src/login/logind-user.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <string.h>
  10 #include <sys/mount.h>
  11 #include <unistd.h>
  12 #include <stdio_ext.h>
  13
  14 #include "alloc-util.h"
  15 #include "bus-common-errors.h"
  16 #include "bus-error.h"
  17 #include "bus-util.h"
  18 #include "cgroup-util.h"
  19 #include "clean-ipc.h"
  20 #include "conf-parser.h"
  21 #include "escape.h"
  22 #include "fd-util.h"
  23 #include "fileio.h"
  24 #include "format-util.h"
  25 #include "fs-util.h"
  26 #include "hashmap.h"
  27 #include "label.h"
  28 #include "logind-user.h"
  29 #include "mkdir.h"
  30 #include "mount-util.h"
  31 #include "parse-util.h"
  32 #include "path-util.h"
  33 #include "rm-rf.h"
  34 #include "smack-util.h"
  35 #include "special.h"
  36 #include "stdio-util.h"
  37 #include "string-table.h"
  38 #include "unit-name.h"
  39 #include "user-util.h"
  40 #include "util.h"
  41
  42 int user_new(User **out, Manager *m, uid_t uid, gid_t gid, const char *name) {
  43         _cleanup_(user_freep) User *u = NULL;
  44         char lu[DECIMAL_STR_MAX(uid_t) + 1];
  45         int r;
  46
  47         assert(out);
  48         assert(m);
  49         assert(name);
  50
  51         u = new0(User, 1);
  52         if (!u)
  53                 return -ENOMEM;
  54
  55         u->manager = m;
  56         u->uid = uid;
  57         u->gid = gid;
  58         xsprintf(lu, UID_FMT, uid);
  59
  60         u->name = strdup(name);
  61         if (!u->name)
  62                 return -ENOMEM;
  63
  64         if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
  65                 return -ENOMEM;
  66
  67         if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
  68                 return -ENOMEM;
  69
  70         r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
  71         if (r < 0)
  72                 return r;
  73
  74         r = unit_name_build("user", lu, ".service", &u->service);
  75         if (r < 0)
  76                 return r;
  77
  78         r = hashmap_put(m->users, UID_TO_PTR(uid), u);
  79         if (r < 0)
  80                 return r;
  81
  82         r = hashmap_put(m->user_units, u->slice, u);
  83         if (r < 0)
  84                 return r;
  85
  86         r = hashmap_put(m->user_units, u->service, u);
  87         if (r < 0)
  88                 return r;
  89
  90         *out = TAKE_PTR(u);
  91
  92         return 0;
  93 }
  94
  95 User *user_free(User *u) {
  96         if (!u)
  97                 return NULL;
  98
  99         if (u->in_gc_queue)
 100                 LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
 101
 102         while (u->sessions)
 103                 session_free(u->sessions);
 104
 105         if (u->service)
 106                 hashmap_remove_value(u->manager->user_units, u->service, u);
 107
 108         if (u->slice)
 109                 hashmap_remove_value(u->manager->user_units, u->slice, u);
 110
 111         hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
 112
 113 #if 0 /// elogind neither supports slice nor service jobs.
 114         u->slice_job = mfree(u->slice_job);
 115         u->service_job = mfree(u->service_job);
 116 #endif // 0
 117
 118         u->service = mfree(u->service);
 119         u->slice = mfree(u->slice);
 120         u->runtime_path = mfree(u->runtime_path);
 121         u->state_file = mfree(u->state_file);
 122         u->name = mfree(u->name);
 123
 124         return mfree(u);
 125 }
 126
 127 static int user_save_internal(User *u) {
 128         _cleanup_free_ char *temp_path = NULL;
 129         _cleanup_fclose_ FILE *f = NULL;
 130         int r;
 131
 132         assert(u);
 133         assert(u->state_file);
 134
 135         r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0, MKDIR_WARN_MODE);
 136         if (r < 0)
 137                 goto fail;
 138
 139         r = fopen_temporary(u->state_file, &f, &temp_path);
 140         if (r < 0)
 141                 goto fail;
 142
 143         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 144         (void) fchmod(fileno(f), 0644);
 145
 146         fprintf(f,
 147                 "# This is private data. Do not parse.\n"
 148                 "NAME=%s\n"
 149                 "STATE=%s\n",
 150                 u->name,
 151                 user_state_to_string(user_get_state(u)));
 152
 153         /* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
 154         if (u->runtime_path)
 155                 fprintf(f, "RUNTIME=%s\n", u->runtime_path);
 156
 157 #if 0 /// elogind neither supports service nor slice jobs
 158         if (u->service_job)
 159                 fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
 160
 161         if (u->slice_job)
 162                 fprintf(f, "SLICE_JOB=%s\n", u->slice_job);
 163 #endif // 0
 164
 165         if (u->display)
 166                 fprintf(f, "DISPLAY=%s\n", u->display->id);
 167
 168         if (dual_timestamp_is_set(&u->timestamp))
 169                 fprintf(f,
 170                         "REALTIME="USEC_FMT"\n"
 171                         "MONOTONIC="USEC_FMT"\n",
 172                         u->timestamp.realtime,
 173                         u->timestamp.monotonic);
 174
 175         if (u->sessions) {
 176                 Session *i;
 177                 bool first;
 178
 179                 fputs("SESSIONS=", f);
 180                 first = true;
 181                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 182                         if (first)
 183                                 first = false;
 184                         else
 185                                 fputc(' ', f);
 186
 187                         fputs(i->id, f);
 188                 }
 189
 190                 fputs("\nSEATS=", f);
 191                 first = true;
 192                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 193                         if (!i->seat)
 194                                 continue;
 195
 196                         if (first)
 197                                 first = false;
 198                         else
 199                                 fputc(' ', f);
 200
 201                         fputs(i->seat->id, f);
 202                 }
 203
 204                 fputs("\nACTIVE_SESSIONS=", f);
 205                 first = true;
 206                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 207                         if (!session_is_active(i))
 208                                 continue;
 209
 210                         if (first)
 211                                 first = false;
 212                         else
 213                                 fputc(' ', f);
 214
 215                         fputs(i->id, f);
 216                 }
 217
 218                 fputs("\nONLINE_SESSIONS=", f);
 219                 first = true;
 220                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 221                         if (session_get_state(i) == SESSION_CLOSING)
 222                                 continue;
 223
 224                         if (first)
 225                                 first = false;
 226                         else
 227                                 fputc(' ', f);
 228
 229                         fputs(i->id, f);
 230                 }
 231
 232                 fputs("\nACTIVE_SEATS=", f);
 233                 first = true;
 234                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 235                         if (!session_is_active(i) || !i->seat)
 236                                 continue;
 237
 238                         if (first)
 239                                 first = false;
 240                         else
 241                                 fputc(' ', f);
 242
 243                         fputs(i->seat->id, f);
 244                 }
 245
 246                 fputs("\nONLINE_SEATS=", f);
 247                 first = true;
 248                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 249                         if (session_get_state(i) == SESSION_CLOSING || !i->seat)
 250                                 continue;
 251
 252                         if (first)
 253                                 first = false;
 254                         else
 255                                 fputc(' ', f);
 256
 257                         fputs(i->seat->id, f);
 258                 }
 259                 fputc('\n', f);
 260         }
 261
 262         r = fflush_and_check(f);
 263         if (r < 0)
 264                 goto fail;
 265
 266         if (rename(temp_path, u->state_file) < 0) {
 267                 r = -errno;
 268                 goto fail;
 269         }
 270
 271         return 0;
 272
 273 fail:
 274         (void) unlink(u->state_file);
 275
 276         if (temp_path)
 277                 (void) unlink(temp_path);
 278
 279         return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
 280 }
 281
 282 int user_save(User *u) {
 283         assert(u);
 284
 285         if (!u->started)
 286                 return 0;
 287
 288         return user_save_internal (u);
 289 }
 290
 291 int user_load(User *u) {
 292         _cleanup_free_ char *display = NULL, *realtime = NULL, *monotonic = NULL;
 293         Session *s = NULL;
 294         int r;
 295
 296         assert(u);
 297
 298         r = parse_env_file(u->state_file, NEWLINE,
 299 #if 0 /// elogind neither supports service nor slice jobs
 300                            "SERVICE_JOB", &u->service_job,
 301                            "SLICE_JOB",   &u->slice_job,
 302 #endif // 0
 303                            "DISPLAY",     &display,
 304                            "REALTIME",    &realtime,
 305                            "MONOTONIC",   &monotonic,
 306                            NULL);
 307         if (r < 0) {
 308                 if (r == -ENOENT)
 309                         return 0;
 310
 311                 return log_error_errno(r, "Failed to read %s: %m", u->state_file);
 312         }
 313
 314         if (display)
 315                 s = hashmap_get(u->manager->sessions, display);
 316
 317         if (s && s->display && display_is_local(s->display))
 318                 u->display = s;
 319
 320         if (realtime)
 321                 timestamp_deserialize(realtime, &u->timestamp.realtime);
 322         if (monotonic)
 323                 timestamp_deserialize(monotonic, &u->timestamp.monotonic);
 324
 325         return r;
 326 }
 327
 328
 329 #if 0 /// elogind can not ask systemd via dbus to start user services
 330 #else
 331         assert(u);
 332
 333         hashmap_put(u->manager->user_units, u->slice, u);
 334 #endif // 0
 335 static int user_start_service(User *u) {
 336 #if 0 /// elogind can not ask systemd via dbus to start user services
 337         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 338         char *job;
 339         int r;
 340
 341         assert(u);
 342
 343         u->service_job = mfree(u->service_job);
 344
 345         r = manager_start_unit(
 346                         u->manager,
 347                         u->service,
 348                         &error,
 349                         &job);
 350         if (r < 0)
 351                 /* we don't fail due to this, let's try to continue */
 352                 log_error_errno(r, "Failed to start user service, ignoring: %s", bus_error_message(&error, r));
 353         else
 354                 u->service_job = job;
 355 #else
 356         assert(u);
 357
 358         hashmap_put(u->manager->user_units, u->service, u);
 359 #endif // 0
 360
 361         return 0;
 362 }
 363
 364 int user_start(User *u) {
 365         int r;
 366
 367         assert(u);
 368
 369         if (u->started && !u->stopping)
 370                 return 0;
 371
 372         /*
 373          * If u->stopping is set, the user is marked for removal and the slice
 374          * and service stop-jobs are queued. We have to clear that flag before
 375          * queing the start-jobs again. If they succeed, the user object can be
 376          * re-used just fine (pid1 takes care of job-ordering and proper
 377          * restart), but if they fail, we want to force another user_stop() so
 378          * possibly pending units are stopped.
 379          * Note that we don't clear u->started, as we have no clue what state
 380          * the user is in on failure here. Hence, we pretend the user is
 381          * running so it will be properly taken down by GC. However, we clearly
 382          * return an error from user_start() in that case, so no further
 383          * reference to the user is taken.
 384          */
 385         u->stopping = false;
 386
 387         if (!u->started)
 388                 log_debug("Starting services for new user %s.", u->name);
 389
 390         /* Save the user data so far, because pam_systemd will read the
 391          * XDG_RUNTIME_DIR out of it while starting up systemd --user.
 392          * We need to do user_save_internal() because we have not
 393          * "officially" started yet. */
 394         user_save_internal(u);
 395
 396         /* Spawn user systemd */
 397         r = user_start_service(u);
 398         if (r < 0)
 399                 return r;
 400
 401         if (!u->started) {
 402                 if (!dual_timestamp_is_set(&u->timestamp))
 403                         dual_timestamp_get(&u->timestamp);
 404                 user_send_signal(u, true);
 405                 u->started = true;
 406         }
 407
 408         /* Save new user data */
 409         user_save(u);
 410
 411         return 0;
 412 }
 413
 414 #if 0 /// UNNEEDED by elogind
 415 static int user_stop_slice(User *u) {
 416         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 417         char *job;
 418         int r;
 419
 420         assert(u);
 421
 422         r = manager_stop_unit(u->manager, u->slice, &error, &job);
 423         if (r < 0) {
 424                 log_error("Failed to stop user slice: %s", bus_error_message(&error, r));
 425                 return r;
 426         }
 427
 428         free(u->slice_job);
 429         u->slice_job = job;
 430
 431         return r;
 432 }
 433
 434 static int user_stop_service(User *u) {
 435         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 436         char *job;
 437         int r;
 438
 439         assert(u);
 440
 441         r = manager_stop_unit(u->manager, u->service, &error, &job);
 442         if (r < 0) {
 443                 log_error("Failed to stop user service: %s", bus_error_message(&error, r));
 444                 return r;
 445         }
 446
 447         free_and_replace(u->service_job, job);
 448         return r;
 449 }
 450 #endif // 0
 451
 452 int user_stop(User *u, bool force) {
 453         Session *s;
 454         int r = 0, k;
 455         assert(u);
 456
 457         /* Stop jobs have already been queued */
 458         if (u->stopping) {
 459                 user_save(u);
 460                 return r;
 461         }
 462
 463         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 464                 k = session_stop(s, force);
 465                 if (k < 0)
 466                         r = k;
 467         }
 468
 469         /* Kill systemd */
 470 #if 0 /// elogind does not support service or slice jobs
 471         k = user_stop_service(u);
 472         if (k < 0)
 473                 r = k;
 474
 475         /* Kill cgroup */
 476         k = user_stop_slice(u);
 477         if (k < 0)
 478                 r = k;
 479 #endif // 0
 480
 481         u->stopping = true;
 482
 483         user_save(u);
 484
 485 #if 1 /// elogind must queue this user again
 486         user_add_to_gc_queue(u);
 487 #endif // 1
 488         return r;
 489 }
 490
 491 int user_finalize(User *u) {
 492         Session *s;
 493         int r = 0, k;
 494
 495         assert(u);
 496
 497         if (u->started)
 498                 log_debug("User %s logged out.", u->name);
 499
 500         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 501                 k = session_finalize(s);
 502                 if (k < 0)
 503                         r = k;
 504         }
 505
 506         /* Clean SysV + POSIX IPC objects, but only if this is not a system user. Background: in many setups cronjobs
 507          * are run in full PAM and thus logind sessions, even if the code run doesn't belong to actual users but to
 508          * system components. Since enable RemoveIPC= globally for all users, we need to be a bit careful with such
 509          * cases, as we shouldn't accidentally remove a system service's IPC objects while it is running, just because
 510          * a cronjob running as the same user just finished. Hence: exclude system users generally from IPC clean-up,
 511          * and do it only for normal users. */
 512         if (u->manager->remove_ipc && !uid_is_system(u->uid)) {
 513                 k = clean_ipc_by_uid(u->uid);
 514                 if (k < 0)
 515                         r = k;
 516         }
 517
 518         unlink(u->state_file);
 519         user_add_to_gc_queue(u);
 520
 521         if (u->started) {
 522                 user_send_signal(u, false);
 523                 u->started = false;
 524         }
 525
 526         return r;
 527 }
 528
 529 int user_get_idle_hint(User *u, dual_timestamp *t) {
 530         Session *s;
 531         bool idle_hint = true;
 532         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 533
 534         assert(u);
 535
 536         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 537                 dual_timestamp k;
 538                 int ih;
 539
 540                 ih = session_get_idle_hint(s, &k);
 541                 if (ih < 0)
 542                         return ih;
 543
 544                 if (!ih) {
 545                         if (!idle_hint) {
 546                                 if (k.monotonic < ts.monotonic)
 547                                         ts = k;
 548                         } else {
 549                                 idle_hint = false;
 550                                 ts = k;
 551                         }
 552                 } else if (idle_hint) {
 553
 554                         if (k.monotonic > ts.monotonic)
 555                                 ts = k;
 556                 }
 557         }
 558
 559         if (t)
 560                 *t = ts;
 561
 562         return idle_hint;
 563 }
 564
 565 int user_check_linger_file(User *u) {
 566         _cleanup_free_ char *cc = NULL;
 567         char *p = NULL;
 568
 569         cc = cescape(u->name);
 570         if (!cc)
 571                 return -ENOMEM;
 572
 573         p = strjoina("/var/lib/elogind/linger/", cc);
 574
 575         return access(p, F_OK) >= 0;
 576 }
 577
 578 bool user_may_gc(User *u, bool drop_not_started) {
 579         assert(u);
 580
 581         if (drop_not_started && !u->started)
 582                 return true;
 583
 584         if (u->sessions)
 585                 return false;
 586
 587         if (user_check_linger_file(u) > 0)
 588                 return false;
 589
 590 #if 0 /// elogind neither supports service nor slice jobs
 591         if (u->slice_job && manager_job_is_active(u->manager, u->slice_job))
 592                 return false;
 593
 594         if (u->service_job && manager_job_is_active(u->manager, u->service_job))
 595                 return false;
 596 #endif // 0
 597
 598         return true;
 599 }
 600
 601 void user_add_to_gc_queue(User *u) {
 602         assert(u);
 603
 604         if (u->in_gc_queue)
 605                 return;
 606
 607         LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
 608         u->in_gc_queue = true;
 609 }
 610
 611 UserState user_get_state(User *u) {
 612         Session *i;
 613
 614         assert(u);
 615
 616         if (u->stopping)
 617                 return USER_CLOSING;
 618
 619 #if 0 /// elogind neither supports service nor slice jobs.
 620         if (!u->started || u->slice_job || u->service_job)
 621 #else
 622         if (!u->started)
 623 #endif // 0
 624                 return USER_OPENING;
 625
 626         if (u->sessions) {
 627                 bool all_closing = true;
 628
 629                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 630                         SessionState state;
 631
 632                         state = session_get_state(i);
 633                         if (state == SESSION_ACTIVE)
 634                                 return USER_ACTIVE;
 635                         if (state != SESSION_CLOSING)
 636                                 all_closing = false;
 637                 }
 638
 639                 return all_closing ? USER_CLOSING : USER_ONLINE;
 640         }
 641
 642         if (user_check_linger_file(u) > 0)
 643                 return USER_LINGERING;
 644
 645         return USER_CLOSING;
 646 }
 647
 648 int user_kill(User *u, int signo) {
 649 #if 0 /// Without systemd unit support, elogind has to rely on its session system
 650         assert(u);
 651
 652         return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
 653 #else
 654         Session *s;
 655         int res = 0;
 656
 657         assert(u);
 658
 659         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 660                 int r = session_kill(s, KILL_ALL, signo);
 661                 if (res == 0 && r < 0)
 662                         res = r;
 663         }
 664
 665         return res;
 666 #endif // 0
 667 }
 668
 669 static bool elect_display_filter(Session *s) {
 670         /* Return true if the session is a candidate for the user’s ‘primary
 671          * session’ or ‘display’. */
 672         assert(s);
 673
 674         return (s->class == SESSION_USER && !s->stopping);
 675 }
 676
 677 static int elect_display_compare(Session *s1, Session *s2) {
 678         /* Indexed by SessionType. Lower numbers mean more preferred. */
 679         const int type_ranks[_SESSION_TYPE_MAX] = {
 680                 [SESSION_UNSPECIFIED] = 0,
 681                 [SESSION_TTY] = -2,
 682                 [SESSION_X11] = -3,
 683                 [SESSION_WAYLAND] = -3,
 684                 [SESSION_MIR] = -3,
 685                 [SESSION_WEB] = -1,
 686         };
 687
 688         /* Calculate the partial order relationship between s1 and s2,
 689          * returning < 0 if s1 is preferred as the user’s ‘primary session’,
 690          * 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
 691          * is preferred.
 692          *
 693          * s1 or s2 may be NULL. */
 694         if (!s1 && !s2)
 695                 return 0;
 696
 697         if ((s1 == NULL) != (s2 == NULL))
 698                 return (s1 == NULL) - (s2 == NULL);
 699
 700         if (s1->stopping != s2->stopping)
 701                 return s1->stopping - s2->stopping;
 702
 703         if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
 704                 return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
 705
 706         if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
 707                 return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
 708
 709         if (s1->type != s2->type)
 710                 return type_ranks[s1->type] - type_ranks[s2->type];
 711
 712         return 0;
 713 }
 714
 715 void user_elect_display(User *u) {
 716         Session *s;
 717
 718         assert(u);
 719
 720         /* This elects a primary session for each user, which we call
 721          * the "display". We try to keep the assignment stable, but we
 722          * "upgrade" to better choices. */
 723         log_debug("Electing new display for user %s", u->name);
 724
 725         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 726                 if (!elect_display_filter(s)) {
 727                         log_debug("Ignoring session %s", s->id);
 728                         continue;
 729                 }
 730
 731                 if (elect_display_compare(s, u->display) < 0) {
 732                         log_debug("Choosing session %s in preference to %s", s->id, u->display ? u->display->id : "-");
 733                         u->display = s;
 734                 }
 735         }
 736 }
 737
 738 static const char* const user_state_table[_USER_STATE_MAX] = {
 739         [USER_OFFLINE] = "offline",
 740         [USER_OPENING] = "opening",
 741         [USER_LINGERING] = "lingering",
 742         [USER_ONLINE] = "online",
 743         [USER_ACTIVE] = "active",
 744         [USER_CLOSING] = "closing"
 745 };
 746
 747 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
 748
 749 int config_parse_tmpfs_size(
 750                 const char* unit,
 751                 const char *filename,
 752                 unsigned line,
 753                 const char *section,
 754                 unsigned section_line,
 755                 const char *lvalue,
 756                 int ltype,
 757                 const char *rvalue,
 758                 void *data,
 759                 void *userdata) {
 760
 761         size_t *sz = data;
 762         int r;
 763
 764         assert(filename);
 765         assert(lvalue);
 766         assert(rvalue);
 767         assert(data);
 768
 769         /* First, try to parse as percentage */
 770         r = parse_percent(rvalue);
 771         if (r > 0 && r < 100)
 772                 *sz = physical_memory_scale(r, 100U);
 773         else {
 774                 uint64_t k;
 775
 776                 /* If the passed argument was not a percentage, or out of range, parse as byte size */
 777
 778                 r = parse_size(rvalue, 1024, &k);
 779                 if (r < 0 || k <= 0 || (uint64_t) (size_t) k != k) {
 780                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 781                         return 0;
 782                 }
 783
 784                 *sz = PAGE_ALIGN((size_t) k);
 785         }
 786
 787         return 0;
 788 }
 789
 790 int config_parse_compat_user_tasks_max(
 791                 const char *unit,
 792                 const char *filename,
 793                 unsigned line,
 794                 const char *section,
 795                 unsigned section_line,
 796                 const char *lvalue,
 797                 int ltype,
 798                 const char *rvalue,
 799                 void *data,
 800                 void *userdata) {
 801
 802         assert(filename);
 803         assert(lvalue);
 804         assert(rvalue);
 805         assert(data);
 806
 807         log_syntax(unit, LOG_NOTICE, filename, line, 0,
 808                    "Support for option %s= has been removed.",
 809                    lvalue);
 810         log_info("Hint: try creating /etc/elogind/system/user-.slice/50-limits.conf with:\n"
 811                  "        [Slice]\n"
 812                  "        TasksMax=%s",
 813                  rvalue);
 814         return 0;
 815 }