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 "formats-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);
70 s->devices = hashmap_new(&devt_hash_ops);
77 s->id = basename(s->state_file);
79 if (hashmap_put(m->sessions, s->id, s) < 0) {
80 hashmap_free(s->devices);
93 void session_free(Session *s) {
99 LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
101 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
103 session_remove_fifo(s);
105 session_drop_controller(s);
107 while ((sd = hashmap_first(s->devices)))
108 session_device_free(sd);
110 hashmap_free(s->devices);
113 LIST_REMOVE(sessions_by_user, s->user->sessions, s);
115 if (s->user->display == s)
116 s->user->display = NULL;
120 if (s->seat->active == s)
121 s->seat->active = NULL;
122 if (s->seat->pending_switch == s)
123 s->seat->pending_switch = NULL;
125 seat_evict_position(s->seat, s);
126 LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
130 hashmap_remove(s->manager->session_units, s->scope);
134 #if 0 /// elogind does not support systemd scope_jobs
138 sd_bus_message_unref(s->create_message);
142 free(s->remote_host);
143 free(s->remote_user);
147 hashmap_remove(s->manager->sessions, s->id);
153 void session_set_user(Session *s, User *u) {
158 LIST_PREPEND(sessions_by_user, u->sessions, s);
161 int session_save(Session *s) {
162 _cleanup_free_ char *temp_path = NULL;
163 _cleanup_fclose_ FILE *f = NULL;
174 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
178 r = fopen_temporary(s->state_file, &f, &temp_path);
184 fchmod(fileno(f), 0644);
187 "# This is private data. Do not parse.\n"
195 session_is_active(s),
196 session_state_to_string(session_get_state(s)),
200 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
203 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
206 fprintf(f, "SCOPE=%s\n", s->scope);
207 #if 0 /// elogind does not support systemd scope_jobs
209 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
213 fprintf(f, "FIFO=%s\n", s->fifo_path);
216 fprintf(f, "SEAT=%s\n", s->seat->id);
219 fprintf(f, "TTY=%s\n", s->tty);
222 fprintf(f, "DISPLAY=%s\n", s->display);
224 if (s->remote_host) {
225 _cleanup_free_ char *escaped;
227 escaped = cescape(s->remote_host);
233 fprintf(f, "REMOTE_HOST=%s\n", escaped);
236 if (s->remote_user) {
237 _cleanup_free_ char *escaped;
239 escaped = cescape(s->remote_user);
245 fprintf(f, "REMOTE_USER=%s\n", escaped);
249 _cleanup_free_ char *escaped;
251 escaped = cescape(s->service);
257 fprintf(f, "SERVICE=%s\n", escaped);
261 _cleanup_free_ char *escaped;
264 escaped = cescape(s->desktop);
270 fprintf(f, "DESKTOP=%s\n", escaped);
273 if (s->seat && seat_has_vts(s->seat))
274 fprintf(f, "VTNR=%u\n", s->vtnr);
277 fprintf(f, "POSITION=%u\n", s->position);
280 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
283 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
285 if (dual_timestamp_is_set(&s->timestamp))
287 "REALTIME="USEC_FMT"\n"
288 "MONOTONIC="USEC_FMT"\n",
289 s->timestamp.realtime,
290 s->timestamp.monotonic);
293 fprintf(f, "CONTROLLER=%s\n", s->controller);
295 r = fflush_and_check(f);
299 if (rename(temp_path, s->state_file) < 0) {
307 (void) unlink(s->state_file);
310 (void) unlink(temp_path);
312 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
316 int session_load(Session *s) {
317 _cleanup_free_ char *remote = NULL,
334 r = parse_env_file(s->state_file, NEWLINE,
337 #if 0 /// elogind does not support systemd scope_jobs
338 "SCOPE_JOB", &s->scope_job,
340 "FIFO", &s->fifo_path,
343 "DISPLAY", &s->display,
344 "REMOTE_HOST", &s->remote_host,
345 "REMOTE_USER", &s->remote_user,
346 "SERVICE", &s->service,
347 "DESKTOP", &s->desktop,
350 "POSITION", &position,
355 "REALTIME", &realtime,
356 "MONOTONIC", &monotonic,
357 "CONTROLLER", &controller,
361 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
368 log_error("UID not specified for session %s", s->id);
372 r = parse_uid(uid, &u);
374 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
378 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
380 log_error("User of session %s not known.", s->id);
384 session_set_user(s, user);
388 k = parse_boolean(remote);
394 safe_atou(vtnr, &s->vtnr);
396 if (seat && !s->seat) {
399 o = hashmap_get(s->manager->seats, seat);
401 r = seat_attach_session(o, s);
403 log_error("Cannot attach session %s to seat %s", s->id, seat);
406 if (!s->seat || !seat_has_vts(s->seat))
409 if (position && s->seat) {
412 safe_atou(position, &npos);
413 seat_claim_position(s->seat, s, npos);
417 k = parse_pid(leader, &s->leader);
419 audit_session_from_pid(s->leader, &s->audit_id);
425 t = session_type_from_string(type);
433 c = session_class_from_string(class);
438 if (state && streq(state, "closing"))
444 /* If we open an unopened pipe for reading we will not
445 get an EOF. to trigger an EOF we hence open it for
446 writing, but close it right away which then will
447 trigger the EOF. This will happen immediately if no
448 other process has the FIFO open for writing, i. e.
449 when the session died before logind (re)started. */
451 fd = session_create_fifo(s);
456 timestamp_deserialize(realtime, &s->timestamp.realtime);
458 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
461 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0)
462 session_set_controller(s, controller, false);
464 session_restore_vt(s);
470 int session_activate(Session *s) {
471 unsigned int num_pending;
479 if (s->seat->active == s)
482 /* on seats with VTs, we let VTs manage session-switching */
483 if (seat_has_vts(s->seat)) {
487 return chvt(s->vtnr);
490 /* On seats without VTs, we implement session-switching in logind. We
491 * try to pause all session-devices and wait until the session
492 * controller acknowledged them. Once all devices are asleep, we simply
493 * switch the active session and be done.
494 * We save the session we want to switch to in seat->pending_switch and
495 * seat_complete_switch() will perform the final switch. */
497 s->seat->pending_switch = s;
499 /* if no devices are running, immediately perform the session switch */
500 num_pending = session_device_try_pause_all(s);
502 seat_complete_switch(s->seat);
507 #if 0 /// UNNEEDED by elogind
508 static int session_start_scope(Session *s) {
515 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
516 char *scope, *job = NULL;
517 const char *description;
519 scope = strjoin("session-", s->id, ".scope", NULL);
523 description = strjoina("Session ", s->id, " of user ", s->user->name);
525 r = manager_start_scope(
531 "systemd-logind.service",
532 "systemd-user-sessions.service",
533 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
537 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
549 (void) hashmap_put(s->manager->session_units, s->scope, s);
554 static int session_start_cgroup(Session *s) {
559 assert(s->leader > 0);
561 /* First, create our own group */
562 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
564 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
566 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
568 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
574 int session_start(Session *s) {
585 r = user_start(s->user);
590 #if 0 /// elogind does its own session management
591 r = session_start_scope(s);
593 r = session_start_cgroup(s);
598 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
599 LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
600 "SESSION_ID=%s", s->id,
601 "USER_ID=%s", s->user->name,
602 "LEADER="PID_FMT, s->leader,
603 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
606 if (!dual_timestamp_is_set(&s->timestamp))
607 dual_timestamp_get(&s->timestamp);
610 seat_read_active_vt(s->seat);
614 user_elect_display(s->user);
623 session_send_signal(s, true);
624 user_send_changed(s->user, "Sessions", "Display", NULL);
626 if (s->seat->active == s)
627 seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL);
629 seat_send_changed(s->seat, "Sessions", NULL);
635 #if 0 /// UNNEEDED by elogind
636 static int session_stop_scope(Session *s, bool force) {
637 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
645 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
646 * that is left in in the scope is "left-over". Informing systemd about this has the benefit that it will log
647 * when killing any processes left after this point. */
648 r = manager_abandon_scope(s->manager, s->scope, &error);
650 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
652 /* Optionally, let's kill everything that's left now. */
653 if (force || manager_shall_kill(s->manager, s->user->name)) {
656 r = manager_stop_unit(s->manager, s->scope, &error, &job);
658 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
663 s->scope_job = mfree(s->scope_job);
668 static int session_stop_cgroup(Session *s, bool force) {
669 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
674 if (force || manager_shall_kill(s->manager, s->user->name)) {
675 r = session_kill(s, KILL_ALL, SIGTERM);
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 #if 0 /// elogind does not start scopes, but sessions
702 r = session_stop_scope(s, force);
704 r = session_stop_cgroup(s, force);
709 user_elect_display(s->user);
717 int session_finalize(Session *s) {
726 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
727 LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
728 "SESSION_ID=%s", s->id,
729 "USER_ID=%s", s->user->name,
730 "LEADER="PID_FMT, s->leader,
731 LOG_MESSAGE("Removed session %s.", s->id),
734 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
737 seat_evict_position(s->seat, s);
739 /* Kill session devices */
740 while ((sd = hashmap_first(s->devices)))
741 session_device_free(sd);
743 (void) unlink(s->state_file);
744 session_add_to_gc_queue(s);
745 user_add_to_gc_queue(s->user);
748 session_send_signal(s, false);
753 if (s->seat->active == s)
754 seat_set_active(s->seat, NULL);
757 seat_send_changed(s->seat, "Sessions", NULL);
761 user_send_changed(s->user, "Sessions", "Display", NULL);
766 #if 0 /// UNNEEDED by elogind
767 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
768 Session *s = userdata;
773 session_stop(s, false);
778 int session_release(Session *s) {
781 if (!s->started || s->stopping)
784 if (s->timer_event_source)
787 #if 0 /// UNNEEDED by elogind
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);
794 /* In systemd, session release is triggered by user jobs
795 dying. In elogind we don't have that so go ahead and stop
797 return session_stop(s, false);
801 bool session_is_active(Session *s) {
807 return s->seat->active == s;
810 static int get_tty_atime(const char *tty, usec_t *atime) {
811 _cleanup_free_ char *p = NULL;
817 if (!path_is_absolute(tty)) {
818 p = strappend("/dev/", tty);
823 } else if (!path_startswith(tty, "/dev/"))
826 if (lstat(tty, &st) < 0)
829 *atime = timespec_load(&st.st_atim);
833 static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
834 _cleanup_free_ char *p = NULL;
840 r = get_ctty(pid, NULL, &p);
844 return get_tty_atime(p, atime);
847 int session_get_idle_hint(Session *s, dual_timestamp *t) {
853 /* Explicit idle hint is set */
856 *t = s->idle_hint_timestamp;
861 /* Graphical sessions should really implement a real
863 if (SESSION_TYPE_IS_GRAPHICAL(s->type))
866 /* For sessions with an explicitly configured tty, let's check
869 r = get_tty_atime(s->tty, &atime);
874 /* For sessions with a leader but no explicitly configured
875 * tty, let's check the controlling tty of the leader */
877 r = get_process_ctty_atime(s->leader, &atime);
884 *t = s->idle_hint_timestamp;
890 dual_timestamp_from_realtime(t, atime);
892 n = now(CLOCK_REALTIME);
894 if (s->manager->idle_action_usec <= 0)
897 return atime + s->manager->idle_action_usec <= n;
900 void session_set_idle_hint(Session *s, bool b) {
903 if (s->idle_hint == b)
907 dual_timestamp_get(&s->idle_hint_timestamp);
909 session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
912 seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
914 user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
915 manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
918 int session_get_locked_hint(Session *s) {
921 return s->locked_hint;
924 void session_set_locked_hint(Session *s, bool b) {
927 if (s->locked_hint == b)
932 session_send_changed(s, "LockedHint", NULL);
935 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
936 Session *s = userdata;
939 assert(s->fifo_fd == fd);
941 /* EOF on the FIFO means the session died abnormally. */
943 session_remove_fifo(s);
944 session_stop(s, false);
949 int session_create_fifo(Session *s) {
956 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
960 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
963 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
967 /* Open reading side */
968 if (s->fifo_fd < 0) {
969 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
975 if (!s->fifo_event_source) {
976 r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
980 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
982 r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
987 /* Open writing side */
988 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
995 static void session_remove_fifo(Session *s) {
998 s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
999 s->fifo_fd = safe_close(s->fifo_fd);
1002 unlink(s->fifo_path);
1003 s->fifo_path = mfree(s->fifo_path);
1007 bool session_check_gc(Session *s, bool drop_not_started) {
1010 if (drop_not_started && !s->started)
1016 if (s->fifo_fd >= 0) {
1017 if (pipe_eof(s->fifo_fd) <= 0)
1021 #if 0 /// elogind supports neither scopes nor jobs
1022 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1025 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1032 void session_add_to_gc_queue(Session *s) {
1038 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1039 s->in_gc_queue = true;
1042 SessionState session_get_state(Session *s) {
1045 /* always check closing first */
1046 if (s->stopping || s->timer_event_source)
1047 return SESSION_CLOSING;
1049 #if 0 /// elogind does not support systemd scope_jobs
1050 if (s->scope_job || s->fifo_fd < 0)
1054 return SESSION_OPENING;
1056 if (session_is_active(s))
1057 return SESSION_ACTIVE;
1059 return SESSION_ONLINE;
1062 int session_kill(Session *s, KillWho who, int signo) {
1065 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1069 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1071 if (who == KILL_LEADER) {
1075 /* FIXME: verify that leader is in cgroup? */
1077 if (kill(s->leader, signo) < 0) {
1078 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1082 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1083 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1088 static int session_open_vt(Session *s) {
1089 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1097 sprintf(path, "/dev/tty%u", s->vtnr);
1098 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1100 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1105 int session_prepare_vt(Session *s) {
1107 struct vt_mode mode = { 0 };
1112 vt = session_open_vt(s);
1116 r = fchown(vt, s->user->uid, -1);
1118 r = log_error_errno(errno,
1119 "Cannot change owner of /dev/tty%u: %m",
1124 r = ioctl(vt, KDSKBMODE, K_OFF);
1126 r = log_error_errno(errno,
1127 "Cannot set K_OFF on /dev/tty%u: %m",
1132 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1134 r = log_error_errno(errno,
1135 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1140 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1141 * So we need a dummy handler here which just acknowledges *all* VT
1142 * switch requests. */
1143 mode.mode = VT_PROCESS;
1144 mode.relsig = SIGRTMIN;
1145 mode.acqsig = SIGRTMIN + 1;
1146 r = ioctl(vt, VT_SETMODE, &mode);
1148 r = log_error_errno(errno,
1149 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1157 session_restore_vt(s);
1161 void session_restore_vt(Session *s) {
1163 static const struct vt_mode mode = {
1167 _cleanup_free_ char *utf8 = NULL;
1170 /* We need to get a fresh handle to the virtual terminal,
1171 * since the old file-descriptor is potentially in a hung-up
1172 * state after the controlling process exited; we do a
1173 * little dance to avoid having the terminal be available
1174 * for reuse before we've cleaned it up.
1179 vt = session_open_vt(s);
1185 (void) ioctl(vt, KDSETMODE, KD_TEXT);
1187 if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
1192 (void) ioctl(vt, KDSKBMODE, kb);
1194 (void) ioctl(vt, VT_SETMODE, &mode);
1195 (void) fchown(vt, 0, (gid_t) -1);
1197 s->vtfd = safe_close(s->vtfd);
1200 void session_leave_vt(Session *s) {
1205 /* This is called whenever we get a VT-switch signal from the kernel.
1206 * We acknowledge all of them unconditionally. Note that session are
1207 * free to overwrite those handlers and we only register them for
1208 * sessions with controllers. Legacy sessions are not affected.
1209 * However, if we switch from a non-legacy to a legacy session, we must
1210 * make sure to pause all device before acknowledging the switch. We
1211 * process the real switch only after we are notified via sysfs, so the
1212 * legacy session might have already started using the devices. If we
1213 * don't pause the devices before the switch, we might confuse the
1214 * session we switch to. */
1219 session_device_pause_all(s);
1220 r = ioctl(s->vtfd, VT_RELDISP, 1);
1222 log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
1225 bool session_is_controller(Session *s, const char *sender) {
1228 return streq_ptr(s->controller, sender);
1231 static void session_release_controller(Session *s, bool notify) {
1232 _cleanup_free_ char *name = NULL;
1238 name = s->controller;
1240 /* By resetting the controller before releasing the devices, we won't
1241 * send notification signals. This avoids sending useless notifications
1242 * if the controller is released on disconnects. */
1244 s->controller = NULL;
1246 while ((sd = hashmap_first(s->devices)))
1247 session_device_free(sd);
1249 s->controller = NULL;
1250 s->track = sd_bus_track_unref(s->track);
1253 static int on_bus_track(sd_bus_track *track, void *userdata) {
1254 Session *s = userdata;
1259 session_drop_controller(s);
1264 int session_set_controller(Session *s, const char *sender, bool force) {
1265 _cleanup_free_ char *name = NULL;
1271 if (session_is_controller(s, sender))
1273 if (s->controller && !force)
1276 name = strdup(sender);
1280 s->track = sd_bus_track_unref(s->track);
1281 r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
1285 r = sd_bus_track_add_name(s->track, name);
1289 /* When setting a session controller, we forcibly mute the VT and set
1290 * it into graphics-mode. Applications can override that by changing
1291 * VT state after calling TakeControl(). However, this serves as a good
1292 * default and well-behaving controllers can now ignore VTs entirely.
1293 * Note that we reset the VT on ReleaseControl() and if the controller
1295 * If logind crashes/restarts, we restore the controller during restart
1296 * or reset the VT in case it crashed/exited, too. */
1297 r = session_prepare_vt(s);
1299 s->track = sd_bus_track_unref(s->track);
1303 session_release_controller(s, true);
1304 s->controller = name;
1311 void session_drop_controller(Session *s) {
1317 s->track = sd_bus_track_unref(s->track);
1318 session_release_controller(s, false);
1320 session_restore_vt(s);
1323 static const char* const session_state_table[_SESSION_STATE_MAX] = {
1324 [SESSION_OPENING] = "opening",
1325 [SESSION_ONLINE] = "online",
1326 [SESSION_ACTIVE] = "active",
1327 [SESSION_CLOSING] = "closing"
1330 DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
1332 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
1333 [SESSION_UNSPECIFIED] = "unspecified",
1334 [SESSION_TTY] = "tty",
1335 [SESSION_X11] = "x11",
1336 [SESSION_WAYLAND] = "wayland",
1337 [SESSION_MIR] = "mir",
1338 [SESSION_WEB] = "web",
1341 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
1343 static const char* const session_class_table[_SESSION_CLASS_MAX] = {
1344 [SESSION_USER] = "user",
1345 [SESSION_GREETER] = "greeter",
1346 [SESSION_LOCK_SCREEN] = "lock-screen",
1347 [SESSION_BACKGROUND] = "background"
1350 DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
1352 static const char* const kill_who_table[_KILL_WHO_MAX] = {
1353 [KILL_LEADER] = "leader",
1357 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);