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 #include "cgroup-attr.h"
  46
  47 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  48         [UNIT_SERVICE] = &service_vtable,
  49         [UNIT_TIMER] = &timer_vtable,
  50         [UNIT_SOCKET] = &socket_vtable,
  51         [UNIT_TARGET] = &target_vtable,
  52         [UNIT_DEVICE] = &device_vtable,
  53         [UNIT_MOUNT] = &mount_vtable,
  54         [UNIT_AUTOMOUNT] = &automount_vtable,
  55         [UNIT_SNAPSHOT] = &snapshot_vtable,
  56         [UNIT_SWAP] = &swap_vtable,
  57         [UNIT_PATH] = &path_vtable
  58 };
  59
  60 Unit *unit_new(Manager *m) {
  61         Unit *u;
  62
  63         assert(m);
  64
  65         if (!(u = new0(Unit, 1)))
  66                 return NULL;
  67
  68         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  69                 free(u);
  70                 return NULL;
  71         }
  72
  73         u->meta.manager = m;
  74         u->meta.type = _UNIT_TYPE_INVALID;
  75         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  76         u->meta.default_dependencies = true;
  77         u->meta.unit_file_state = _UNIT_FILE_STATE_INVALID;
  78
  79         return u;
  80 }
  81
  82 bool unit_has_name(Unit *u, const char *name) {
  83         assert(u);
  84         assert(name);
  85
  86         return !!set_get(u->meta.names, (char*) name);
  87 }
  88
  89 int unit_add_name(Unit *u, const char *text) {
  90         UnitType t;
  91         char *s, *i = NULL;
  92         int r;
  93
  94         assert(u);
  95         assert(text);
  96
  97         if (unit_name_is_template(text)) {
  98                 if (!u->meta.instance)
  99                         return -EINVAL;
 100
 101                 s = unit_name_replace_instance(text, u->meta.instance);
 102         } else
 103                 s = strdup(text);
 104
 105         if (!s)
 106                 return -ENOMEM;
 107
 108         if (!unit_name_is_valid(s, false)) {
 109                 r = -EINVAL;
 110                 goto fail;
 111         }
 112
 113         assert_se((t = unit_name_to_type(s)) >= 0);
 114
 115         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 116                 r = -EINVAL;
 117                 goto fail;
 118         }
 119
 120         if ((r = unit_name_to_instance(s, &i)) < 0)
 121                 goto fail;
 122
 123         if (i && unit_vtable[t]->no_instances) {
 124                 r = -EINVAL;
 125                 goto fail;
 126         }
 127
 128         /* Ensure that this unit is either instanced or not instanced,
 129          * but not both. */
 130         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 131                 r = -EINVAL;
 132                 goto fail;
 133         }
 134
 135         if (unit_vtable[t]->no_alias &&
 136             !set_isempty(u->meta.names) &&
 137             !set_get(u->meta.names, s)) {
 138                 r = -EEXIST;
 139                 goto fail;
 140         }
 141
 142         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 143                 r = -E2BIG;
 144                 goto fail;
 145         }
 146
 147         if ((r = set_put(u->meta.names, s)) < 0) {
 148                 if (r == -EEXIST)
 149                         r = 0;
 150                 goto fail;
 151         }
 152
 153         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 154                 set_remove(u->meta.names, s);
 155                 goto fail;
 156         }
 157
 158         if (u->meta.type == _UNIT_TYPE_INVALID) {
 159
 160                 u->meta.type = t;
 161                 u->meta.id = s;
 162                 u->meta.instance = i;
 163
 164                 LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
 165
 166                 if (UNIT_VTABLE(u)->init)
 167                         UNIT_VTABLE(u)->init(u);
 168         } else
 169                 free(i);
 170
 171         unit_add_to_dbus_queue(u);
 172         return 0;
 173
 174 fail:
 175         free(s);
 176         free(i);
 177
 178         return r;
 179 }
 180
 181 int unit_choose_id(Unit *u, const char *name) {
 182         char *s, *t = NULL, *i;
 183         int r;
 184
 185         assert(u);
 186         assert(name);
 187
 188         if (unit_name_is_template(name)) {
 189
 190                 if (!u->meta.instance)
 191                         return -EINVAL;
 192
 193                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 194                         return -ENOMEM;
 195
 196                 name = t;
 197         }
 198
 199         /* Selects one of the names of this unit as the id */
 200         s = set_get(u->meta.names, (char*) name);
 201         free(t);
 202
 203         if (!s)
 204                 return -ENOENT;
 205
 206         if ((r = unit_name_to_instance(s, &i)) < 0)
 207                 return r;
 208
 209         u->meta.id = s;
 210
 211         free(u->meta.instance);
 212         u->meta.instance = i;
 213
 214         unit_add_to_dbus_queue(u);
 215
 216         return 0;
 217 }
 218
 219 int unit_set_description(Unit *u, const char *description) {
 220         char *s;
 221
 222         assert(u);
 223
 224         if (!(s = strdup(description)))
 225                 return -ENOMEM;
 226
 227         free(u->meta.description);
 228         u->meta.description = s;
 229
 230         unit_add_to_dbus_queue(u);
 231         return 0;
 232 }
 233
 234 bool unit_check_gc(Unit *u) {
 235         assert(u);
 236
 237         if (u->meta.load_state == UNIT_STUB)
 238                 return true;
 239
 240         if (UNIT_VTABLE(u)->no_gc)
 241                 return true;
 242
 243         if (u->meta.no_gc)
 244                 return true;
 245
 246         if (u->meta.job)
 247                 return true;
 248
 249         if (unit_active_state(u) != UNIT_INACTIVE)
 250                 return true;
 251
 252         if (UNIT_VTABLE(u)->check_gc)
 253                 if (UNIT_VTABLE(u)->check_gc(u))
 254                         return true;
 255
 256         return false;
 257 }
 258
 259 void unit_add_to_load_queue(Unit *u) {
 260         assert(u);
 261         assert(u->meta.type != _UNIT_TYPE_INVALID);
 262
 263         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 264                 return;
 265
 266         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 267         u->meta.in_load_queue = true;
 268 }
 269
 270 void unit_add_to_cleanup_queue(Unit *u) {
 271         assert(u);
 272
 273         if (u->meta.in_cleanup_queue)
 274                 return;
 275
 276         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 277         u->meta.in_cleanup_queue = true;
 278 }
 279
 280 void unit_add_to_gc_queue(Unit *u) {
 281         assert(u);
 282
 283         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 284                 return;
 285
 286         if (unit_check_gc(u))
 287                 return;
 288
 289         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 290         u->meta.in_gc_queue = true;
 291
 292         u->meta.manager->n_in_gc_queue ++;
 293
 294         if (u->meta.manager->gc_queue_timestamp <= 0)
 295                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 296 }
 297
 298 void unit_add_to_dbus_queue(Unit *u) {
 299         assert(u);
 300         assert(u->meta.type != _UNIT_TYPE_INVALID);
 301
 302         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 303                 return;
 304
 305         /* Shortcut things if nobody cares */
 306         if (!bus_has_subscriber(u->meta.manager)) {
 307                 u->meta.sent_dbus_new_signal = true;
 308                 return;
 309         }
 310
 311         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 312         u->meta.in_dbus_queue = true;
 313 }
 314
 315 static void bidi_set_free(Unit *u, Set *s) {
 316         Iterator i;
 317         Unit *other;
 318
 319         assert(u);
 320
 321         /* Frees the set and makes sure we are dropped from the
 322          * inverse pointers */
 323
 324         SET_FOREACH(other, s, i) {
 325                 UnitDependency d;
 326
 327                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 328                         set_remove(other->meta.dependencies[d], u);
 329
 330                 unit_add_to_gc_queue(other);
 331         }
 332
 333         set_free(s);
 334 }
 335
 336 void unit_free(Unit *u) {
 337         UnitDependency d;
 338         Iterator i;
 339         char *t;
 340
 341         assert(u);
 342
 343         bus_unit_send_removed_signal(u);
 344
 345         if (u->meta.load_state != UNIT_STUB)
 346                 if (UNIT_VTABLE(u)->done)
 347                         UNIT_VTABLE(u)->done(u);
 348
 349         SET_FOREACH(t, u->meta.names, i)
 350                 hashmap_remove_value(u->meta.manager->units, t, u);
 351
 352         if (u->meta.job)
 353                 job_free(u->meta.job);
 354
 355         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 356                 bidi_set_free(u, u->meta.dependencies[d]);
 357
 358         if (u->meta.type != _UNIT_TYPE_INVALID)
 359                 LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
 360
 361         if (u->meta.in_load_queue)
 362                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 363
 364         if (u->meta.in_dbus_queue)
 365                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 366
 367         if (u->meta.in_cleanup_queue)
 368                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 369
 370         if (u->meta.in_gc_queue) {
 371                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 372                 u->meta.manager->n_in_gc_queue--;
 373         }
 374
 375         cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_reloading <= 0);
 376         cgroup_attribute_free_list(u->meta.cgroup_attributes);
 377
 378         free(u->meta.description);
 379         free(u->meta.fragment_path);
 380
 381         set_free_free(u->meta.names);
 382
 383         condition_free_list(u->meta.conditions);
 384
 385         free(u->meta.instance);
 386         free(u);
 387 }
 388
 389 UnitActiveState unit_active_state(Unit *u) {
 390         assert(u);
 391
 392         if (u->meta.load_state == UNIT_MERGED)
 393                 return unit_active_state(unit_follow_merge(u));
 394
 395         /* After a reload it might happen that a unit is not correctly
 396          * loaded but still has a process around. That's why we won't
 397          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 398
 399         return UNIT_VTABLE(u)->active_state(u);
 400 }
 401
 402 const char* unit_sub_state_to_string(Unit *u) {
 403         assert(u);
 404
 405         return UNIT_VTABLE(u)->sub_state_to_string(u);
 406 }
 407
 408 static void complete_move(Set **s, Set **other) {
 409         assert(s);
 410         assert(other);
 411
 412         if (!*other)
 413                 return;
 414
 415         if (*s)
 416                 set_move(*s, *other);
 417         else {
 418                 *s = *other;
 419                 *other = NULL;
 420         }
 421 }
 422
 423 static void merge_names(Unit *u, Unit *other) {
 424         char *t;
 425         Iterator i;
 426
 427         assert(u);
 428         assert(other);
 429
 430         complete_move(&u->meta.names, &other->meta.names);
 431
 432         set_free_free(other->meta.names);
 433         other->meta.names = NULL;
 434         other->meta.id = NULL;
 435
 436         SET_FOREACH(t, u->meta.names, i)
 437                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 438 }
 439
 440 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 441         Iterator i;
 442         Unit *back;
 443         int r;
 444
 445         assert(u);
 446         assert(other);
 447         assert(d < _UNIT_DEPENDENCY_MAX);
 448
 449         /* Fix backwards pointers */
 450         SET_FOREACH(back, other->meta.dependencies[d], i) {
 451                 UnitDependency k;
 452
 453                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 454                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 455
 456                                 if (r == -EEXIST)
 457                                         set_remove(back->meta.dependencies[k], other);
 458                                 else
 459                                         assert(r == -ENOENT);
 460                         }
 461         }
 462
 463         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 464
 465         set_free(other->meta.dependencies[d]);
 466         other->meta.dependencies[d] = NULL;
 467 }
 468
 469 int unit_merge(Unit *u, Unit *other) {
 470         UnitDependency d;
 471
 472         assert(u);
 473         assert(other);
 474         assert(u->meta.manager == other->meta.manager);
 475         assert(u->meta.type != _UNIT_TYPE_INVALID);
 476
 477         other = unit_follow_merge(other);
 478
 479         if (other == u)
 480                 return 0;
 481
 482         if (u->meta.type != other->meta.type)
 483                 return -EINVAL;
 484
 485         if (!u->meta.instance != !other->meta.instance)
 486                 return -EINVAL;
 487
 488         if (other->meta.load_state != UNIT_STUB &&
 489             other->meta.load_state != UNIT_ERROR)
 490                 return -EEXIST;
 491
 492         if (other->meta.job)
 493                 return -EEXIST;
 494
 495         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 496                 return -EEXIST;
 497
 498         /* Merge names */
 499         merge_names(u, other);
 500
 501         /* Merge dependencies */
 502         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 503                 merge_dependencies(u, other, d);
 504
 505         other->meta.load_state = UNIT_MERGED;
 506         other->meta.merged_into = u;
 507
 508         /* If there is still some data attached to the other node, we
 509          * don't need it anymore, and can free it. */
 510         if (other->meta.load_state != UNIT_STUB)
 511                 if (UNIT_VTABLE(other)->done)
 512                         UNIT_VTABLE(other)->done(other);
 513
 514         unit_add_to_dbus_queue(u);
 515         unit_add_to_cleanup_queue(other);
 516
 517         return 0;
 518 }
 519
 520 int unit_merge_by_name(Unit *u, const char *name) {
 521         Unit *other;
 522         int r;
 523         char *s = NULL;
 524
 525         assert(u);
 526         assert(name);
 527
 528         if (unit_name_is_template(name)) {
 529                 if (!u->meta.instance)
 530                         return -EINVAL;
 531
 532                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 533                         return -ENOMEM;
 534
 535                 name = s;
 536         }
 537
 538         if (!(other = manager_get_unit(u->meta.manager, name)))
 539                 r = unit_add_name(u, name);
 540         else
 541                 r = unit_merge(u, other);
 542
 543         free(s);
 544         return r;
 545 }
 546
 547 Unit* unit_follow_merge(Unit *u) {
 548         assert(u);
 549
 550         while (u->meta.load_state == UNIT_MERGED)
 551                 assert_se(u = u->meta.merged_into);
 552
 553         return u;
 554 }
 555
 556 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 557         int r;
 558
 559         assert(u);
 560         assert(c);
 561
 562         if (c->std_output != EXEC_OUTPUT_KMSG &&
 563             c->std_output != EXEC_OUTPUT_SYSLOG &&
 564             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 565             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 566             c->std_error != EXEC_OUTPUT_KMSG &&
 567             c->std_error != EXEC_OUTPUT_SYSLOG &&
 568             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 569             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 570                 return 0;
 571
 572         /* If syslog or kernel logging is requested, make sure our own
 573          * logging daemon is run first. */
 574
 575         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 576                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_STDOUT_SYSLOG_BRIDGE_SOCKET, NULL, true)) < 0)
 577                         return r;
 578
 579         return 0;
 580 }
 581
 582 const char *unit_description(Unit *u) {
 583         assert(u);
 584
 585         if (u->meta.description)
 586                 return u->meta.description;
 587
 588         return strna(u->meta.id);
 589 }
 590
 591 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 592         char *t;
 593         UnitDependency d;
 594         Iterator i;
 595         char *p2;
 596         const char *prefix2;
 597         char
 598                 timestamp1[FORMAT_TIMESTAMP_MAX],
 599                 timestamp2[FORMAT_TIMESTAMP_MAX],
 600                 timestamp3[FORMAT_TIMESTAMP_MAX],
 601                 timestamp4[FORMAT_TIMESTAMP_MAX],
 602                 timespan[FORMAT_TIMESPAN_MAX];
 603         Unit *following;
 604
 605         assert(u);
 606         assert(u->meta.type >= 0);
 607
 608         if (!prefix)
 609                 prefix = "";
 610         p2 = strappend(prefix, "\t");
 611         prefix2 = p2 ? p2 : prefix;
 612
 613         fprintf(f,
 614                 "%s-> Unit %s:\n"
 615                 "%s\tDescription: %s\n"
 616                 "%s\tInstance: %s\n"
 617                 "%s\tUnit Load State: %s\n"
 618                 "%s\tUnit Active State: %s\n"
 619                 "%s\tInactive Exit Timestamp: %s\n"
 620                 "%s\tActive Enter Timestamp: %s\n"
 621                 "%s\tActive Exit Timestamp: %s\n"
 622                 "%s\tInactive Enter Timestamp: %s\n"
 623                 "%s\tGC Check Good: %s\n"
 624                 "%s\tNeed Daemon Reload: %s\n",
 625                 prefix, u->meta.id,
 626                 prefix, unit_description(u),
 627                 prefix, strna(u->meta.instance),
 628                 prefix, unit_load_state_to_string(u->meta.load_state),
 629                 prefix, unit_active_state_to_string(unit_active_state(u)),
 630                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 631                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 632                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 633                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 634                 prefix, yes_no(unit_check_gc(u)),
 635                 prefix, yes_no(unit_need_daemon_reload(u)));
 636
 637         SET_FOREACH(t, u->meta.names, i)
 638                 fprintf(f, "%s\tName: %s\n", prefix, t);
 639
 640         if ((following = unit_following(u)))
 641                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 642
 643         if (u->meta.fragment_path)
 644                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 645
 646         if (u->meta.job_timeout > 0)
 647                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 648
 649         condition_dump_list(u->meta.conditions, f, prefix);
 650
 651         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
 652                 fprintf(f,
 653                         "%s\tCondition Timestamp: %s\n"
 654                         "%s\tCondition Result: %s\n",
 655                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
 656                         prefix, yes_no(u->meta.condition_result));
 657
 658         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 659                 Unit *other;
 660
 661                 SET_FOREACH(other, u->meta.dependencies[d], i)
 662                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 663         }
 664
 665         if (u->meta.load_state == UNIT_LOADED) {
 666                 CGroupBonding *b;
 667                 CGroupAttribute *a;
 668
 669                 fprintf(f,
 670                         "%s\tStopWhenUnneeded: %s\n"
 671                         "%s\tRefuseManualStart: %s\n"
 672                         "%s\tRefuseManualStop: %s\n"
 673                         "%s\tDefaultDependencies: %s\n"
 674                         "%s\tOnFailureIsolate: %s\n"
 675                         "%s\tIgnoreOnIsolate: %s\n"
 676                         "%s\tIgnoreOnSnapshot: %s\n",
 677                         prefix, yes_no(u->meta.stop_when_unneeded),
 678                         prefix, yes_no(u->meta.refuse_manual_start),
 679                         prefix, yes_no(u->meta.refuse_manual_stop),
 680                         prefix, yes_no(u->meta.default_dependencies),
 681                         prefix, yes_no(u->meta.on_failure_isolate),
 682                         prefix, yes_no(u->meta.ignore_on_isolate),
 683                         prefix, yes_no(u->meta.ignore_on_snapshot));
 684
 685                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 686                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 687                                 prefix, b->controller, b->path);
 688
 689                 LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes) {
 690                         char *v = NULL;
 691
 692                         if (a->map_callback)
 693                                 a->map_callback(a->controller, a->name, a->value, &v);
 694
 695                         fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
 696                                 prefix, a->controller, a->name, v ? v : a->value);
 697
 698                         free(v);
 699                 }
 700
 701                 if (UNIT_VTABLE(u)->dump)
 702                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 703
 704         } else if (u->meta.load_state == UNIT_MERGED)
 705                 fprintf(f,
 706                         "%s\tMerged into: %s\n",
 707                         prefix, u->meta.merged_into->meta.id);
 708         else if (u->meta.load_state == UNIT_ERROR)
 709                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 710
 711
 712         if (u->meta.job)
 713                 job_dump(u->meta.job, f, prefix2);
 714
 715         free(p2);
 716 }
 717
 718 /* Common implementation for multiple backends */
 719 int unit_load_fragment_and_dropin(Unit *u) {
 720         int r;
 721
 722         assert(u);
 723
 724         /* Load a .service file */
 725         if ((r = unit_load_fragment(u)) < 0)
 726                 return r;
 727
 728         if (u->meta.load_state == UNIT_STUB)
 729                 return -ENOENT;
 730
 731         /* Load drop-in directory data */
 732         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 733                 return r;
 734
 735         return 0;
 736 }
 737
 738 /* Common implementation for multiple backends */
 739 int unit_load_fragment_and_dropin_optional(Unit *u) {
 740         int r;
 741
 742         assert(u);
 743
 744         /* Same as unit_load_fragment_and_dropin(), but whether
 745          * something can be loaded or not doesn't matter. */
 746
 747         /* Load a .service file */
 748         if ((r = unit_load_fragment(u)) < 0)
 749                 return r;
 750
 751         if (u->meta.load_state == UNIT_STUB)
 752                 u->meta.load_state = UNIT_LOADED;
 753
 754         /* Load drop-in directory data */
 755         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 756                 return r;
 757
 758         return 0;
 759 }
 760
 761 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 762         assert(u);
 763         assert(target);
 764
 765         if (target->meta.type != UNIT_TARGET)
 766                 return 0;
 767
 768         /* Only add the dependency if both units are loaded, so that
 769          * that loop check below is reliable */
 770         if (u->meta.load_state != UNIT_LOADED ||
 771             target->meta.load_state != UNIT_LOADED)
 772                 return 0;
 773
 774         /* If either side wants no automatic dependencies, then let's
 775          * skip this */
 776         if (!u->meta.default_dependencies ||
 777             !target->meta.default_dependencies)
 778                 return 0;
 779
 780         /* Don't create loops */
 781         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 782                 return 0;
 783
 784         return unit_add_dependency(target, UNIT_AFTER, u, true);
 785 }
 786
 787 static int unit_add_default_dependencies(Unit *u) {
 788         static const UnitDependency deps[] = {
 789                 UNIT_REQUIRED_BY,
 790                 UNIT_REQUIRED_BY_OVERRIDABLE,
 791                 UNIT_WANTED_BY,
 792                 UNIT_BOUND_BY
 793         };
 794
 795         Unit *target;
 796         Iterator i;
 797         int r;
 798         unsigned k;
 799
 800         assert(u);
 801
 802         for (k = 0; k < ELEMENTSOF(deps); k++)
 803                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 804                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 805                                 return r;
 806
 807         return 0;
 808 }
 809
 810 int unit_load(Unit *u) {
 811         int r;
 812
 813         assert(u);
 814
 815         if (u->meta.in_load_queue) {
 816                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 817                 u->meta.in_load_queue = false;
 818         }
 819
 820         if (u->meta.type == _UNIT_TYPE_INVALID)
 821                 return -EINVAL;
 822
 823         if (u->meta.load_state != UNIT_STUB)
 824                 return 0;
 825
 826         if (UNIT_VTABLE(u)->load)
 827                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 828                         goto fail;
 829
 830         if (u->meta.load_state == UNIT_STUB) {
 831                 r = -ENOENT;
 832                 goto fail;
 833         }
 834
 835         if (u->meta.load_state == UNIT_LOADED &&
 836             u->meta.default_dependencies)
 837                 if ((r = unit_add_default_dependencies(u)) < 0)
 838                         goto fail;
 839
 840         if (u->meta.on_failure_isolate &&
 841             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
 842
 843                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 844                           u->meta.id);
 845
 846                 r = -EINVAL;
 847                 goto fail;
 848         }
 849
 850         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 851
 852         unit_add_to_dbus_queue(unit_follow_merge(u));
 853         unit_add_to_gc_queue(u);
 854
 855         return 0;
 856
 857 fail:
 858         u->meta.load_state = UNIT_ERROR;
 859         u->meta.load_error = r;
 860         unit_add_to_dbus_queue(u);
 861         unit_add_to_gc_queue(u);
 862
 863         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 864
 865         return r;
 866 }
 867
 868 bool unit_condition_test(Unit *u) {
 869         assert(u);
 870
 871         dual_timestamp_get(&u->meta.condition_timestamp);
 872         u->meta.condition_result = condition_test_list(u->meta.conditions);
 873
 874         return u->meta.condition_result;
 875 }
 876
 877 /* Errors:
 878  *         -EBADR:     This unit type does not support starting.
 879  *         -EALREADY:  Unit is already started.
 880  *         -EAGAIN:    An operation is already in progress. Retry later.
 881  *         -ECANCELED: Too many requests for now.
 882  */
 883 int unit_start(Unit *u) {
 884         UnitActiveState state;
 885         Unit *following;
 886
 887         assert(u);
 888
 889         if (u->meta.load_state != UNIT_LOADED)
 890                 return -EINVAL;
 891
 892         /* If this is already started, then this will succeed. Note
 893          * that this will even succeed if this unit is not startable
 894          * by the user. This is relied on to detect when we need to
 895          * wait for units and when waiting is finished. */
 896         state = unit_active_state(u);
 897         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 898                 return -EALREADY;
 899
 900         /* If the conditions failed, don't do anything at all. If we
 901          * already are activating this call might still be useful to
 902          * speed up activation in case there is some hold-off time,
 903          * but we don't want to recheck the condition in that case. */
 904         if (state != UNIT_ACTIVATING &&
 905             !unit_condition_test(u)) {
 906                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 907                 return -EALREADY;
 908         }
 909
 910         /* Forward to the main object, if we aren't it. */
 911         if ((following = unit_following(u))) {
 912                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 913                 return unit_start(following);
 914         }
 915
 916         /* If it is stopped, but we cannot start it, then fail */
 917         if (!UNIT_VTABLE(u)->start)
 918                 return -EBADR;
 919
 920         /* We don't suppress calls to ->start() here when we are
 921          * already starting, to allow this request to be used as a
 922          * "hurry up" call, for example when the unit is in some "auto
 923          * restart" state where it waits for a holdoff timer to elapse
 924          * before it will start again. */
 925
 926         unit_add_to_dbus_queue(u);
 927
 928         unit_status_printf(u, NULL, "Starting %s...", unit_description(u));
 929         return UNIT_VTABLE(u)->start(u);
 930 }
 931
 932 bool unit_can_start(Unit *u) {
 933         assert(u);
 934
 935         return !!UNIT_VTABLE(u)->start;
 936 }
 937
 938 bool unit_can_isolate(Unit *u) {
 939         assert(u);
 940
 941         return unit_can_start(u) &&
 942                 u->meta.allow_isolate;
 943 }
 944
 945 /* Errors:
 946  *         -EBADR:    This unit type does not support stopping.
 947  *         -EALREADY: Unit is already stopped.
 948  *         -EAGAIN:   An operation is already in progress. Retry later.
 949  */
 950 int unit_stop(Unit *u) {
 951         UnitActiveState state;
 952         Unit *following;
 953
 954         assert(u);
 955
 956         state = unit_active_state(u);
 957         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 958                 return -EALREADY;
 959
 960         if ((following = unit_following(u))) {
 961                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 962                 return unit_stop(following);
 963         }
 964
 965         if (!UNIT_VTABLE(u)->stop)
 966                 return -EBADR;
 967
 968         unit_add_to_dbus_queue(u);
 969
 970         unit_status_printf(u, NULL, "Stopping %s...", unit_description(u));
 971         return UNIT_VTABLE(u)->stop(u);
 972 }
 973
 974 /* Errors:
 975  *         -EBADR:    This unit type does not support reloading.
 976  *         -ENOEXEC:  Unit is not started.
 977  *         -EAGAIN:   An operation is already in progress. Retry later.
 978  */
 979 int unit_reload(Unit *u) {
 980         UnitActiveState state;
 981         Unit *following;
 982
 983         assert(u);
 984
 985         if (u->meta.load_state != UNIT_LOADED)
 986                 return -EINVAL;
 987
 988         if (!unit_can_reload(u))
 989                 return -EBADR;
 990
 991         state = unit_active_state(u);
 992         if (state == UNIT_RELOADING)
 993                 return -EALREADY;
 994
 995         if (state != UNIT_ACTIVE)
 996                 return -ENOEXEC;
 997
 998         if ((following = unit_following(u))) {
 999                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
1000                 return unit_reload(following);
1001         }
1002
1003         unit_add_to_dbus_queue(u);
1004         return UNIT_VTABLE(u)->reload(u);
1005 }
1006
1007 bool unit_can_reload(Unit *u) {
1008         assert(u);
1009
1010         if (!UNIT_VTABLE(u)->reload)
1011                 return false;
1012
1013         if (!UNIT_VTABLE(u)->can_reload)
1014                 return true;
1015
1016         return UNIT_VTABLE(u)->can_reload(u);
1017 }
1018
1019 static void unit_check_unneeded(Unit *u) {
1020         Iterator i;
1021         Unit *other;
1022
1023         assert(u);
1024
1025         /* If this service shall be shut down when unneeded then do
1026          * so. */
1027
1028         if (!u->meta.stop_when_unneeded)
1029                 return;
1030
1031         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1032                 return;
1033
1034         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1035                 if (unit_pending_active(other))
1036                         return;
1037
1038         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1039                 if (unit_pending_active(other))
1040                         return;
1041
1042         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1043                 if (unit_pending_active(other))
1044                         return;
1045
1046         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1047                 if (unit_pending_active(other))
1048                         return;
1049
1050         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1051
1052         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1053         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1054 }
1055
1056 static void retroactively_start_dependencies(Unit *u) {
1057         Iterator i;
1058         Unit *other;
1059
1060         assert(u);
1061         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1062
1063         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1064                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1065                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1066                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1067
1068         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1069                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1070                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1071                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1072
1073         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1074                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1075                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1076                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1077
1078         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1079                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1080                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1081                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1082
1083         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1084                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1085                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1086                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1087
1088         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1089                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1090                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1091
1092         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1093                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1094                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1095 }
1096
1097 static void retroactively_stop_dependencies(Unit *u) {
1098         Iterator i;
1099         Unit *other;
1100
1101         assert(u);
1102         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1103
1104         /* Pull down units which are bound to us recursively if enabled */
1105         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1106                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1107                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1108
1109         /* Garbage collect services that might not be needed anymore, if enabled */
1110         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1111                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1112                         unit_check_unneeded(other);
1113         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1114                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1115                         unit_check_unneeded(other);
1116         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1117                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1118                         unit_check_unneeded(other);
1119         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1120                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1121                         unit_check_unneeded(other);
1122         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1123                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1124                         unit_check_unneeded(other);
1125         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1126                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1127                         unit_check_unneeded(other);
1128 }
1129
1130 void unit_trigger_on_failure(Unit *u) {
1131         Unit *other;
1132         Iterator i;
1133
1134         assert(u);
1135
1136         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1137                 return;
1138
1139         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1140
1141         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1142                 int r;
1143
1144                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1145                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1146         }
1147 }
1148
1149 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1150         bool unexpected;
1151
1152         assert(u);
1153         assert(os < _UNIT_ACTIVE_STATE_MAX);
1154         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1155
1156         /* Note that this is called for all low-level state changes,
1157          * even if they might map to the same high-level
1158          * UnitActiveState! That means that ns == os is OK an expected
1159          * behaviour here. For example: if a mount point is remounted
1160          * this function will be called too! */
1161
1162         if (u->meta.manager->n_reloading <= 0) {
1163                 dual_timestamp ts;
1164
1165                 dual_timestamp_get(&ts);
1166
1167                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1168                         u->meta.inactive_exit_timestamp = ts;
1169                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1170                         u->meta.inactive_enter_timestamp = ts;
1171
1172                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1173                         u->meta.active_enter_timestamp = ts;
1174                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1175                         u->meta.active_exit_timestamp = ts;
1176
1177                 timer_unit_notify(u, ns);
1178                 path_unit_notify(u, ns);
1179         }
1180
1181         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1182                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1183
1184         if (u->meta.job) {
1185                 unexpected = false;
1186
1187                 if (u->meta.job->state == JOB_WAITING)
1188
1189                         /* So we reached a different state for this
1190                          * job. Let's see if we can run it now if it
1191                          * failed previously due to EAGAIN. */
1192                         job_add_to_run_queue(u->meta.job);
1193
1194                 /* Let's check whether this state change constitutes a
1195                  * finished job, or maybe contradicts a running job and
1196                  * hence needs to invalidate jobs. */
1197
1198                 switch (u->meta.job->type) {
1199
1200                 case JOB_START:
1201                 case JOB_VERIFY_ACTIVE:
1202
1203                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1204                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1205                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1206                                 unexpected = true;
1207
1208                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1209                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1210                         }
1211
1212                         break;
1213
1214                 case JOB_RELOAD:
1215                 case JOB_RELOAD_OR_START:
1216
1217                         if (u->meta.job->state == JOB_RUNNING) {
1218                                 if (ns == UNIT_ACTIVE)
1219                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1220                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1221                                         unexpected = true;
1222
1223                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1224                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1225                                 }
1226                         }
1227
1228                         break;
1229
1230                 case JOB_STOP:
1231                 case JOB_RESTART:
1232                 case JOB_TRY_RESTART:
1233
1234                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1235                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1236                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1237                                 unexpected = true;
1238                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1239                         }
1240
1241                         break;
1242
1243                 default:
1244                         assert_not_reached("Job type unknown");
1245                 }
1246
1247         } else
1248                 unexpected = true;
1249
1250         if (u->meta.manager->n_reloading <= 0) {
1251
1252                 /* If this state change happened without being
1253                  * requested by a job, then let's retroactively start
1254                  * or stop dependencies. We skip that step when
1255                  * deserializing, since we don't want to create any
1256                  * additional jobs just because something is already
1257                  * activated. */
1258
1259                 if (unexpected) {
1260                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1261                                 retroactively_start_dependencies(u);
1262                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1263                                 retroactively_stop_dependencies(u);
1264                 }
1265
1266                 if (ns != os && ns == UNIT_FAILED) {
1267                         log_notice("Unit %s entered failed state.", u->meta.id);
1268                         unit_trigger_on_failure(u);
1269                 }
1270         }
1271
1272         /* Some names are special */
1273         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1274
1275                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1276                         /* The bus just might have become available,
1277                          * hence try to connect to it, if we aren't
1278                          * yet connected. */
1279                         bus_init(u->meta.manager, true);
1280
1281                 if (u->meta.type == UNIT_SERVICE &&
1282                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1283                     u->meta.manager->n_reloading <= 0) {
1284                         /* Write audit record if we have just finished starting up */
1285                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1286                         u->meta.in_audit = true;
1287                 }
1288
1289                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1290                         manager_send_unit_plymouth(u->meta.manager, u);
1291
1292         } else {
1293
1294                 /* We don't care about D-Bus here, since we'll get an
1295                  * asynchronous notification for it anyway. */
1296
1297                 if (u->meta.type == UNIT_SERVICE &&
1298                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1299                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1300                     u->meta.manager->n_reloading <= 0) {
1301
1302                         /* Hmm, if there was no start record written
1303                          * write it now, so that we always have a nice
1304                          * pair */
1305                         if (!u->meta.in_audit) {
1306                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1307
1308                                 if (ns == UNIT_INACTIVE)
1309                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1310                         } else
1311                                 /* Write audit record if we have just finished shutting down */
1312                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1313
1314                         u->meta.in_audit = false;
1315                 }
1316         }
1317
1318         manager_recheck_syslog(u->meta.manager);
1319
1320         /* Maybe we finished startup and are now ready for being
1321          * stopped because unneeded? */
1322         unit_check_unneeded(u);
1323
1324         unit_add_to_dbus_queue(u);
1325         unit_add_to_gc_queue(u);
1326 }
1327
1328 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1329         struct epoll_event ev;
1330
1331         assert(u);
1332         assert(fd >= 0);
1333         assert(w);
1334         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1335
1336         zero(ev);
1337         ev.data.ptr = w;
1338         ev.events = events;
1339
1340         if (epoll_ctl(u->meta.manager->epoll_fd,
1341                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1342                       fd,
1343                       &ev) < 0)
1344                 return -errno;
1345
1346         w->fd = fd;
1347         w->type = WATCH_FD;
1348         w->data.unit = u;
1349
1350         return 0;
1351 }
1352
1353 void unit_unwatch_fd(Unit *u, Watch *w) {
1354         assert(u);
1355         assert(w);
1356
1357         if (w->type == WATCH_INVALID)
1358                 return;
1359
1360         assert(w->type == WATCH_FD);
1361         assert(w->data.unit == u);
1362         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1363
1364         w->fd = -1;
1365         w->type = WATCH_INVALID;
1366         w->data.unit = NULL;
1367 }
1368
1369 int unit_watch_pid(Unit *u, pid_t pid) {
1370         assert(u);
1371         assert(pid >= 1);
1372
1373         /* Watch a specific PID. We only support one unit watching
1374          * each PID for now. */
1375
1376         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1377 }
1378
1379 void unit_unwatch_pid(Unit *u, pid_t pid) {
1380         assert(u);
1381         assert(pid >= 1);
1382
1383         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1384 }
1385
1386 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1387         struct itimerspec its;
1388         int flags, fd;
1389         bool ours;
1390
1391         assert(u);
1392         assert(w);
1393         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1394
1395         /* This will try to reuse the old timer if there is one */
1396
1397         if (w->type == WATCH_UNIT_TIMER) {
1398                 assert(w->data.unit == u);
1399                 assert(w->fd >= 0);
1400
1401                 ours = false;
1402                 fd = w->fd;
1403         } else if (w->type == WATCH_INVALID) {
1404
1405                 ours = true;
1406                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1407                         return -errno;
1408         } else
1409                 assert_not_reached("Invalid watch type");
1410
1411         zero(its);
1412
1413         if (delay <= 0) {
1414                 /* Set absolute time in the past, but not 0, since we
1415                  * don't want to disarm the timer */
1416                 its.it_value.tv_sec = 0;
1417                 its.it_value.tv_nsec = 1;
1418
1419                 flags = TFD_TIMER_ABSTIME;
1420         } else {
1421                 timespec_store(&its.it_value, delay);
1422                 flags = 0;
1423         }
1424
1425         /* This will also flush the elapse counter */
1426         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1427                 goto fail;
1428
1429         if (w->type == WATCH_INVALID) {
1430                 struct epoll_event ev;
1431
1432                 zero(ev);
1433                 ev.data.ptr = w;
1434                 ev.events = EPOLLIN;
1435
1436                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1437                         goto fail;
1438         }
1439
1440         w->type = WATCH_UNIT_TIMER;
1441         w->fd = fd;
1442         w->data.unit = u;
1443
1444         return 0;
1445
1446 fail:
1447         if (ours)
1448                 close_nointr_nofail(fd);
1449
1450         return -errno;
1451 }
1452
1453 void unit_unwatch_timer(Unit *u, Watch *w) {
1454         assert(u);
1455         assert(w);
1456
1457         if (w->type == WATCH_INVALID)
1458                 return;
1459
1460         assert(w->type == WATCH_UNIT_TIMER);
1461         assert(w->data.unit == u);
1462         assert(w->fd >= 0);
1463
1464         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1465         close_nointr_nofail(w->fd);
1466
1467         w->fd = -1;
1468         w->type = WATCH_INVALID;
1469         w->data.unit = NULL;
1470 }
1471
1472 bool unit_job_is_applicable(Unit *u, JobType j) {
1473         assert(u);
1474         assert(j >= 0 && j < _JOB_TYPE_MAX);
1475
1476         switch (j) {
1477
1478         case JOB_VERIFY_ACTIVE:
1479         case JOB_START:
1480         case JOB_STOP:
1481                 return true;
1482
1483         case JOB_RESTART:
1484         case JOB_TRY_RESTART:
1485                 return unit_can_start(u);
1486
1487         case JOB_RELOAD:
1488                 return unit_can_reload(u);
1489
1490         case JOB_RELOAD_OR_START:
1491                 return unit_can_reload(u) && unit_can_start(u);
1492
1493         default:
1494                 assert_not_reached("Invalid job type");
1495         }
1496 }
1497
1498 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1499
1500         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1501                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1502                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1503                 [UNIT_WANTS] = UNIT_WANTED_BY,
1504                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1505                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1506                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1507                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1508                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1509                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1510                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1511                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1512                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1513                 [UNIT_BEFORE] = UNIT_AFTER,
1514                 [UNIT_AFTER] = UNIT_BEFORE,
1515                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1516                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1517                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1518         };
1519         int r, q = 0, v = 0, w = 0;
1520
1521         assert(u);
1522         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1523         assert(other);
1524
1525         u = unit_follow_merge(u);
1526         other = unit_follow_merge(other);
1527
1528         /* We won't allow dependencies on ourselves. We will not
1529          * consider them an error however. */
1530         if (u == other)
1531                 return 0;
1532
1533         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1534                 return r;
1535
1536         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1537                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1538                         return r;
1539
1540         if (add_reference)
1541                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1542                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1543                         return r;
1544
1545         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1546                 return q;
1547
1548         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1549                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1550                         r = v;
1551                         goto fail;
1552                 }
1553
1554         if (add_reference) {
1555                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1556                         r = w;
1557                         goto fail;
1558                 }
1559
1560                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1561                         goto fail;
1562         }
1563
1564         unit_add_to_dbus_queue(u);
1565         return 0;
1566
1567 fail:
1568         if (q > 0)
1569                 set_remove(u->meta.dependencies[d], other);
1570
1571         if (v > 0)
1572                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1573
1574         if (w > 0)
1575                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1576
1577         return r;
1578 }
1579
1580 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1581         int r;
1582
1583         assert(u);
1584
1585         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1586                 return r;
1587
1588         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1589                 return r;
1590
1591         return 0;
1592 }
1593
1594 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1595         char *s;
1596
1597         assert(u);
1598         assert(name || path);
1599
1600         if (!name)
1601                 name = file_name_from_path(path);
1602
1603         if (!unit_name_is_template(name)) {
1604                 *p = NULL;
1605                 return name;
1606         }
1607
1608         if (u->meta.instance)
1609                 s = unit_name_replace_instance(name, u->meta.instance);
1610         else {
1611                 char *i;
1612
1613                 if (!(i = unit_name_to_prefix(u->meta.id)))
1614                         return NULL;
1615
1616                 s = unit_name_replace_instance(name, i);
1617                 free(i);
1618         }
1619
1620         if (!s)
1621                 return NULL;
1622
1623         *p = s;
1624         return s;
1625 }
1626
1627 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1628         Unit *other;
1629         int r;
1630         char *s;
1631
1632         assert(u);
1633         assert(name || path);
1634
1635         if (!(name = resolve_template(u, name, path, &s)))
1636                 return -ENOMEM;
1637
1638         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1639                 goto finish;
1640
1641         r = unit_add_dependency(u, d, other, add_reference);
1642
1643 finish:
1644         free(s);
1645         return r;
1646 }
1647
1648 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1649         Unit *other;
1650         int r;
1651         char *s;
1652
1653         assert(u);
1654         assert(name || path);
1655
1656         if (!(name = resolve_template(u, name, path, &s)))
1657                 return -ENOMEM;
1658
1659         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1660                 goto finish;
1661
1662         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1663
1664 finish:
1665         free(s);
1666         return r;
1667 }
1668
1669 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1670         Unit *other;
1671         int r;
1672         char *s;
1673
1674         assert(u);
1675         assert(name || path);
1676
1677         if (!(name = resolve_template(u, name, path, &s)))
1678                 return -ENOMEM;
1679
1680         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1681                 goto finish;
1682
1683         r = unit_add_dependency(other, d, u, add_reference);
1684
1685 finish:
1686         free(s);
1687         return r;
1688 }
1689
1690 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1691         Unit *other;
1692         int r;
1693         char *s;
1694
1695         assert(u);
1696         assert(name || path);
1697
1698         if (!(name = resolve_template(u, name, path, &s)))
1699                 return -ENOMEM;
1700
1701         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1702                 goto finish;
1703
1704         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1705                 goto finish;
1706
1707 finish:
1708         free(s);
1709         return r;
1710 }
1711
1712 int set_unit_path(const char *p) {
1713         char *cwd, *c;
1714         int r;
1715
1716         /* This is mostly for debug purposes */
1717
1718         if (path_is_absolute(p)) {
1719                 if (!(c = strdup(p)))
1720                         return -ENOMEM;
1721         } else {
1722                 if (!(cwd = get_current_dir_name()))
1723                         return -errno;
1724
1725                 r = asprintf(&c, "%s/%s", cwd, p);
1726                 free(cwd);
1727
1728                 if (r < 0)
1729                         return -ENOMEM;
1730         }
1731
1732         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1733                 r = -errno;
1734                 free(c);
1735                 return r;
1736         }
1737
1738         return 0;
1739 }
1740
1741 char *unit_dbus_path(Unit *u) {
1742         char *p, *e;
1743
1744         assert(u);
1745
1746         if (!u->meta.id)
1747                 return NULL;
1748
1749         if (!(e = bus_path_escape(u->meta.id)))
1750                 return NULL;
1751
1752         p = strappend("/org/freedesktop/systemd1/unit/", e);
1753         free(e);
1754
1755         return p;
1756 }
1757
1758 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1759         int r;
1760
1761         assert(u);
1762         assert(b);
1763
1764         assert(b->path);
1765
1766         if (!b->controller) {
1767                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1768                         return -ENOMEM;
1769
1770                 b->ours = true;
1771         }
1772
1773         /* Ensure this hasn't been added yet */
1774         assert(!b->unit);
1775
1776         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1777                 CGroupBonding *l;
1778
1779                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1780                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1781
1782                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1783                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1784                         return r;
1785                 }
1786         }
1787
1788         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1789         b->unit = u;
1790
1791         return 0;
1792 }
1793
1794 static char *default_cgroup_path(Unit *u) {
1795         char *p;
1796
1797         assert(u);
1798
1799         if (u->meta.instance) {
1800                 char *t;
1801
1802                 t = unit_name_template(u->meta.id);
1803                 if (!t)
1804                         return NULL;
1805
1806                 p = join(u->meta.manager->cgroup_hierarchy, "/", t, "/", u->meta.instance, NULL);
1807                 free(t);
1808         } else
1809                 p = join(u->meta.manager->cgroup_hierarchy, "/", u->meta.id, NULL);
1810
1811         return p;
1812 }
1813
1814 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1815         char *controller = NULL, *path = NULL;
1816         CGroupBonding *b = NULL;
1817         bool ours = false;
1818         int r;
1819
1820         assert(u);
1821         assert(name);
1822
1823         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1824                 return r;
1825
1826         if (!path) {
1827                 path = default_cgroup_path(u);
1828                 ours = true;
1829         }
1830
1831         if (!controller) {
1832                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1833                 ours = true;
1834         }
1835
1836         if (!path || !controller) {
1837                 free(path);
1838                 free(controller);
1839
1840                 return -ENOMEM;
1841         }
1842
1843         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1844                 r = -EEXIST;
1845                 goto fail;
1846         }
1847
1848         if (!(b = new0(CGroupBonding, 1))) {
1849                 r = -ENOMEM;
1850                 goto fail;
1851         }
1852
1853         b->controller = controller;
1854         b->path = path;
1855         b->ours = ours;
1856         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1857
1858         if ((r = unit_add_cgroup(u, b)) < 0)
1859                 goto fail;
1860
1861         return 0;
1862
1863 fail:
1864         free(path);
1865         free(controller);
1866         free(b);
1867
1868         return r;
1869 }
1870
1871 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1872         CGroupBonding *b = NULL;
1873         int r = -ENOMEM;
1874
1875         assert(u);
1876
1877         if (!controller)
1878                 controller = SYSTEMD_CGROUP_CONTROLLER;
1879
1880         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1881                 return 0;
1882
1883         if (!(b = new0(CGroupBonding, 1)))
1884                 return -ENOMEM;
1885
1886         if (!(b->controller = strdup(controller)))
1887                 goto fail;
1888
1889         if (!(b->path = default_cgroup_path(u)))
1890                 goto fail;
1891
1892         b->ours = true;
1893         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1894
1895         if ((r = unit_add_cgroup(u, b)) < 0)
1896                 goto fail;
1897
1898         return 0;
1899
1900 fail:
1901         free(b->path);
1902         free(b->controller);
1903         free(b);
1904
1905         return r;
1906 }
1907
1908 int unit_add_default_cgroups(Unit *u) {
1909         CGroupAttribute *a;
1910         char **c;
1911         int r;
1912
1913         assert(u);
1914
1915         /* Adds in the default cgroups, if they weren't specified
1916          * otherwise. */
1917
1918         if (!u->meta.manager->cgroup_hierarchy)
1919                 return 0;
1920
1921         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1922                 return r;
1923
1924         STRV_FOREACH(c, u->meta.manager->default_controllers)
1925                 unit_add_one_default_cgroup(u, *c);
1926
1927         LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes)
1928                 unit_add_one_default_cgroup(u, a->controller);
1929
1930         return 0;
1931 }
1932
1933 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1934         assert(u);
1935
1936         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1937 }
1938
1939 int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback) {
1940         int r;
1941         char *c = NULL;
1942         CGroupAttribute *a;
1943
1944         assert(u);
1945         assert(name);
1946         assert(value);
1947
1948         if (!controller) {
1949                 const char *dot;
1950
1951                 dot = strchr(name, '.');
1952                 if (!dot)
1953                         return -EINVAL;
1954
1955                 c = strndup(name, dot - name);
1956                 if (!c)
1957                         return -ENOMEM;
1958
1959                 controller = c;
1960         }
1961
1962         if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
1963                 r = -EINVAL;
1964                 goto finish;
1965         }
1966
1967         a = new0(CGroupAttribute, 1);
1968         if (!a) {
1969                 r = -ENOMEM;
1970                 goto finish;
1971         }
1972
1973         if (c) {
1974                 a->controller = c;
1975                 c = NULL;
1976         } else
1977                 a->controller = strdup(controller);
1978
1979         a->name = strdup(name);
1980         a->value = strdup(value);
1981
1982         if (!a->controller || !a->name || !a->value) {
1983                 free(a->controller);
1984                 free(a->name);
1985                 free(a->value);
1986                 free(a);
1987
1988                 return -ENOMEM;
1989         }
1990
1991         a->map_callback = map_callback;
1992
1993         LIST_PREPEND(CGroupAttribute, by_unit, u->meta.cgroup_attributes, a);
1994
1995         r = 0;
1996
1997 finish:
1998         free(c);
1999         return r;
2000 }
2001
2002 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2003         char *t;
2004         int r;
2005
2006         assert(u);
2007         assert(type);
2008         assert(_found);
2009
2010         if (!(t = unit_name_change_suffix(u->meta.id, type)))
2011                 return -ENOMEM;
2012
2013         assert(!unit_has_name(u, t));
2014
2015         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
2016         free(t);
2017
2018         assert(r < 0 || *_found != u);
2019
2020         return r;
2021 }
2022
2023 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2024         Unit *found;
2025         char *t;
2026
2027         assert(u);
2028         assert(type);
2029         assert(_found);
2030
2031         if (!(t = unit_name_change_suffix(u->meta.id, type)))
2032                 return -ENOMEM;
2033
2034         assert(!unit_has_name(u, t));
2035
2036         found = manager_get_unit(u->meta.manager, t);
2037         free(t);
2038
2039         if (!found)
2040                 return -ENOENT;
2041
2042         *_found = found;
2043         return 0;
2044 }
2045
2046 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
2047         Unit *u = userdata;
2048         assert(u);
2049
2050         return unit_name_to_prefix_and_instance(u->meta.id);
2051 }
2052
2053 static char *specifier_prefix(char specifier, void *data, void *userdata) {
2054         Unit *u = userdata;
2055         assert(u);
2056
2057         return unit_name_to_prefix(u->meta.id);
2058 }
2059
2060 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
2061         Unit *u = userdata;
2062         char *p, *r;
2063
2064         assert(u);
2065
2066         if (!(p = unit_name_to_prefix(u->meta.id)))
2067                 return NULL;
2068
2069         r = unit_name_unescape(p);
2070         free(p);
2071
2072         return r;
2073 }
2074
2075 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
2076         Unit *u = userdata;
2077         assert(u);
2078
2079         if (u->meta.instance)
2080                 return unit_name_unescape(u->meta.instance);
2081
2082         return strdup("");
2083 }
2084
2085 static char *specifier_filename(char specifier, void *data, void *userdata) {
2086         Unit *u = userdata;
2087         assert(u);
2088
2089         if (u->meta.instance)
2090                 return unit_name_path_unescape(u->meta.instance);
2091
2092         return unit_name_to_path(u->meta.instance);
2093 }
2094
2095 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2096         Unit *u = userdata;
2097         assert(u);
2098
2099         return default_cgroup_path(u);
2100 }
2101
2102 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2103         Unit *u = userdata;
2104         char *p;
2105         assert(u);
2106
2107         if (specifier == 'r')
2108                 return strdup(u->meta.manager->cgroup_hierarchy);
2109
2110         if (parent_of_path(u->meta.manager->cgroup_hierarchy, &p) < 0)
2111                 return strdup("");
2112
2113         if (streq(p, "/")) {
2114                 free(p);
2115                 return strdup("");
2116         }
2117
2118         return p;
2119 }
2120
2121 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2122         Unit *u = userdata;
2123         assert(u);
2124
2125         if (u->meta.manager->running_as == MANAGER_USER) {
2126                 const char *e;
2127
2128                 e = getenv("XDG_RUNTIME_DIR");
2129                 if (e)
2130                         return strdup(e);
2131         }
2132
2133         return strdup("/run");
2134 }
2135
2136 char *unit_name_printf(Unit *u, const char* format) {
2137
2138         /*
2139          * This will use the passed string as format string and
2140          * replace the following specifiers:
2141          *
2142          * %n: the full id of the unit                 (foo@bar.waldo)
2143          * %N: the id of the unit without the suffix   (foo@bar)
2144          * %p: the prefix                              (foo)
2145          * %i: the instance                            (bar)
2146          */
2147
2148         const Specifier table[] = {
2149                 { 'n', specifier_string,              u->meta.id },
2150                 { 'N', specifier_prefix_and_instance, NULL },
2151                 { 'p', specifier_prefix,              NULL },
2152                 { 'i', specifier_string,              u->meta.instance },
2153                 { 0, NULL, NULL }
2154         };
2155
2156         assert(u);
2157         assert(format);
2158
2159         return specifier_printf(format, table, u);
2160 }
2161
2162 char *unit_full_printf(Unit *u, const char *format) {
2163
2164         /* This is similar to unit_name_printf() but also supports
2165          * unescaping. Also, adds a couple of additional codes:
2166          *
2167          * %c cgroup path of unit
2168          * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2169          * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2170          * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2171          */
2172
2173         const Specifier table[] = {
2174                 { 'n', specifier_string,              u->meta.id },
2175                 { 'N', specifier_prefix_and_instance, NULL },
2176                 { 'p', specifier_prefix,              NULL },
2177                 { 'P', specifier_prefix_unescaped,    NULL },
2178                 { 'i', specifier_string,              u->meta.instance },
2179                 { 'I', specifier_instance_unescaped,  NULL },
2180                 { 'f', specifier_filename,            NULL },
2181                 { 'c', specifier_cgroup,              NULL },
2182                 { 'r', specifier_cgroup_root,         NULL },
2183                 { 'R', specifier_cgroup_root,         NULL },
2184                 { 't', specifier_runtime,             NULL },
2185                 { 0, NULL, NULL }
2186         };
2187
2188         assert(u);
2189         assert(format);
2190
2191         return specifier_printf(format, table, u);
2192 }
2193
2194 char **unit_full_printf_strv(Unit *u, char **l) {
2195         size_t n;
2196         char **r, **i, **j;
2197
2198         /* Applies unit_full_printf to every entry in l */
2199
2200         assert(u);
2201
2202         n = strv_length(l);
2203         if (!(r = new(char*, n+1)))
2204                 return NULL;
2205
2206         for (i = l, j = r; *i; i++, j++)
2207                 if (!(*j = unit_full_printf(u, *i)))
2208                         goto fail;
2209
2210         *j = NULL;
2211         return r;
2212
2213 fail:
2214         for (j--; j >= r; j--)
2215                 free(*j);
2216
2217         free(r);
2218
2219         return NULL;
2220 }
2221
2222 int unit_watch_bus_name(Unit *u, const char *name) {
2223         assert(u);
2224         assert(name);
2225
2226         /* Watch a specific name on the bus. We only support one unit
2227          * watching each name for now. */
2228
2229         return hashmap_put(u->meta.manager->watch_bus, name, u);
2230 }
2231
2232 void unit_unwatch_bus_name(Unit *u, const char *name) {
2233         assert(u);
2234         assert(name);
2235
2236         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2237 }
2238
2239 bool unit_can_serialize(Unit *u) {
2240         assert(u);
2241
2242         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2243 }
2244
2245 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2246         int r;
2247
2248         assert(u);
2249         assert(f);
2250         assert(fds);
2251
2252         if (!unit_can_serialize(u))
2253                 return 0;
2254
2255         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2256                 return r;
2257
2258         if (u->meta.job)
2259                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2260
2261         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2262         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2263         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2264         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2265         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2266
2267         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2268                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2269
2270         /* End marker */
2271         fputc('\n', f);
2272         return 0;
2273 }
2274
2275 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2276         va_list ap;
2277
2278         assert(u);
2279         assert(f);
2280         assert(key);
2281         assert(format);
2282
2283         fputs(key, f);
2284         fputc('=', f);
2285
2286         va_start(ap, format);
2287         vfprintf(f, format, ap);
2288         va_end(ap);
2289
2290         fputc('\n', f);
2291 }
2292
2293 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2294         assert(u);
2295         assert(f);
2296         assert(key);
2297         assert(value);
2298
2299         fprintf(f, "%s=%s\n", key, value);
2300 }
2301
2302 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2303         int r;
2304
2305         assert(u);
2306         assert(f);
2307         assert(fds);
2308
2309         if (!unit_can_serialize(u))
2310                 return 0;
2311
2312         for (;;) {
2313                 char line[LINE_MAX], *l, *v;
2314                 size_t k;
2315
2316                 if (!fgets(line, sizeof(line), f)) {
2317                         if (feof(f))
2318                                 return 0;
2319                         return -errno;
2320                 }
2321
2322                 char_array_0(line);
2323                 l = strstrip(line);
2324
2325                 /* End marker */
2326                 if (l[0] == 0)
2327                         return 0;
2328
2329                 k = strcspn(l, "=");
2330
2331                 if (l[k] == '=') {
2332                         l[k] = 0;
2333                         v = l+k+1;
2334                 } else
2335                         v = l+k;
2336
2337                 if (streq(l, "job")) {
2338                         JobType type;
2339
2340                         if ((type = job_type_from_string(v)) < 0)
2341                                 log_debug("Failed to parse job type value %s", v);
2342                         else
2343                                 u->meta.deserialized_job = type;
2344
2345                         continue;
2346                 } else if (streq(l, "inactive-exit-timestamp")) {
2347                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2348                         continue;
2349                 } else if (streq(l, "active-enter-timestamp")) {
2350                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2351                         continue;
2352                 } else if (streq(l, "active-exit-timestamp")) {
2353                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2354                         continue;
2355                 } else if (streq(l, "inactive-enter-timestamp")) {
2356                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2357                         continue;
2358                 } else if (streq(l, "condition-timestamp")) {
2359                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2360                         continue;
2361                 } else if (streq(l, "condition-result")) {
2362                         int b;
2363
2364                         if ((b = parse_boolean(v)) < 0)
2365                                 log_debug("Failed to parse condition result value %s", v);
2366                         else
2367                                 u->meta.condition_result = b;
2368
2369                         continue;
2370                 }
2371
2372                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2373                         return r;
2374         }
2375 }
2376
2377 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2378         Unit *device;
2379         char *e;
2380         int r;
2381
2382         assert(u);
2383
2384         if (!what)
2385                 return 0;
2386
2387         /* Adds in links to the device node that this unit is based on */
2388
2389         if (!is_device_path(what))
2390                 return 0;
2391
2392         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2393                 return -ENOMEM;
2394
2395         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2396         free(e);
2397
2398         if (r < 0)
2399                 return r;
2400
2401         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2402                 return r;
2403
2404         if (wants)
2405                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2406                         return r;
2407
2408         return 0;
2409 }
2410
2411 int unit_coldplug(Unit *u) {
2412         int r;
2413
2414         assert(u);
2415
2416         if (UNIT_VTABLE(u)->coldplug)
2417                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2418                         return r;
2419
2420         if (u->meta.deserialized_job >= 0) {
2421                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2422                         return r;
2423
2424                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2425         }
2426
2427         return 0;
2428 }
2429
2430 void unit_status_printf(Unit *u, const char *status, const char *format, ...) {
2431         va_list ap;
2432         char *s, *e;
2433         int err;
2434         const unsigned emax = status ? 80 - (sizeof("[  OK  ]")-1) : 80;
2435
2436         assert(u);
2437         assert(format);
2438
2439         if (!UNIT_VTABLE(u)->show_status)
2440                 return;
2441
2442         if (!manager_get_show_status(u->meta.manager))
2443                 return;
2444
2445         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2446                 return;
2447
2448         va_start(ap, format);
2449         err = vasprintf(&s, format, ap);
2450         va_end(ap);
2451         if (err < 0)
2452                 return;
2453
2454         e = ellipsize(s, emax, 100);
2455         free(s);
2456         if (!e)
2457                 return;
2458
2459         if (status)
2460                 status_printf("%s%*s[%s]\n", e, emax - strlen(e), "", status);
2461         else
2462                 status_printf("%s\n", e);
2463         free(e);
2464 }
2465
2466 bool unit_need_daemon_reload(Unit *u) {
2467         assert(u);
2468
2469         if (u->meta.fragment_path) {
2470                 struct stat st;
2471
2472                 zero(st);
2473                 if (stat(u->meta.fragment_path, &st) < 0)
2474                         /* What, cannot access this anymore? */
2475                         return true;
2476
2477                 if (u->meta.fragment_mtime > 0 &&
2478                     timespec_load(&st.st_mtim) != u->meta.fragment_mtime)
2479                         return true;
2480         }
2481
2482         if (UNIT_VTABLE(u)->need_daemon_reload)
2483                 return UNIT_VTABLE(u)->need_daemon_reload(u);
2484
2485         return false;
2486 }
2487
2488 void unit_reset_failed(Unit *u) {
2489         assert(u);
2490
2491         if (UNIT_VTABLE(u)->reset_failed)
2492                 UNIT_VTABLE(u)->reset_failed(u);
2493 }
2494
2495 Unit *unit_following(Unit *u) {
2496         assert(u);
2497
2498         if (UNIT_VTABLE(u)->following)
2499                 return UNIT_VTABLE(u)->following(u);
2500
2501         return NULL;
2502 }
2503
2504 bool unit_pending_inactive(Unit *u) {
2505         assert(u);
2506
2507         /* Returns true if the unit is inactive or going down */
2508
2509         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2510                 return true;
2511
2512         if (u->meta.job && u->meta.job->type == JOB_STOP)
2513                 return true;
2514
2515         return false;
2516 }
2517
2518 bool unit_pending_active(Unit *u) {
2519         assert(u);
2520
2521         /* Returns true if the unit is active or going up */
2522
2523         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2524                 return true;
2525
2526         if (u->meta.job &&
2527             (u->meta.job->type == JOB_START ||
2528              u->meta.job->type == JOB_RELOAD_OR_START ||
2529              u->meta.job->type == JOB_RESTART))
2530                 return true;
2531
2532         return false;
2533 }
2534
2535 UnitType unit_name_to_type(const char *n) {
2536         UnitType t;
2537
2538         assert(n);
2539
2540         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2541                 if (endswith(n, unit_vtable[t]->suffix))
2542                         return t;
2543
2544         return _UNIT_TYPE_INVALID;
2545 }
2546
2547 bool unit_name_is_valid(const char *n, bool template_ok) {
2548         UnitType t;
2549
2550         t = unit_name_to_type(n);
2551         if (t < 0 || t >= _UNIT_TYPE_MAX)
2552                 return false;
2553
2554         return unit_name_is_valid_no_type(n, template_ok);
2555 }
2556
2557 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2558         assert(u);
2559         assert(w >= 0 && w < _KILL_WHO_MAX);
2560         assert(m >= 0 && m < _KILL_MODE_MAX);
2561         assert(signo > 0);
2562         assert(signo < _NSIG);
2563
2564         if (m == KILL_NONE)
2565                 return 0;
2566
2567         if (!UNIT_VTABLE(u)->kill)
2568                 return -ENOTSUP;
2569
2570         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2571 }
2572
2573 int unit_following_set(Unit *u, Set **s) {
2574         assert(u);
2575         assert(s);
2576
2577         if (UNIT_VTABLE(u)->following_set)
2578                 return UNIT_VTABLE(u)->following_set(u, s);
2579
2580         *s = NULL;
2581         return 0;
2582 }
2583
2584 UnitFileState unit_get_unit_file_state(Unit *u) {
2585         assert(u);
2586
2587         if (u->meta.unit_file_state < 0 && u->meta.fragment_path)
2588                 u->meta.unit_file_state = unit_file_get_state(
2589                                 u->meta.manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2590                                 NULL, file_name_from_path(u->meta.fragment_path));
2591
2592         return u->meta.unit_file_state;
2593 }
2594
2595 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2596         [UNIT_STUB] = "stub",
2597         [UNIT_LOADED] = "loaded",
2598         [UNIT_ERROR] = "error",
2599         [UNIT_MERGED] = "merged",
2600         [UNIT_MASKED] = "masked"
2601 };
2602
2603 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2604
2605 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2606         [UNIT_ACTIVE] = "active",
2607         [UNIT_RELOADING] = "reloading",
2608         [UNIT_INACTIVE] = "inactive",
2609         [UNIT_FAILED] = "failed",
2610         [UNIT_ACTIVATING] = "activating",
2611         [UNIT_DEACTIVATING] = "deactivating"
2612 };
2613
2614 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2615
2616 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2617         [UNIT_REQUIRES] = "Requires",
2618         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2619         [UNIT_WANTS] = "Wants",
2620         [UNIT_REQUISITE] = "Requisite",
2621         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2622         [UNIT_REQUIRED_BY] = "RequiredBy",
2623         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2624         [UNIT_BIND_TO] = "BindTo",
2625         [UNIT_WANTED_BY] = "WantedBy",
2626         [UNIT_CONFLICTS] = "Conflicts",
2627         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2628         [UNIT_BOUND_BY] = "BoundBy",
2629         [UNIT_BEFORE] = "Before",
2630         [UNIT_AFTER] = "After",
2631         [UNIT_REFERENCES] = "References",
2632         [UNIT_REFERENCED_BY] = "ReferencedBy",
2633         [UNIT_ON_FAILURE] = "OnFailure"
2634 };
2635
2636 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);