forked from systemd/systemd-stable
-
Notifications
You must be signed in to change notification settings - Fork 0
/
logind.c
1206 lines (914 loc) · 38.3 KB
/
logind.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include "sd-daemon.h"
#include "sd-device.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-log-control-api.h"
#include "bus-polkit.h"
#include "cgroup-util.h"
#include "daemon-util.h"
#include "def.h"
#include "device-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "logind-dbus.h"
#include "logind-seat-dbus.h"
#include "logind-session-dbus.h"
#include "logind-user-dbus.h"
#include "logind.h"
#include "main-func.h"
#include "mkdir-label.h"
#include "parse-util.h"
#include "process-util.h"
#include "selinux-util.h"
#include "service-util.h"
#include "signal-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "udev-util.h"
#include "user-util.h"
static Manager* manager_unref(Manager *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref);
static int manager_new(Manager **ret) {
_cleanup_(manager_unrefp) Manager *m = NULL;
int r;
assert(ret);
m = new(Manager, 1);
if (!m)
return -ENOMEM;
*m = (Manager) {
.console_active_fd = -1,
.reserve_vt_fd = -1,
.idle_action_not_before_usec = now(CLOCK_MONOTONIC),
};
m->devices = hashmap_new(&string_hash_ops);
m->seats = hashmap_new(&string_hash_ops);
m->sessions = hashmap_new(&string_hash_ops);
m->sessions_by_leader = hashmap_new(NULL);
m->users = hashmap_new(NULL);
m->inhibitors = hashmap_new(&string_hash_ops);
m->buttons = hashmap_new(&string_hash_ops);
m->user_units = hashmap_new(&string_hash_ops);
m->session_units = hashmap_new(&string_hash_ops);
if (!m->devices || !m->seats || !m->sessions || !m->sessions_by_leader || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
return -ENOMEM;
r = sd_event_default(&m->event);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
if (r < 0)
return r;
(void) sd_event_set_watchdog(m->event, true);
manager_reset_config(m);
*ret = TAKE_PTR(m);
return 0;
}
static Manager* manager_unref(Manager *m) {
Session *session;
User *u;
Device *d;
Seat *s;
Inhibitor *i;
Button *b;
if (!m)
return NULL;
while ((session = hashmap_first(m->sessions)))
session_free(session);
while ((u = hashmap_first(m->users)))
user_free(u);
while ((d = hashmap_first(m->devices)))
device_free(d);
while ((s = hashmap_first(m->seats)))
seat_free(s);
while ((i = hashmap_first(m->inhibitors)))
inhibitor_free(i);
while ((b = hashmap_first(m->buttons)))
button_free(b);
hashmap_free(m->devices);
hashmap_free(m->seats);
hashmap_free(m->sessions);
hashmap_free(m->sessions_by_leader);
hashmap_free(m->users);
hashmap_free(m->inhibitors);
hashmap_free(m->buttons);
hashmap_free(m->brightness_writers);
hashmap_free(m->user_units);
hashmap_free(m->session_units);
sd_event_source_unref(m->idle_action_event_source);
sd_event_source_unref(m->inhibit_timeout_source);
sd_event_source_unref(m->scheduled_shutdown_timeout_source);
sd_event_source_unref(m->nologin_timeout_source);
sd_event_source_unref(m->wall_message_timeout_source);
sd_event_source_unref(m->console_active_event_source);
sd_event_source_unref(m->lid_switch_ignore_event_source);
sd_event_source_unref(m->reboot_key_long_press_event_source);
#if ENABLE_UTMP
sd_event_source_unref(m->utmp_event_source);
#endif
safe_close(m->console_active_fd);
sd_device_monitor_unref(m->device_seat_monitor);
sd_device_monitor_unref(m->device_monitor);
sd_device_monitor_unref(m->device_vcsa_monitor);
sd_device_monitor_unref(m->device_button_monitor);
if (m->unlink_nologin)
(void) unlink_or_warn("/run/nologin");
bus_verify_polkit_async_registry_free(m->polkit_registry);
sd_bus_flush_close_unref(m->bus);
sd_event_unref(m->event);
safe_close(m->reserve_vt_fd);
strv_free(m->kill_only_users);
strv_free(m->kill_exclude_users);
free(m->scheduled_shutdown_type);
free(m->scheduled_shutdown_tty);
free(m->wall_message);
free(m->action_job);
strv_free(m->efi_boot_loader_entries);
free(m->efi_loader_entry_one_shot);
return mfree(m);
}
static int manager_enumerate_devices(Manager *m) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
sd_device *d;
int r;
assert(m);
/* Loads devices from udev and creates seats for them as
* necessary */
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_tag(e, "master-of-seat");
if (r < 0)
return r;
FOREACH_DEVICE(e, d) {
int k;
k = manager_process_seat_device(m, d);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_buttons(Manager *m) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
sd_device *d;
int r;
assert(m);
/* Loads buttons from udev */
if (manager_all_buttons_ignored(m))
return 0;
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_subsystem(e, "input", true);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_tag(e, "power-switch");
if (r < 0)
return r;
FOREACH_DEVICE(e, d) {
int k;
k = manager_process_button_device(m, d);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_seats(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
/* This loads data about seats stored on disk, but does not
* actually create any seats. Removes data of seats that no
* longer exist. */
d = opendir("/run/systemd/seats");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/seats: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
Seat *s;
int k;
if (!dirent_is_file(de))
continue;
s = hashmap_get(m->seats, de->d_name);
if (!s) {
if (unlinkat(dirfd(d), de->d_name, 0) < 0)
log_warning_errno(errno, "Failed to remove /run/systemd/seats/%s, ignoring: %m",
de->d_name);
continue;
}
k = seat_load(s);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_linger_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
d = opendir("/var/lib/systemd/linger");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
int k;
if (!dirent_is_file(de))
continue;
k = manager_add_user_by_name(m, de->d_name, NULL);
if (k < 0)
r = log_warning_errno(k, "Couldn't add lingering user %s, ignoring: %m", de->d_name);
}
return r;
}
static int manager_enumerate_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r, k;
assert(m);
/* Add lingering users */
r = manager_enumerate_linger_users(m);
/* Read in user data stored on disk */
d = opendir("/run/systemd/users");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/users: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
User *u;
uid_t uid;
if (!dirent_is_file(de))
continue;
k = parse_uid(de->d_name, &uid);
if (k < 0) {
r = log_warning_errno(k, "Failed to parse filename /run/systemd/users/%s as UID.", de->d_name);
continue;
}
k = manager_add_user_by_uid(m, uid, &u);
if (k < 0) {
r = log_warning_errno(k, "Failed to add user by file name %s, ignoring: %m", de->d_name);
continue;
}
user_add_to_gc_queue(u);
k = user_load(u);
if (k < 0)
r = k;
}
return r;
}
static int parse_fdname(const char *fdname, char **session_id, dev_t *dev) {
_cleanup_strv_free_ char **parts = NULL;
_cleanup_free_ char *id = NULL;
unsigned major, minor;
int r;
parts = strv_split(fdname, "-");
if (!parts)
return -ENOMEM;
if (strv_length(parts) != 5)
return -EINVAL;
if (!streq(parts[0], "session"))
return -EINVAL;
id = strdup(parts[1]);
if (!id)
return -ENOMEM;
if (!streq(parts[2], "device"))
return -EINVAL;
r = safe_atou(parts[3], &major);
if (r < 0)
return r;
r = safe_atou(parts[4], &minor);
if (r < 0)
return r;
*dev = makedev(major, minor);
*session_id = TAKE_PTR(id);
return 0;
}
static int deliver_fd(Manager *m, const char *fdname, int fd) {
_cleanup_free_ char *id = NULL;
SessionDevice *sd;
struct stat st;
Session *s;
dev_t dev;
int r;
assert(m);
assert(fd >= 0);
r = parse_fdname(fdname, &id, &dev);
if (r < 0)
return log_debug_errno(r, "Failed to parse fd name %s: %m", fdname);
s = hashmap_get(m->sessions, id);
if (!s)
/* If the session doesn't exist anymore, the associated session device attached to this fd
* doesn't either. Let's simply close this fd. */
return log_debug_errno(SYNTHETIC_ERRNO(ENXIO), "Failed to attach fd for unknown session: %s", id);
if (fstat(fd, &st) < 0)
/* The device is allowed to go away at a random point, in which case fstat() failing is
* expected. */
return log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id);
if (!S_ISCHR(st.st_mode) || st.st_rdev != dev)
return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "Device fd doesn't point to the expected character device node");
sd = hashmap_get(s->devices, &dev);
if (!sd)
/* Weird, we got an fd for a session device which wasn't recorded in the session state
* file... */
return log_warning_errno(SYNTHETIC_ERRNO(ENODEV), "Got fd for missing session device [%u:%u] in session %s",
major(dev), minor(dev), s->id);
log_debug("Attaching fd to session device [%u:%u] for session %s",
major(dev), minor(dev), s->id);
session_device_attach_fd(sd, fd, s->was_active);
return 0;
}
static int manager_attach_fds(Manager *m) {
_cleanup_strv_free_ char **fdnames = NULL;
int r, n;
/* Upon restart, PID1 will send us back all fds of session devices that we previously opened. Each
* file descriptor is associated with a given session. The session ids are passed through FDNAMES. */
n = sd_listen_fds_with_names(true, &fdnames);
if (n < 0)
return log_warning_errno(n, "Failed to acquire passed fd list: %m");
if (n == 0)
return 0;
for (int i = 0; i < n; i++) {
int fd = SD_LISTEN_FDS_START + i;
if (deliver_fd(m, fdnames[i], fd) >= 0)
continue;
/* Hmm, we couldn't deliver the fd to any session device object? If so, let's close the fd */
safe_close(fd);
/* Remove from fdstore as well */
r = sd_notifyf(false,
"FDSTOREREMOVE=1\n"
"FDNAME=%s", fdnames[i]);
if (r < 0)
log_warning_errno(r, "Failed to remove file descriptor from the store, ignoring: %m");
}
return 0;
}
static int manager_enumerate_sessions(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0, k;
assert(m);
/* Read in session data stored on disk */
d = opendir("/run/systemd/sessions");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
struct Session *s;
if (!dirent_is_file(de))
continue;
k = manager_add_session(m, de->d_name, &s);
if (k < 0) {
r = log_warning_errno(k, "Failed to add session by file name %s, ignoring: %m", de->d_name);
continue;
}
session_add_to_gc_queue(s);
k = session_load(s);
if (k < 0)
r = k;
}
/* We might be restarted and PID1 could have sent us back the session device fds we previously
* saved. */
(void) manager_attach_fds(m);
return r;
}
static int manager_enumerate_inhibitors(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
d = opendir("/run/systemd/inhibit");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
int k;
Inhibitor *i;
if (!dirent_is_file(de))
continue;
k = manager_add_inhibitor(m, de->d_name, &i);
if (k < 0) {
r = log_warning_errno(k, "Couldn't add inhibitor %s, ignoring: %m", de->d_name);
continue;
}
k = inhibitor_load(i);
if (k < 0)
r = k;
}
return r;
}
static int manager_dispatch_seat_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = userdata;
assert(m);
assert(device);
manager_process_seat_device(m, device);
return 0;
}
static int manager_dispatch_device_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = userdata;
assert(m);
assert(device);
manager_process_seat_device(m, device);
return 0;
}
static int manager_dispatch_vcsa_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = userdata;
const char *name;
assert(m);
assert(device);
/* Whenever a VCSA device is removed try to reallocate our
* VTs, to make sure our auto VTs never go away. */
if (sd_device_get_sysname(device, &name) >= 0 &&
startswith(name, "vcsa") &&
device_for_action(device, SD_DEVICE_REMOVE))
seat_preallocate_vts(m->seat0);
return 0;
}
static int manager_dispatch_button_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = userdata;
assert(m);
assert(device);
manager_process_button_device(m, device);
return 0;
}
static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
Manager *m = userdata;
assert(m);
assert(m->seat0);
assert(m->console_active_fd == fd);
seat_read_active_vt(m->seat0);
return 0;
}
static int manager_reserve_vt(Manager *m) {
_cleanup_free_ char *p = NULL;
assert(m);
if (m->reserve_vt <= 0)
return 0;
if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
return log_oom();
m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (m->reserve_vt_fd < 0) {
/* Don't complain on VT-less systems */
if (errno != ENOENT)
log_warning_errno(errno, "Failed to pin reserved VT: %m");
return -errno;
}
return 0;
}
static int manager_connect_bus(Manager *m) {
int r;
assert(m);
assert(!m->bus);
r = sd_bus_default_system(&m->bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = bus_add_implementation(m->bus, &manager_object, m);
if (r < 0)
return r;
r = bus_log_control_api_register(m->bus);
if (r < 0)
return r;
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "JobRemoved", match_job_removed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for JobRemoved: %m");
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "UnitRemoved", match_unit_removed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
r = sd_bus_match_signal_async(
m->bus,
NULL,
"org.freedesktop.systemd1",
NULL,
"org.freedesktop.DBus.Properties",
"PropertiesChanged",
match_properties_changed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "Reloading", match_reloading, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for Reloading: %m");
r = bus_call_method_async(m->bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to enable subscription: %m");
r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to request name: %m");
r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_error_errno(r, "Failed to attach bus to event loop: %m");
return 0;
}
static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
Manager *m = data;
Session *active, *iter;
/*
* We got a VT-switch signal and we have to acknowledge it immediately.
* Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
* old user-space might run multiple sessions on a single VT, *sigh*.
* Therefore, we have to iterate all sessions and find one with a vtfd
* on the requested VT.
* As only VTs with active controllers have VT_PROCESS set, our current
* notion of the active VT might be wrong (for instance if the switch
* happens while we setup VT_PROCESS). Therefore, read the current VT
* first and then use s->active->vtnr as reference. Note that this is
* not racy, as no further VT-switch can happen as long as we're in
* synchronous VT_PROCESS mode.
*/
assert(m->seat0);
seat_read_active_vt(m->seat0);
active = m->seat0->active;
if (!active || active->vtnr < 1) {
_cleanup_close_ int fd = -1;
int r;
/* We are requested to acknowledge the VT-switch signal by the kernel but
* there's no registered sessions for the current VT. Normally this
* shouldn't happen but something wrong might have happened when we tried
* to release the VT. Better be safe than sorry, and try to release the VT
* one more time otherwise the user will be locked with the current VT. */
log_warning("Received VT_PROCESS signal without a registered session, restoring VT.");
/* At this point we only have the kernel mapping for referring to the
* current VT. */
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0) {
log_warning_errno(fd, "Failed to open, ignoring: %m");
return 0;
}
r = vt_release(fd, true);
if (r < 0)
log_warning_errno(r, "Failed to release VT, ignoring: %m");
return 0;
}
if (active->vtfd >= 0) {
session_leave_vt(active);
} else {
LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) {
if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
session_leave_vt(iter);
break;
}
}
}
return 0;
}
static int manager_connect_console(Manager *m) {
int r;
assert(m);
assert(m->console_active_fd < 0);
/* On certain systems (such as S390, Xen, and containers) /dev/tty0 does not exist (as there is no VC), so
* don't fail if we can't open it. */
if (access("/dev/tty0", F_OK) < 0)
return 0;
m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (m->console_active_fd < 0) {
/* On some systems /dev/tty0 may exist even though /sys/class/tty/tty0 does not. These are broken, but
* common. Let's complain but continue anyway. */
if (errno == ENOENT) {
log_warning_errno(errno, "System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: %m");
return 0;
}
return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
}
r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
if (r < 0)
return log_error_errno(r, "Failed to watch foreground console: %m");
/*
* SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
* as VT-acquire signal. We ignore any acquire-events (yes, we still
* have to provide a valid signal-number for it!) and acknowledge all
* release events immediately.
*/
if (SIGRTMIN + 1 > SIGRTMAX)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Not enough real-time signals available: %u-%u",
SIGRTMIN, SIGRTMAX);
assert_se(ignore_signals(SIGRTMIN + 1) >= 0);
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0);
r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
if (r < 0)
return log_error_errno(r, "Failed to subscribe to signal: %m");
return 0;
}
static int manager_connect_udev(Manager *m) {
int r;
assert(m);
assert(!m->device_seat_monitor);
assert(!m->device_monitor);
assert(!m->device_vcsa_monitor);
assert(!m->device_button_monitor);
r = sd_device_monitor_new(&m->device_seat_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_tag(m->device_seat_monitor, "master-of-seat");
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_seat_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_seat_monitor, manager_dispatch_seat_udev, m);
if (r < 0)
return r;
(void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_seat_monitor), "logind-seat-monitor");
r = sd_device_monitor_new(&m->device_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "input", NULL);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "graphics", NULL);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "drm", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_monitor, manager_dispatch_device_udev, m);
if (r < 0)
return r;
(void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_monitor), "logind-device-monitor");
/* Don't watch keys if nobody cares */
if (!manager_all_buttons_ignored(m)) {
r = sd_device_monitor_new(&m->device_button_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_tag(m->device_button_monitor, "power-switch");
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_button_monitor, "input", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_button_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_button_monitor, manager_dispatch_button_udev, m);
if (r < 0)
return r;
(void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_button_monitor), "logind-button-monitor");
}
/* Don't bother watching VCSA devices, if nobody cares */
if (m->n_autovts > 0 && m->console_active_fd >= 0) {
r = sd_device_monitor_new(&m->device_vcsa_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_vcsa_monitor, "vc", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_vcsa_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_vcsa_monitor, manager_dispatch_vcsa_udev, m);
if (r < 0)
return r;
(void) sd_event_source_set_description(sd_device_monitor_get_event_source(m->device_vcsa_monitor), "logind-vcsa-monitor");
}
return 0;
}
static void manager_gc(Manager *m, bool drop_not_started) {
Seat *seat;
Session *session;
User *user;
assert(m);
while ((seat = m->seat_gc_queue)) {
LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
seat->in_gc_queue = false;
if (seat_may_gc(seat, drop_not_started)) {
seat_stop(seat, /* force = */ false);
seat_free(seat);
}
}
while ((session = m->session_gc_queue)) {
LIST_REMOVE(gc_queue, m->session_gc_queue, session);
session->in_gc_queue = false;
/* First, if we are not closing yet, initiate stopping. */
if (session_may_gc(session, drop_not_started) &&
session_get_state(session) != SESSION_CLOSING)
(void) session_stop(session, /* force = */ false);
/* Normally, this should make the session referenced again, if it doesn't then let's get rid
* of it immediately. */
if (session_may_gc(session, drop_not_started)) {
(void) session_finalize(session);
session_free(session);
}
}
while ((user = m->user_gc_queue)) {
LIST_REMOVE(gc_queue, m->user_gc_queue, user);
user->in_gc_queue = false;
/* First step: queue stop jobs */
if (user_may_gc(user, drop_not_started))
(void) user_stop(user, false);
/* Second step: finalize user */
if (user_may_gc(user, drop_not_started)) {
(void) user_finalize(user);
user_free(user);
}
}
}
static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
Manager *m = userdata;
struct dual_timestamp since;
usec_t n, elapse;
int r;
assert(m);
if (m->idle_action == HANDLE_IGNORE ||
m->idle_action_usec <= 0)
return 0;
n = now(CLOCK_MONOTONIC);
r = manager_get_idle_hint(m, &since);
if (r <= 0)
/* Not idle. Let's check if after a timeout it might be idle then. */
elapse = n + m->idle_action_usec;
else {
/* Idle! Let's see if it's time to do something, or if
* we shall sleep for longer. */
if (n >= since.monotonic + m->idle_action_usec &&
(m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
log_info("System idle. Doing %s operation.", handle_action_to_string(m->idle_action));
manager_handle_action(m, 0, m->idle_action, false, false);
m->idle_action_not_before_usec = n;
}
elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
}
if (!m->idle_action_event_source) {
r = sd_event_add_time(
m->event,
&m->idle_action_event_source,
CLOCK_MONOTONIC,
elapse, USEC_PER_SEC*30,
manager_dispatch_idle_action, m);
if (r < 0)
return log_error_errno(r, "Failed to add idle event source: %m");