src/core/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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser 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 "systemd/sd-id128.h"
  33 #include "systemd/sd-messages.h"
  34 #include "set.h"
  35 #include "unit.h"
  36 #include "macro.h"
  37 #include "strv.h"
  38 #include "path-util.h"
  39 #include "load-fragment.h"
  40 #include "load-dropin.h"
  41 #include "log.h"
  42 #include "unit-name.h"
  43 #include "dbus-unit.h"
  44 #include "special.h"
  45 #include "cgroup-util.h"
  46 #include "missing.h"
  47 #include "cgroup-attr.h"
  48 #include "mkdir.h"
  49 #include "label.h"
  50 #include "fileio-label.h"
  51 #include "bus-errors.h"
  52
  53 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  54         [UNIT_SERVICE] = &service_vtable,
  55         [UNIT_TIMER] = &timer_vtable,
  56         [UNIT_SOCKET] = &socket_vtable,
  57         [UNIT_TARGET] = &target_vtable,
  58         [UNIT_DEVICE] = &device_vtable,
  59         [UNIT_MOUNT] = &mount_vtable,
  60         [UNIT_AUTOMOUNT] = &automount_vtable,
  61         [UNIT_SNAPSHOT] = &snapshot_vtable,
  62         [UNIT_SWAP] = &swap_vtable,
  63         [UNIT_PATH] = &path_vtable
  64 };
  65
  66 Unit *unit_new(Manager *m, size_t size) {
  67         Unit *u;
  68
  69         assert(m);
  70         assert(size >= sizeof(Unit));
  71
  72         u = malloc0(size);
  73         if (!u)
  74                 return NULL;
  75
  76         u->names = set_new(string_hash_func, string_compare_func);
  77         if (!u->names) {
  78                 free(u);
  79                 return NULL;
  80         }
  81
  82         u->manager = m;
  83         u->type = _UNIT_TYPE_INVALID;
  84         u->deserialized_job = _JOB_TYPE_INVALID;
  85         u->default_dependencies = true;
  86         u->unit_file_state = _UNIT_FILE_STATE_INVALID;
  87
  88         return u;
  89 }
  90
  91 bool unit_has_name(Unit *u, const char *name) {
  92         assert(u);
  93         assert(name);
  94
  95         return !!set_get(u->names, (char*) name);
  96 }
  97
  98 int unit_add_name(Unit *u, const char *text) {
  99         UnitType t;
 100         char *s, *i = NULL;
 101         int r;
 102
 103         assert(u);
 104         assert(text);
 105
 106         if (unit_name_is_template(text)) {
 107                 if (!u->instance)
 108                         return -EINVAL;
 109
 110                 s = unit_name_replace_instance(text, u->instance);
 111         } else
 112                 s = strdup(text);
 113
 114         if (!s)
 115                 return -ENOMEM;
 116
 117         if (!unit_name_is_valid(s, false)) {
 118                 r = -EINVAL;
 119                 goto fail;
 120         }
 121
 122         assert_se((t = unit_name_to_type(s)) >= 0);
 123
 124         if (u->type != _UNIT_TYPE_INVALID && t != u->type) {
 125                 r = -EINVAL;
 126                 goto fail;
 127         }
 128
 129         if ((r = unit_name_to_instance(s, &i)) < 0)
 130                 goto fail;
 131
 132         if (i && unit_vtable[t]->no_instances) {
 133                 r = -EINVAL;
 134                 goto fail;
 135         }
 136
 137         /* Ensure that this unit is either instanced or not instanced,
 138          * but not both. */
 139         if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i) {
 140                 r = -EINVAL;
 141                 goto fail;
 142         }
 143
 144         if (unit_vtable[t]->no_alias &&
 145             !set_isempty(u->names) &&
 146             !set_get(u->names, s)) {
 147                 r = -EEXIST;
 148                 goto fail;
 149         }
 150
 151         if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES) {
 152                 r = -E2BIG;
 153                 goto fail;
 154         }
 155
 156         if ((r = set_put(u->names, s)) < 0) {
 157                 if (r == -EEXIST)
 158                         r = 0;
 159                 goto fail;
 160         }
 161
 162         if ((r = hashmap_put(u->manager->units, s, u)) < 0) {
 163                 set_remove(u->names, s);
 164                 goto fail;
 165         }
 166
 167         if (u->type == _UNIT_TYPE_INVALID) {
 168
 169                 u->type = t;
 170                 u->id = s;
 171                 u->instance = i;
 172
 173                 LIST_PREPEND(Unit, units_by_type, u->manager->units_by_type[t], u);
 174
 175                 if (UNIT_VTABLE(u)->init)
 176                         UNIT_VTABLE(u)->init(u);
 177         } else
 178                 free(i);
 179
 180         unit_add_to_dbus_queue(u);
 181         return 0;
 182
 183 fail:
 184         free(s);
 185         free(i);
 186
 187         return r;
 188 }
 189
 190 int unit_choose_id(Unit *u, const char *name) {
 191         char *s, *t = NULL, *i;
 192         int r;
 193
 194         assert(u);
 195         assert(name);
 196
 197         if (unit_name_is_template(name)) {
 198
 199                 if (!u->instance)
 200                         return -EINVAL;
 201
 202                 if (!(t = unit_name_replace_instance(name, u->instance)))
 203                         return -ENOMEM;
 204
 205                 name = t;
 206         }
 207
 208         /* Selects one of the names of this unit as the id */
 209         s = set_get(u->names, (char*) name);
 210         free(t);
 211
 212         if (!s)
 213                 return -ENOENT;
 214
 215         if ((r = unit_name_to_instance(s, &i)) < 0)
 216                 return r;
 217
 218         u->id = s;
 219
 220         free(u->instance);
 221         u->instance = i;
 222
 223         unit_add_to_dbus_queue(u);
 224
 225         return 0;
 226 }
 227
 228 int unit_set_description(Unit *u, const char *description) {
 229         char *s;
 230
 231         assert(u);
 232
 233         if (!(s = strdup(description)))
 234                 return -ENOMEM;
 235
 236         free(u->description);
 237         u->description = s;
 238
 239         unit_add_to_dbus_queue(u);
 240         return 0;
 241 }
 242
 243 bool unit_check_gc(Unit *u) {
 244         assert(u);
 245
 246         if (u->load_state == UNIT_STUB)
 247                 return true;
 248
 249         if (UNIT_VTABLE(u)->no_gc)
 250                 return true;
 251
 252         if (u->no_gc)
 253                 return true;
 254
 255         if (u->job)
 256                 return true;
 257
 258         if (u->nop_job)
 259                 return true;
 260
 261         if (unit_active_state(u) != UNIT_INACTIVE)
 262                 return true;
 263
 264         if (u->refs)
 265                 return true;
 266
 267         if (UNIT_VTABLE(u)->check_gc)
 268                 if (UNIT_VTABLE(u)->check_gc(u))
 269                         return true;
 270
 271         return false;
 272 }
 273
 274 void unit_add_to_load_queue(Unit *u) {
 275         assert(u);
 276         assert(u->type != _UNIT_TYPE_INVALID);
 277
 278         if (u->load_state != UNIT_STUB || u->in_load_queue)
 279                 return;
 280
 281         LIST_PREPEND(Unit, load_queue, u->manager->load_queue, u);
 282         u->in_load_queue = true;
 283 }
 284
 285 void unit_add_to_cleanup_queue(Unit *u) {
 286         assert(u);
 287
 288         if (u->in_cleanup_queue)
 289                 return;
 290
 291         LIST_PREPEND(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 292         u->in_cleanup_queue = true;
 293 }
 294
 295 void unit_add_to_gc_queue(Unit *u) {
 296         assert(u);
 297
 298         if (u->in_gc_queue || u->in_cleanup_queue)
 299                 return;
 300
 301         if (unit_check_gc(u))
 302                 return;
 303
 304         LIST_PREPEND(Unit, gc_queue, u->manager->gc_queue, u);
 305         u->in_gc_queue = true;
 306
 307         u->manager->n_in_gc_queue ++;
 308
 309         if (u->manager->gc_queue_timestamp <= 0)
 310                 u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 311 }
 312
 313 void unit_add_to_dbus_queue(Unit *u) {
 314         assert(u);
 315         assert(u->type != _UNIT_TYPE_INVALID);
 316
 317         if (u->load_state == UNIT_STUB || u->in_dbus_queue)
 318                 return;
 319
 320         /* Shortcut things if nobody cares */
 321         if (!bus_has_subscriber(u->manager)) {
 322                 u->sent_dbus_new_signal = true;
 323                 return;
 324         }
 325
 326         LIST_PREPEND(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 327         u->in_dbus_queue = true;
 328 }
 329
 330 static void bidi_set_free(Unit *u, Set *s) {
 331         Iterator i;
 332         Unit *other;
 333
 334         assert(u);
 335
 336         /* Frees the set and makes sure we are dropped from the
 337          * inverse pointers */
 338
 339         SET_FOREACH(other, s, i) {
 340                 UnitDependency d;
 341
 342                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 343                         set_remove(other->dependencies[d], u);
 344
 345                 unit_add_to_gc_queue(other);
 346         }
 347
 348         set_free(s);
 349 }
 350
 351 void unit_free(Unit *u) {
 352         UnitDependency d;
 353         Iterator i;
 354         char *t;
 355
 356         assert(u);
 357
 358         bus_unit_send_removed_signal(u);
 359
 360         if (u->load_state != UNIT_STUB)
 361                 if (UNIT_VTABLE(u)->done)
 362                         UNIT_VTABLE(u)->done(u);
 363
 364         SET_FOREACH(t, u->names, i)
 365                 hashmap_remove_value(u->manager->units, t, u);
 366
 367         if (u->job) {
 368                 Job *j = u->job;
 369                 job_uninstall(j);
 370                 job_free(j);
 371         }
 372
 373         if (u->nop_job) {
 374                 Job *j = u->nop_job;
 375                 job_uninstall(j);
 376                 job_free(j);
 377         }
 378
 379         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 380                 bidi_set_free(u, u->dependencies[d]);
 381
 382         if (u->requires_mounts_for) {
 383                 LIST_REMOVE(Unit, has_requires_mounts_for, u->manager->has_requires_mounts_for, u);
 384                 strv_free(u->requires_mounts_for);
 385         }
 386
 387         if (u->type != _UNIT_TYPE_INVALID)
 388                 LIST_REMOVE(Unit, units_by_type, u->manager->units_by_type[u->type], u);
 389
 390         if (u->in_load_queue)
 391                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 392
 393         if (u->in_dbus_queue)
 394                 LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 395
 396         if (u->in_cleanup_queue)
 397                 LIST_REMOVE(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 398
 399         if (u->in_gc_queue) {
 400                 LIST_REMOVE(Unit, gc_queue, u->manager->gc_queue, u);
 401                 u->manager->n_in_gc_queue--;
 402         }
 403
 404         cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0);
 405         cgroup_attribute_free_list(u->cgroup_attributes);
 406
 407         free(u->description);
 408         strv_free(u->documentation);
 409         free(u->fragment_path);
 410         free(u->source_path);
 411         strv_free(u->dropin_paths);
 412         free(u->instance);
 413
 414         set_free_free(u->names);
 415
 416         condition_free_list(u->conditions);
 417
 418         while (u->refs)
 419                 unit_ref_unset(u->refs);
 420
 421         free(u);
 422 }
 423
 424 UnitActiveState unit_active_state(Unit *u) {
 425         assert(u);
 426
 427         if (u->load_state == UNIT_MERGED)
 428                 return unit_active_state(unit_follow_merge(u));
 429
 430         /* After a reload it might happen that a unit is not correctly
 431          * loaded but still has a process around. That's why we won't
 432          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 433
 434         return UNIT_VTABLE(u)->active_state(u);
 435 }
 436
 437 const char* unit_sub_state_to_string(Unit *u) {
 438         assert(u);
 439
 440         return UNIT_VTABLE(u)->sub_state_to_string(u);
 441 }
 442
 443 static void complete_move(Set **s, Set **other) {
 444         assert(s);
 445         assert(other);
 446
 447         if (!*other)
 448                 return;
 449
 450         if (*s)
 451                 set_move(*s, *other);
 452         else {
 453                 *s = *other;
 454                 *other = NULL;
 455         }
 456 }
 457
 458 static void merge_names(Unit *u, Unit *other) {
 459         char *t;
 460         Iterator i;
 461
 462         assert(u);
 463         assert(other);
 464
 465         complete_move(&u->names, &other->names);
 466
 467         set_free_free(other->names);
 468         other->names = NULL;
 469         other->id = NULL;
 470
 471         SET_FOREACH(t, u->names, i)
 472                 assert_se(hashmap_replace(u->manager->units, t, u) == 0);
 473 }
 474
 475 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 476         Iterator i;
 477         Unit *back;
 478         int r;
 479
 480         assert(u);
 481         assert(other);
 482         assert(d < _UNIT_DEPENDENCY_MAX);
 483
 484         /* Fix backwards pointers */
 485         SET_FOREACH(back, other->dependencies[d], i) {
 486                 UnitDependency k;
 487
 488                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 489                         if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) {
 490
 491                                 if (r == -EEXIST)
 492                                         set_remove(back->dependencies[k], other);
 493                                 else
 494                                         assert(r == -ENOENT);
 495                         }
 496         }
 497
 498         complete_move(&u->dependencies[d], &other->dependencies[d]);
 499
 500         set_free(other->dependencies[d]);
 501         other->dependencies[d] = NULL;
 502 }
 503
 504 int unit_merge(Unit *u, Unit *other) {
 505         UnitDependency d;
 506
 507         assert(u);
 508         assert(other);
 509         assert(u->manager == other->manager);
 510         assert(u->type != _UNIT_TYPE_INVALID);
 511
 512         other = unit_follow_merge(other);
 513
 514         if (other == u)
 515                 return 0;
 516
 517         if (u->type != other->type)
 518                 return -EINVAL;
 519
 520         if (!u->instance != !other->instance)
 521                 return -EINVAL;
 522
 523         if (other->load_state != UNIT_STUB &&
 524             other->load_state != UNIT_ERROR)
 525                 return -EEXIST;
 526
 527         if (other->job)
 528                 return -EEXIST;
 529
 530         if (other->nop_job)
 531                 return -EEXIST;
 532
 533         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 534                 return -EEXIST;
 535
 536         /* Merge names */
 537         merge_names(u, other);
 538
 539         /* Redirect all references */
 540         while (other->refs)
 541                 unit_ref_set(other->refs, u);
 542
 543         /* Merge dependencies */
 544         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 545                 merge_dependencies(u, other, d);
 546
 547         other->load_state = UNIT_MERGED;
 548         other->merged_into = u;
 549
 550         /* If there is still some data attached to the other node, we
 551          * don't need it anymore, and can free it. */
 552         if (other->load_state != UNIT_STUB)
 553                 if (UNIT_VTABLE(other)->done)
 554                         UNIT_VTABLE(other)->done(other);
 555
 556         unit_add_to_dbus_queue(u);
 557         unit_add_to_cleanup_queue(other);
 558
 559         return 0;
 560 }
 561
 562 int unit_merge_by_name(Unit *u, const char *name) {
 563         Unit *other;
 564         int r;
 565         char *s = NULL;
 566
 567         assert(u);
 568         assert(name);
 569
 570         if (unit_name_is_template(name)) {
 571                 if (!u->instance)
 572                         return -EINVAL;
 573
 574                 if (!(s = unit_name_replace_instance(name, u->instance)))
 575                         return -ENOMEM;
 576
 577                 name = s;
 578         }
 579
 580         if (!(other = manager_get_unit(u->manager, name)))
 581                 r = unit_add_name(u, name);
 582         else
 583                 r = unit_merge(u, other);
 584
 585         free(s);
 586         return r;
 587 }
 588
 589 Unit* unit_follow_merge(Unit *u) {
 590         assert(u);
 591
 592         while (u->load_state == UNIT_MERGED)
 593                 assert_se(u = u->merged_into);
 594
 595         return u;
 596 }
 597
 598 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 599         int r;
 600
 601         assert(u);
 602         assert(c);
 603
 604         if (c->std_output != EXEC_OUTPUT_KMSG &&
 605             c->std_output != EXEC_OUTPUT_SYSLOG &&
 606             c->std_output != EXEC_OUTPUT_JOURNAL &&
 607             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 608             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 609             c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 610             c->std_error != EXEC_OUTPUT_KMSG &&
 611             c->std_error != EXEC_OUTPUT_SYSLOG &&
 612             c->std_error != EXEC_OUTPUT_JOURNAL &&
 613             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 614             c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 615             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 616                 return 0;
 617
 618         /* If syslog or kernel logging is requested, make sure our own
 619          * logging daemon is run first. */
 620
 621         if (u->manager->running_as == SYSTEMD_SYSTEM) {
 622                 r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true);
 623                 if (r < 0)
 624                         return r;
 625         }
 626
 627         return 0;
 628 }
 629
 630 const char *unit_description(Unit *u) {
 631         assert(u);
 632
 633         if (u->description)
 634                 return u->description;
 635
 636         return strna(u->id);
 637 }
 638
 639 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 640         char *t, **j;
 641         UnitDependency d;
 642         Iterator i;
 643         char *p2;
 644         const char *prefix2;
 645         char
 646                 timestamp1[FORMAT_TIMESTAMP_MAX],
 647                 timestamp2[FORMAT_TIMESTAMP_MAX],
 648                 timestamp3[FORMAT_TIMESTAMP_MAX],
 649                 timestamp4[FORMAT_TIMESTAMP_MAX],
 650                 timespan[FORMAT_TIMESPAN_MAX];
 651         Unit *following;
 652
 653         assert(u);
 654         assert(u->type >= 0);
 655
 656         if (!prefix)
 657                 prefix = "";
 658         p2 = strappend(prefix, "\t");
 659         prefix2 = p2 ? p2 : prefix;
 660
 661         fprintf(f,
 662                 "%s-> Unit %s:\n"
 663                 "%s\tDescription: %s\n"
 664                 "%s\tInstance: %s\n"
 665                 "%s\tUnit Load State: %s\n"
 666                 "%s\tUnit Active State: %s\n"
 667                 "%s\tInactive Exit Timestamp: %s\n"
 668                 "%s\tActive Enter Timestamp: %s\n"
 669                 "%s\tActive Exit Timestamp: %s\n"
 670                 "%s\tInactive Enter Timestamp: %s\n"
 671                 "%s\tGC Check Good: %s\n"
 672                 "%s\tNeed Daemon Reload: %s\n",
 673                 prefix, u->id,
 674                 prefix, unit_description(u),
 675                 prefix, strna(u->instance),
 676                 prefix, unit_load_state_to_string(u->load_state),
 677                 prefix, unit_active_state_to_string(unit_active_state(u)),
 678                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
 679                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
 680                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
 681                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
 682                 prefix, yes_no(unit_check_gc(u)),
 683                 prefix, yes_no(unit_need_daemon_reload(u)));
 684
 685         SET_FOREACH(t, u->names, i)
 686                 fprintf(f, "%s\tName: %s\n", prefix, t);
 687
 688         STRV_FOREACH(j, u->documentation)
 689                 fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);
 690
 691         if ((following = unit_following(u)))
 692                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);
 693
 694         if (u->fragment_path)
 695                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);
 696
 697         if (u->source_path)
 698                 fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);
 699
 700         STRV_FOREACH(j, u->dropin_paths)
 701                 fprintf(f, "%s\tDropIn Path: %s\n", prefix, *j);
 702
 703         if (u->job_timeout > 0)
 704                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout, 0));
 705
 706         condition_dump_list(u->conditions, f, prefix);
 707
 708         if (dual_timestamp_is_set(&u->condition_timestamp))
 709                 fprintf(f,
 710                         "%s\tCondition Timestamp: %s\n"
 711                         "%s\tCondition Result: %s\n",
 712                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
 713                         prefix, yes_no(u->condition_result));
 714
 715         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 716                 Unit *other;
 717
 718                 SET_FOREACH(other, u->dependencies[d], i)
 719                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
 720         }
 721
 722         if (!strv_isempty(u->requires_mounts_for)) {
 723                 fprintf(f,
 724                         "%s\tRequiresMountsFor:", prefix);
 725
 726                 STRV_FOREACH(j, u->requires_mounts_for)
 727                         fprintf(f, " %s", *j);
 728
 729                 fputs("\n", f);
 730         }
 731
 732         if (u->load_state == UNIT_LOADED) {
 733                 CGroupBonding *b;
 734                 CGroupAttribute *a;
 735
 736                 fprintf(f,
 737                         "%s\tStopWhenUnneeded: %s\n"
 738                         "%s\tRefuseManualStart: %s\n"
 739                         "%s\tRefuseManualStop: %s\n"
 740                         "%s\tDefaultDependencies: %s\n"
 741                         "%s\tOnFailureIsolate: %s\n"
 742                         "%s\tIgnoreOnIsolate: %s\n"
 743                         "%s\tIgnoreOnSnapshot: %s\n",
 744                         prefix, yes_no(u->stop_when_unneeded),
 745                         prefix, yes_no(u->refuse_manual_start),
 746                         prefix, yes_no(u->refuse_manual_stop),
 747                         prefix, yes_no(u->default_dependencies),
 748                         prefix, yes_no(u->on_failure_isolate),
 749                         prefix, yes_no(u->ignore_on_isolate),
 750                         prefix, yes_no(u->ignore_on_snapshot));
 751
 752                 LIST_FOREACH(by_unit, b, u->cgroup_bondings)
 753                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 754                                 prefix, b->controller, b->path);
 755
 756                 LIST_FOREACH(by_unit, a, u->cgroup_attributes) {
 757                         _cleanup_free_ char *v = NULL;
 758
 759                         if (a->semantics && a->semantics->map_write)
 760                                 a->semantics->map_write(a->semantics, a->value, &v);
 761
 762                         fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
 763                                 prefix, a->controller, a->name, v ? v : a->value);
 764                 }
 765
 766                 if (UNIT_VTABLE(u)->dump)
 767                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 768
 769         } else if (u->load_state == UNIT_MERGED)
 770                 fprintf(f,
 771                         "%s\tMerged into: %s\n",
 772                         prefix, u->merged_into->id);
 773         else if (u->load_state == UNIT_ERROR)
 774                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
 775
 776
 777         if (u->job)
 778                 job_dump(u->job, f, prefix2);
 779
 780         if (u->nop_job)
 781                 job_dump(u->nop_job, f, prefix2);
 782
 783         free(p2);
 784 }
 785
 786 /* Common implementation for multiple backends */
 787 int unit_load_fragment_and_dropin(Unit *u) {
 788         int r;
 789
 790         assert(u);
 791
 792         /* Load a .service file */
 793         if ((r = unit_load_fragment(u)) < 0)
 794                 return r;
 795
 796         if (u->load_state == UNIT_STUB)
 797                 return -ENOENT;
 798
 799         /* Load drop-in directory data */
 800         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 801                 return r;
 802
 803         return 0;
 804 }
 805
 806 /* Common implementation for multiple backends */
 807 int unit_load_fragment_and_dropin_optional(Unit *u) {
 808         int r;
 809
 810         assert(u);
 811
 812         /* Same as unit_load_fragment_and_dropin(), but whether
 813          * something can be loaded or not doesn't matter. */
 814
 815         /* Load a .service file */
 816         if ((r = unit_load_fragment(u)) < 0)
 817                 return r;
 818
 819         if (u->load_state == UNIT_STUB)
 820                 u->load_state = UNIT_LOADED;
 821
 822         /* Load drop-in directory data */
 823         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 824                 return r;
 825
 826         return 0;
 827 }
 828
 829 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 830         assert(u);
 831         assert(target);
 832
 833         if (target->type != UNIT_TARGET)
 834                 return 0;
 835
 836         /* Only add the dependency if both units are loaded, so that
 837          * that loop check below is reliable */
 838         if (u->load_state != UNIT_LOADED ||
 839             target->load_state != UNIT_LOADED)
 840                 return 0;
 841
 842         /* If either side wants no automatic dependencies, then let's
 843          * skip this */
 844         if (!u->default_dependencies ||
 845             !target->default_dependencies)
 846                 return 0;
 847
 848         /* Don't create loops */
 849         if (set_get(target->dependencies[UNIT_BEFORE], u))
 850                 return 0;
 851
 852         return unit_add_dependency(target, UNIT_AFTER, u, true);
 853 }
 854
 855 static int unit_add_default_dependencies(Unit *u) {
 856         static const UnitDependency deps[] = {
 857                 UNIT_REQUIRED_BY,
 858                 UNIT_REQUIRED_BY_OVERRIDABLE,
 859                 UNIT_WANTED_BY,
 860                 UNIT_BOUND_BY
 861         };
 862
 863         Unit *target;
 864         Iterator i;
 865         int r;
 866         unsigned k;
 867
 868         assert(u);
 869
 870         for (k = 0; k < ELEMENTSOF(deps); k++)
 871                 SET_FOREACH(target, u->dependencies[deps[k]], i)
 872                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 873                                 return r;
 874
 875         return 0;
 876 }
 877
 878 int unit_load(Unit *u) {
 879         int r;
 880
 881         assert(u);
 882
 883         if (u->in_load_queue) {
 884                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 885                 u->in_load_queue = false;
 886         }
 887
 888         if (u->type == _UNIT_TYPE_INVALID)
 889                 return -EINVAL;
 890
 891         if (u->load_state != UNIT_STUB)
 892                 return 0;
 893
 894         if (UNIT_VTABLE(u)->load)
 895                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 896                         goto fail;
 897
 898         if (u->load_state == UNIT_STUB) {
 899                 r = -ENOENT;
 900                 goto fail;
 901         }
 902
 903         if (u->load_state == UNIT_LOADED &&
 904             u->default_dependencies)
 905                 if ((r = unit_add_default_dependencies(u)) < 0)
 906                         goto fail;
 907
 908         if (u->load_state == UNIT_LOADED) {
 909                 r = unit_add_mount_links(u);
 910                 if (r < 0)
 911                         return r;
 912         }
 913
 914         if (u->on_failure_isolate &&
 915             set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {
 916
 917                 log_error_unit(u->id,
 918                                "More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.", u->id);
 919
 920                 r = -EINVAL;
 921                 goto fail;
 922         }
 923
 924         assert((u->load_state != UNIT_MERGED) == !u->merged_into);
 925
 926         unit_add_to_dbus_queue(unit_follow_merge(u));
 927         unit_add_to_gc_queue(u);
 928
 929         return 0;
 930
 931 fail:
 932         u->load_state = UNIT_ERROR;
 933         u->load_error = r;
 934         unit_add_to_dbus_queue(u);
 935         unit_add_to_gc_queue(u);
 936
 937         log_debug_unit(u->id, "Failed to load configuration for %s: %s",
 938                        u->id, strerror(-r));
 939
 940         return r;
 941 }
 942
 943 bool unit_condition_test(Unit *u) {
 944         assert(u);
 945
 946         dual_timestamp_get(&u->condition_timestamp);
 947         u->condition_result = condition_test_list(u->conditions);
 948
 949         return u->condition_result;
 950 }
 951
 952 static const char* unit_get_status_message_format(Unit *u, JobType t) {
 953         const UnitStatusMessageFormats *format_table;
 954
 955         assert(u);
 956         assert(t >= 0);
 957         assert(t < _JOB_TYPE_MAX);
 958
 959         if (t != JOB_START && t != JOB_STOP)
 960                 return NULL;
 961
 962         format_table = &UNIT_VTABLE(u)->status_message_formats;
 963         if (!format_table)
 964                 return NULL;
 965
 966         return format_table->starting_stopping[t == JOB_STOP];
 967 }
 968
 969 static const char *unit_get_status_message_format_try_harder(Unit *u, JobType t) {
 970         const char *format;
 971
 972         assert(u);
 973         assert(t >= 0);
 974         assert(t < _JOB_TYPE_MAX);
 975
 976         format = unit_get_status_message_format(u, t);
 977         if (format)
 978                 return format;
 979
 980         /* Return generic strings */
 981         if (t == JOB_START)
 982                 return "Starting %s.";
 983         else if (t == JOB_STOP)
 984                 return "Stopping %s.";
 985         else if (t == JOB_RELOAD)
 986                 return "Reloading %s.";
 987
 988         return NULL;
 989 }
 990
 991 static void unit_status_print_starting_stopping(Unit *u, JobType t) {
 992         const char *format;
 993
 994         assert(u);
 995
 996         /* We only print status messages for selected units on
 997          * selected operations. */
 998
 999         format = unit_get_status_message_format(u, t);
1000         if (!format)
1001                 return;
1002
1003         unit_status_printf(u, "", format);
1004 }
1005
1006 #pragma GCC diagnostic push
1007 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
1008 static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
1009         const char *format;
1010         char buf[LINE_MAX];
1011         sd_id128_t mid;
1012
1013         assert(u);
1014
1015         if (t != JOB_START && t != JOB_STOP && t != JOB_RELOAD)
1016                 return;
1017
1018         if (log_on_console())
1019                 return;
1020
1021         /* We log status messages for all units and all operations. */
1022
1023         format = unit_get_status_message_format_try_harder(u, t);
1024         if (!format)
1025                 return;
1026
1027         snprintf(buf, sizeof(buf), format, unit_description(u));
1028         char_array_0(buf);
1029
1030         mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING :
1031               t == JOB_STOP  ? SD_MESSAGE_UNIT_STOPPING :
1032                                SD_MESSAGE_UNIT_RELOADING;
1033
1034         log_struct_unit(LOG_INFO,
1035                         u->id,
1036                         MESSAGE_ID(mid),
1037                         "MESSAGE=%s", buf,
1038                         NULL);
1039 }
1040 #pragma GCC diagnostic pop
1041
1042 /* Errors:
1043  *         -EBADR:     This unit type does not support starting.
1044  *         -EALREADY:  Unit is already started.
1045  *         -EAGAIN:    An operation is already in progress. Retry later.
1046  *         -ECANCELED: Too many requests for now.
1047  */
1048 int unit_start(Unit *u) {
1049         UnitActiveState state;
1050         Unit *following;
1051
1052         assert(u);
1053
1054         if (u->load_state != UNIT_LOADED)
1055                 return -EINVAL;
1056
1057         /* If this is already started, then this will succeed. Note
1058          * that this will even succeed if this unit is not startable
1059          * by the user. This is relied on to detect when we need to
1060          * wait for units and when waiting is finished. */
1061         state = unit_active_state(u);
1062         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
1063                 return -EALREADY;
1064
1065         /* If the conditions failed, don't do anything at all. If we
1066          * already are activating this call might still be useful to
1067          * speed up activation in case there is some hold-off time,
1068          * but we don't want to recheck the condition in that case. */
1069         if (state != UNIT_ACTIVATING &&
1070             !unit_condition_test(u)) {
1071                 log_debug_unit(u->id, "Starting of %s requested but condition failed. Ignoring.", u->id);
1072                 return -EALREADY;
1073         }
1074
1075         /* Forward to the main object, if we aren't it. */
1076         if ((following = unit_following(u))) {
1077                 log_debug_unit(u->id, "Redirecting start request from %s to %s.",
1078                                u->id, following->id);
1079                 return unit_start(following);
1080         }
1081
1082         unit_status_log_starting_stopping_reloading(u, JOB_START);
1083         unit_status_print_starting_stopping(u, JOB_START);
1084
1085         /* If it is stopped, but we cannot start it, then fail */
1086         if (!UNIT_VTABLE(u)->start)
1087                 return -EBADR;
1088
1089         /* We don't suppress calls to ->start() here when we are
1090          * already starting, to allow this request to be used as a
1091          * "hurry up" call, for example when the unit is in some "auto
1092          * restart" state where it waits for a holdoff timer to elapse
1093          * before it will start again. */
1094
1095         unit_add_to_dbus_queue(u);
1096
1097         return UNIT_VTABLE(u)->start(u);
1098 }
1099
1100 bool unit_can_start(Unit *u) {
1101         assert(u);
1102
1103         return !!UNIT_VTABLE(u)->start;
1104 }
1105
1106 bool unit_can_isolate(Unit *u) {
1107         assert(u);
1108
1109         return unit_can_start(u) &&
1110                 u->allow_isolate;
1111 }
1112
1113 /* Errors:
1114  *         -EBADR:    This unit type does not support stopping.
1115  *         -EALREADY: Unit is already stopped.
1116  *         -EAGAIN:   An operation is already in progress. Retry later.
1117  */
1118 int unit_stop(Unit *u) {
1119         UnitActiveState state;
1120         Unit *following;
1121
1122         assert(u);
1123
1124         state = unit_active_state(u);
1125         if (UNIT_IS_INACTIVE_OR_FAILED(state))
1126                 return -EALREADY;
1127
1128         if ((following = unit_following(u))) {
1129                 log_debug_unit(u->id, "Redirecting stop request from %s to %s.",
1130                                u->id, following->id);
1131                 return unit_stop(following);
1132         }
1133
1134         unit_status_log_starting_stopping_reloading(u, JOB_STOP);
1135         unit_status_print_starting_stopping(u, JOB_STOP);
1136
1137         if (!UNIT_VTABLE(u)->stop)
1138                 return -EBADR;
1139
1140         unit_add_to_dbus_queue(u);
1141
1142         return UNIT_VTABLE(u)->stop(u);
1143 }
1144
1145 /* Errors:
1146  *         -EBADR:    This unit type does not support reloading.
1147  *         -ENOEXEC:  Unit is not started.
1148  *         -EAGAIN:   An operation is already in progress. Retry later.
1149  */
1150 int unit_reload(Unit *u) {
1151         UnitActiveState state;
1152         Unit *following;
1153
1154         assert(u);
1155
1156         if (u->load_state != UNIT_LOADED)
1157                 return -EINVAL;
1158
1159         if (!unit_can_reload(u))
1160                 return -EBADR;
1161
1162         state = unit_active_state(u);
1163         if (state == UNIT_RELOADING)
1164                 return -EALREADY;
1165
1166         if (state != UNIT_ACTIVE)
1167                 return -ENOEXEC;
1168
1169         if ((following = unit_following(u))) {
1170                 log_debug_unit(u->id, "Redirecting reload request from %s to %s.",
1171                                u->id, following->id);
1172                 return unit_reload(following);
1173         }
1174
1175         unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
1176
1177         unit_add_to_dbus_queue(u);
1178         return UNIT_VTABLE(u)->reload(u);
1179 }
1180
1181 bool unit_can_reload(Unit *u) {
1182         assert(u);
1183
1184         if (!UNIT_VTABLE(u)->reload)
1185                 return false;
1186
1187         if (!UNIT_VTABLE(u)->can_reload)
1188                 return true;
1189
1190         return UNIT_VTABLE(u)->can_reload(u);
1191 }
1192
1193 static void unit_check_unneeded(Unit *u) {
1194         Iterator i;
1195         Unit *other;
1196
1197         assert(u);
1198
1199         /* If this service shall be shut down when unneeded then do
1200          * so. */
1201
1202         if (!u->stop_when_unneeded)
1203                 return;
1204
1205         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1206                 return;
1207
1208         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
1209                 if (unit_pending_active(other))
1210                         return;
1211
1212         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1213                 if (unit_pending_active(other))
1214                         return;
1215
1216         SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
1217                 if (unit_pending_active(other))
1218                         return;
1219
1220         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1221                 if (unit_pending_active(other))
1222                         return;
1223
1224         log_info_unit(u->id, "Service %s is not needed anymore. Stopping.", u->id);
1225
1226         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1227         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1228 }
1229
1230 static void retroactively_start_dependencies(Unit *u) {
1231         Iterator i;
1232         Unit *other;
1233
1234         assert(u);
1235         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1236
1237         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1238                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1239                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1240                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1241
1242         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1243                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1244                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1245                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1246
1247         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1248                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1249                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1250                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1251
1252         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1253                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1254                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1255                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1256
1257         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)
1258                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1259                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1260
1261         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
1262                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1263                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1264 }
1265
1266 static void retroactively_stop_dependencies(Unit *u) {
1267         Iterator i;
1268         Unit *other;
1269
1270         assert(u);
1271         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1272
1273         /* Pull down units which are bound to us recursively if enabled */
1274         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1275                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1276                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1277 }
1278
1279 static void check_unneeded_dependencies(Unit *u) {
1280         Iterator i;
1281         Unit *other;
1282
1283         assert(u);
1284         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1285
1286         /* Garbage collect services that might not be needed anymore, if enabled */
1287         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1288                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1289                         unit_check_unneeded(other);
1290         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1291                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1292                         unit_check_unneeded(other);
1293         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1294                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1295                         unit_check_unneeded(other);
1296         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1297                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1298                         unit_check_unneeded(other);
1299         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1300                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1301                         unit_check_unneeded(other);
1302         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1303                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1304                         unit_check_unneeded(other);
1305 }
1306
1307 void unit_trigger_on_failure(Unit *u) {
1308         Unit *other;
1309         Iterator i;
1310
1311         assert(u);
1312
1313         if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)
1314                 return;
1315
1316         log_info_unit(u->id, "Triggering OnFailure= dependencies of %s.", u->id);
1317
1318         SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {
1319                 int r;
1320
1321                 r = manager_add_job(u->manager, JOB_START, other, u->on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL);
1322                 if (r < 0)
1323                         log_error_unit(u->id, "Failed to enqueue OnFailure= job: %s", strerror(-r));
1324         }
1325 }
1326
1327 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1328         Manager *m;
1329         bool unexpected;
1330
1331         assert(u);
1332         assert(os < _UNIT_ACTIVE_STATE_MAX);
1333         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1334
1335         /* Note that this is called for all low-level state changes,
1336          * even if they might map to the same high-level
1337          * UnitActiveState! That means that ns == os is OK an expected
1338          * behavior here. For example: if a mount point is remounted
1339          * this function will be called too! */
1340
1341         m = u->manager;
1342
1343         if (m->n_reloading <= 0) {
1344                 dual_timestamp ts;
1345
1346                 dual_timestamp_get(&ts);
1347
1348                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1349                         u->inactive_exit_timestamp = ts;
1350                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1351                         u->inactive_enter_timestamp = ts;
1352
1353                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1354                         u->active_enter_timestamp = ts;
1355                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1356                         u->active_exit_timestamp = ts;
1357
1358                 timer_unit_notify(u, ns);
1359                 path_unit_notify(u, ns);
1360         }
1361
1362         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1363                 cgroup_bonding_trim_list(u->cgroup_bondings, true);
1364
1365         if (UNIT_IS_INACTIVE_OR_FAILED(os) != UNIT_IS_INACTIVE_OR_FAILED(ns)) {
1366                 ExecContext *ec = unit_get_exec_context(u);
1367                 if (ec && exec_context_may_touch_console(ec)) {
1368                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1369                                 m->n_on_console--;
1370                         else
1371                                 m->n_on_console++;
1372                 }
1373         }
1374
1375         if (u->job) {
1376                 unexpected = false;
1377
1378                 if (u->job->state == JOB_WAITING)
1379
1380                         /* So we reached a different state for this
1381                          * job. Let's see if we can run it now if it
1382                          * failed previously due to EAGAIN. */
1383                         job_add_to_run_queue(u->job);
1384
1385                 /* Let's check whether this state change constitutes a
1386                  * finished job, or maybe contradicts a running job and
1387                  * hence needs to invalidate jobs. */
1388
1389                 switch (u->job->type) {
1390
1391                 case JOB_START:
1392                 case JOB_VERIFY_ACTIVE:
1393
1394                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1395                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1396                         else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1397                                 unexpected = true;
1398
1399                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1400                                         job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1401                         }
1402
1403                         break;
1404
1405                 case JOB_RELOAD:
1406                 case JOB_RELOAD_OR_START:
1407
1408                         if (u->job->state == JOB_RUNNING) {
1409                                 if (ns == UNIT_ACTIVE)
1410                                         job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true);
1411                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1412                                         unexpected = true;
1413
1414                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1415                                                 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1416                                 }
1417                         }
1418
1419                         break;
1420
1421                 case JOB_STOP:
1422                 case JOB_RESTART:
1423                 case JOB_TRY_RESTART:
1424
1425                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1426                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1427                         else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1428                                 unexpected = true;
1429                                 job_finish_and_invalidate(u->job, JOB_FAILED, true);
1430                         }
1431
1432                         break;
1433
1434                 default:
1435                         assert_not_reached("Job type unknown");
1436                 }
1437
1438         } else
1439                 unexpected = true;
1440
1441         if (m->n_reloading <= 0) {
1442
1443                 /* If this state change happened without being
1444                  * requested by a job, then let's retroactively start
1445                  * or stop dependencies. We skip that step when
1446                  * deserializing, since we don't want to create any
1447                  * additional jobs just because something is already
1448                  * activated. */
1449
1450                 if (unexpected) {
1451                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1452                                 retroactively_start_dependencies(u);
1453                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1454                                 retroactively_stop_dependencies(u);
1455                 }
1456
1457                 /* stop unneeded units regardless if going down was expected or not */
1458                 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1459                         check_unneeded_dependencies(u);
1460
1461                 if (ns != os && ns == UNIT_FAILED) {
1462                         log_notice_unit(u->id,
1463                                         "MESSAGE=Unit %s entered failed state.", u->id);
1464                         unit_trigger_on_failure(u);
1465                 }
1466         }
1467
1468         /* Some names are special */
1469         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1470
1471                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1472                         /* The bus just might have become available,
1473                          * hence try to connect to it, if we aren't
1474                          * yet connected. */
1475                         bus_init(m, true);
1476
1477                 if (u->type == UNIT_SERVICE &&
1478                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1479                     m->n_reloading <= 0) {
1480                         /* Write audit record if we have just finished starting up */
1481                         manager_send_unit_audit(m, u, AUDIT_SERVICE_START, true);
1482                         u->in_audit = true;
1483                 }
1484
1485                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1486                         manager_send_unit_plymouth(m, u);
1487
1488         } else {
1489
1490                 /* We don't care about D-Bus here, since we'll get an
1491                  * asynchronous notification for it anyway. */
1492
1493                 if (u->type == UNIT_SERVICE &&
1494                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1495                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1496                     m->n_reloading <= 0) {
1497
1498                         /* Hmm, if there was no start record written
1499                          * write it now, so that we always have a nice
1500                          * pair */
1501                         if (!u->in_audit) {
1502                                 manager_send_unit_audit(m, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1503
1504                                 if (ns == UNIT_INACTIVE)
1505                                         manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, true);
1506                         } else
1507                                 /* Write audit record if we have just finished shutting down */
1508                                 manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1509
1510                         u->in_audit = false;
1511                 }
1512         }
1513
1514         manager_recheck_journal(m);
1515
1516         /* Maybe we finished startup and are now ready for being
1517          * stopped because unneeded? */
1518         if (u->manager->n_reloading <= 0)
1519                 unit_check_unneeded(u);
1520
1521         unit_add_to_dbus_queue(u);
1522         unit_add_to_gc_queue(u);
1523 }
1524
1525 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1526         struct epoll_event ev = {
1527                 .data.ptr = w,
1528                 .events = events,
1529         };
1530
1531         assert(u);
1532         assert(fd >= 0);
1533         assert(w);
1534         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1535
1536         if (epoll_ctl(u->manager->epoll_fd,
1537                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1538                       fd,
1539                       &ev) < 0)
1540                 return -errno;
1541
1542         w->fd = fd;
1543         w->type = WATCH_FD;
1544         w->data.unit = u;
1545
1546         return 0;
1547 }
1548
1549 void unit_unwatch_fd(Unit *u, Watch *w) {
1550         assert(u);
1551         assert(w);
1552
1553         if (w->type == WATCH_INVALID)
1554                 return;
1555
1556         assert(w->type == WATCH_FD);
1557         assert(w->data.unit == u);
1558         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1559
1560         w->fd = -1;
1561         w->type = WATCH_INVALID;
1562         w->data.unit = NULL;
1563 }
1564
1565 int unit_watch_pid(Unit *u, pid_t pid) {
1566         assert(u);
1567         assert(pid >= 1);
1568
1569         /* Watch a specific PID. We only support one unit watching
1570          * each PID for now. */
1571
1572         return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1573 }
1574
1575 void unit_unwatch_pid(Unit *u, pid_t pid) {
1576         assert(u);
1577         assert(pid >= 1);
1578
1579         hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1580 }
1581
1582 int unit_watch_timer(Unit *u, clockid_t clock_id, bool relative, usec_t usec, Watch *w) {
1583         struct itimerspec its = {};
1584         int flags, fd;
1585         bool ours;
1586
1587         assert(u);
1588         assert(w);
1589         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1590
1591         /* This will try to reuse the old timer if there is one */
1592
1593         if (w->type == WATCH_UNIT_TIMER) {
1594                 assert(w->data.unit == u);
1595                 assert(w->fd >= 0);
1596
1597                 ours = false;
1598                 fd = w->fd;
1599         } else if (w->type == WATCH_INVALID) {
1600
1601                 ours = true;
1602                 fd = timerfd_create(clock_id, TFD_NONBLOCK|TFD_CLOEXEC);
1603                 if (fd < 0)
1604                         return -errno;
1605         } else
1606                 assert_not_reached("Invalid watch type");
1607
1608         if (usec <= 0) {
1609                 /* Set absolute time in the past, but not 0, since we
1610                  * don't want to disarm the timer */
1611                 its.it_value.tv_sec = 0;
1612                 its.it_value.tv_nsec = 1;
1613
1614                 flags = TFD_TIMER_ABSTIME;
1615         } else {
1616                 timespec_store(&its.it_value, usec);
1617                 flags = relative ? 0 : TFD_TIMER_ABSTIME;
1618         }
1619
1620         /* This will also flush the elapse counter */
1621         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1622                 goto fail;
1623
1624         if (w->type == WATCH_INVALID) {
1625                 struct epoll_event ev = {
1626                         .data.ptr = w,
1627                         .events = EPOLLIN,
1628                 };
1629
1630                 if (epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1631                         goto fail;
1632         }
1633
1634         w->type = WATCH_UNIT_TIMER;
1635         w->fd = fd;
1636         w->data.unit = u;
1637
1638         return 0;
1639
1640 fail:
1641         if (ours)
1642                 close_nointr_nofail(fd);
1643
1644         return -errno;
1645 }
1646
1647 void unit_unwatch_timer(Unit *u, Watch *w) {
1648         assert(u);
1649         assert(w);
1650
1651         if (w->type == WATCH_INVALID)
1652                 return;
1653
1654         assert(w->type == WATCH_UNIT_TIMER);
1655         assert(w->data.unit == u);
1656         assert(w->fd >= 0);
1657
1658         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1659         close_nointr_nofail(w->fd);
1660
1661         w->fd = -1;
1662         w->type = WATCH_INVALID;
1663         w->data.unit = NULL;
1664 }
1665
1666 bool unit_job_is_applicable(Unit *u, JobType j) {
1667         assert(u);
1668         assert(j >= 0 && j < _JOB_TYPE_MAX);
1669
1670         switch (j) {
1671
1672         case JOB_VERIFY_ACTIVE:
1673         case JOB_START:
1674         case JOB_STOP:
1675         case JOB_NOP:
1676                 return true;
1677
1678         case JOB_RESTART:
1679         case JOB_TRY_RESTART:
1680                 return unit_can_start(u);
1681
1682         case JOB_RELOAD:
1683                 return unit_can_reload(u);
1684
1685         case JOB_RELOAD_OR_START:
1686                 return unit_can_reload(u) && unit_can_start(u);
1687
1688         default:
1689                 assert_not_reached("Invalid job type");
1690         }
1691 }
1692
1693 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1694
1695         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1696                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1697                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1698                 [UNIT_WANTS] = UNIT_WANTED_BY,
1699                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1700                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1701                 [UNIT_BINDS_TO] = UNIT_BOUND_BY,
1702                 [UNIT_PART_OF] = UNIT_CONSISTS_OF,
1703                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1704                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1705                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1706                 [UNIT_BOUND_BY] = UNIT_BINDS_TO,
1707                 [UNIT_CONSISTS_OF] = UNIT_PART_OF,
1708                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1709                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1710                 [UNIT_BEFORE] = UNIT_AFTER,
1711                 [UNIT_AFTER] = UNIT_BEFORE,
1712                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1713                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1714                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES,
1715                 [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,
1716                 [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,
1717                 [UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM,
1718                 [UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO,
1719         };
1720         int r, q = 0, v = 0, w = 0;
1721
1722         assert(u);
1723         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1724         assert(other);
1725
1726         u = unit_follow_merge(u);
1727         other = unit_follow_merge(other);
1728
1729         /* We won't allow dependencies on ourselves. We will not
1730          * consider them an error however. */
1731         if (u == other)
1732                 return 0;
1733
1734         if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1735                 return r;
1736
1737         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1738                 if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1739                         return r;
1740
1741         if (add_reference)
1742                 if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1743                     (r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1744                         return r;
1745
1746         if ((q = set_put(u->dependencies[d], other)) < 0)
1747                 return q;
1748
1749         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1750                 if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) {
1751                         r = v;
1752                         goto fail;
1753                 }
1754
1755         if (add_reference) {
1756                 if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) {
1757                         r = w;
1758                         goto fail;
1759                 }
1760
1761                 if ((r = set_put(other->dependencies[UNIT_REFERENCED_BY], u)) < 0)
1762                         goto fail;
1763         }
1764
1765         unit_add_to_dbus_queue(u);
1766         return 0;
1767
1768 fail:
1769         if (q > 0)
1770                 set_remove(u->dependencies[d], other);
1771
1772         if (v > 0)
1773                 set_remove(other->dependencies[inverse_table[d]], u);
1774
1775         if (w > 0)
1776                 set_remove(u->dependencies[UNIT_REFERENCES], other);
1777
1778         return r;
1779 }
1780
1781 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1782         int r;
1783
1784         assert(u);
1785
1786         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1787                 return r;
1788
1789         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1790                 return r;
1791
1792         return 0;
1793 }
1794
1795 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1796         char *s;
1797
1798         assert(u);
1799         assert(name || path);
1800         assert(p);
1801
1802         if (!name)
1803                 name = path_get_file_name(path);
1804
1805         if (!unit_name_is_template(name)) {
1806                 *p = NULL;
1807                 return name;
1808         }
1809
1810         if (u->instance)
1811                 s = unit_name_replace_instance(name, u->instance);
1812         else {
1813                 char *i;
1814
1815                 i = unit_name_to_prefix(u->id);
1816                 if (!i)
1817                         return NULL;
1818
1819                 s = unit_name_replace_instance(name, i);
1820                 free(i);
1821         }
1822
1823         if (!s)
1824                 return NULL;
1825
1826         *p = s;
1827         return s;
1828 }
1829
1830 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1831         Unit *other;
1832         int r;
1833         _cleanup_free_ char *s = NULL;
1834
1835         assert(u);
1836         assert(name || path);
1837
1838         name = resolve_template(u, name, path, &s);
1839         if (!name)
1840                 return -ENOMEM;
1841
1842         r = manager_load_unit(u->manager, name, path, NULL, &other);
1843         if (r < 0)
1844                 return r;
1845
1846         return unit_add_dependency(u, d, other, add_reference);
1847 }
1848
1849 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1850         Unit *other;
1851         int r;
1852         char *s;
1853
1854         assert(u);
1855         assert(name || path);
1856
1857         if (!(name = resolve_template(u, name, path, &s)))
1858                 return -ENOMEM;
1859
1860         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1861                 goto finish;
1862
1863         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1864
1865 finish:
1866         free(s);
1867         return r;
1868 }
1869
1870 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1871         Unit *other;
1872         int r;
1873         char *s;
1874
1875         assert(u);
1876         assert(name || path);
1877
1878         if (!(name = resolve_template(u, name, path, &s)))
1879                 return -ENOMEM;
1880
1881         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1882                 goto finish;
1883
1884         r = unit_add_dependency(other, d, u, add_reference);
1885
1886 finish:
1887         free(s);
1888         return r;
1889 }
1890
1891 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1892         Unit *other;
1893         int r;
1894         char *s;
1895
1896         assert(u);
1897         assert(name || path);
1898
1899         if (!(name = resolve_template(u, name, path, &s)))
1900                 return -ENOMEM;
1901
1902         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1903                 goto finish;
1904
1905         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1906                 goto finish;
1907
1908 finish:
1909         free(s);
1910         return r;
1911 }
1912
1913 int set_unit_path(const char *p) {
1914         _cleanup_free_ char *c = NULL;
1915
1916         /* This is mostly for debug purposes */
1917         c = path_make_absolute_cwd(p);
1918         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0)
1919                 return -errno;
1920
1921         return 0;
1922 }
1923
1924 char *unit_dbus_path(Unit *u) {
1925         assert(u);
1926
1927         if (!u->id)
1928                 return NULL;
1929
1930         return unit_dbus_path_from_name(u->id);
1931 }
1932
1933 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1934         int r;
1935
1936         assert(u);
1937         assert(b);
1938
1939         assert(b->path);
1940
1941         if (!b->controller) {
1942                 b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1943                 if (!b->controller)
1944                         return log_oom();
1945
1946                 b->ours = true;
1947         }
1948
1949         /* Ensure this hasn't been added yet */
1950         assert(!b->unit);
1951
1952         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1953                 CGroupBonding *l;
1954
1955                 l = hashmap_get(u->manager->cgroup_bondings, b->path);
1956                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1957
1958                 r = hashmap_replace(u->manager->cgroup_bondings, b->path, l);
1959                 if (r < 0) {
1960                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1961                         return r;
1962                 }
1963         }
1964
1965         LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b);
1966         b->unit = u;
1967
1968         return 0;
1969 }
1970
1971 char *unit_default_cgroup_path(Unit *u) {
1972         assert(u);
1973
1974         if (u->instance) {
1975                 _cleanup_free_ char *t = NULL;
1976
1977                 t = unit_name_template(u->id);
1978                 if (!t)
1979                         return NULL;
1980
1981                 return strjoin(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL);
1982         } else
1983                 return strjoin(u->manager->cgroup_hierarchy, "/", u->id, NULL);
1984 }
1985
1986 int unit_add_cgroup_from_text(Unit *u, const char *name, bool overwrite, CGroupBonding **ret) {
1987         char *controller = NULL, *path = NULL;
1988         CGroupBonding *b = NULL;
1989         bool ours = false;
1990         int r;
1991
1992         assert(u);
1993         assert(name);
1994
1995         r = cg_split_spec(name, &controller, &path);
1996         if (r < 0)
1997                 return r;
1998
1999         if (!path) {
2000                 path = unit_default_cgroup_path(u);
2001                 ours = true;
2002         }
2003
2004         if (!controller) {
2005                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
2006                 ours = true;
2007         }
2008
2009         if (!path || !controller) {
2010                 free(path);
2011                 free(controller);
2012                 return log_oom();
2013         }
2014
2015         b = cgroup_bonding_find_list(u->cgroup_bondings, controller);
2016         if (b) {
2017                 if (streq(path, b->path)) {
2018                         free(path);
2019                         free(controller);
2020
2021                         if (ret)
2022                                 *ret = b;
2023                         return 0;
2024                 }
2025
2026                 if (overwrite && !b->essential) {
2027                         free(controller);
2028
2029                         free(b->path);
2030                         b->path = path;
2031
2032                         b->ours = ours;
2033                         b->realized = false;
2034
2035                         if (ret)
2036                                 *ret = b;
2037
2038                         return 1;
2039                 }
2040
2041                 r = -EEXIST;
2042                 b = NULL;
2043                 goto fail;
2044         }
2045
2046         b = new0(CGroupBonding, 1);
2047         if (!b) {
2048                 r = -ENOMEM;
2049                 goto fail;
2050         }
2051
2052         b->controller = controller;
2053         b->path = path;
2054         b->ours = ours;
2055         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
2056
2057         r = unit_add_cgroup(u, b);
2058         if (r < 0)
2059                 goto fail;
2060
2061         if (ret)
2062                 *ret = b;
2063
2064         return 1;
2065
2066 fail:
2067         free(path);
2068         free(controller);
2069         free(b);
2070
2071         return r;
2072 }
2073
2074 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
2075         CGroupBonding *b = NULL;
2076         int r = -ENOMEM;
2077
2078         assert(u);
2079
2080         if (!controller)
2081                 controller = SYSTEMD_CGROUP_CONTROLLER;
2082
2083         if (cgroup_bonding_find_list(u->cgroup_bondings, controller))
2084                 return 0;
2085
2086         b = new0(CGroupBonding, 1);
2087         if (!b)
2088                 return -ENOMEM;
2089
2090         b->controller = strdup(controller);
2091         if (!b->controller)
2092                 goto fail;
2093
2094         b->path = unit_default_cgroup_path(u);
2095         if (!b->path)
2096                 goto fail;
2097
2098         b->ours = true;
2099         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
2100
2101         r = unit_add_cgroup(u, b);
2102         if (r < 0)
2103                 goto fail;
2104
2105         return 1;
2106
2107 fail:
2108         free(b->path);
2109         free(b->controller);
2110         free(b);
2111
2112         return r;
2113 }
2114
2115 int unit_add_default_cgroups(Unit *u) {
2116         CGroupAttribute *a;
2117         char **c;
2118         int r;
2119
2120         assert(u);
2121
2122         /* Adds in the default cgroups, if they weren't specified
2123          * otherwise. */
2124
2125         if (!u->manager->cgroup_hierarchy)
2126                 return 0;
2127
2128         r = unit_add_one_default_cgroup(u, NULL);
2129         if (r < 0)
2130                 return r;
2131
2132         STRV_FOREACH(c, u->manager->default_controllers)
2133                 unit_add_one_default_cgroup(u, *c);
2134
2135         LIST_FOREACH(by_unit, a, u->cgroup_attributes)
2136                 unit_add_one_default_cgroup(u, a->controller);
2137
2138         return 0;
2139 }
2140
2141 CGroupBonding* unit_get_default_cgroup(Unit *u) {
2142         assert(u);
2143
2144         return cgroup_bonding_find_list(u->cgroup_bondings, NULL);
2145 }
2146
2147 int unit_add_cgroup_attribute(
2148                 Unit *u,
2149                 const CGroupSemantics *semantics,
2150                 const char *controller,
2151                 const char *name,
2152                 const char *value,
2153                 CGroupAttribute **ret) {
2154
2155         _cleanup_free_ char *c = NULL;
2156         CGroupAttribute *a;
2157         int r;
2158
2159         assert(u);
2160         assert(value);
2161
2162         if (semantics) {
2163                 /* Semantics always take precedence */
2164                 if (semantics->name)
2165                         name = semantics->name;
2166
2167                 if (semantics->controller)
2168                         controller = semantics->controller;
2169         }
2170
2171         if (!name)
2172                 return -EINVAL;
2173
2174         if (!controller) {
2175                 r = cg_controller_from_attr(name, &c);
2176                 if (r < 0)
2177                         return -EINVAL;
2178
2179                 controller = c;
2180         }
2181
2182         if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER))
2183                 return -EINVAL;
2184
2185         if (!filename_is_safe(name))
2186                 return -EINVAL;
2187
2188         if (!filename_is_safe(controller))
2189                 return -EINVAL;
2190
2191         /* Check if this attribute already exists. Note that we will
2192          * explicitly check for the value here too, as there are
2193          * attributes which accept multiple values. */
2194         a = cgroup_attribute_find_list(u->cgroup_attributes, controller, name);
2195         if (a) {
2196                 if (streq(value, a->value)) {
2197                         /* Exactly the same value is always OK, let's ignore this */
2198                         if (ret)
2199                                 *ret = a;
2200
2201                         return 0;
2202                 }
2203
2204                 if (semantics && !semantics->multiple) {
2205                         char *v;
2206
2207                         /* If this is a single-item entry, we can
2208                          * simply patch the existing attribute */
2209
2210                         v = strdup(value);
2211                         if (!v)
2212                                 return -ENOMEM;
2213
2214                         free(a->value);
2215                         a->value = v;
2216
2217                         if (ret)
2218                                 *ret = a;
2219                         return 1;
2220                 }
2221         }
2222
2223         a = new0(CGroupAttribute, 1);
2224         if (!a)
2225                 return -ENOMEM;
2226
2227         if (c) {
2228                 a->controller = c;
2229                 c = NULL;
2230         } else
2231                 a->controller = strdup(controller);
2232
2233         a->name = strdup(name);
2234         a->value = strdup(value);
2235
2236         if (!a->controller || !a->name || !a->value) {
2237                 free(a->controller);
2238                 free(a->name);
2239                 free(a->value);
2240                 free(a);
2241                 return -ENOMEM;
2242         }
2243
2244         a->semantics = semantics;
2245         a->unit = u;
2246
2247         LIST_PREPEND(CGroupAttribute, by_unit, u->cgroup_attributes, a);
2248
2249         if (ret)
2250                 *ret = a;
2251
2252         return 1;
2253 }
2254
2255 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2256         char *t;
2257         int r;
2258
2259         assert(u);
2260         assert(type);
2261         assert(_found);
2262
2263         if (!(t = unit_name_change_suffix(u->id, type)))
2264                 return -ENOMEM;
2265
2266         assert(!unit_has_name(u, t));
2267
2268         r = manager_load_unit(u->manager, t, NULL, NULL, _found);
2269         free(t);
2270
2271         assert(r < 0 || *_found != u);
2272
2273         return r;
2274 }
2275
2276 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2277         Unit *found;
2278         char *t;
2279
2280         assert(u);
2281         assert(type);
2282         assert(_found);
2283
2284         if (!(t = unit_name_change_suffix(u->id, type)))
2285                 return -ENOMEM;
2286
2287         assert(!unit_has_name(u, t));
2288
2289         found = manager_get_unit(u->manager, t);
2290         free(t);
2291
2292         if (!found)
2293                 return -ENOENT;
2294
2295         *_found = found;
2296         return 0;
2297 }
2298
2299 int unit_watch_bus_name(Unit *u, const char *name) {
2300         assert(u);
2301         assert(name);
2302
2303         /* Watch a specific name on the bus. We only support one unit
2304          * watching each name for now. */
2305
2306         return hashmap_put(u->manager->watch_bus, name, u);
2307 }
2308
2309 void unit_unwatch_bus_name(Unit *u, const char *name) {
2310         assert(u);
2311         assert(name);
2312
2313         hashmap_remove_value(u->manager->watch_bus, name, u);
2314 }
2315
2316 bool unit_can_serialize(Unit *u) {
2317         assert(u);
2318
2319         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2320 }
2321
2322 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) {
2323         int r;
2324
2325         assert(u);
2326         assert(f);
2327         assert(fds);
2328
2329         if (!unit_can_serialize(u))
2330                 return 0;
2331
2332         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2333                 return r;
2334
2335
2336         if (serialize_jobs) {
2337                 if (u->job) {
2338                         fprintf(f, "job\n");
2339                         job_serialize(u->job, f, fds);
2340                 }
2341
2342                 if (u->nop_job) {
2343                         fprintf(f, "job\n");
2344                         job_serialize(u->nop_job, f, fds);
2345                 }
2346         }
2347
2348         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);
2349         dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);
2350         dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);
2351         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);
2352         dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);
2353
2354         if (dual_timestamp_is_set(&u->condition_timestamp))
2355                 unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));
2356
2357         /* End marker */
2358         fputc('\n', f);
2359         return 0;
2360 }
2361
2362 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2363         va_list ap;
2364
2365         assert(u);
2366         assert(f);
2367         assert(key);
2368         assert(format);
2369
2370         fputs(key, f);
2371         fputc('=', f);
2372
2373         va_start(ap, format);
2374         vfprintf(f, format, ap);
2375         va_end(ap);
2376
2377         fputc('\n', f);
2378 }
2379
2380 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2381         assert(u);
2382         assert(f);
2383         assert(key);
2384         assert(value);
2385
2386         fprintf(f, "%s=%s\n", key, value);
2387 }
2388
2389 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2390         int r;
2391
2392         assert(u);
2393         assert(f);
2394         assert(fds);
2395
2396         if (!unit_can_serialize(u))
2397                 return 0;
2398
2399         for (;;) {
2400                 char line[LINE_MAX], *l, *v;
2401                 size_t k;
2402
2403                 if (!fgets(line, sizeof(line), f)) {
2404                         if (feof(f))
2405                                 return 0;
2406                         return -errno;
2407                 }
2408
2409                 char_array_0(line);
2410                 l = strstrip(line);
2411
2412                 /* End marker */
2413                 if (l[0] == 0)
2414                         return 0;
2415
2416                 k = strcspn(l, "=");
2417
2418                 if (l[k] == '=') {
2419                         l[k] = 0;
2420                         v = l+k+1;
2421                 } else
2422                         v = l+k;
2423
2424                 if (streq(l, "job")) {
2425                         if (v[0] == '\0') {
2426                                 /* new-style serialized job */
2427                                 Job *j = job_new_raw(u);
2428                                 if (!j)
2429                                         return -ENOMEM;
2430
2431                                 r = job_deserialize(j, f, fds);
2432                                 if (r < 0) {
2433                                         job_free(j);
2434                                         return r;
2435                                 }
2436
2437                                 r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j);
2438                                 if (r < 0) {
2439                                         job_free(j);
2440                                         return r;
2441                                 }
2442
2443                                 r = job_install_deserialized(j);
2444                                 if (r < 0) {
2445                                         hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id));
2446                                         job_free(j);
2447                                         return r;
2448                                 }
2449
2450                                 if (j->state == JOB_RUNNING)
2451                                         u->manager->n_running_jobs++;
2452                         } else {
2453                                 /* legacy */
2454                                 JobType type = job_type_from_string(v);
2455                                 if (type < 0)
2456                                         log_debug("Failed to parse job type value %s", v);
2457                                 else
2458                                         u->deserialized_job = type;
2459                         }
2460                         continue;
2461                 } else if (streq(l, "inactive-exit-timestamp")) {
2462                         dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);
2463                         continue;
2464                 } else if (streq(l, "active-enter-timestamp")) {
2465                         dual_timestamp_deserialize(v, &u->active_enter_timestamp);
2466                         continue;
2467                 } else if (streq(l, "active-exit-timestamp")) {
2468                         dual_timestamp_deserialize(v, &u->active_exit_timestamp);
2469                         continue;
2470                 } else if (streq(l, "inactive-enter-timestamp")) {
2471                         dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);
2472                         continue;
2473                 } else if (streq(l, "condition-timestamp")) {
2474                         dual_timestamp_deserialize(v, &u->condition_timestamp);
2475                         continue;
2476                 } else if (streq(l, "condition-result")) {
2477                         int b;
2478
2479                         if ((b = parse_boolean(v)) < 0)
2480                                 log_debug("Failed to parse condition result value %s", v);
2481                         else
2482                                 u->condition_result = b;
2483
2484                         continue;
2485                 }
2486
2487                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2488                         return r;
2489         }
2490 }
2491
2492 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2493         Unit *device;
2494         char *e;
2495         int r;
2496
2497         assert(u);
2498
2499         if (!what)
2500                 return 0;
2501
2502         /* Adds in links to the device node that this unit is based on */
2503
2504         if (!is_device_path(what))
2505                 return 0;
2506
2507         e = unit_name_from_path(what, ".device");
2508         if (!e)
2509                 return -ENOMEM;
2510
2511         r = manager_load_unit(u->manager, e, NULL, NULL, &device);
2512         free(e);
2513         if (r < 0)
2514                 return r;
2515
2516         r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true);
2517         if (r < 0)
2518                 return r;
2519
2520         if (wants) {
2521                 r = unit_add_dependency(device, UNIT_WANTS, u, false);
2522                 if (r < 0)
2523                         return r;
2524         }
2525
2526         return 0;
2527 }
2528
2529 int unit_coldplug(Unit *u) {
2530         int r;
2531
2532         assert(u);
2533
2534         if (UNIT_VTABLE(u)->coldplug)
2535                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2536                         return r;
2537
2538         if (u->job) {
2539                 r = job_coldplug(u->job);
2540                 if (r < 0)
2541                         return r;
2542         } else if (u->deserialized_job >= 0) {
2543                 /* legacy */
2544                 r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL);
2545                 if (r < 0)
2546                         return r;
2547
2548                 u->deserialized_job = _JOB_TYPE_INVALID;
2549         }
2550
2551         return 0;
2552 }
2553
2554 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) {
2555         manager_status_printf(u->manager, false, status, unit_status_msg_format, unit_description(u));
2556 }
2557
2558 bool unit_need_daemon_reload(Unit *u) {
2559         _cleanup_strv_free_ char **t = NULL;
2560         char **path;
2561         struct stat st;
2562         unsigned loaded_cnt, current_cnt;
2563
2564         assert(u);
2565
2566         if (u->fragment_path) {
2567                 zero(st);
2568                 if (stat(u->fragment_path, &st) < 0)
2569                         /* What, cannot access this anymore? */
2570                         return true;
2571
2572                 if (u->fragment_mtime > 0 &&
2573                     timespec_load(&st.st_mtim) != u->fragment_mtime)
2574                         return true;
2575         }
2576
2577         if (u->source_path) {
2578                 zero(st);
2579                 if (stat(u->source_path, &st) < 0)
2580                         return true;
2581
2582                 if (u->source_mtime > 0 &&
2583                     timespec_load(&st.st_mtim) != u->source_mtime)
2584                         return true;
2585         }
2586
2587         t = unit_find_dropin_paths(u);
2588         loaded_cnt = strv_length(t);
2589         current_cnt = strv_length(u->dropin_paths);
2590
2591         if (loaded_cnt == current_cnt) {
2592                 if (loaded_cnt == 0)
2593                         return false;
2594
2595                 if (strv_overlap(u->dropin_paths, t)) {
2596                         STRV_FOREACH(path, u->dropin_paths) {
2597                                 zero(st);
2598                                 if (stat(*path, &st) < 0)
2599                                         return true;
2600
2601                                 if (u->dropin_mtime > 0 &&
2602                                     timespec_load(&st.st_mtim) > u->dropin_mtime)
2603                                         return true;
2604                         }
2605
2606                         return false;
2607                 } else
2608                         return true;
2609         } else
2610                 return true;
2611 }
2612
2613 void unit_reset_failed(Unit *u) {
2614         assert(u);
2615
2616         if (UNIT_VTABLE(u)->reset_failed)
2617                 UNIT_VTABLE(u)->reset_failed(u);
2618 }
2619
2620 Unit *unit_following(Unit *u) {
2621         assert(u);
2622
2623         if (UNIT_VTABLE(u)->following)
2624                 return UNIT_VTABLE(u)->following(u);
2625
2626         return NULL;
2627 }
2628
2629 bool unit_pending_inactive(Unit *u) {
2630         assert(u);
2631
2632         /* Returns true if the unit is inactive or going down */
2633
2634         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2635                 return true;
2636
2637         if (u->job && u->job->type == JOB_STOP)
2638                 return true;
2639
2640         return false;
2641 }
2642
2643 bool unit_pending_active(Unit *u) {
2644         assert(u);
2645
2646         /* Returns true if the unit is active or going up */
2647
2648         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2649                 return true;
2650
2651         if (u->job &&
2652             (u->job->type == JOB_START ||
2653              u->job->type == JOB_RELOAD_OR_START ||
2654              u->job->type == JOB_RESTART))
2655                 return true;
2656
2657         return false;
2658 }
2659
2660 int unit_kill(Unit *u, KillWho w, int signo, DBusError *error) {
2661         assert(u);
2662         assert(w >= 0 && w < _KILL_WHO_MAX);
2663         assert(signo > 0);
2664         assert(signo < _NSIG);
2665
2666         if (!UNIT_VTABLE(u)->kill)
2667                 return -ENOTSUP;
2668
2669         return UNIT_VTABLE(u)->kill(u, w, signo, error);
2670 }
2671
2672 int unit_kill_common(
2673                 Unit *u,
2674                 KillWho who,
2675                 int signo,
2676                 pid_t main_pid,
2677                 pid_t control_pid,
2678                 DBusError *error) {
2679
2680         int r = 0;
2681
2682         if (who == KILL_MAIN && main_pid <= 0) {
2683                 if (main_pid < 0)
2684                         dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no main processes", unit_type_to_string(u->type));
2685                 else
2686                         dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No main process to kill");
2687                 return -ESRCH;
2688         }
2689
2690         if (who == KILL_CONTROL && control_pid <= 0) {
2691                 if (control_pid < 0)
2692                         dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no control processes", unit_type_to_string(u->type));
2693                 else
2694                         dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
2695                 return -ESRCH;
2696         }
2697
2698         if (who == KILL_CONTROL || who == KILL_ALL)
2699                 if (control_pid > 0)
2700                         if (kill(control_pid, signo) < 0)
2701                                 r = -errno;
2702
2703         if (who == KILL_MAIN || who == KILL_ALL)
2704                 if (main_pid > 0)
2705                         if (kill(main_pid, signo) < 0)
2706                                 r = -errno;
2707
2708         if (who == KILL_ALL) {
2709                 _cleanup_set_free_ Set *pid_set = NULL;
2710                 int q;
2711
2712                 pid_set = set_new(trivial_hash_func, trivial_compare_func);
2713                 if (!pid_set)
2714                         return -ENOMEM;
2715
2716                 /* Exclude the control/main pid from being killed via the cgroup */
2717                 if (control_pid > 0) {
2718                         q = set_put(pid_set, LONG_TO_PTR(control_pid));
2719                         if (q < 0)
2720                                 return q;
2721                 }
2722
2723                 if (main_pid > 0) {
2724                         q = set_put(pid_set, LONG_TO_PTR(main_pid));
2725                         if (q < 0)
2726                                 return q;
2727                 }
2728
2729                 q = cgroup_bonding_kill_list(u->cgroup_bondings, signo, false, false, pid_set, NULL);
2730                 if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT)
2731                         r = q;
2732         }
2733
2734         return r;
2735 }
2736
2737 int unit_following_set(Unit *u, Set **s) {
2738         assert(u);
2739         assert(s);
2740
2741         if (UNIT_VTABLE(u)->following_set)
2742                 return UNIT_VTABLE(u)->following_set(u, s);
2743
2744         *s = NULL;
2745         return 0;
2746 }
2747
2748 UnitFileState unit_get_unit_file_state(Unit *u) {
2749         assert(u);
2750
2751         if (u->unit_file_state < 0 && u->fragment_path)
2752                 u->unit_file_state = unit_file_get_state(
2753                                 u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2754                                 NULL, path_get_file_name(u->fragment_path));
2755
2756         return u->unit_file_state;
2757 }
2758
2759 Unit* unit_ref_set(UnitRef *ref, Unit *u) {
2760         assert(ref);
2761         assert(u);
2762
2763         if (ref->unit)
2764                 unit_ref_unset(ref);
2765
2766         ref->unit = u;
2767         LIST_PREPEND(UnitRef, refs, u->refs, ref);
2768         return u;
2769 }
2770
2771 void unit_ref_unset(UnitRef *ref) {
2772         assert(ref);
2773
2774         if (!ref->unit)
2775                 return;
2776
2777         LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref);
2778         ref->unit = NULL;
2779 }
2780
2781 int unit_add_one_mount_link(Unit *u, Mount *m) {
2782         char **i;
2783
2784         assert(u);
2785         assert(m);
2786
2787         if (u->load_state != UNIT_LOADED ||
2788             UNIT(m)->load_state != UNIT_LOADED)
2789                 return 0;
2790
2791         STRV_FOREACH(i, u->requires_mounts_for) {
2792
2793                 if (UNIT(m) == u)
2794                         continue;
2795
2796                 if (!path_startswith(*i, m->where))
2797                         continue;
2798
2799                 return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
2800         }
2801
2802         return 0;
2803 }
2804
2805 int unit_add_mount_links(Unit *u) {
2806         Unit *other;
2807         int r;
2808
2809         assert(u);
2810
2811         LIST_FOREACH(units_by_type, other, u->manager->units_by_type[UNIT_MOUNT]) {
2812                 r = unit_add_one_mount_link(u, MOUNT(other));
2813                 if (r < 0)
2814                         return r;
2815         }
2816
2817         return 0;
2818 }
2819
2820 int unit_exec_context_defaults(Unit *u, ExecContext *c) {
2821         unsigned i;
2822         int r;
2823
2824         assert(u);
2825         assert(c);
2826
2827         /* This only copies in the ones that need memory */
2828
2829         for (i = 0; i < RLIMIT_NLIMITS; i++)
2830                 if (u->manager->rlimit[i] && !c->rlimit[i]) {
2831                         c->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1);
2832                         if (!c->rlimit[i])
2833                                 return -ENOMEM;
2834                 }
2835
2836         if (u->manager->running_as == SYSTEMD_USER &&
2837             !c->working_directory) {
2838
2839                 r = get_home_dir(&c->working_directory);
2840                 if (r < 0)
2841                         return r;
2842         }
2843
2844         return 0;
2845 }
2846
2847 ExecContext *unit_get_exec_context(Unit *u) {
2848         size_t offset;
2849         assert(u);
2850
2851         offset = UNIT_VTABLE(u)->exec_context_offset;
2852         if (offset <= 0)
2853                 return NULL;
2854
2855         return (ExecContext*) ((uint8_t*) u + offset);
2856 }
2857
2858 static int drop_in_file(Unit *u, bool runtime, const char *name, char **_p, char **_q) {
2859         char *p, *q;
2860         int r;
2861
2862         assert(u);
2863         assert(name);
2864         assert(_p);
2865         assert(_q);
2866
2867         if (u->manager->running_as == SYSTEMD_USER && runtime)
2868                 return -ENOTSUP;
2869
2870         if (!filename_is_safe(name))
2871                 return -EINVAL;
2872
2873         if (u->manager->running_as == SYSTEMD_USER) {
2874                 _cleanup_free_ char *c = NULL;
2875
2876                 r = user_config_home(&c);
2877                 if (r < 0)
2878                         return r;
2879                 if (r == 0)
2880                         return -ENOENT;
2881
2882                 p = strjoin(c, "/", u->id, ".d", NULL);
2883         } else  if (runtime)
2884                 p = strjoin("/run/systemd/system/", u->id, ".d", NULL);
2885         else
2886                 p = strjoin("/etc/systemd/system/", u->id, ".d", NULL);
2887         if (!p)
2888                 return -ENOMEM;
2889
2890         q = strjoin(p, "/50-", name, ".conf", NULL);
2891         if (!q) {
2892                 free(p);
2893                 return -ENOMEM;
2894         }
2895
2896         *_p = p;
2897         *_q = q;
2898         return 0;
2899 }
2900
2901 int unit_write_drop_in(Unit *u, bool runtime, const char *name, const char *data) {
2902         _cleanup_free_ char *p = NULL, *q = NULL;
2903         int r;
2904
2905         assert(u);
2906
2907         r = drop_in_file(u, runtime, name, &p, &q);
2908         if (r < 0)
2909                 return r;
2910
2911         mkdir_p(p, 0755);
2912         return write_string_file_atomic_label(q, data);
2913 }
2914
2915 int unit_remove_drop_in(Unit *u, bool runtime, const char *name) {
2916         _cleanup_free_ char *p = NULL, *q = NULL;
2917         int r;
2918
2919         assert(u);
2920
2921         r = drop_in_file(u, runtime, name, &p, &q);
2922         if (unlink(q) < 0)
2923                 r = -errno;
2924         else
2925                 r = 0;
2926
2927         rmdir(p);
2928         return r;
2929 }
2930
2931 int unit_kill_context(
2932                 Unit *u,
2933                 KillContext *c,
2934                 bool sigkill,
2935                 pid_t main_pid,
2936                 pid_t control_pid,
2937                 bool main_pid_alien) {
2938
2939         int sig, wait_for_exit = 0, r;
2940
2941         assert(u);
2942         assert(c);
2943
2944         if (c->kill_mode == KILL_NONE)
2945                 return 0;
2946
2947         sig = sigkill ? SIGKILL : c->kill_signal;
2948
2949         if (main_pid > 0) {
2950                 r = kill_and_sigcont(main_pid, sig);
2951
2952                 if (r < 0 && r != -ESRCH) {
2953                         _cleanup_free_ char *comm = NULL;
2954                         get_process_comm(main_pid, &comm);
2955
2956                         log_warning_unit(u->id, "Failed to kill main process %li (%s): %s",
2957                                          (long) main_pid, strna(comm), strerror(-r));
2958                 } else
2959                         wait_for_exit = !main_pid_alien;
2960         }
2961
2962         if (control_pid > 0) {
2963                 r = kill_and_sigcont(control_pid, sig);
2964
2965                 if (r < 0 && r != -ESRCH) {
2966                         _cleanup_free_ char *comm = NULL;
2967                         get_process_comm(control_pid, &comm);
2968
2969                         log_warning_unit(u->id,
2970                                          "Failed to kill control process %li (%s): %s",
2971                                          (long) control_pid, strna(comm), strerror(-r));
2972                 } else
2973                         wait_for_exit = true;
2974         }
2975
2976         if (c->kill_mode == KILL_CONTROL_GROUP) {
2977                 _cleanup_set_free_ Set *pid_set = NULL;
2978
2979                 pid_set = set_new(trivial_hash_func, trivial_compare_func);
2980                 if (!pid_set)
2981                         return -ENOMEM;
2982
2983                 /* Exclude the main/control pids from being killed via the cgroup */
2984                 if (main_pid > 0) {
2985                         r = set_put(pid_set, LONG_TO_PTR(main_pid));
2986                         if (r < 0)
2987                                 return r;
2988                 }
2989
2990                 if (control_pid > 0) {
2991                         r = set_put(pid_set, LONG_TO_PTR(control_pid));
2992                         if (r < 0)
2993                                 return r;
2994                 }
2995
2996                 r = cgroup_bonding_kill_list(u->cgroup_bondings, sig, true, false, pid_set, NULL);
2997                 if (r < 0) {
2998                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
2999                                 log_warning_unit(u->id, "Failed to kill control group: %s", strerror(-r));
3000                 } else if (r > 0)
3001                         wait_for_exit = true;
3002         }
3003
3004         return wait_for_exit;
3005 }
3006
3007 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
3008         [UNIT_ACTIVE] = "active",
3009         [UNIT_RELOADING] = "reloading",
3010         [UNIT_INACTIVE] = "inactive",
3011         [UNIT_FAILED] = "failed",
3012         [UNIT_ACTIVATING] = "activating",
3013         [UNIT_DEACTIVATING] = "deactivating"
3014 };
3015
3016 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
3017
3018 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
3019         [UNIT_REQUIRES] = "Requires",
3020         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
3021         [UNIT_REQUISITE] = "Requisite",
3022         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
3023         [UNIT_WANTS] = "Wants",
3024         [UNIT_BINDS_TO] = "BindsTo",
3025         [UNIT_PART_OF] = "PartOf",
3026         [UNIT_REQUIRED_BY] = "RequiredBy",
3027         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
3028         [UNIT_WANTED_BY] = "WantedBy",
3029         [UNIT_BOUND_BY] = "BoundBy",
3030         [UNIT_CONSISTS_OF] = "ConsistsOf",
3031         [UNIT_CONFLICTS] = "Conflicts",
3032         [UNIT_CONFLICTED_BY] = "ConflictedBy",
3033         [UNIT_BEFORE] = "Before",
3034         [UNIT_AFTER] = "After",
3035         [UNIT_ON_FAILURE] = "OnFailure",
3036         [UNIT_TRIGGERS] = "Triggers",
3037         [UNIT_TRIGGERED_BY] = "TriggeredBy",
3038         [UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",
3039         [UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom",
3040         [UNIT_REFERENCES] = "References",
3041         [UNIT_REFERENCED_BY] = "ReferencedBy",
3042 };
3043
3044 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);