src/unit.c

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