src/unit.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44 #include "missing.h"
  45
  46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  47         [UNIT_SERVICE] = &service_vtable,
  48         [UNIT_TIMER] = &timer_vtable,
  49         [UNIT_SOCKET] = &socket_vtable,
  50         [UNIT_TARGET] = &target_vtable,
  51         [UNIT_DEVICE] = &device_vtable,
  52         [UNIT_MOUNT] = &mount_vtable,
  53         [UNIT_AUTOMOUNT] = &automount_vtable,
  54         [UNIT_SNAPSHOT] = &snapshot_vtable,
  55         [UNIT_SWAP] = &swap_vtable,
  56         [UNIT_PATH] = &path_vtable
  57 };
  58
  59 Unit *unit_new(Manager *m) {
  60         Unit *u;
  61
  62         assert(m);
  63
  64         if (!(u = new0(Unit, 1)))
  65                 return NULL;
  66
  67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  68                 free(u);
  69                 return NULL;
  70         }
  71
  72         u->meta.manager = m;
  73         u->meta.type = _UNIT_TYPE_INVALID;
  74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  75         u->meta.default_dependencies = true;
  76
  77         return u;
  78 }
  79
  80 bool unit_has_name(Unit *u, const char *name) {
  81         assert(u);
  82         assert(name);
  83
  84         return !!set_get(u->meta.names, (char*) name);
  85 }
  86
  87 int unit_add_name(Unit *u, const char *text) {
  88         UnitType t;
  89         char *s, *i = NULL;
  90         int r;
  91
  92         assert(u);
  93         assert(text);
  94
  95         if (unit_name_is_template(text)) {
  96                 if (!u->meta.instance)
  97                         return -EINVAL;
  98
  99                 s = unit_name_replace_instance(text, u->meta.instance);
 100         } else
 101                 s = strdup(text);
 102
 103         if (!s)
 104                 return -ENOMEM;
 105
 106         if (!unit_name_is_valid(s, false)) {
 107                 r = -EINVAL;
 108                 goto fail;
 109         }
 110
 111         assert_se((t = unit_name_to_type(s)) >= 0);
 112
 113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 114                 r = -EINVAL;
 115                 goto fail;
 116         }
 117
 118         if ((r = unit_name_to_instance(s, &i)) < 0)
 119                 goto fail;
 120
 121         if (i && unit_vtable[t]->no_instances)
 122                 goto fail;
 123
 124         /* Ensure that this unit is either instanced or not instanced,
 125          * but not both. */
 126         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 127                 r = -EINVAL;
 128                 goto fail;
 129         }
 130
 131         if (unit_vtable[t]->no_alias &&
 132             !set_isempty(u->meta.names) &&
 133             !set_get(u->meta.names, s)) {
 134                 r = -EEXIST;
 135                 goto fail;
 136         }
 137
 138         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 139                 r = -E2BIG;
 140                 goto fail;
 141         }
 142
 143         if ((r = set_put(u->meta.names, s)) < 0) {
 144                 if (r == -EEXIST)
 145                         r = 0;
 146                 goto fail;
 147         }
 148
 149         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 150                 set_remove(u->meta.names, s);
 151                 goto fail;
 152         }
 153
 154         if (u->meta.type == _UNIT_TYPE_INVALID) {
 155
 156                 u->meta.type = t;
 157                 u->meta.id = s;
 158                 u->meta.instance = i;
 159
 160                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 161
 162                 if (UNIT_VTABLE(u)->init)
 163                         UNIT_VTABLE(u)->init(u);
 164         } else
 165                 free(i);
 166
 167         unit_add_to_dbus_queue(u);
 168         return 0;
 169
 170 fail:
 171         free(s);
 172         free(i);
 173
 174         return r;
 175 }
 176
 177 int unit_choose_id(Unit *u, const char *name) {
 178         char *s, *t = NULL, *i;
 179         int r;
 180
 181         assert(u);
 182         assert(name);
 183
 184         if (unit_name_is_template(name)) {
 185
 186                 if (!u->meta.instance)
 187                         return -EINVAL;
 188
 189                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 190                         return -ENOMEM;
 191
 192                 name = t;
 193         }
 194
 195         /* Selects one of the names of this unit as the id */
 196         s = set_get(u->meta.names, (char*) name);
 197         free(t);
 198
 199         if (!s)
 200                 return -ENOENT;
 201
 202         if ((r = unit_name_to_instance(s, &i)) < 0)
 203                 return r;
 204
 205         u->meta.id = s;
 206
 207         free(u->meta.instance);
 208         u->meta.instance = i;
 209
 210         unit_add_to_dbus_queue(u);
 211
 212         return 0;
 213 }
 214
 215 int unit_set_description(Unit *u, const char *description) {
 216         char *s;
 217
 218         assert(u);
 219
 220         if (!(s = strdup(description)))
 221                 return -ENOMEM;
 222
 223         free(u->meta.description);
 224         u->meta.description = s;
 225
 226         unit_add_to_dbus_queue(u);
 227         return 0;
 228 }
 229
 230 bool unit_check_gc(Unit *u) {
 231         assert(u);
 232
 233         if (u->meta.load_state == UNIT_STUB)
 234                 return true;
 235
 236         if (UNIT_VTABLE(u)->no_gc)
 237                 return true;
 238
 239         if (u->meta.no_gc)
 240                 return true;
 241
 242         if (u->meta.job)
 243                 return true;
 244
 245         if (unit_active_state(u) != UNIT_INACTIVE)
 246                 return true;
 247
 248         if (UNIT_VTABLE(u)->check_gc)
 249                 if (UNIT_VTABLE(u)->check_gc(u))
 250                         return true;
 251
 252         return false;
 253 }
 254
 255 void unit_add_to_load_queue(Unit *u) {
 256         assert(u);
 257         assert(u->meta.type != _UNIT_TYPE_INVALID);
 258
 259         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 260                 return;
 261
 262         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 263         u->meta.in_load_queue = true;
 264 }
 265
 266 void unit_add_to_cleanup_queue(Unit *u) {
 267         assert(u);
 268
 269         if (u->meta.in_cleanup_queue)
 270                 return;
 271
 272         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 273         u->meta.in_cleanup_queue = true;
 274 }
 275
 276 void unit_add_to_gc_queue(Unit *u) {
 277         assert(u);
 278
 279         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 280                 return;
 281
 282         if (unit_check_gc(u))
 283                 return;
 284
 285         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 286         u->meta.in_gc_queue = true;
 287
 288         u->meta.manager->n_in_gc_queue ++;
 289
 290         if (u->meta.manager->gc_queue_timestamp <= 0)
 291                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 292 }
 293
 294 void unit_add_to_dbus_queue(Unit *u) {
 295         assert(u);
 296         assert(u->meta.type != _UNIT_TYPE_INVALID);
 297
 298         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 299                 return;
 300
 301         /* Shortcut things if nobody cares */
 302         if (!bus_has_subscriber(u->meta.manager)) {
 303                 u->meta.sent_dbus_new_signal = true;
 304                 return;
 305         }
 306
 307         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 308         u->meta.in_dbus_queue = true;
 309 }
 310
 311 static void bidi_set_free(Unit *u, Set *s) {
 312         Iterator i;
 313         Unit *other;
 314
 315         assert(u);
 316
 317         /* Frees the set and makes sure we are dropped from the
 318          * inverse pointers */
 319
 320         SET_FOREACH(other, s, i) {
 321                 UnitDependency d;
 322
 323                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 324                         set_remove(other->meta.dependencies[d], u);
 325
 326                 unit_add_to_gc_queue(other);
 327         }
 328
 329         set_free(s);
 330 }
 331
 332 void unit_free(Unit *u) {
 333         UnitDependency d;
 334         Iterator i;
 335         char *t;
 336
 337         assert(u);
 338
 339         bus_unit_send_removed_signal(u);
 340
 341         if (u->meta.load_state != UNIT_STUB)
 342                 if (UNIT_VTABLE(u)->done)
 343                         UNIT_VTABLE(u)->done(u);
 344
 345         SET_FOREACH(t, u->meta.names, i)
 346                 hashmap_remove_value(u->meta.manager->units, t, u);
 347
 348         if (u->meta.job)
 349                 job_free(u->meta.job);
 350
 351         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 352                 bidi_set_free(u, u->meta.dependencies[d]);
 353
 354         if (u->meta.type != _UNIT_TYPE_INVALID)
 355                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 356
 357         if (u->meta.in_load_queue)
 358                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 359
 360         if (u->meta.in_dbus_queue)
 361                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 362
 363         if (u->meta.in_cleanup_queue)
 364                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 365
 366         if (u->meta.in_gc_queue) {
 367                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 368                 u->meta.manager->n_in_gc_queue--;
 369         }
 370
 371         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 372
 373         free(u->meta.description);
 374         free(u->meta.fragment_path);
 375
 376         set_free_free(u->meta.names);
 377
 378         condition_free_list(u->meta.conditions);
 379
 380         free(u->meta.instance);
 381         free(u);
 382 }
 383
 384 UnitActiveState unit_active_state(Unit *u) {
 385         assert(u);
 386
 387         if (u->meta.load_state == UNIT_MERGED)
 388                 return unit_active_state(unit_follow_merge(u));
 389
 390         /* After a reload it might happen that a unit is not correctly
 391          * loaded but still has a process around. That's why we won't
 392          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 393
 394         return UNIT_VTABLE(u)->active_state(u);
 395 }
 396
 397 const char* unit_sub_state_to_string(Unit *u) {
 398         assert(u);
 399
 400         return UNIT_VTABLE(u)->sub_state_to_string(u);
 401 }
 402
 403 static void complete_move(Set **s, Set **other) {
 404         assert(s);
 405         assert(other);
 406
 407         if (!*other)
 408                 return;
 409
 410         if (*s)
 411                 set_move(*s, *other);
 412         else {
 413                 *s = *other;
 414                 *other = NULL;
 415         }
 416 }
 417
 418 static void merge_names(Unit *u, Unit *other) {
 419         char *t;
 420         Iterator i;
 421
 422         assert(u);
 423         assert(other);
 424
 425         complete_move(&u->meta.names, &other->meta.names);
 426
 427         set_free_free(other->meta.names);
 428         other->meta.names = NULL;
 429         other->meta.id = NULL;
 430
 431         SET_FOREACH(t, u->meta.names, i)
 432                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 433 }
 434
 435 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 436         Iterator i;
 437         Unit *back;
 438         int r;
 439
 440         assert(u);
 441         assert(other);
 442         assert(d < _UNIT_DEPENDENCY_MAX);
 443
 444         /* Fix backwards pointers */
 445         SET_FOREACH(back, other->meta.dependencies[d], i) {
 446                 UnitDependency k;
 447
 448                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 449                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 450
 451                                 if (r == -EEXIST)
 452                                         set_remove(back->meta.dependencies[k], other);
 453                                 else
 454                                         assert(r == -ENOENT);
 455                         }
 456         }
 457
 458         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 459
 460         set_free(other->meta.dependencies[d]);
 461         other->meta.dependencies[d] = NULL;
 462 }
 463
 464 int unit_merge(Unit *u, Unit *other) {
 465         UnitDependency d;
 466
 467         assert(u);
 468         assert(other);
 469         assert(u->meta.manager == other->meta.manager);
 470         assert(u->meta.type != _UNIT_TYPE_INVALID);
 471
 472         other = unit_follow_merge(other);
 473
 474         if (other == u)
 475                 return 0;
 476
 477         if (u->meta.type != other->meta.type)
 478                 return -EINVAL;
 479
 480         if (!u->meta.instance != !other->meta.instance)
 481                 return -EINVAL;
 482
 483         if (other->meta.load_state != UNIT_STUB &&
 484             other->meta.load_state != UNIT_ERROR)
 485                 return -EEXIST;
 486
 487         if (other->meta.job)
 488                 return -EEXIST;
 489
 490         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 491                 return -EEXIST;
 492
 493         /* Merge names */
 494         merge_names(u, other);
 495
 496         /* Merge dependencies */
 497         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 498                 merge_dependencies(u, other, d);
 499
 500         other->meta.load_state = UNIT_MERGED;
 501         other->meta.merged_into = u;
 502
 503         /* If there is still some data attached to the other node, we
 504          * don't need it anymore, and can free it. */
 505         if (other->meta.load_state != UNIT_STUB)
 506                 if (UNIT_VTABLE(other)->done)
 507                         UNIT_VTABLE(other)->done(other);
 508
 509         unit_add_to_dbus_queue(u);
 510         unit_add_to_cleanup_queue(other);
 511
 512         return 0;
 513 }
 514
 515 int unit_merge_by_name(Unit *u, const char *name) {
 516         Unit *other;
 517         int r;
 518         char *s = NULL;
 519
 520         assert(u);
 521         assert(name);
 522
 523         if (unit_name_is_template(name)) {
 524                 if (!u->meta.instance)
 525                         return -EINVAL;
 526
 527                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 528                         return -ENOMEM;
 529
 530                 name = s;
 531         }
 532
 533         if (!(other = manager_get_unit(u->meta.manager, name)))
 534                 r = unit_add_name(u, name);
 535         else
 536                 r = unit_merge(u, other);
 537
 538         free(s);
 539         return r;
 540 }
 541
 542 Unit* unit_follow_merge(Unit *u) {
 543         assert(u);
 544
 545         while (u->meta.load_state == UNIT_MERGED)
 546                 assert_se(u = u->meta.merged_into);
 547
 548         return u;
 549 }
 550
 551 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 552         int r;
 553
 554         assert(u);
 555         assert(c);
 556
 557         if (c->std_output != EXEC_OUTPUT_KMSG &&
 558             c->std_output != EXEC_OUTPUT_SYSLOG &&
 559             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 560             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 561             c->std_error != EXEC_OUTPUT_KMSG &&
 562             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 563             c->std_error != EXEC_OUTPUT_KMSG &&
 564             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 565                 return 0;
 566
 567         /* If syslog or kernel logging is requested, make sure our own
 568          * logging daemon is run first. */
 569
 570         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 571                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 572                         return r;
 573
 574         return 0;
 575 }
 576
 577 const char *unit_description(Unit *u) {
 578         assert(u);
 579
 580         if (u->meta.description)
 581                 return u->meta.description;
 582
 583         return strna(u->meta.id);
 584 }
 585
 586 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 587         char *t;
 588         UnitDependency d;
 589         Iterator i;
 590         char *p2;
 591         const char *prefix2;
 592         CGroupBonding *b;
 593         char
 594                 timestamp1[FORMAT_TIMESTAMP_MAX],
 595                 timestamp2[FORMAT_TIMESTAMP_MAX],
 596                 timestamp3[FORMAT_TIMESTAMP_MAX],
 597                 timestamp4[FORMAT_TIMESTAMP_MAX],
 598                 timespan[FORMAT_TIMESPAN_MAX];
 599         Unit *following;
 600
 601         assert(u);
 602         assert(u->meta.type >= 0);
 603
 604         if (!prefix)
 605                 prefix = "";
 606         p2 = strappend(prefix, "\t");
 607         prefix2 = p2 ? p2 : prefix;
 608
 609         fprintf(f,
 610                 "%s-> Unit %s:\n"
 611                 "%s\tDescription: %s\n"
 612                 "%s\tInstance: %s\n"
 613                 "%s\tUnit Load State: %s\n"
 614                 "%s\tUnit Active State: %s\n"
 615                 "%s\tInactive Exit Timestamp: %s\n"
 616                 "%s\tActive Enter Timestamp: %s\n"
 617                 "%s\tActive Exit Timestamp: %s\n"
 618                 "%s\tInactive Enter Timestamp: %s\n"
 619                 "%s\tGC Check Good: %s\n"
 620                 "%s\tNeed Daemon Reload: %s\n",
 621                 prefix, u->meta.id,
 622                 prefix, unit_description(u),
 623                 prefix, strna(u->meta.instance),
 624                 prefix, unit_load_state_to_string(u->meta.load_state),
 625                 prefix, unit_active_state_to_string(unit_active_state(u)),
 626                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 627                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 628                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 629                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 630                 prefix, yes_no(unit_check_gc(u)),
 631                 prefix, yes_no(unit_need_daemon_reload(u)));
 632
 633         SET_FOREACH(t, u->meta.names, i)
 634                 fprintf(f, "%s\tName: %s\n", prefix, t);
 635
 636         if ((following = unit_following(u)))
 637                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 638
 639         if (u->meta.fragment_path)
 640                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 641
 642         if (u->meta.job_timeout > 0)
 643                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 644
 645         condition_dump_list(u->meta.conditions, f, prefix);
 646
 647         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
 648                 fprintf(f,
 649                         "%s\tCondition Timestamp: %s\n"
 650                         "%s\tCondition Result: %s\n",
 651                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
 652                         prefix, yes_no(u->meta.condition_result));
 653
 654         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 655                 Unit *other;
 656
 657                 SET_FOREACH(other, u->meta.dependencies[d], i)
 658                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 659         }
 660
 661         if (u->meta.load_state == UNIT_LOADED) {
 662                 fprintf(f,
 663                         "%s\tStopWhenUnneeded: %s\n"
 664                         "%s\tRefuseManualStart: %s\n"
 665                         "%s\tRefuseManualStop: %s\n"
 666                         "%s\tDefaultDependencies: %s\n"
 667                         "%s\rOnFailureIsolate: %s\n",
 668                         prefix, yes_no(u->meta.stop_when_unneeded),
 669                         prefix, yes_no(u->meta.refuse_manual_start),
 670                         prefix, yes_no(u->meta.refuse_manual_stop),
 671                         prefix, yes_no(u->meta.default_dependencies),
 672                         prefix, yes_no(u->meta.on_failure_isolate));
 673
 674                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 675                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 676                                 prefix, b->controller, b->path);
 677
 678                 if (UNIT_VTABLE(u)->dump)
 679                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 680
 681         } else if (u->meta.load_state == UNIT_MERGED)
 682                 fprintf(f,
 683                         "%s\tMerged into: %s\n",
 684                         prefix, u->meta.merged_into->meta.id);
 685         else if (u->meta.load_state == UNIT_ERROR)
 686                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 687
 688
 689         if (u->meta.job)
 690                 job_dump(u->meta.job, f, prefix2);
 691
 692         free(p2);
 693 }
 694
 695 /* Common implementation for multiple backends */
 696 int unit_load_fragment_and_dropin(Unit *u) {
 697         int r;
 698
 699         assert(u);
 700
 701         /* Load a .service file */
 702         if ((r = unit_load_fragment(u)) < 0)
 703                 return r;
 704
 705         if (u->meta.load_state == UNIT_STUB)
 706                 return -ENOENT;
 707
 708         /* Load drop-in directory data */
 709         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 710                 return r;
 711
 712         return 0;
 713 }
 714
 715 /* Common implementation for multiple backends */
 716 int unit_load_fragment_and_dropin_optional(Unit *u) {
 717         int r;
 718
 719         assert(u);
 720
 721         /* Same as unit_load_fragment_and_dropin(), but whether
 722          * something can be loaded or not doesn't matter. */
 723
 724         /* Load a .service file */
 725         if ((r = unit_load_fragment(u)) < 0)
 726                 return r;
 727
 728         if (u->meta.load_state == UNIT_STUB)
 729                 u->meta.load_state = UNIT_LOADED;
 730
 731         /* Load drop-in directory data */
 732         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 733                 return r;
 734
 735         return 0;
 736 }
 737
 738 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 739         assert(u);
 740         assert(target);
 741
 742         if (target->meta.type != UNIT_TARGET)
 743                 return 0;
 744
 745         /* Only add the dependency if both units are loaded, so that
 746          * that loop check below is reliable */
 747         if (u->meta.load_state != UNIT_LOADED ||
 748             target->meta.load_state != UNIT_LOADED)
 749                 return 0;
 750
 751         /* If either side wants no automatic dependencies, then let's
 752          * skip this */
 753         if (!u->meta.default_dependencies ||
 754             target->meta.default_dependencies)
 755                 return 0;
 756
 757         /* Don't create loops */
 758         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 759                 return 0;
 760
 761         return unit_add_dependency(target, UNIT_AFTER, u, true);
 762 }
 763
 764 static int unit_add_default_dependencies(Unit *u) {
 765         static const UnitDependency deps[] = {
 766                 UNIT_REQUIRED_BY,
 767                 UNIT_REQUIRED_BY_OVERRIDABLE,
 768                 UNIT_WANTED_BY,
 769                 UNIT_BOUND_BY
 770         };
 771
 772         Unit *target;
 773         Iterator i;
 774         int r;
 775         unsigned k;
 776
 777         assert(u);
 778
 779         for (k = 0; k < ELEMENTSOF(deps); k++)
 780                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 781                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 782                                 return r;
 783
 784         return 0;
 785 }
 786
 787 int unit_load(Unit *u) {
 788         int r;
 789
 790         assert(u);
 791
 792         if (u->meta.in_load_queue) {
 793                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 794                 u->meta.in_load_queue = false;
 795         }
 796
 797         if (u->meta.type == _UNIT_TYPE_INVALID)
 798                 return -EINVAL;
 799
 800         if (u->meta.load_state != UNIT_STUB)
 801                 return 0;
 802
 803         if (UNIT_VTABLE(u)->load)
 804                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 805                         goto fail;
 806
 807         if (u->meta.load_state == UNIT_STUB) {
 808                 r = -ENOENT;
 809                 goto fail;
 810         }
 811
 812         if (u->meta.load_state == UNIT_LOADED &&
 813             u->meta.default_dependencies)
 814                 if ((r = unit_add_default_dependencies(u)) < 0)
 815                         goto fail;
 816
 817         if (u->meta.on_failure_isolate &&
 818             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
 819
 820                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 821                           u->meta.id);
 822
 823                 r = -EINVAL;
 824                 goto fail;
 825         }
 826
 827         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 828
 829         unit_add_to_dbus_queue(unit_follow_merge(u));
 830         unit_add_to_gc_queue(u);
 831
 832         return 0;
 833
 834 fail:
 835         u->meta.load_state = UNIT_ERROR;
 836         u->meta.load_error = r;
 837         unit_add_to_dbus_queue(u);
 838
 839         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 840
 841         return r;
 842 }
 843
 844 bool unit_condition_test(Unit *u) {
 845         assert(u);
 846
 847         dual_timestamp_get(&u->meta.condition_timestamp);
 848         u->meta.condition_result = condition_test_list(u->meta.conditions);
 849
 850         return u->meta.condition_result;
 851 }
 852
 853 /* Errors:
 854  *         -EBADR:     This unit type does not support starting.
 855  *         -EALREADY:  Unit is already started.
 856  *         -EAGAIN:    An operation is already in progress. Retry later.
 857  *         -ECANCELED: Too many requests for now.
 858  */
 859 int unit_start(Unit *u) {
 860         UnitActiveState state;
 861         Unit *following;
 862
 863         assert(u);
 864
 865         if (u->meta.load_state != UNIT_LOADED)
 866                 return -EINVAL;
 867
 868         /* If this is already (being) started, then this will
 869          * succeed. Note that this will even succeed if this unit is
 870          * not startable by the user. This is relied on to detect when
 871          * we need to wait for units and when waiting is finished. */
 872         state = unit_active_state(u);
 873         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 874                 return -EALREADY;
 875
 876         /* If the conditions failed, don't do anything at all */
 877         if (!unit_condition_test(u)) {
 878                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 879                 return -EALREADY;
 880         }
 881
 882         /* Forward to the main object, if we aren't it. */
 883         if ((following = unit_following(u))) {
 884                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 885                 return unit_start(following);
 886         }
 887
 888         /* If it is stopped, but we cannot start it, then fail */
 889         if (!UNIT_VTABLE(u)->start)
 890                 return -EBADR;
 891
 892         /* We don't suppress calls to ->start() here when we are
 893          * already starting, to allow this request to be used as a
 894          * "hurry up" call, for example when the unit is in some "auto
 895          * restart" state where it waits for a holdoff timer to elapse
 896          * before it will start again. */
 897
 898         unit_add_to_dbus_queue(u);
 899
 900         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 901         return UNIT_VTABLE(u)->start(u);
 902 }
 903
 904 bool unit_can_start(Unit *u) {
 905         assert(u);
 906
 907         return !!UNIT_VTABLE(u)->start;
 908 }
 909
 910 bool unit_can_isolate(Unit *u) {
 911         assert(u);
 912
 913         return unit_can_start(u) &&
 914                 u->meta.allow_isolate;
 915 }
 916
 917 /* Errors:
 918  *         -EBADR:    This unit type does not support stopping.
 919  *         -EALREADY: Unit is already stopped.
 920  *         -EAGAIN:   An operation is already in progress. Retry later.
 921  */
 922 int unit_stop(Unit *u) {
 923         UnitActiveState state;
 924         Unit *following;
 925
 926         assert(u);
 927
 928         state = unit_active_state(u);
 929         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 930                 return -EALREADY;
 931
 932         if ((following = unit_following(u))) {
 933                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 934                 return unit_stop(following);
 935         }
 936
 937         if (!UNIT_VTABLE(u)->stop)
 938                 return -EBADR;
 939
 940         unit_add_to_dbus_queue(u);
 941
 942         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 943         return UNIT_VTABLE(u)->stop(u);
 944 }
 945
 946 /* Errors:
 947  *         -EBADR:    This unit type does not support reloading.
 948  *         -ENOEXEC:  Unit is not started.
 949  *         -EAGAIN:   An operation is already in progress. Retry later.
 950  */
 951 int unit_reload(Unit *u) {
 952         UnitActiveState state;
 953         Unit *following;
 954
 955         assert(u);
 956
 957         if (u->meta.load_state != UNIT_LOADED)
 958                 return -EINVAL;
 959
 960         if (!unit_can_reload(u))
 961                 return -EBADR;
 962
 963         state = unit_active_state(u);
 964         if (state == UNIT_RELOADING)
 965                 return -EALREADY;
 966
 967         if (state != UNIT_ACTIVE)
 968                 return -ENOEXEC;
 969
 970         if ((following = unit_following(u))) {
 971                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
 972                 return unit_reload(following);
 973         }
 974
 975         unit_add_to_dbus_queue(u);
 976         return UNIT_VTABLE(u)->reload(u);
 977 }
 978
 979 bool unit_can_reload(Unit *u) {
 980         assert(u);
 981
 982         if (!UNIT_VTABLE(u)->reload)
 983                 return false;
 984
 985         if (!UNIT_VTABLE(u)->can_reload)
 986                 return true;
 987
 988         return UNIT_VTABLE(u)->can_reload(u);
 989 }
 990
 991 static void unit_check_unneeded(Unit *u) {
 992         Iterator i;
 993         Unit *other;
 994
 995         assert(u);
 996
 997         /* If this service shall be shut down when unneeded then do
 998          * so. */
 999
1000         if (!u->meta.stop_when_unneeded)
1001                 return;
1002
1003         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1004                 return;
1005
1006         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1007                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1008                         return;
1009
1010         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1011                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1012                         return;
1013
1014         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1015                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1016                         return;
1017
1018         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1019                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1020                         return;
1021
1022         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1023
1024         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1025         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1026 }
1027
1028 static void retroactively_start_dependencies(Unit *u) {
1029         Iterator i;
1030         Unit *other;
1031
1032         assert(u);
1033         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1034
1035         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1036                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1037                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1038                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1039
1040         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1041                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1042                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1043                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1044
1045         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1046                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1047                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1048                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1049
1050         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1051                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1052                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1053                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1054
1055         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1056                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1057                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1058                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1059
1060         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1061                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1062                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1063
1064         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1065                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1066                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1067 }
1068
1069 static void retroactively_stop_dependencies(Unit *u) {
1070         Iterator i;
1071         Unit *other;
1072
1073         assert(u);
1074         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1075
1076         /* Pull down units which are bound to us recursively if enabled */
1077         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1078                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1079                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1080
1081         /* Garbage collect services that might not be needed anymore, if enabled */
1082         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1083                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1084                         unit_check_unneeded(other);
1085         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1086                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1087                         unit_check_unneeded(other);
1088         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1089                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1090                         unit_check_unneeded(other);
1091         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1092                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1093                         unit_check_unneeded(other);
1094         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1095                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1096                         unit_check_unneeded(other);
1097         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1098                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1099                         unit_check_unneeded(other);
1100 }
1101
1102 void unit_trigger_on_failure(Unit *u) {
1103         Unit *other;
1104         Iterator i;
1105
1106         assert(u);
1107
1108         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1109                 return;
1110
1111         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1112
1113         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1114                 int r;
1115
1116                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1117                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1118         }
1119 }
1120
1121 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1122         bool unexpected;
1123
1124         assert(u);
1125         assert(os < _UNIT_ACTIVE_STATE_MAX);
1126         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1127
1128         /* Note that this is called for all low-level state changes,
1129          * even if they might map to the same high-level
1130          * UnitActiveState! That means that ns == os is OK an expected
1131          * behaviour here. For example: if a mount point is remounted
1132          * this function will be called too! */
1133
1134         if (u->meta.manager->n_deserializing <= 0) {
1135                 dual_timestamp ts;
1136
1137                 dual_timestamp_get(&ts);
1138
1139                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1140                         u->meta.inactive_exit_timestamp = ts;
1141                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1142                         u->meta.inactive_enter_timestamp = ts;
1143
1144                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1145                         u->meta.active_enter_timestamp = ts;
1146                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1147                         u->meta.active_exit_timestamp = ts;
1148
1149                 timer_unit_notify(u, ns);
1150                 path_unit_notify(u, ns);
1151         }
1152
1153         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1154                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1155
1156         if (u->meta.job) {
1157                 unexpected = false;
1158
1159                 if (u->meta.job->state == JOB_WAITING)
1160
1161                         /* So we reached a different state for this
1162                          * job. Let's see if we can run it now if it
1163                          * failed previously due to EAGAIN. */
1164                         job_add_to_run_queue(u->meta.job);
1165
1166                 /* Let's check whether this state change constitutes a
1167                  * finished job, or maybe contradicts a running job and
1168                  * hence needs to invalidate jobs. */
1169
1170                 switch (u->meta.job->type) {
1171
1172                 case JOB_START:
1173                 case JOB_VERIFY_ACTIVE:
1174
1175                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1176                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1177                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1178                                 unexpected = true;
1179
1180                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1181                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1182                         }
1183
1184                         break;
1185
1186                 case JOB_RELOAD:
1187                 case JOB_RELOAD_OR_START:
1188
1189                         if (u->meta.job->state == JOB_RUNNING) {
1190                                 if (ns == UNIT_ACTIVE)
1191                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1192                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1193                                         unexpected = true;
1194
1195                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1196                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1197                                 }
1198                         }
1199
1200                         break;
1201
1202                 case JOB_STOP:
1203                 case JOB_RESTART:
1204                 case JOB_TRY_RESTART:
1205
1206                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1207                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1208                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1209                                 unexpected = true;
1210                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1211                         }
1212
1213                         break;
1214
1215                 default:
1216                         assert_not_reached("Job type unknown");
1217                 }
1218
1219         } else
1220                 unexpected = true;
1221
1222         if (u->meta.manager->n_deserializing <= 0) {
1223
1224                 /* If this state change happened without being
1225                  * requested by a job, then let's retroactively start
1226                  * or stop dependencies. We skip that step when
1227                  * deserializing, since we don't want to create any
1228                  * additional jobs just because something is already
1229                  * activated. */
1230
1231                 if (unexpected) {
1232                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1233                                 retroactively_start_dependencies(u);
1234                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1235                                 retroactively_stop_dependencies(u);
1236                 }
1237
1238                 if (ns != os && ns == UNIT_FAILED) {
1239                         log_notice("Unit %s entered failed state.", u->meta.id);
1240                         unit_trigger_on_failure(u);
1241                 }
1242         }
1243
1244         /* Some names are special */
1245         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1246
1247                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1248                         /* The bus just might have become available,
1249                          * hence try to connect to it, if we aren't
1250                          * yet connected. */
1251                         bus_init(u->meta.manager, true);
1252
1253                 if (u->meta.type == UNIT_SERVICE &&
1254                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1255                     u->meta.manager->n_deserializing <= 0) {
1256                         /* Write audit record if we have just finished starting up */
1257                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1258                         u->meta.in_audit = true;
1259                 }
1260
1261                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1262                         manager_send_unit_plymouth(u->meta.manager, u);
1263
1264         } else {
1265
1266                 /* We don't care about D-Bus here, since we'll get an
1267                  * asynchronous notification for it anyway. */
1268
1269                 if (u->meta.type == UNIT_SERVICE &&
1270                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1271                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1272                     u->meta.manager->n_deserializing <= 0) {
1273
1274                         /* Hmm, if there was no start record written
1275                          * write it now, so that we always have a nice
1276                          * pair */
1277                         if (!u->meta.in_audit) {
1278                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1279
1280                                 if (ns == UNIT_INACTIVE)
1281                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1282                         } else
1283                                 /* Write audit record if we have just finished shutting down */
1284                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1285
1286                         u->meta.in_audit = false;
1287                 }
1288         }
1289
1290         manager_recheck_syslog(u->meta.manager);
1291
1292         /* Maybe we finished startup and are now ready for being
1293          * stopped because unneeded? */
1294         unit_check_unneeded(u);
1295
1296         unit_add_to_dbus_queue(u);
1297         unit_add_to_gc_queue(u);
1298 }
1299
1300 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1301         struct epoll_event ev;
1302
1303         assert(u);
1304         assert(fd >= 0);
1305         assert(w);
1306         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1307
1308         zero(ev);
1309         ev.data.ptr = w;
1310         ev.events = events;
1311
1312         if (epoll_ctl(u->meta.manager->epoll_fd,
1313                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1314                       fd,
1315                       &ev) < 0)
1316                 return -errno;
1317
1318         w->fd = fd;
1319         w->type = WATCH_FD;
1320         w->data.unit = u;
1321
1322         return 0;
1323 }
1324
1325 void unit_unwatch_fd(Unit *u, Watch *w) {
1326         assert(u);
1327         assert(w);
1328
1329         if (w->type == WATCH_INVALID)
1330                 return;
1331
1332         assert(w->type == WATCH_FD);
1333         assert(w->data.unit == u);
1334         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1335
1336         w->fd = -1;
1337         w->type = WATCH_INVALID;
1338         w->data.unit = NULL;
1339 }
1340
1341 int unit_watch_pid(Unit *u, pid_t pid) {
1342         assert(u);
1343         assert(pid >= 1);
1344
1345         /* Watch a specific PID. We only support one unit watching
1346          * each PID for now. */
1347
1348         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1349 }
1350
1351 void unit_unwatch_pid(Unit *u, pid_t pid) {
1352         assert(u);
1353         assert(pid >= 1);
1354
1355         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1356 }
1357
1358 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1359         struct itimerspec its;
1360         int flags, fd;
1361         bool ours;
1362
1363         assert(u);
1364         assert(w);
1365         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1366
1367         /* This will try to reuse the old timer if there is one */
1368
1369         if (w->type == WATCH_UNIT_TIMER) {
1370                 assert(w->data.unit == u);
1371                 assert(w->fd >= 0);
1372
1373                 ours = false;
1374                 fd = w->fd;
1375         } else if (w->type == WATCH_INVALID) {
1376
1377                 ours = true;
1378                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1379                         return -errno;
1380         } else
1381                 assert_not_reached("Invalid watch type");
1382
1383         zero(its);
1384
1385         if (delay <= 0) {
1386                 /* Set absolute time in the past, but not 0, since we
1387                  * don't want to disarm the timer */
1388                 its.it_value.tv_sec = 0;
1389                 its.it_value.tv_nsec = 1;
1390
1391                 flags = TFD_TIMER_ABSTIME;
1392         } else {
1393                 timespec_store(&its.it_value, delay);
1394                 flags = 0;
1395         }
1396
1397         /* This will also flush the elapse counter */
1398         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1399                 goto fail;
1400
1401         if (w->type == WATCH_INVALID) {
1402                 struct epoll_event ev;
1403
1404                 zero(ev);
1405                 ev.data.ptr = w;
1406                 ev.events = EPOLLIN;
1407
1408                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1409                         goto fail;
1410         }
1411
1412         w->type = WATCH_UNIT_TIMER;
1413         w->fd = fd;
1414         w->data.unit = u;
1415
1416         return 0;
1417
1418 fail:
1419         if (ours)
1420                 close_nointr_nofail(fd);
1421
1422         return -errno;
1423 }
1424
1425 void unit_unwatch_timer(Unit *u, Watch *w) {
1426         assert(u);
1427         assert(w);
1428
1429         if (w->type == WATCH_INVALID)
1430                 return;
1431
1432         assert(w->type == WATCH_UNIT_TIMER);
1433         assert(w->data.unit == u);
1434         assert(w->fd >= 0);
1435
1436         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1437         close_nointr_nofail(w->fd);
1438
1439         w->fd = -1;
1440         w->type = WATCH_INVALID;
1441         w->data.unit = NULL;
1442 }
1443
1444 bool unit_job_is_applicable(Unit *u, JobType j) {
1445         assert(u);
1446         assert(j >= 0 && j < _JOB_TYPE_MAX);
1447
1448         switch (j) {
1449
1450         case JOB_VERIFY_ACTIVE:
1451         case JOB_START:
1452         case JOB_STOP:
1453                 return true;
1454
1455         case JOB_RESTART:
1456         case JOB_TRY_RESTART:
1457                 return unit_can_start(u);
1458
1459         case JOB_RELOAD:
1460                 return unit_can_reload(u);
1461
1462         case JOB_RELOAD_OR_START:
1463                 return unit_can_reload(u) && unit_can_start(u);
1464
1465         default:
1466                 assert_not_reached("Invalid job type");
1467         }
1468 }
1469
1470 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1471
1472         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1473                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1474                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1475                 [UNIT_WANTS] = UNIT_WANTED_BY,
1476                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1477                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1478                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1479                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1480                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1481                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1482                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1483                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1484                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1485                 [UNIT_BEFORE] = UNIT_AFTER,
1486                 [UNIT_AFTER] = UNIT_BEFORE,
1487                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1488                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1489                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1490         };
1491         int r, q = 0, v = 0, w = 0;
1492
1493         assert(u);
1494         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1495         assert(other);
1496
1497         u = unit_follow_merge(u);
1498         other = unit_follow_merge(other);
1499
1500         /* We won't allow dependencies on ourselves. We will not
1501          * consider them an error however. */
1502         if (u == other)
1503                 return 0;
1504
1505         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1506                 return r;
1507
1508         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1509                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1510                         return r;
1511
1512         if (add_reference)
1513                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1514                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1515                         return r;
1516
1517         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1518                 return q;
1519
1520         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1521                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1522                         r = v;
1523                         goto fail;
1524                 }
1525
1526         if (add_reference) {
1527                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1528                         r = w;
1529                         goto fail;
1530                 }
1531
1532                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1533                         goto fail;
1534         }
1535
1536         unit_add_to_dbus_queue(u);
1537         return 0;
1538
1539 fail:
1540         if (q > 0)
1541                 set_remove(u->meta.dependencies[d], other);
1542
1543         if (v > 0)
1544                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1545
1546         if (w > 0)
1547                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1548
1549         return r;
1550 }
1551
1552 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1553         int r;
1554
1555         assert(u);
1556
1557         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1558                 return r;
1559
1560         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1561                 return r;
1562
1563         return 0;
1564 }
1565
1566 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1567         char *s;
1568
1569         assert(u);
1570         assert(name || path);
1571
1572         if (!name)
1573                 name = file_name_from_path(path);
1574
1575         if (!unit_name_is_template(name)) {
1576                 *p = NULL;
1577                 return name;
1578         }
1579
1580         if (u->meta.instance)
1581                 s = unit_name_replace_instance(name, u->meta.instance);
1582         else {
1583                 char *i;
1584
1585                 if (!(i = unit_name_to_prefix(u->meta.id)))
1586                         return NULL;
1587
1588                 s = unit_name_replace_instance(name, i);
1589                 free(i);
1590         }
1591
1592         if (!s)
1593                 return NULL;
1594
1595         *p = s;
1596         return s;
1597 }
1598
1599 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1600         Unit *other;
1601         int r;
1602         char *s;
1603
1604         assert(u);
1605         assert(name || path);
1606
1607         if (!(name = resolve_template(u, name, path, &s)))
1608                 return -ENOMEM;
1609
1610         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1611                 goto finish;
1612
1613         r = unit_add_dependency(u, d, other, add_reference);
1614
1615 finish:
1616         free(s);
1617         return r;
1618 }
1619
1620 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1621         Unit *other;
1622         int r;
1623         char *s;
1624
1625         assert(u);
1626         assert(name || path);
1627
1628         if (!(name = resolve_template(u, name, path, &s)))
1629                 return -ENOMEM;
1630
1631         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1632                 goto finish;
1633
1634         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1635
1636 finish:
1637         free(s);
1638         return r;
1639 }
1640
1641 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1642         Unit *other;
1643         int r;
1644         char *s;
1645
1646         assert(u);
1647         assert(name || path);
1648
1649         if (!(name = resolve_template(u, name, path, &s)))
1650                 return -ENOMEM;
1651
1652         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1653                 goto finish;
1654
1655         r = unit_add_dependency(other, d, u, add_reference);
1656
1657 finish:
1658         free(s);
1659         return r;
1660 }
1661
1662 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1663         Unit *other;
1664         int r;
1665         char *s;
1666
1667         assert(u);
1668         assert(name || path);
1669
1670         if (!(name = resolve_template(u, name, path, &s)))
1671                 return -ENOMEM;
1672
1673         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1674                 goto finish;
1675
1676         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1677                 goto finish;
1678
1679 finish:
1680         free(s);
1681         return r;
1682 }
1683
1684 int set_unit_path(const char *p) {
1685         char *cwd, *c;
1686         int r;
1687
1688         /* This is mostly for debug purposes */
1689
1690         if (path_is_absolute(p)) {
1691                 if (!(c = strdup(p)))
1692                         return -ENOMEM;
1693         } else {
1694                 if (!(cwd = get_current_dir_name()))
1695                         return -errno;
1696
1697                 r = asprintf(&c, "%s/%s", cwd, p);
1698                 free(cwd);
1699
1700                 if (r < 0)
1701                         return -ENOMEM;
1702         }
1703
1704         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1705                 r = -errno;
1706                 free(c);
1707                 return r;
1708         }
1709
1710         return 0;
1711 }
1712
1713 char *unit_dbus_path(Unit *u) {
1714         char *p, *e;
1715
1716         assert(u);
1717
1718         if (!u->meta.id)
1719                 return NULL;
1720
1721         if (!(e = bus_path_escape(u->meta.id)))
1722                 return NULL;
1723
1724         p = strappend("/org/freedesktop/systemd1/unit/", e);
1725         free(e);
1726
1727         return p;
1728 }
1729
1730 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1731         int r;
1732
1733         assert(u);
1734         assert(b);
1735
1736         assert(b->path);
1737
1738         if (!b->controller)
1739                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1740                         return -ENOMEM;
1741
1742         /* Ensure this hasn't been added yet */
1743         assert(!b->unit);
1744
1745         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1746                 CGroupBonding *l;
1747
1748                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1749                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1750
1751                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1752                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1753                         return r;
1754                 }
1755         }
1756
1757         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1758         b->unit = u;
1759
1760         return 0;
1761 }
1762
1763 static char *default_cgroup_path(Unit *u) {
1764         char *p;
1765         int r;
1766
1767         assert(u);
1768
1769         if (u->meta.instance) {
1770                 char *t;
1771
1772                 if (!(t = unit_name_template(u->meta.id)))
1773                         return NULL;
1774
1775                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1776                 free(t);
1777         } else
1778                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1779
1780         return r < 0 ? NULL : p;
1781 }
1782
1783 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1784         char *controller = NULL, *path = NULL;
1785         CGroupBonding *b = NULL;
1786         int r;
1787
1788         assert(u);
1789         assert(name);
1790
1791         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1792                 return r;
1793
1794         if (!path)
1795                 path = default_cgroup_path(u);
1796
1797         if (!controller)
1798                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1799
1800         if (!path || !controller) {
1801                 free(path);
1802                 free(controller);
1803
1804                 return -ENOMEM;
1805         }
1806
1807         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1808                 r = -EEXIST;
1809                 goto fail;
1810         }
1811
1812         if (!(b = new0(CGroupBonding, 1))) {
1813                 r = -ENOMEM;
1814                 goto fail;
1815         }
1816
1817         b->controller = controller;
1818         b->path = path;
1819         b->ours = false;
1820
1821         if ((r = unit_add_cgroup(u, b)) < 0)
1822                 goto fail;
1823
1824         return 0;
1825
1826 fail:
1827         free(path);
1828         free(controller);
1829         free(b);
1830
1831         return r;
1832 }
1833
1834 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1835         CGroupBonding *b = NULL;
1836         int r = -ENOMEM;
1837
1838         assert(u);
1839
1840         if (!controller)
1841                 controller = SYSTEMD_CGROUP_CONTROLLER;
1842
1843         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1844                 return 0;
1845
1846         if (!(b = new0(CGroupBonding, 1)))
1847                 return -ENOMEM;
1848
1849         if (!(b->controller = strdup(controller)))
1850                 goto fail;
1851
1852         if (!(b->path = default_cgroup_path(u)))
1853                 goto fail;
1854
1855         b->ours = true;
1856         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1857
1858         if ((r = unit_add_cgroup(u, b)) < 0)
1859                 goto fail;
1860
1861         return 0;
1862
1863 fail:
1864         free(b->path);
1865         free(b->controller);
1866         free(b);
1867
1868         return r;
1869 }
1870
1871 int unit_add_default_cgroups(Unit *u) {
1872         char **c;
1873         int r;
1874         assert(u);
1875
1876         /* Adds in the default cgroups, if they weren't specified
1877          * otherwise. */
1878
1879         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1880                 return r;
1881
1882         STRV_FOREACH(c, u->meta.manager->default_controllers)
1883                 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1884                         return r;
1885
1886         return 0;
1887 }
1888
1889 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1890         assert(u);
1891
1892         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1893 }
1894
1895 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1896         char *t;
1897         int r;
1898
1899         assert(u);
1900         assert(type);
1901         assert(_found);
1902
1903         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1904                 return -ENOMEM;
1905
1906         assert(!unit_has_name(u, t));
1907
1908         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1909         free(t);
1910
1911         assert(r < 0 || *_found != u);
1912
1913         return r;
1914 }
1915
1916 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1917         Unit *found;
1918         char *t;
1919
1920         assert(u);
1921         assert(type);
1922         assert(_found);
1923
1924         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1925                 return -ENOMEM;
1926
1927         assert(!unit_has_name(u, t));
1928
1929         found = manager_get_unit(u->meta.manager, t);
1930         free(t);
1931
1932         if (!found)
1933                 return -ENOENT;
1934
1935         *_found = found;
1936         return 0;
1937 }
1938
1939 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1940         Unit *u = userdata;
1941         assert(u);
1942
1943         return unit_name_to_prefix_and_instance(u->meta.id);
1944 }
1945
1946 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1947         Unit *u = userdata;
1948         assert(u);
1949
1950         return unit_name_to_prefix(u->meta.id);
1951 }
1952
1953 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1954         Unit *u = userdata;
1955         char *p, *r;
1956
1957         assert(u);
1958
1959         if (!(p = unit_name_to_prefix(u->meta.id)))
1960                 return NULL;
1961
1962         r = unit_name_unescape(p);
1963         free(p);
1964
1965         return r;
1966 }
1967
1968 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1969         Unit *u = userdata;
1970         assert(u);
1971
1972         if (u->meta.instance)
1973                 return unit_name_unescape(u->meta.instance);
1974
1975         return strdup("");
1976 }
1977
1978 static char *specifier_filename(char specifier, void *data, void *userdata) {
1979         Unit *u = userdata;
1980         assert(u);
1981
1982         if (u->meta.instance)
1983                 return unit_name_path_unescape(u->meta.instance);
1984
1985         return unit_name_to_path(u->meta.instance);
1986 }
1987
1988 char *unit_name_printf(Unit *u, const char* format) {
1989
1990         /*
1991          * This will use the passed string as format string and
1992          * replace the following specifiers:
1993          *
1994          * %n: the full id of the unit                 (foo@bar.waldo)
1995          * %N: the id of the unit without the suffix   (foo@bar)
1996          * %p: the prefix                              (foo)
1997          * %i: the instance                            (bar)
1998          */
1999
2000         const Specifier table[] = {
2001                 { 'n', specifier_string,              u->meta.id },
2002                 { 'N', specifier_prefix_and_instance, NULL },
2003                 { 'p', specifier_prefix,              NULL },
2004                 { 'i', specifier_string,              u->meta.instance },
2005                 { 0, NULL, NULL }
2006         };
2007
2008         assert(u);
2009         assert(format);
2010
2011         return specifier_printf(format, table, u);
2012 }
2013
2014 char *unit_full_printf(Unit *u, const char *format) {
2015
2016         /* This is similar to unit_name_printf() but also supports
2017          * unescaping */
2018
2019         const Specifier table[] = {
2020                 { 'n', specifier_string,              u->meta.id },
2021                 { 'N', specifier_prefix_and_instance, NULL },
2022                 { 'p', specifier_prefix,              NULL },
2023                 { 'P', specifier_prefix_unescaped,    NULL },
2024                 { 'i', specifier_string,              u->meta.instance },
2025                 { 'I', specifier_instance_unescaped,  NULL },
2026                 { 'f', specifier_filename,            NULL },
2027                 { 0, NULL, NULL }
2028         };
2029
2030         assert(u);
2031         assert(format);
2032
2033         return specifier_printf(format, table, u);
2034 }
2035
2036 char **unit_full_printf_strv(Unit *u, char **l) {
2037         size_t n;
2038         char **r, **i, **j;
2039
2040         /* Applies unit_full_printf to every entry in l */
2041
2042         assert(u);
2043
2044         n = strv_length(l);
2045         if (!(r = new(char*, n+1)))
2046                 return NULL;
2047
2048         for (i = l, j = r; *i; i++, j++)
2049                 if (!(*j = unit_full_printf(u, *i)))
2050                         goto fail;
2051
2052         *j = NULL;
2053         return r;
2054
2055 fail:
2056         for (j--; j >= r; j--)
2057                 free(*j);
2058
2059         free(r);
2060
2061         return NULL;
2062 }
2063
2064 int unit_watch_bus_name(Unit *u, const char *name) {
2065         assert(u);
2066         assert(name);
2067
2068         /* Watch a specific name on the bus. We only support one unit
2069          * watching each name for now. */
2070
2071         return hashmap_put(u->meta.manager->watch_bus, name, u);
2072 }
2073
2074 void unit_unwatch_bus_name(Unit *u, const char *name) {
2075         assert(u);
2076         assert(name);
2077
2078         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2079 }
2080
2081 bool unit_can_serialize(Unit *u) {
2082         assert(u);
2083
2084         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2085 }
2086
2087 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2088         int r;
2089
2090         assert(u);
2091         assert(f);
2092         assert(fds);
2093
2094         if (!unit_can_serialize(u))
2095                 return 0;
2096
2097         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2098                 return r;
2099
2100         if (u->meta.job)
2101                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2102
2103         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2104         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2105         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2106         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2107         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2108
2109         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2110                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2111
2112         /* End marker */
2113         fputc('\n', f);
2114         return 0;
2115 }
2116
2117 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2118         va_list ap;
2119
2120         assert(u);
2121         assert(f);
2122         assert(key);
2123         assert(format);
2124
2125         fputs(key, f);
2126         fputc('=', f);
2127
2128         va_start(ap, format);
2129         vfprintf(f, format, ap);
2130         va_end(ap);
2131
2132         fputc('\n', f);
2133 }
2134
2135 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2136         assert(u);
2137         assert(f);
2138         assert(key);
2139         assert(value);
2140
2141         fprintf(f, "%s=%s\n", key, value);
2142 }
2143
2144 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2145         int r;
2146
2147         assert(u);
2148         assert(f);
2149         assert(fds);
2150
2151         if (!unit_can_serialize(u))
2152                 return 0;
2153
2154         for (;;) {
2155                 char line[LINE_MAX], *l, *v;
2156                 size_t k;
2157
2158                 if (!fgets(line, sizeof(line), f)) {
2159                         if (feof(f))
2160                                 return 0;
2161                         return -errno;
2162                 }
2163
2164                 char_array_0(line);
2165                 l = strstrip(line);
2166
2167                 /* End marker */
2168                 if (l[0] == 0)
2169                         return 0;
2170
2171                 k = strcspn(l, "=");
2172
2173                 if (l[k] == '=') {
2174                         l[k] = 0;
2175                         v = l+k+1;
2176                 } else
2177                         v = l+k;
2178
2179                 if (streq(l, "job")) {
2180                         JobType type;
2181
2182                         if ((type = job_type_from_string(v)) < 0)
2183                                 log_debug("Failed to parse job type value %s", v);
2184                         else
2185                                 u->meta.deserialized_job = type;
2186
2187                         continue;
2188                 } else if (streq(l, "inactive-exit-timestamp")) {
2189                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2190                         continue;
2191                 } else if (streq(l, "active-enter-timestamp")) {
2192                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2193                         continue;
2194                 } else if (streq(l, "active-exit-timestamp")) {
2195                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2196                         continue;
2197                 } else if (streq(l, "inactive-enter-timestamp")) {
2198                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2199                         continue;
2200                 } else if (streq(l, "condition-timestamp")) {
2201                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2202                         continue;
2203                 } else if (streq(l, "condition-result")) {
2204                         int b;
2205
2206                         if ((b = parse_boolean(v)) < 0)
2207                                 log_debug("Failed to parse condition result value %s", v);
2208                         else
2209                                 u->meta.condition_result = b;
2210
2211                         continue;
2212                 }
2213
2214                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2215                         return r;
2216         }
2217 }
2218
2219 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2220         Unit *device;
2221         char *e;
2222         int r;
2223
2224         assert(u);
2225
2226         if (!what)
2227                 return 0;
2228
2229         /* Adds in links to the device node that this unit is based on */
2230
2231         if (!is_device_path(what))
2232                 return 0;
2233
2234         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2235                 return -ENOMEM;
2236
2237         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2238         free(e);
2239
2240         if (r < 0)
2241                 return r;
2242
2243         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2244                 return r;
2245
2246         if (wants)
2247                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2248                         return r;
2249
2250         return 0;
2251 }
2252
2253 int unit_coldplug(Unit *u) {
2254         int r;
2255
2256         assert(u);
2257
2258         if (UNIT_VTABLE(u)->coldplug)
2259                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2260                         return r;
2261
2262         if (u->meta.deserialized_job >= 0) {
2263                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2264                         return r;
2265
2266                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2267         }
2268
2269         return 0;
2270 }
2271
2272 void unit_status_printf(Unit *u, const char *format, ...) {
2273         va_list ap;
2274
2275         assert(u);
2276         assert(format);
2277
2278         if (!UNIT_VTABLE(u)->show_status)
2279                 return;
2280
2281         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2282                 return;
2283
2284         /* If Plymouth is running make sure we show the status, so
2285          * that there's something nice to see when people press Esc */
2286
2287         if (!u->meta.manager->show_status && !plymouth_running())
2288                 return;
2289
2290         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2291                 return;
2292
2293         va_start(ap, format);
2294         status_vprintf(format, ap);
2295         va_end(ap);
2296 }
2297
2298 bool unit_need_daemon_reload(Unit *u) {
2299         struct stat st;
2300
2301         assert(u);
2302
2303         if (!u->meta.fragment_path)
2304                 return false;
2305
2306         zero(st);
2307         if (stat(u->meta.fragment_path, &st) < 0)
2308                 /* What, cannot access this anymore? */
2309                 return true;
2310
2311         return
2312                 u->meta.fragment_mtime &&
2313                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2314 }
2315
2316 void unit_reset_failed(Unit *u) {
2317         assert(u);
2318
2319         if (UNIT_VTABLE(u)->reset_failed)
2320                 UNIT_VTABLE(u)->reset_failed(u);
2321 }
2322
2323 Unit *unit_following(Unit *u) {
2324         assert(u);
2325
2326         if (UNIT_VTABLE(u)->following)
2327                 return UNIT_VTABLE(u)->following(u);
2328
2329         return NULL;
2330 }
2331
2332 bool unit_pending_inactive(Unit *u) {
2333         assert(u);
2334
2335         /* Returns true if the unit is inactive or going down */
2336
2337         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2338                 return true;
2339
2340         if (u->meta.job && u->meta.job->type == JOB_STOP)
2341                 return true;
2342
2343         return false;
2344 }
2345
2346 bool unit_pending_active(Unit *u) {
2347         assert(u);
2348
2349         /* Returns true if the unit is inactive or going down */
2350
2351         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2352                 return true;
2353
2354         if (u->meta.job &&
2355             (u->meta.job->type == JOB_START ||
2356              u->meta.job->type == JOB_RELOAD_OR_START ||
2357              u->meta.job->type == JOB_RESTART))
2358                 return true;
2359
2360         return false;
2361 }
2362
2363 UnitType unit_name_to_type(const char *n) {
2364         UnitType t;
2365
2366         assert(n);
2367
2368         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2369                 if (endswith(n, unit_vtable[t]->suffix))
2370                         return t;
2371
2372         return _UNIT_TYPE_INVALID;
2373 }
2374
2375 bool unit_name_is_valid(const char *n, bool template_ok) {
2376         UnitType t;
2377
2378         t = unit_name_to_type(n);
2379         if (t < 0 || t >= _UNIT_TYPE_MAX)
2380                 return false;
2381
2382         return unit_name_is_valid_no_type(n, template_ok);
2383 }
2384
2385 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2386         assert(u);
2387         assert(w >= 0 && w < _KILL_WHO_MAX);
2388         assert(m >= 0 && m < _KILL_MODE_MAX);
2389         assert(signo > 0);
2390         assert(signo < _NSIG);
2391
2392         if (m == KILL_NONE)
2393                 return 0;
2394
2395         if (!UNIT_VTABLE(u)->kill)
2396                 return -ENOTSUP;
2397
2398         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2399 }
2400
2401
2402 int unit_following_set(Unit *u, Set **s) {
2403         assert(u);
2404         assert(s);
2405
2406         if (UNIT_VTABLE(u)->following_set)
2407                 return UNIT_VTABLE(u)->following_set(u, s);
2408
2409         *s = NULL;
2410         return 0;
2411 }
2412
2413 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2414         [UNIT_STUB] = "stub",
2415         [UNIT_LOADED] = "loaded",
2416         [UNIT_ERROR] = "error",
2417         [UNIT_MERGED] = "merged",
2418         [UNIT_MASKED] = "masked"
2419 };
2420
2421 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2422
2423 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2424         [UNIT_ACTIVE] = "active",
2425         [UNIT_RELOADING] = "reloading",
2426         [UNIT_INACTIVE] = "inactive",
2427         [UNIT_FAILED] = "failed",
2428         [UNIT_ACTIVATING] = "activating",
2429         [UNIT_DEACTIVATING] = "deactivating"
2430 };
2431
2432 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2433
2434 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2435         [UNIT_REQUIRES] = "Requires",
2436         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2437         [UNIT_WANTS] = "Wants",
2438         [UNIT_REQUISITE] = "Requisite",
2439         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2440         [UNIT_REQUIRED_BY] = "RequiredBy",
2441         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2442         [UNIT_BIND_TO] = "BindTo",
2443         [UNIT_WANTED_BY] = "WantedBy",
2444         [UNIT_CONFLICTS] = "Conflicts",
2445         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2446         [UNIT_BOUND_BY] = "BoundBy",
2447         [UNIT_BEFORE] = "Before",
2448         [UNIT_AFTER] = "After",
2449         [UNIT_REFERENCES] = "References",
2450         [UNIT_REFERENCED_BY] = "ReferencedBy",
2451         [UNIT_ON_FAILURE] = "OnFailure"
2452 };
2453
2454 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);