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\tRecursive Stop: %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.recursive_stop),
 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         if (u->meta.recursive_stop) {
1015                 /* Pull down units need us recursively if enabled */
1016                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1017                         if (!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
1021         /* Garbage collect services that might not be needed anymore, if enabled */
1022         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1023                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1024                         unit_check_unneeded(other);
1025         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1026                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1027                         unit_check_unneeded(other);
1028         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1029                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1030                         unit_check_unneeded(other);
1031         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1032                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1033                         unit_check_unneeded(other);
1034         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1035                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1036                         unit_check_unneeded(other);
1037 }
1038
1039 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1040         dual_timestamp ts;
1041         bool unexpected;
1042
1043         assert(u);
1044         assert(os < _UNIT_ACTIVE_STATE_MAX);
1045         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1046
1047         /* Note that this is called for all low-level state changes,
1048          * even if they might map to the same high-level
1049          * UnitActiveState! That means that ns == os is OK an expected
1050          * behaviour here. For example: if a mount point is remounted
1051          * this function will be called too! */
1052
1053         dual_timestamp_get(&ts);
1054
1055         if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1056                 u->meta.inactive_exit_timestamp = ts;
1057         else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1058                 u->meta.inactive_enter_timestamp = ts;
1059
1060         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1061                 u->meta.active_enter_timestamp = ts;
1062         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1063                 u->meta.active_exit_timestamp = ts;
1064
1065         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1066                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1067
1068         timer_unit_notify(u, ns);
1069         path_unit_notify(u, ns);
1070
1071         if (u->meta.job) {
1072                 unexpected = false;
1073
1074                 if (u->meta.job->state == JOB_WAITING)
1075
1076                         /* So we reached a different state for this
1077                          * job. Let's see if we can run it now if it
1078                          * failed previously due to EAGAIN. */
1079                         job_add_to_run_queue(u->meta.job);
1080
1081                 /* Let's check whether this state change constitutes a
1082                  * finished job, or maybe cotradicts a running job and
1083                  * hence needs to invalidate jobs. */
1084
1085                 switch (u->meta.job->type) {
1086
1087                 case JOB_START:
1088                 case JOB_VERIFY_ACTIVE:
1089
1090                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1091                                 job_finish_and_invalidate(u->meta.job, true);
1092                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1093                                 unexpected = true;
1094
1095                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1096                                         job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1097                         }
1098
1099                         break;
1100
1101                 case JOB_RELOAD:
1102                 case JOB_RELOAD_OR_START:
1103
1104                         if (u->meta.job->state == JOB_RUNNING) {
1105                                 if (ns == UNIT_ACTIVE)
1106                                         job_finish_and_invalidate(u->meta.job, true);
1107                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1108                                         unexpected = true;
1109
1110                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1111                                                 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1112                                 }
1113                         }
1114
1115                         break;
1116
1117                 case JOB_STOP:
1118                 case JOB_RESTART:
1119                 case JOB_TRY_RESTART:
1120
1121                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1122                                 job_finish_and_invalidate(u->meta.job, true);
1123                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1124                                 unexpected = true;
1125                                 job_finish_and_invalidate(u->meta.job, false);
1126                         }
1127
1128                         break;
1129
1130                 default:
1131                         assert_not_reached("Job type unknown");
1132                 }
1133
1134         } else
1135                 unexpected = true;
1136
1137         /* If this state change happened without being requested by a
1138          * job, then let's retroactively start or stop
1139          * dependencies. We skip that step when deserializing, since
1140          * we don't want to create any additional jobs just because
1141          * something is already activated. */
1142
1143         if (unexpected && u->meta.manager->n_deserializing <= 0) {
1144                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1145                         retroactively_start_dependencies(u);
1146                 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1147                         retroactively_stop_dependencies(u);
1148         }
1149
1150         if (ns != os && ns == UNIT_FAILED) {
1151                 Iterator i;
1152                 Unit *other;
1153
1154                 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1155                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1156
1157                 log_notice("Unit %s entered failed state.", u->meta.id);
1158         }
1159
1160         /* Some names are special */
1161         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1162                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1163                         /* The bus just might have become available,
1164                          * hence try to connect to it, if we aren't
1165                          * yet connected. */
1166                         bus_init(u->meta.manager);
1167
1168                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1169                         /* The syslog daemon just might have become
1170                          * available, hence try to connect to it, if
1171                          * we aren't yet connected. */
1172                         log_open();
1173
1174                 if (u->meta.type == UNIT_SERVICE &&
1175                     !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1176                         /* Write audit record if we have just finished starting up */
1177                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1178                         u->meta.in_audit = true;
1179                 }
1180
1181                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1182                         manager_send_unit_plymouth(u->meta.manager, u);
1183
1184         } else {
1185
1186                 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1187                         /* The syslog daemon might just have
1188                          * terminated, hence try to disconnect from
1189                          * it. */
1190                         log_close_syslog();
1191
1192                 /* We don't care about D-Bus here, since we'll get an
1193                  * asynchronous notification for it anyway. */
1194
1195                 if (u->meta.type == UNIT_SERVICE &&
1196                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1197                     !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1198
1199                         /* Hmm, if there was no start record written
1200                          * write it now, so that we always have a nice
1201                          * pair */
1202                         if (!u->meta.in_audit) {
1203                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1204
1205                                 if (ns == UNIT_INACTIVE)
1206                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1207                         } else
1208                                 /* Write audit record if we have just finished shutting down */
1209                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1210
1211                         u->meta.in_audit = false;
1212                 }
1213         }
1214
1215         /* Maybe we finished startup and are now ready for being
1216          * stopped because unneeded? */
1217         unit_check_unneeded(u);
1218
1219         unit_add_to_dbus_queue(u);
1220         unit_add_to_gc_queue(u);
1221 }
1222
1223 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1224         struct epoll_event ev;
1225
1226         assert(u);
1227         assert(fd >= 0);
1228         assert(w);
1229         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1230
1231         zero(ev);
1232         ev.data.ptr = w;
1233         ev.events = events;
1234
1235         if (epoll_ctl(u->meta.manager->epoll_fd,
1236                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1237                       fd,
1238                       &ev) < 0)
1239                 return -errno;
1240
1241         w->fd = fd;
1242         w->type = WATCH_FD;
1243         w->data.unit = u;
1244
1245         return 0;
1246 }
1247
1248 void unit_unwatch_fd(Unit *u, Watch *w) {
1249         assert(u);
1250         assert(w);
1251
1252         if (w->type == WATCH_INVALID)
1253                 return;
1254
1255         assert(w->type == WATCH_FD);
1256         assert(w->data.unit == u);
1257         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1258
1259         w->fd = -1;
1260         w->type = WATCH_INVALID;
1261         w->data.unit = NULL;
1262 }
1263
1264 int unit_watch_pid(Unit *u, pid_t pid) {
1265         assert(u);
1266         assert(pid >= 1);
1267
1268         /* Watch a specific PID. We only support one unit watching
1269          * each PID for now. */
1270
1271         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1272 }
1273
1274 void unit_unwatch_pid(Unit *u, pid_t pid) {
1275         assert(u);
1276         assert(pid >= 1);
1277
1278         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1279 }
1280
1281 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1282         struct itimerspec its;
1283         int flags, fd;
1284         bool ours;
1285
1286         assert(u);
1287         assert(w);
1288         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1289
1290         /* This will try to reuse the old timer if there is one */
1291
1292         if (w->type == WATCH_UNIT_TIMER) {
1293                 assert(w->data.unit == u);
1294                 assert(w->fd >= 0);
1295
1296                 ours = false;
1297                 fd = w->fd;
1298         } else if (w->type == WATCH_INVALID) {
1299
1300                 ours = true;
1301                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1302                         return -errno;
1303         } else
1304                 assert_not_reached("Invalid watch type");
1305
1306         zero(its);
1307
1308         if (delay <= 0) {
1309                 /* Set absolute time in the past, but not 0, since we
1310                  * don't want to disarm the timer */
1311                 its.it_value.tv_sec = 0;
1312                 its.it_value.tv_nsec = 1;
1313
1314                 flags = TFD_TIMER_ABSTIME;
1315         } else {
1316                 timespec_store(&its.it_value, delay);
1317                 flags = 0;
1318         }
1319
1320         /* This will also flush the elapse counter */
1321         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1322                 goto fail;
1323
1324         if (w->type == WATCH_INVALID) {
1325                 struct epoll_event ev;
1326
1327                 zero(ev);
1328                 ev.data.ptr = w;
1329                 ev.events = EPOLLIN;
1330
1331                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1332                         goto fail;
1333         }
1334
1335         w->type = WATCH_UNIT_TIMER;
1336         w->fd = fd;
1337         w->data.unit = u;
1338
1339         return 0;
1340
1341 fail:
1342         if (ours)
1343                 close_nointr_nofail(fd);
1344
1345         return -errno;
1346 }
1347
1348 void unit_unwatch_timer(Unit *u, Watch *w) {
1349         assert(u);
1350         assert(w);
1351
1352         if (w->type == WATCH_INVALID)
1353                 return;
1354
1355         assert(w->type == WATCH_UNIT_TIMER);
1356         assert(w->data.unit == u);
1357         assert(w->fd >= 0);
1358
1359         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1360         close_nointr_nofail(w->fd);
1361
1362         w->fd = -1;
1363         w->type = WATCH_INVALID;
1364         w->data.unit = NULL;
1365 }
1366
1367 bool unit_job_is_applicable(Unit *u, JobType j) {
1368         assert(u);
1369         assert(j >= 0 && j < _JOB_TYPE_MAX);
1370
1371         switch (j) {
1372
1373         case JOB_VERIFY_ACTIVE:
1374         case JOB_START:
1375                 return true;
1376
1377         case JOB_STOP:
1378         case JOB_RESTART:
1379         case JOB_TRY_RESTART:
1380                 return unit_can_start(u);
1381
1382         case JOB_RELOAD:
1383                 return unit_can_reload(u);
1384
1385         case JOB_RELOAD_OR_START:
1386                 return unit_can_reload(u) && unit_can_start(u);
1387
1388         default:
1389                 assert_not_reached("Invalid job type");
1390         }
1391 }
1392
1393 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1394
1395         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1396                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1397                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1398                 [UNIT_WANTS] = UNIT_WANTED_BY,
1399                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1400                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1401                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1402                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1403                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1404                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1405                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1406                 [UNIT_BEFORE] = UNIT_AFTER,
1407                 [UNIT_AFTER] = UNIT_BEFORE,
1408                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1409                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1410                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1411         };
1412         int r, q = 0, v = 0, w = 0;
1413
1414         assert(u);
1415         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1416         assert(other);
1417
1418         u = unit_follow_merge(u);
1419         other = unit_follow_merge(other);
1420
1421         /* We won't allow dependencies on ourselves. We will not
1422          * consider them an error however. */
1423         if (u == other)
1424                 return 0;
1425
1426         if (UNIT_VTABLE(u)->no_requires &&
1427             (d == UNIT_REQUIRES ||
1428              d == UNIT_REQUIRES_OVERRIDABLE ||
1429              d == UNIT_REQUISITE ||
1430              d == UNIT_REQUISITE_OVERRIDABLE)) {
1431                     return -EINVAL;
1432         }
1433
1434         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1435                 return r;
1436
1437         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1438                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1439                         return r;
1440
1441         if (add_reference)
1442                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1443                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1444                         return r;
1445
1446         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1447                 return q;
1448
1449         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1450                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1451                         r = v;
1452                         goto fail;
1453                 }
1454
1455         if (add_reference) {
1456                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1457                         r = w;
1458                         goto fail;
1459                 }
1460
1461                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1462                         goto fail;
1463         }
1464
1465         unit_add_to_dbus_queue(u);
1466         return 0;
1467
1468 fail:
1469         if (q > 0)
1470                 set_remove(u->meta.dependencies[d], other);
1471
1472         if (v > 0)
1473                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1474
1475         if (w > 0)
1476                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1477
1478         return r;
1479 }
1480
1481 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1482         int r;
1483
1484         assert(u);
1485
1486         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1487                 return r;
1488
1489         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1490                 return r;
1491
1492         return 0;
1493 }
1494
1495 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1496         char *s;
1497
1498         assert(u);
1499         assert(name || path);
1500
1501         if (!name)
1502                 name = file_name_from_path(path);
1503
1504         if (!unit_name_is_template(name)) {
1505                 *p = NULL;
1506                 return name;
1507         }
1508
1509         if (u->meta.instance)
1510                 s = unit_name_replace_instance(name, u->meta.instance);
1511         else {
1512                 char *i;
1513
1514                 if (!(i = unit_name_to_prefix(u->meta.id)))
1515                         return NULL;
1516
1517                 s = unit_name_replace_instance(name, i);
1518                 free(i);
1519         }
1520
1521         if (!s)
1522                 return NULL;
1523
1524         *p = s;
1525         return s;
1526 }
1527
1528 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1529         Unit *other;
1530         int r;
1531         char *s;
1532
1533         assert(u);
1534         assert(name || path);
1535
1536         if (!(name = resolve_template(u, name, path, &s)))
1537                 return -ENOMEM;
1538
1539         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1540                 goto finish;
1541
1542         r = unit_add_dependency(u, d, other, add_reference);
1543
1544 finish:
1545         free(s);
1546         return r;
1547 }
1548
1549 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1550         Unit *other;
1551         int r;
1552         char *s;
1553
1554         assert(u);
1555         assert(name || path);
1556
1557         if (!(name = resolve_template(u, name, path, &s)))
1558                 return -ENOMEM;
1559
1560         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1561                 goto finish;
1562
1563         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1564
1565 finish:
1566         free(s);
1567         return r;
1568 }
1569
1570 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1571         Unit *other;
1572         int r;
1573         char *s;
1574
1575         assert(u);
1576         assert(name || path);
1577
1578         if (!(name = resolve_template(u, name, path, &s)))
1579                 return -ENOMEM;
1580
1581         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1582                 goto finish;
1583
1584         r = unit_add_dependency(other, d, u, add_reference);
1585
1586 finish:
1587         free(s);
1588         return r;
1589 }
1590
1591 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1592         Unit *other;
1593         int r;
1594         char *s;
1595
1596         assert(u);
1597         assert(name || path);
1598
1599         if (!(name = resolve_template(u, name, path, &s)))
1600                 return -ENOMEM;
1601
1602         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1603                 goto finish;
1604
1605         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1606                 goto finish;
1607
1608 finish:
1609         free(s);
1610         return r;
1611 }
1612
1613 int set_unit_path(const char *p) {
1614         char *cwd, *c;
1615         int r;
1616
1617         /* This is mostly for debug purposes */
1618
1619         if (path_is_absolute(p)) {
1620                 if (!(c = strdup(p)))
1621                         return -ENOMEM;
1622         } else {
1623                 if (!(cwd = get_current_dir_name()))
1624                         return -errno;
1625
1626                 r = asprintf(&c, "%s/%s", cwd, p);
1627                 free(cwd);
1628
1629                 if (r < 0)
1630                         return -ENOMEM;
1631         }
1632
1633         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1634                 r = -errno;
1635                 free(c);
1636                 return r;
1637         }
1638
1639         return 0;
1640 }
1641
1642 char *unit_dbus_path(Unit *u) {
1643         char *p, *e;
1644
1645         assert(u);
1646
1647         if (!u->meta.id)
1648                 return NULL;
1649
1650         if (!(e = bus_path_escape(u->meta.id)))
1651                 return NULL;
1652
1653         p = strappend("/org/freedesktop/systemd1/unit/", e);
1654         free(e);
1655
1656         return p;
1657 }
1658
1659 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1660         CGroupBonding *l;
1661         int r;
1662
1663         assert(u);
1664         assert(b);
1665
1666         assert(b->path);
1667
1668         if (!b->controller)
1669                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1670                         return -ENOMEM;
1671
1672         /* Ensure this hasn't been added yet */
1673         assert(!b->unit);
1674
1675         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1676         LIST_PREPEND(CGroupBonding, by_path, l, b);
1677
1678         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1679                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1680                 return r;
1681         }
1682
1683         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1684         b->unit = u;
1685
1686         return 0;
1687 }
1688
1689 static char *default_cgroup_path(Unit *u) {
1690         char *p;
1691         int r;
1692
1693         assert(u);
1694
1695         if (u->meta.instance) {
1696                 char *t;
1697
1698                 if (!(t = unit_name_template(u->meta.id)))
1699                         return NULL;
1700
1701                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1702                 free(t);
1703         } else
1704                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1705
1706         return r < 0 ? NULL : p;
1707 }
1708
1709 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1710         char *controller = NULL, *path = NULL;
1711         CGroupBonding *b = NULL;
1712         int r;
1713
1714         assert(u);
1715         assert(name);
1716
1717         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1718                 return r;
1719
1720         if (!path)
1721                 path = default_cgroup_path(u);
1722
1723         if (!controller)
1724                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1725
1726         if (!path || !controller) {
1727                 free(path);
1728                 free(controller);
1729
1730                 return -ENOMEM;
1731         }
1732
1733         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1734                 r = -EEXIST;
1735                 goto fail;
1736         }
1737
1738         if (!(b = new0(CGroupBonding, 1))) {
1739                 r = -ENOMEM;
1740                 goto fail;
1741         }
1742
1743         b->controller = controller;
1744         b->path = path;
1745         b->only_us = false;
1746         b->clean_up = false;
1747
1748         if ((r = unit_add_cgroup(u, b)) < 0)
1749                 goto fail;
1750
1751         return 0;
1752
1753 fail:
1754         free(path);
1755         free(controller);
1756         free(b);
1757
1758         return r;
1759 }
1760
1761 int unit_add_default_cgroup(Unit *u) {
1762         CGroupBonding *b;
1763         int r = -ENOMEM;
1764
1765         assert(u);
1766
1767         /* Adds in the default cgroup data, if it wasn't specified yet */
1768
1769         if (unit_get_default_cgroup(u))
1770                 return 0;
1771
1772         if (!(b = new0(CGroupBonding, 1)))
1773                 return -ENOMEM;
1774
1775         if (!(b->path = default_cgroup_path(u)))
1776                 goto fail;
1777
1778         b->clean_up = true;
1779         b->only_us = true;
1780
1781         if ((r = unit_add_cgroup(u, b)) < 0)
1782                 goto fail;
1783
1784         return 0;
1785
1786 fail:
1787         free(b->path);
1788         free(b->controller);
1789         free(b);
1790
1791         return r;
1792 }
1793
1794 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1795         assert(u);
1796
1797         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1798 }
1799
1800 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1801         char *t;
1802         int r;
1803
1804         assert(u);
1805         assert(type);
1806         assert(_found);
1807
1808         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1809                 return -ENOMEM;
1810
1811         assert(!unit_has_name(u, t));
1812
1813         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1814         free(t);
1815
1816         assert(r < 0 || *_found != u);
1817
1818         return r;
1819 }
1820
1821 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1822         Unit *found;
1823         char *t;
1824
1825         assert(u);
1826         assert(type);
1827         assert(_found);
1828
1829         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1830                 return -ENOMEM;
1831
1832         assert(!unit_has_name(u, t));
1833
1834         found = manager_get_unit(u->meta.manager, t);
1835         free(t);
1836
1837         if (!found)
1838                 return -ENOENT;
1839
1840         *_found = found;
1841         return 0;
1842 }
1843
1844 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1845         Unit *u = userdata;
1846         assert(u);
1847
1848         return unit_name_to_prefix_and_instance(u->meta.id);
1849 }
1850
1851 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1852         Unit *u = userdata;
1853         assert(u);
1854
1855         return unit_name_to_prefix(u->meta.id);
1856 }
1857
1858 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1859         Unit *u = userdata;
1860         char *p, *r;
1861
1862         assert(u);
1863
1864         if (!(p = unit_name_to_prefix(u->meta.id)))
1865                 return NULL;
1866
1867         r = unit_name_unescape(p);
1868         free(p);
1869
1870         return r;
1871 }
1872
1873 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1874         Unit *u = userdata;
1875         assert(u);
1876
1877         if (u->meta.instance)
1878                 return unit_name_unescape(u->meta.instance);
1879
1880         return strdup("");
1881 }
1882
1883 static char *specifier_filename(char specifier, void *data, void *userdata) {
1884         Unit *u = userdata;
1885         assert(u);
1886
1887         if (u->meta.instance)
1888                 return unit_name_path_unescape(u->meta.instance);
1889
1890         return unit_name_to_path(u->meta.instance);
1891 }
1892
1893 char *unit_name_printf(Unit *u, const char* format) {
1894
1895         /*
1896          * This will use the passed string as format string and
1897          * replace the following specifiers:
1898          *
1899          * %n: the full id of the unit                 (foo@bar.waldo)
1900          * %N: the id of the unit without the suffix   (foo@bar)
1901          * %p: the prefix                              (foo)
1902          * %i: the instance                            (bar)
1903          */
1904
1905         const Specifier table[] = {
1906                 { 'n', specifier_string,              u->meta.id },
1907                 { 'N', specifier_prefix_and_instance, NULL },
1908                 { 'p', specifier_prefix,              NULL },
1909                 { 'i', specifier_string,              u->meta.instance },
1910                 { 0, NULL, NULL }
1911         };
1912
1913         assert(u);
1914         assert(format);
1915
1916         return specifier_printf(format, table, u);
1917 }
1918
1919 char *unit_full_printf(Unit *u, const char *format) {
1920
1921         /* This is similar to unit_name_printf() but also supports
1922          * unescaping */
1923
1924         const Specifier table[] = {
1925                 { 'n', specifier_string,              u->meta.id },
1926                 { 'N', specifier_prefix_and_instance, NULL },
1927                 { 'p', specifier_prefix,              NULL },
1928                 { 'P', specifier_prefix_unescaped,    NULL },
1929                 { 'i', specifier_string,              u->meta.instance },
1930                 { 'I', specifier_instance_unescaped,  NULL },
1931                 { 'f', specifier_filename,            NULL },
1932                 { 0, NULL, NULL }
1933         };
1934
1935         assert(u);
1936         assert(format);
1937
1938         return specifier_printf(format, table, u);
1939 }
1940
1941 char **unit_full_printf_strv(Unit *u, char **l) {
1942         size_t n;
1943         char **r, **i, **j;
1944
1945         /* Applies unit_full_printf to every entry in l */
1946
1947         assert(u);
1948
1949         n = strv_length(l);
1950         if (!(r = new(char*, n+1)))
1951                 return NULL;
1952
1953         for (i = l, j = r; *i; i++, j++)
1954                 if (!(*j = unit_full_printf(u, *i)))
1955                         goto fail;
1956
1957         *j = NULL;
1958         return r;
1959
1960 fail:
1961         j--;
1962         while (j >= r)
1963                 free(*j);
1964
1965         free(r);
1966
1967         return NULL;
1968 }
1969
1970 int unit_watch_bus_name(Unit *u, const char *name) {
1971         assert(u);
1972         assert(name);
1973
1974         /* Watch a specific name on the bus. We only support one unit
1975          * watching each name for now. */
1976
1977         return hashmap_put(u->meta.manager->watch_bus, name, u);
1978 }
1979
1980 void unit_unwatch_bus_name(Unit *u, const char *name) {
1981         assert(u);
1982         assert(name);
1983
1984         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1985 }
1986
1987 bool unit_can_serialize(Unit *u) {
1988         assert(u);
1989
1990         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1991 }
1992
1993 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1994         int r;
1995
1996         assert(u);
1997         assert(f);
1998         assert(fds);
1999
2000         if (!unit_can_serialize(u))
2001                 return 0;
2002
2003         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2004                 return r;
2005
2006         if (u->meta.job)
2007                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2008
2009         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2010         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2011         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2012         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2013
2014         /* End marker */
2015         fputc('\n', f);
2016         return 0;
2017 }
2018
2019 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2020         va_list ap;
2021
2022         assert(u);
2023         assert(f);
2024         assert(key);
2025         assert(format);
2026
2027         fputs(key, f);
2028         fputc('=', f);
2029
2030         va_start(ap, format);
2031         vfprintf(f, format, ap);
2032         va_end(ap);
2033
2034         fputc('\n', f);
2035 }
2036
2037 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2038         assert(u);
2039         assert(f);
2040         assert(key);
2041         assert(value);
2042
2043         fprintf(f, "%s=%s\n", key, value);
2044 }
2045
2046 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2047         int r;
2048
2049         assert(u);
2050         assert(f);
2051         assert(fds);
2052
2053         if (!unit_can_serialize(u))
2054                 return 0;
2055
2056         for (;;) {
2057                 char line[1024], *l, *v;
2058                 size_t k;
2059
2060                 if (!fgets(line, sizeof(line), f)) {
2061                         if (feof(f))
2062                                 return 0;
2063                         return -errno;
2064                 }
2065
2066                 char_array_0(line);
2067                 l = strstrip(line);
2068
2069                 /* End marker */
2070                 if (l[0] == 0)
2071                         return 0;
2072
2073                 k = strcspn(l, "=");
2074
2075                 if (l[k] == '=') {
2076                         l[k] = 0;
2077                         v = l+k+1;
2078                 } else
2079                         v = l+k;
2080
2081                 if (streq(l, "job")) {
2082                         JobType type;
2083
2084                         if ((type = job_type_from_string(v)) < 0)
2085                                 log_debug("Failed to parse job type value %s", v);
2086                         else
2087                                 u->meta.deserialized_job = type;
2088
2089                         continue;
2090                 } else if (streq(l, "inactive-exit-timestamp"))
2091                         dual_timestamp_deserialize(f, v, &u->meta.inactive_exit_timestamp);
2092                 else if (streq(l, "active-enter-timestamp"))
2093                         dual_timestamp_deserialize(f, v, &u->meta.active_enter_timestamp);
2094                 else if (streq(l, "active-exit-timestamp"))
2095                         dual_timestamp_deserialize(f, v, &u->meta.active_exit_timestamp);
2096                 else if (streq(l, "inactive-enter-timestamp"))
2097                         dual_timestamp_deserialize(f, v, &u->meta.inactive_enter_timestamp);
2098
2099                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2100                         return r;
2101         }
2102 }
2103
2104 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2105         Unit *device;
2106         char *e;
2107         int r;
2108
2109         assert(u);
2110
2111         if (!what)
2112                 return 0;
2113
2114         /* Adds in links to the device node that this unit is based on */
2115
2116         if (!is_device_path(what))
2117                 return 0;
2118
2119         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2120                 return -ENOMEM;
2121
2122         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2123         free(e);
2124
2125         if (r < 0)
2126                 return r;
2127
2128         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2129                 return r;
2130
2131         if (wants)
2132                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2133                         return r;
2134
2135         return 0;
2136 }
2137
2138 int unit_coldplug(Unit *u) {
2139         int r;
2140
2141         assert(u);
2142
2143         if (UNIT_VTABLE(u)->coldplug)
2144                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2145                         return r;
2146
2147         if (u->meta.deserialized_job >= 0) {
2148                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2149                         return r;
2150
2151                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2152         }
2153
2154         return 0;
2155 }
2156
2157 void unit_status_printf(Unit *u, const char *format, ...) {
2158         va_list ap;
2159
2160         assert(u);
2161         assert(format);
2162
2163         if (!UNIT_VTABLE(u)->show_status)
2164                 return;
2165
2166         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2167                 return;
2168
2169         if (!u->meta.manager->show_status)
2170                 return;
2171
2172         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2173                 return;
2174
2175         va_start(ap, format);
2176         status_vprintf(format, ap);
2177         va_end(ap);
2178 }
2179
2180 bool unit_need_daemon_reload(Unit *u) {
2181         struct stat st;
2182
2183         assert(u);
2184
2185         if (!u->meta.fragment_path)
2186                 return false;
2187
2188         zero(st);
2189         if (stat(u->meta.fragment_path, &st) < 0)
2190                 /* What, cannot access this anymore? */
2191                 return true;
2192
2193         return
2194                 u->meta.fragment_mtime &&
2195                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2196 }
2197
2198 void unit_reset_failed(Unit *u) {
2199         assert(u);
2200
2201         if (UNIT_VTABLE(u)->reset_failed)
2202                 UNIT_VTABLE(u)->reset_failed(u);
2203 }
2204
2205 Unit *unit_following(Unit *u) {
2206         assert(u);
2207
2208         if (UNIT_VTABLE(u)->following)
2209                 return UNIT_VTABLE(u)->following(u);
2210
2211         return NULL;
2212 }
2213
2214 bool unit_pending_inactive(Unit *u) {
2215         assert(u);
2216
2217         /* Returns true if the unit is inactive or going down */
2218
2219         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2220                 return true;
2221
2222         if (u->meta.job && u->meta.job->type == JOB_STOP)
2223                 return true;
2224
2225         return false;
2226 }
2227
2228 bool unit_pending_active(Unit *u) {
2229         assert(u);
2230
2231         /* Returns true if the unit is inactive or going down */
2232
2233         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2234                 return true;
2235
2236         if (u->meta.job &&
2237             (u->meta.job->type == JOB_START ||
2238              u->meta.job->type == JOB_RELOAD_OR_START ||
2239              u->meta.job->type == JOB_RESTART))
2240                 return true;
2241
2242         return false;
2243 }
2244
2245 UnitType unit_name_to_type(const char *n) {
2246         UnitType t;
2247
2248         assert(n);
2249
2250         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2251                 if (endswith(n, unit_vtable[t]->suffix))
2252                         return t;
2253
2254         return _UNIT_TYPE_INVALID;
2255 }
2256
2257 bool unit_name_is_valid(const char *n, bool template_ok) {
2258         UnitType t;
2259
2260         t = unit_name_to_type(n);
2261         if (t < 0 || t >= _UNIT_TYPE_MAX)
2262                 return false;
2263
2264         return unit_name_is_valid_no_type(n, template_ok);
2265 }
2266
2267 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2268         assert(u);
2269         assert(w >= 0 && w < _KILL_WHO_MAX);
2270         assert(m >= 0 && m < _KILL_MODE_MAX);
2271         assert(signo > 0);
2272         assert(signo < _NSIG);
2273
2274         if (m == KILL_NONE)
2275                 return 0;
2276
2277         if (!UNIT_VTABLE(u)->kill)
2278                 return -ENOTSUP;
2279
2280         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2281 }
2282
2283 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2284         [UNIT_STUB] = "stub",
2285         [UNIT_LOADED] = "loaded",
2286         [UNIT_ERROR] = "error",
2287         [UNIT_MERGED] = "merged",
2288         [UNIT_MASKED] = "masked"
2289 };
2290
2291 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2292
2293 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2294         [UNIT_ACTIVE] = "active",
2295         [UNIT_RELOADING] = "reloading",
2296         [UNIT_INACTIVE] = "inactive",
2297         [UNIT_FAILED] = "failed",
2298         [UNIT_ACTIVATING] = "activating",
2299         [UNIT_DEACTIVATING] = "deactivating"
2300 };
2301
2302 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2303
2304 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2305         [UNIT_REQUIRES] = "Requires",
2306         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2307         [UNIT_WANTS] = "Wants",
2308         [UNIT_REQUISITE] = "Requisite",
2309         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2310         [UNIT_REQUIRED_BY] = "RequiredBy",
2311         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2312         [UNIT_WANTED_BY] = "WantedBy",
2313         [UNIT_CONFLICTS] = "Conflicts",
2314         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2315         [UNIT_BEFORE] = "Before",
2316         [UNIT_AFTER] = "After",
2317         [UNIT_REFERENCES] = "References",
2318         [UNIT_REFERENCED_BY] = "ReferencedBy",
2319         [UNIT_ON_FAILURE] = "OnFailure"
2320 };
2321
2322 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);