 471         assert(u->meta.manager == other->meta.manager);
 472         assert(u->meta.type != _UNIT_TYPE_INVALID);
 473
 474         other = unit_follow_merge(other);
 475
 476         if (other == u)
 477                 return 0;
 478
 479         if (u->meta.type != other->meta.type)
 480                 return -EINVAL;
 481
 482         if (!u->meta.instance != !other->meta.instance)
 483                 return -EINVAL;
 484
 485         if (other->meta.load_state != UNIT_STUB &&
 486             other->meta.load_state != UNIT_ERROR)
 487                 return -EEXIST;
 488
 489         if (other->meta.job)
 490                 return -EEXIST;
 491
 492         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 493                 return -EEXIST;
 494
 495         /* Merge names */
 496         merge_names(u, other);
 497
 498         /* Merge dependencies */
 499         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 500                 merge_dependencies(u, other, d);
 501
 502         other->meta.load_state = UNIT_MERGED;
 503         other->meta.merged_into = u;
 504
 505         /* If there is still some data attached to the other node, we
 506          * don't need it anymore, and can free it. */
 507         if (other->meta.load_state != UNIT_STUB)
 508                 if (UNIT_VTABLE(other)->done)
 509                         UNIT_VTABLE(other)->done(other);
 510
 511         unit_add_to_dbus_queue(u);
 512         unit_add_to_cleanup_queue(other);
 513
 514         return 0;
 515 }
 516
 517 int unit_merge_by_name(Unit *u, const char *name) {
 518         Unit *other;
 519         int r;
 520         char *s = NULL;
 521
 522         assert(u);
 523         assert(name);
 524
 525         if (unit_name_is_template(name)) {
 526                 if (!u->meta.instance)
 527                         return -EINVAL;
 528
 529                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 530                         return -ENOMEM;
 531
 532                 name = s;
 533         }
 534
 535         if (!(other = manager_get_unit(u->meta.manager, name)))
 536                 r = unit_add_name(u, name);
 537         else
 538                 r = unit_merge(u, other);
 539
 540         free(s);
 541         return r;
 542 }
 543
 544 Unit* unit_follow_merge(Unit *u) {
 545         assert(u);
 546
 547         while (u->meta.load_state == UNIT_MERGED)
 548                 assert_se(u = u->meta.merged_into);
 549
 550         return u;
 551 }
 552
 553 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 554         int r;
 555
 556         assert(u);
 557         assert(c);
 558
 559         if (c->std_output != EXEC_OUTPUT_KMSG &&
 560             c->std_output != EXEC_OUTPUT_SYSLOG &&
 561             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 562             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 563             c->std_error != EXEC_OUTPUT_KMSG &&
 564             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 565             c->std_error != EXEC_OUTPUT_KMSG &&
 566             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 567                 return 0;
 568
 569         /* If syslog or kernel logging is requested, make sure our own
 570          * logging daemon is run first. */
 571
 572         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 573                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 574                         return r;
 575
 576         return 0;
 577 }
 578
 579 const char *unit_description(Unit *u) {
 580         assert(u);
 581
 582         if (u->meta.description)
 583                 return u->meta.description;
 584
 585         return strna(u->meta.id);
 586 }
 587
 588 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 589         char *t;
 590         UnitDependency d;
 591         Iterator i;
 592         char *p2;
 593         const char *prefix2;
 594         CGroupBonding *b;
 595         char
 596                 timestamp1[FORMAT_TIMESTAMP_MAX],
 597                 timestamp2[FORMAT_TIMESTAMP_MAX],
 598                 timestamp3[FORMAT_TIMESTAMP_MAX],
 599                 timestamp4[FORMAT_TIMESTAMP_MAX],
 600                 timespan[FORMAT_TIMESPAN_MAX];
 601         Unit *following;
 602
 603         assert(u);
 604         assert(u->meta.type >= 0);
 605
 606         if (!prefix)
 607                 prefix = "";
 608         p2 = strappend(prefix, "\t");
 609         prefix2 = p2 ? p2 : prefix;
 610
 611         fprintf(f,
 612                 "%s-> Unit %s:\n"
 613                 "%s\tDescription: %s\n"
 614                 "%s\tInstance: %s\n"
 615                 "%s\tUnit Load State: %s\n"
 616                 "%s\tUnit Active State: %s\n"
 617                 "%s\tInactive Exit Timestamp: %s\n"
 618                 "%s\tActive Enter Timestamp: %s\n"
 619                 "%s\tActive Exit Timestamp: %s\n"
 620                 "%s\tInactive Enter Timestamp: %s\n"
 621                 "%s\tGC Check Good: %s\n"
 622                 "%s\tNeed Daemon Reload: %s\n",
 623                 prefix, u->meta.id,
 624                 prefix, unit_description(u),
 625                 prefix, strna(u->meta.instance),
 626                 prefix, unit_load_state_to_string(u->meta.load_state),
 627                 prefix, unit_active_state_to_string(unit_active_state(u)),
 628                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 629                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 630                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 631                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 632                 prefix, yes_no(unit_check_gc(u)),
 633                 prefix, yes_no(unit_need_daemon_reload(u)));
 634
 635         SET_FOREACH(t, u->meta.names, i)
 636                 fprintf(f, "%s\tName: %s\n", prefix, t);
 637
 638         if ((following = unit_following(u)))
 639                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 640
 641         if (u->meta.fragment_path)
 642                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 643
 644         if (u->meta.job_timeout > 0)
 645                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 646
 647         condition_dump_list(u->meta.conditions, f, prefix);
 648
 649         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
 650                 fprintf(f,
 651                         "%s\tCondition Timestamp: %s\n"
 652                         "%s\tCondition Result: %s\n",
 653                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
 654                         prefix, yes_no(u->meta.condition_result));
 655
 656         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 657                 Unit *other;
 658
 659                 SET_FOREACH(other, u->meta.dependencies[d], i)
 660                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 661         }
 662
 663         if (u->meta.load_state == UNIT_LOADED) {
 664                 fprintf(f,
 665                         "%s\tStopWhenUnneeded: %s\n"
 666                         "%s\tRefuseManualStart: %s\n"
 667                         "%s\tRefuseManualStop: %s\n"
 668                         "%s\tDefaultDependencies: %s\n"
 669                         "%s\tOnFailureIsolate: %s\n"
 670                         "%s\tIgnoreOnIsolate: %s\n"
 671                         "%s\tIgnoreOnSnapshot: %s\n",
 672                         prefix, yes_no(u->meta.stop_when_unneeded),
 673                         prefix, yes_no(u->meta.refuse_manual_start),
 674                         prefix, yes_no(u->meta.refuse_manual_stop),
 675                         prefix, yes_no(u->meta.default_dependencies),
 676                         prefix, yes_no(u->meta.on_failure_isolate),
 677                         prefix, yes_no(u->meta.ignore_on_isolate),
 678                         prefix, yes_no(u->meta.ignore_on_snapshot));
 679
 680                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 681                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 682                                 prefix, b->controller, b->path);
 683
 684                 if (UNIT_VTABLE(u)->dump)
 685                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 686
 687         } else if (u->meta.load_state == UNIT_MERGED)
 688                 fprintf(f,
 689                         "%s\tMerged into: %s\n",
 690                         prefix, u->meta.merged_into->meta.id);
 691         else if (u->meta.load_state == UNIT_ERROR)
 692                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 693
 694
 695         if (u->meta.job)
 696                 job_dump(u->meta.job, f, prefix2);
 697
 698         free(p2);
 699 }
 700
 701 /* Common implementation for multiple backends */
 702 int unit_load_fragment_and_dropin(Unit *u) {
 703         int r;
 704
 705         assert(u);
 706
 707         /* Load a .service file */
 708         if ((r = unit_load_fragment(u)) < 0)
 709                 return r;
 710
 711         if (u->meta.load_state == UNIT_STUB)
 712                 return -ENOENT;
 713
 714         /* Load drop-in directory data */
 715         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 716                 return r;
 717
 718         return 0;
 719 }
 720
 721 /* Common implementation for multiple backends */
 722 int unit_load_fragment_and_dropin_optional(Unit *u) {
 723         int r;
 724
 725         assert(u);
 726
 727         /* Same as unit_load_fragment_and_dropin(), but whether
 728          * something can be loaded or not doesn't matter. */
 729
 730         /* Load a .service file */
 731         if ((r = unit_load_fragment(u)) < 0)
 732                 return r;
 733
 734         if (u->meta.load_state == UNIT_STUB)
 735                 u->meta.load_state = UNIT_LOADED;
 736
 737         /* Load drop-in directory data */
 738         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 739                 return r;
 740
 741         return 0;
 742 }
 743
 744 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 745         assert(u);
 746         assert(target);
 747
 748         if (target->meta.type != UNIT_TARGET)
 749                 return 0;
 750
 751         /* Only add the dependency if both units are loaded, so that
 752          * that loop check below is reliable */
 753         if (u->meta.load_state != UNIT_LOADED ||
 754             target->meta.load_state != UNIT_LOADED)
 755                 return 0;
 756
 757         /* If either side wants no automatic dependencies, then let's
 758          * skip this */
 759         if (!u->meta.default_dependencies ||
 760             target->meta.default_dependencies)
 761                 return 0;
 762
 763         /* Don't create loops */
 764         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 765                 return 0;
 766
 767         return unit_add_dependency(target, UNIT_AFTER, u, true);
 768 }
 769
 770 static int unit_add_default_dependencies(Unit *u) {
 771         static const UnitDependency deps[] = {
 772                 UNIT_REQUIRED_BY,
 773                 UNIT_REQUIRED_BY_OVERRIDABLE,
 774                 UNIT_WANTED_BY,
 775                 UNIT_BOUND_BY
 776         };
 777
 778         Unit *target;
 779         Iterator i;
 780         int r;
 781         unsigned k;
 782
 783         assert(u);
 784
 785         for (k = 0; k < ELEMENTSOF(deps); k++)
 786                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 787                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 788                                 return r;
 789
 790         return 0;
 791 }
 792
 793 int unit_load(Unit *u) {
 794         int r;
 795
 796         assert(u);
 797
 798         if (u->meta.in_load_queue) {
 799                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 800                 u->meta.in_load_queue = false;
 801         }
 802
 803         if (u->meta.type == _UNIT_TYPE_INVALID)
 804                 return -EINVAL;
 805
 806         if (u->meta.load_state != UNIT_STUB)
 807                 return 0;
 808
 809         if (UNIT_VTABLE(u)->load)
 810                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 811                         goto fail;
 812
 813         if (u->meta.load_state == UNIT_STUB) {
 814                 r = -ENOENT;
 815                 goto fail;
 816         }
 817
 818         if (u->meta.load_state == UNIT_LOADED &&
 819             u->meta.default_dependencies)
 820                 if ((r = unit_add_default_dependencies(u)) < 0)
 821                         goto fail;
 822
 823         if (u->meta.on_failure_isolate &&
 824             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
 825
 826                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 827                           u->meta.id);
 828
 829                 r = -EINVAL;
 830                 goto fail;
 831         }
 832
 833         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 834
 835         unit_add_to_dbus_queue(unit_follow_merge(u));
 836         unit_add_to_gc_queue(u);
 837
 838         return 0;
 839
 840 fail:
 841         u->meta.load_state = UNIT_ERROR;
 842         u->meta.load_error = r;
 843         unit_add_to_dbus_queue(u);
 844
 845         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 846
 847         return r;
 848 }
 849
 850 bool unit_condition_test(Unit *u) {
 851         assert(u);
 852
 853         dual_timestamp_get(&u->meta.condition_timestamp);
 854         u->meta.condition_result = condition_test_list(u->meta.conditions);
 855
 856         return u->meta.condition_result;
 857 }
 858
 859 /* Errors:
 860  *         -EBADR:     This unit type does not support starting.
 861  *         -EALREADY:  Unit is already started.
 862  *         -EAGAIN:    An operation is already in progress. Retry later.
 863  *         -ECANCELED: Too many requests for now.
 864  */
 865 int unit_start(Unit *u) {
 866         UnitActiveState state;
 867         Unit *following;
 868
 869         assert(u);
 870
 871         if (u->meta.load_state != UNIT_LOADED)
 872                 return -EINVAL;
 873
 874         /* If this is already (being) started, then this will
 875          * succeed. Note that this will even succeed if this unit is
 876          * not startable by the user. This is relied on to detect when
 877          * we need to wait for units and when waiting is finished. */
 878         state = unit_active_state(u);
 879         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 880                 return -EALREADY;
 881
 882         /* If the conditions failed, don't do anything at all */
 883         if (!unit_condition_test(u)) {
 884                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 885                 return -EALREADY;
 886         }
 887
 888         /* Forward to the main object, if we aren't it. */
 889         if ((following = unit_following(u))) {
 890                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 891                 return unit_start(following);
 892         }
 893
 894         /* If it is stopped, but we cannot start it, then fail */
 895         if (!UNIT_VTABLE(u)->start)
 896                 return -EBADR;
 897
 898         /* We don't suppress calls to ->start() here when we are
 899          * already starting, to allow this request to be used as a
 900          * "hurry up" call, for example when the unit is in some "auto
 901          * restart" state where it waits for a holdoff timer to elapse
 902          * before it will start again. */
 903
 904         unit_add_to_dbus_queue(u);
 905
 906         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 907         return UNIT_VTABLE(u)->start(u);
 908 }
 909
 910 bool unit_can_start(Unit *u) {
 911         assert(u);
 912
 913         return !!UNIT_VTABLE(u)->start;
 914 }
 915
 916 bool unit_can_isolate(Unit *u) {
 917         assert(u);
 918
 919         return unit_can_start(u) &&
 920                 u->meta.allow_isolate;
 921 }
 922
 923 /* Errors:
 924  *         -EBADR:    This unit type does not support stopping.
 925  *         -EALREADY: Unit is already stopped.
 926  *         -EAGAIN:   An operation is already in progress. Retry later.
 927  */
 928 int unit_stop(Unit *u) {
 929         UnitActiveState state;
 930         Unit *following;
 931
 932         assert(u);
 933
 934         state = unit_active_state(u);
 935         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 936                 return -EALREADY;
 937
 938         if ((following = unit_following(u))) {
 939                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 940                 return unit_stop(following);
 941         }
 942
 943         if (!UNIT_VTABLE(u)->stop)
 944                 return -EBADR;
 945
 946         unit_add_to_dbus_queue(u);
 947
 948         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 949         return UNIT_VTABLE(u)->stop(u);
 950 }
 951
 952 /* Errors:
 953  *         -EBADR:    This unit type does not support reloading.
 954  *         -ENOEXEC:  Unit is not started.
 955  *         -EAGAIN:   An operation is already in progress. Retry later.
 956  */
 957 int unit_reload(Unit *u) {
 958         UnitActiveState state;
 959         Unit *following;
 960
 961         assert(u);
 962
 963         if (u->meta.load_state != UNIT_LOADED)
 964                 return -EINVAL;
 965
 966         if (!unit_can_reload(u))
 967                 return -EBADR;
 968
 969         state = unit_active_state(u);
 970         if (state == UNIT_RELOADING)
 971                 return -EALREADY;
 972
 973         if (state != UNIT_ACTIVE)
 974                 return -ENOEXEC;
 975
 976         if ((following = unit_following(u))) {
 977                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
 978                 return unit_reload(following);
 979         }
 980
 981         unit_add_to_dbus_queue(u);
 982         return UNIT_VTABLE(u)->reload(u);
 983 }
 984
 985 bool unit_can_reload(Unit *u) {
 986         assert(u);
 987
 988         if (!UNIT_VTABLE(u)->reload)
 989                 return false;
 990
 991         if (!UNIT_VTABLE(u)->can_reload)
 992                 return true;
 993
 994         return UNIT_VTABLE(u)->can_reload(u);
 995 }
 996
 997 static void unit_check_unneeded(Unit *u) {
 998         Iterator i;
 999         Unit *other;
1000
1001         assert(u);
1002
1003         /* If this service shall be shut down when unneeded then do
1004          * so. */
1005
1006         if (!u->meta.stop_when_unneeded)
1007                 return;
1008
1009         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1010                 return;
1011
1012         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1013                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1014                         return;
1015
1016         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1017                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018                         return;
1019
1020         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1021                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1022                         return;
1023
1024         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1025                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1026                         return;
1027
1028         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1029
1030         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1031         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1032 }
1033
1034 static void retroactively_start_dependencies(Unit *u) {
1035         Iterator i;
1036         Unit *other;
1037
1038         assert(u);
1039         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1040
1041         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1042                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1043                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1044                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1045
1046         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1047                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1048                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1049                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1050
1051         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1052                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1053                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1054                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1055
1056         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1057                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1058                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1059                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1060
1061         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1062                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1063                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1064                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1065
1066         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1067                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1068                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1069
1070         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1071                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1072                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1073 }
1074
1075 static void retroactively_stop_dependencies(Unit *u) {
1076         Iterator i;
1077         Unit *other;
1078
1079         assert(u);
1080         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1081
1082         /* Pull down units which are bound to us recursively if enabled */
1083         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1084                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1085                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1086
1087         /* Garbage collect services that might not be needed anymore, if enabled */
1088         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1089                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1090                         unit_check_unneeded(other);
1091         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1092                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1093                         unit_check_unneeded(other);
1094         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1095                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1096                         unit_check_unneeded(other);
1097         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1098                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1099                         unit_check_unneeded(other);
1100         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1101                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1102                         unit_check_unneeded(other);
1103         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1104                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1105                         unit_check_unneeded(other);
1106 }
1107
1108 void unit_trigger_on_failure(Unit *u) {
1109         Unit *other;
1110         Iterator i;
1111
1112         assert(u);
1113
1114         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1115                 return;
1116
1117         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1118
1119         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1120                 int r;
1121
1122                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1123                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1124         }
1125 }
1126
1127 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1128         bool unexpected;
1129
1130         assert(u);
1131         assert(os < _UNIT_ACTIVE_STATE_MAX);
1132         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1133
1134         /* Note that this is called for all low-level state changes,
1135          * even if they might map to the same high-level
1136          * UnitActiveState! That means that ns == os is OK an expected
1137          * behaviour here. For example: if a mount point is remounted
1138          * this function will be called too! */
1139
1140         if (u->meta.manager->n_reloading <= 0) {
1141                 dual_timestamp ts;
1142
1143                 dual_timestamp_get(&ts);
1144
1145                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1146                         u->meta.inactive_exit_timestamp = ts;
1147                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1148                         u->meta.inactive_enter_timestamp = ts;
1149
1150                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1151                         u->meta.active_enter_timestamp = ts;
1152                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1153                         u->meta.active_exit_timestamp = ts;
1154
1155                 timer_unit_notify(u, ns);
1156                 path_unit_notify(u, ns);
1157         }
1158
1159         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1160                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1161
1162         if (u->meta.job) {
1163                 unexpected = false;
1164
1165                 if (u->meta.job->state == JOB_WAITING)
1166
1167                         /* So we reached a different state for this
1168                          * job. Let's see if we can run it now if it
1169                          * failed previously due to EAGAIN. */
1170                         job_add_to_run_queue(u->meta.job);
1171
1172                 /* Let's check whether this state change constitutes a
1173                  * finished job, or maybe contradicts a running job and
1174                  * hence needs to invalidate jobs. */
1175
1176                 switch (u->meta.job->type) {
1177
1178                 case JOB_START:
1179                 case JOB_VERIFY_ACTIVE:
1180
1181                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1182                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1183                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1184                                 unexpected = true;
1185
1186                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1187                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1188                         }
1189
1190                         break;
1191
1192                 case JOB_RELOAD:
1193                 case JOB_RELOAD_OR_START:
1194
1195                         if (u->meta.job->state == JOB_RUNNING) {
1196                                 if (ns == UNIT_ACTIVE)
1197                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1198                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1199                                         unexpected = true;
1200
1201                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1202                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1203                                 }
1204                         }
1205
1206                         break;
1207
1208                 case JOB_STOP:
1209                 case JOB_RESTART:
1210                 case JOB_TRY_RESTART:
1211
1212                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1213                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1214                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1215                                 unexpected = true;
1216                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1217                         }
1218
1219                         break;
1220
1221                 default:
1222                         assert_not_reached("Job type unknown");
1223                 }
1224
1225         } else
1226                 unexpected = true;
1227
1228         if (u->meta.manager->n_reloading <= 0) {
1229
1230                 /* If this state change happened without being
1231                  * requested by a job, then let's retroactively start
1232                  * or stop dependencies. We skip that step when
1233                  * deserializing, since we don't want to create any
1234                  * additional jobs just because something is already
1235                  * activated. */
1236
1237                 if (unexpected) {
1238                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1239                                 retroactively_start_dependencies(u);
1240                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1241                                 retroactively_stop_dependencies(u);
1242                 }
1243
1244                 if (ns != os && ns == UNIT_FAILED) {
1245                         log_notice("Unit %s entered failed state.", u->meta.id);
1246                         unit_trigger_on_failure(u);
1247                 }
1248         }
1249
1250         /* Some names are special */
1251         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1252
1253                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1254                         /* The bus just might have become available,
1255                          * hence try to connect to it, if we aren't
1256                          * yet connected. */
1257                         bus_init(u->meta.manager, true);
1258
1259                 if (u->meta.type == UNIT_SERVICE &&
1260                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1261                     u->meta.manager->n_reloading <= 0) {
1262                         /* Write audit record if we have just finished starting up */
1263                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1264                         u->meta.in_audit = true;
1265                 }
1266
1267                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1268                         manager_send_unit_plymouth(u->meta.manager, u);
1269
1270         } else {
1271
1272                 /* We don't care about D-Bus here, since we'll get an
1273                  * asynchronous notification for it anyway. */
1274
1275                 if (u->meta.type == UNIT_SERVICE &&
1276                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1277                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1278                     u->meta.manager->n_reloading <= 0) {
1279
1280                         /* Hmm, if there was no start record written
1281                          * write it now, so that we always have a nice
1282                          * pair */
1283                         if (!u->meta.in_audit) {
1284                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1285
1286                                 if (ns == UNIT_INACTIVE)
1287                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1288                         } else
1289                                 /* Write audit record if we have just finished shutting down */
1290                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1291
1292                         u->meta.in_audit = false;
1293                 }
1294         }
1295
1296         manager_recheck_syslog(u->meta.manager);
1297
1298         /* Maybe we finished startup and are now ready for being
1299          * stopped because unneeded? */
1300         unit_check_unneeded(u);
1301
1302         unit_add_to_dbus_queue(u);
1303         unit_add_to_gc_queue(u);
1304 }
1305
1306 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1307         struct epoll_event ev;
1308
1309         assert(u);
1310         assert(fd >= 0);
1311         assert(w);
1312         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1313
1314         zero(ev);
1315         ev.data.ptr = w;
1316         ev.events = events;
1317
1318         if (epoll_ctl(u->meta.manager->epoll_fd,
1319                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1320                       fd,
1321                       &ev) < 0)
1322                 return -errno;
1323
1324         w->fd = fd;
1325         w->type = WATCH_FD;
1326         w->data.unit = u;
1327
1328         return 0;
1329 }
1330
1331 void unit_unwatch_fd(Unit *u, Watch *w) {
1332         assert(u);
1333         assert(w);
1334
1335         if (w->type == WATCH_INVALID)
1336                 return;
1337
1338         assert(w->type == WATCH_FD);
1339         assert(w->data.unit == u);
1340         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1341
1342         w->fd = -1;
1343         w->type = WATCH_INVALID;
1344         w->data.unit = NULL;
1345 }
1346
1347 int unit_watch_pid(Unit *u, pid_t pid) {
1348         assert(u);
1349         assert(pid >= 1);
1350
1351         /* Watch a specific PID. We only support one unit watching
1352          * each PID for now. */
1353
1354         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1355 }
1356
1357 void unit_unwatch_pid(Unit *u, pid_t pid) {
1358         assert(u);
1359         assert(pid >= 1);
1360
1361         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1362 }
1363
1364 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1365         struct itimerspec its;
1366         int flags, fd;
1367         bool ours;
1368
1369         assert(u);
1370         assert(w);
1371         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1372
1373         /* This will try to reuse the old timer if there is one */
1374
1375         if (w->type == WATCH_UNIT_TIMER) {
1376                 assert(w->data.unit == u);
1377                 assert(w->fd >= 0);
1378
1379                 ours = false;
1380                 fd = w->fd;
1381         } else if (w->type == WATCH_INVALID) {
1382
1383                 ours = true;
1384                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1385                         return -errno;
1386         } else
1387                 assert_not_reached("Invalid watch type");
1388
1389         zero(its);
1390
1391         if (delay <= 0) {
1392                 /* Set absolute time in the past, but not 0, since we
1393                  * don't want to disarm the timer */
1394                 its.it_value.tv_sec = 0;
1395                 its.it_value.tv_nsec = 1;
1396
1397                 flags = TFD_TIMER_ABSTIME;
1398         } else {
1399                 timespec_store(&its.it_value, delay);
1400                 flags = 0;
1401         }
1402
1403         /* This will also flush the elapse counter */
1404         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1405                 goto fail;
1406
1407         if (w->type == WATCH_INVALID) {
1408                 struct epoll_event ev;
1409
1410                 zero(ev);
1411                 ev.data.ptr = w;
1412                 ev.events = EPOLLIN;
1413
1414                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1415                         goto fail;
1416         }
1417
1418         w->type = WATCH_UNIT_TIMER;
1419         w->fd = fd;
1420         w->data.unit = u;
1421
1422         return 0;
1423
1424 fail:
1425         if (ours)
1426                 close_nointr_nofail(fd);
1427
1428         return -errno;
1429 }
1430
1431 void unit_unwatch_timer(Unit *u, Watch *w) {
1432         assert(u);
1433         assert(w);
1434
1435         if (w->type == WATCH_INVALID)
1436                 return;
1437
1438         assert(w->type == WATCH_UNIT_TIMER);
1439         assert(w->data.unit == u);
1440         assert(w->fd >= 0);
1441
1442         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1443         close_nointr_nofail(w->fd);
1444
1445         w->fd = -1;
1446         w->type = WATCH_INVALID;
1447         w->data.unit = NULL;
1448 }
1449
1450 bool unit_job_is_applicable(Unit *u, JobType j) {
1451         assert(u);
1452         assert(j >= 0 && j < _JOB_TYPE_MAX);
1453
1454         switch (j) {
1455
1456         case JOB_VERIFY_ACTIVE:
1457         case JOB_START:
1458         case JOB_STOP:
1459                 return true;
1460
1461         case JOB_RESTART:
1462         case JOB_TRY_RESTART:
1463                 return unit_can_start(u);
1464
1465         case JOB_RELOAD:
1466                 return unit_can_reload(u);
1467
1468         case JOB_RELOAD_OR_START:
1469                 return unit_can_reload(u) && unit_can_start(u);
1470
1471         default:
1472                 assert_not_reached("Invalid job type");
1473         }
1474 }
1475
1476 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1477
1478         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1479                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1480                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1481                 [UNIT_WANTS] = UNIT_WANTED_BY,
1482                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1483                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1484                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1485                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1486                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1487                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1488                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1489                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1490                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1491                 [UNIT_BEFORE] = UNIT_AFTER,
1492                 [UNIT_AFTER] = UNIT_BEFORE,
1493                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1494                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1495                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1496         };
1497         int r, q = 0, v = 0, w = 0;
1498
1499         assert(u);
1500         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1501         assert(other);
1502
1503         u = unit_follow_merge(u);
1504         other = unit_follow_merge(other);
1505
1506         /* We won't allow dependencies on ourselves. We will not
1507          * consider them an error however. */
1508         if (u == other)
1509                 return 0;
1510
1511         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1512                 return r;
1513
1514         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1515                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1516                         return r;
1517
1518         if (add_reference)
1519                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1520                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1521                         return r;
1522
1523         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1524                 return q;
1525
1526         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1527                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1528                         r = v;
1529                         goto fail;
1530                 }
1531
1532         if (add_reference) {
1533                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1534                         r = w;
1535                         goto fail;
1536                 }
1537
1538                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1539                         goto fail;
1540         }
1541
1542         unit_add_to_dbus_queue(u);
1543         return 0;
1544
1545 fail:
1546         if (q > 0)
1547                 set_remove(u->meta.dependencies[d], other);
1548
1549         if (v > 0)
1550                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1551
1552         if (w > 0)
1553                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1554
1555         return r;
1556 }
1557
1558 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1559         int r;
1560
1561         assert(u);
1562
1563         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1564                 return r;
1565
1566         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1567                 return r;
1568
1569         return 0;
1570 }
1571
1572 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1573         char *s;
1574
1575         assert(u);
1576         assert(name || path);
1577
1578         if (!name)
1579                 name = file_name_from_path(path);
1580
1581         if (!unit_name_is_template(name)) {
1582                 *p = NULL;
1583                 return name;
1584         }
1585
1586         if (u->meta.instance)
1587                 s = unit_name_replace_instance(name, u->meta.instance);
1588         else {
1589                 char *i;
1590
1591                 if (!(i = unit_name_to_prefix(u->meta.id)))
1592                         return NULL;
1593
1594                 s = unit_name_replace_instance(name, i);
1595                 free(i);
1596         }
1597
1598         if (!s)
1599                 return NULL;
1600
1601         *p = s;
1602         return s;
1603 }
1604
1605 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1606         Unit *other;
1607         int r;
1608         char *s;
1609
1610         assert(u);
1611         assert(name || path);
1612
1613         if (!(name = resolve_template(u, name, path, &s)))
1614                 return -ENOMEM;
1615
1616         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1617                 goto finish;
1618
1619         r = unit_add_dependency(u, d, other, add_reference);
1620
1621 finish:
1622         free(s);
1623         return r;
1624 }
1625
1626 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1627         Unit *other;
1628         int r;
1629         char *s;
1630
1631         assert(u);
1632         assert(name || path);
1633
1634         if (!(name = resolve_template(u, name, path, &s)))
1635                 return -ENOMEM;
1636
1637         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1638                 goto finish;
1639
1640         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1641
1642 finish:
1643         free(s);
1644         return r;
1645 }
1646
1647 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1648         Unit *other;
1649         int r;
1650         char *s;
1651
1652         assert(u);
1653         assert(name || path);
1654
1655         if (!(name = resolve_template(u, name, path, &s)))
1656                 return -ENOMEM;
1657
1658         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1659                 goto finish;
1660
1661         r = unit_add_dependency(other, d, u, add_reference);
1662
1663 finish:
1664         free(s);
1665         return r;
1666 }
1667
1668 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1669         Unit *other;
1670         int r;
1671         char *s;
1672
1673         assert(u);
1674         assert(name || path);
1675
1676         if (!(name = resolve_template(u, name, path, &s)))
1677                 return -ENOMEM;
1678
1679         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1680                 goto finish;
1681
1682         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1683                 goto finish;
1684
1685 finish:
1686         free(s);
1687         return r;
1688 }
1689
1690 int set_unit_path(const char *p) {
1691         char *cwd, *c;
1692         int r;
1693
1694         /* This is mostly for debug purposes */
1695
1696         if (path_is_absolute(p)) {
1697                 if (!(c = strdup(p)))
1698                         return -ENOMEM;
1699         } else {
1700                 if (!(cwd = get_current_dir_name()))
1701                         return -errno;
1702
1703                 r = asprintf(&c, "%s/%s", cwd, p);
1704                 free(cwd);
1705
1706                 if (r < 0)
1707                         return -ENOMEM;
1708         }
1709
1710         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1711                 r = -errno;
1712                 free(c);
1713                 return r;
1714         }
1715
1716         return 0;
1717 }
1718
1719 char *unit_dbus_path(Unit *u) {
1720         char *p, *e;
1721
1722         assert(u);
1723
1724         if (!u->meta.id)
1725                 return NULL;
1726
1727         if (!(e = bus_path_escape(u->meta.id)))
1728                 return NULL;
1729
1730         p = strappend("/org/freedesktop/systemd1/unit/", e);
1731         free(e);
1732
1733         return p;
1734 }
1735
1736 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1737         int r;
1738
1739         assert(u);
1740         assert(b);
1741
1742         assert(b->path);
1743
1744         if (!b->controller) {
1745                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1746                         return -ENOMEM;
1747
1748                 b->ours = true;
1749         }
1750
1751         /* Ensure this hasn't been added yet */
1752         assert(!b->unit);
1753
1754         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1755                 CGroupBonding *l;
1756
1757                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1758                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1759
1760                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1761                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1762                         return r;
1763                 }
1764         }
1765
1766         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1767         b->unit = u;
1768
1769         return 0;
1770 }
1771
1772 static char *default_cgroup_path(Unit *u) {
1773         char *p;
1774         int r;
1775
1776         assert(u);
1777
1778         if (u->meta.instance) {
1779                 char *t;
1780
1781                 if (!(t = unit_name_template(u->meta.id)))
1782                         return NULL;
1783
1784                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1785                 free(t);
1786         } else
1787                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1788
1789         return r < 0 ? NULL : p;
1790 }
1791
1792 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1793         char *controller = NULL, *path = NULL;
1794         CGroupBonding *b = NULL;
1795         bool ours = false;
1796         int r;
1797
1798         assert(u);
1799         assert(name);
1800
1801         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1802                 return r;
1803
1804         if (!path) {
1805                 path = default_cgroup_path(u);
1806                 ours = true;
1807         }
1808
1809         if (!controller) {
1810                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1811                 ours = true;
1812         }
1813
1814         if (!path || !controller) {
1815                 free(path);
1816                 free(controller);
1817
1818                 return -ENOMEM;
1819         }
1820
1821         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1822                 r = -EEXIST;
1823                 goto fail;
1824         }
1825
1826         if (!(b = new0(CGroupBonding, 1))) {
1827                 r = -ENOMEM;
1828                 goto fail;
1829         }
1830
1831         b->controller = controller;
1832         b->path = path;
1833         b->ours = ours;
1834         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1835
1836         if ((r = unit_add_cgroup(u, b)) < 0)
1837                 goto fail;
1838
1839         return 0;
1840
1841 fail:
1842         free(path);
1843         free(controller);
1844         free(b);
1845
1846         return r;
1847 }
1848
1849 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1850         CGroupBonding *b = NULL;
1851         int r = -ENOMEM;
1852
1853         assert(u);
1854
1855         if (!controller)
1856                 controller = SYSTEMD_CGROUP_CONTROLLER;
1857
1858         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1859                 return 0;
1860
1861         if (!(b = new0(CGroupBonding, 1)))
1862                 return -ENOMEM;
1863
1864         if (!(b->controller = strdup(controller)))
1865                 goto fail;
1866
1867         if (!(b->path = default_cgroup_path(u)))
1868                 goto fail;
1869
1870         b->ours = true;
1871         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1872
1873         if ((r = unit_add_cgroup(u, b)) < 0)
1874                 goto fail;
1875
1876         return 0;
1877
1878 fail:
1879         free(b->path);
1880         free(b->controller);
1881         free(b);
1882
1883         return r;
1884 }
1885
1886 int unit_add_default_cgroups(Unit *u) {
1887         char **c;
1888         int r;
1889         assert(u);
1890
1891         /* Adds in the default cgroups, if they weren't specified
1892          * otherwise. */
1893
1894         if (!u->meta.manager->cgroup_hierarchy)
1895                 return 0;
1896
1897         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1898                 return r;
1899
1900         STRV_FOREACH(c, u->meta.manager->default_controllers)
1901                 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1902                         return r;
1903
1904         return 0;
1905 }
1906
1907 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1908         assert(u);
1909
1910         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1911 }
1912
1913 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1914         char *t;
1915         int r;
1916
1917         assert(u);
1918         assert(type);
1919         assert(_found);
1920
1921         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1922                 return -ENOMEM;
1923
1924         assert(!unit_has_name(u, t));
1925
1926         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1927         free(t);
1928
1929         assert(r < 0 || *_found != u);
1930
1931         return r;
1932 }
1933
1934 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1935         Unit *found;
1936         char *t;
1937
1938         assert(u);
1939         assert(type);
1940         assert(_found);
1941
1942         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1943                 return -ENOMEM;
1944
1945         assert(!unit_has_name(u, t));
1946
1947         found = manager_get_unit(u->meta.manager, t);
1948         free(t);
1949
1950         if (!found)
1951                 return -ENOENT;
1952
1953         *_found = found;
1954         return 0;
1955 }
1956
1957 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1958         Unit *u = userdata;
1959         assert(u);
1960
1961         return unit_name_to_prefix_and_instance(u->meta.id);
1962 }
1963
1964 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1965         Unit *u = userdata;
1966         assert(u);
1967
1968         return unit_name_to_prefix(u->meta.id);
1969 }
1970
1971 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1972         Unit *u = userdata;
1973         char *p, *r;
1974
1975         assert(u);
1976
1977         if (!(p = unit_name_to_prefix(u->meta.id)))
1978                 return NULL;
1979
1980         r = unit_name_unescape(p);
1981         free(p);
1982
1983         return r;
1984 }
1985
1986 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1987         Unit *u = userdata;
1988         assert(u);
1989
1990         if (u->meta.instance)
1991                 return unit_name_unescape(u->meta.instance);
1992
1993         return strdup("");
1994 }
1995
1996 static char *specifier_filename(char specifier, void *data, void *userdata) {
1997         Unit *u = userdata;
1998         assert(u);
1999
2000         if (u->meta.instance)
2001                 return unit_name_path_unescape(u->meta.instance);
2002
2003         return unit_name_to_path(u->meta.instance);
2004 }
2005
2006 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2007         Unit *u = userdata;
2008         assert(u);
2009
2010         return default_cgroup_path(u);
2011 }
2012
2013 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2014         Unit *u = userdata;
2015         char *p;
2016         assert(u);
2017
2018         if (specifier == 'r')
2019                 return strdup(u->meta.manager->cgroup_hierarchy);
2020
2021         if (parent_of_path(u->meta.manager->cgroup_hierarchy, &p) < 0)
2022                 return strdup("");
2023
2024         if (streq(p, "/")) {
2025                 free(p);
2026                 return strdup("");
2027         }
2028
2029         return p;
2030 }
2031
2032 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2033         Unit *u = userdata;
2034         assert(u);
2035
2036         if (u->meta.manager->running_as == MANAGER_USER) {
2037                 const char *e;
2038
2039                 e = getenv("XDG_RUNTIME_DIR");
2040                 if (e)
2041                         return strdup(e);
2042         }
2043
2044         return strdup("/run");
2045 }
2046
2047 char *unit_name_printf(Unit *u, const char* format) {
2048
2049         /*
2050          * This will use the passed string as format string and
2051          * replace the following specifiers:
2052          *
2053          * %n: the full id of the unit                 (foo@bar.waldo)
2054          * %N: the id of the unit without the suffix   (foo@bar)
2055          * %p: the prefix                              (foo)
2056          * %i: the instance                            (bar)
2057          */
2058
2059         const Specifier table[] = {
2060                 { 'n', specifier_string,              u->meta.id },
2061                 { 'N', specifier_prefix_and_instance, NULL },
2062                 { 'p', specifier_prefix,              NULL },
2063                 { 'i', specifier_string,              u->meta.instance },
2064                 { 0, NULL, NULL }
2065         };
2066
2067         assert(u);
2068         assert(format);
2069
2070         return specifier_printf(format, table, u);
2071 }
2072
2073 char *unit_full_printf(Unit *u, const char *format) {
2074
2075         /* This is similar to unit_name_printf() but also supports
2076          * unescaping. Also, adds a couple of additional codes:
2077          *
2078          * %c cgroup path of unit
2079          * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2080          * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2081          * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2082          */
2083
2084         const Specifier table[] = {
2085                 { 'n', specifier_string,              u->meta.id },
2086                 { 'N', specifier_prefix_and_instance, NULL },
2087                 { 'p', specifier_prefix,              NULL },
2088                 { 'P', specifier_prefix_unescaped,    NULL },
2089                 { 'i', specifier_string,              u->meta.instance },
2090                 { 'I', specifier_instance_unescaped,  NULL },
2091                 { 'f', specifier_filename,            NULL },
2092                 { 'c', specifier_cgroup,              NULL },
2093                 { 'r', specifier_cgroup_root,         NULL },
2094                 { 'R', specifier_cgroup_root,         NULL },
2095                 { 't', specifier_runtime,             NULL },
2096                 { 0, NULL, NULL }
2097         };
2098
2099         assert(u);
2100         assert(format);
2101
2102         return specifier_printf(format, table, u);
2103 }
2104
2105 char **unit_full_printf_strv(Unit *u, char **l) {
2106         size_t n;
2107         char **r, **i, **j;
2108
2109         /* Applies unit_full_printf to every entry in l */
2110
2111         assert(u);
2112
2113         n = strv_length(l);
2114         if (!(r = new(char*, n+1)))
2115                 return NULL;
2116
2117         for (i = l, j = r; *i; i++, j++)
2118                 if (!(*j = unit_full_printf(u, *i)))
2119                         goto fail;
2120
2121         *j = NULL;
2122         return r;
2123
2124 fail:
2125         for (j--; j >= r; j--)
2126                 free(*j);
2127
2128         free(r);
2129
2130         return NULL;
2131 }
2132
2133 int unit_watch_bus_name(Unit *u, const char *name) {
2134         assert(u);
2135         assert(name);
2136
2137         /* Watch a specific name on the bus. We only support one unit
2138          * watching each name for now. */
2139
2140         return hashmap_put(u->meta.manager->watch_bus, name, u);
2141 }
2142
2143 void unit_unwatch_bus_name(Unit *u, const char *name) {
2144         assert(u);
2145         assert(name);
2146
2147         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2148 }
2149
2150 bool unit_can_serialize(Unit *u) {
2151         assert(u);
2152
2153         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2154 }
2155
2156 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2157         int r;
2158
2159         assert(u);
2160         assert(f);
2161         assert(fds);
2162
2163         if (!unit_can_serialize(u))
2164                 return 0;
2165
2166         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2167                 return r;
2168
2169         if (u->meta.job)
2170                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2171
2172         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2173         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2174         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2175         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2176         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2177
2178         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2179                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2180
2181         /* End marker */
2182         fputc('\n', f);
2183         return 0;
2184 }
2185
2186 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2187         va_list ap;
2188
2189         assert(u);
2190         assert(f);
2191         assert(key);
2192         assert(format);
2193
2194         fputs(key, f);
2195         fputc('=', f);
2196
2197         va_start(ap, format);
2198         vfprintf(f, format, ap);
2199         va_end(ap);
2200
2201         fputc('\n', f);
2202 }
2203
2204 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2205         assert(u);
2206         assert(f);
2207         assert(key);
2208         assert(value);
2209
2210         fprintf(f, "%s=%s\n", key, value);
2211 }
2212
2213 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2214         int r;
2215
2216         assert(u);
2217         assert(f);
2218         assert(fds);
2219
2220         if (!unit_can_serialize(u))
2221                 return 0;
2222
2223         for (;;) {
2224                 char line[LINE_MAX], *l, *v;
2225                 size_t k;
2226
2227                 if (!fgets(line, sizeof(line), f)) {
2228                         if (feof(f))
2229                                 return 0;
2230                         return -errno;
2231                 }
2232
2233                 char_array_0(line);
2234                 l = strstrip(line);
2235
2236                 /* End marker */
2237                 if (l[0] == 0)
2238                         return 0;
2239
2240                 k = strcspn(l, "=");
2241
2242                 if (l[k] == '=') {
2243                         l[k] = 0;
2244                         v = l+k+1;
2245                 } else
2246                         v = l+k;
2247
2248                 if (streq(l, "job")) {
2249                         JobType type;
2250
2251                         if ((type = job_type_from_string(v)) < 0)
2252                                 log_debug("Failed to parse job type value %s", v);
2253                         else
2254                                 u->meta.deserialized_job = type;
2255
2256                         continue;
2257                 } else if (streq(l, "inactive-exit-timestamp")) {
2258                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2259                         continue;
2260                 } else if (streq(l, "active-enter-timestamp")) {
2261                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2262                         continue;
2263                 } else if (streq(l, "active-exit-timestamp")) {
2264                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2265                         continue;
2266                 } else if (streq(l, "inactive-enter-timestamp")) {
2267                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2268                         continue;
2269                 } else if (streq(l, "condition-timestamp")) {
2270                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2271                         continue;
2272                 } else if (streq(l, "condition-result")) {
2273                         int b;
2274
2275                         if ((b = parse_boolean(v)) < 0)
2276                                 log_debug("Failed to parse condition result value %s", v);
2277                         else
2278                                 u->meta.condition_result = b;
2279
2280                         continue;
2281                 }
2282
2283                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2284                         return r;
2285         }
2286 }
2287
2288 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2289         Unit *device;
2290         char *e;
2291         int r;
2292
2293         assert(u);
2294
2295         if (!what)
2296                 return 0;
2297
2298         /* Adds in links to the device node that this unit is based on */
2299
2300         if (!is_device_path(what))
2301                 return 0;
2302
2303         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2304                 return -ENOMEM;
2305
2306         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2307         free(e);
2308
2309         if (r < 0)
2310                 return r;
2311
2312         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2313                 return r;
2314
2315         if (wants)
2316                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2317                         return r;
2318
2319         return 0;
2320 }
2321
2322 int unit_coldplug(Unit *u) {
2323         int r;
2324
2325         assert(u);
2326
2327         if (UNIT_VTABLE(u)->coldplug)
2328                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2329                         return r;
2330
2331         if (u->meta.deserialized_job >= 0) {
2332                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2333                         return r;
2334
2335                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2336         }
2337
2338         return 0;
2339 }
2340
2341 void unit_status_printf(Unit *u, const char *format, ...) {
2342         va_list ap;
2343
2344         assert(u);
2345         assert(format);
2346
2347         if (!UNIT_VTABLE(u)->show_status)
2348                 return;
2349
2350         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2351                 return;
2352
2353         /* If Plymouth is running make sure we show the status, so
2354          * that there's something nice to see when people press Esc */
2355
2356         if (!u->meta.manager->show_status && !plymouth_running())
2357                 return;
2358
2359         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2360                 return;
2361
2362         va_start(ap, format);
2363         status_vprintf(format, ap);
2364         va_end(ap);
2365 }
2366
2367 bool unit_need_daemon_reload(Unit *u) {
2368         assert(u);
2369
2370         if (u->meta.fragment_path) {
2371                 struct stat st;
2372
2373                 zero(st);
2374                 if (stat(u->meta.fragment_path, &st) < 0)
2375                         /* What, cannot access this anymore? */
2376                         return true;
2377
2378                 if (u->meta.fragment_mtime > 0 &&
2379                     timespec_load(&st.st_mtim) != u->meta.fragment_mtime)
2380                         return true;
2381         }
2382
2383         if (UNIT_VTABLE(u)->need_daemon_reload)
2384                 return UNIT_VTABLE(u)->need_daemon_reload(u);
2385
2386         return false;
2387 }
2388
2389 void unit_reset_failed(Unit *u) {
2390         assert(u);
2391
2392         if (UNIT_VTABLE(u)->reset_failed)
2393                 UNIT_VTABLE(u)->reset_failed(u);
2394 }
2395
2396 Unit *unit_following(Unit *u) {
2397         assert(u);
2398
2399         if (UNIT_VTABLE(u)->following)
2400                 return UNIT_VTABLE(u)->following(u);
2401
2402         return NULL;
2403 }
2404
2405 bool unit_pending_inactive(Unit *u) {
2406         assert(u);
2407
2408         /* Returns true if the unit is inactive or going down */
2409
2410         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2411                 return true;
2412
2413         if (u->meta.job && u->meta.job->type == JOB_STOP)
2414                 return true;
2415
2416         return false;
2417 }
2418
2419 bool unit_pending_active(Unit *u) {
2420         assert(u);
2421
2422         /* Returns true if the unit is inactive or going down */
2423
2424         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2425                 return true;
2426
2427         if (u->meta.job &&
2428             (u->meta.job->type == JOB_START ||
2429              u->meta.job->type == JOB_RELOAD_OR_START ||
2430              u->meta.job->type == JOB_RESTART))
2431                 return true;
2432
2433         return false;
2434 }
2435
2436 UnitType unit_name_to_type(const char *n) {
2437         UnitType t;
2438
2439         assert(n);
2440
2441         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2442                 if (endswith(n, unit_vtable[t]->suffix))
2443                         return t;
2444
2445         return _UNIT_TYPE_INVALID;
2446 }
2447
2448 bool unit_name_is_valid(const char *n, bool template_ok) {
2449         UnitType t;
2450
2451         t = unit_name_to_type(n);
2452         if (t < 0 || t >= _UNIT_TYPE_MAX)
2453                 return false;
2454
2455         return unit_name_is_valid_no_type(n, template_ok);
2456 }
2457
2458 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2459         assert(u);
2460         assert(w >= 0 && w < _KILL_WHO_MAX);
2461         assert(m >= 0 && m < _KILL_MODE_MAX);
2462         assert(signo > 0);
2463         assert(signo < _NSIG);
2464
2465         if (m == KILL_NONE)
2466                 return 0;
2467
2468         if (!UNIT_VTABLE(u)->kill)
2469                 return -ENOTSUP;
2470
2471         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2472 }
2473
2474 int unit_following_set(Unit *u, Set **s) {
2475         assert(u);
2476         assert(s);
2477
2478         if (UNIT_VTABLE(u)->following_set)
2479                 return UNIT_VTABLE(u)->following_set(u, s);
2480
2481         *s = NULL;
2482         return 0;
2483 }
2484
2485 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2486         [UNIT_STUB] = "stub",
2487         [UNIT_LOADED] = "loaded",
2488         [UNIT_ERROR] = "error",
2489         [UNIT_MERGED] = "merged",
2490         [UNIT_MASKED] = "masked"
2491 };
2492
2493 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2494
2495 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2496         [UNIT_ACTIVE] = "active",
2497         [UNIT_RELOADING] = "reloading",
2498         [UNIT_INACTIVE] = "inactive",
2499         [UNIT_FAILED] = "failed",
2500         [UNIT_ACTIVATING] = "activating",
2501         [UNIT_DEACTIVATING] = "deactivating"
2502 };
2503
2504 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2505
2506 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2507         [UNIT_REQUIRES] = "Requires",
2508         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2509         [UNIT_WANTS] = "Wants",
2510         [UNIT_REQUISITE] = "Requisite",
2511         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2512         [UNIT_REQUIRED_BY] = "RequiredBy",
2513         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2514         [UNIT_BIND_TO] = "BindTo",
2515         [UNIT_WANTED_BY] = "WantedBy",
2516         [UNIT_CONFLICTS] = "Conflicts",
2517         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2518         [UNIT_BOUND_BY] = "BoundBy",
2519         [UNIT_BEFORE] = "Before",
2520         [UNIT_AFTER] = "After",
2521         [UNIT_REFERENCES] = "References",
2522         [UNIT_REFERENCED_BY] = "ReferencedBy",
2523         [UNIT_ON_FAILURE] = "OnFailure"
2524 };
2525
2526 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);