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