src/login/logind-core.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <sys/ioctl.h>
   5 #include <sys/types.h>
   6 #include <linux/vt.h>
   7
   8 #include "sd-device.h"
   9
  10 #include "alloc-util.h"
  11 #include "bus-error.h"
  12 #include "bus-util.h"
  13 #include "cgroup-util.h"
  14 #include "conf-parser.h"
  15 #include "device-util.h"
  16 #include "efi-loader.h"
  17 #include "errno-util.h"
  18 #include "fd-util.h"
  19 #include "limits-util.h"
  20 #include "logind.h"
  21 #include "parse-util.h"
  22 #include "path-util.h"
  23 #include "process-util.h"
  24 #include "strv.h"
  25 #include "terminal-util.h"
  26 #include "udev-util.h"
  27 #include "user-util.h"
  28 #include "userdb.h"
  29 #include "utmp-wtmp.h"
  30
  31 void manager_reset_config(Manager *m) {
  32         assert(m);
  33
  34         m->n_autovts = 6;
  35         m->reserve_vt = 6;
  36         m->remove_ipc = true;
  37         m->inhibit_delay_max = 5 * USEC_PER_SEC;
  38         m->user_stop_delay = 10 * USEC_PER_SEC;
  39
  40         m->handle_power_key = HANDLE_POWEROFF;
  41         m->handle_suspend_key = HANDLE_SUSPEND;
  42         m->handle_hibernate_key = HANDLE_HIBERNATE;
  43         m->handle_lid_switch = HANDLE_SUSPEND;
  44         m->handle_lid_switch_ep = _HANDLE_ACTION_INVALID;
  45         m->handle_lid_switch_docked = HANDLE_IGNORE;
  46         m->power_key_ignore_inhibited = false;
  47         m->suspend_key_ignore_inhibited = false;
  48         m->hibernate_key_ignore_inhibited = false;
  49         m->lid_switch_ignore_inhibited = true;
  50
  51         m->holdoff_timeout_usec = 30 * USEC_PER_SEC;
  52
  53         m->idle_action_usec = 30 * USEC_PER_MINUTE;
  54         m->idle_action = HANDLE_IGNORE;
  55
  56         m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
  57         m->runtime_dir_inodes = DIV_ROUND_UP(m->runtime_dir_size, 4096); /* 4k per inode */
  58         m->sessions_max = 8192;
  59         m->inhibitors_max = 8192;
  60
  61         m->kill_user_processes = KILL_USER_PROCESSES;
  62
  63         m->kill_only_users = strv_free(m->kill_only_users);
  64         m->kill_exclude_users = strv_free(m->kill_exclude_users);
  65 }
  66
  67 int manager_parse_config_file(Manager *m) {
  68         assert(m);
  69
  70         return config_parse_many_nulstr(
  71                         PKGSYSCONFDIR "/logind.conf",
  72                         CONF_PATHS_NULSTR("systemd/logind.conf.d"),
  73                         "Login\0",
  74                         config_item_perf_lookup, logind_gperf_lookup,
  75                         CONFIG_PARSE_WARN, m,
  76                         NULL);
  77 }
  78
  79 int manager_add_device(Manager *m, const char *sysfs, bool master, Device **ret_device) {
  80         Device *d;
  81
  82         assert(m);
  83         assert(sysfs);
  84
  85         d = hashmap_get(m->devices, sysfs);
  86         if (d)
  87                 /* we support adding master-flags, but not removing them */
  88                 d->master = d->master || master;
  89         else {
  90                 d = device_new(m, sysfs, master);
  91                 if (!d)
  92                         return -ENOMEM;
  93         }
  94
  95         if (ret_device)
  96                 *ret_device = d;
  97
  98         return 0;
  99 }
 100
 101 int manager_add_seat(Manager *m, const char *id, Seat **ret_seat) {
 102         Seat *s;
 103         int r;
 104
 105         assert(m);
 106         assert(id);
 107
 108         s = hashmap_get(m->seats, id);
 109         if (!s) {
 110                 r = seat_new(&s, m, id);
 111                 if (r < 0)
 112                         return r;
 113         }
 114
 115         if (ret_seat)
 116                 *ret_seat = s;
 117
 118         return 0;
 119 }
 120
 121 int manager_add_session(Manager *m, const char *id, Session **ret_session) {
 122         Session *s;
 123         int r;
 124
 125         assert(m);
 126         assert(id);
 127
 128         s = hashmap_get(m->sessions, id);
 129         if (!s) {
 130                 r = session_new(&s, m, id);
 131                 if (r < 0)
 132                         return r;
 133         }
 134
 135         if (ret_session)
 136                 *ret_session = s;
 137
 138         return 0;
 139 }
 140
 141 int manager_add_user(
 142                 Manager *m,
 143                 UserRecord *ur,
 144                 User **ret_user) {
 145
 146         User *u;
 147         int r;
 148
 149         assert(m);
 150         assert(ur);
 151
 152         u = hashmap_get(m->users, UID_TO_PTR(ur->uid));
 153         if (!u) {
 154                 r = user_new(&u, m, ur);
 155                 if (r < 0)
 156                         return r;
 157         }
 158
 159         if (ret_user)
 160                 *ret_user = u;
 161
 162         return 0;
 163 }
 164
 165 int manager_add_user_by_name(
 166                 Manager *m,
 167                 const char *name,
 168                 User **ret_user) {
 169
 170         _cleanup_(user_record_unrefp) UserRecord *ur = NULL;
 171         int r;
 172
 173         assert(m);
 174         assert(name);
 175
 176         r = userdb_by_name(name, USERDB_AVOID_SHADOW, &ur);
 177         if (r < 0)
 178                 return r;
 179
 180         return manager_add_user(m, ur, ret_user);
 181 }
 182
 183 int manager_add_user_by_uid(
 184                 Manager *m,
 185                 uid_t uid,
 186                 User **ret_user) {
 187
 188         _cleanup_(user_record_unrefp) UserRecord *ur = NULL;
 189         int r;
 190
 191         assert(m);
 192         assert(uid_is_valid(uid));
 193
 194         r = userdb_by_uid(uid, USERDB_AVOID_SHADOW, &ur);
 195         if (r < 0)
 196                 return r;
 197
 198         return manager_add_user(m, ur, ret_user);
 199 }
 200
 201 int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **ret) {
 202         Inhibitor *i;
 203         int r;
 204
 205         assert(m);
 206         assert(id);
 207
 208         i = hashmap_get(m->inhibitors, id);
 209         if (!i) {
 210                 r = inhibitor_new(&i, m, id);
 211                 if (r < 0)
 212                         return r;
 213         }
 214
 215         if (ret)
 216                 *ret = i;
 217
 218         return 0;
 219 }
 220
 221 int manager_add_button(Manager *m, const char *name, Button **ret_button) {
 222         Button *b;
 223
 224         assert(m);
 225         assert(name);
 226
 227         b = hashmap_get(m->buttons, name);
 228         if (!b) {
 229                 b = button_new(m, name);
 230                 if (!b)
 231                         return -ENOMEM;
 232         }
 233
 234         if (ret_button)
 235                 *ret_button = b;
 236
 237         return 0;
 238 }
 239
 240 int manager_process_seat_device(Manager *m, sd_device *d) {
 241         Device *device;
 242         int r;
 243
 244         assert(m);
 245
 246         if (device_for_action(d, DEVICE_ACTION_REMOVE) ||
 247             sd_device_has_current_tag(d, "seat") <= 0) {
 248                 const char *syspath;
 249
 250                 r = sd_device_get_syspath(d, &syspath);
 251                 if (r < 0)
 252                         return 0;
 253
 254                 device = hashmap_get(m->devices, syspath);
 255                 if (!device)
 256                         return 0;
 257
 258                 seat_add_to_gc_queue(device->seat);
 259                 device_free(device);
 260
 261         } else {
 262                 const char *sn, *syspath;
 263                 bool master;
 264                 Seat *seat;
 265
 266                 if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn))
 267                         sn = "seat0";
 268
 269                 if (!seat_name_is_valid(sn)) {
 270                         log_device_warning(d, "Device with invalid seat name %s found, ignoring.", sn);
 271                         return 0;
 272                 }
 273
 274                 seat = hashmap_get(m->seats, sn);
 275                 master = sd_device_has_current_tag(d, "master-of-seat") > 0;
 276
 277                 /* Ignore non-master devices for unknown seats */
 278                 if (!master && !seat)
 279                         return 0;
 280
 281                 r = sd_device_get_syspath(d, &syspath);
 282                 if (r < 0)
 283                         return r;
 284
 285                 r = manager_add_device(m, syspath, master, &device);
 286                 if (r < 0)
 287                         return r;
 288
 289                 if (!seat) {
 290                         r = manager_add_seat(m, sn, &seat);
 291                         if (r < 0) {
 292                                 if (!device->seat)
 293                                         device_free(device);
 294
 295                                 return r;
 296                         }
 297                 }
 298
 299                 device_attach(device, seat);
 300                 seat_start(seat);
 301         }
 302
 303         return 0;
 304 }
 305
 306 int manager_process_button_device(Manager *m, sd_device *d) {
 307         const char *sysname;
 308         Button *b;
 309         int r;
 310
 311         assert(m);
 312
 313         r = sd_device_get_sysname(d, &sysname);
 314         if (r < 0)
 315                 return r;
 316
 317         if (device_for_action(d, DEVICE_ACTION_REMOVE) ||
 318             sd_device_has_current_tag(d, "power-switch") <= 0) {
 319
 320                 b = hashmap_get(m->buttons, sysname);
 321                 if (!b)
 322                         return 0;
 323
 324                 button_free(b);
 325
 326         } else {
 327                 const char *sn;
 328
 329                 r = manager_add_button(m, sysname, &b);
 330                 if (r < 0)
 331                         return r;
 332
 333                 if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn))
 334                         sn = "seat0";
 335
 336                 button_set_seat(b, sn);
 337
 338                 r = button_open(b);
 339                 if (r < 0) /* event device doesn't have any keys or switches relevant to us? (or any other error
 340                             * opening the device?) let's close the button again. */
 341                         button_free(b);
 342         }
 343
 344         return 0;
 345 }
 346
 347 int manager_get_session_by_pid(Manager *m, pid_t pid, Session **ret) {
 348         _cleanup_free_ char *unit = NULL;
 349         Session *s;
 350         int r;
 351
 352         assert(m);
 353
 354         if (!pid_is_valid(pid))
 355                 return -EINVAL;
 356
 357         s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(pid));
 358         if (!s) {
 359                 r = cg_pid_get_unit(pid, &unit);
 360                 if (r >= 0)
 361                         s = hashmap_get(m->session_units, unit);
 362         }
 363
 364         if (ret)
 365                 *ret = s;
 366
 367         return !!s;
 368 }
 369
 370 int manager_get_user_by_pid(Manager *m, pid_t pid, User **ret) {
 371         _cleanup_free_ char *unit = NULL;
 372         User *u = NULL;
 373         int r;
 374
 375         assert(m);
 376
 377         if (!pid_is_valid(pid))
 378                 return -EINVAL;
 379
 380         r = cg_pid_get_slice(pid, &unit);
 381         if (r >= 0)
 382                 u = hashmap_get(m->user_units, unit);
 383
 384         if (ret)
 385                 *ret = u;
 386
 387         return !!u;
 388 }
 389
 390 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
 391         Session *s;
 392         bool idle_hint;
 393         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 394
 395         assert(m);
 396
 397         idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0, NULL);
 398
 399         HASHMAP_FOREACH(s, m->sessions) {
 400                 dual_timestamp k;
 401                 int ih;
 402
 403                 ih = session_get_idle_hint(s, &k);
 404                 if (ih < 0)
 405                         return ih;
 406
 407                 if (!ih) {
 408                         if (!idle_hint) {
 409                                 if (k.monotonic < ts.monotonic)
 410                                         ts = k;
 411                         } else {
 412                                 idle_hint = false;
 413                                 ts = k;
 414                         }
 415                 } else if (idle_hint) {
 416
 417                         if (k.monotonic > ts.monotonic)
 418                                 ts = k;
 419                 }
 420         }
 421
 422         if (t)
 423                 *t = ts;
 424
 425         return idle_hint;
 426 }
 427
 428 bool manager_shall_kill(Manager *m, const char *user) {
 429         assert(m);
 430         assert(user);
 431
 432         if (!m->kill_exclude_users && streq(user, "root"))
 433                 return false;
 434
 435         if (strv_contains(m->kill_exclude_users, user))
 436                 return false;
 437
 438         if (!strv_isempty(m->kill_only_users))
 439                 return strv_contains(m->kill_only_users, user);
 440
 441         return m->kill_user_processes;
 442 }
 443
 444 int config_parse_n_autovts(
 445                 const char *unit,
 446                 const char *filename,
 447                 unsigned line,
 448                 const char *section,
 449                 unsigned section_line,
 450                 const char *lvalue,
 451                 int ltype,
 452                 const char *rvalue,
 453                 void *data,
 454                 void *userdata) {
 455
 456         unsigned *n = data;
 457         unsigned o;
 458         int r;
 459
 460         assert(filename);
 461         assert(lvalue);
 462         assert(rvalue);
 463         assert(data);
 464
 465         r = safe_atou(rvalue, &o);
 466         if (r < 0) {
 467                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse number of autovts, ignoring: %s", rvalue);
 468                 return 0;
 469         }
 470
 471         if (o > 15) {
 472                 log_syntax(unit, LOG_ERR, filename, line, r, "A maximum of 15 autovts are supported, ignoring: %s", rvalue);
 473                 return 0;
 474         }
 475
 476         *n = o;
 477         return 0;
 478 }
 479
 480 static int vt_is_busy(unsigned vtnr) {
 481         struct vt_stat vt_stat;
 482         int r;
 483         _cleanup_close_ int fd;
 484
 485         assert(vtnr >= 1);
 486
 487         /* VT_GETSTATE "cannot return state for more than 16 VTs, since v_state is short" */
 488         assert(vtnr <= 15);
 489
 490         /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
 491          * we'd open the latter we'd open the foreground tty which
 492          * hence would be unconditionally busy. By opening /dev/tty1
 493          * we avoid this. Since tty1 is special and needs to be an
 494          * explicitly loaded getty or DM this is safe. */
 495
 496         fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
 497         if (fd < 0)
 498                 return -errno;
 499
 500         if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
 501                 r = -errno;
 502         else
 503                 r = !!(vt_stat.v_state & (1 << vtnr));
 504
 505         return r;
 506 }
 507
 508 int manager_spawn_autovt(Manager *m, unsigned vtnr) {
 509         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 510         char name[sizeof("autovt@tty.service") + DECIMAL_STR_MAX(unsigned)];
 511         int r;
 512
 513         assert(m);
 514         assert(vtnr >= 1);
 515
 516         if (vtnr > m->n_autovts &&
 517             vtnr != m->reserve_vt)
 518                 return 0;
 519
 520         if (vtnr != m->reserve_vt) {
 521                 /* If this is the reserved TTY, we'll start the getty
 522                  * on it in any case, but otherwise only if it is not
 523                  * busy. */
 524
 525                 r = vt_is_busy(vtnr);
 526                 if (r < 0)
 527                         return r;
 528                 else if (r > 0)
 529                         return -EBUSY;
 530         }
 531
 532         snprintf(name, sizeof(name), "autovt@tty%u.service", vtnr);
 533         r = sd_bus_call_method(
 534                         m->bus,
 535                         "org.freedesktop.systemd1",
 536                         "/org/freedesktop/systemd1",
 537                         "org.freedesktop.systemd1.Manager",
 538                         "StartUnit",
 539                         &error,
 540                         NULL,
 541                         "ss", name, "fail");
 542         if (r < 0)
 543                 return log_error_errno(r, "Failed to start %s: %s", name, bus_error_message(&error, r));
 544
 545         return 0;
 546 }
 547
 548 bool manager_is_lid_closed(Manager *m) {
 549         Button *b;
 550
 551         HASHMAP_FOREACH(b, m->buttons)
 552                 if (b->lid_closed)
 553                         return true;
 554
 555         return false;
 556 }
 557
 558 static bool manager_is_docked(Manager *m) {
 559         Button *b;
 560
 561         HASHMAP_FOREACH(b, m->buttons)
 562                 if (b->docked)
 563                         return true;
 564
 565         return false;
 566 }
 567
 568 static int manager_count_external_displays(Manager *m) {
 569         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 570         sd_device *d;
 571         int r, n = 0;
 572
 573         r = sd_device_enumerator_new(&e);
 574         if (r < 0)
 575                 return r;
 576
 577         r = sd_device_enumerator_allow_uninitialized(e);
 578         if (r < 0)
 579                 return r;
 580
 581         r = sd_device_enumerator_add_match_subsystem(e, "drm", true);
 582         if (r < 0)
 583                 return r;
 584
 585         FOREACH_DEVICE(e, d) {
 586                 const char *status, *enabled, *dash, *nn, *subsys;
 587                 sd_device *p;
 588
 589                 if (sd_device_get_parent(d, &p) < 0)
 590                         continue;
 591
 592                 /* If the parent shares the same subsystem as the
 593                  * device we are looking at then it is a connector,
 594                  * which is what we are interested in. */
 595                 if (sd_device_get_subsystem(p, &subsys) < 0 || !streq(subsys, "drm"))
 596                         continue;
 597
 598                 if (sd_device_get_sysname(d, &nn) < 0)
 599                         continue;
 600
 601                 /* Ignore internal displays: the type is encoded in the sysfs name, as the second dash
 602                  * separated item (the first is the card name, the last the connector number). We implement a
 603                  * deny list of external displays here, rather than an allow list of internal ones, to ensure
 604                  * we don't block suspends too eagerly. */
 605                 dash = strchr(nn, '-');
 606                 if (!dash)
 607                         continue;
 608
 609                 dash++;
 610                 if (!STARTSWITH_SET(dash,
 611                                     "VGA-", "DVI-I-", "DVI-D-", "DVI-A-"
 612                                     "Composite-", "SVIDEO-", "Component-",
 613                                     "DIN-", "DP-", "HDMI-A-", "HDMI-B-", "TV-"))
 614                         continue;
 615
 616                 /* Ignore ports that are not enabled */
 617                 if (sd_device_get_sysattr_value(d, "enabled", &enabled) < 0 || !streq(enabled, "enabled"))
 618                         continue;
 619
 620                 /* We count any connector which is not explicitly
 621                  * "disconnected" as connected. */
 622                 if (sd_device_get_sysattr_value(d, "status", &status) < 0 || !streq(status, "disconnected"))
 623                         n++;
 624         }
 625
 626         return n;
 627 }
 628
 629 bool manager_is_docked_or_external_displays(Manager *m) {
 630         int n;
 631
 632         /* If we are docked don't react to lid closing */
 633         if (manager_is_docked(m)) {
 634                 log_debug("System is docked.");
 635                 return true;
 636         }
 637
 638         /* If we have more than one display connected,
 639          * assume that we are docked. */
 640         n = manager_count_external_displays(m);
 641         if (n < 0)
 642                 log_warning_errno(n, "Display counting failed: %m");
 643         else if (n >= 1) {
 644                 log_debug("External (%i) displays connected.", n);
 645                 return true;
 646         }
 647
 648         return false;
 649 }
 650
 651 bool manager_is_on_external_power(void) {
 652         int r;
 653
 654         /* For now we only check for AC power, but 'external power' can apply to anything that isn't an internal
 655          * battery */
 656         r = on_ac_power();
 657         if (r < 0)
 658                 log_warning_errno(r, "Failed to read AC power status: %m");
 659
 660         return r != 0; /* Treat failure as 'on AC' */
 661 }
 662
 663 bool manager_all_buttons_ignored(Manager *m) {
 664         assert(m);
 665
 666         if (m->handle_power_key != HANDLE_IGNORE)
 667                 return false;
 668         if (m->handle_suspend_key != HANDLE_IGNORE)
 669                 return false;
 670         if (m->handle_hibernate_key != HANDLE_IGNORE)
 671                 return false;
 672         if (m->handle_lid_switch != HANDLE_IGNORE)
 673                 return false;
 674         if (!IN_SET(m->handle_lid_switch_ep, _HANDLE_ACTION_INVALID, HANDLE_IGNORE))
 675                 return false;
 676         if (m->handle_lid_switch_docked != HANDLE_IGNORE)
 677                 return false;
 678
 679         return true;
 680 }
 681
 682 int manager_read_utmp(Manager *m) {
 683 #if ENABLE_UTMP
 684         int r;
 685         _cleanup_(utxent_cleanup) bool utmpx = false;
 686
 687         assert(m);
 688
 689         if (utmpxname(_PATH_UTMPX) < 0)
 690                 return log_error_errno(errno, "Failed to set utmp path to " _PATH_UTMPX ": %m");
 691
 692         utmpx = utxent_start();
 693
 694         for (;;) {
 695                 _cleanup_free_ char *t = NULL;
 696                 struct utmpx *u;
 697                 const char *c;
 698                 Session *s;
 699
 700                 errno = 0;
 701                 u = getutxent();
 702                 if (!u) {
 703                         if (errno != 0)
 704                                 log_warning_errno(errno, "Failed to read " _PATH_UTMPX ", ignoring: %m");
 705                         return 0;
 706                 }
 707
 708                 if (u->ut_type != USER_PROCESS)
 709                         continue;
 710
 711                 if (!pid_is_valid(u->ut_pid))
 712                         continue;
 713
 714                 t = strndup(u->ut_line, sizeof(u->ut_line));
 715                 if (!t)
 716                         return log_oom();
 717
 718                 c = path_startswith(t, "/dev/");
 719                 if (c) {
 720                         r = free_and_strdup(&t, c);
 721                         if (r < 0)
 722                                 return log_oom();
 723                 }
 724
 725                 if (isempty(t))
 726                         continue;
 727
 728                 s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(u->ut_pid));
 729                 if (!s)
 730                         continue;
 731
 732                 if (s->tty_validity == TTY_FROM_UTMP && !streq_ptr(s->tty, t)) {
 733                         /* This may happen on multiplexed SSH connection (i.e. 'SSH connection sharing'). In
 734                          * this case PAM and utmp sessions don't match. In such a case let's invalidate the TTY
 735                          * information and never acquire it again. */
 736
 737                         s->tty = mfree(s->tty);
 738                         s->tty_validity = TTY_UTMP_INCONSISTENT;
 739                         log_debug("Session '%s' has inconsistent TTY information, dropping TTY information.", s->id);
 740                         continue;
 741                 }
 742
 743                 /* Never override what we figured out once */
 744                 if (s->tty || s->tty_validity >= 0)
 745                         continue;
 746
 747                 s->tty = TAKE_PTR(t);
 748                 s->tty_validity = TTY_FROM_UTMP;
 749                 log_debug("Acquired TTY information '%s' from utmp for session '%s'.", s->tty, s->id);
 750         }
 751
 752 #else
 753         return 0;
 754 #endif
 755 }
 756
 757 #if ENABLE_UTMP
 758 static int manager_dispatch_utmp(sd_event_source *s, const struct inotify_event *event, void *userdata) {
 759         Manager *m = userdata;
 760
 761         assert(m);
 762
 763         /* If there's indication the file itself might have been removed or became otherwise unavailable, then let's
 764          * reestablish the watch on whatever there's now. */
 765         if ((event->mask & (IN_ATTRIB|IN_DELETE_SELF|IN_MOVE_SELF|IN_Q_OVERFLOW|IN_UNMOUNT)) != 0)
 766                 manager_connect_utmp(m);
 767
 768         (void) manager_read_utmp(m);
 769         return 0;
 770 }
 771 #endif
 772
 773 void manager_connect_utmp(Manager *m) {
 774 #if ENABLE_UTMP
 775         sd_event_source *s = NULL;
 776         int r;
 777
 778         assert(m);
 779
 780         /* Watch utmp for changes via inotify. We do this to deal with tools such as ssh, which will register the PAM
 781          * session early, and acquire a TTY only much later for the connection. Thus during PAM the TTY won't be known
 782          * yet. ssh will register itself with utmp when it finally acquired the TTY. Hence, let's make use of this, and
 783          * watch utmp for the TTY asynchronously. We use the PAM session's leader PID as key, to find the right entry.
 784          *
 785          * Yes, relying on utmp is pretty ugly, but it's good enough for informational purposes, as well as idle
 786          * detection (which, for tty sessions, relies on the TTY used) */
 787
 788         r = sd_event_add_inotify(m->event, &s, _PATH_UTMPX, IN_MODIFY|IN_MOVE_SELF|IN_DELETE_SELF|IN_ATTRIB, manager_dispatch_utmp, m);
 789         if (r < 0)
 790                 log_full_errno(r == -ENOENT ? LOG_DEBUG: LOG_WARNING, r, "Failed to create inotify watch on " _PATH_UTMPX ", ignoring: %m");
 791         else {
 792                 r = sd_event_source_set_priority(s, SD_EVENT_PRIORITY_IDLE);
 793                 if (r < 0)
 794                         log_warning_errno(r, "Failed to adjust utmp event source priority, ignoring: %m");
 795
 796                 (void) sd_event_source_set_description(s, "utmp");
 797         }
 798
 799         sd_event_source_unref(m->utmp_event_source);
 800         m->utmp_event_source = s;
 801 #endif
 802 }
 803
 804 void manager_reconnect_utmp(Manager *m) {
 805 #if ENABLE_UTMP
 806         assert(m);
 807
 808         if (m->utmp_event_source)
 809                 return;
 810
 811         manager_connect_utmp(m);
 812 #endif
 813 }
 814
 815 int manager_read_efi_boot_loader_entries(Manager *m) {
 816 #if ENABLE_EFI
 817         int r;
 818
 819         assert(m);
 820         if (m->efi_boot_loader_entries_set)
 821                 return 0;
 822
 823         r = efi_loader_get_entries(&m->efi_boot_loader_entries);
 824         if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r)) {
 825                 log_debug_errno(r, "Boot loader reported no entries.");
 826                 m->efi_boot_loader_entries_set = true;
 827                 return 0;
 828         }
 829         if (r < 0)
 830                 return log_error_errno(r, "Failed to determine entries reported by boot loader: %m");
 831
 832         m->efi_boot_loader_entries_set = true;
 833         return 1;
 834 #else
 835         return 0;
 836 #endif
 837 }