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);
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);
89 void session_free(Session *s) {
95 LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
97 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
99 session_remove_fifo(s);
101 session_drop_controller(s);
103 while ((sd = hashmap_first(s->devices)))
104 session_device_free(sd);
106 hashmap_free(s->devices);
109 LIST_REMOVE(sessions_by_user, s->user->sessions, s);
111 if (s->user->display == s)
112 s->user->display = NULL;
116 if (s->seat->active == s)
117 s->seat->active = NULL;
118 if (s->seat->pending_switch == s)
119 s->seat->pending_switch = NULL;
121 seat_evict_position(s->seat, s);
122 LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
126 hashmap_remove(s->manager->session_units, s->scope);
130 #if 0 /// elogind does not support systemd scope_jobs
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 int session_save(Session *s) {
158 _cleanup_free_ char *temp_path = NULL;
159 _cleanup_fclose_ FILE *f = NULL;
170 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
174 r = fopen_temporary(s->state_file, &f, &temp_path);
180 fchmod(fileno(f), 0644);
183 "# This is private data. Do not parse.\n"
191 session_is_active(s),
192 session_state_to_string(session_get_state(s)),
196 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
199 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
202 fprintf(f, "SCOPE=%s\n", s->scope);
203 #if 0 /// elogind does not support systemd scope_jobs
205 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
209 fprintf(f, "FIFO=%s\n", s->fifo_path);
212 fprintf(f, "SEAT=%s\n", s->seat->id);
215 fprintf(f, "TTY=%s\n", s->tty);
218 fprintf(f, "DISPLAY=%s\n", s->display);
220 if (s->remote_host) {
221 _cleanup_free_ char *escaped;
223 escaped = cescape(s->remote_host);
229 fprintf(f, "REMOTE_HOST=%s\n", escaped);
232 if (s->remote_user) {
233 _cleanup_free_ char *escaped;
235 escaped = cescape(s->remote_user);
241 fprintf(f, "REMOTE_USER=%s\n", escaped);
245 _cleanup_free_ char *escaped;
247 escaped = cescape(s->service);
253 fprintf(f, "SERVICE=%s\n", escaped);
257 _cleanup_free_ char *escaped;
260 escaped = cescape(s->desktop);
266 fprintf(f, "DESKTOP=%s\n", escaped);
269 if (s->seat && seat_has_vts(s->seat))
270 fprintf(f, "VTNR=%u\n", s->vtnr);
273 fprintf(f, "POSITION=%u\n", s->position);
276 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
279 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
281 if (dual_timestamp_is_set(&s->timestamp))
283 "REALTIME="USEC_FMT"\n"
284 "MONOTONIC="USEC_FMT"\n",
285 s->timestamp.realtime,
286 s->timestamp.monotonic);
289 fprintf(f, "CONTROLLER=%s\n", s->controller);
291 r = fflush_and_check(f);
295 if (rename(temp_path, s->state_file) < 0) {
303 (void) unlink(s->state_file);
306 (void) unlink(temp_path);
308 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
312 int session_load(Session *s) {
313 _cleanup_free_ char *remote = NULL,
330 r = parse_env_file(s->state_file, NEWLINE,
333 #if 0 /// elogind does not support systemd scope_jobs
334 "SCOPE_JOB", &s->scope_job,
336 "FIFO", &s->fifo_path,
339 "DISPLAY", &s->display,
340 "REMOTE_HOST", &s->remote_host,
341 "REMOTE_USER", &s->remote_user,
342 "SERVICE", &s->service,
343 "DESKTOP", &s->desktop,
346 "POSITION", &position,
351 "REALTIME", &realtime,
352 "MONOTONIC", &monotonic,
353 "CONTROLLER", &controller,
357 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
364 log_error("UID not specified for session %s", s->id);
368 r = parse_uid(uid, &u);
370 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
374 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
376 log_error("User of session %s not known.", s->id);
380 session_set_user(s, user);
384 k = parse_boolean(remote);
390 safe_atou(vtnr, &s->vtnr);
392 if (seat && !s->seat) {
395 o = hashmap_get(s->manager->seats, seat);
397 r = seat_attach_session(o, s);
399 log_error("Cannot attach session %s to seat %s", s->id, seat);
402 if (!s->seat || !seat_has_vts(s->seat))
405 if (position && s->seat) {
408 safe_atou(position, &npos);
409 seat_claim_position(s->seat, s, npos);
413 k = parse_pid(leader, &s->leader);
415 audit_session_from_pid(s->leader, &s->audit_id);
421 t = session_type_from_string(type);
429 c = session_class_from_string(class);
434 if (state && streq(state, "closing"))
440 /* If we open an unopened pipe for reading we will not
441 get an EOF. to trigger an EOF we hence open it for
442 writing, but close it right away which then will
443 trigger the EOF. This will happen immediately if no
444 other process has the FIFO open for writing, i. e.
445 when the session died before logind (re)started. */
447 fd = session_create_fifo(s);
452 timestamp_deserialize(realtime, &s->timestamp.realtime);
454 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
457 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0)
458 session_set_controller(s, controller, false);
460 session_restore_vt(s);
466 int session_activate(Session *s) {
467 unsigned int num_pending;
475 if (s->seat->active == s)
478 /* on seats with VTs, we let VTs manage session-switching */
479 if (seat_has_vts(s->seat)) {
483 return chvt(s->vtnr);
486 /* On seats without VTs, we implement session-switching in logind. We
487 * try to pause all session-devices and wait until the session
488 * controller acknowledged them. Once all devices are asleep, we simply
489 * switch the active session and be done.
490 * We save the session we want to switch to in seat->pending_switch and
491 * seat_complete_switch() will perform the final switch. */
493 s->seat->pending_switch = s;
495 /* if no devices are running, immediately perform the session switch */
496 num_pending = session_device_try_pause_all(s);
498 seat_complete_switch(s->seat);
503 #if 0 /// UNNEEDED by elogind
504 static int session_start_scope(Session *s) {
511 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
512 char *scope, *job = NULL;
513 const char *description;
515 scope = strjoin("session-", s->id, ".scope", NULL);
519 description = strjoina("Session ", s->id, " of user ", s->user->name);
521 r = manager_start_scope(
527 "systemd-logind.service",
528 "systemd-user-sessions.service",
529 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
533 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
545 (void) hashmap_put(s->manager->session_units, s->scope, s);
550 static int session_start_cgroup(Session *s) {
555 assert(s->leader > 0);
557 /* First, create our own group */
558 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
560 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
562 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
564 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
570 int session_start(Session *s) {
581 r = user_start(s->user);
586 #if 0 /// elogind does its own session management
587 r = session_start_scope(s);
589 r = session_start_cgroup(s);
594 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
595 LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
596 "SESSION_ID=%s", s->id,
597 "USER_ID=%s", s->user->name,
598 "LEADER="PID_FMT, s->leader,
599 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
602 if (!dual_timestamp_is_set(&s->timestamp))
603 dual_timestamp_get(&s->timestamp);
606 seat_read_active_vt(s->seat);
610 user_elect_display(s->user);
619 session_send_signal(s, true);
620 user_send_changed(s->user, "Sessions", "Display", NULL);
622 if (s->seat->active == s)
623 seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL);
625 seat_send_changed(s->seat, "Sessions", NULL);
631 #if 0 /// UNNEEDED by elogind
632 static int session_stop_scope(Session *s, bool force) {
633 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
641 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
642 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
643 * when killing any processes left after this point. */
644 r = manager_abandon_scope(s->manager, s->scope, &error);
646 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
648 /* Optionally, let's kill everything that's left now. */
649 if (force || manager_shall_kill(s->manager, s->user->name)) {
652 r = manager_stop_unit(s->manager, s->scope, &error, &job);
654 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
659 s->scope_job = mfree(s->scope_job);
664 static int session_stop_cgroup(Session *s, bool force) {
665 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
670 if (force || manager_shall_kill(s->manager, s->user->name)) {
671 r = session_kill(s, KILL_ALL, SIGTERM);
680 int session_stop(Session *s, bool force) {
688 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
691 seat_evict_position(s->seat, s);
693 /* We are going down, don't care about FIFOs anymore */
694 session_remove_fifo(s);
697 #if 0 /// elogind does not start scopes, but sessions
698 r = session_stop_scope(s, force);
700 r = session_stop_cgroup(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 LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
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),
730 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
733 seat_evict_position(s->seat, s);
735 /* Kill session devices */
736 while ((sd = hashmap_first(s->devices)))
737 session_device_free(sd);
739 (void) unlink(s->state_file);
740 session_add_to_gc_queue(s);
741 user_add_to_gc_queue(s->user);
744 session_send_signal(s, false);
749 if (s->seat->active == s)
750 seat_set_active(s->seat, NULL);
753 seat_send_changed(s->seat, "Sessions", NULL);
757 user_send_changed(s->user, "Sessions", "Display", NULL);
762 #if 0 /// UNNEEDED by elogind
763 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
764 Session *s = userdata;
769 session_stop(s, false);
774 int session_release(Session *s) {
777 if (!s->started || s->stopping)
780 if (s->timer_event_source)
783 #if 0 /// UNNEEDED by elogind
784 return sd_event_add_time(s->manager->event,
785 &s->timer_event_source,
787 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
788 release_timeout_callback, s);
790 /* In systemd, session release is triggered by user jobs
791 dying. In elogind we don't have that so go ahead and stop
793 return session_stop(s, false);
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);
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 0 /// elogind supports neither scopes nor jobs
1018 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1021 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1028 void session_add_to_gc_queue(Session *s) {
1034 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1035 s->in_gc_queue = true;
1038 SessionState session_get_state(Session *s) {
1041 /* always check closing first */
1042 if (s->stopping || s->timer_event_source)
1043 return SESSION_CLOSING;
1045 #if 0 /// elogind does not support systemd scope_jobs
1046 if (s->scope_job || s->fifo_fd < 0)
1050 return SESSION_OPENING;
1052 if (session_is_active(s))
1053 return SESSION_ACTIVE;
1055 return SESSION_ONLINE;
1058 int session_kill(Session *s, KillWho who, int signo) {
1061 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1065 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1067 if (who == KILL_LEADER) {
1071 /* FIXME: verify that leader is in cgroup? */
1073 if (kill(s->leader, signo) < 0) {
1074 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1078 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1079 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1084 static int session_open_vt(Session *s) {
1085 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1093 sprintf(path, "/dev/tty%u", s->vtnr);
1094 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1096 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1101 int session_prepare_vt(Session *s) {
1103 struct vt_mode mode = { 0 };
1108 vt = session_open_vt(s);
1112 r = fchown(vt, s->user->uid, -1);
1114 r = log_error_errno(errno,
1115 "Cannot change owner of /dev/tty%u: %m",
1120 r = ioctl(vt, KDSKBMODE, K_OFF);
1122 r = log_error_errno(errno,
1123 "Cannot set K_OFF on /dev/tty%u: %m",
1128 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1130 r = log_error_errno(errno,
1131 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1136 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1137 * So we need a dummy handler here which just acknowledges *all* VT
1138 * switch requests. */
1139 mode.mode = VT_PROCESS;
1140 mode.relsig = SIGRTMIN;
1141 mode.acqsig = SIGRTMIN + 1;
1142 r = ioctl(vt, VT_SETMODE, &mode);
1144 r = log_error_errno(errno,
1145 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1153 session_restore_vt(s);
1157 void session_restore_vt(Session *s) {
1159 static const struct vt_mode mode = {
1163 _cleanup_free_ char *utf8 = NULL;
1166 /* We need to get a fresh handle to the virtual terminal,
1167 * since the old file-descriptor is potentially in a hung-up
1168 * state after the controlling process exited; we do a
1169 * little dance to avoid having the terminal be available
1170 * for reuse before we've cleaned it up.
1175 vt = session_open_vt(s);
1181 (void) ioctl(vt, KDSETMODE, KD_TEXT);
1183 if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
1188 (void) ioctl(vt, KDSKBMODE, kb);
1190 (void) ioctl(vt, VT_SETMODE, &mode);
1191 (void) fchown(vt, 0, (gid_t) -1);
1193 s->vtfd = safe_close(s->vtfd);
1196 void session_leave_vt(Session *s) {
1201 /* This is called whenever we get a VT-switch signal from the kernel.
1202 * We acknowledge all of them unconditionally. Note that session are
1203 * free to overwrite those handlers and we only register them for
1204 * sessions with controllers. Legacy sessions are not affected.
1205 * However, if we switch from a non-legacy to a legacy session, we must
1206 * make sure to pause all device before acknowledging the switch. We
1207 * process the real switch only after we are notified via sysfs, so the
1208 * legacy session might have already started using the devices. If we
1209 * don't pause the devices before the switch, we might confuse the
1210 * session we switch to. */
1215 session_device_pause_all(s);
1216 r = ioctl(s->vtfd, VT_RELDISP, 1);
1218 log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
1221 bool session_is_controller(Session *s, const char *sender) {
1224 return streq_ptr(s->controller, sender);
1227 static void session_release_controller(Session *s, bool notify) {
1228 _cleanup_free_ char *name = NULL;
1234 name = s->controller;
1236 /* By resetting the controller before releasing the devices, we won't
1237 * send notification signals. This avoids sending useless notifications
1238 * if the controller is released on disconnects. */
1240 s->controller = NULL;
1242 while ((sd = hashmap_first(s->devices)))
1243 session_device_free(sd);
1245 s->controller = NULL;
1246 s->track = sd_bus_track_unref(s->track);
1249 static int on_bus_track(sd_bus_track *track, void *userdata) {
1250 Session *s = userdata;
1255 session_drop_controller(s);
1260 int session_set_controller(Session *s, const char *sender, bool force) {
1261 _cleanup_free_ char *name = NULL;
1267 if (session_is_controller(s, sender))
1269 if (s->controller && !force)
1272 name = strdup(sender);
1276 s->track = sd_bus_track_unref(s->track);
1277 r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
1281 r = sd_bus_track_add_name(s->track, name);
1285 /* When setting a session controller, we forcibly mute the VT and set
1286 * it into graphics-mode. Applications can override that by changing
1287 * VT state after calling TakeControl(). However, this serves as a good
1288 * default and well-behaving controllers can now ignore VTs entirely.
1289 * Note that we reset the VT on ReleaseControl() and if the controller
1291 * If logind crashes/restarts, we restore the controller during restart
1292 * or reset the VT in case it crashed/exited, too. */
1293 r = session_prepare_vt(s);
1295 s->track = sd_bus_track_unref(s->track);
1299 session_release_controller(s, true);
1300 s->controller = name;
1307 void session_drop_controller(Session *s) {
1313 s->track = sd_bus_track_unref(s->track);
1314 session_release_controller(s, false);
1316 session_restore_vt(s);
1319 static const char* const session_state_table[_SESSION_STATE_MAX] = {
1320 [SESSION_OPENING] = "opening",
1321 [SESSION_ONLINE] = "online",
1322 [SESSION_ACTIVE] = "active",
1323 [SESSION_CLOSING] = "closing"
1326 DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
1328 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
1329 [SESSION_UNSPECIFIED] = "unspecified",
1330 [SESSION_TTY] = "tty",
1331 [SESSION_X11] = "x11",
1332 [SESSION_WAYLAND] = "wayland",
1333 [SESSION_MIR] = "mir",
1334 [SESSION_WEB] = "web",
1337 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
1339 static const char* const session_class_table[_SESSION_CLASS_MAX] = {
1340 [SESSION_USER] = "user",
1341 [SESSION_GREETER] = "greeter",
1342 [SESSION_LOCK_SCREEN] = "lock-screen",
1343 [SESSION_BACKGROUND] = "background"
1346 DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
1348 static const char* const kill_who_table[_KILL_WHO_MAX] = {
1349 [KILL_LEADER] = "leader",
1353 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);