src/unit.c

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