src/unit.c

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