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