1 /* SPDX-License-Identifier: LGPL-2.1+ */
12 #include "sd-messages.h"
14 #include "alloc-util.h"
15 #include "audit-util.h"
16 #include "bus-error.h"
21 #include "format-util.h"
23 #include "logind-session.h"
25 #include "parse-util.h"
26 #include "path-util.h"
27 #include "string-table.h"
28 #include "terminal-util.h"
29 #include "user-util.h"
31 #include "process-util.h"
33 #define RELEASE_USEC (20*USEC_PER_SEC)
35 static void session_remove_fifo(Session
*s
);
37 Session
* session_new(Manager
*m
, const char *id
) {
42 assert(session_id_valid(id
));
48 s
->state_file
= strappend("/run/systemd/sessions/", id
);
52 s
->devices
= hashmap_new(&devt_hash_ops
);
58 s
->id
= basename(s
->state_file
);
60 if (hashmap_put(m
->sessions
, s
->id
, s
) < 0) {
61 hashmap_free(s
->devices
);
69 s
->audit_id
= AUDIT_SESSION_INVALID
;
74 void session_free(Session
*s
) {
80 LIST_REMOVE(gc_queue
, s
->manager
->session_gc_queue
, s
);
82 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
84 session_remove_fifo(s
);
86 session_drop_controller(s
);
88 while ((sd
= hashmap_first(s
->devices
)))
89 session_device_free(sd
);
91 hashmap_free(s
->devices
);
94 LIST_REMOVE(sessions_by_user
, s
->user
->sessions
, s
);
96 if (s
->user
->display
== s
)
97 s
->user
->display
= NULL
;
101 if (s
->seat
->active
== s
)
102 s
->seat
->active
= NULL
;
103 if (s
->seat
->pending_switch
== s
)
104 s
->seat
->pending_switch
= NULL
;
106 seat_evict_position(s
->seat
, s
);
107 LIST_REMOVE(sessions_by_seat
, s
->seat
->sessions
, s
);
111 hashmap_remove(s
->manager
->session_units
, s
->scope
);
117 sd_bus_message_unref(s
->create_message
);
121 free(s
->remote_host
);
122 free(s
->remote_user
);
126 hashmap_remove(s
->manager
->sessions
, s
->id
);
132 void session_set_user(Session
*s
, User
*u
) {
137 LIST_PREPEND(sessions_by_user
, u
->sessions
, s
);
140 static void session_save_devices(Session
*s
, FILE *f
) {
144 if (!hashmap_isempty(s
->devices
)) {
145 fprintf(f
, "DEVICES=");
146 HASHMAP_FOREACH(sd
, s
->devices
, i
)
147 fprintf(f
, "%u:%u ", major(sd
->dev
), minor(sd
->dev
));
152 int session_save(Session
*s
) {
153 _cleanup_free_
char *temp_path
= NULL
;
154 _cleanup_fclose_
FILE *f
= NULL
;
165 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE
);
169 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
175 fchmod(fileno(f
), 0644);
178 "# This is private data. Do not parse.\n"
186 session_is_active(s
),
187 session_state_to_string(session_get_state(s
)),
191 fprintf(f
, "TYPE=%s\n", session_type_to_string(s
->type
));
194 fprintf(f
, "CLASS=%s\n", session_class_to_string(s
->class));
197 fprintf(f
, "SCOPE=%s\n", s
->scope
);
199 fprintf(f
, "SCOPE_JOB=%s\n", s
->scope_job
);
202 fprintf(f
, "FIFO=%s\n", s
->fifo_path
);
205 fprintf(f
, "SEAT=%s\n", s
->seat
->id
);
208 fprintf(f
, "TTY=%s\n", s
->tty
);
211 fprintf(f
, "DISPLAY=%s\n", s
->display
);
213 if (s
->remote_host
) {
214 _cleanup_free_
char *escaped
;
216 escaped
= cescape(s
->remote_host
);
222 fprintf(f
, "REMOTE_HOST=%s\n", escaped
);
225 if (s
->remote_user
) {
226 _cleanup_free_
char *escaped
;
228 escaped
= cescape(s
->remote_user
);
234 fprintf(f
, "REMOTE_USER=%s\n", escaped
);
238 _cleanup_free_
char *escaped
;
240 escaped
= cescape(s
->service
);
246 fprintf(f
, "SERVICE=%s\n", escaped
);
250 _cleanup_free_
char *escaped
;
252 escaped
= cescape(s
->desktop
);
258 fprintf(f
, "DESKTOP=%s\n", escaped
);
261 if (s
->seat
&& seat_has_vts(s
->seat
))
262 fprintf(f
, "VTNR=%u\n", s
->vtnr
);
265 fprintf(f
, "POSITION=%u\n", s
->position
);
267 if (pid_is_valid(s
->leader
))
268 fprintf(f
, "LEADER="PID_FMT
"\n", s
->leader
);
270 if (audit_session_is_valid(s
->audit_id
))
271 fprintf(f
, "AUDIT=%"PRIu32
"\n", s
->audit_id
);
273 if (dual_timestamp_is_set(&s
->timestamp
))
275 "REALTIME="USEC_FMT
"\n"
276 "MONOTONIC="USEC_FMT
"\n",
277 s
->timestamp
.realtime
,
278 s
->timestamp
.monotonic
);
281 fprintf(f
, "CONTROLLER=%s\n", s
->controller
);
282 session_save_devices(s
, f
);
285 r
= fflush_and_check(f
);
289 if (rename(temp_path
, s
->state_file
) < 0) {
297 (void) unlink(s
->state_file
);
300 (void) unlink(temp_path
);
302 return log_error_errno(r
, "Failed to save session data %s: %m", s
->state_file
);
305 static int session_load_devices(Session
*s
, const char *devices
) {
311 for (p
= devices
;;) {
312 _cleanup_free_
char *word
= NULL
;
317 k
= extract_first_word(&p
, &word
, NULL
, 0);
325 k
= parse_dev(word
, &dev
);
331 /* The file descriptors for loaded devices will be reattached later. */
332 k
= session_device_new(s
, dev
, false, &sd
);
338 log_error_errno(r
, "Loading session devices for session %s failed: %m", s
->id
);
343 int session_load(Session
*s
) {
344 _cleanup_free_
char *remote
= NULL
,
363 r
= parse_env_file(NULL
, s
->state_file
, NEWLINE
,
366 "SCOPE_JOB", &s
->scope_job
,
367 "FIFO", &s
->fifo_path
,
370 "DISPLAY", &s
->display
,
371 "REMOTE_HOST", &s
->remote_host
,
372 "REMOTE_USER", &s
->remote_user
,
373 "SERVICE", &s
->service
,
374 "DESKTOP", &s
->desktop
,
377 "POSITION", &position
,
382 "REALTIME", &realtime
,
383 "MONOTONIC", &monotonic
,
384 "CONTROLLER", &controller
,
390 return log_error_errno(r
, "Failed to read %s: %m", s
->state_file
);
397 log_error("UID not specified for session %s", s
->id
);
401 r
= parse_uid(uid
, &u
);
403 log_error("Failed to parse UID value %s for session %s.", uid
, s
->id
);
407 user
= hashmap_get(s
->manager
->users
, UID_TO_PTR(u
));
409 log_error("User of session %s not known.", s
->id
);
413 session_set_user(s
, user
);
417 k
= parse_boolean(remote
);
423 safe_atou(vtnr
, &s
->vtnr
);
425 if (seat
&& !s
->seat
) {
428 o
= hashmap_get(s
->manager
->seats
, seat
);
430 r
= seat_attach_session(o
, s
);
432 log_error("Cannot attach session %s to seat %s", s
->id
, seat
);
435 if (!s
->seat
|| !seat_has_vts(s
->seat
))
438 if (position
&& s
->seat
) {
441 safe_atou(position
, &npos
);
442 seat_claim_position(s
->seat
, s
, npos
);
446 if (parse_pid(leader
, &s
->leader
) >= 0)
447 (void) audit_session_from_pid(s
->leader
, &s
->audit_id
);
453 t
= session_type_from_string(type
);
461 c
= session_class_from_string(class);
466 if (state
&& streq(state
, "closing"))
472 /* If we open an unopened pipe for reading we will not
473 get an EOF. to trigger an EOF we hence open it for
474 writing, but close it right away which then will
475 trigger the EOF. This will happen immediately if no
476 other process has the FIFO open for writing, i. e.
477 when the session died before logind (re)started. */
479 fd
= session_create_fifo(s
);
484 timestamp_deserialize(realtime
, &s
->timestamp
.realtime
);
486 timestamp_deserialize(monotonic
, &s
->timestamp
.monotonic
);
489 k
= parse_boolean(active
);
495 if (bus_name_has_owner(s
->manager
->bus
, controller
, NULL
) > 0) {
496 session_set_controller(s
, controller
, false, false);
497 session_load_devices(s
, devices
);
499 session_restore_vt(s
);
505 int session_activate(Session
*s
) {
506 unsigned int num_pending
;
514 if (s
->seat
->active
== s
)
517 /* on seats with VTs, we let VTs manage session-switching */
518 if (seat_has_vts(s
->seat
)) {
522 return chvt(s
->vtnr
);
525 /* On seats without VTs, we implement session-switching in logind. We
526 * try to pause all session-devices and wait until the session
527 * controller acknowledged them. Once all devices are asleep, we simply
528 * switch the active session and be done.
529 * We save the session we want to switch to in seat->pending_switch and
530 * seat_complete_switch() will perform the final switch. */
532 s
->seat
->pending_switch
= s
;
534 /* if no devices are running, immediately perform the session switch */
535 num_pending
= session_device_try_pause_all(s
);
537 seat_complete_switch(s
->seat
);
542 static int session_start_scope(Session
*s
, sd_bus_message
*properties
) {
549 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
550 char *scope
, *job
= NULL
;
551 const char *description
;
553 scope
= strjoin("session-", s
->id
, ".scope");
557 description
= strjoina("Session ", s
->id
, " of user ", s
->user
->name
);
559 r
= manager_start_scope(
565 "systemd-logind.service",
566 "systemd-user-sessions.service",
571 log_error_errno(r
, "Failed to start session scope %s: %s", scope
, bus_error_message(&error
, r
));
583 (void) hashmap_put(s
->manager
->session_units
, s
->scope
, s
);
588 int session_start(Session
*s
, sd_bus_message
*properties
) {
599 r
= user_start(s
->user
);
604 r
= session_start_scope(s
, properties
);
608 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
609 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR
,
610 "SESSION_ID=%s", s
->id
,
611 "USER_ID=%s", s
->user
->name
,
612 "LEADER="PID_FMT
, s
->leader
,
613 LOG_MESSAGE("New session %s of user %s.", s
->id
, s
->user
->name
));
615 if (!dual_timestamp_is_set(&s
->timestamp
))
616 dual_timestamp_get(&s
->timestamp
);
619 seat_read_active_vt(s
->seat
);
623 user_elect_display(s
->user
);
632 session_send_signal(s
, true);
633 user_send_changed(s
->user
, "Display", NULL
);
635 if (s
->seat
->active
== s
)
636 seat_send_changed(s
->seat
, "ActiveSession", NULL
);
642 static int session_stop_scope(Session
*s
, bool force
) {
643 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
651 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
652 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
653 * when killing any processes left after this point. */
654 r
= manager_abandon_scope(s
->manager
, s
->scope
, &error
);
656 log_warning_errno(r
, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error
, r
));
658 /* Optionally, let's kill everything that's left now. */
659 if (force
|| manager_shall_kill(s
->manager
, s
->user
->name
)) {
662 r
= manager_stop_unit(s
->manager
, s
->scope
, &error
, &job
);
664 return log_error_errno(r
, "Failed to stop session scope: %s", bus_error_message(&error
, r
));
669 s
->scope_job
= mfree(s
->scope_job
);
671 /* With no killing, this session is allowed to persist in "closing" state indefinitely.
672 * Therefore session stop and session removal may be two distinct events.
673 * Session stop is quite significant on its own, let's log it. */
674 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
675 "SESSION_ID=%s", s
->id
,
676 "USER_ID=%s", s
->user
->name
,
677 "LEADER="PID_FMT
, s
->leader
,
678 LOG_MESSAGE("Session %s logged out. Waiting for processes to exit.", s
->id
));
684 int session_stop(Session
*s
, bool force
) {
692 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
695 seat_evict_position(s
->seat
, s
);
697 /* We are going down, don't care about FIFOs anymore */
698 session_remove_fifo(s
);
701 r
= session_stop_scope(s
, force
);
705 user_elect_display(s
->user
);
713 int session_finalize(Session
*s
) {
722 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
723 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR
,
724 "SESSION_ID=%s", s
->id
,
725 "USER_ID=%s", s
->user
->name
,
726 "LEADER="PID_FMT
, s
->leader
,
727 LOG_MESSAGE("Removed session %s.", s
->id
));
729 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
732 seat_evict_position(s
->seat
, s
);
734 /* Kill session devices */
735 while ((sd
= hashmap_first(s
->devices
)))
736 session_device_free(sd
);
738 (void) unlink(s
->state_file
);
739 session_add_to_gc_queue(s
);
740 user_add_to_gc_queue(s
->user
);
743 session_send_signal(s
, false);
748 if (s
->seat
->active
== s
)
749 seat_set_active(s
->seat
, NULL
);
755 user_send_changed(s
->user
, "Display", NULL
);
760 static int release_timeout_callback(sd_event_source
*es
, uint64_t usec
, void *userdata
) {
761 Session
*s
= userdata
;
766 session_stop(s
, false);
770 int session_release(Session
*s
) {
773 if (!s
->started
|| s
->stopping
)
776 if (s
->timer_event_source
)
779 return sd_event_add_time(s
->manager
->event
,
780 &s
->timer_event_source
,
782 now(CLOCK_MONOTONIC
) + RELEASE_USEC
, 0,
783 release_timeout_callback
, s
);
786 bool session_is_active(Session
*s
) {
792 return s
->seat
->active
== s
;
795 static int get_tty_atime(const char *tty
, usec_t
*atime
) {
796 _cleanup_free_
char *p
= NULL
;
802 if (!path_is_absolute(tty
)) {
803 p
= strappend("/dev/", tty
);
808 } else if (!path_startswith(tty
, "/dev/"))
811 if (lstat(tty
, &st
) < 0)
814 *atime
= timespec_load(&st
.st_atim
);
818 static int get_process_ctty_atime(pid_t pid
, usec_t
*atime
) {
819 _cleanup_free_
char *p
= NULL
;
825 r
= get_ctty(pid
, NULL
, &p
);
829 return get_tty_atime(p
, atime
);
832 int session_get_idle_hint(Session
*s
, dual_timestamp
*t
) {
838 /* Explicit idle hint is set */
841 *t
= s
->idle_hint_timestamp
;
846 /* Graphical sessions should really implement a real
848 if (SESSION_TYPE_IS_GRAPHICAL(s
->type
))
851 /* For sessions with an explicitly configured tty, let's check
854 r
= get_tty_atime(s
->tty
, &atime
);
859 /* For sessions with a leader but no explicitly configured
860 * tty, let's check the controlling tty of the leader */
862 r
= get_process_ctty_atime(s
->leader
, &atime
);
869 *t
= s
->idle_hint_timestamp
;
875 dual_timestamp_from_realtime(t
, atime
);
877 n
= now(CLOCK_REALTIME
);
879 if (s
->manager
->idle_action_usec
<= 0)
882 return atime
+ s
->manager
->idle_action_usec
<= n
;
885 void session_set_idle_hint(Session
*s
, bool b
) {
888 if (s
->idle_hint
== b
)
892 dual_timestamp_get(&s
->idle_hint_timestamp
);
894 session_send_changed(s
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
897 seat_send_changed(s
->seat
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
899 user_send_changed(s
->user
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
900 manager_send_changed(s
->manager
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
903 int session_get_locked_hint(Session
*s
) {
906 return s
->locked_hint
;
909 void session_set_locked_hint(Session
*s
, bool b
) {
912 if (s
->locked_hint
== b
)
917 session_send_changed(s
, "LockedHint", NULL
);
920 static int session_dispatch_fifo(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
921 Session
*s
= userdata
;
924 assert(s
->fifo_fd
== fd
);
926 /* EOF on the FIFO means the session died abnormally. */
928 session_remove_fifo(s
);
929 session_stop(s
, false);
934 int session_create_fifo(Session
*s
) {
941 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, MKDIR_WARN_MODE
);
945 if (asprintf(&s
->fifo_path
, "/run/systemd/sessions/%s.ref", s
->id
) < 0)
948 if (mkfifo(s
->fifo_path
, 0600) < 0 && errno
!= EEXIST
)
952 /* Open reading side */
953 if (s
->fifo_fd
< 0) {
954 s
->fifo_fd
= open(s
->fifo_path
, O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
);
960 if (!s
->fifo_event_source
) {
961 r
= sd_event_add_io(s
->manager
->event
, &s
->fifo_event_source
, s
->fifo_fd
, 0, session_dispatch_fifo
, s
);
965 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
967 r
= sd_event_source_set_priority(s
->fifo_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
972 /* Open writing side */
973 r
= open(s
->fifo_path
, O_WRONLY
|O_CLOEXEC
|O_NONBLOCK
);
980 static void session_remove_fifo(Session
*s
) {
983 s
->fifo_event_source
= sd_event_source_unref(s
->fifo_event_source
);
984 s
->fifo_fd
= safe_close(s
->fifo_fd
);
987 unlink(s
->fifo_path
);
988 s
->fifo_path
= mfree(s
->fifo_path
);
992 bool session_may_gc(Session
*s
, bool drop_not_started
) {
995 if (drop_not_started
&& !s
->started
)
1001 if (s
->fifo_fd
>= 0) {
1002 if (pipe_eof(s
->fifo_fd
) <= 0)
1006 if (s
->scope_job
&& manager_job_is_active(s
->manager
, s
->scope_job
))
1009 if (s
->scope
&& manager_unit_is_active(s
->manager
, s
->scope
))
1015 void session_add_to_gc_queue(Session
*s
) {
1021 LIST_PREPEND(gc_queue
, s
->manager
->session_gc_queue
, s
);
1022 s
->in_gc_queue
= true;
1025 SessionState
session_get_state(Session
*s
) {
1028 /* always check closing first */
1029 if (s
->stopping
|| s
->timer_event_source
)
1030 return SESSION_CLOSING
;
1032 if (s
->scope_job
|| s
->fifo_fd
< 0)
1033 return SESSION_OPENING
;
1035 if (session_is_active(s
))
1036 return SESSION_ACTIVE
;
1038 return SESSION_ONLINE
;
1041 int session_kill(Session
*s
, KillWho who
, int signo
) {
1047 return manager_kill_unit(s
->manager
, s
->scope
, who
, signo
, NULL
);
1050 static int session_open_vt(Session
*s
) {
1051 char path
[sizeof("/dev/tty") + DECIMAL_STR_MAX(s
->vtnr
)];
1059 sprintf(path
, "/dev/tty%u", s
->vtnr
);
1060 s
->vtfd
= open_terminal(path
, O_RDWR
| O_CLOEXEC
| O_NONBLOCK
| O_NOCTTY
);
1062 return log_error_errno(s
->vtfd
, "cannot open VT %s of session %s: %m", path
, s
->id
);
1067 int session_prepare_vt(Session
*s
) {
1069 struct vt_mode mode
= { 0 };
1074 vt
= session_open_vt(s
);
1078 r
= fchown(vt
, s
->user
->uid
, -1);
1080 r
= log_error_errno(errno
,
1081 "Cannot change owner of /dev/tty%u: %m",
1086 r
= ioctl(vt
, KDSKBMODE
, K_OFF
);
1088 r
= log_error_errno(errno
,
1089 "Cannot set K_OFF on /dev/tty%u: %m",
1094 r
= ioctl(vt
, KDSETMODE
, KD_GRAPHICS
);
1096 r
= log_error_errno(errno
,
1097 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1102 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1103 * So we need a dummy handler here which just acknowledges *all* VT
1104 * switch requests. */
1105 mode
.mode
= VT_PROCESS
;
1106 mode
.relsig
= SIGRTMIN
;
1107 mode
.acqsig
= SIGRTMIN
+ 1;
1108 r
= ioctl(vt
, VT_SETMODE
, &mode
);
1110 r
= log_error_errno(errno
,
1111 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1119 session_restore_vt(s
);
1123 void session_restore_vt(Session
*s
) {
1125 static const struct vt_mode mode
= {
1131 /* We need to get a fresh handle to the virtual terminal,
1132 * since the old file-descriptor is potentially in a hung-up
1133 * state after the controlling process exited; we do a
1134 * little dance to avoid having the terminal be available
1135 * for reuse before we've cleaned it up.
1137 old_fd
= TAKE_FD(s
->vtfd
);
1139 vt
= session_open_vt(s
);
1145 (void) ioctl(vt
, KDSETMODE
, KD_TEXT
);
1147 (void) vt_reset_keyboard(vt
);
1149 (void) ioctl(vt
, VT_SETMODE
, &mode
);
1150 (void) fchown(vt
, 0, (gid_t
) -1);
1152 s
->vtfd
= safe_close(s
->vtfd
);
1155 void session_leave_vt(Session
*s
) {
1160 /* This is called whenever we get a VT-switch signal from the kernel.
1161 * We acknowledge all of them unconditionally. Note that session are
1162 * free to overwrite those handlers and we only register them for
1163 * sessions with controllers. Legacy sessions are not affected.
1164 * However, if we switch from a non-legacy to a legacy session, we must
1165 * make sure to pause all device before acknowledging the switch. We
1166 * process the real switch only after we are notified via sysfs, so the
1167 * legacy session might have already started using the devices. If we
1168 * don't pause the devices before the switch, we might confuse the
1169 * session we switch to. */
1174 session_device_pause_all(s
);
1175 r
= ioctl(s
->vtfd
, VT_RELDISP
, 1);
1177 log_debug_errno(errno
, "Cannot release VT of session %s: %m", s
->id
);
1180 bool session_is_controller(Session
*s
, const char *sender
) {
1183 return streq_ptr(s
->controller
, sender
);
1186 static void session_release_controller(Session
*s
, bool notify
) {
1187 _cleanup_free_
char *name
= NULL
;
1193 name
= s
->controller
;
1195 /* By resetting the controller before releasing the devices, we won't
1196 * send notification signals. This avoids sending useless notifications
1197 * if the controller is released on disconnects. */
1199 s
->controller
= NULL
;
1201 while ((sd
= hashmap_first(s
->devices
)))
1202 session_device_free(sd
);
1204 s
->controller
= NULL
;
1205 s
->track
= sd_bus_track_unref(s
->track
);
1208 static int on_bus_track(sd_bus_track
*track
, void *userdata
) {
1209 Session
*s
= userdata
;
1214 session_drop_controller(s
);
1219 int session_set_controller(Session
*s
, const char *sender
, bool force
, bool prepare
) {
1220 _cleanup_free_
char *name
= NULL
;
1226 if (session_is_controller(s
, sender
))
1228 if (s
->controller
&& !force
)
1231 name
= strdup(sender
);
1235 s
->track
= sd_bus_track_unref(s
->track
);
1236 r
= sd_bus_track_new(s
->manager
->bus
, &s
->track
, on_bus_track
, s
);
1240 r
= sd_bus_track_add_name(s
->track
, name
);
1244 /* When setting a session controller, we forcibly mute the VT and set
1245 * it into graphics-mode. Applications can override that by changing
1246 * VT state after calling TakeControl(). However, this serves as a good
1247 * default and well-behaving controllers can now ignore VTs entirely.
1248 * Note that we reset the VT on ReleaseControl() and if the controller
1250 * If logind crashes/restarts, we restore the controller during restart
1251 * (without preparing the VT since the controller has probably overridden
1252 * VT state by now) or reset the VT in case it crashed/exited, too. */
1254 r
= session_prepare_vt(s
);
1256 s
->track
= sd_bus_track_unref(s
->track
);
1261 session_release_controller(s
, true);
1262 s
->controller
= TAKE_PTR(name
);
1268 void session_drop_controller(Session
*s
) {
1274 s
->track
= sd_bus_track_unref(s
->track
);
1275 session_release_controller(s
, false);
1277 session_restore_vt(s
);
1280 static const char* const session_state_table
[_SESSION_STATE_MAX
] = {
1281 [SESSION_OPENING
] = "opening",
1282 [SESSION_ONLINE
] = "online",
1283 [SESSION_ACTIVE
] = "active",
1284 [SESSION_CLOSING
] = "closing"
1287 DEFINE_STRING_TABLE_LOOKUP(session_state
, SessionState
);
1289 static const char* const session_type_table
[_SESSION_TYPE_MAX
] = {
1290 [SESSION_UNSPECIFIED
] = "unspecified",
1291 [SESSION_TTY
] = "tty",
1292 [SESSION_X11
] = "x11",
1293 [SESSION_WAYLAND
] = "wayland",
1294 [SESSION_MIR
] = "mir",
1295 [SESSION_WEB
] = "web",
1298 DEFINE_STRING_TABLE_LOOKUP(session_type
, SessionType
);
1300 static const char* const session_class_table
[_SESSION_CLASS_MAX
] = {
1301 [SESSION_USER
] = "user",
1302 [SESSION_GREETER
] = "greeter",
1303 [SESSION_LOCK_SCREEN
] = "lock-screen",
1304 [SESSION_BACKGROUND
] = "background"
1307 DEFINE_STRING_TABLE_LOOKUP(session_class
, SessionClass
);
1309 static const char* const kill_who_table
[_KILL_WHO_MAX
] = {
1310 [KILL_LEADER
] = "leader",
1314 DEFINE_STRING_TABLE_LOOKUP(kill_who
, KillWho
);