src/login/logind-user.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6
   7 #include "alloc-util.h"
   8 #include "bus-common-errors.h"
   9 #include "bus-error.h"
  10 #include "bus-util.h"
  11 #include "cgroup-util.h"
  12 #include "clean-ipc.h"
  13 #include "env-file.h"
  14 #include "escape.h"
  15 #include "fd-util.h"
  16 #include "fileio.h"
  17 #include "format-util.h"
  18 #include "fs-util.h"
  19 #include "hashmap.h"
  20 #include "label.h"
  21 #include "limits-util.h"
  22 #include "logind-user.h"
  23 #include "mkdir.h"
  24 #include "parse-util.h"
  25 #include "path-util.h"
  26 #include "rm-rf.h"
  27 #include "serialize.h"
  28 #include "special.h"
  29 #include "stdio-util.h"
  30 #include "string-table.h"
  31 #include "strv.h"
  32 #include "tmpfile-util.h"
  33 #include "unit-name.h"
  34 #include "user-util.h"
  35 #include "util.h"
  36
  37 int user_new(User **ret,
  38              Manager *m,
  39              uid_t uid,
  40              gid_t gid,
  41              const char *name,
  42              const char *home) {
  43
  44         _cleanup_(user_freep) User *u = NULL;
  45         char lu[DECIMAL_STR_MAX(uid_t) + 1];
  46         int r;
  47
  48         assert(ret);
  49         assert(m);
  50         assert(name);
  51
  52         u = new(User, 1);
  53         if (!u)
  54                 return -ENOMEM;
  55
  56         *u = (User) {
  57                 .manager = m,
  58                 .uid = uid,
  59                 .gid = gid,
  60                 .last_session_timestamp = USEC_INFINITY,
  61         };
  62
  63         u->name = strdup(name);
  64         if (!u->name)
  65                 return -ENOMEM;
  66
  67         u->home = strdup(home);
  68         if (!u->home)
  69                 return -ENOMEM;
  70
  71         path_simplify(u->home, true);
  72
  73         if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
  74                 return -ENOMEM;
  75
  76         if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
  77                 return -ENOMEM;
  78
  79         xsprintf(lu, UID_FMT, uid);
  80         r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
  81         if (r < 0)
  82                 return r;
  83
  84         r = unit_name_build("user", lu, ".service", &u->service);
  85         if (r < 0)
  86                 return r;
  87
  88         r = unit_name_build("user-runtime-dir", lu, ".service", &u->runtime_dir_service);
  89         if (r < 0)
  90                 return r;
  91
  92         r = hashmap_put(m->users, UID_TO_PTR(uid), u);
  93         if (r < 0)
  94                 return r;
  95
  96         r = hashmap_put(m->user_units, u->slice, u);
  97         if (r < 0)
  98                 return r;
  99
 100         r = hashmap_put(m->user_units, u->service, u);
 101         if (r < 0)
 102                 return r;
 103
 104         r = hashmap_put(m->user_units, u->runtime_dir_service, u);
 105         if (r < 0)
 106                 return r;
 107
 108         *ret = TAKE_PTR(u);
 109         return 0;
 110 }
 111
 112 User *user_free(User *u) {
 113         if (!u)
 114                 return NULL;
 115
 116         if (u->in_gc_queue)
 117                 LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
 118
 119         while (u->sessions)
 120                 session_free(u->sessions);
 121
 122         if (u->service)
 123                 hashmap_remove_value(u->manager->user_units, u->service, u);
 124
 125         if (u->runtime_dir_service)
 126                 hashmap_remove_value(u->manager->user_units, u->runtime_dir_service, u);
 127
 128         if (u->slice)
 129                 hashmap_remove_value(u->manager->user_units, u->slice, u);
 130
 131         hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
 132
 133         (void) sd_event_source_unref(u->timer_event_source);
 134
 135         u->service_job = mfree(u->service_job);
 136
 137         u->service = mfree(u->service);
 138         u->runtime_dir_service = mfree(u->runtime_dir_service);
 139         u->slice = mfree(u->slice);
 140         u->runtime_path = mfree(u->runtime_path);
 141         u->state_file = mfree(u->state_file);
 142         u->name = mfree(u->name);
 143         u->home = mfree(u->home);
 144
 145         return mfree(u);
 146 }
 147
 148 static int user_save_internal(User *u) {
 149         _cleanup_free_ char *temp_path = NULL;
 150         _cleanup_fclose_ FILE *f = NULL;
 151         int r;
 152
 153         assert(u);
 154         assert(u->state_file);
 155
 156         r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0, MKDIR_WARN_MODE);
 157         if (r < 0)
 158                 goto fail;
 159
 160         r = fopen_temporary(u->state_file, &f, &temp_path);
 161         if (r < 0)
 162                 goto fail;
 163
 164         (void) fchmod(fileno(f), 0644);
 165
 166         fprintf(f,
 167                 "# This is private data. Do not parse.\n"
 168                 "NAME=%s\n"
 169                 "STATE=%s\n"         /* friendly user-facing state */
 170                 "STOPPING=%s\n",     /* low-level state */
 171                 u->name,
 172                 user_state_to_string(user_get_state(u)),
 173                 yes_no(u->stopping));
 174
 175         /* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
 176         if (u->runtime_path)
 177                 fprintf(f, "RUNTIME=%s\n", u->runtime_path);
 178
 179         if (u->service_job)
 180                 fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
 181
 182         if (u->display)
 183                 fprintf(f, "DISPLAY=%s\n", u->display->id);
 184
 185         if (dual_timestamp_is_set(&u->timestamp))
 186                 fprintf(f,
 187                         "REALTIME="USEC_FMT"\n"
 188                         "MONOTONIC="USEC_FMT"\n",
 189                         u->timestamp.realtime,
 190                         u->timestamp.monotonic);
 191
 192         if (u->last_session_timestamp != USEC_INFINITY)
 193                 fprintf(f, "LAST_SESSION_TIMESTAMP=" USEC_FMT "\n",
 194                         u->last_session_timestamp);
 195
 196         if (u->sessions) {
 197                 Session *i;
 198                 bool first;
 199
 200                 fputs("SESSIONS=", f);
 201                 first = true;
 202                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 203                         if (first)
 204                                 first = false;
 205                         else
 206                                 fputc(' ', f);
 207
 208                         fputs(i->id, f);
 209                 }
 210
 211                 fputs("\nSEATS=", f);
 212                 first = true;
 213                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 214                         if (!i->seat)
 215                                 continue;
 216
 217                         if (first)
 218                                 first = false;
 219                         else
 220                                 fputc(' ', f);
 221
 222                         fputs(i->seat->id, f);
 223                 }
 224
 225                 fputs("\nACTIVE_SESSIONS=", f);
 226                 first = true;
 227                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 228                         if (!session_is_active(i))
 229                                 continue;
 230
 231                         if (first)
 232                                 first = false;
 233                         else
 234                                 fputc(' ', f);
 235
 236                         fputs(i->id, f);
 237                 }
 238
 239                 fputs("\nONLINE_SESSIONS=", f);
 240                 first = true;
 241                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 242                         if (session_get_state(i) == SESSION_CLOSING)
 243                                 continue;
 244
 245                         if (first)
 246                                 first = false;
 247                         else
 248                                 fputc(' ', f);
 249
 250                         fputs(i->id, f);
 251                 }
 252
 253                 fputs("\nACTIVE_SEATS=", f);
 254                 first = true;
 255                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 256                         if (!session_is_active(i) || !i->seat)
 257                                 continue;
 258
 259                         if (first)
 260                                 first = false;
 261                         else
 262                                 fputc(' ', f);
 263
 264                         fputs(i->seat->id, f);
 265                 }
 266
 267                 fputs("\nONLINE_SEATS=", f);
 268                 first = true;
 269                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 270                         if (session_get_state(i) == SESSION_CLOSING || !i->seat)
 271                                 continue;
 272
 273                         if (first)
 274                                 first = false;
 275                         else
 276                                 fputc(' ', f);
 277
 278                         fputs(i->seat->id, f);
 279                 }
 280                 fputc('\n', f);
 281         }
 282
 283         r = fflush_and_check(f);
 284         if (r < 0)
 285                 goto fail;
 286
 287         if (rename(temp_path, u->state_file) < 0) {
 288                 r = -errno;
 289                 goto fail;
 290         }
 291
 292         return 0;
 293
 294 fail:
 295         (void) unlink(u->state_file);
 296
 297         if (temp_path)
 298                 (void) unlink(temp_path);
 299
 300         return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
 301 }
 302
 303 int user_save(User *u) {
 304         assert(u);
 305
 306         if (!u->started)
 307                 return 0;
 308
 309         return user_save_internal(u);
 310 }
 311
 312 int user_load(User *u) {
 313         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *stopping = NULL, *last_session_timestamp = NULL;
 314         int r;
 315
 316         assert(u);
 317
 318         r = parse_env_file(NULL, u->state_file,
 319                            "SERVICE_JOB",            &u->service_job,
 320                            "STOPPING",               &stopping,
 321                            "REALTIME",               &realtime,
 322                            "MONOTONIC",              &monotonic,
 323                            "LAST_SESSION_TIMESTAMP", &last_session_timestamp);
 324         if (r == -ENOENT)
 325                 return 0;
 326         if (r < 0)
 327                 return log_error_errno(r, "Failed to read %s: %m", u->state_file);
 328
 329         if (stopping) {
 330                 r = parse_boolean(stopping);
 331                 if (r < 0)
 332                         log_debug_errno(r, "Failed to parse 'STOPPING' boolean: %s", stopping);
 333                 else
 334                         u->stopping = r;
 335         }
 336
 337         if (realtime)
 338                 (void) deserialize_usec(realtime, &u->timestamp.realtime);
 339         if (monotonic)
 340                 (void) deserialize_usec(monotonic, &u->timestamp.monotonic);
 341         if (last_session_timestamp)
 342                 (void) deserialize_usec(last_session_timestamp, &u->last_session_timestamp);
 343
 344         return 0;
 345 }
 346
 347 static void user_start_service(User *u) {
 348         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 349         int r;
 350
 351         assert(u);
 352
 353         /* Start the service containing the "systemd --user" instance (user@.service). Note that we don't explicitly
 354          * start the per-user slice or the systemd-runtime-dir@.service instance, as those are pulled in both by
 355          * user@.service and the session scopes as dependencies. */
 356
 357         u->service_job = mfree(u->service_job);
 358
 359         r = manager_start_unit(u->manager, u->service, &error, &u->service_job);
 360         if (r < 0)
 361                 log_full_errno(sd_bus_error_has_name(&error, BUS_ERROR_UNIT_MASKED) ? LOG_DEBUG : LOG_WARNING, r,
 362                                "Failed to start user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 363 }
 364
 365 int user_start(User *u) {
 366         assert(u);
 367
 368         if (u->started && !u->stopping)
 369                 return 0;
 370
 371         /* If u->stopping is set, the user is marked for removal and service stop-jobs are queued. We have to clear
 372          * that flag before queueing the start-jobs again. If they succeed, the user object can be re-used just fine
 373          * (pid1 takes care of job-ordering and proper restart), but if they fail, we want to force another user_stop()
 374          * so possibly pending units are stopped. */
 375         u->stopping = false;
 376
 377         if (!u->started)
 378                 log_debug("Starting services for new user %s.", u->name);
 379
 380         /* Save the user data so far, because pam_systemd will read the XDG_RUNTIME_DIR out of it while starting up
 381          * systemd --user.  We need to do user_save_internal() because we have not "officially" started yet. */
 382         user_save_internal(u);
 383
 384         /* Start user@UID.service */
 385         user_start_service(u);
 386
 387         if (!u->started) {
 388                 if (!dual_timestamp_is_set(&u->timestamp))
 389                         dual_timestamp_get(&u->timestamp);
 390                 user_send_signal(u, true);
 391                 u->started = true;
 392         }
 393
 394         /* Save new user data */
 395         user_save(u);
 396
 397         return 0;
 398 }
 399
 400 static void user_stop_service(User *u) {
 401         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 402         int r;
 403
 404         assert(u);
 405         assert(u->service);
 406
 407         /* The reverse of user_start_service(). Note that we only stop user@UID.service here, and let StopWhenUnneeded=
 408          * deal with the slice and the user-runtime-dir@.service instance. */
 409
 410         u->service_job = mfree(u->service_job);
 411
 412         r = manager_stop_unit(u->manager, u->service, &error, &u->service_job);
 413         if (r < 0)
 414                 log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 415 }
 416
 417 int user_stop(User *u, bool force) {
 418         Session *s;
 419         int r = 0;
 420         assert(u);
 421
 422         /* This is called whenever we begin with tearing down a user record. It's called in two cases: explicit API
 423          * request to do so via the bus (in which case 'force' is true) and automatically due to GC, if there's no
 424          * session left pinning it (in which case 'force' is false). Note that this just initiates tearing down of the
 425          * user, the User object will remain in memory until user_finalize() is called, see below. */
 426
 427         if (!u->started)
 428                 return 0;
 429
 430         if (u->stopping) { /* Stop jobs have already been queued */
 431                 user_save(u);
 432                 return 0;
 433         }
 434
 435         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 436                 int k;
 437
 438                 k = session_stop(s, force);
 439                 if (k < 0)
 440                         r = k;
 441         }
 442
 443         user_stop_service(u);
 444
 445         u->stopping = true;
 446
 447         user_save(u);
 448
 449         return r;
 450 }
 451
 452 int user_finalize(User *u) {
 453         Session *s;
 454         int r = 0, k;
 455
 456         assert(u);
 457
 458         /* Called when the user is really ready to be freed, i.e. when all unit stop jobs and suchlike for it are
 459          * done. This is called as a result of an earlier user_done() when all jobs are completed. */
 460
 461         if (u->started)
 462                 log_debug("User %s logged out.", u->name);
 463
 464         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 465                 k = session_finalize(s);
 466                 if (k < 0)
 467                         r = k;
 468         }
 469
 470         /* Clean SysV + POSIX IPC objects, but only if this is not a system user. Background: in many setups cronjobs
 471          * are run in full PAM and thus logind sessions, even if the code run doesn't belong to actual users but to
 472          * system components. Since enable RemoveIPC= globally for all users, we need to be a bit careful with such
 473          * cases, as we shouldn't accidentally remove a system service's IPC objects while it is running, just because
 474          * a cronjob running as the same user just finished. Hence: exclude system users generally from IPC clean-up,
 475          * and do it only for normal users. */
 476         if (u->manager->remove_ipc && !uid_is_system(u->uid)) {
 477                 k = clean_ipc_by_uid(u->uid);
 478                 if (k < 0)
 479                         r = k;
 480         }
 481
 482         (void) unlink(u->state_file);
 483         user_add_to_gc_queue(u);
 484
 485         if (u->started) {
 486                 user_send_signal(u, false);
 487                 u->started = false;
 488         }
 489
 490         return r;
 491 }
 492
 493 int user_get_idle_hint(User *u, dual_timestamp *t) {
 494         Session *s;
 495         bool idle_hint = true;
 496         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 497
 498         assert(u);
 499
 500         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 501                 dual_timestamp k;
 502                 int ih;
 503
 504                 ih = session_get_idle_hint(s, &k);
 505                 if (ih < 0)
 506                         return ih;
 507
 508                 if (!ih) {
 509                         if (!idle_hint) {
 510                                 if (k.monotonic < ts.monotonic)
 511                                         ts = k;
 512                         } else {
 513                                 idle_hint = false;
 514                                 ts = k;
 515                         }
 516                 } else if (idle_hint) {
 517
 518                         if (k.monotonic > ts.monotonic)
 519                                 ts = k;
 520                 }
 521         }
 522
 523         if (t)
 524                 *t = ts;
 525
 526         return idle_hint;
 527 }
 528
 529 int user_check_linger_file(User *u) {
 530         _cleanup_free_ char *cc = NULL;
 531         char *p = NULL;
 532
 533         cc = cescape(u->name);
 534         if (!cc)
 535                 return -ENOMEM;
 536
 537         p = strjoina("/var/lib/systemd/linger/", cc);
 538         if (access(p, F_OK) < 0) {
 539                 if (errno != ENOENT)
 540                         return -errno;
 541
 542                 return false;
 543         }
 544
 545         return true;
 546 }
 547
 548 static bool user_unit_active(User *u) {
 549         const char *i;
 550         int r;
 551
 552         assert(u->service);
 553         assert(u->runtime_dir_service);
 554         assert(u->slice);
 555
 556         FOREACH_STRING(i, u->service, u->runtime_dir_service, u->slice) {
 557                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 558
 559                 r = manager_unit_is_active(u->manager, i, &error);
 560                 if (r < 0)
 561                         log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", u->service, bus_error_message(&error, r));
 562                 if (r != 0)
 563                         return true;
 564         }
 565
 566         return false;
 567 }
 568
 569 bool user_may_gc(User *u, bool drop_not_started) {
 570         int r;
 571
 572         assert(u);
 573
 574         if (drop_not_started && !u->started)
 575                 return true;
 576
 577         if (u->sessions)
 578                 return false;
 579
 580         if (u->last_session_timestamp != USEC_INFINITY) {
 581                 /* All sessions have been closed. Let's see if we shall leave the user record around for a bit */
 582
 583                 if (u->manager->user_stop_delay == USEC_INFINITY)
 584                         return false; /* Leave it around forever! */
 585                 if (u->manager->user_stop_delay > 0 &&
 586                     now(CLOCK_MONOTONIC) < usec_add(u->last_session_timestamp, u->manager->user_stop_delay))
 587                         return false; /* Leave it around for a bit longer. */
 588         }
 589
 590         /* Is this a user that shall stay around forever ("linger")? Before we say "no" to GC'ing for lingering users, let's check
 591          * if any of the three units that we maintain for this user is still around. If none of them is,
 592          * there's no need to keep this user around even if lingering is enabled. */
 593         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 594                 return false;
 595
 596         /* Check if our job is still pending */
 597         if (u->service_job) {
 598                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 599
 600                 r = manager_job_is_active(u->manager, u->service_job, &error);
 601                 if (r < 0)
 602                         log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", u->service_job, bus_error_message(&error, r));
 603                 if (r != 0)
 604                         return false;
 605         }
 606
 607         /* Note that we don't care if the three units we manage for each user object are up or not, as we are managing
 608          * their state rather than tracking it. */
 609
 610         return true;
 611 }
 612
 613 void user_add_to_gc_queue(User *u) {
 614         assert(u);
 615
 616         if (u->in_gc_queue)
 617                 return;
 618
 619         LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
 620         u->in_gc_queue = true;
 621 }
 622
 623 UserState user_get_state(User *u) {
 624         Session *i;
 625
 626         assert(u);
 627
 628         if (u->stopping)
 629                 return USER_CLOSING;
 630
 631         if (!u->started || u->service_job)
 632                 return USER_OPENING;
 633
 634         if (u->sessions) {
 635                 bool all_closing = true;
 636
 637                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 638                         SessionState state;
 639
 640                         state = session_get_state(i);
 641                         if (state == SESSION_ACTIVE)
 642                                 return USER_ACTIVE;
 643                         if (state != SESSION_CLOSING)
 644                                 all_closing = false;
 645                 }
 646
 647                 return all_closing ? USER_CLOSING : USER_ONLINE;
 648         }
 649
 650         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 651                 return USER_LINGERING;
 652
 653         return USER_CLOSING;
 654 }
 655
 656 int user_kill(User *u, int signo) {
 657         assert(u);
 658
 659         return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
 660 }
 661
 662 static bool elect_display_filter(Session *s) {
 663         /* Return true if the session is a candidate for the user’s ‘primary session’ or ‘display’. */
 664         assert(s);
 665
 666         return s->class == SESSION_USER && s->started && !s->stopping;
 667 }
 668
 669 static int elect_display_compare(Session *s1, Session *s2) {
 670         /* Indexed by SessionType. Lower numbers mean more preferred. */
 671         const int type_ranks[_SESSION_TYPE_MAX] = {
 672                 [SESSION_UNSPECIFIED] = 0,
 673                 [SESSION_TTY] = -2,
 674                 [SESSION_X11] = -3,
 675                 [SESSION_WAYLAND] = -3,
 676                 [SESSION_MIR] = -3,
 677                 [SESSION_WEB] = -1,
 678         };
 679
 680         /* Calculate the partial order relationship between s1 and s2,
 681          * returning < 0 if s1 is preferred as the user’s ‘primary session’,
 682          * 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
 683          * is preferred.
 684          *
 685          * s1 or s2 may be NULL. */
 686         if (!s1 && !s2)
 687                 return 0;
 688
 689         if ((s1 == NULL) != (s2 == NULL))
 690                 return (s1 == NULL) - (s2 == NULL);
 691
 692         if (s1->stopping != s2->stopping)
 693                 return s1->stopping - s2->stopping;
 694
 695         if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
 696                 return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
 697
 698         if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
 699                 return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
 700
 701         if (s1->type != s2->type)
 702                 return type_ranks[s1->type] - type_ranks[s2->type];
 703
 704         return 0;
 705 }
 706
 707 void user_elect_display(User *u) {
 708         Session *s;
 709
 710         assert(u);
 711
 712         /* This elects a primary session for each user, which we call the "display". We try to keep the assignment
 713          * stable, but we "upgrade" to better choices. */
 714         log_debug("Electing new display for user %s", u->name);
 715
 716         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 717                 if (!elect_display_filter(s)) {
 718                         log_debug("Ignoring session %s", s->id);
 719                         continue;
 720                 }
 721
 722                 if (elect_display_compare(s, u->display) < 0) {
 723                         log_debug("Choosing session %s in preference to %s", s->id, u->display ? u->display->id : "-");
 724                         u->display = s;
 725                 }
 726         }
 727 }
 728
 729 static int user_stop_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
 730         User *u = userdata;
 731
 732         assert(u);
 733         user_add_to_gc_queue(u);
 734
 735         return 0;
 736 }
 737
 738 void user_update_last_session_timer(User *u) {
 739         int r;
 740
 741         assert(u);
 742
 743         if (u->sessions) {
 744                 /* There are sessions, turn off the timer */
 745                 u->last_session_timestamp = USEC_INFINITY;
 746                 u->timer_event_source = sd_event_source_unref(u->timer_event_source);
 747                 return;
 748         }
 749
 750         if (u->last_session_timestamp != USEC_INFINITY)
 751                 return; /* Timer already started */
 752
 753         u->last_session_timestamp = now(CLOCK_MONOTONIC);
 754
 755         assert(!u->timer_event_source);
 756
 757         if (IN_SET(u->manager->user_stop_delay, 0, USEC_INFINITY))
 758                 return;
 759
 760         if (sd_event_get_state(u->manager->event) == SD_EVENT_FINISHED) {
 761                 log_debug("Not allocating user stop timeout, since we are already exiting.");
 762                 return;
 763         }
 764
 765         r = sd_event_add_time(u->manager->event,
 766                               &u->timer_event_source,
 767                               CLOCK_MONOTONIC,
 768                               usec_add(u->last_session_timestamp, u->manager->user_stop_delay), 0,
 769                               user_stop_timeout_callback, u);
 770         if (r < 0)
 771                 log_warning_errno(r, "Failed to enqueue user stop event source, ignoring: %m");
 772
 773         if (DEBUG_LOGGING) {
 774                 char s[FORMAT_TIMESPAN_MAX];
 775
 776                 log_debug("Last session of user '%s' logged out, terminating user context in %s.",
 777                           u->name,
 778                           format_timespan(s, sizeof(s), u->manager->user_stop_delay, USEC_PER_MSEC));
 779         }
 780 }
 781
 782 static const char* const user_state_table[_USER_STATE_MAX] = {
 783         [USER_OFFLINE] = "offline",
 784         [USER_OPENING] = "opening",
 785         [USER_LINGERING] = "lingering",
 786         [USER_ONLINE] = "online",
 787         [USER_ACTIVE] = "active",
 788         [USER_CLOSING] = "closing"
 789 };
 790
 791 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
 792
 793 int config_parse_tmpfs_size(
 794                 const char* unit,
 795                 const char *filename,
 796                 unsigned line,
 797                 const char *section,
 798                 unsigned section_line,
 799                 const char *lvalue,
 800                 int ltype,
 801                 const char *rvalue,
 802                 void *data,
 803                 void *userdata) {
 804
 805         uint64_t *sz = data;
 806         int r;
 807
 808         assert(filename);
 809         assert(lvalue);
 810         assert(rvalue);
 811         assert(data);
 812
 813         /* First, try to parse as percentage */
 814         r = parse_permille(rvalue);
 815         if (r > 0 && r < 1000)
 816                 *sz = physical_memory_scale(r, 1000U);
 817         else {
 818                 uint64_t k;
 819
 820                 /* If the passed argument was not a percentage, or out of range, parse as byte size */
 821
 822                 r = parse_size(rvalue, 1024, &k);
 823                 if (r >= 0 && (k <= 0 || (uint64_t) (size_t) k != k))
 824                         r = -ERANGE;
 825                 if (r < 0) {
 826                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value '%s', ignoring: %m", rvalue);
 827                         return 0;
 828                 }
 829
 830                 *sz = PAGE_ALIGN((size_t) k);
 831         }
 832
 833         return 0;
 834 }
 835
 836 int config_parse_compat_user_tasks_max(
 837                 const char *unit,
 838                 const char *filename,
 839                 unsigned line,
 840                 const char *section,
 841                 unsigned section_line,
 842                 const char *lvalue,
 843                 int ltype,
 844                 const char *rvalue,
 845                 void *data,
 846                 void *userdata) {
 847
 848         assert(filename);
 849         assert(lvalue);
 850         assert(rvalue);
 851         assert(data);
 852
 853         log_syntax(unit, LOG_NOTICE, filename, line, 0,
 854                    "Support for option %s= has been removed.",
 855                    lvalue);
 856         log_info("Hint: try creating /etc/systemd/system/user-.slice.d/50-limits.conf with:\n"
 857                  "        [Slice]\n"
 858                  "        TasksMax=%s",
 859                  rvalue);
 860         return 0;
 861 }