2 This file is part of systemd.
4 Copyright 2011 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/ioctl.h>
29 #include "sd-messages.h"
31 #include "alloc-util.h"
32 #include "audit-util.h"
33 #include "bus-error.h"
38 #include "format-util.h"
40 #include "logind-session.h"
42 #include "parse-util.h"
43 #include "path-util.h"
44 #include "string-table.h"
45 #include "terminal-util.h"
46 #include "user-util.h"
49 #define RELEASE_USEC (20*USEC_PER_SEC)
51 static void session_remove_fifo(Session
*s
);
53 Session
* session_new(Manager
*m
, const char *id
) {
58 assert(session_id_valid(id
));
64 s
->state_file
= strappend("/run/systemd/sessions/", id
);
68 s
->devices
= hashmap_new(&devt_hash_ops
);
74 s
->id
= basename(s
->state_file
);
76 if (hashmap_put(m
->sessions
, s
->id
, s
) < 0) {
77 hashmap_free(s
->devices
);
85 s
->audit_id
= AUDIT_SESSION_INVALID
;
90 void session_free(Session
*s
) {
96 LIST_REMOVE(gc_queue
, s
->manager
->session_gc_queue
, s
);
98 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
100 session_remove_fifo(s
);
102 session_drop_controller(s
);
104 while ((sd
= hashmap_first(s
->devices
)))
105 session_device_free(sd
);
107 hashmap_free(s
->devices
);
110 LIST_REMOVE(sessions_by_user
, s
->user
->sessions
, s
);
112 if (s
->user
->display
== s
)
113 s
->user
->display
= NULL
;
117 if (s
->seat
->active
== s
)
118 s
->seat
->active
= NULL
;
119 if (s
->seat
->pending_switch
== s
)
120 s
->seat
->pending_switch
= NULL
;
122 seat_evict_position(s
->seat
, s
);
123 LIST_REMOVE(sessions_by_seat
, s
->seat
->sessions
, s
);
127 hashmap_remove(s
->manager
->session_units
, s
->scope
);
133 sd_bus_message_unref(s
->create_message
);
137 free(s
->remote_host
);
138 free(s
->remote_user
);
142 hashmap_remove(s
->manager
->sessions
, s
->id
);
148 void session_set_user(Session
*s
, User
*u
) {
153 LIST_PREPEND(sessions_by_user
, u
->sessions
, s
);
156 static void session_save_devices(Session
*s
, FILE *f
) {
160 if (!hashmap_isempty(s
->devices
)) {
161 fprintf(f
, "DEVICES=");
162 HASHMAP_FOREACH(sd
, s
->devices
, i
)
163 fprintf(f
, "%u:%u ", major(sd
->dev
), minor(sd
->dev
));
168 int session_save(Session
*s
) {
169 _cleanup_free_
char *temp_path
= NULL
;
170 _cleanup_fclose_
FILE *f
= NULL
;
181 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
185 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
191 fchmod(fileno(f
), 0644);
194 "# This is private data. Do not parse.\n"
202 session_is_active(s
),
203 session_state_to_string(session_get_state(s
)),
207 fprintf(f
, "TYPE=%s\n", session_type_to_string(s
->type
));
210 fprintf(f
, "CLASS=%s\n", session_class_to_string(s
->class));
213 fprintf(f
, "SCOPE=%s\n", s
->scope
);
215 fprintf(f
, "SCOPE_JOB=%s\n", s
->scope_job
);
218 fprintf(f
, "FIFO=%s\n", s
->fifo_path
);
221 fprintf(f
, "SEAT=%s\n", s
->seat
->id
);
224 fprintf(f
, "TTY=%s\n", s
->tty
);
227 fprintf(f
, "DISPLAY=%s\n", s
->display
);
229 if (s
->remote_host
) {
230 _cleanup_free_
char *escaped
;
232 escaped
= cescape(s
->remote_host
);
238 fprintf(f
, "REMOTE_HOST=%s\n", escaped
);
241 if (s
->remote_user
) {
242 _cleanup_free_
char *escaped
;
244 escaped
= cescape(s
->remote_user
);
250 fprintf(f
, "REMOTE_USER=%s\n", escaped
);
254 _cleanup_free_
char *escaped
;
256 escaped
= cescape(s
->service
);
262 fprintf(f
, "SERVICE=%s\n", escaped
);
266 _cleanup_free_
char *escaped
;
269 escaped
= cescape(s
->desktop
);
275 fprintf(f
, "DESKTOP=%s\n", escaped
);
278 if (s
->seat
&& seat_has_vts(s
->seat
))
279 fprintf(f
, "VTNR=%u\n", s
->vtnr
);
282 fprintf(f
, "POSITION=%u\n", s
->position
);
285 fprintf(f
, "LEADER="PID_FMT
"\n", s
->leader
);
287 if (audit_session_is_valid(s
->audit_id
))
288 fprintf(f
, "AUDIT=%"PRIu32
"\n", s
->audit_id
);
290 if (dual_timestamp_is_set(&s
->timestamp
))
292 "REALTIME="USEC_FMT
"\n"
293 "MONOTONIC="USEC_FMT
"\n",
294 s
->timestamp
.realtime
,
295 s
->timestamp
.monotonic
);
298 fprintf(f
, "CONTROLLER=%s\n", s
->controller
);
299 session_save_devices(s
, f
);
302 r
= fflush_and_check(f
);
306 if (rename(temp_path
, s
->state_file
) < 0) {
314 (void) unlink(s
->state_file
);
317 (void) unlink(temp_path
);
319 return log_error_errno(r
, "Failed to save session data %s: %m", s
->state_file
);
322 static int session_load_devices(Session
*s
, const char *devices
) {
328 for (p
= devices
;;) {
329 _cleanup_free_
char *word
= NULL
;
334 k
= extract_first_word(&p
, &word
, NULL
, 0);
342 k
= parse_dev(word
, &dev
);
348 /* The file descriptors for loaded devices will be reattached later. */
349 k
= session_device_new(s
, dev
, false, &sd
);
355 log_error_errno(r
, "Loading session devices for session %s failed: %m", s
->id
);
360 int session_load(Session
*s
) {
361 _cleanup_free_
char *remote
= NULL
,
380 r
= parse_env_file(s
->state_file
, NEWLINE
,
383 "SCOPE_JOB", &s
->scope_job
,
384 "FIFO", &s
->fifo_path
,
387 "DISPLAY", &s
->display
,
388 "REMOTE_HOST", &s
->remote_host
,
389 "REMOTE_USER", &s
->remote_user
,
390 "SERVICE", &s
->service
,
391 "DESKTOP", &s
->desktop
,
394 "POSITION", &position
,
399 "REALTIME", &realtime
,
400 "MONOTONIC", &monotonic
,
401 "CONTROLLER", &controller
,
407 return log_error_errno(r
, "Failed to read %s: %m", s
->state_file
);
414 log_error("UID not specified for session %s", s
->id
);
418 r
= parse_uid(uid
, &u
);
420 log_error("Failed to parse UID value %s for session %s.", uid
, s
->id
);
424 user
= hashmap_get(s
->manager
->users
, UID_TO_PTR(u
));
426 log_error("User of session %s not known.", s
->id
);
430 session_set_user(s
, user
);
434 k
= parse_boolean(remote
);
440 safe_atou(vtnr
, &s
->vtnr
);
442 if (seat
&& !s
->seat
) {
445 o
= hashmap_get(s
->manager
->seats
, seat
);
447 r
= seat_attach_session(o
, s
);
449 log_error("Cannot attach session %s to seat %s", s
->id
, seat
);
452 if (!s
->seat
|| !seat_has_vts(s
->seat
))
455 if (position
&& s
->seat
) {
458 safe_atou(position
, &npos
);
459 seat_claim_position(s
->seat
, s
, npos
);
463 if (parse_pid(leader
, &s
->leader
) >= 0)
464 (void) audit_session_from_pid(s
->leader
, &s
->audit_id
);
470 t
= session_type_from_string(type
);
478 c
= session_class_from_string(class);
483 if (state
&& streq(state
, "closing"))
489 /* If we open an unopened pipe for reading we will not
490 get an EOF. to trigger an EOF we hence open it for
491 writing, but close it right away which then will
492 trigger the EOF. This will happen immediately if no
493 other process has the FIFO open for writing, i. e.
494 when the session died before logind (re)started. */
496 fd
= session_create_fifo(s
);
501 timestamp_deserialize(realtime
, &s
->timestamp
.realtime
);
503 timestamp_deserialize(monotonic
, &s
->timestamp
.monotonic
);
506 k
= parse_boolean(active
);
512 if (bus_name_has_owner(s
->manager
->bus
, controller
, NULL
) > 0) {
513 session_set_controller(s
, controller
, false, false);
514 session_load_devices(s
, devices
);
516 session_restore_vt(s
);
522 int session_activate(Session
*s
) {
523 unsigned int num_pending
;
531 if (s
->seat
->active
== s
)
534 /* on seats with VTs, we let VTs manage session-switching */
535 if (seat_has_vts(s
->seat
)) {
539 return chvt(s
->vtnr
);
542 /* On seats without VTs, we implement session-switching in logind. We
543 * try to pause all session-devices and wait until the session
544 * controller acknowledged them. Once all devices are asleep, we simply
545 * switch the active session and be done.
546 * We save the session we want to switch to in seat->pending_switch and
547 * seat_complete_switch() will perform the final switch. */
549 s
->seat
->pending_switch
= s
;
551 /* if no devices are running, immediately perform the session switch */
552 num_pending
= session_device_try_pause_all(s
);
554 seat_complete_switch(s
->seat
);
559 static int session_start_scope(Session
*s
) {
566 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
567 char *scope
, *job
= NULL
;
568 const char *description
;
570 scope
= strjoin("session-", s
->id
, ".scope");
574 description
= strjoina("Session ", s
->id
, " of user ", s
->user
->name
);
576 r
= manager_start_scope(
582 "systemd-logind.service",
583 "systemd-user-sessions.service",
584 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
588 log_error_errno(r
, "Failed to start session scope %s: %s", scope
, bus_error_message(&error
, r
));
600 (void) hashmap_put(s
->manager
->session_units
, s
->scope
, s
);
605 int session_start(Session
*s
) {
616 r
= user_start(s
->user
);
621 r
= session_start_scope(s
);
625 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
626 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR
,
627 "SESSION_ID=%s", s
->id
,
628 "USER_ID=%s", s
->user
->name
,
629 "LEADER="PID_FMT
, s
->leader
,
630 LOG_MESSAGE("New session %s of user %s.", s
->id
, s
->user
->name
),
633 if (!dual_timestamp_is_set(&s
->timestamp
))
634 dual_timestamp_get(&s
->timestamp
);
637 seat_read_active_vt(s
->seat
);
641 user_elect_display(s
->user
);
650 session_send_signal(s
, true);
651 user_send_changed(s
->user
, "Display", NULL
);
653 if (s
->seat
->active
== s
)
654 seat_send_changed(s
->seat
, "ActiveSession", NULL
);
660 static int session_stop_scope(Session
*s
, bool force
) {
661 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
669 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
670 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
671 * when killing any processes left after this point. */
672 r
= manager_abandon_scope(s
->manager
, s
->scope
, &error
);
674 log_warning_errno(r
, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error
, r
));
676 /* Optionally, let's kill everything that's left now. */
677 if (force
|| manager_shall_kill(s
->manager
, s
->user
->name
)) {
680 r
= manager_stop_unit(s
->manager
, s
->scope
, &error
, &job
);
682 return log_error_errno(r
, "Failed to stop session scope: %s", bus_error_message(&error
, r
));
687 s
->scope_job
= mfree(s
->scope_job
);
692 int session_stop(Session
*s
, bool force
) {
700 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
703 seat_evict_position(s
->seat
, s
);
705 /* We are going down, don't care about FIFOs anymore */
706 session_remove_fifo(s
);
709 r
= session_stop_scope(s
, force
);
713 user_elect_display(s
->user
);
721 int session_finalize(Session
*s
) {
730 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
731 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR
,
732 "SESSION_ID=%s", s
->id
,
733 "USER_ID=%s", s
->user
->name
,
734 "LEADER="PID_FMT
, s
->leader
,
735 LOG_MESSAGE("Removed session %s.", s
->id
),
738 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
741 seat_evict_position(s
->seat
, s
);
743 /* Kill session devices */
744 while ((sd
= hashmap_first(s
->devices
)))
745 session_device_free(sd
);
747 (void) unlink(s
->state_file
);
748 session_add_to_gc_queue(s
);
749 user_add_to_gc_queue(s
->user
);
752 session_send_signal(s
, false);
757 if (s
->seat
->active
== s
)
758 seat_set_active(s
->seat
, NULL
);
764 user_send_changed(s
->user
, "Display", NULL
);
769 static int release_timeout_callback(sd_event_source
*es
, uint64_t usec
, void *userdata
) {
770 Session
*s
= userdata
;
775 session_stop(s
, false);
779 int session_release(Session
*s
) {
782 if (!s
->started
|| s
->stopping
)
785 if (s
->timer_event_source
)
788 return sd_event_add_time(s
->manager
->event
,
789 &s
->timer_event_source
,
791 now(CLOCK_MONOTONIC
) + RELEASE_USEC
, 0,
792 release_timeout_callback
, s
);
795 bool session_is_active(Session
*s
) {
801 return s
->seat
->active
== s
;
804 static int get_tty_atime(const char *tty
, usec_t
*atime
) {
805 _cleanup_free_
char *p
= NULL
;
811 if (!path_is_absolute(tty
)) {
812 p
= strappend("/dev/", tty
);
817 } else if (!path_startswith(tty
, "/dev/"))
820 if (lstat(tty
, &st
) < 0)
823 *atime
= timespec_load(&st
.st_atim
);
827 static int get_process_ctty_atime(pid_t pid
, usec_t
*atime
) {
828 _cleanup_free_
char *p
= NULL
;
834 r
= get_ctty(pid
, NULL
, &p
);
838 return get_tty_atime(p
, atime
);
841 int session_get_idle_hint(Session
*s
, dual_timestamp
*t
) {
847 /* Explicit idle hint is set */
850 *t
= s
->idle_hint_timestamp
;
855 /* Graphical sessions should really implement a real
857 if (SESSION_TYPE_IS_GRAPHICAL(s
->type
))
860 /* For sessions with an explicitly configured tty, let's check
863 r
= get_tty_atime(s
->tty
, &atime
);
868 /* For sessions with a leader but no explicitly configured
869 * tty, let's check the controlling tty of the leader */
871 r
= get_process_ctty_atime(s
->leader
, &atime
);
878 *t
= s
->idle_hint_timestamp
;
884 dual_timestamp_from_realtime(t
, atime
);
886 n
= now(CLOCK_REALTIME
);
888 if (s
->manager
->idle_action_usec
<= 0)
891 return atime
+ s
->manager
->idle_action_usec
<= n
;
894 void session_set_idle_hint(Session
*s
, bool b
) {
897 if (s
->idle_hint
== b
)
901 dual_timestamp_get(&s
->idle_hint_timestamp
);
903 session_send_changed(s
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
906 seat_send_changed(s
->seat
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
908 user_send_changed(s
->user
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
909 manager_send_changed(s
->manager
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
912 int session_get_locked_hint(Session
*s
) {
915 return s
->locked_hint
;
918 void session_set_locked_hint(Session
*s
, bool b
) {
921 if (s
->locked_hint
== b
)
926 session_send_changed(s
, "LockedHint", NULL
);
929 static int session_dispatch_fifo(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
930 Session
*s
= userdata
;
933 assert(s
->fifo_fd
== fd
);
935 /* EOF on the FIFO means the session died abnormally. */
937 session_remove_fifo(s
);
938 session_stop(s
, false);
943 int session_create_fifo(Session
*s
) {
950 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
954 if (asprintf(&s
->fifo_path
, "/run/systemd/sessions/%s.ref", s
->id
) < 0)
957 if (mkfifo(s
->fifo_path
, 0600) < 0 && errno
!= EEXIST
)
961 /* Open reading side */
962 if (s
->fifo_fd
< 0) {
963 s
->fifo_fd
= open(s
->fifo_path
, O_RDONLY
|O_CLOEXEC
|O_NDELAY
);
969 if (!s
->fifo_event_source
) {
970 r
= sd_event_add_io(s
->manager
->event
, &s
->fifo_event_source
, s
->fifo_fd
, 0, session_dispatch_fifo
, s
);
974 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
976 r
= sd_event_source_set_priority(s
->fifo_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
981 /* Open writing side */
982 r
= open(s
->fifo_path
, O_WRONLY
|O_CLOEXEC
|O_NDELAY
);
989 static void session_remove_fifo(Session
*s
) {
992 s
->fifo_event_source
= sd_event_source_unref(s
->fifo_event_source
);
993 s
->fifo_fd
= safe_close(s
->fifo_fd
);
996 unlink(s
->fifo_path
);
997 s
->fifo_path
= mfree(s
->fifo_path
);
1001 bool session_check_gc(Session
*s
, bool drop_not_started
) {
1004 if (drop_not_started
&& !s
->started
)
1010 if (s
->fifo_fd
>= 0) {
1011 if (pipe_eof(s
->fifo_fd
) <= 0)
1015 if (s
->scope_job
&& manager_job_is_active(s
->manager
, s
->scope_job
))
1018 if (s
->scope
&& manager_unit_is_active(s
->manager
, s
->scope
))
1024 void session_add_to_gc_queue(Session
*s
) {
1030 LIST_PREPEND(gc_queue
, s
->manager
->session_gc_queue
, s
);
1031 s
->in_gc_queue
= true;
1034 SessionState
session_get_state(Session
*s
) {
1037 /* always check closing first */
1038 if (s
->stopping
|| s
->timer_event_source
)
1039 return SESSION_CLOSING
;
1041 if (s
->scope_job
|| s
->fifo_fd
< 0)
1042 return SESSION_OPENING
;
1044 if (session_is_active(s
))
1045 return SESSION_ACTIVE
;
1047 return SESSION_ONLINE
;
1050 int session_kill(Session
*s
, KillWho who
, int signo
) {
1056 return manager_kill_unit(s
->manager
, s
->scope
, who
, signo
, NULL
);
1059 static int session_open_vt(Session
*s
) {
1060 char path
[sizeof("/dev/tty") + DECIMAL_STR_MAX(s
->vtnr
)];
1068 sprintf(path
, "/dev/tty%u", s
->vtnr
);
1069 s
->vtfd
= open_terminal(path
, O_RDWR
| O_CLOEXEC
| O_NONBLOCK
| O_NOCTTY
);
1071 return log_error_errno(s
->vtfd
, "cannot open VT %s of session %s: %m", path
, s
->id
);
1076 int session_prepare_vt(Session
*s
) {
1078 struct vt_mode mode
= { 0 };
1083 vt
= session_open_vt(s
);
1087 r
= fchown(vt
, s
->user
->uid
, -1);
1089 r
= log_error_errno(errno
,
1090 "Cannot change owner of /dev/tty%u: %m",
1095 r
= ioctl(vt
, KDSKBMODE
, K_OFF
);
1097 r
= log_error_errno(errno
,
1098 "Cannot set K_OFF on /dev/tty%u: %m",
1103 r
= ioctl(vt
, KDSETMODE
, KD_GRAPHICS
);
1105 r
= log_error_errno(errno
,
1106 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1111 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1112 * So we need a dummy handler here which just acknowledges *all* VT
1113 * switch requests. */
1114 mode
.mode
= VT_PROCESS
;
1115 mode
.relsig
= SIGRTMIN
;
1116 mode
.acqsig
= SIGRTMIN
+ 1;
1117 r
= ioctl(vt
, VT_SETMODE
, &mode
);
1119 r
= log_error_errno(errno
,
1120 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1128 session_restore_vt(s
);
1132 void session_restore_vt(Session
*s
) {
1134 static const struct vt_mode mode
= {
1138 _cleanup_free_
char *utf8
= NULL
;
1141 /* We need to get a fresh handle to the virtual terminal,
1142 * since the old file-descriptor is potentially in a hung-up
1143 * state after the controlling process exited; we do a
1144 * little dance to avoid having the terminal be available
1145 * for reuse before we've cleaned it up.
1150 vt
= session_open_vt(s
);
1156 (void) ioctl(vt
, KDSETMODE
, KD_TEXT
);
1158 if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8
) >= 0 && *utf8
== '1')
1163 (void) ioctl(vt
, KDSKBMODE
, kb
);
1165 (void) ioctl(vt
, VT_SETMODE
, &mode
);
1166 (void) fchown(vt
, 0, (gid_t
) -1);
1168 s
->vtfd
= safe_close(s
->vtfd
);
1171 void session_leave_vt(Session
*s
) {
1176 /* This is called whenever we get a VT-switch signal from the kernel.
1177 * We acknowledge all of them unconditionally. Note that session are
1178 * free to overwrite those handlers and we only register them for
1179 * sessions with controllers. Legacy sessions are not affected.
1180 * However, if we switch from a non-legacy to a legacy session, we must
1181 * make sure to pause all device before acknowledging the switch. We
1182 * process the real switch only after we are notified via sysfs, so the
1183 * legacy session might have already started using the devices. If we
1184 * don't pause the devices before the switch, we might confuse the
1185 * session we switch to. */
1190 session_device_pause_all(s
);
1191 r
= ioctl(s
->vtfd
, VT_RELDISP
, 1);
1193 log_debug_errno(errno
, "Cannot release VT of session %s: %m", s
->id
);
1196 bool session_is_controller(Session
*s
, const char *sender
) {
1199 return streq_ptr(s
->controller
, sender
);
1202 static void session_release_controller(Session
*s
, bool notify
) {
1203 _cleanup_free_
char *name
= NULL
;
1209 name
= s
->controller
;
1211 /* By resetting the controller before releasing the devices, we won't
1212 * send notification signals. This avoids sending useless notifications
1213 * if the controller is released on disconnects. */
1215 s
->controller
= NULL
;
1217 while ((sd
= hashmap_first(s
->devices
)))
1218 session_device_free(sd
);
1220 s
->controller
= NULL
;
1221 s
->track
= sd_bus_track_unref(s
->track
);
1224 static int on_bus_track(sd_bus_track
*track
, void *userdata
) {
1225 Session
*s
= userdata
;
1230 session_drop_controller(s
);
1235 int session_set_controller(Session
*s
, const char *sender
, bool force
, bool prepare
) {
1236 _cleanup_free_
char *name
= NULL
;
1242 if (session_is_controller(s
, sender
))
1244 if (s
->controller
&& !force
)
1247 name
= strdup(sender
);
1251 s
->track
= sd_bus_track_unref(s
->track
);
1252 r
= sd_bus_track_new(s
->manager
->bus
, &s
->track
, on_bus_track
, s
);
1256 r
= sd_bus_track_add_name(s
->track
, name
);
1260 /* When setting a session controller, we forcibly mute the VT and set
1261 * it into graphics-mode. Applications can override that by changing
1262 * VT state after calling TakeControl(). However, this serves as a good
1263 * default and well-behaving controllers can now ignore VTs entirely.
1264 * Note that we reset the VT on ReleaseControl() and if the controller
1266 * If logind crashes/restarts, we restore the controller during restart
1267 * (without preparing the VT since the controller has probably overridden
1268 * VT state by now) or reset the VT in case it crashed/exited, too. */
1270 r
= session_prepare_vt(s
);
1272 s
->track
= sd_bus_track_unref(s
->track
);
1277 session_release_controller(s
, true);
1278 s
->controller
= name
;
1285 void session_drop_controller(Session
*s
) {
1291 s
->track
= sd_bus_track_unref(s
->track
);
1292 session_release_controller(s
, false);
1294 session_restore_vt(s
);
1297 static const char* const session_state_table
[_SESSION_STATE_MAX
] = {
1298 [SESSION_OPENING
] = "opening",
1299 [SESSION_ONLINE
] = "online",
1300 [SESSION_ACTIVE
] = "active",
1301 [SESSION_CLOSING
] = "closing"
1304 DEFINE_STRING_TABLE_LOOKUP(session_state
, SessionState
);
1306 static const char* const session_type_table
[_SESSION_TYPE_MAX
] = {
1307 [SESSION_UNSPECIFIED
] = "unspecified",
1308 [SESSION_TTY
] = "tty",
1309 [SESSION_X11
] = "x11",
1310 [SESSION_WAYLAND
] = "wayland",
1311 [SESSION_MIR
] = "mir",
1312 [SESSION_WEB
] = "web",
1315 DEFINE_STRING_TABLE_LOOKUP(session_type
, SessionType
);
1317 static const char* const session_class_table
[_SESSION_CLASS_MAX
] = {
1318 [SESSION_USER
] = "user",
1319 [SESSION_GREETER
] = "greeter",
1320 [SESSION_LOCK_SCREEN
] = "lock-screen",
1321 [SESSION_BACKGROUND
] = "background"
1324 DEFINE_STRING_TABLE_LOOKUP(session_class
, SessionClass
);
1326 static const char* const kill_who_table
[_KILL_WHO_MAX
] = {
1327 [KILL_LEADER
] = "leader",
1331 DEFINE_STRING_TABLE_LOOKUP(kill_who
, KillWho
);