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"
50 /// Additional includes needed by elogind
51 #include "extract-word.h"
52 #include "process-util.h"
54 #define RELEASE_USEC (20*USEC_PER_SEC)
56 static void session_remove_fifo(Session *s);
58 Session* session_new(Manager *m, const char *id) {
63 assert(session_id_valid(id));
69 s->state_file = strappend("/run/systemd/sessions/", id);
73 s->devices = hashmap_new(&devt_hash_ops);
79 s->id = basename(s->state_file);
81 if (hashmap_put(m->sessions, s->id, s) < 0) {
82 hashmap_free(s->devices);
90 s->audit_id = AUDIT_SESSION_INVALID;
95 void session_free(Session *s) {
101 LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
103 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
105 session_remove_fifo(s);
107 session_drop_controller(s);
109 while ((sd = hashmap_first(s->devices)))
110 session_device_free(sd);
112 hashmap_free(s->devices);
115 LIST_REMOVE(sessions_by_user, s->user->sessions, s);
117 if (s->user->display == s)
118 s->user->display = NULL;
122 if (s->seat->active == s)
123 s->seat->active = NULL;
124 if (s->seat->pending_switch == s)
125 s->seat->pending_switch = NULL;
127 seat_evict_position(s->seat, s);
128 LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
132 hashmap_remove(s->manager->session_units, s->scope);
136 #if 0 /// elogind does not support systemd scope_jobs
140 sd_bus_message_unref(s->create_message);
144 free(s->remote_host);
145 free(s->remote_user);
149 hashmap_remove(s->manager->sessions, s->id);
155 void session_set_user(Session *s, User *u) {
160 LIST_PREPEND(sessions_by_user, u->sessions, s);
163 static void session_save_devices(Session *s, FILE *f) {
167 if (!hashmap_isempty(s->devices)) {
168 fprintf(f, "DEVICES=");
169 HASHMAP_FOREACH(sd, s->devices, i)
170 fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
175 int session_save(Session *s) {
176 _cleanup_free_ char *temp_path = NULL;
177 _cleanup_fclose_ FILE *f = NULL;
188 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
192 r = fopen_temporary(s->state_file, &f, &temp_path);
198 fchmod(fileno(f), 0644);
201 "# This is private data. Do not parse.\n"
209 session_is_active(s),
210 session_state_to_string(session_get_state(s)),
214 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
217 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
220 fprintf(f, "SCOPE=%s\n", s->scope);
221 #if 0 /// elogind does not support systemd scope_jobs
223 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
227 fprintf(f, "FIFO=%s\n", s->fifo_path);
230 fprintf(f, "SEAT=%s\n", s->seat->id);
233 fprintf(f, "TTY=%s\n", s->tty);
236 fprintf(f, "DISPLAY=%s\n", s->display);
238 if (s->remote_host) {
239 _cleanup_free_ char *escaped;
241 escaped = cescape(s->remote_host);
247 fprintf(f, "REMOTE_HOST=%s\n", escaped);
250 if (s->remote_user) {
251 _cleanup_free_ char *escaped;
253 escaped = cescape(s->remote_user);
259 fprintf(f, "REMOTE_USER=%s\n", escaped);
263 _cleanup_free_ char *escaped;
265 escaped = cescape(s->service);
271 fprintf(f, "SERVICE=%s\n", escaped);
275 _cleanup_free_ char *escaped;
278 escaped = cescape(s->desktop);
284 fprintf(f, "DESKTOP=%s\n", escaped);
287 if (s->seat && seat_has_vts(s->seat))
288 fprintf(f, "VTNR=%u\n", s->vtnr);
291 fprintf(f, "POSITION=%u\n", s->position);
293 if (pid_is_valid(s->leader))
294 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
296 if (audit_session_is_valid(s->audit_id))
297 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
299 if (dual_timestamp_is_set(&s->timestamp))
301 "REALTIME="USEC_FMT"\n"
302 "MONOTONIC="USEC_FMT"\n",
303 s->timestamp.realtime,
304 s->timestamp.monotonic);
307 fprintf(f, "CONTROLLER=%s\n", s->controller);
308 session_save_devices(s, f);
311 r = fflush_and_check(f);
315 if (rename(temp_path, s->state_file) < 0) {
323 (void) unlink(s->state_file);
326 (void) unlink(temp_path);
328 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
331 static int session_load_devices(Session *s, const char *devices) {
337 for (p = devices;;) {
338 _cleanup_free_ char *word = NULL;
343 k = extract_first_word(&p, &word, NULL, 0);
351 k = parse_dev(word, &dev);
357 /* The file descriptors for loaded devices will be reattached later. */
358 k = session_device_new(s, dev, false, &sd);
364 log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
369 int session_load(Session *s) {
370 _cleanup_free_ char *remote = NULL,
389 r = parse_env_file(s->state_file, NEWLINE,
392 #if 0 /// elogind does not support systemd scope_jobs
393 "SCOPE_JOB", &s->scope_job,
395 "FIFO", &s->fifo_path,
398 "DISPLAY", &s->display,
399 "REMOTE_HOST", &s->remote_host,
400 "REMOTE_USER", &s->remote_user,
401 "SERVICE", &s->service,
402 "DESKTOP", &s->desktop,
405 "POSITION", &position,
410 "REALTIME", &realtime,
411 "MONOTONIC", &monotonic,
412 "CONTROLLER", &controller,
418 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
425 log_error("UID not specified for session %s", s->id);
429 r = parse_uid(uid, &u);
431 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
435 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
437 log_error("User of session %s not known.", s->id);
441 session_set_user(s, user);
445 k = parse_boolean(remote);
451 safe_atou(vtnr, &s->vtnr);
453 if (seat && !s->seat) {
456 o = hashmap_get(s->manager->seats, seat);
458 r = seat_attach_session(o, s);
460 log_error("Cannot attach session %s to seat %s", s->id, seat);
463 if (!s->seat || !seat_has_vts(s->seat))
466 if (position && s->seat) {
469 safe_atou(position, &npos);
470 seat_claim_position(s->seat, s, npos);
474 if (parse_pid(leader, &s->leader) >= 0)
475 (void) audit_session_from_pid(s->leader, &s->audit_id);
481 t = session_type_from_string(type);
489 c = session_class_from_string(class);
494 if (state && streq(state, "closing"))
500 /* If we open an unopened pipe for reading we will not
501 get an EOF. to trigger an EOF we hence open it for
502 writing, but close it right away which then will
503 trigger the EOF. This will happen immediately if no
504 other process has the FIFO open for writing, i. e.
505 when the session died before logind (re)started. */
507 fd = session_create_fifo(s);
512 timestamp_deserialize(realtime, &s->timestamp.realtime);
514 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
517 k = parse_boolean(active);
523 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
524 session_set_controller(s, controller, false, false);
525 session_load_devices(s, devices);
527 session_restore_vt(s);
533 int session_activate(Session *s) {
534 unsigned int num_pending;
542 if (s->seat->active == s)
545 /* on seats with VTs, we let VTs manage session-switching */
546 if (seat_has_vts(s->seat)) {
550 return chvt(s->vtnr);
553 /* On seats without VTs, we implement session-switching in logind. We
554 * try to pause all session-devices and wait until the session
555 * controller acknowledged them. Once all devices are asleep, we simply
556 * switch the active session and be done.
557 * We save the session we want to switch to in seat->pending_switch and
558 * seat_complete_switch() will perform the final switch. */
560 s->seat->pending_switch = s;
562 /* if no devices are running, immediately perform the session switch */
563 num_pending = session_device_try_pause_all(s);
565 seat_complete_switch(s->seat);
570 #if 0 /// UNNEEDED by elogind
571 static int session_start_scope(Session *s) {
578 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
579 char *scope, *job = NULL;
580 const char *description;
582 scope = strjoin("session-", s->id, ".scope");
586 description = strjoina("Session ", s->id, " of user ", s->user->name);
588 r = manager_start_scope(
594 "systemd-logind.service",
595 "systemd-user-sessions.service",
596 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
600 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
612 (void) hashmap_put(s->manager->session_units, s->scope, s);
617 static int session_start_cgroup(Session *s) {
622 assert(s->leader > 0);
624 /* First, create our own group */
625 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
627 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
629 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
631 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
637 int session_start(Session *s) {
648 r = user_start(s->user);
653 #if 0 /// elogind does its own session management
654 r = session_start_scope(s);
656 r = session_start_cgroup(s);
661 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
662 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
663 "SESSION_ID=%s", s->id,
664 "USER_ID=%s", s->user->name,
665 "LEADER="PID_FMT, s->leader,
666 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
669 if (!dual_timestamp_is_set(&s->timestamp))
670 dual_timestamp_get(&s->timestamp);
673 seat_read_active_vt(s->seat);
677 user_elect_display(s->user);
686 session_send_signal(s, true);
687 user_send_changed(s->user, "Display", NULL);
689 if (s->seat->active == s)
690 seat_send_changed(s->seat, "ActiveSession", NULL);
696 #if 0 /// UNNEEDED by elogind
697 static int session_stop_scope(Session *s, bool force) {
698 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
706 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
707 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
708 * when killing any processes left after this point. */
709 r = manager_abandon_scope(s->manager, s->scope, &error);
711 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
713 /* Optionally, let's kill everything that's left now. */
714 if (force || manager_shall_kill(s->manager, s->user->name)) {
717 r = manager_stop_unit(s->manager, s->scope, &error, &job);
719 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
724 s->scope_job = mfree(s->scope_job);
729 static int session_stop_cgroup(Session *s, bool force) {
730 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
735 if (force || manager_shall_kill(s->manager, s->user->name)) {
736 r = session_kill(s, KILL_ALL, SIGTERM);
745 int session_stop(Session *s, bool force) {
753 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
756 seat_evict_position(s->seat, s);
758 /* We are going down, don't care about FIFOs anymore */
759 session_remove_fifo(s);
762 #if 0 /// elogind does not start scopes, but sessions
763 r = session_stop_scope(s, force);
765 r = session_stop_cgroup(s, force);
770 user_elect_display(s->user);
775 #if 1 /// elogind must queue this session again
776 session_add_to_gc_queue(s);
781 int session_finalize(Session *s) {
790 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
791 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
792 "SESSION_ID=%s", s->id,
793 "USER_ID=%s", s->user->name,
794 "LEADER="PID_FMT, s->leader,
795 LOG_MESSAGE("Removed session %s.", s->id),
798 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
801 seat_evict_position(s->seat, s);
803 /* Kill session devices */
804 while ((sd = hashmap_first(s->devices)))
805 session_device_free(sd);
807 (void) unlink(s->state_file);
808 session_add_to_gc_queue(s);
809 user_add_to_gc_queue(s->user);
812 session_send_signal(s, false);
817 if (s->seat->active == s)
818 seat_set_active(s->seat, NULL);
824 user_send_changed(s->user, "Display", NULL);
829 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
830 Session *s = userdata;
835 session_stop(s, false);
839 int session_release(Session *s) {
842 if (!s->started || s->stopping)
845 if (s->timer_event_source)
848 return sd_event_add_time(s->manager->event,
849 &s->timer_event_source,
851 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
852 release_timeout_callback, s);
855 bool session_is_active(Session *s) {
861 return s->seat->active == s;
864 static int get_tty_atime(const char *tty, usec_t *atime) {
865 _cleanup_free_ char *p = NULL;
871 if (!path_is_absolute(tty)) {
872 p = strappend("/dev/", tty);
877 } else if (!path_startswith(tty, "/dev/"))
880 if (lstat(tty, &st) < 0)
883 *atime = timespec_load(&st.st_atim);
887 static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
888 _cleanup_free_ char *p = NULL;
894 r = get_ctty(pid, NULL, &p);
898 return get_tty_atime(p, atime);
901 int session_get_idle_hint(Session *s, dual_timestamp *t) {
907 /* Explicit idle hint is set */
910 *t = s->idle_hint_timestamp;
915 /* Graphical sessions should really implement a real
917 if (SESSION_TYPE_IS_GRAPHICAL(s->type))
920 /* For sessions with an explicitly configured tty, let's check
923 r = get_tty_atime(s->tty, &atime);
928 /* For sessions with a leader but no explicitly configured
929 * tty, let's check the controlling tty of the leader */
931 r = get_process_ctty_atime(s->leader, &atime);
938 *t = s->idle_hint_timestamp;
944 dual_timestamp_from_realtime(t, atime);
946 n = now(CLOCK_REALTIME);
948 if (s->manager->idle_action_usec <= 0)
951 return atime + s->manager->idle_action_usec <= n;
954 void session_set_idle_hint(Session *s, bool b) {
957 if (s->idle_hint == b)
961 dual_timestamp_get(&s->idle_hint_timestamp);
963 session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
966 seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
968 user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
969 manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
972 int session_get_locked_hint(Session *s) {
975 return s->locked_hint;
978 void session_set_locked_hint(Session *s, bool b) {
981 if (s->locked_hint == b)
986 session_send_changed(s, "LockedHint", NULL);
989 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
990 Session *s = userdata;
993 assert(s->fifo_fd == fd);
995 /* EOF on the FIFO means the session died abnormally. */
997 session_remove_fifo(s);
998 session_stop(s, false);
1003 int session_create_fifo(Session *s) {
1009 if (!s->fifo_path) {
1010 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0, false);
1014 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
1017 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
1021 /* Open reading side */
1022 if (s->fifo_fd < 0) {
1023 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
1029 if (!s->fifo_event_source) {
1030 r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
1034 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
1036 r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1041 /* Open writing side */
1042 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK);
1049 static void session_remove_fifo(Session *s) {
1052 s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
1053 s->fifo_fd = safe_close(s->fifo_fd);
1056 unlink(s->fifo_path);
1057 s->fifo_path = mfree(s->fifo_path);
1061 bool session_may_gc(Session *s, bool drop_not_started) {
1064 if (drop_not_started && !s->started)
1070 if (s->fifo_fd >= 0) {
1071 if (pipe_eof(s->fifo_fd) <= 0)
1075 #if 0 /// elogind supports neither scopes nor jobs
1076 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1079 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1086 void session_add_to_gc_queue(Session *s) {
1092 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1093 s->in_gc_queue = true;
1096 SessionState session_get_state(Session *s) {
1099 /* always check closing first */
1100 if (s->stopping || s->timer_event_source)
1101 return SESSION_CLOSING;
1103 #if 0 /// elogind does not support systemd scope_jobs
1104 if (s->scope_job || s->fifo_fd < 0)
1108 return SESSION_OPENING;
1110 if (session_is_active(s))
1111 return SESSION_ACTIVE;
1113 return SESSION_ONLINE;
1116 int session_kill(Session *s, KillWho who, int signo) {
1119 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1123 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1125 if (who == KILL_LEADER) {
1129 /* FIXME: verify that leader is in cgroup? */
1131 if (kill(s->leader, signo) < 0) {
1132 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1136 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1137 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1142 static int session_open_vt(Session *s) {
1143 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1151 sprintf(path, "/dev/tty%u", s->vtnr);
1152 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1154 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1159 int session_prepare_vt(Session *s) {
1161 struct vt_mode mode = { 0 };
1166 vt = session_open_vt(s);
1170 r = fchown(vt, s->user->uid, -1);
1172 r = log_error_errno(errno,
1173 "Cannot change owner of /dev/tty%u: %m",
1178 r = ioctl(vt, KDSKBMODE, K_OFF);
1180 r = log_error_errno(errno,
1181 "Cannot set K_OFF on /dev/tty%u: %m",
1186 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1188 r = log_error_errno(errno,
1189 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1194 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1195 * So we need a dummy handler here which just acknowledges *all* VT
1196 * switch requests. */
1197 mode.mode = VT_PROCESS;
1198 mode.relsig = SIGRTMIN;
1199 mode.acqsig = SIGRTMIN + 1;
1200 r = ioctl(vt, VT_SETMODE, &mode);
1202 r = log_error_errno(errno,
1203 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1211 session_restore_vt(s);
1215 void session_restore_vt(Session *s) {
1217 static const struct vt_mode mode = {
1223 /* We need to get a fresh handle to the virtual terminal,
1224 * since the old file-descriptor is potentially in a hung-up
1225 * state after the controlling process exited; we do a
1226 * little dance to avoid having the terminal be available
1227 * for reuse before we've cleaned it up.
1232 vt = session_open_vt(s);
1238 (void) ioctl(vt, KDSETMODE, KD_TEXT);
1240 (void) vt_reset_keyboard(vt);
1242 (void) ioctl(vt, VT_SETMODE, &mode);
1243 (void) fchown(vt, 0, (gid_t) -1);
1245 s->vtfd = safe_close(s->vtfd);
1248 void session_leave_vt(Session *s) {
1253 /* This is called whenever we get a VT-switch signal from the kernel.
1254 * We acknowledge all of them unconditionally. Note that session are
1255 * free to overwrite those handlers and we only register them for
1256 * sessions with controllers. Legacy sessions are not affected.
1257 * However, if we switch from a non-legacy to a legacy session, we must
1258 * make sure to pause all device before acknowledging the switch. We
1259 * process the real switch only after we are notified via sysfs, so the
1260 * legacy session might have already started using the devices. If we
1261 * don't pause the devices before the switch, we might confuse the
1262 * session we switch to. */
1267 session_device_pause_all(s);
1268 r = ioctl(s->vtfd, VT_RELDISP, 1);
1270 log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
1273 bool session_is_controller(Session *s, const char *sender) {
1276 return streq_ptr(s->controller, sender);
1279 static void session_release_controller(Session *s, bool notify) {
1280 _cleanup_free_ char *name = NULL;
1286 name = s->controller;
1288 /* By resetting the controller before releasing the devices, we won't
1289 * send notification signals. This avoids sending useless notifications
1290 * if the controller is released on disconnects. */
1292 s->controller = NULL;
1294 while ((sd = hashmap_first(s->devices)))
1295 session_device_free(sd);
1297 s->controller = NULL;
1298 s->track = sd_bus_track_unref(s->track);
1301 static int on_bus_track(sd_bus_track *track, void *userdata) {
1302 Session *s = userdata;
1307 session_drop_controller(s);
1312 int session_set_controller(Session *s, const char *sender, bool force, bool prepare) {
1313 _cleanup_free_ char *name = NULL;
1319 if (session_is_controller(s, sender))
1321 if (s->controller && !force)
1324 name = strdup(sender);
1328 s->track = sd_bus_track_unref(s->track);
1329 r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
1333 r = sd_bus_track_add_name(s->track, name);
1337 /* When setting a session controller, we forcibly mute the VT and set
1338 * it into graphics-mode. Applications can override that by changing
1339 * VT state after calling TakeControl(). However, this serves as a good
1340 * default and well-behaving controllers can now ignore VTs entirely.
1341 * Note that we reset the VT on ReleaseControl() and if the controller
1343 * If logind crashes/restarts, we restore the controller during restart
1344 * (without preparing the VT since the controller has probably overridden
1345 * VT state by now) or reset the VT in case it crashed/exited, too. */
1347 r = session_prepare_vt(s);
1349 s->track = sd_bus_track_unref(s->track);
1354 session_release_controller(s, true);
1355 s->controller = name;
1362 void session_drop_controller(Session *s) {
1368 s->track = sd_bus_track_unref(s->track);
1369 session_release_controller(s, false);
1371 session_restore_vt(s);
1374 static const char* const session_state_table[_SESSION_STATE_MAX] = {
1375 [SESSION_OPENING] = "opening",
1376 [SESSION_ONLINE] = "online",
1377 [SESSION_ACTIVE] = "active",
1378 [SESSION_CLOSING] = "closing"
1381 DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
1383 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
1384 [SESSION_UNSPECIFIED] = "unspecified",
1385 [SESSION_TTY] = "tty",
1386 [SESSION_X11] = "x11",
1387 [SESSION_WAYLAND] = "wayland",
1388 [SESSION_MIR] = "mir",
1389 [SESSION_WEB] = "web",
1392 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
1394 static const char* const session_class_table[_SESSION_CLASS_MAX] = {
1395 [SESSION_USER] = "user",
1396 [SESSION_GREETER] = "greeter",
1397 [SESSION_LOCK_SCREEN] = "lock-screen",
1398 [SESSION_BACKGROUND] = "background"
1401 DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
1403 static const char* const kill_who_table[_KILL_WHO_MAX] = {
1404 [KILL_LEADER] = "leader",
1408 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);