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         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 651                 Unit *other;
 652
 653                 SET_FOREACH(other, u->meta.dependencies[d], i)
 654                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 655         }
 656
 657         if (u->meta.load_state == UNIT_LOADED) {
 658                 fprintf(f,
 659                         "%s\tStopWhenUnneeded: %s\n"
 660                         "%s\tRefuseManualStart: %s\n"
 661                         "%s\tRefuseManualStop: %s\n"
 662                         "%s\tDefaultDependencies: %s\n",
 663                         prefix, yes_no(u->meta.stop_when_unneeded),
 664                         prefix, yes_no(u->meta.refuse_manual_start),
 665                         prefix, yes_no(u->meta.refuse_manual_stop),
 666                         prefix, yes_no(u->meta.default_dependencies));
 667
 668                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 669                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 670                                 prefix, b->controller, b->path);
 671
 672                 if (UNIT_VTABLE(u)->dump)
 673                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 674
 675         } else if (u->meta.load_state == UNIT_MERGED)
 676                 fprintf(f,
 677                         "%s\tMerged into: %s\n",
 678                         prefix, u->meta.merged_into->meta.id);
 679         else if (u->meta.load_state == UNIT_ERROR)
 680                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 681
 682
 683         if (u->meta.job)
 684                 job_dump(u->meta.job, f, prefix2);
 685
 686         free(p2);
 687 }
 688
 689 /* Common implementation for multiple backends */
 690 int unit_load_fragment_and_dropin(Unit *u) {
 691         int r;
 692
 693         assert(u);
 694
 695         /* Load a .service file */
 696         if ((r = unit_load_fragment(u)) < 0)
 697                 return r;
 698
 699         if (u->meta.load_state == UNIT_STUB)
 700                 return -ENOENT;
 701
 702         /* Load drop-in directory data */
 703         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 704                 return r;
 705
 706         return 0;
 707 }
 708
 709 /* Common implementation for multiple backends */
 710 int unit_load_fragment_and_dropin_optional(Unit *u) {
 711         int r;
 712
 713         assert(u);
 714
 715         /* Same as unit_load_fragment_and_dropin(), but whether
 716          * something can be loaded or not doesn't matter. */
 717
 718         /* Load a .service file */
 719         if ((r = unit_load_fragment(u)) < 0)
 720                 return r;
 721
 722         if (u->meta.load_state == UNIT_STUB)
 723                 u->meta.load_state = UNIT_LOADED;
 724
 725         /* Load drop-in directory data */
 726         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 727                 return r;
 728
 729         return 0;
 730 }
 731
 732 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 733         assert(u);
 734         assert(target);
 735
 736         if (target->meta.type != UNIT_TARGET)
 737                 return 0;
 738
 739         /* Only add the dependency if both units are loaded, so that
 740          * that loop check below is reliable */
 741         if (u->meta.load_state != UNIT_LOADED ||
 742             target->meta.load_state != UNIT_LOADED)
 743                 return 0;
 744
 745         /* If either side wants no automatic dependencies, then let's
 746          * skip this */
 747         if (!u->meta.default_dependencies ||
 748             target->meta.default_dependencies)
 749                 return 0;
 750
 751         /* Don't create loops */
 752         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 753                 return 0;
 754
 755         return unit_add_dependency(target, UNIT_AFTER, u, true);
 756 }
 757
 758 static int unit_add_default_dependencies(Unit *u) {
 759         static const UnitDependency deps[] = {
 760                 UNIT_REQUIRED_BY,
 761                 UNIT_REQUIRED_BY_OVERRIDABLE,
 762                 UNIT_WANTED_BY,
 763                 UNIT_BOUND_BY
 764         };
 765
 766         Unit *target;
 767         Iterator i;
 768         int r;
 769         unsigned k;
 770
 771         assert(u);
 772
 773         for (k = 0; k < ELEMENTSOF(deps); k++)
 774                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 775                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 776                                 return r;
 777
 778         return 0;
 779 }
 780
 781 int unit_load(Unit *u) {
 782         int r;
 783
 784         assert(u);
 785
 786         if (u->meta.in_load_queue) {
 787                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 788                 u->meta.in_load_queue = false;
 789         }
 790
 791         if (u->meta.type == _UNIT_TYPE_INVALID)
 792                 return -EINVAL;
 793
 794         if (u->meta.load_state != UNIT_STUB)
 795                 return 0;
 796
 797         if (UNIT_VTABLE(u)->load)
 798                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 799                         goto fail;
 800
 801         if (u->meta.load_state == UNIT_STUB) {
 802                 r = -ENOENT;
 803                 goto fail;
 804         }
 805
 806         if (u->meta.load_state == UNIT_LOADED &&
 807             u->meta.default_dependencies)
 808                 if ((r = unit_add_default_dependencies(u)) < 0)
 809                         goto fail;
 810
 811         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 812
 813         unit_add_to_dbus_queue(unit_follow_merge(u));
 814         unit_add_to_gc_queue(u);
 815
 816         return 0;
 817
 818 fail:
 819         u->meta.load_state = UNIT_ERROR;
 820         u->meta.load_error = r;
 821         unit_add_to_dbus_queue(u);
 822
 823         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 824
 825         return r;
 826 }
 827
 828 /* Errors:
 829  *         -EBADR:     This unit type does not support starting.
 830  *         -EALREADY:  Unit is already started.
 831  *         -EAGAIN:    An operation is already in progress. Retry later.
 832  *         -ECANCELED: Too many requests for now.
 833  */
 834 int unit_start(Unit *u) {
 835         UnitActiveState state;
 836         Unit *following;
 837
 838         assert(u);
 839
 840         if (u->meta.load_state != UNIT_LOADED)
 841                 return -EINVAL;
 842
 843         /* If this is already (being) started, then this will
 844          * succeed. Note that this will even succeed if this unit is
 845          * not startable by the user. This is relied on to detect when
 846          * we need to wait for units and when waiting is finished. */
 847         state = unit_active_state(u);
 848         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 849                 return -EALREADY;
 850
 851         /* If the conditions failed, don't do anything at all */
 852         if (!condition_test_list(u->meta.conditions)) {
 853                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 854                 return -EALREADY;
 855         }
 856
 857         /* Forward to the main object, if we aren't it. */
 858         if ((following = unit_following(u))) {
 859                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 860                 return unit_start(following);
 861         }
 862
 863         /* If it is stopped, but we cannot start it, then fail */
 864         if (!UNIT_VTABLE(u)->start)
 865                 return -EBADR;
 866
 867         /* We don't suppress calls to ->start() here when we are
 868          * already starting, to allow this request to be used as a
 869          * "hurry up" call, for example when the unit is in some "auto
 870          * restart" state where it waits for a holdoff timer to elapse
 871          * before it will start again. */
 872
 873         unit_add_to_dbus_queue(u);
 874
 875         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 876         return UNIT_VTABLE(u)->start(u);
 877 }
 878
 879 bool unit_can_start(Unit *u) {
 880         assert(u);
 881
 882         return !!UNIT_VTABLE(u)->start;
 883 }
 884
 885 bool unit_can_isolate(Unit *u) {
 886         assert(u);
 887
 888         return unit_can_start(u) &&
 889                 u->meta.allow_isolate;
 890 }
 891
 892 /* Errors:
 893  *         -EBADR:    This unit type does not support stopping.
 894  *         -EALREADY: Unit is already stopped.
 895  *         -EAGAIN:   An operation is already in progress. Retry later.
 896  */
 897 int unit_stop(Unit *u) {
 898         UnitActiveState state;
 899         Unit *following;
 900
 901         assert(u);
 902
 903         state = unit_active_state(u);
 904         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 905                 return -EALREADY;
 906
 907         if ((following = unit_following(u))) {
 908                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 909                 return unit_stop(following);
 910         }
 911
 912         if (!UNIT_VTABLE(u)->stop)
 913                 return -EBADR;
 914
 915         unit_add_to_dbus_queue(u);
 916
 917         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 918         return UNIT_VTABLE(u)->stop(u);
 919 }
 920
 921 /* Errors:
 922  *         -EBADR:    This unit type does not support reloading.
 923  *         -ENOEXEC:  Unit is not started.
 924  *         -EAGAIN:   An operation is already in progress. Retry later.
 925  */
 926 int unit_reload(Unit *u) {
 927         UnitActiveState state;
 928         Unit *following;
 929
 930         assert(u);
 931
 932         if (u->meta.load_state != UNIT_LOADED)
 933                 return -EINVAL;
 934
 935         if (!unit_can_reload(u))
 936                 return -EBADR;
 937
 938         state = unit_active_state(u);
 939         if (state == UNIT_RELOADING)
 940                 return -EALREADY;
 941
 942         if (state != UNIT_ACTIVE)
 943                 return -ENOEXEC;
 944
 945         if ((following = unit_following(u))) {
 946                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
 947                 return unit_reload(following);
 948         }
 949
 950         unit_add_to_dbus_queue(u);
 951         return UNIT_VTABLE(u)->reload(u);
 952 }
 953
 954 bool unit_can_reload(Unit *u) {
 955         assert(u);
 956
 957         if (!UNIT_VTABLE(u)->reload)
 958                 return false;
 959
 960         if (!UNIT_VTABLE(u)->can_reload)
 961                 return true;
 962
 963         return UNIT_VTABLE(u)->can_reload(u);
 964 }
 965
 966 static void unit_check_unneeded(Unit *u) {
 967         Iterator i;
 968         Unit *other;
 969
 970         assert(u);
 971
 972         /* If this service shall be shut down when unneeded then do
 973          * so. */
 974
 975         if (!u->meta.stop_when_unneeded)
 976                 return;
 977
 978         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 979                 return;
 980
 981         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 982                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 983                         return;
 984
 985         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 986                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 987                         return;
 988
 989         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 990                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 991                         return;
 992
 993         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
 994                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 995                         return;
 996
 997         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 998
 999         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1000         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1001 }
1002
1003 static void retroactively_start_dependencies(Unit *u) {
1004         Iterator i;
1005         Unit *other;
1006
1007         assert(u);
1008         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1009
1010         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1011                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1012                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1013                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1014
1015         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1016                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1017                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1018                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1019
1020         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1021                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1022                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1023                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1024
1025         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1026                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1027                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1028                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1029
1030         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1031                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1032                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1033                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1034
1035         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1036                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1037                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1038
1039         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1040                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1041                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1042 }
1043
1044 static void retroactively_stop_dependencies(Unit *u) {
1045         Iterator i;
1046         Unit *other;
1047
1048         assert(u);
1049         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1050
1051         /* Pull down units which are bound to us recursively if enabled */
1052         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1053                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1054                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1055
1056         /* Garbage collect services that might not be needed anymore, if enabled */
1057         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1058                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1059                         unit_check_unneeded(other);
1060         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1061                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1062                         unit_check_unneeded(other);
1063         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1064                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1065                         unit_check_unneeded(other);
1066         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1067                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1068                         unit_check_unneeded(other);
1069         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1070                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1071                         unit_check_unneeded(other);
1072         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1073                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1074                         unit_check_unneeded(other);
1075 }
1076
1077 void unit_trigger_on_failure(Unit *u) {
1078         Unit *other;
1079         Iterator i;
1080
1081         assert(u);
1082
1083         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1084                 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1085 }
1086
1087 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1088         dual_timestamp ts;
1089         bool unexpected;
1090
1091         assert(u);
1092         assert(os < _UNIT_ACTIVE_STATE_MAX);
1093         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1094
1095         /* Note that this is called for all low-level state changes,
1096          * even if they might map to the same high-level
1097          * UnitActiveState! That means that ns == os is OK an expected
1098          * behaviour here. For example: if a mount point is remounted
1099          * this function will be called too! */
1100
1101         dual_timestamp_get(&ts);
1102
1103         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1104                 u->meta.inactive_exit_timestamp = ts;
1105         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1106                 u->meta.inactive_enter_timestamp = ts;
1107
1108         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1109                 u->meta.active_enter_timestamp = ts;
1110         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1111                 u->meta.active_exit_timestamp = ts;
1112
1113         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1114                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1115
1116         timer_unit_notify(u, ns);
1117         path_unit_notify(u, ns);
1118
1119         if (u->meta.job) {
1120                 unexpected = false;
1121
1122                 if (u->meta.job->state == JOB_WAITING)
1123
1124                         /* So we reached a different state for this
1125                          * job. Let's see if we can run it now if it
1126                          * failed previously due to EAGAIN. */
1127                         job_add_to_run_queue(u->meta.job);
1128
1129                 /* Let's check whether this state change constitutes a
1130                  * finished job, or maybe contradicts a running job and
1131                  * hence needs to invalidate jobs. */
1132
1133                 switch (u->meta.job->type) {
1134
1135                 case JOB_START:
1136                 case JOB_VERIFY_ACTIVE:
1137
1138                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1139                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1140                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1141                                 unexpected = true;
1142
1143                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1144                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1145                         }
1146
1147                         break;
1148
1149                 case JOB_RELOAD:
1150                 case JOB_RELOAD_OR_START:
1151
1152                         if (u->meta.job->state == JOB_RUNNING) {
1153                                 if (ns == UNIT_ACTIVE)
1154                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1155                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1156                                         unexpected = true;
1157
1158                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1159                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1160                                 }
1161                         }
1162
1163                         break;
1164
1165                 case JOB_STOP:
1166                 case JOB_RESTART:
1167                 case JOB_TRY_RESTART:
1168
1169                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1170                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1171                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1172                                 unexpected = true;
1173                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1174                         }
1175
1176                         break;
1177
1178                 default:
1179                         assert_not_reached("Job type unknown");
1180                 }
1181
1182         } else
1183                 unexpected = true;
1184
1185         /* If this state change happened without being requested by a
1186          * job, then let's retroactively start or stop
1187          * dependencies. We skip that step when deserializing, since
1188          * we don't want to create any additional jobs just because
1189          * something is already activated. */
1190
1191         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1192                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1193                         retroactively_start_dependencies(u);
1194                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1195                         retroactively_stop_dependencies(u);
1196         }
1197
1198         if (ns != os && ns == UNIT_FAILED) {
1199                 log_notice("Unit %s entered failed state.", u->meta.id);
1200                 unit_trigger_on_failure(u);
1201         }
1202
1203         /* Some names are special */
1204         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1205                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1206                         /* The bus just might have become available,
1207                          * hence try to connect to it, if we aren't
1208                          * yet connected. */
1209                         bus_init(u->meta.manager, true);
1210
1211                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1212                         /* The syslog daemon just might have become
1213                          * available, hence try to connect to it, if
1214                          * we aren't yet connected. */
1215                         log_open();
1216
1217                 if (u->meta.type == UNIT_SERVICE &&
1218                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1219                         /* Write audit record if we have just finished starting up */
1220                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1221                         u->meta.in_audit = true;
1222                 }
1223
1224                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1225                         manager_send_unit_plymouth(u->meta.manager, u);
1226
1227         } else {
1228
1229                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1230                         /* The syslog daemon might just have
1231                          * terminated, hence try to disconnect from
1232                          * it. */
1233                         log_close_syslog();
1234
1235                 /* We don't care about D-Bus here, since we'll get an
1236                  * asynchronous notification for it anyway. */
1237
1238                 if (u->meta.type == UNIT_SERVICE &&
1239                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1240                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1241
1242                         /* Hmm, if there was no start record written
1243                          * write it now, so that we always have a nice
1244                          * pair */
1245                         if (!u->meta.in_audit) {
1246                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1247
1248                                 if (ns == UNIT_INACTIVE)
1249                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1250                         } else
1251                                 /* Write audit record if we have just finished shutting down */
1252                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1253
1254                         u->meta.in_audit = false;
1255                 }
1256         }
1257
1258         /* Maybe we finished startup and are now ready for being
1259          * stopped because unneeded? */
1260         unit_check_unneeded(u);
1261
1262         unit_add_to_dbus_queue(u);
1263         unit_add_to_gc_queue(u);
1264 }
1265
1266 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1267         struct epoll_event ev;
1268
1269         assert(u);
1270         assert(fd >= 0);
1271         assert(w);
1272         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1273
1274         zero(ev);
1275         ev.data.ptr = w;
1276         ev.events = events;
1277
1278         if (epoll_ctl(u->meta.manager->epoll_fd,
1279                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1280                       fd,
1281                       &ev) < 0)
1282                 return -errno;
1283
1284         w->fd = fd;
1285         w->type = WATCH_FD;
1286         w->data.unit = u;
1287
1288         return 0;
1289 }
1290
1291 void unit_unwatch_fd(Unit *u, Watch *w) {
1292         assert(u);
1293         assert(w);
1294
1295         if (w->type == WATCH_INVALID)
1296                 return;
1297
1298         assert(w->type == WATCH_FD);
1299         assert(w->data.unit == u);
1300         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1301
1302         w->fd = -1;
1303         w->type = WATCH_INVALID;
1304         w->data.unit = NULL;
1305 }
1306
1307 int unit_watch_pid(Unit *u, pid_t pid) {
1308         assert(u);
1309         assert(pid >= 1);
1310
1311         /* Watch a specific PID. We only support one unit watching
1312          * each PID for now. */
1313
1314         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1315 }
1316
1317 void unit_unwatch_pid(Unit *u, pid_t pid) {
1318         assert(u);
1319         assert(pid >= 1);
1320
1321         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1322 }
1323
1324 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1325         struct itimerspec its;
1326         int flags, fd;
1327         bool ours;
1328
1329         assert(u);
1330         assert(w);
1331         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1332
1333         /* This will try to reuse the old timer if there is one */
1334
1335         if (w->type == WATCH_UNIT_TIMER) {
1336                 assert(w->data.unit == u);
1337                 assert(w->fd >= 0);
1338
1339                 ours = false;
1340                 fd = w->fd;
1341         } else if (w->type == WATCH_INVALID) {
1342
1343                 ours = true;
1344                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1345                         return -errno;
1346         } else
1347                 assert_not_reached("Invalid watch type");
1348
1349         zero(its);
1350
1351         if (delay <= 0) {
1352                 /* Set absolute time in the past, but not 0, since we
1353                  * don't want to disarm the timer */
1354                 its.it_value.tv_sec = 0;
1355                 its.it_value.tv_nsec = 1;
1356
1357                 flags = TFD_TIMER_ABSTIME;
1358         } else {
1359                 timespec_store(&its.it_value, delay);
1360                 flags = 0;
1361         }
1362
1363         /* This will also flush the elapse counter */
1364         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1365                 goto fail;
1366
1367         if (w->type == WATCH_INVALID) {
1368                 struct epoll_event ev;
1369
1370                 zero(ev);
1371                 ev.data.ptr = w;
1372                 ev.events = EPOLLIN;
1373
1374                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1375                         goto fail;
1376         }
1377
1378         w->type = WATCH_UNIT_TIMER;
1379         w->fd = fd;
1380         w->data.unit = u;
1381
1382         return 0;
1383
1384 fail:
1385         if (ours)
1386                 close_nointr_nofail(fd);
1387
1388         return -errno;
1389 }
1390
1391 void unit_unwatch_timer(Unit *u, Watch *w) {
1392         assert(u);
1393         assert(w);
1394
1395         if (w->type == WATCH_INVALID)
1396                 return;
1397
1398         assert(w->type == WATCH_UNIT_TIMER);
1399         assert(w->data.unit == u);
1400         assert(w->fd >= 0);
1401
1402         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1403         close_nointr_nofail(w->fd);
1404
1405         w->fd = -1;
1406         w->type = WATCH_INVALID;
1407         w->data.unit = NULL;
1408 }
1409
1410 bool unit_job_is_applicable(Unit *u, JobType j) {
1411         assert(u);
1412         assert(j >= 0 && j < _JOB_TYPE_MAX);
1413
1414         switch (j) {
1415
1416         case JOB_VERIFY_ACTIVE:
1417         case JOB_START:
1418         case JOB_STOP:
1419                 return true;
1420
1421         case JOB_RESTART:
1422         case JOB_TRY_RESTART:
1423                 return unit_can_start(u);
1424
1425         case JOB_RELOAD:
1426                 return unit_can_reload(u);
1427
1428         case JOB_RELOAD_OR_START:
1429                 return unit_can_reload(u) && unit_can_start(u);
1430
1431         default:
1432                 assert_not_reached("Invalid job type");
1433         }
1434 }
1435
1436 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1437
1438         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1439                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1440                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1441                 [UNIT_WANTS] = UNIT_WANTED_BY,
1442                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1443                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1444                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1445                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1446                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1447                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1448                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1449                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1450                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1451                 [UNIT_BEFORE] = UNIT_AFTER,
1452                 [UNIT_AFTER] = UNIT_BEFORE,
1453                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1454                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1455                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1456         };
1457         int r, q = 0, v = 0, w = 0;
1458
1459         assert(u);
1460         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1461         assert(other);
1462
1463         u = unit_follow_merge(u);
1464         other = unit_follow_merge(other);
1465
1466         /* We won't allow dependencies on ourselves. We will not
1467          * consider them an error however. */
1468         if (u == other)
1469                 return 0;
1470
1471         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1472                 return r;
1473
1474         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1475                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1476                         return r;
1477
1478         if (add_reference)
1479                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1480                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1481                         return r;
1482
1483         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1484                 return q;
1485
1486         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1487                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1488                         r = v;
1489                         goto fail;
1490                 }
1491
1492         if (add_reference) {
1493                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1494                         r = w;
1495                         goto fail;
1496                 }
1497
1498                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1499                         goto fail;
1500         }
1501
1502         unit_add_to_dbus_queue(u);
1503         return 0;
1504
1505 fail:
1506         if (q > 0)
1507                 set_remove(u->meta.dependencies[d], other);
1508
1509         if (v > 0)
1510                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1511
1512         if (w > 0)
1513                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1514
1515         return r;
1516 }
1517
1518 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1519         int r;
1520
1521         assert(u);
1522
1523         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1524                 return r;
1525
1526         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1527                 return r;
1528
1529         return 0;
1530 }
1531
1532 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1533         char *s;
1534
1535         assert(u);
1536         assert(name || path);
1537
1538         if (!name)
1539                 name = file_name_from_path(path);
1540
1541         if (!unit_name_is_template(name)) {
1542                 *p = NULL;
1543                 return name;
1544         }
1545
1546         if (u->meta.instance)
1547                 s = unit_name_replace_instance(name, u->meta.instance);
1548         else {
1549                 char *i;
1550
1551                 if (!(i = unit_name_to_prefix(u->meta.id)))
1552                         return NULL;
1553
1554                 s = unit_name_replace_instance(name, i);
1555                 free(i);
1556         }
1557
1558         if (!s)
1559                 return NULL;
1560
1561         *p = s;
1562         return s;
1563 }
1564
1565 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1566         Unit *other;
1567         int r;
1568         char *s;
1569
1570         assert(u);
1571         assert(name || path);
1572
1573         if (!(name = resolve_template(u, name, path, &s)))
1574                 return -ENOMEM;
1575
1576         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1577                 goto finish;
1578
1579         r = unit_add_dependency(u, d, other, add_reference);
1580
1581 finish:
1582         free(s);
1583         return r;
1584 }
1585
1586 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1587         Unit *other;
1588         int r;
1589         char *s;
1590
1591         assert(u);
1592         assert(name || path);
1593
1594         if (!(name = resolve_template(u, name, path, &s)))
1595                 return -ENOMEM;
1596
1597         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1598                 goto finish;
1599
1600         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1601
1602 finish:
1603         free(s);
1604         return r;
1605 }
1606
1607 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1608         Unit *other;
1609         int r;
1610         char *s;
1611
1612         assert(u);
1613         assert(name || path);
1614
1615         if (!(name = resolve_template(u, name, path, &s)))
1616                 return -ENOMEM;
1617
1618         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1619                 goto finish;
1620
1621         r = unit_add_dependency(other, d, u, add_reference);
1622
1623 finish:
1624         free(s);
1625         return r;
1626 }
1627
1628 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1629         Unit *other;
1630         int r;
1631         char *s;
1632
1633         assert(u);
1634         assert(name || path);
1635
1636         if (!(name = resolve_template(u, name, path, &s)))
1637                 return -ENOMEM;
1638
1639         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1640                 goto finish;
1641
1642         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1643                 goto finish;
1644
1645 finish:
1646         free(s);
1647         return r;
1648 }
1649
1650 int set_unit_path(const char *p) {
1651         char *cwd, *c;
1652         int r;
1653
1654         /* This is mostly for debug purposes */
1655
1656         if (path_is_absolute(p)) {
1657                 if (!(c = strdup(p)))
1658                         return -ENOMEM;
1659         } else {
1660                 if (!(cwd = get_current_dir_name()))
1661                         return -errno;
1662
1663                 r = asprintf(&c, "%s/%s", cwd, p);
1664                 free(cwd);
1665
1666                 if (r < 0)
1667                         return -ENOMEM;
1668         }
1669
1670         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1671                 r = -errno;
1672                 free(c);
1673                 return r;
1674         }
1675
1676         return 0;
1677 }
1678
1679 char *unit_dbus_path(Unit *u) {
1680         char *p, *e;
1681
1682         assert(u);
1683
1684         if (!u->meta.id)
1685                 return NULL;
1686
1687         if (!(e = bus_path_escape(u->meta.id)))
1688                 return NULL;
1689
1690         p = strappend("/org/freedesktop/systemd1/unit/", e);
1691         free(e);
1692
1693         return p;
1694 }
1695
1696 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1697         int r;
1698
1699         assert(u);
1700         assert(b);
1701
1702         assert(b->path);
1703
1704         if (!b->controller)
1705                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1706                         return -ENOMEM;
1707
1708         /* Ensure this hasn't been added yet */
1709         assert(!b->unit);
1710
1711         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1712                 CGroupBonding *l;
1713
1714                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1715                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1716
1717                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1718                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1719                         return r;
1720                 }
1721         }
1722
1723         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1724         b->unit = u;
1725
1726         return 0;
1727 }
1728
1729 static char *default_cgroup_path(Unit *u) {
1730         char *p;
1731         int r;
1732
1733         assert(u);
1734
1735         if (u->meta.instance) {
1736                 char *t;
1737
1738                 if (!(t = unit_name_template(u->meta.id)))
1739                         return NULL;
1740
1741                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1742                 free(t);
1743         } else
1744                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1745
1746         return r < 0 ? NULL : p;
1747 }
1748
1749 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1750         char *controller = NULL, *path = NULL;
1751         CGroupBonding *b = NULL;
1752         int r;
1753
1754         assert(u);
1755         assert(name);
1756
1757         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1758                 return r;
1759
1760         if (!path)
1761                 path = default_cgroup_path(u);
1762
1763         if (!controller)
1764                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1765
1766         if (!path || !controller) {
1767                 free(path);
1768                 free(controller);
1769
1770                 return -ENOMEM;
1771         }
1772
1773         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1774                 r = -EEXIST;
1775                 goto fail;
1776         }
1777
1778         if (!(b = new0(CGroupBonding, 1))) {
1779                 r = -ENOMEM;
1780                 goto fail;
1781         }
1782
1783         b->controller = controller;
1784         b->path = path;
1785         b->ours = false;
1786
1787         if ((r = unit_add_cgroup(u, b)) < 0)
1788                 goto fail;
1789
1790         return 0;
1791
1792 fail:
1793         free(path);
1794         free(controller);
1795         free(b);
1796
1797         return r;
1798 }
1799
1800 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1801         CGroupBonding *b = NULL;
1802         int r = -ENOMEM;
1803
1804         assert(u);
1805
1806         if (!controller)
1807                 controller = SYSTEMD_CGROUP_CONTROLLER;
1808
1809         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1810                 return 0;
1811
1812         if (!(b = new0(CGroupBonding, 1)))
1813                 return -ENOMEM;
1814
1815         if (!(b->controller = strdup(controller)))
1816                 goto fail;
1817
1818         if (!(b->path = default_cgroup_path(u)))
1819                 goto fail;
1820
1821         b->ours = true;
1822         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1823
1824         if ((r = unit_add_cgroup(u, b)) < 0)
1825                 goto fail;
1826
1827         return 0;
1828
1829 fail:
1830         free(b->path);
1831         free(b->controller);
1832         free(b);
1833
1834         return r;
1835 }
1836
1837 int unit_add_default_cgroups(Unit *u) {
1838         char **c;
1839         int r;
1840         assert(u);
1841
1842         /* Adds in the default cgroups, if they weren't specified
1843          * otherwise. */
1844
1845         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1846                 return r;
1847
1848         STRV_FOREACH(c, u->meta.manager->default_controllers)
1849                 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1850                         return r;
1851
1852         return 0;
1853 }
1854
1855 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1856         assert(u);
1857
1858         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1859 }
1860
1861 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1862         char *t;
1863         int r;
1864
1865         assert(u);
1866         assert(type);
1867         assert(_found);
1868
1869         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1870                 return -ENOMEM;
1871
1872         assert(!unit_has_name(u, t));
1873
1874         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1875         free(t);
1876
1877         assert(r < 0 || *_found != u);
1878
1879         return r;
1880 }
1881
1882 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1883         Unit *found;
1884         char *t;
1885
1886         assert(u);
1887         assert(type);
1888         assert(_found);
1889
1890         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1891                 return -ENOMEM;
1892
1893         assert(!unit_has_name(u, t));
1894
1895         found = manager_get_unit(u->meta.manager, t);
1896         free(t);
1897
1898         if (!found)
1899                 return -ENOENT;
1900
1901         *_found = found;
1902         return 0;
1903 }
1904
1905 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1906         Unit *u = userdata;
1907         assert(u);
1908
1909         return unit_name_to_prefix_and_instance(u->meta.id);
1910 }
1911
1912 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1913         Unit *u = userdata;
1914         assert(u);
1915
1916         return unit_name_to_prefix(u->meta.id);
1917 }
1918
1919 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1920         Unit *u = userdata;
1921         char *p, *r;
1922
1923         assert(u);
1924
1925         if (!(p = unit_name_to_prefix(u->meta.id)))
1926                 return NULL;
1927
1928         r = unit_name_unescape(p);
1929         free(p);
1930
1931         return r;
1932 }
1933
1934 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1935         Unit *u = userdata;
1936         assert(u);
1937
1938         if (u->meta.instance)
1939                 return unit_name_unescape(u->meta.instance);
1940
1941         return strdup("");
1942 }
1943
1944 static char *specifier_filename(char specifier, void *data, void *userdata) {
1945         Unit *u = userdata;
1946         assert(u);
1947
1948         if (u->meta.instance)
1949                 return unit_name_path_unescape(u->meta.instance);
1950
1951         return unit_name_to_path(u->meta.instance);
1952 }
1953
1954 char *unit_name_printf(Unit *u, const char* format) {
1955
1956         /*
1957          * This will use the passed string as format string and
1958          * replace the following specifiers:
1959          *
1960          * %n: the full id of the unit                 (foo@bar.waldo)
1961          * %N: the id of the unit without the suffix   (foo@bar)
1962          * %p: the prefix                              (foo)
1963          * %i: the instance                            (bar)
1964          */
1965
1966         const Specifier table[] = {
1967                 { 'n', specifier_string,              u->meta.id },
1968                 { 'N', specifier_prefix_and_instance, NULL },
1969                 { 'p', specifier_prefix,              NULL },
1970                 { 'i', specifier_string,              u->meta.instance },
1971                 { 0, NULL, NULL }
1972         };
1973
1974         assert(u);
1975         assert(format);
1976
1977         return specifier_printf(format, table, u);
1978 }
1979
1980 char *unit_full_printf(Unit *u, const char *format) {
1981
1982         /* This is similar to unit_name_printf() but also supports
1983          * unescaping */
1984
1985         const Specifier table[] = {
1986                 { 'n', specifier_string,              u->meta.id },
1987                 { 'N', specifier_prefix_and_instance, NULL },
1988                 { 'p', specifier_prefix,              NULL },
1989                 { 'P', specifier_prefix_unescaped,    NULL },
1990                 { 'i', specifier_string,              u->meta.instance },
1991                 { 'I', specifier_instance_unescaped,  NULL },
1992                 { 'f', specifier_filename,            NULL },
1993                 { 0, NULL, NULL }
1994         };
1995
1996         assert(u);
1997         assert(format);
1998
1999         return specifier_printf(format, table, u);
2000 }
2001
2002 char **unit_full_printf_strv(Unit *u, char **l) {
2003         size_t n;
2004         char **r, **i, **j;
2005
2006         /* Applies unit_full_printf to every entry in l */
2007
2008         assert(u);
2009
2010         n = strv_length(l);
2011         if (!(r = new(char*, n+1)))
2012                 return NULL;
2013
2014         for (i = l, j = r; *i; i++, j++)
2015                 if (!(*j = unit_full_printf(u, *i)))
2016                         goto fail;
2017
2018         *j = NULL;
2019         return r;
2020
2021 fail:
2022         j--;
2023         while (j >= r)
2024                 free(*j);
2025
2026         free(r);
2027
2028         return NULL;
2029 }
2030
2031 int unit_watch_bus_name(Unit *u, const char *name) {
2032         assert(u);
2033         assert(name);
2034
2035         /* Watch a specific name on the bus. We only support one unit
2036          * watching each name for now. */
2037
2038         return hashmap_put(u->meta.manager->watch_bus, name, u);
2039 }
2040
2041 void unit_unwatch_bus_name(Unit *u, const char *name) {
2042         assert(u);
2043         assert(name);
2044
2045         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2046 }
2047
2048 bool unit_can_serialize(Unit *u) {
2049         assert(u);
2050
2051         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2052 }
2053
2054 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2055         int r;
2056
2057         assert(u);
2058         assert(f);
2059         assert(fds);
2060
2061         if (!unit_can_serialize(u))
2062                 return 0;
2063
2064         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2065                 return r;
2066
2067         if (u->meta.job)
2068                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2069
2070         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2071         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2072         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2073         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2074
2075         /* End marker */
2076         fputc('\n', f);
2077         return 0;
2078 }
2079
2080 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2081         va_list ap;
2082
2083         assert(u);
2084         assert(f);
2085         assert(key);
2086         assert(format);
2087
2088         fputs(key, f);
2089         fputc('=', f);
2090
2091         va_start(ap, format);
2092         vfprintf(f, format, ap);
2093         va_end(ap);
2094
2095         fputc('\n', f);
2096 }
2097
2098 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2099         assert(u);
2100         assert(f);
2101         assert(key);
2102         assert(value);
2103
2104         fprintf(f, "%s=%s\n", key, value);
2105 }
2106
2107 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2108         int r;
2109
2110         assert(u);
2111         assert(f);
2112         assert(fds);
2113
2114         if (!unit_can_serialize(u))
2115                 return 0;
2116
2117         for (;;) {
2118                 char line[1024], *l, *v;
2119                 size_t k;
2120
2121                 if (!fgets(line, sizeof(line), f)) {
2122                         if (feof(f))
2123                                 return 0;
2124                         return -errno;
2125                 }
2126
2127                 char_array_0(line);
2128                 l = strstrip(line);
2129
2130                 /* End marker */
2131                 if (l[0] == 0)
2132                         return 0;
2133
2134                 k = strcspn(l, "=");
2135
2136                 if (l[k] == '=') {
2137                         l[k] = 0;
2138                         v = l+k+1;
2139                 } else
2140                         v = l+k;
2141
2142                 if (streq(l, "job")) {
2143                         JobType type;
2144
2145                         if ((type = job_type_from_string(v)) < 0)
2146                                 log_debug("Failed to parse job type value %s", v);
2147                         else
2148                                 u->meta.deserialized_job = type;
2149
2150                         continue;
2151                 } else if (streq(l, "inactive-exit-timestamp")) {
2152                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2153                         continue;
2154                 } else if (streq(l, "active-enter-timestamp")) {
2155                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2156                         continue;
2157                 } else if (streq(l, "active-exit-timestamp")) {
2158                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2159                         continue;
2160                 } else if (streq(l, "inactive-enter-timestamp")) {
2161                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2162                         continue;
2163                 }
2164
2165                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2166                         return r;
2167         }
2168 }
2169
2170 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2171         Unit *device;
2172         char *e;
2173         int r;
2174
2175         assert(u);
2176
2177         if (!what)
2178                 return 0;
2179
2180         /* Adds in links to the device node that this unit is based on */
2181
2182         if (!is_device_path(what))
2183                 return 0;
2184
2185         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2186                 return -ENOMEM;
2187
2188         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2189         free(e);
2190
2191         if (r < 0)
2192                 return r;
2193
2194         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2195                 return r;
2196
2197         if (wants)
2198                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2199                         return r;
2200
2201         return 0;
2202 }
2203
2204 int unit_coldplug(Unit *u) {
2205         int r;
2206
2207         assert(u);
2208
2209         if (UNIT_VTABLE(u)->coldplug)
2210                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2211                         return r;
2212
2213         if (u->meta.deserialized_job >= 0) {
2214                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2215                         return r;
2216
2217                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2218         }
2219
2220         return 0;
2221 }
2222
2223 void unit_status_printf(Unit *u, const char *format, ...) {
2224         va_list ap;
2225
2226         assert(u);
2227         assert(format);
2228
2229         if (!UNIT_VTABLE(u)->show_status)
2230                 return;
2231
2232         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2233                 return;
2234
2235         if (!u->meta.manager->show_status)
2236                 return;
2237
2238         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2239                 return;
2240
2241         va_start(ap, format);
2242         status_vprintf(format, ap);
2243         va_end(ap);
2244 }
2245
2246 bool unit_need_daemon_reload(Unit *u) {
2247         struct stat st;
2248
2249         assert(u);
2250
2251         if (!u->meta.fragment_path)
2252                 return false;
2253
2254         zero(st);
2255         if (stat(u->meta.fragment_path, &st) < 0)
2256                 /* What, cannot access this anymore? */
2257                 return true;
2258
2259         return
2260                 u->meta.fragment_mtime &&
2261                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2262 }
2263
2264 void unit_reset_failed(Unit *u) {
2265         assert(u);
2266
2267         if (UNIT_VTABLE(u)->reset_failed)
2268                 UNIT_VTABLE(u)->reset_failed(u);
2269 }
2270
2271 Unit *unit_following(Unit *u) {
2272         assert(u);
2273
2274         if (UNIT_VTABLE(u)->following)
2275                 return UNIT_VTABLE(u)->following(u);
2276
2277         return NULL;
2278 }
2279
2280 bool unit_pending_inactive(Unit *u) {
2281         assert(u);
2282
2283         /* Returns true if the unit is inactive or going down */
2284
2285         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2286                 return true;
2287
2288         if (u->meta.job && u->meta.job->type == JOB_STOP)
2289                 return true;
2290
2291         return false;
2292 }
2293
2294 bool unit_pending_active(Unit *u) {
2295         assert(u);
2296
2297         /* Returns true if the unit is inactive or going down */
2298
2299         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2300                 return true;
2301
2302         if (u->meta.job &&
2303             (u->meta.job->type == JOB_START ||
2304              u->meta.job->type == JOB_RELOAD_OR_START ||
2305              u->meta.job->type == JOB_RESTART))
2306                 return true;
2307
2308         return false;
2309 }
2310
2311 UnitType unit_name_to_type(const char *n) {
2312         UnitType t;
2313
2314         assert(n);
2315
2316         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2317                 if (endswith(n, unit_vtable[t]->suffix))
2318                         return t;
2319
2320         return _UNIT_TYPE_INVALID;
2321 }
2322
2323 bool unit_name_is_valid(const char *n, bool template_ok) {
2324         UnitType t;
2325
2326         t = unit_name_to_type(n);
2327         if (t < 0 || t >= _UNIT_TYPE_MAX)
2328                 return false;
2329
2330         return unit_name_is_valid_no_type(n, template_ok);
2331 }
2332
2333 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2334         assert(u);
2335         assert(w >= 0 && w < _KILL_WHO_MAX);
2336         assert(m >= 0 && m < _KILL_MODE_MAX);
2337         assert(signo > 0);
2338         assert(signo < _NSIG);
2339
2340         if (m == KILL_NONE)
2341                 return 0;
2342
2343         if (!UNIT_VTABLE(u)->kill)
2344                 return -ENOTSUP;
2345
2346         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2347 }
2348
2349
2350 int unit_following_set(Unit *u, Set **s) {
2351         assert(u);
2352         assert(s);
2353
2354         if (UNIT_VTABLE(u)->following_set)
2355                 return UNIT_VTABLE(u)->following_set(u, s);
2356
2357         *s = NULL;
2358         return 0;
2359 }
2360
2361 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2362         [UNIT_STUB] = "stub",
2363         [UNIT_LOADED] = "loaded",
2364         [UNIT_ERROR] = "error",
2365         [UNIT_MERGED] = "merged",
2366         [UNIT_MASKED] = "masked"
2367 };
2368
2369 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2370
2371 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2372         [UNIT_ACTIVE] = "active",
2373         [UNIT_RELOADING] = "reloading",
2374         [UNIT_INACTIVE] = "inactive",
2375         [UNIT_FAILED] = "failed",
2376         [UNIT_ACTIVATING] = "activating",
2377         [UNIT_DEACTIVATING] = "deactivating"
2378 };
2379
2380 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2381
2382 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2383         [UNIT_REQUIRES] = "Requires",
2384         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2385         [UNIT_WANTS] = "Wants",
2386         [UNIT_REQUISITE] = "Requisite",
2387         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2388         [UNIT_REQUIRED_BY] = "RequiredBy",
2389         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2390         [UNIT_BIND_TO] = "BindTo",
2391         [UNIT_WANTED_BY] = "WantedBy",
2392         [UNIT_CONFLICTS] = "Conflicts",
2393         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2394         [UNIT_BOUND_BY] = "BoundBy",
2395         [UNIT_BEFORE] = "Before",
2396         [UNIT_AFTER] = "After",
2397         [UNIT_REFERENCES] = "References",
2398         [UNIT_REFERENCED_BY] = "ReferencedBy",
2399         [UNIT_ON_FAILURE] = "OnFailure"
2400 };
2401
2402 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);