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_error != EXEC_OUTPUT_KMSG &&
 560             c->std_error != EXEC_OUTPUT_SYSLOG)
 561                 return 0;
 562
 563         /* If syslog or kernel logging is requested, make sure our own
 564          * logging daemon is run first. */
 565
 566         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 567                 return r;
 568
 569         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 570                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 571                         return r;
 572
 573         return 0;
 574 }
 575
 576 const char *unit_description(Unit *u) {
 577         assert(u);
 578
 579         if (u->meta.description)
 580                 return u->meta.description;
 581
 582         return strna(u->meta.id);
 583 }
 584
 585 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 586         char *t;
 587         UnitDependency d;
 588         Iterator i;
 589         char *p2;
 590         const char *prefix2;
 591         CGroupBonding *b;
 592         char
 593                 timestamp1[FORMAT_TIMESTAMP_MAX],
 594                 timestamp2[FORMAT_TIMESTAMP_MAX],
 595                 timestamp3[FORMAT_TIMESTAMP_MAX],
 596                 timestamp4[FORMAT_TIMESTAMP_MAX],
 597                 timespan[FORMAT_TIMESPAN_MAX];
 598         Unit *following;
 599
 600         assert(u);
 601         assert(u->meta.type >= 0);
 602
 603         if (!prefix)
 604                 prefix = "";
 605         p2 = strappend(prefix, "\t");
 606         prefix2 = p2 ? p2 : prefix;
 607
 608         fprintf(f,
 609                 "%s-> Unit %s:\n"
 610                 "%s\tDescription: %s\n"
 611                 "%s\tInstance: %s\n"
 612                 "%s\tUnit Load State: %s\n"
 613                 "%s\tUnit Active State: %s\n"
 614                 "%s\tInactive Exit Timestamp: %s\n"
 615                 "%s\tActive Enter Timestamp: %s\n"
 616                 "%s\tActive Exit Timestamp: %s\n"
 617                 "%s\tInactive Enter Timestamp: %s\n"
 618                 "%s\tGC Check Good: %s\n"
 619                 "%s\tNeed Daemon Reload: %s\n",
 620                 prefix, u->meta.id,
 621                 prefix, unit_description(u),
 622                 prefix, strna(u->meta.instance),
 623                 prefix, unit_load_state_to_string(u->meta.load_state),
 624                 prefix, unit_active_state_to_string(unit_active_state(u)),
 625                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 626                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 627                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 628                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 629                 prefix, yes_no(unit_check_gc(u)),
 630                 prefix, yes_no(unit_need_daemon_reload(u)));
 631
 632         SET_FOREACH(t, u->meta.names, i)
 633                 fprintf(f, "%s\tName: %s\n", prefix, t);
 634
 635         if ((following = unit_following(u)))
 636                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 637
 638         if (u->meta.fragment_path)
 639                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 640
 641         if (u->meta.job_timeout > 0)
 642                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 643
 644         condition_dump_list(u->meta.conditions, f, prefix);
 645
 646         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 647                 Unit *other;
 648
 649                 SET_FOREACH(other, u->meta.dependencies[d], i)
 650                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 651         }
 652
 653         if (u->meta.load_state == UNIT_LOADED) {
 654                 fprintf(f,
 655                         "%s\tStopRetroactively: %s\n"
 656                         "%s\tStopWhenUnneeded: %s\n"
 657                         "%s\tRefuseManualStart: %s\n"
 658                         "%s\tRefuseManualStop: %s\n"
 659                         "%s\tDefaultDependencies: %s\n"
 660                         "%s\tIgnoreDependencyFailure: %s\n",
 661                         prefix, yes_no(u->meta.stop_retroactively),
 662                         prefix, yes_no(u->meta.stop_when_unneeded),
 663                         prefix, yes_no(u->meta.refuse_manual_start),
 664                         prefix, yes_no(u->meta.refuse_manual_stop),
 665                         prefix, yes_no(u->meta.default_dependencies),
 666                         prefix, yes_no(u->meta.ignore_dependency_failure));
 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 boths 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         /* Don't create loops */
 746         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 747                 return 0;
 748
 749         return unit_add_dependency(target, UNIT_AFTER, u, true);
 750 }
 751
 752 static int unit_add_default_dependencies(Unit *u) {
 753         Unit *target;
 754         Iterator i;
 755         int r;
 756
 757         assert(u);
 758
 759         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 760                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 761                         return r;
 762
 763         SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 764                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 765                         return r;
 766
 767         SET_FOREACH(target, u->meta.dependencies[UNIT_WANTED_BY], i)
 768                 if ((r = unit_add_default_target_dependency(u, target)) < 0)
 769                         return r;
 770
 771         return 0;
 772 }
 773
 774 int unit_load(Unit *u) {
 775         int r;
 776
 777         assert(u);
 778
 779         if (u->meta.in_load_queue) {
 780                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 781                 u->meta.in_load_queue = false;
 782         }
 783
 784         if (u->meta.type == _UNIT_TYPE_INVALID)
 785                 return -EINVAL;
 786
 787         if (u->meta.load_state != UNIT_STUB)
 788                 return 0;
 789
 790         if (UNIT_VTABLE(u)->load)
 791                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 792                         goto fail;
 793
 794         if (u->meta.load_state == UNIT_STUB) {
 795                 r = -ENOENT;
 796                 goto fail;
 797         }
 798
 799         if (u->meta.load_state == UNIT_LOADED &&
 800             u->meta.default_dependencies)
 801                 if ((r = unit_add_default_dependencies(u)) < 0)
 802                         goto fail;
 803
 804         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 805
 806         unit_add_to_dbus_queue(unit_follow_merge(u));
 807         unit_add_to_gc_queue(u);
 808
 809         return 0;
 810
 811 fail:
 812         u->meta.load_state = UNIT_ERROR;
 813         u->meta.load_error = r;
 814         unit_add_to_dbus_queue(u);
 815
 816         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 817
 818         return r;
 819 }
 820
 821 /* Errors:
 822  *         -EBADR:     This unit type does not support starting.
 823  *         -EALREADY:  Unit is already started.
 824  *         -EAGAIN:    An operation is already in progress. Retry later.
 825  *         -ECANCELED: Too many requests for now.
 826  */
 827 int unit_start(Unit *u) {
 828         UnitActiveState state;
 829
 830         assert(u);
 831
 832         if (u->meta.load_state != UNIT_LOADED)
 833                 return -EINVAL;
 834
 835         /* If this is already (being) started, then this will
 836          * succeed. Note that this will even succeed if this unit is
 837          * not startable by the user. This is relied on to detect when
 838          * we need to wait for units and when waiting is finished. */
 839         state = unit_active_state(u);
 840         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 841                 return -EALREADY;
 842
 843         /* If it is stopped, but we cannot start it, then fail */
 844         if (!UNIT_VTABLE(u)->start)
 845                 return -EBADR;
 846
 847         /* If the conditions failed, don't do anything at all */
 848         if (!condition_test_list(u->meta.conditions)) {
 849                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 850                 return -EALREADY;
 851         }
 852
 853         /* We don't suppress calls to ->start() here when we are
 854          * already starting, to allow this request to be used as a
 855          * "hurry up" call, for example when the unit is in some "auto
 856          * restart" state where it waits for a holdoff timer to elapse
 857          * before it will start again. */
 858
 859         unit_add_to_dbus_queue(u);
 860
 861         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 862
 863         return UNIT_VTABLE(u)->start(u);
 864 }
 865
 866 bool unit_can_start(Unit *u) {
 867         assert(u);
 868
 869         return !!UNIT_VTABLE(u)->start;
 870 }
 871
 872 bool unit_can_isolate(Unit *u) {
 873         assert(u);
 874
 875         return unit_can_start(u) &&
 876                 u->meta.allow_isolate;
 877 }
 878
 879 /* Errors:
 880  *         -EBADR:    This unit type does not support stopping.
 881  *         -EALREADY: Unit is already stopped.
 882  *         -EAGAIN:   An operation is already in progress. Retry later.
 883  */
 884 int unit_stop(Unit *u) {
 885         UnitActiveState state;
 886
 887         assert(u);
 888
 889         state = unit_active_state(u);
 890         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 891                 return -EALREADY;
 892
 893         if (!UNIT_VTABLE(u)->stop)
 894                 return -EBADR;
 895
 896         unit_add_to_dbus_queue(u);
 897
 898         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 899
 900         return UNIT_VTABLE(u)->stop(u);
 901 }
 902
 903 /* Errors:
 904  *         -EBADR:    This unit type does not support reloading.
 905  *         -ENOEXEC:  Unit is not started.
 906  *         -EAGAIN:   An operation is already in progress. Retry later.
 907  */
 908 int unit_reload(Unit *u) {
 909         UnitActiveState state;
 910
 911         assert(u);
 912
 913         if (u->meta.load_state != UNIT_LOADED)
 914                 return -EINVAL;
 915
 916         if (!unit_can_reload(u))
 917                 return -EBADR;
 918
 919         state = unit_active_state(u);
 920         if (state == UNIT_RELOADING)
 921                 return -EALREADY;
 922
 923         if (state != UNIT_ACTIVE)
 924                 return -ENOEXEC;
 925
 926         unit_add_to_dbus_queue(u);
 927         return UNIT_VTABLE(u)->reload(u);
 928 }
 929
 930 bool unit_can_reload(Unit *u) {
 931         assert(u);
 932
 933         if (!UNIT_VTABLE(u)->reload)
 934                 return false;
 935
 936         if (!UNIT_VTABLE(u)->can_reload)
 937                 return true;
 938
 939         return UNIT_VTABLE(u)->can_reload(u);
 940 }
 941
 942 static void unit_check_unneeded(Unit *u) {
 943         Iterator i;
 944         Unit *other;
 945
 946         assert(u);
 947
 948         /* If this service shall be shut down when unneeded then do
 949          * so. */
 950
 951         if (!u->meta.stop_when_unneeded)
 952                 return;
 953
 954         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 955                 return;
 956
 957         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 958                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 959                         return;
 960
 961         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 962                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 963                         return;
 964
 965         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 966                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 967                         return;
 968
 969         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
 970
 971         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 972         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
 973 }
 974
 975 static void retroactively_start_dependencies(Unit *u) {
 976         Iterator i;
 977         Unit *other;
 978
 979         assert(u);
 980         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 981
 982         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 983                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 984                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 985
 986         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
 987                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 988                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 989
 990         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 991                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 992                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
 993
 994         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 995                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 996                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
 997
 998         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 999                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1000                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1001
1002         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1003                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1004                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1005 }
1006
1007 static void retroactively_stop_dependencies(Unit *u) {
1008         Iterator i;
1009         Unit *other;
1010
1011         assert(u);
1012         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1013
1014         /* Pull down units which need us recursively if enabled */
1015         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1016                 if (other->meta.stop_retroactively &&
1017                     !UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1019
1020         /* Garbage collect services that might not be needed anymore, if enabled */
1021         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1022                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1023                         unit_check_unneeded(other);
1024         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1025                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1026                         unit_check_unneeded(other);
1027         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1028                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1029                         unit_check_unneeded(other);
1030         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1031                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1032                         unit_check_unneeded(other);
1033         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1034                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1035                         unit_check_unneeded(other);
1036 }
1037
1038 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1039         dual_timestamp ts;
1040         bool unexpected;
1041
1042         assert(u);
1043         assert(os < _UNIT_ACTIVE_STATE_MAX);
1044         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1045
1046         /* Note that this is called for all low-level state changes,
1047          * even if they might map to the same high-level
1048          * UnitActiveState! That means that ns == os is OK an expected
1049          * behaviour here. For example: if a mount point is remounted
1050          * this function will be called too! */
1051
1052         dual_timestamp_get(&ts);
1053
1054         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1055                 u->meta.inactive_exit_timestamp = ts;
1056         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1057                 u->meta.inactive_enter_timestamp = ts;
1058
1059         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1060                 u->meta.active_enter_timestamp = ts;
1061         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1062                 u->meta.active_exit_timestamp = ts;
1063
1064         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1065                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1066
1067         timer_unit_notify(u, ns);
1068         path_unit_notify(u, ns);
1069
1070         if (u->meta.job) {
1071                 unexpected = false;
1072
1073                 if (u->meta.job->state == JOB_WAITING)
1074
1075                         /* So we reached a different state for this
1076                          * job. Let's see if we can run it now if it
1077                          * failed previously due to EAGAIN. */
1078                         job_add_to_run_queue(u->meta.job);
1079
1080                 /* Let's check whether this state change constitutes a
1081                  * finished job, or maybe cotradicts a running job and
1082                  * hence needs to invalidate jobs. */
1083
1084                 switch (u->meta.job->type) {
1085
1086                 case JOB_START:
1087                 case JOB_VERIFY_ACTIVE:
1088
1089                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1090                                 job_finish_and_invalidate(u->meta.job, true);
1091                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1092                                 unexpected = true;
1093
1094                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1095                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1096                         }
1097
1098                         break;
1099
1100                 case JOB_RELOAD:
1101                 case JOB_RELOAD_OR_START:
1102
1103                         if (u->meta.job->state == JOB_RUNNING) {
1104                                 if (ns == UNIT_ACTIVE)
1105                                         job_finish_and_invalidate(u->meta.job, true);
1106                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1107                                         unexpected = true;
1108
1109                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1110                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1111                                 }
1112                         }
1113
1114                         break;
1115
1116                 case JOB_STOP:
1117                 case JOB_RESTART:
1118                 case JOB_TRY_RESTART:
1119
1120                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1121                                 job_finish_and_invalidate(u->meta.job, true);
1122                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1123                                 unexpected = true;
1124                                 job_finish_and_invalidate(u->meta.job, false);
1125                         }
1126
1127                         break;
1128
1129                 default:
1130                         assert_not_reached("Job type unknown");
1131                 }
1132
1133         } else
1134                 unexpected = true;
1135
1136         /* If this state change happened without being requested by a
1137          * job, then let's retroactively start or stop
1138          * dependencies. We skip that step when deserializing, since
1139          * we don't want to create any additional jobs just because
1140          * something is already activated. */
1141
1142         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1143                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1144                         retroactively_start_dependencies(u);
1145                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1146                         retroactively_stop_dependencies(u);
1147         }
1148
1149         if (ns != os && ns == UNIT_FAILED) {
1150                 Iterator i;
1151                 Unit *other;
1152
1153                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1154                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1155
1156                 log_notice("Unit %s entered failed state.", u->meta.id);
1157         }
1158
1159         /* Some names are special */
1160         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1161                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1162                         /* The bus just might have become available,
1163                          * hence try to connect to it, if we aren't
1164                          * yet connected. */
1165                         bus_init(u->meta.manager);
1166
1167                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1168                         /* The syslog daemon just might have become
1169                          * available, hence try to connect to it, if
1170                          * we aren't yet connected. */
1171                         log_open();
1172
1173                 if (u->meta.type == UNIT_SERVICE &&
1174                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1175                         /* Write audit record if we have just finished starting up */
1176                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1177                         u->meta.in_audit = true;
1178                 }
1179
1180                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1181                         manager_send_unit_plymouth(u->meta.manager, u);
1182
1183         } else {
1184
1185                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1186                         /* The syslog daemon might just have
1187                          * terminated, hence try to disconnect from
1188                          * it. */
1189                         log_close_syslog();
1190
1191                 /* We don't care about D-Bus here, since we'll get an
1192                  * asynchronous notification for it anyway. */
1193
1194                 if (u->meta.type == UNIT_SERVICE &&
1195                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1196                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1197
1198                         /* Hmm, if there was no start record written
1199                          * write it now, so that we always have a nice
1200                          * pair */
1201                         if (!u->meta.in_audit) {
1202                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1203
1204                                 if (ns == UNIT_INACTIVE)
1205                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1206                         } else
1207                                 /* Write audit record if we have just finished shutting down */
1208                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1209
1210                         u->meta.in_audit = false;
1211                 }
1212         }
1213
1214         /* Maybe we finished startup and are now ready for being
1215          * stopped because unneeded? */
1216         unit_check_unneeded(u);
1217
1218         unit_add_to_dbus_queue(u);
1219         unit_add_to_gc_queue(u);
1220 }
1221
1222 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1223         struct epoll_event ev;
1224
1225         assert(u);
1226         assert(fd >= 0);
1227         assert(w);
1228         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1229
1230         zero(ev);
1231         ev.data.ptr = w;
1232         ev.events = events;
1233
1234         if (epoll_ctl(u->meta.manager->epoll_fd,
1235                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1236                       fd,
1237                       &ev) < 0)
1238                 return -errno;
1239
1240         w->fd = fd;
1241         w->type = WATCH_FD;
1242         w->data.unit = u;
1243
1244         return 0;
1245 }
1246
1247 void unit_unwatch_fd(Unit *u, Watch *w) {
1248         assert(u);
1249         assert(w);
1250
1251         if (w->type == WATCH_INVALID)
1252                 return;
1253
1254         assert(w->type == WATCH_FD);
1255         assert(w->data.unit == u);
1256         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1257
1258         w->fd = -1;
1259         w->type = WATCH_INVALID;
1260         w->data.unit = NULL;
1261 }
1262
1263 int unit_watch_pid(Unit *u, pid_t pid) {
1264         assert(u);
1265         assert(pid >= 1);
1266
1267         /* Watch a specific PID. We only support one unit watching
1268          * each PID for now. */
1269
1270         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1271 }
1272
1273 void unit_unwatch_pid(Unit *u, pid_t pid) {
1274         assert(u);
1275         assert(pid >= 1);
1276
1277         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1278 }
1279
1280 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1281         struct itimerspec its;
1282         int flags, fd;
1283         bool ours;
1284
1285         assert(u);
1286         assert(w);
1287         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1288
1289         /* This will try to reuse the old timer if there is one */
1290
1291         if (w->type == WATCH_UNIT_TIMER) {
1292                 assert(w->data.unit == u);
1293                 assert(w->fd >= 0);
1294
1295                 ours = false;
1296                 fd = w->fd;
1297         } else if (w->type == WATCH_INVALID) {
1298
1299                 ours = true;
1300                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1301                         return -errno;
1302         } else
1303                 assert_not_reached("Invalid watch type");
1304
1305         zero(its);
1306
1307         if (delay <= 0) {
1308                 /* Set absolute time in the past, but not 0, since we
1309                  * don't want to disarm the timer */
1310                 its.it_value.tv_sec = 0;
1311                 its.it_value.tv_nsec = 1;
1312
1313                 flags = TFD_TIMER_ABSTIME;
1314         } else {
1315                 timespec_store(&its.it_value, delay);
1316                 flags = 0;
1317         }
1318
1319         /* This will also flush the elapse counter */
1320         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1321                 goto fail;
1322
1323         if (w->type == WATCH_INVALID) {
1324                 struct epoll_event ev;
1325
1326                 zero(ev);
1327                 ev.data.ptr = w;
1328                 ev.events = EPOLLIN;
1329
1330                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1331                         goto fail;
1332         }
1333
1334         w->type = WATCH_UNIT_TIMER;
1335         w->fd = fd;
1336         w->data.unit = u;
1337
1338         return 0;
1339
1340 fail:
1341         if (ours)
1342                 close_nointr_nofail(fd);
1343
1344         return -errno;
1345 }
1346
1347 void unit_unwatch_timer(Unit *u, Watch *w) {
1348         assert(u);
1349         assert(w);
1350
1351         if (w->type == WATCH_INVALID)
1352                 return;
1353
1354         assert(w->type == WATCH_UNIT_TIMER);
1355         assert(w->data.unit == u);
1356         assert(w->fd >= 0);
1357
1358         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1359         close_nointr_nofail(w->fd);
1360
1361         w->fd = -1;
1362         w->type = WATCH_INVALID;
1363         w->data.unit = NULL;
1364 }
1365
1366 bool unit_job_is_applicable(Unit *u, JobType j) {
1367         assert(u);
1368         assert(j >= 0 && j < _JOB_TYPE_MAX);
1369
1370         switch (j) {
1371
1372         case JOB_VERIFY_ACTIVE:
1373         case JOB_START:
1374                 return true;
1375
1376         case JOB_STOP:
1377         case JOB_RESTART:
1378         case JOB_TRY_RESTART:
1379                 return unit_can_start(u);
1380
1381         case JOB_RELOAD:
1382                 return unit_can_reload(u);
1383
1384         case JOB_RELOAD_OR_START:
1385                 return unit_can_reload(u) && unit_can_start(u);
1386
1387         default:
1388                 assert_not_reached("Invalid job type");
1389         }
1390 }
1391
1392 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1393
1394         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1395                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1396                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1397                 [UNIT_WANTS] = UNIT_WANTED_BY,
1398                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1399                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1400                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1401                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1402                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1403                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1404                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1405                 [UNIT_BEFORE] = UNIT_AFTER,
1406                 [UNIT_AFTER] = UNIT_BEFORE,
1407                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1408                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1409                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1410         };
1411         int r, q = 0, v = 0, w = 0;
1412
1413         assert(u);
1414         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1415         assert(other);
1416
1417         u = unit_follow_merge(u);
1418         other = unit_follow_merge(other);
1419
1420         /* We won't allow dependencies on ourselves. We will not
1421          * consider them an error however. */
1422         if (u == other)
1423                 return 0;
1424
1425         if (UNIT_VTABLE(u)->no_requires &&
1426             (d == UNIT_REQUIRES ||
1427              d == UNIT_REQUIRES_OVERRIDABLE ||
1428              d == UNIT_REQUISITE ||
1429              d == UNIT_REQUISITE_OVERRIDABLE)) {
1430                     return -EINVAL;
1431         }
1432
1433         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1434                 return r;
1435
1436         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1437                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1438                         return r;
1439
1440         if (add_reference)
1441                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1442                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1443                         return r;
1444
1445         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1446                 return q;
1447
1448         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1449                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1450                         r = v;
1451                         goto fail;
1452                 }
1453
1454         if (add_reference) {
1455                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1456                         r = w;
1457                         goto fail;
1458                 }
1459
1460                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1461                         goto fail;
1462         }
1463
1464         unit_add_to_dbus_queue(u);
1465         return 0;
1466
1467 fail:
1468         if (q > 0)
1469                 set_remove(u->meta.dependencies[d], other);
1470
1471         if (v > 0)
1472                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1473
1474         if (w > 0)
1475                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1476
1477         return r;
1478 }
1479
1480 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1481         int r;
1482
1483         assert(u);
1484
1485         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1486                 return r;
1487
1488         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1489                 return r;
1490
1491         return 0;
1492 }
1493
1494 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1495         char *s;
1496
1497         assert(u);
1498         assert(name || path);
1499
1500         if (!name)
1501                 name = file_name_from_path(path);
1502
1503         if (!unit_name_is_template(name)) {
1504                 *p = NULL;
1505                 return name;
1506         }
1507
1508         if (u->meta.instance)
1509                 s = unit_name_replace_instance(name, u->meta.instance);
1510         else {
1511                 char *i;
1512
1513                 if (!(i = unit_name_to_prefix(u->meta.id)))
1514                         return NULL;
1515
1516                 s = unit_name_replace_instance(name, i);
1517                 free(i);
1518         }
1519
1520         if (!s)
1521                 return NULL;
1522
1523         *p = s;
1524         return s;
1525 }
1526
1527 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1528         Unit *other;
1529         int r;
1530         char *s;
1531
1532         assert(u);
1533         assert(name || path);
1534
1535         if (!(name = resolve_template(u, name, path, &s)))
1536                 return -ENOMEM;
1537
1538         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1539                 goto finish;
1540
1541         r = unit_add_dependency(u, d, other, add_reference);
1542
1543 finish:
1544         free(s);
1545         return r;
1546 }
1547
1548 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1549         Unit *other;
1550         int r;
1551         char *s;
1552
1553         assert(u);
1554         assert(name || path);
1555
1556         if (!(name = resolve_template(u, name, path, &s)))
1557                 return -ENOMEM;
1558
1559         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1560                 goto finish;
1561
1562         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1563
1564 finish:
1565         free(s);
1566         return r;
1567 }
1568
1569 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1570         Unit *other;
1571         int r;
1572         char *s;
1573
1574         assert(u);
1575         assert(name || path);
1576
1577         if (!(name = resolve_template(u, name, path, &s)))
1578                 return -ENOMEM;
1579
1580         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1581                 goto finish;
1582
1583         r = unit_add_dependency(other, d, u, add_reference);
1584
1585 finish:
1586         free(s);
1587         return r;
1588 }
1589
1590 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1591         Unit *other;
1592         int r;
1593         char *s;
1594
1595         assert(u);
1596         assert(name || path);
1597
1598         if (!(name = resolve_template(u, name, path, &s)))
1599                 return -ENOMEM;
1600
1601         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1602                 goto finish;
1603
1604         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1605                 goto finish;
1606
1607 finish:
1608         free(s);
1609         return r;
1610 }
1611
1612 int set_unit_path(const char *p) {
1613         char *cwd, *c;
1614         int r;
1615
1616         /* This is mostly for debug purposes */
1617
1618         if (path_is_absolute(p)) {
1619                 if (!(c = strdup(p)))
1620                         return -ENOMEM;
1621         } else {
1622                 if (!(cwd = get_current_dir_name()))
1623                         return -errno;
1624
1625                 r = asprintf(&c, "%s/%s", cwd, p);
1626                 free(cwd);
1627
1628                 if (r < 0)
1629                         return -ENOMEM;
1630         }
1631
1632         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1633                 r = -errno;
1634                 free(c);
1635                 return r;
1636         }
1637
1638         return 0;
1639 }
1640
1641 char *unit_dbus_path(Unit *u) {
1642         char *p, *e;
1643
1644         assert(u);
1645
1646         if (!u->meta.id)
1647                 return NULL;
1648
1649         if (!(e = bus_path_escape(u->meta.id)))
1650                 return NULL;
1651
1652         p = strappend("/org/freedesktop/systemd1/unit/", e);
1653         free(e);
1654
1655         return p;
1656 }
1657
1658 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1659         CGroupBonding *l;
1660         int r;
1661
1662         assert(u);
1663         assert(b);
1664
1665         assert(b->path);
1666
1667         if (!b->controller)
1668                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1669                         return -ENOMEM;
1670
1671         /* Ensure this hasn't been added yet */
1672         assert(!b->unit);
1673
1674         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1675         LIST_PREPEND(CGroupBonding, by_path, l, b);
1676
1677         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1678                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1679                 return r;
1680         }
1681
1682         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1683         b->unit = u;
1684
1685         return 0;
1686 }
1687
1688 static char *default_cgroup_path(Unit *u) {
1689         char *p;
1690         int r;
1691
1692         assert(u);
1693
1694         if (u->meta.instance) {
1695                 char *t;
1696
1697                 if (!(t = unit_name_template(u->meta.id)))
1698                         return NULL;
1699
1700                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1701                 free(t);
1702         } else
1703                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1704
1705         return r < 0 ? NULL : p;
1706 }
1707
1708 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1709         char *controller = NULL, *path = NULL;
1710         CGroupBonding *b = NULL;
1711         int r;
1712
1713         assert(u);
1714         assert(name);
1715
1716         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1717                 return r;
1718
1719         if (!path)
1720                 path = default_cgroup_path(u);
1721
1722         if (!controller)
1723                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1724
1725         if (!path || !controller) {
1726                 free(path);
1727                 free(controller);
1728
1729                 return -ENOMEM;
1730         }
1731
1732         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1733                 r = -EEXIST;
1734                 goto fail;
1735         }
1736
1737         if (!(b = new0(CGroupBonding, 1))) {
1738                 r = -ENOMEM;
1739                 goto fail;
1740         }
1741
1742         b->controller = controller;
1743         b->path = path;
1744         b->only_us = false;
1745         b->clean_up = false;
1746
1747         if ((r = unit_add_cgroup(u, b)) < 0)
1748                 goto fail;
1749
1750         return 0;
1751
1752 fail:
1753         free(path);
1754         free(controller);
1755         free(b);
1756
1757         return r;
1758 }
1759
1760 int unit_add_default_cgroup(Unit *u) {
1761         CGroupBonding *b;
1762         int r = -ENOMEM;
1763
1764         assert(u);
1765
1766         /* Adds in the default cgroup data, if it wasn't specified yet */
1767
1768         if (unit_get_default_cgroup(u))
1769                 return 0;
1770
1771         if (!(b = new0(CGroupBonding, 1)))
1772                 return -ENOMEM;
1773
1774         if (!(b->path = default_cgroup_path(u)))
1775                 goto fail;
1776
1777         b->clean_up = true;
1778         b->only_us = true;
1779
1780         if ((r = unit_add_cgroup(u, b)) < 0)
1781                 goto fail;
1782
1783         return 0;
1784
1785 fail:
1786         free(b->path);
1787         free(b->controller);
1788         free(b);
1789
1790         return r;
1791 }
1792
1793 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1794         assert(u);
1795
1796         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1797 }
1798
1799 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1800         char *t;
1801         int r;
1802
1803         assert(u);
1804         assert(type);
1805         assert(_found);
1806
1807         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1808                 return -ENOMEM;
1809
1810         assert(!unit_has_name(u, t));
1811
1812         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1813         free(t);
1814
1815         assert(r < 0 || *_found != u);
1816
1817         return r;
1818 }
1819
1820 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1821         Unit *found;
1822         char *t;
1823
1824         assert(u);
1825         assert(type);
1826         assert(_found);
1827
1828         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1829                 return -ENOMEM;
1830
1831         assert(!unit_has_name(u, t));
1832
1833         found = manager_get_unit(u->meta.manager, t);
1834         free(t);
1835
1836         if (!found)
1837                 return -ENOENT;
1838
1839         *_found = found;
1840         return 0;
1841 }
1842
1843 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1844         Unit *u = userdata;
1845         assert(u);
1846
1847         return unit_name_to_prefix_and_instance(u->meta.id);
1848 }
1849
1850 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1851         Unit *u = userdata;
1852         assert(u);
1853
1854         return unit_name_to_prefix(u->meta.id);
1855 }
1856
1857 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1858         Unit *u = userdata;
1859         char *p, *r;
1860
1861         assert(u);
1862
1863         if (!(p = unit_name_to_prefix(u->meta.id)))
1864                 return NULL;
1865
1866         r = unit_name_unescape(p);
1867         free(p);
1868
1869         return r;
1870 }
1871
1872 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1873         Unit *u = userdata;
1874         assert(u);
1875
1876         if (u->meta.instance)
1877                 return unit_name_unescape(u->meta.instance);
1878
1879         return strdup("");
1880 }
1881
1882 static char *specifier_filename(char specifier, void *data, void *userdata) {
1883         Unit *u = userdata;
1884         assert(u);
1885
1886         if (u->meta.instance)
1887                 return unit_name_path_unescape(u->meta.instance);
1888
1889         return unit_name_to_path(u->meta.instance);
1890 }
1891
1892 char *unit_name_printf(Unit *u, const char* format) {
1893
1894         /*
1895          * This will use the passed string as format string and
1896          * replace the following specifiers:
1897          *
1898          * %n: the full id of the unit                 (foo@bar.waldo)
1899          * %N: the id of the unit without the suffix   (foo@bar)
1900          * %p: the prefix                              (foo)
1901          * %i: the instance                            (bar)
1902          */
1903
1904         const Specifier table[] = {
1905                 { 'n', specifier_string,              u->meta.id },
1906                 { 'N', specifier_prefix_and_instance, NULL },
1907                 { 'p', specifier_prefix,              NULL },
1908                 { 'i', specifier_string,              u->meta.instance },
1909                 { 0, NULL, NULL }
1910         };
1911
1912         assert(u);
1913         assert(format);
1914
1915         return specifier_printf(format, table, u);
1916 }
1917
1918 char *unit_full_printf(Unit *u, const char *format) {
1919
1920         /* This is similar to unit_name_printf() but also supports
1921          * unescaping */
1922
1923         const Specifier table[] = {
1924                 { 'n', specifier_string,              u->meta.id },
1925                 { 'N', specifier_prefix_and_instance, NULL },
1926                 { 'p', specifier_prefix,              NULL },
1927                 { 'P', specifier_prefix_unescaped,    NULL },
1928                 { 'i', specifier_string,              u->meta.instance },
1929                 { 'I', specifier_instance_unescaped,  NULL },
1930                 { 'f', specifier_filename,            NULL },
1931                 { 0, NULL, NULL }
1932         };
1933
1934         assert(u);
1935         assert(format);
1936
1937         return specifier_printf(format, table, u);
1938 }
1939
1940 char **unit_full_printf_strv(Unit *u, char **l) {
1941         size_t n;
1942         char **r, **i, **j;
1943
1944         /* Applies unit_full_printf to every entry in l */
1945
1946         assert(u);
1947
1948         n = strv_length(l);
1949         if (!(r = new(char*, n+1)))
1950                 return NULL;
1951
1952         for (i = l, j = r; *i; i++, j++)
1953                 if (!(*j = unit_full_printf(u, *i)))
1954                         goto fail;
1955
1956         *j = NULL;
1957         return r;
1958
1959 fail:
1960         j--;
1961         while (j >= r)
1962                 free(*j);
1963
1964         free(r);
1965
1966         return NULL;
1967 }
1968
1969 int unit_watch_bus_name(Unit *u, const char *name) {
1970         assert(u);
1971         assert(name);
1972
1973         /* Watch a specific name on the bus. We only support one unit
1974          * watching each name for now. */
1975
1976         return hashmap_put(u->meta.manager->watch_bus, name, u);
1977 }
1978
1979 void unit_unwatch_bus_name(Unit *u, const char *name) {
1980         assert(u);
1981         assert(name);
1982
1983         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1984 }
1985
1986 bool unit_can_serialize(Unit *u) {
1987         assert(u);
1988
1989         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1990 }
1991
1992 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1993         int r;
1994
1995         assert(u);
1996         assert(f);
1997         assert(fds);
1998
1999         if (!unit_can_serialize(u))
2000                 return 0;
2001
2002         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2003                 return r;
2004
2005         if (u->meta.job)
2006                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2007
2008         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2009         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2010         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2011         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2012
2013         /* End marker */
2014         fputc('\n', f);
2015         return 0;
2016 }
2017
2018 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2019         va_list ap;
2020
2021         assert(u);
2022         assert(f);
2023         assert(key);
2024         assert(format);
2025
2026         fputs(key, f);
2027         fputc('=', f);
2028
2029         va_start(ap, format);
2030         vfprintf(f, format, ap);
2031         va_end(ap);
2032
2033         fputc('\n', f);
2034 }
2035
2036 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2037         assert(u);
2038         assert(f);
2039         assert(key);
2040         assert(value);
2041
2042         fprintf(f, "%s=%s\n", key, value);
2043 }
2044
2045 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2046         int r;
2047
2048         assert(u);
2049         assert(f);
2050         assert(fds);
2051
2052         if (!unit_can_serialize(u))
2053                 return 0;
2054
2055         for (;;) {
2056                 char line[1024], *l, *v;
2057                 size_t k;
2058
2059                 if (!fgets(line, sizeof(line), f)) {
2060                         if (feof(f))
2061                                 return 0;
2062                         return -errno;
2063                 }
2064
2065                 char_array_0(line);
2066                 l = strstrip(line);
2067
2068                 /* End marker */
2069                 if (l[0] == 0)
2070                         return 0;
2071
2072                 k = strcspn(l, "=");
2073
2074                 if (l[k] == '=') {
2075                         l[k] = 0;
2076                         v = l+k+1;
2077                 } else
2078                         v = l+k;
2079
2080                 if (streq(l, "job")) {
2081                         JobType type;
2082
2083                         if ((type = job_type_from_string(v)) < 0)
2084                                 log_debug("Failed to parse job type value %s", v);
2085                         else
2086                                 u->meta.deserialized_job = type;
2087
2088                         continue;
2089                 } else if (streq(l, "inactive-exit-timestamp")) {
2090                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2091                         continue;
2092                 } else if (streq(l, "active-enter-timestamp")) {
2093                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2094                         continue;
2095                 } else if (streq(l, "active-exit-timestamp")) {
2096                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2097                         continue;
2098                 } else if (streq(l, "inactive-enter-timestamp")) {
2099                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2100                         continue;
2101                 }
2102
2103                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2104                         return r;
2105         }
2106 }
2107
2108 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2109         Unit *device;
2110         char *e;
2111         int r;
2112
2113         assert(u);
2114
2115         if (!what)
2116                 return 0;
2117
2118         /* Adds in links to the device node that this unit is based on */
2119
2120         if (!is_device_path(what))
2121                 return 0;
2122
2123         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2124                 return -ENOMEM;
2125
2126         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2127         free(e);
2128
2129         if (r < 0)
2130                 return r;
2131
2132         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2133                 return r;
2134
2135         if (wants)
2136                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2137                         return r;
2138
2139         return 0;
2140 }
2141
2142 int unit_coldplug(Unit *u) {
2143         int r;
2144
2145         assert(u);
2146
2147         if (UNIT_VTABLE(u)->coldplug)
2148                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2149                         return r;
2150
2151         if (u->meta.deserialized_job >= 0) {
2152                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2153                         return r;
2154
2155                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2156         }
2157
2158         return 0;
2159 }
2160
2161 void unit_status_printf(Unit *u, const char *format, ...) {
2162         va_list ap;
2163
2164         assert(u);
2165         assert(format);
2166
2167         if (!UNIT_VTABLE(u)->show_status)
2168                 return;
2169
2170         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2171                 return;
2172
2173         if (!u->meta.manager->show_status)
2174                 return;
2175
2176         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2177                 return;
2178
2179         va_start(ap, format);
2180         status_vprintf(format, ap);
2181         va_end(ap);
2182 }
2183
2184 bool unit_need_daemon_reload(Unit *u) {
2185         struct stat st;
2186
2187         assert(u);
2188
2189         if (!u->meta.fragment_path)
2190                 return false;
2191
2192         zero(st);
2193         if (stat(u->meta.fragment_path, &st) < 0)
2194                 /* What, cannot access this anymore? */
2195                 return true;
2196
2197         return
2198                 u->meta.fragment_mtime &&
2199                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2200 }
2201
2202 void unit_reset_failed(Unit *u) {
2203         assert(u);
2204
2205         if (UNIT_VTABLE(u)->reset_failed)
2206                 UNIT_VTABLE(u)->reset_failed(u);
2207 }
2208
2209 Unit *unit_following(Unit *u) {
2210         assert(u);
2211
2212         if (UNIT_VTABLE(u)->following)
2213                 return UNIT_VTABLE(u)->following(u);
2214
2215         return NULL;
2216 }
2217
2218 bool unit_pending_inactive(Unit *u) {
2219         assert(u);
2220
2221         /* Returns true if the unit is inactive or going down */
2222
2223         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2224                 return true;
2225
2226         if (u->meta.job && u->meta.job->type == JOB_STOP)
2227                 return true;
2228
2229         return false;
2230 }
2231
2232 bool unit_pending_active(Unit *u) {
2233         assert(u);
2234
2235         /* Returns true if the unit is inactive or going down */
2236
2237         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2238                 return true;
2239
2240         if (u->meta.job &&
2241             (u->meta.job->type == JOB_START ||
2242              u->meta.job->type == JOB_RELOAD_OR_START ||
2243              u->meta.job->type == JOB_RESTART))
2244                 return true;
2245
2246         return false;
2247 }
2248
2249 UnitType unit_name_to_type(const char *n) {
2250         UnitType t;
2251
2252         assert(n);
2253
2254         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2255                 if (endswith(n, unit_vtable[t]->suffix))
2256                         return t;
2257
2258         return _UNIT_TYPE_INVALID;
2259 }
2260
2261 bool unit_name_is_valid(const char *n, bool template_ok) {
2262         UnitType t;
2263
2264         t = unit_name_to_type(n);
2265         if (t < 0 || t >= _UNIT_TYPE_MAX)
2266                 return false;
2267
2268         return unit_name_is_valid_no_type(n, template_ok);
2269 }
2270
2271 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2272         assert(u);
2273         assert(w >= 0 && w < _KILL_WHO_MAX);
2274         assert(m >= 0 && m < _KILL_MODE_MAX);
2275         assert(signo > 0);
2276         assert(signo < _NSIG);
2277
2278         if (m == KILL_NONE)
2279                 return 0;
2280
2281         if (!UNIT_VTABLE(u)->kill)
2282                 return -ENOTSUP;
2283
2284         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2285 }
2286
2287 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2288         [UNIT_STUB] = "stub",
2289         [UNIT_LOADED] = "loaded",
2290         [UNIT_ERROR] = "error",
2291         [UNIT_MERGED] = "merged",
2292         [UNIT_MASKED] = "masked"
2293 };
2294
2295 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2296
2297 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2298         [UNIT_ACTIVE] = "active",
2299         [UNIT_RELOADING] = "reloading",
2300         [UNIT_INACTIVE] = "inactive",
2301         [UNIT_FAILED] = "failed",
2302         [UNIT_ACTIVATING] = "activating",
2303         [UNIT_DEACTIVATING] = "deactivating"
2304 };
2305
2306 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2307
2308 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2309         [UNIT_REQUIRES] = "Requires",
2310         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2311         [UNIT_WANTS] = "Wants",
2312         [UNIT_REQUISITE] = "Requisite",
2313         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2314         [UNIT_REQUIRED_BY] = "RequiredBy",
2315         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2316         [UNIT_WANTED_BY] = "WantedBy",
2317         [UNIT_CONFLICTS] = "Conflicts",
2318         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2319         [UNIT_BEFORE] = "Before",
2320         [UNIT_AFTER] = "After",
2321         [UNIT_REFERENCES] = "References",
2322         [UNIT_REFERENCED_BY] = "ReferencedBy",
2323         [UNIT_ON_FAILURE] = "OnFailure"
2324 };
2325
2326 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);