src/login/logind-user.c

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