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"
48 #include "process-util.h"
50 #define RELEASE_USEC (20*USEC_PER_SEC)
52 static void session_remove_fifo(Session
*s
);
54 Session
* session_new(Manager
*m
, const char *id
) {
59 assert(session_id_valid(id
));
65 s
->state_file
= strappend("/run/systemd/sessions/", id
);
69 s
->devices
= hashmap_new(&devt_hash_ops
);
75 s
->id
= basename(s
->state_file
);
77 if (hashmap_put(m
->sessions
, s
->id
, s
) < 0) {
78 hashmap_free(s
->devices
);
86 s
->audit_id
= AUDIT_SESSION_INVALID
;
91 void session_free(Session
*s
) {
97 LIST_REMOVE(gc_queue
, s
->manager
->session_gc_queue
, s
);
99 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
101 session_remove_fifo(s
);
103 session_drop_controller(s
);
105 while ((sd
= hashmap_first(s
->devices
)))
106 session_device_free(sd
);
108 hashmap_free(s
->devices
);
111 LIST_REMOVE(sessions_by_user
, s
->user
->sessions
, s
);
113 if (s
->user
->display
== s
)
114 s
->user
->display
= NULL
;
118 if (s
->seat
->active
== s
)
119 s
->seat
->active
= NULL
;
120 if (s
->seat
->pending_switch
== s
)
121 s
->seat
->pending_switch
= NULL
;
123 seat_evict_position(s
->seat
, s
);
124 LIST_REMOVE(sessions_by_seat
, s
->seat
->sessions
, s
);
128 hashmap_remove(s
->manager
->session_units
, s
->scope
);
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
);
149 void session_set_user(Session
*s
, User
*u
) {
154 LIST_PREPEND(sessions_by_user
, u
->sessions
, s
);
157 static void session_save_devices(Session
*s
, FILE *f
) {
161 if (!hashmap_isempty(s
->devices
)) {
162 fprintf(f
, "DEVICES=");
163 HASHMAP_FOREACH(sd
, s
->devices
, i
)
164 fprintf(f
, "%u:%u ", major(sd
->dev
), minor(sd
->dev
));
169 int session_save(Session
*s
) {
170 _cleanup_free_
char *temp_path
= NULL
;
171 _cleanup_fclose_
FILE *f
= NULL
;
182 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
186 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
192 fchmod(fileno(f
), 0644);
195 "# This is private data. Do not parse.\n"
203 session_is_active(s
),
204 session_state_to_string(session_get_state(s
)),
208 fprintf(f
, "TYPE=%s\n", session_type_to_string(s
->type
));
211 fprintf(f
, "CLASS=%s\n", session_class_to_string(s
->class));
214 fprintf(f
, "SCOPE=%s\n", s
->scope
);
216 fprintf(f
, "SCOPE_JOB=%s\n", s
->scope_job
);
219 fprintf(f
, "FIFO=%s\n", s
->fifo_path
);
222 fprintf(f
, "SEAT=%s\n", s
->seat
->id
);
225 fprintf(f
, "TTY=%s\n", s
->tty
);
228 fprintf(f
, "DISPLAY=%s\n", s
->display
);
230 if (s
->remote_host
) {
231 _cleanup_free_
char *escaped
;
233 escaped
= cescape(s
->remote_host
);
239 fprintf(f
, "REMOTE_HOST=%s\n", escaped
);
242 if (s
->remote_user
) {
243 _cleanup_free_
char *escaped
;
245 escaped
= cescape(s
->remote_user
);
251 fprintf(f
, "REMOTE_USER=%s\n", escaped
);
255 _cleanup_free_
char *escaped
;
257 escaped
= cescape(s
->service
);
263 fprintf(f
, "SERVICE=%s\n", escaped
);
267 _cleanup_free_
char *escaped
;
270 escaped
= cescape(s
->desktop
);
276 fprintf(f
, "DESKTOP=%s\n", escaped
);
279 if (s
->seat
&& seat_has_vts(s
->seat
))
280 fprintf(f
, "VTNR=%u\n", s
->vtnr
);
283 fprintf(f
, "POSITION=%u\n", s
->position
);
285 if (pid_is_valid(s
->leader
))
286 fprintf(f
, "LEADER="PID_FMT
"\n", s
->leader
);
288 if (audit_session_is_valid(s
->audit_id
))
289 fprintf(f
, "AUDIT=%"PRIu32
"\n", s
->audit_id
);
291 if (dual_timestamp_is_set(&s
->timestamp
))
293 "REALTIME="USEC_FMT
"\n"
294 "MONOTONIC="USEC_FMT
"\n",
295 s
->timestamp
.realtime
,
296 s
->timestamp
.monotonic
);
299 fprintf(f
, "CONTROLLER=%s\n", s
->controller
);
300 session_save_devices(s
, f
);
303 r
= fflush_and_check(f
);
307 if (rename(temp_path
, s
->state_file
) < 0) {
315 (void) unlink(s
->state_file
);
318 (void) unlink(temp_path
);
320 return log_error_errno(r
, "Failed to save session data %s: %m", s
->state_file
);
323 static int session_load_devices(Session
*s
, const char *devices
) {
329 for (p
= devices
;;) {
330 _cleanup_free_
char *word
= NULL
;
335 k
= extract_first_word(&p
, &word
, NULL
, 0);
343 k
= parse_dev(word
, &dev
);
349 /* The file descriptors for loaded devices will be reattached later. */
350 k
= session_device_new(s
, dev
, false, &sd
);
356 log_error_errno(r
, "Loading session devices for session %s failed: %m", s
->id
);
361 int session_load(Session
*s
) {
362 _cleanup_free_
char *remote
= NULL
,
381 r
= parse_env_file(s
->state_file
, NEWLINE
,
384 "SCOPE_JOB", &s
->scope_job
,
385 "FIFO", &s
->fifo_path
,
388 "DISPLAY", &s
->display
,
389 "REMOTE_HOST", &s
->remote_host
,
390 "REMOTE_USER", &s
->remote_user
,
391 "SERVICE", &s
->service
,
392 "DESKTOP", &s
->desktop
,
395 "POSITION", &position
,
400 "REALTIME", &realtime
,
401 "MONOTONIC", &monotonic
,
402 "CONTROLLER", &controller
,
408 return log_error_errno(r
, "Failed to read %s: %m", s
->state_file
);
415 log_error("UID not specified for session %s", s
->id
);
419 r
= parse_uid(uid
, &u
);
421 log_error("Failed to parse UID value %s for session %s.", uid
, s
->id
);
425 user
= hashmap_get(s
->manager
->users
, UID_TO_PTR(u
));
427 log_error("User of session %s not known.", s
->id
);
431 session_set_user(s
, user
);
435 k
= parse_boolean(remote
);
441 safe_atou(vtnr
, &s
->vtnr
);
443 if (seat
&& !s
->seat
) {
446 o
= hashmap_get(s
->manager
->seats
, seat
);
448 r
= seat_attach_session(o
, s
);
450 log_error("Cannot attach session %s to seat %s", s
->id
, seat
);
453 if (!s
->seat
|| !seat_has_vts(s
->seat
))
456 if (position
&& s
->seat
) {
459 safe_atou(position
, &npos
);
460 seat_claim_position(s
->seat
, s
, npos
);
464 if (parse_pid(leader
, &s
->leader
) >= 0)
465 (void) audit_session_from_pid(s
->leader
, &s
->audit_id
);
471 t
= session_type_from_string(type
);
479 c
= session_class_from_string(class);
484 if (state
&& streq(state
, "closing"))
490 /* If we open an unopened pipe for reading we will not
491 get an EOF. to trigger an EOF we hence open it for
492 writing, but close it right away which then will
493 trigger the EOF. This will happen immediately if no
494 other process has the FIFO open for writing, i. e.
495 when the session died before logind (re)started. */
497 fd
= session_create_fifo(s
);
502 timestamp_deserialize(realtime
, &s
->timestamp
.realtime
);
504 timestamp_deserialize(monotonic
, &s
->timestamp
.monotonic
);
507 k
= parse_boolean(active
);
513 if (bus_name_has_owner(s
->manager
->bus
, controller
, NULL
) > 0) {
514 session_set_controller(s
, controller
, false, false);
515 session_load_devices(s
, devices
);
517 session_restore_vt(s
);
523 int session_activate(Session
*s
) {
524 unsigned int num_pending
;
532 if (s
->seat
->active
== s
)
535 /* on seats with VTs, we let VTs manage session-switching */
536 if (seat_has_vts(s
->seat
)) {
540 return chvt(s
->vtnr
);
543 /* On seats without VTs, we implement session-switching in logind. We
544 * try to pause all session-devices and wait until the session
545 * controller acknowledged them. Once all devices are asleep, we simply
546 * switch the active session and be done.
547 * We save the session we want to switch to in seat->pending_switch and
548 * seat_complete_switch() will perform the final switch. */
550 s
->seat
->pending_switch
= s
;
552 /* if no devices are running, immediately perform the session switch */
553 num_pending
= session_device_try_pause_all(s
);
555 seat_complete_switch(s
->seat
);
560 static int session_start_scope(Session
*s
) {
567 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
568 char *scope
, *job
= NULL
;
569 const char *description
;
571 scope
= strjoin("session-", s
->id
, ".scope");
575 description
= strjoina("Session ", s
->id
, " of user ", s
->user
->name
);
577 r
= manager_start_scope(
583 "systemd-logind.service",
584 "systemd-user-sessions.service",
585 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
589 log_error_errno(r
, "Failed to start session scope %s: %s", scope
, bus_error_message(&error
, r
));
601 (void) hashmap_put(s
->manager
->session_units
, s
->scope
, s
);
606 int session_start(Session
*s
) {
617 r
= user_start(s
->user
);
622 r
= session_start_scope(s
);
626 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
627 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR
,
628 "SESSION_ID=%s", s
->id
,
629 "USER_ID=%s", s
->user
->name
,
630 "LEADER="PID_FMT
, s
->leader
,
631 LOG_MESSAGE("New session %s of user %s.", s
->id
, s
->user
->name
),
634 if (!dual_timestamp_is_set(&s
->timestamp
))
635 dual_timestamp_get(&s
->timestamp
);
638 seat_read_active_vt(s
->seat
);
642 user_elect_display(s
->user
);
651 session_send_signal(s
, true);
652 user_send_changed(s
->user
, "Display", NULL
);
654 if (s
->seat
->active
== s
)
655 seat_send_changed(s
->seat
, "ActiveSession", NULL
);
661 static int session_stop_scope(Session
*s
, bool force
) {
662 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
670 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
671 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
672 * when killing any processes left after this point. */
673 r
= manager_abandon_scope(s
->manager
, s
->scope
, &error
);
675 log_warning_errno(r
, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error
, r
));
677 /* Optionally, let's kill everything that's left now. */
678 if (force
|| manager_shall_kill(s
->manager
, s
->user
->name
)) {
681 r
= manager_stop_unit(s
->manager
, s
->scope
, &error
, &job
);
683 return log_error_errno(r
, "Failed to stop session scope: %s", bus_error_message(&error
, r
));
688 s
->scope_job
= mfree(s
->scope_job
);
693 int session_stop(Session
*s
, bool force
) {
701 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
704 seat_evict_position(s
->seat
, s
);
706 /* We are going down, don't care about FIFOs anymore */
707 session_remove_fifo(s
);
710 r
= session_stop_scope(s
, force
);
714 user_elect_display(s
->user
);
722 int session_finalize(Session
*s
) {
731 log_struct(s
->class == SESSION_BACKGROUND
? LOG_DEBUG
: LOG_INFO
,
732 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR
,
733 "SESSION_ID=%s", s
->id
,
734 "USER_ID=%s", s
->user
->name
,
735 "LEADER="PID_FMT
, s
->leader
,
736 LOG_MESSAGE("Removed session %s.", s
->id
),
739 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
742 seat_evict_position(s
->seat
, s
);
744 /* Kill session devices */
745 while ((sd
= hashmap_first(s
->devices
)))
746 session_device_free(sd
);
748 (void) unlink(s
->state_file
);
749 session_add_to_gc_queue(s
);
750 user_add_to_gc_queue(s
->user
);
753 session_send_signal(s
, false);
758 if (s
->seat
->active
== s
)
759 seat_set_active(s
->seat
, NULL
);
765 user_send_changed(s
->user
, "Display", NULL
);
770 static int release_timeout_callback(sd_event_source
*es
, uint64_t usec
, void *userdata
) {
771 Session
*s
= userdata
;
776 session_stop(s
, false);
780 int session_release(Session
*s
) {
783 if (!s
->started
|| s
->stopping
)
786 if (s
->timer_event_source
)
789 return sd_event_add_time(s
->manager
->event
,
790 &s
->timer_event_source
,
792 now(CLOCK_MONOTONIC
) + RELEASE_USEC
, 0,
793 release_timeout_callback
, s
);
796 bool session_is_active(Session
*s
) {
802 return s
->seat
->active
== s
;
805 static int get_tty_atime(const char *tty
, usec_t
*atime
) {
806 _cleanup_free_
char *p
= NULL
;
812 if (!path_is_absolute(tty
)) {
813 p
= strappend("/dev/", tty
);
818 } else if (!path_startswith(tty
, "/dev/"))
821 if (lstat(tty
, &st
) < 0)
824 *atime
= timespec_load(&st
.st_atim
);
828 static int get_process_ctty_atime(pid_t pid
, usec_t
*atime
) {
829 _cleanup_free_
char *p
= NULL
;
835 r
= get_ctty(pid
, NULL
, &p
);
839 return get_tty_atime(p
, atime
);
842 int session_get_idle_hint(Session
*s
, dual_timestamp
*t
) {
848 /* Explicit idle hint is set */
851 *t
= s
->idle_hint_timestamp
;
856 /* Graphical sessions should really implement a real
858 if (SESSION_TYPE_IS_GRAPHICAL(s
->type
))
861 /* For sessions with an explicitly configured tty, let's check
864 r
= get_tty_atime(s
->tty
, &atime
);
869 /* For sessions with a leader but no explicitly configured
870 * tty, let's check the controlling tty of the leader */
872 r
= get_process_ctty_atime(s
->leader
, &atime
);
879 *t
= s
->idle_hint_timestamp
;
885 dual_timestamp_from_realtime(t
, atime
);
887 n
= now(CLOCK_REALTIME
);
889 if (s
->manager
->idle_action_usec
<= 0)
892 return atime
+ s
->manager
->idle_action_usec
<= n
;
895 void session_set_idle_hint(Session
*s
, bool b
) {
898 if (s
->idle_hint
== b
)
902 dual_timestamp_get(&s
->idle_hint_timestamp
);
904 session_send_changed(s
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
907 seat_send_changed(s
->seat
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
909 user_send_changed(s
->user
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
910 manager_send_changed(s
->manager
, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL
);
913 int session_get_locked_hint(Session
*s
) {
916 return s
->locked_hint
;
919 void session_set_locked_hint(Session
*s
, bool b
) {
922 if (s
->locked_hint
== b
)
927 session_send_changed(s
, "LockedHint", NULL
);
930 static int session_dispatch_fifo(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
931 Session
*s
= userdata
;
934 assert(s
->fifo_fd
== fd
);
936 /* EOF on the FIFO means the session died abnormally. */
938 session_remove_fifo(s
);
939 session_stop(s
, false);
944 int session_create_fifo(Session
*s
) {
951 r
= mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
955 if (asprintf(&s
->fifo_path
, "/run/systemd/sessions/%s.ref", s
->id
) < 0)
958 if (mkfifo(s
->fifo_path
, 0600) < 0 && errno
!= EEXIST
)
962 /* Open reading side */
963 if (s
->fifo_fd
< 0) {
964 s
->fifo_fd
= open(s
->fifo_path
, O_RDONLY
|O_CLOEXEC
|O_NDELAY
);
970 if (!s
->fifo_event_source
) {
971 r
= sd_event_add_io(s
->manager
->event
, &s
->fifo_event_source
, s
->fifo_fd
, 0, session_dispatch_fifo
, s
);
975 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
977 r
= sd_event_source_set_priority(s
->fifo_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
982 /* Open writing side */
983 r
= open(s
->fifo_path
, O_WRONLY
|O_CLOEXEC
|O_NDELAY
);
990 static void session_remove_fifo(Session
*s
) {
993 s
->fifo_event_source
= sd_event_source_unref(s
->fifo_event_source
);
994 s
->fifo_fd
= safe_close(s
->fifo_fd
);
997 unlink(s
->fifo_path
);
998 s
->fifo_path
= mfree(s
->fifo_path
);
1002 bool session_check_gc(Session
*s
, bool drop_not_started
) {
1005 if (drop_not_started
&& !s
->started
)
1011 if (s
->fifo_fd
>= 0) {
1012 if (pipe_eof(s
->fifo_fd
) <= 0)
1016 if (s
->scope_job
&& manager_job_is_active(s
->manager
, s
->scope_job
))
1019 if (s
->scope
&& manager_unit_is_active(s
->manager
, s
->scope
))
1025 void session_add_to_gc_queue(Session
*s
) {
1031 LIST_PREPEND(gc_queue
, s
->manager
->session_gc_queue
, s
);
1032 s
->in_gc_queue
= true;
1035 SessionState
session_get_state(Session
*s
) {
1038 /* always check closing first */
1039 if (s
->stopping
|| s
->timer_event_source
)
1040 return SESSION_CLOSING
;
1042 if (s
->scope_job
|| s
->fifo_fd
< 0)
1043 return SESSION_OPENING
;
1045 if (session_is_active(s
))
1046 return SESSION_ACTIVE
;
1048 return SESSION_ONLINE
;
1051 int session_kill(Session
*s
, KillWho who
, int signo
) {
1057 return manager_kill_unit(s
->manager
, s
->scope
, who
, signo
, NULL
);
1060 static int session_open_vt(Session
*s
) {
1061 char path
[sizeof("/dev/tty") + DECIMAL_STR_MAX(s
->vtnr
)];
1069 sprintf(path
, "/dev/tty%u", s
->vtnr
);
1070 s
->vtfd
= open_terminal(path
, O_RDWR
| O_CLOEXEC
| O_NONBLOCK
| O_NOCTTY
);
1072 return log_error_errno(s
->vtfd
, "cannot open VT %s of session %s: %m", path
, s
->id
);
1077 int session_prepare_vt(Session
*s
) {
1079 struct vt_mode mode
= { 0 };
1084 vt
= session_open_vt(s
);
1088 r
= fchown(vt
, s
->user
->uid
, -1);
1090 r
= log_error_errno(errno
,
1091 "Cannot change owner of /dev/tty%u: %m",
1096 r
= ioctl(vt
, KDSKBMODE
, K_OFF
);
1098 r
= log_error_errno(errno
,
1099 "Cannot set K_OFF on /dev/tty%u: %m",
1104 r
= ioctl(vt
, KDSETMODE
, KD_GRAPHICS
);
1106 r
= log_error_errno(errno
,
1107 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1112 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1113 * So we need a dummy handler here which just acknowledges *all* VT
1114 * switch requests. */
1115 mode
.mode
= VT_PROCESS
;
1116 mode
.relsig
= SIGRTMIN
;
1117 mode
.acqsig
= SIGRTMIN
+ 1;
1118 r
= ioctl(vt
, VT_SETMODE
, &mode
);
1120 r
= log_error_errno(errno
,
1121 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1129 session_restore_vt(s
);
1133 void session_restore_vt(Session
*s
) {
1135 static const struct vt_mode mode
= {
1139 _cleanup_free_
char *utf8
= NULL
;
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
);