1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2011 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <sys/ioctl.h>
30 #include "sd-messages.h"
32 #include "alloc-util.h"
33 #include "audit-util.h"
34 #include "bus-error.h"
39 #include "format-util.h"
41 #include "logind-session.h"
43 #include "parse-util.h"
44 #include "path-util.h"
45 #include "string-table.h"
46 #include "terminal-util.h"
47 #include "user-util.h"
49 #include "process-util.h"
51 #define RELEASE_USEC (20*USEC_PER_SEC)
53 static void session_remove_fifo(Session
*s
);
55 Session
* session_new(Manager
*m
, const char *id
) {
60 assert(session_id_valid(id
));
66 s
->state_file
= strappend("/run/systemd/sessions/", id
);
70 s
->devices
= hashmap_new(&devt_hash_ops
);
76 s
->id
= basename(s
->state_file
);
78 if (hashmap_put(m
->sessions
, s
->id
, s
) < 0) {
79 hashmap_free(s
->devices
);
87 s
->audit_id
= AUDIT_SESSION_INVALID
;
92 void session_free(Session
*s
) {
98 LIST_REMOVE(gc_queue
, s
->manager
->session_gc_queue
, s
);
100 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
102 session_remove_fifo(s
);
104 session_drop_controller(s
);
106 while ((sd
= hashmap_first(s
->devices
)))
107 session_device_free(sd
);
109 hashmap_free(s
->devices
);
112 LIST_REMOVE(sessions_by_user
, s
->user
->sessions
, s
);
114 if (s
->user
->display
== s
)
115 s
->user
->display
= NULL
;
119 if (s
->seat
->active
== s
)
120 s
->seat
->active
= NULL
;
121 if (s
->seat
->pending_switch
== s
)
122 s
->seat
->pending_switch
= NULL
;
124 seat_evict_position(s
->seat
, s
);
125 LIST_REMOVE(sessions_by_seat
, s
->seat
->sessions
, s
);
129 hashmap_remove(s
->manager
->session_units
, s
->scope
);
135 sd_bus_message_unref(s
->create_message
);
139 free(s
->remote_host
);
140 free(s
->remote_user
);
144 hashmap_remove(s
->manager
->sessions
, s
->id
);
150 void session_set_user(Session
*s
, User
*u
) {
155 LIST_PREPEND(sessions_by_user
, u
->sessions
, s
);
158 static void session_save_devices(Session
*s
, FILE *f
) {
162 if (!hashmap_isempty(s
->devices
)) {
163 fprintf(f
, "DEVICES=");
164 HASHMAP_FOREACH(sd
, s
->devices
, i
)
165 fprintf(f
, "%u:%u ", major(sd
->dev
), minor(sd
->dev
));
170 int session_save(Session
*s
) {
171 _cleanup_free_
char *temp_path
= NULL
;
172 _cleanup_fclose_
FILE *f
= NULL
;
183 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
187 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
193 fchmod(fileno(f
), 0644);
196 "# This is private data. Do not parse.\n"
204 session_is_active(s
),
205 session_state_to_string(session_get_state(s
)),
209 fprintf(f
, "TYPE=%s\n", session_type_to_string(s
->type
));
212 fprintf(f
, "CLASS=%s\n", session_class_to_string(s
->class));
215 fprintf(f
, "SCOPE=%s\n", s
->scope
);
217 fprintf(f
, "SCOPE_JOB=%s\n", s
->scope_job
);
220 fprintf(f
, "FIFO=%s\n", s
->fifo_path
);
223 fprintf(f
, "SEAT=%s\n", s
->seat
->id
);
226 fprintf(f
, "TTY=%s\n", s
->tty
);
229 fprintf(f
, "DISPLAY=%s\n", s
->display
);
231 if (s
->remote_host
) {
232 _cleanup_free_
char *escaped
;
234 escaped
= cescape(s
->remote_host
);
240 fprintf(f
, "REMOTE_HOST=%s\n", escaped
);
243 if (s
->remote_user
) {
244 _cleanup_free_
char *escaped
;
246 escaped
= cescape(s
->remote_user
);
252 fprintf(f
, "REMOTE_USER=%s\n", escaped
);
256 _cleanup_free_
char *escaped
;
258 escaped
= cescape(s
->service
);
264 fprintf(f
, "SERVICE=%s\n", escaped
);
268 _cleanup_free_
char *escaped
;
271 escaped
= cescape(s
->desktop
);
277 fprintf(f
, "DESKTOP=%s\n", escaped
);
280 if (s
->seat
&& seat_has_vts(s
->seat
))
281 fprintf(f
, "VTNR=%u\n", s
->vtnr
);
284 fprintf(f
, "POSITION=%u\n", s
->position
);
286 if (pid_is_valid(s
->leader
))
287 fprintf(f
, "LEADER="PID_FMT
"\n", s
->leader
);
289 if (audit_session_is_valid(s
->audit_id
))
290 fprintf(f
, "AUDIT=%"PRIu32
"\n", s
->audit_id
);
292 if (dual_timestamp_is_set(&s
->timestamp
))
294 "REALTIME="USEC_FMT
"\n"
295 "MONOTONIC="USEC_FMT
"\n",
296 s
->timestamp
.realtime
,
297 s
->timestamp
.monotonic
);
300 fprintf(f
, "CONTROLLER=%s\n", s
->controller
);
301 session_save_devices(s
, f
);
304 r
= fflush_and_check(f
);
308 if (rename(temp_path
, s
->state_file
) < 0) {
316 (void) unlink(s
->state_file
);
319 (void) unlink(temp_path
);
321 return log_error_errno(r
, "Failed to save session data %s: %m", s
->state_file
);
324 static int session_load_devices(Session
*s
, const char *devices
) {
330 for (p
= devices
;;) {
331 _cleanup_free_
char *word
= NULL
;
336 k
= extract_first_word(&p
, &word
, NULL
, 0);
344 k
= parse_dev(word
, &dev
);
350 /* The file descriptors for loaded devices will be reattached later. */
351 k
= session_device_new(s
, dev
, false, &sd
);
357 log_error_errno(r
, "Loading session devices for session %s failed: %m", s
->id
);
362 int session_load(Session
*s
) {
363 _cleanup_free_
char *remote
= NULL
,
382 r
= parse_env_file(s
->state_file
, NEWLINE
,
385 "SCOPE_JOB", &s
->scope_job
,
386 "FIFO", &s
->fifo_path
,
389 "DISPLAY", &s
->display
,
390 "REMOTE_HOST", &s
->remote_host
,
391 "REMOTE_USER", &s
->remote_user
,
392 "SERVICE", &s
->service
,
393 "DESKTOP", &s
->desktop
,
396 "POSITION", &position
,
401 "REALTIME", &realtime
,
402 "MONOTONIC", &monotonic
,
403 "CONTROLLER", &controller
,
409 return log_error_errno(r
, "Failed to read %s: %m", s
->state_file
);
416 log_error("UID not specified for session %s", s
->id
);
420 r
= parse_uid(uid
, &u
);
422 log_error("Failed to parse UID value %s for session %s.", uid
, s
->id
);
426 user
= hashmap_get(s
->manager
->users
, UID_TO_PTR(u
));
428 log_error("User of session %s not known.", s
->id
);
432 session_set_user(s
, user
);
436 k
= parse_boolean(remote
);
442 safe_atou(vtnr
, &s
->vtnr
);
444 if (seat
&& !s
->seat
) {
447 o
= hashmap_get(s
->manager
->seats
, seat
);
449 r
= seat_attach_session(o
, s
);
451 log_error("Cannot attach session %s to seat %s", s
->id
, seat
);
454 if (!s
->seat
|| !seat_has_vts(s
->seat
))
457 if (position
&& s
->seat
) {
460 safe_atou(position
, &npos
);
461 seat_claim_position(s
->seat
, s
, npos
);
465 if (parse_pid(leader
, &s
->leader
) >= 0)
466 (void) audit_session_from_pid(s
->leader
, &s
->audit_id
);
472 t
= session_type_from_string(type
);
480 c
= session_class_from_string(class);
485 if (state
&& streq(state
, "closing"))
491 /* If we open an unopened pipe for reading we will not
492 get an EOF. to trigger an EOF we hence open it for
493 writing, but close it right away which then will
494 trigger the EOF. This will happen immediately if no
495 other process has the FIFO open for writing, i. e.
496 when the session died before logind (re)started. */
498 fd
= session_create_fifo(s
);
503 timestamp_deserialize(realtime
, &s
->timestamp
.realtime
);
505 timestamp_deserialize(monotonic
, &s
->timestamp
.monotonic
);
508 k
= parse_boolean(active
);
514 if (bus_name_has_owner(s
->manager
->bus
, controller
, NULL
) > 0) {
515 session_set_controller(s
, controller
, false, false);
516 session_load_devices(s
, devices
);
518 session_restore_vt(s
);
524 int session_activate(Session
*s
) {
525 unsigned int num_pending
;
533 if (s
->seat
->active
== s
)
536 /* on seats with VTs, we let VTs manage session-switching */
537 if (seat_has_vts(s
->seat
)) {
541 return chvt(s
->vtnr
);
544 /* On seats without VTs, we implement session-switching in logind. We
545 * try to pause all session-devices and wait until the session
546 * controller acknowledged them. Once all devices are asleep, we simply
547 * switch the active session and be done.
548 * We save the session we want to switch to in seat->pending_switch and
549 * seat_complete_switch() will perform the final switch. */
551 s
->seat
->pending_switch
= s
;
553 /* if no devices are running, immediately perform the session switch */
554 num_pending
= session_device_try_pause_all(s
);
556 seat_complete_switch(s
->seat
);
561 static int session_start_scope(Session
*s
) {
568 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
569 char *scope
, *job
= NULL
;
570 const char *description
;
572 scope
= strjoin("session-", s
->id
, ".scope");
576 description
= strjoina("Session ", s
->id
, " of user ", s
->user
->name
);
578 r
= manager_start_scope(
584 "systemd-logind.service",
585 "systemd-user-sessions.service",
586 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
590 log_error_errno(r
, "Failed to start session scope %s: %s", scope
, bus_error_message(&error
, r
));
602 (void) hashmap_put(s
->manager
->session_units
, s
->scope
, s
);
607 int session_start(Session
*s
) {
618 r
= user_start(s
->user
);
623 r
= session_start_scope(s
);
627 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
628 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR
,
629 "SESSION_ID=%s", s
->id
,
630 "USER_ID=%s", s
->user
->name
,
631 "LEADER="PID_FMT
, s
->leader
,
632 LOG_MESSAGE("New session %s of user %s.", s
->id
, s
->user
->name
),
635 if (!dual_timestamp_is_set(&s
->timestamp
))
636 dual_timestamp_get(&s
->timestamp
);
639 seat_read_active_vt(s
->seat
);
643 user_elect_display(s
->user
);
652 session_send_signal(s
, true);
653 user_send_changed(s
->user
, "Display", NULL
);
655 if (s
->seat
->active
== s
)
656 seat_send_changed(s
->seat
, "ActiveSession", NULL
);
662 static int session_stop_scope(Session
*s
, bool force
) {
663 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
671 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
672 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
673 * when killing any processes left after this point. */
674 r
= manager_abandon_scope(s
->manager
, s
->scope
, &error
);
676 log_warning_errno(r
, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error
, r
));
678 /* Optionally, let's kill everything that's left now. */
679 if (force
|| manager_shall_kill(s
->manager
, s
->user
->name
)) {
682 r
= manager_stop_unit(s
->manager
, s
->scope
, &error
, &job
);
684 return log_error_errno(r
, "Failed to stop session scope: %s", bus_error_message(&error
, r
));
689 s
->scope_job
= mfree(s
->scope_job
);
694 int session_stop(Session
*s
, bool force
) {
702 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
705 seat_evict_position(s
->seat
, s
);
707 /* We are going down, don't care about FIFOs anymore */
708 session_remove_fifo(s
);
711 r
= session_stop_scope(s
, force
);
715 user_elect_display(s
->user
);
723 int session_finalize(Session
*s
) {
732 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
733 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR
,
734 "SESSION_ID=%s", s
->id
,
735 "USER_ID=%s", s
->user
->name
,
736 "LEADER="PID_FMT
, s
->leader
,
737 LOG_MESSAGE("Removed session %s.", s
->id
),
740 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
743 seat_evict_position(s
->seat
, s
);
745 /* Kill session devices */
746 while ((sd
= hashmap_first(s
->devices
)))
747 session_device_free(sd
);
749 (void) unlink(s
->state_file
);
750 session_add_to_gc_queue(s
);
751 user_add_to_gc_queue(s
->user
);
754 session_send_signal(s
, false);
759 if (s
->seat
->active
== s
)
760 seat_set_active(s
->seat
, NULL
);
766 user_send_changed(s
->user
, "Display", NULL
);
771 static int release_timeout_callback(sd_event_source
*es
, uint64_t usec
, void *userdata
) {
772 Session
*s
= userdata
;
777 session_stop(s
, false);
781 int session_release(Session
*s
) {
784 if (!s
->started
|| s
->stopping
)
787 if (s
->timer_event_source
)
790 return sd_event_add_time(s
->manager
->event
,
791 &s
->timer_event_source
,
793 now(CLOCK_MONOTONIC
) + RELEASE_USEC
, 0,
794 release_timeout_callback
, s
);
797 bool session_is_active(Session
*s
) {
803 return s
->seat
->active
== s
;
806 static int get_tty_atime(const char *tty
, usec_t
*atime
) {
807 _cleanup_free_
char *p
= NULL
;
813 if (!path_is_absolute(tty
)) {
814 p
= strappend("/dev/", tty
);
819 } else if (!path_startswith(tty
, "/dev/"))
822 if (lstat(tty
, &st
) < 0)
825 *atime
= timespec_load(&st
.st_atim
);
829 static int get_process_ctty_atime(pid_t pid
, usec_t
*atime
) {
830 _cleanup_free_
char *p
= NULL
;
836 r
= get_ctty(pid
, NULL
, &p
);
840 return get_tty_atime(p
, atime
);
843 int session_get_idle_hint(Session
*s
, dual_timestamp
*t
) {
849 /* Explicit idle hint is set */
852 *t
= s
->idle_hint_timestamp
;
857 /* Graphical sessions should really implement a real
859 if (SESSION_TYPE_IS_GRAPHICAL(s
->type
))
862 /* For sessions with an explicitly configured tty, let's check
865 r
= get_tty_atime(s
->tty
, &atime
);
870 /* For sessions with a leader but no explicitly configured
871 * tty, let's check the controlling tty of the leader */
873 r
= get_process_ctty_atime(s
->leader
, &atime
);
880 *t
= s
->idle_hint_timestamp
;
886 dual_timestamp_from_realtime(t
, atime
);
888 n
= now(CLOCK_REALTIME
);
890 if (s
->manager
->idle_action_usec
<= 0)
893 return atime
+ s
->manager
->idle_action_usec
<= n
;
896 void session_set_idle_hint(Session
*s
, bool b
) {
899 if (s
->idle_hint
== b
)
903 dual_timestamp_get(&s
->idle_hint_timestamp
);
905 session_send_changed(s
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
908 seat_send_changed(s
->seat
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
910 user_send_changed(s
->user
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
911 manager_send_changed(s
->manager
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
914 int session_get_locked_hint(Session
*s
) {
917 return s
->locked_hint
;
920 void session_set_locked_hint(Session
*s
, bool b
) {
923 if (s
->locked_hint
== b
)
928 session_send_changed(s
, "LockedHint", NULL
);
931 static int session_dispatch_fifo(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
932 Session
*s
= userdata
;
935 assert(s
->fifo_fd
== fd
);
937 /* EOF on the FIFO means the session died abnormally. */
939 session_remove_fifo(s
);
940 session_stop(s
, false);
945 int session_create_fifo(Session
*s
) {
952 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
956 if (asprintf(&s
->fifo_path
, "/run/systemd/sessions/%s.ref", s
->id
) < 0)
959 if (mkfifo(s
->fifo_path
, 0600) < 0 && errno
!= EEXIST
)
963 /* Open reading side */
964 if (s
->fifo_fd
< 0) {
965 s
->fifo_fd
= open(s
->fifo_path
, O_RDONLY
|O_CLOEXEC
|O_NDELAY
);
971 if (!s
->fifo_event_source
) {
972 r
= sd_event_add_io(s
->manager
->event
, &s
->fifo_event_source
, s
->fifo_fd
, 0, session_dispatch_fifo
, s
);
976 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
978 r
= sd_event_source_set_priority(s
->fifo_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
983 /* Open writing side */
984 r
= open(s
->fifo_path
, O_WRONLY
|O_CLOEXEC
|O_NDELAY
);
991 static void session_remove_fifo(Session
*s
) {
994 s
->fifo_event_source
= sd_event_source_unref(s
->fifo_event_source
);
995 s
->fifo_fd
= safe_close(s
->fifo_fd
);
998 unlink(s
->fifo_path
);
999 s
->fifo_path
= mfree(s
->fifo_path
);
1003 bool session_check_gc(Session
*s
, bool drop_not_started
) {
1006 if (drop_not_started
&& !s
->started
)
1012 if (s
->fifo_fd
>= 0) {
1013 if (pipe_eof(s
->fifo_fd
) <= 0)
1017 if (s
->scope_job
&& manager_job_is_active(s
->manager
, s
->scope_job
))
1020 if (s
->scope
&& manager_unit_is_active(s
->manager
, s
->scope
))
1026 void session_add_to_gc_queue(Session
*s
) {
1032 LIST_PREPEND(gc_queue
, s
->manager
->session_gc_queue
, s
);
1033 s
->in_gc_queue
= true;
1036 SessionState
session_get_state(Session
*s
) {
1039 /* always check closing first */
1040 if (s
->stopping
|| s
->timer_event_source
)
1041 return SESSION_CLOSING
;
1043 if (s
->scope_job
|| s
->fifo_fd
< 0)
1044 return SESSION_OPENING
;
1046 if (session_is_active(s
))
1047 return SESSION_ACTIVE
;
1049 return SESSION_ONLINE
;
1052 int session_kill(Session
*s
, KillWho who
, int signo
) {
1058 return manager_kill_unit(s
->manager
, s
->scope
, who
, signo
, NULL
);
1061 static int session_open_vt(Session
*s
) {
1062 char path
[sizeof("/dev/tty") + DECIMAL_STR_MAX(s
->vtnr
)];
1070 sprintf(path
, "/dev/tty%u", s
->vtnr
);
1071 s
->vtfd
= open_terminal(path
, O_RDWR
| O_CLOEXEC
| O_NONBLOCK
| O_NOCTTY
);
1073 return log_error_errno(s
->vtfd
, "cannot open VT %s of session %s: %m", path
, s
->id
);
1078 int session_prepare_vt(Session
*s
) {
1080 struct vt_mode mode
= { 0 };
1085 vt
= session_open_vt(s
);
1089 r
= fchown(vt
, s
->user
->uid
, -1);
1091 r
= log_error_errno(errno
,
1092 "Cannot change owner of /dev/tty%u: %m",
1097 r
= ioctl(vt
, KDSKBMODE
, K_OFF
);
1099 r
= log_error_errno(errno
,
1100 "Cannot set K_OFF on /dev/tty%u: %m",
1105 r
= ioctl(vt
, KDSETMODE
, KD_GRAPHICS
);
1107 r
= log_error_errno(errno
,
1108 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1113 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1114 * So we need a dummy handler here which just acknowledges *all* VT
1115 * switch requests. */
1116 mode
.mode
= VT_PROCESS
;
1117 mode
.relsig
= SIGRTMIN
;
1118 mode
.acqsig
= SIGRTMIN
+ 1;
1119 r
= ioctl(vt
, VT_SETMODE
, &mode
);
1121 r
= log_error_errno(errno
,
1122 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1130 session_restore_vt(s
);
1134 void session_restore_vt(Session
*s
) {
1136 static const struct vt_mode mode
= {
1142 /* We need to get a fresh handle to the virtual terminal,
1143 * since the old file-descriptor is potentially in a hung-up
1144 * state after the controlling process exited; we do a
1145 * little dance to avoid having the terminal be available
1146 * for reuse before we've cleaned it up.
1151 vt
= session_open_vt(s
);
1157 (void) ioctl(vt
, KDSETMODE
, KD_TEXT
);
1159 (void) vt_reset_keyboard(vt
);
1161 (void) ioctl(vt
, VT_SETMODE
, &mode
);
1162 (void) fchown(vt
, 0, (gid_t
) -1);
1164 s
->vtfd
= safe_close(s
->vtfd
);
1167 void session_leave_vt(Session
*s
) {
1172 /* This is called whenever we get a VT-switch signal from the kernel.
1173 * We acknowledge all of them unconditionally. Note that session are
1174 * free to overwrite those handlers and we only register them for
1175 * sessions with controllers. Legacy sessions are not affected.
1176 * However, if we switch from a non-legacy to a legacy session, we must
1177 * make sure to pause all device before acknowledging the switch. We
1178 * process the real switch only after we are notified via sysfs, so the
1179 * legacy session might have already started using the devices. If we
1180 * don't pause the devices before the switch, we might confuse the
1181 * session we switch to. */
1186 session_device_pause_all(s
);
1187 r
= ioctl(s
->vtfd
, VT_RELDISP
, 1);
1189 log_debug_errno(errno
, "Cannot release VT of session %s: %m", s
->id
);
1192 bool session_is_controller(Session
*s
, const char *sender
) {
1195 return streq_ptr(s
->controller
, sender
);
1198 static void session_release_controller(Session
*s
, bool notify
) {
1199 _cleanup_free_
char *name
= NULL
;
1205 name
= s
->controller
;
1207 /* By resetting the controller before releasing the devices, we won't
1208 * send notification signals. This avoids sending useless notifications
1209 * if the controller is released on disconnects. */
1211 s
->controller
= NULL
;
1213 while ((sd
= hashmap_first(s
->devices
)))
1214 session_device_free(sd
);
1216 s
->controller
= NULL
;
1217 s
->track
= sd_bus_track_unref(s
->track
);
1220 static int on_bus_track(sd_bus_track
*track
, void *userdata
) {
1221 Session
*s
= userdata
;
1226 session_drop_controller(s
);
1231 int session_set_controller(Session
*s
, const char *sender
, bool force
, bool prepare
) {
1232 _cleanup_free_
char *name
= NULL
;
1238 if (session_is_controller(s
, sender
))
1240 if (s
->controller
&& !force
)
1243 name
= strdup(sender
);
1247 s
->track
= sd_bus_track_unref(s
->track
);
1248 r
= sd_bus_track_new(s
->manager
->bus
, &s
->track
, on_bus_track
, s
);
1252 r
= sd_bus_track_add_name(s
->track
, name
);
1256 /* When setting a session controller, we forcibly mute the VT and set
1257 * it into graphics-mode. Applications can override that by changing
1258 * VT state after calling TakeControl(). However, this serves as a good
1259 * default and well-behaving controllers can now ignore VTs entirely.
1260 * Note that we reset the VT on ReleaseControl() and if the controller
1262 * If logind crashes/restarts, we restore the controller during restart
1263 * (without preparing the VT since the controller has probably overridden
1264 * VT state by now) or reset the VT in case it crashed/exited, too. */
1266 r
= session_prepare_vt(s
);
1268 s
->track
= sd_bus_track_unref(s
->track
);
1273 session_release_controller(s
, true);
1274 s
->controller
= name
;
1281 void session_drop_controller(Session
*s
) {
1287 s
->track
= sd_bus_track_unref(s
->track
);
1288 session_release_controller(s
, false);
1290 session_restore_vt(s
);
1293 static const char* const session_state_table
[_SESSION_STATE_MAX
] = {
1294 [SESSION_OPENING
] = "opening",
1295 [SESSION_ONLINE
] = "online",
1296 [SESSION_ACTIVE
] = "active",
1297 [SESSION_CLOSING
] = "closing"
1300 DEFINE_STRING_TABLE_LOOKUP(session_state
, SessionState
);
1302 static const char* const session_type_table
[_SESSION_TYPE_MAX
] = {
1303 [SESSION_UNSPECIFIED
] = "unspecified",
1304 [SESSION_TTY
] = "tty",
1305 [SESSION_X11
] = "x11",
1306 [SESSION_WAYLAND
] = "wayland",
1307 [SESSION_MIR
] = "mir",
1308 [SESSION_WEB
] = "web",
1311 DEFINE_STRING_TABLE_LOOKUP(session_type
, SessionType
);
1313 static const char* const session_class_table
[_SESSION_CLASS_MAX
] = {
1314 [SESSION_USER
] = "user",
1315 [SESSION_GREETER
] = "greeter",
1316 [SESSION_LOCK_SCREEN
] = "lock-screen",
1317 [SESSION_BACKGROUND
] = "background"
1320 DEFINE_STRING_TABLE_LOOKUP(session_class
, SessionClass
);
1322 static const char* const kill_who_table
[_KILL_WHO_MAX
] = {
1323 [KILL_LEADER
] = "leader",
1327 DEFINE_STRING_TABLE_LOOKUP(kill_who
, KillWho
);