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