src/unit.c

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