1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
12 #include "sd-messages.h"
14 #include "alloc-util.h"
15 #include "audit-util.h"
16 #include "bus-error.h"
22 #include "format-util.h"
24 #include "logind-dbus.h"
25 #include "logind-seat-dbus.h"
26 #include "logind-session-dbus.h"
27 #include "logind-session.h"
28 #include "logind-user-dbus.h"
30 #include "parse-util.h"
31 #include "path-util.h"
32 #include "process-util.h"
33 #include "serialize.h"
34 #include "string-table.h"
36 #include "terminal-util.h"
37 #include "tmpfile-util.h"
38 #include "user-util.h"
41 #define RELEASE_USEC (20*USEC_PER_SEC)
43 static void session_remove_fifo(Session
*s
);
44 static void session_restore_vt(Session
*s
);
46 int session_new(Session
**ret
, Manager
*m
, const char *id
) {
47 _cleanup_(session_freep
) Session
*s
= NULL
;
54 if (!session_id_valid(id
))
65 .audit_id
= AUDIT_SESSION_INVALID
,
66 .tty_validity
= _TTY_VALIDITY_INVALID
,
69 s
->state_file
= path_join("/run/systemd/sessions", id
);
73 s
->id
= basename(s
->state_file
);
75 s
->devices
= hashmap_new(&devt_hash_ops
);
79 r
= hashmap_put(m
->sessions
, s
->id
, s
);
87 Session
* session_free(Session
*s
) {
94 LIST_REMOVE(gc_queue
, s
->manager
->session_gc_queue
, s
);
96 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
98 session_drop_controller(s
);
100 while ((sd
= hashmap_first(s
->devices
)))
101 session_device_free(sd
);
103 hashmap_free(s
->devices
);
106 LIST_REMOVE(sessions_by_user
, s
->user
->sessions
, s
);
108 if (s
->user
->display
== s
)
109 s
->user
->display
= NULL
;
111 user_update_last_session_timer(s
->user
);
115 if (s
->seat
->active
== s
)
116 s
->seat
->active
= NULL
;
117 if (s
->seat
->pending_switch
== s
)
118 s
->seat
->pending_switch
= NULL
;
120 seat_evict_position(s
->seat
, s
);
121 LIST_REMOVE(sessions_by_seat
, s
->seat
->sessions
, s
);
125 hashmap_remove(s
->manager
->session_units
, s
->scope
);
129 if (pid_is_valid(s
->leader
))
130 (void) hashmap_remove_value(s
->manager
->sessions_by_leader
, PID_TO_PTR(s
->leader
), s
);
134 sd_bus_message_unref(s
->create_message
);
138 free(s
->remote_host
);
139 free(s
->remote_user
);
143 hashmap_remove(s
->manager
->sessions
, s
->id
);
145 sd_event_source_unref(s
->fifo_event_source
);
146 safe_close(s
->fifo_fd
);
148 /* Note that we remove neither the state file nor the fifo path here, since we want both to survive
156 void session_set_user(Session
*s
, User
*u
) {
161 LIST_PREPEND(sessions_by_user
, u
->sessions
, s
);
163 user_update_last_session_timer(u
);
166 int session_set_leader(Session
*s
, pid_t pid
) {
171 if (!pid_is_valid(pid
))
174 if (s
->leader
== pid
)
177 r
= hashmap_put(s
->manager
->sessions_by_leader
, PID_TO_PTR(pid
), s
);
181 if (pid_is_valid(s
->leader
))
182 (void) hashmap_remove_value(s
->manager
->sessions_by_leader
, PID_TO_PTR(s
->leader
), s
);
185 (void) audit_session_from_pid(pid
, &s
->audit_id
);
190 static void session_save_devices(Session
*s
, FILE *f
) {
193 if (!hashmap_isempty(s
->devices
)) {
194 fprintf(f
, "DEVICES=");
195 HASHMAP_FOREACH(sd
, s
->devices
)
196 fprintf(f
, "%u:%u ", major(sd
->dev
), minor(sd
->dev
));
201 int session_save(Session
*s
) {
202 _cleanup_free_
char *temp_path
= NULL
;
203 _cleanup_fclose_
FILE *f
= NULL
;
214 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE
);
218 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
222 (void) fchmod(fileno(f
), 0644);
225 "# This is private data. Do not parse.\n"
232 s
->user
->user_record
->uid
,
233 s
->user
->user_record
->user_name
,
234 session_is_active(s
),
235 s
->user
->display
== s
,
236 session_state_to_string(session_get_state(s
)),
240 fprintf(f
, "TYPE=%s\n", session_type_to_string(s
->type
));
242 if (s
->original_type
>= 0)
243 fprintf(f
, "ORIGINAL_TYPE=%s\n", session_type_to_string(s
->original_type
));
246 fprintf(f
, "CLASS=%s\n", session_class_to_string(s
->class));
249 fprintf(f
, "SCOPE=%s\n", s
->scope
);
251 fprintf(f
, "SCOPE_JOB=%s\n", s
->scope_job
);
254 fprintf(f
, "FIFO=%s\n", s
->fifo_path
);
257 fprintf(f
, "SEAT=%s\n", s
->seat
->id
);
260 fprintf(f
, "TTY=%s\n", s
->tty
);
262 if (s
->tty_validity
>= 0)
263 fprintf(f
, "TTY_VALIDITY=%s\n", tty_validity_to_string(s
->tty_validity
));
266 fprintf(f
, "DISPLAY=%s\n", s
->display
);
268 if (s
->remote_host
) {
269 _cleanup_free_
char *escaped
;
271 escaped
= cescape(s
->remote_host
);
277 fprintf(f
, "REMOTE_HOST=%s\n", escaped
);
280 if (s
->remote_user
) {
281 _cleanup_free_
char *escaped
;
283 escaped
= cescape(s
->remote_user
);
289 fprintf(f
, "REMOTE_USER=%s\n", escaped
);
293 _cleanup_free_
char *escaped
;
295 escaped
= cescape(s
->service
);
301 fprintf(f
, "SERVICE=%s\n", escaped
);
305 _cleanup_free_
char *escaped
;
307 escaped
= cescape(s
->desktop
);
313 fprintf(f
, "DESKTOP=%s\n", escaped
);
316 if (s
->seat
&& seat_has_vts(s
->seat
))
317 fprintf(f
, "VTNR=%u\n", s
->vtnr
);
320 fprintf(f
, "POSITION=%u\n", s
->position
);
322 if (pid_is_valid(s
->leader
))
323 fprintf(f
, "LEADER="PID_FMT
"\n", s
->leader
);
325 if (audit_session_is_valid(s
->audit_id
))
326 fprintf(f
, "AUDIT=%"PRIu32
"\n", s
->audit_id
);
328 if (dual_timestamp_is_set(&s
->timestamp
))
330 "REALTIME="USEC_FMT
"\n"
331 "MONOTONIC="USEC_FMT
"\n",
332 s
->timestamp
.realtime
,
333 s
->timestamp
.monotonic
);
336 fprintf(f
, "CONTROLLER=%s\n", s
->controller
);
337 session_save_devices(s
, f
);
340 r
= fflush_and_check(f
);
344 if (rename(temp_path
, s
->state_file
) < 0) {
352 (void) unlink(s
->state_file
);
355 (void) unlink(temp_path
);
357 return log_error_errno(r
, "Failed to save session data %s: %m", s
->state_file
);
360 static int session_load_devices(Session
*s
, const char *devices
) {
366 for (p
= devices
;;) {
367 _cleanup_free_
char *word
= NULL
;
372 k
= extract_first_word(&p
, &word
, NULL
, 0);
380 k
= parse_dev(word
, &dev
);
386 /* The file descriptors for loaded devices will be reattached later. */
387 k
= session_device_new(s
, dev
, false, &sd
);
393 log_error_errno(r
, "Loading session devices for session %s failed: %m", s
->id
);
398 int session_load(Session
*s
) {
399 _cleanup_free_
char *remote
= NULL
,
401 *tty_validity
= NULL
,
407 *original_type
= NULL
,
421 r
= parse_env_file(NULL
, s
->state_file
,
424 "SCOPE_JOB", &s
->scope_job
,
425 "FIFO", &s
->fifo_path
,
428 "TTY_VALIDITY", &tty_validity
,
429 "DISPLAY", &s
->display
,
430 "REMOTE_HOST", &s
->remote_host
,
431 "REMOTE_USER", &s
->remote_user
,
432 "SERVICE", &s
->service
,
433 "DESKTOP", &s
->desktop
,
436 "POSITION", &position
,
439 "ORIGINAL_TYPE", &original_type
,
442 "REALTIME", &realtime
,
443 "MONOTONIC", &monotonic
,
444 "CONTROLLER", &controller
,
447 "IS_DISPLAY", &is_display
);
450 return log_error_errno(r
, "Failed to read %s: %m", s
->state_file
);
457 return log_error_errno(SYNTHETIC_ERRNO(ENOENT
),
458 "UID not specified for session %s",
461 r
= parse_uid(uid
, &u
);
463 log_error("Failed to parse UID value %s for session %s.", uid
, s
->id
);
467 user
= hashmap_get(s
->manager
->users
, UID_TO_PTR(u
));
469 return log_error_errno(SYNTHETIC_ERRNO(ENOENT
),
470 "User of session %s not known.",
473 session_set_user(s
, user
);
477 k
= parse_boolean(remote
);
483 safe_atou(vtnr
, &s
->vtnr
);
485 if (seat
&& !s
->seat
) {
488 o
= hashmap_get(s
->manager
->seats
, seat
);
490 r
= seat_attach_session(o
, s
);
492 log_error("Cannot attach session %s to seat %s", s
->id
, seat
);
495 if (!s
->seat
|| !seat_has_vts(s
->seat
))
498 if (position
&& s
->seat
) {
501 safe_atou(position
, &npos
);
502 seat_claim_position(s
->seat
, s
, npos
);
508 v
= tty_validity_from_string(tty_validity
);
510 log_debug("Failed to parse TTY validity: %s", tty_validity
);
518 r
= parse_pid(leader
, &pid
);
520 log_debug_errno(r
, "Failed to parse leader PID of session: %s", leader
);
522 r
= session_set_leader(s
, pid
);
524 log_warning_errno(r
, "Failed to set session leader PID, ignoring: %m");
531 t
= session_type_from_string(type
);
539 ot
= session_type_from_string(original_type
);
541 s
->original_type
= ot
;
543 /* Pre-v246 compat: initialize original_type if not set in the state file */
544 s
->original_type
= s
->type
;
549 c
= session_class_from_string(class);
554 if (state
&& streq(state
, "closing"))
560 /* If we open an unopened pipe for reading we will not
561 get an EOF. to trigger an EOF we hence open it for
562 writing, but close it right away which then will
563 trigger the EOF. This will happen immediately if no
564 other process has the FIFO open for writing, i. e.
565 when the session died before logind (re)started. */
567 fd
= session_create_fifo(s
);
572 (void) deserialize_usec(realtime
, &s
->timestamp
.realtime
);
574 (void) deserialize_usec(monotonic
, &s
->timestamp
.monotonic
);
577 k
= parse_boolean(active
);
583 /* Note that when enumerating users are loaded before sessions, hence the display session to use is
584 * something we have to store along with the session and not the user, as in that case we couldn't
585 * apply it at the time we load the user. */
587 k
= parse_boolean(is_display
);
589 log_warning_errno(k
, "Failed to parse IS_DISPLAY session property: %m");
591 s
->user
->display
= s
;
595 if (bus_name_has_owner(s
->manager
->bus
, controller
, NULL
) > 0) {
596 session_set_controller(s
, controller
, false, false);
597 session_load_devices(s
, devices
);
599 session_restore_vt(s
);
605 int session_activate(Session
*s
) {
606 unsigned num_pending
;
614 if (s
->seat
->active
== s
)
617 /* on seats with VTs, we let VTs manage session-switching */
618 if (seat_has_vts(s
->seat
)) {
622 return chvt(s
->vtnr
);
625 /* On seats without VTs, we implement session-switching in logind. We
626 * try to pause all session-devices and wait until the session
627 * controller acknowledged them. Once all devices are asleep, we simply
628 * switch the active session and be done.
629 * We save the session we want to switch to in seat->pending_switch and
630 * seat_complete_switch() will perform the final switch. */
632 s
->seat
->pending_switch
= s
;
634 /* if no devices are running, immediately perform the session switch */
635 num_pending
= session_device_try_pause_all(s
);
637 seat_complete_switch(s
->seat
);
642 static int session_start_scope(Session
*s
, sd_bus_message
*properties
, sd_bus_error
*error
) {
649 _cleanup_free_
char *scope
= NULL
;
650 const char *description
;
652 s
->scope_job
= mfree(s
->scope_job
);
654 scope
= strjoin("session-", s
->id
, ".scope");
658 description
= strjoina("Session ", s
->id
, " of user ", s
->user
->user_record
->user_name
);
660 r
= manager_start_scope(
666 /* These two have StopWhenUnneeded= set, hence add a dep towards them */
667 STRV_MAKE(s
->user
->runtime_dir_service
,
669 /* And order us after some more */
670 STRV_MAKE("systemd-logind.service",
671 "systemd-user-sessions.service",
672 s
->user
->runtime_dir_service
,
674 user_record_home_directory(s
->user
->user_record
),
679 return log_error_errno(r
, "Failed to start session scope %s: %s",
680 scope
, bus_error_message(error
, r
));
682 s
->scope
= TAKE_PTR(scope
);
685 (void) hashmap_put(s
->manager
->session_units
, s
->scope
, s
);
690 int session_start(Session
*s
, sd_bus_message
*properties
, sd_bus_error
*error
) {
704 r
= user_start(s
->user
);
708 r
= session_start_scope(s
, properties
, error
);
712 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
713 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR
,
714 "SESSION_ID=%s", s
->id
,
715 "USER_ID=%s", s
->user
->user_record
->user_name
,
716 "LEADER="PID_FMT
, s
->leader
,
717 LOG_MESSAGE("New session %s of user %s.", s
->id
, s
->user
->user_record
->user_name
));
719 if (!dual_timestamp_is_set(&s
->timestamp
))
720 dual_timestamp_get(&s
->timestamp
);
723 seat_read_active_vt(s
->seat
);
727 user_elect_display(s
->user
);
736 session_send_signal(s
, true);
737 user_send_changed(s
->user
, "Display", NULL
);
739 if (s
->seat
&& s
->seat
->active
== s
)
740 seat_send_changed(s
->seat
, "ActiveSession", NULL
);
745 static int session_stop_scope(Session
*s
, bool force
) {
746 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
754 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
755 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
756 * when killing any processes left after this point. */
757 r
= manager_abandon_scope(s
->manager
, s
->scope
, &error
);
759 log_warning_errno(r
, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error
, r
));
760 sd_bus_error_free(&error
);
763 s
->scope_job
= mfree(s
->scope_job
);
765 /* Optionally, let's kill everything that's left now. */
767 (s
->user
->user_record
->kill_processes
!= 0 &&
768 (s
->user
->user_record
->kill_processes
> 0 ||
769 manager_shall_kill(s
->manager
, s
->user
->user_record
->user_name
)))) {
771 r
= manager_stop_unit(s
->manager
, s
->scope
, force
? "replace" : "fail", &error
, &s
->scope_job
);
774 return log_error_errno(r
, "Failed to stop session scope: %s", bus_error_message(&error
, r
));
776 log_warning_errno(r
, "Failed to stop session scope, ignoring: %s", bus_error_message(&error
, r
));
780 /* With no killing, this session is allowed to persist in "closing" state indefinitely.
781 * Therefore session stop and session removal may be two distinct events.
782 * Session stop is quite significant on its own, let's log it. */
783 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
784 "SESSION_ID=%s", s
->id
,
785 "USER_ID=%s", s
->user
->user_record
->user_name
,
786 "LEADER="PID_FMT
, s
->leader
,
787 LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s
->id
));
793 int session_stop(Session
*s
, bool force
) {
798 /* This is called whenever we begin with tearing down a session record. It's called in four cases: explicit API
799 * request via the bus (either directly for the session object or for the seat or user object this session
800 * belongs to; 'force' is true), or due to automatic GC (i.e. scope vanished; 'force' is false), or because the
801 * session FIFO saw an EOF ('force' is false), or because the release timer hit ('force' is false). */
810 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
813 seat_evict_position(s
->seat
, s
);
815 /* We are going down, don't care about FIFOs anymore */
816 session_remove_fifo(s
);
819 r
= session_stop_scope(s
, force
);
823 user_elect_display(s
->user
);
831 int session_finalize(Session
*s
) {
840 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
841 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR
,
842 "SESSION_ID=%s", s
->id
,
843 "USER_ID=%s", s
->user
->user_record
->user_name
,
844 "LEADER="PID_FMT
, s
->leader
,
845 LOG_MESSAGE("Removed session %s.", s
->id
));
847 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
850 seat_evict_position(s
->seat
, s
);
852 /* Kill session devices */
853 while ((sd
= hashmap_first(s
->devices
)))
854 session_device_free(sd
);
856 (void) unlink(s
->state_file
);
857 session_add_to_gc_queue(s
);
858 user_add_to_gc_queue(s
->user
);
861 session_send_signal(s
, false);
866 if (s
->seat
->active
== s
)
867 seat_set_active(s
->seat
, NULL
);
873 user_send_changed(s
->user
, "Display", NULL
);
878 static int release_timeout_callback(sd_event_source
*es
, uint64_t usec
, void *userdata
) {
879 Session
*s
= userdata
;
884 session_stop(s
, /* force = */ false);
888 int session_release(Session
*s
) {
891 if (!s
->started
|| s
->stopping
)
894 if (s
->timer_event_source
)
897 return sd_event_add_time_relative(
899 &s
->timer_event_source
,
902 release_timeout_callback
, s
);
905 bool session_is_active(Session
*s
) {
911 return s
->seat
->active
== s
;
914 static int get_tty_atime(const char *tty
, usec_t
*atime
) {
915 _cleanup_free_
char *p
= NULL
;
921 if (!path_is_absolute(tty
)) {
922 p
= path_join("/dev", tty
);
927 } else if (!path_startswith(tty
, "/dev/"))
930 if (lstat(tty
, &st
) < 0)
933 *atime
= timespec_load(&st
.st_atim
);
937 static int get_process_ctty_atime(pid_t pid
, usec_t
*atime
) {
938 _cleanup_free_
char *p
= NULL
;
944 r
= get_ctty(pid
, NULL
, &p
);
948 return get_tty_atime(p
, atime
);
951 int session_get_idle_hint(Session
*s
, dual_timestamp
*t
) {
957 /* Graphical sessions have an explicit idle hint */
958 if (SESSION_TYPE_IS_GRAPHICAL(s
->type
)) {
960 *t
= s
->idle_hint_timestamp
;
965 /* For sessions with an explicitly configured tty, let's check its atime */
967 r
= get_tty_atime(s
->tty
, &atime
);
972 /* For sessions with a leader but no explicitly configured tty, let's check the controlling tty of
974 if (pid_is_valid(s
->leader
)) {
975 r
= get_process_ctty_atime(s
->leader
, &atime
);
981 *t
= DUAL_TIMESTAMP_NULL
;
987 dual_timestamp_from_realtime(t
, atime
);
989 if (s
->manager
->idle_action_usec
<= 0)
992 return usec_add(atime
, s
->manager
->idle_action_usec
) <= now(CLOCK_REALTIME
);
995 int session_set_idle_hint(Session
*s
, bool b
) {
998 if (!SESSION_TYPE_IS_GRAPHICAL(s
->type
))
1001 if (s
->idle_hint
== b
)
1005 dual_timestamp_get(&s
->idle_hint_timestamp
);
1007 session_send_changed(s
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
1010 seat_send_changed(s
->seat
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
1012 user_send_changed(s
->user
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
1013 manager_send_changed(s
->manager
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
1018 int session_get_locked_hint(Session
*s
) {
1021 return s
->locked_hint
;
1024 void session_set_locked_hint(Session
*s
, bool b
) {
1027 if (s
->locked_hint
== b
)
1032 session_send_changed(s
, "LockedHint", NULL
);
1035 void session_set_type(Session
*s
, SessionType t
) {
1044 session_send_changed(s
, "Type", NULL
);
1047 static int session_dispatch_fifo(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
1048 Session
*s
= userdata
;
1051 assert(s
->fifo_fd
== fd
);
1053 /* EOF on the FIFO means the session died abnormally. */
1055 session_remove_fifo(s
);
1056 session_stop(s
, /* force = */ false);
1061 int session_create_fifo(Session
*s
) {
1067 if (!s
->fifo_path
) {
1068 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE
);
1072 s
->fifo_path
= strjoin("/run/systemd/sessions/", s
->id
, ".ref");
1076 if (mkfifo(s
->fifo_path
, 0600) < 0 && errno
!= EEXIST
)
1080 /* Open reading side */
1081 if (s
->fifo_fd
< 0) {
1082 s
->fifo_fd
= open(s
->fifo_path
, O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
);
1087 if (!s
->fifo_event_source
) {
1088 r
= sd_event_add_io(s
->manager
->event
, &s
->fifo_event_source
, s
->fifo_fd
, 0, session_dispatch_fifo
, s
);
1092 /* Let's make sure we noticed dead sessions before we process new bus requests (which might
1093 * create new sessions). */
1094 r
= sd_event_source_set_priority(s
->fifo_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
1099 /* Open writing side */
1100 r
= open(s
->fifo_path
, O_WRONLY
|O_CLOEXEC
|O_NONBLOCK
);
1107 static void session_remove_fifo(Session
*s
) {
1110 s
->fifo_event_source
= sd_event_source_unref(s
->fifo_event_source
);
1111 s
->fifo_fd
= safe_close(s
->fifo_fd
);
1114 (void) unlink(s
->fifo_path
);
1115 s
->fifo_path
= mfree(s
->fifo_path
);
1119 bool session_may_gc(Session
*s
, bool drop_not_started
) {
1124 if (drop_not_started
&& !s
->started
)
1130 if (s
->fifo_fd
>= 0) {
1131 if (pipe_eof(s
->fifo_fd
) <= 0)
1136 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1138 r
= manager_job_is_active(s
->manager
, s
->scope_job
, &error
);
1140 log_debug_errno(r
, "Failed to determine whether job '%s' is pending, ignoring: %s", s
->scope_job
, bus_error_message(&error
, r
));
1146 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1148 r
= manager_unit_is_active(s
->manager
, s
->scope
, &error
);
1150 log_debug_errno(r
, "Failed to determine whether unit '%s' is active, ignoring: %s", s
->scope
, bus_error_message(&error
, r
));
1158 void session_add_to_gc_queue(Session
*s
) {
1164 LIST_PREPEND(gc_queue
, s
->manager
->session_gc_queue
, s
);
1165 s
->in_gc_queue
= true;
1168 SessionState
session_get_state(Session
*s
) {
1171 /* always check closing first */
1172 if (s
->stopping
|| s
->timer_event_source
)
1173 return SESSION_CLOSING
;
1175 if (s
->scope_job
|| s
->fifo_fd
< 0)
1176 return SESSION_OPENING
;
1178 if (session_is_active(s
))
1179 return SESSION_ACTIVE
;
1181 return SESSION_ONLINE
;
1184 int session_kill(Session
*s
, KillWho who
, int signo
) {
1190 return manager_kill_unit(s
->manager
, s
->scope
, who
, signo
, NULL
);
1193 static int session_open_vt(Session
*s
) {
1194 char path
[sizeof("/dev/tty") + DECIMAL_STR_MAX(s
->vtnr
)];
1202 sprintf(path
, "/dev/tty%u", s
->vtnr
);
1203 s
->vtfd
= open_terminal(path
, O_RDWR
| O_CLOEXEC
| O_NONBLOCK
| O_NOCTTY
);
1205 return log_error_errno(s
->vtfd
, "cannot open VT %s of session %s: %m", path
, s
->id
);
1210 static int session_prepare_vt(Session
*s
) {
1212 struct vt_mode mode
= {};
1217 vt
= session_open_vt(s
);
1221 r
= fchown(vt
, s
->user
->user_record
->uid
, -1);
1223 r
= log_error_errno(errno
,
1224 "Cannot change owner of /dev/tty%u: %m",
1229 r
= ioctl(vt
, KDSKBMODE
, K_OFF
);
1231 r
= log_error_errno(errno
,
1232 "Cannot set K_OFF on /dev/tty%u: %m",
1237 r
= ioctl(vt
, KDSETMODE
, KD_GRAPHICS
);
1239 r
= log_error_errno(errno
,
1240 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1245 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1246 * So we need a dummy handler here which just acknowledges *all* VT
1247 * switch requests. */
1248 mode
.mode
= VT_PROCESS
;
1249 mode
.relsig
= SIGRTMIN
;
1250 mode
.acqsig
= SIGRTMIN
+ 1;
1251 r
= ioctl(vt
, VT_SETMODE
, &mode
);
1253 r
= log_error_errno(errno
,
1254 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1262 session_restore_vt(s
);
1266 static void session_restore_vt(Session
*s
) {
1269 r
= vt_restore(s
->vtfd
);
1273 /* It might happen if the controlling process exited before or while we were
1274 * restoring the VT as it would leave the old file-descriptor in a hung-up
1275 * state. In this case let's retry with a fresh handle to the virtual terminal. */
1277 /* We do a little dance to avoid having the terminal be available
1278 * for reuse before we've cleaned it up. */
1279 old_fd
= TAKE_FD(s
->vtfd
);
1281 vt
= session_open_vt(s
);
1289 log_warning_errno(r
, "Failed to restore VT, ignoring: %m");
1291 s
->vtfd
= safe_close(s
->vtfd
);
1294 void session_leave_vt(Session
*s
) {
1299 /* This is called whenever we get a VT-switch signal from the kernel.
1300 * We acknowledge all of them unconditionally. Note that session are
1301 * free to overwrite those handlers and we only register them for
1302 * sessions with controllers. Legacy sessions are not affected.
1303 * However, if we switch from a non-legacy to a legacy session, we must
1304 * make sure to pause all device before acknowledging the switch. We
1305 * process the real switch only after we are notified via sysfs, so the
1306 * legacy session might have already started using the devices. If we
1307 * don't pause the devices before the switch, we might confuse the
1308 * session we switch to. */
1313 session_device_pause_all(s
);
1314 r
= vt_release(s
->vtfd
, false);
1316 log_debug_errno(r
, "Cannot release VT of session %s: %m", s
->id
);
1319 bool session_is_controller(Session
*s
, const char *sender
) {
1322 return streq_ptr(s
->controller
, sender
);
1325 static void session_release_controller(Session
*s
, bool notify
) {
1326 _cleanup_free_
char *name
= NULL
;
1332 name
= s
->controller
;
1334 /* By resetting the controller before releasing the devices, we won't send notification signals.
1335 * This avoids sending useless notifications if the controller is released on disconnects. */
1337 s
->controller
= NULL
;
1339 while ((sd
= hashmap_first(s
->devices
)))
1340 session_device_free(sd
);
1342 s
->controller
= NULL
;
1343 s
->track
= sd_bus_track_unref(s
->track
);
1346 static int on_bus_track(sd_bus_track
*track
, void *userdata
) {
1347 Session
*s
= userdata
;
1352 session_drop_controller(s
);
1357 int session_set_controller(Session
*s
, const char *sender
, bool force
, bool prepare
) {
1358 _cleanup_free_
char *name
= NULL
;
1364 if (session_is_controller(s
, sender
))
1366 if (s
->controller
&& !force
)
1369 name
= strdup(sender
);
1373 s
->track
= sd_bus_track_unref(s
->track
);
1374 r
= sd_bus_track_new(s
->manager
->bus
, &s
->track
, on_bus_track
, s
);
1378 r
= sd_bus_track_add_name(s
->track
, name
);
1382 /* When setting a session controller, we forcibly mute the VT and set
1383 * it into graphics-mode. Applications can override that by changing
1384 * VT state after calling TakeControl(). However, this serves as a good
1385 * default and well-behaving controllers can now ignore VTs entirely.
1386 * Note that we reset the VT on ReleaseControl() and if the controller
1388 * If logind crashes/restarts, we restore the controller during restart
1389 * (without preparing the VT since the controller has probably overridden
1390 * VT state by now) or reset the VT in case it crashed/exited, too. */
1392 r
= session_prepare_vt(s
);
1394 s
->track
= sd_bus_track_unref(s
->track
);
1399 session_release_controller(s
, true);
1400 s
->controller
= TAKE_PTR(name
);
1406 void session_drop_controller(Session
*s
) {
1412 s
->track
= sd_bus_track_unref(s
->track
);
1413 session_set_type(s
, s
->original_type
);
1414 session_release_controller(s
, false);
1416 session_restore_vt(s
);
1419 static const char* const session_state_table
[_SESSION_STATE_MAX
] = {
1420 [SESSION_OPENING
] = "opening",
1421 [SESSION_ONLINE
] = "online",
1422 [SESSION_ACTIVE
] = "active",
1423 [SESSION_CLOSING
] = "closing",
1426 DEFINE_STRING_TABLE_LOOKUP(session_state
, SessionState
);
1428 static const char* const session_type_table
[_SESSION_TYPE_MAX
] = {
1429 [SESSION_UNSPECIFIED
] = "unspecified",
1430 [SESSION_TTY
] = "tty",
1431 [SESSION_X11
] = "x11",
1432 [SESSION_WAYLAND
] = "wayland",
1433 [SESSION_MIR
] = "mir",
1434 [SESSION_WEB
] = "web",
1437 DEFINE_STRING_TABLE_LOOKUP(session_type
, SessionType
);
1439 static const char* const session_class_table
[_SESSION_CLASS_MAX
] = {
1440 [SESSION_USER
] = "user",
1441 [SESSION_GREETER
] = "greeter",
1442 [SESSION_LOCK_SCREEN
] = "lock-screen",
1443 [SESSION_BACKGROUND
] = "background",
1446 DEFINE_STRING_TABLE_LOOKUP(session_class
, SessionClass
);
1448 static const char* const kill_who_table
[_KILL_WHO_MAX
] = {
1449 [KILL_LEADER
] = "leader",
1453 DEFINE_STRING_TABLE_LOOKUP(kill_who
, KillWho
);
1455 static const char* const tty_validity_table
[_TTY_VALIDITY_MAX
] = {
1456 [TTY_FROM_PAM
] = "from-pam",
1457 [TTY_FROM_UTMP
] = "from-utmp",
1458 [TTY_UTMP_INCONSISTENT
] = "utmp-inconsistent",
1461 DEFINE_STRING_TABLE_LOOKUP(tty_validity
, TTYValidity
);