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"
36 #include "extract-word.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 #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);
90 void session_free(Session *s) {
96 LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
98 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
100 session_remove_fifo(s);
102 session_drop_controller(s);
104 while ((sd = hashmap_first(s->devices)))
105 session_device_free(sd);
107 hashmap_free(s->devices);
110 LIST_REMOVE(sessions_by_user, s->user->sessions, s);
112 if (s->user->display == s)
113 s->user->display = NULL;
117 if (s->seat->active == s)
118 s->seat->active = NULL;
119 if (s->seat->pending_switch == s)
120 s->seat->pending_switch = NULL;
122 seat_evict_position(s->seat, s);
123 LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
127 hashmap_remove(s->manager->session_units, s->scope);
131 #if 0 /// elogind does not support systemd scope_jobs
135 sd_bus_message_unref(s->create_message);
139 free(s->remote_host);
140 free(s->remote_user);
144 hashmap_remove(s->manager->sessions, s->id);
150 void session_set_user(Session *s, User *u) {
155 LIST_PREPEND(sessions_by_user, u->sessions, s);
158 static void session_save_devices(Session *s, FILE *f) {
162 if (!hashmap_isempty(s->devices)) {
163 fprintf(f, "DEVICES=");
164 HASHMAP_FOREACH(sd, s->devices, i)
165 fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
170 int session_save(Session *s) {
171 _cleanup_free_ char *temp_path = NULL;
172 _cleanup_fclose_ FILE *f = NULL;
183 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
187 r = fopen_temporary(s->state_file, &f, &temp_path);
193 fchmod(fileno(f), 0644);
196 "# This is private data. Do not parse.\n"
204 session_is_active(s),
205 session_state_to_string(session_get_state(s)),
209 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
212 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
215 fprintf(f, "SCOPE=%s\n", s->scope);
216 #if 0 /// elogind does not support systemd scope_jobs
218 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
222 fprintf(f, "FIFO=%s\n", s->fifo_path);
225 fprintf(f, "SEAT=%s\n", s->seat->id);
228 fprintf(f, "TTY=%s\n", s->tty);
231 fprintf(f, "DISPLAY=%s\n", s->display);
233 if (s->remote_host) {
234 _cleanup_free_ char *escaped;
236 escaped = cescape(s->remote_host);
242 fprintf(f, "REMOTE_HOST=%s\n", escaped);
245 if (s->remote_user) {
246 _cleanup_free_ char *escaped;
248 escaped = cescape(s->remote_user);
254 fprintf(f, "REMOTE_USER=%s\n", escaped);
258 _cleanup_free_ char *escaped;
260 escaped = cescape(s->service);
266 fprintf(f, "SERVICE=%s\n", escaped);
270 _cleanup_free_ char *escaped;
273 escaped = cescape(s->desktop);
279 fprintf(f, "DESKTOP=%s\n", escaped);
282 if (s->seat && seat_has_vts(s->seat))
283 fprintf(f, "VTNR=%u\n", s->vtnr);
286 fprintf(f, "POSITION=%u\n", s->position);
289 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
292 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
294 if (dual_timestamp_is_set(&s->timestamp))
296 "REALTIME="USEC_FMT"\n"
297 "MONOTONIC="USEC_FMT"\n",
298 s->timestamp.realtime,
299 s->timestamp.monotonic);
302 fprintf(f, "CONTROLLER=%s\n", s->controller);
303 session_save_devices(s, f);
306 r = fflush_and_check(f);
310 if (rename(temp_path, s->state_file) < 0) {
318 (void) unlink(s->state_file);
321 (void) unlink(temp_path);
323 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
326 static int session_load_devices(Session *s, const char *devices) {
332 for (p = devices;;) {
333 _cleanup_free_ char *word = NULL;
338 k = extract_first_word(&p, &word, NULL, 0);
346 k = parse_dev(word, &dev);
352 /* The file descriptors for loaded devices will be reattached later. */
353 k = session_device_new(s, dev, false, &sd);
359 log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
364 int session_load(Session *s) {
365 _cleanup_free_ char *remote = NULL,
384 r = parse_env_file(s->state_file, NEWLINE,
387 #if 0 /// elogind does not support systemd scope_jobs
388 "SCOPE_JOB", &s->scope_job,
390 "FIFO", &s->fifo_path,
393 "DISPLAY", &s->display,
394 "REMOTE_HOST", &s->remote_host,
395 "REMOTE_USER", &s->remote_user,
396 "SERVICE", &s->service,
397 "DESKTOP", &s->desktop,
400 "POSITION", &position,
405 "REALTIME", &realtime,
406 "MONOTONIC", &monotonic,
407 "CONTROLLER", &controller,
413 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
420 log_error("UID not specified for session %s", s->id);
424 r = parse_uid(uid, &u);
426 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
430 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
432 log_error("User of session %s not known.", s->id);
436 session_set_user(s, user);
440 k = parse_boolean(remote);
446 safe_atou(vtnr, &s->vtnr);
448 if (seat && !s->seat) {
451 o = hashmap_get(s->manager->seats, seat);
453 r = seat_attach_session(o, s);
455 log_error("Cannot attach session %s to seat %s", s->id, seat);
458 if (!s->seat || !seat_has_vts(s->seat))
461 if (position && s->seat) {
464 safe_atou(position, &npos);
465 seat_claim_position(s->seat, s, npos);
469 k = parse_pid(leader, &s->leader);
471 audit_session_from_pid(s->leader, &s->audit_id);
477 t = session_type_from_string(type);
485 c = session_class_from_string(class);
490 if (state && streq(state, "closing"))
496 /* If we open an unopened pipe for reading we will not
497 get an EOF. to trigger an EOF we hence open it for
498 writing, but close it right away which then will
499 trigger the EOF. This will happen immediately if no
500 other process has the FIFO open for writing, i. e.
501 when the session died before logind (re)started. */
503 fd = session_create_fifo(s);
508 timestamp_deserialize(realtime, &s->timestamp.realtime);
510 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
513 k = parse_boolean(active);
519 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
520 session_set_controller(s, controller, false, false);
521 session_load_devices(s, devices);
523 session_restore_vt(s);
529 int session_activate(Session *s) {
530 unsigned int num_pending;
538 if (s->seat->active == s)
541 /* on seats with VTs, we let VTs manage session-switching */
542 if (seat_has_vts(s->seat)) {
546 return chvt(s->vtnr);
549 /* On seats without VTs, we implement session-switching in logind. We
550 * try to pause all session-devices and wait until the session
551 * controller acknowledged them. Once all devices are asleep, we simply
552 * switch the active session and be done.
553 * We save the session we want to switch to in seat->pending_switch and
554 * seat_complete_switch() will perform the final switch. */
556 s->seat->pending_switch = s;
558 /* if no devices are running, immediately perform the session switch */
559 num_pending = session_device_try_pause_all(s);
561 seat_complete_switch(s->seat);
566 #if 0 /// UNNEEDED by elogind
567 static int session_start_scope(Session *s) {
574 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
575 char *scope, *job = NULL;
576 const char *description;
578 scope = strjoin("session-", s->id, ".scope");
582 description = strjoina("Session ", s->id, " of user ", s->user->name);
584 r = manager_start_scope(
590 "systemd-logind.service",
591 "systemd-user-sessions.service",
592 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
596 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
608 (void) hashmap_put(s->manager->session_units, s->scope, s);
613 static int session_start_cgroup(Session *s) {
618 assert(s->leader > 0);
620 /* First, create our own group */
621 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
623 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
625 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
627 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
633 int session_start(Session *s) {
644 r = user_start(s->user);
649 #if 0 /// elogind does its own session management
650 r = session_start_scope(s);
652 r = session_start_cgroup(s);
657 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
658 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
659 "SESSION_ID=%s", s->id,
660 "USER_ID=%s", s->user->name,
661 "LEADER="PID_FMT, s->leader,
662 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
665 if (!dual_timestamp_is_set(&s->timestamp))
666 dual_timestamp_get(&s->timestamp);
669 seat_read_active_vt(s->seat);
673 user_elect_display(s->user);
682 session_send_signal(s, true);
683 user_send_changed(s->user, "Display", NULL);
685 if (s->seat->active == s)
686 seat_send_changed(s->seat, "ActiveSession", NULL);
692 #if 0 /// UNNEEDED by elogind
693 static int session_stop_scope(Session *s, bool force) {
694 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
702 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
703 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
704 * when killing any processes left after this point. */
705 r = manager_abandon_scope(s->manager, s->scope, &error);
707 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
709 /* Optionally, let's kill everything that's left now. */
710 if (force || manager_shall_kill(s->manager, s->user->name)) {
713 r = manager_stop_unit(s->manager, s->scope, &error, &job);
715 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
720 s->scope_job = mfree(s->scope_job);
725 static int session_stop_cgroup(Session *s, bool force) {
726 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
731 if (force || manager_shall_kill(s->manager, s->user->name)) {
732 r = session_kill(s, KILL_ALL, SIGTERM);
741 int session_stop(Session *s, bool force) {
749 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
752 seat_evict_position(s->seat, s);
754 /* We are going down, don't care about FIFOs anymore */
755 session_remove_fifo(s);
758 #if 0 /// elogind does not start scopes, but sessions
759 r = session_stop_scope(s, force);
761 r = session_stop_cgroup(s, force);
766 user_elect_display(s->user);
771 #if 1 /// elogind must queue this session again
772 session_add_to_gc_queue(s);
777 int session_finalize(Session *s) {
786 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
787 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
788 "SESSION_ID=%s", s->id,
789 "USER_ID=%s", s->user->name,
790 "LEADER="PID_FMT, s->leader,
791 LOG_MESSAGE("Removed session %s.", s->id),
794 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
797 seat_evict_position(s->seat, s);
799 /* Kill session devices */
800 while ((sd = hashmap_first(s->devices)))
801 session_device_free(sd);
803 (void) unlink(s->state_file);
804 session_add_to_gc_queue(s);
805 user_add_to_gc_queue(s->user);
808 session_send_signal(s, false);
813 if (s->seat->active == s)
814 seat_set_active(s->seat, NULL);
820 user_send_changed(s->user, "Display", NULL);
825 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
826 Session *s = userdata;
831 session_stop(s, false);
835 int session_release(Session *s) {
838 if (!s->started || s->stopping)
841 if (s->timer_event_source)
844 return sd_event_add_time(s->manager->event,
845 &s->timer_event_source,
847 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
848 release_timeout_callback, s);
851 bool session_is_active(Session *s) {
857 return s->seat->active == s;
860 static int get_tty_atime(const char *tty, usec_t *atime) {
861 _cleanup_free_ char *p = NULL;
867 if (!path_is_absolute(tty)) {
868 p = strappend("/dev/", tty);
873 } else if (!path_startswith(tty, "/dev/"))
876 if (lstat(tty, &st) < 0)
879 *atime = timespec_load(&st.st_atim);
883 static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
884 _cleanup_free_ char *p = NULL;
890 r = get_ctty(pid, NULL, &p);
894 return get_tty_atime(p, atime);
897 int session_get_idle_hint(Session *s, dual_timestamp *t) {
903 /* Explicit idle hint is set */
906 *t = s->idle_hint_timestamp;
911 /* Graphical sessions should really implement a real
913 if (SESSION_TYPE_IS_GRAPHICAL(s->type))
916 /* For sessions with an explicitly configured tty, let's check
919 r = get_tty_atime(s->tty, &atime);
924 /* For sessions with a leader but no explicitly configured
925 * tty, let's check the controlling tty of the leader */
927 r = get_process_ctty_atime(s->leader, &atime);
934 *t = s->idle_hint_timestamp;
940 dual_timestamp_from_realtime(t, atime);
942 n = now(CLOCK_REALTIME);
944 if (s->manager->idle_action_usec <= 0)
947 return atime + s->manager->idle_action_usec <= n;
950 void session_set_idle_hint(Session *s, bool b) {
953 if (s->idle_hint == b)
957 dual_timestamp_get(&s->idle_hint_timestamp);
959 session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
962 seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
964 user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
965 manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
968 int session_get_locked_hint(Session *s) {
971 return s->locked_hint;
974 void session_set_locked_hint(Session *s, bool b) {
977 if (s->locked_hint == b)
982 session_send_changed(s, "LockedHint", NULL);
985 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
986 Session *s = userdata;
989 assert(s->fifo_fd == fd);
991 /* EOF on the FIFO means the session died abnormally. */
993 session_remove_fifo(s);
994 session_stop(s, false);
999 int session_create_fifo(Session *s) {
1005 if (!s->fifo_path) {
1006 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
1010 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
1013 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
1017 /* Open reading side */
1018 if (s->fifo_fd < 0) {
1019 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
1025 if (!s->fifo_event_source) {
1026 r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
1030 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
1032 r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1037 /* Open writing side */
1038 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
1045 static void session_remove_fifo(Session *s) {
1048 s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
1049 s->fifo_fd = safe_close(s->fifo_fd);
1052 unlink(s->fifo_path);
1053 s->fifo_path = mfree(s->fifo_path);
1057 bool session_check_gc(Session *s, bool drop_not_started) {
1060 if (drop_not_started && !s->started)
1066 if (s->fifo_fd >= 0) {
1067 if (pipe_eof(s->fifo_fd) <= 0)
1071 #if 0 /// elogind supports neither scopes nor jobs
1072 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1075 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1082 void session_add_to_gc_queue(Session *s) {
1088 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1089 s->in_gc_queue = true;
1092 SessionState session_get_state(Session *s) {
1095 /* always check closing first */
1096 if (s->stopping || s->timer_event_source)
1097 return SESSION_CLOSING;
1099 #if 0 /// elogind does not support systemd scope_jobs
1100 if (s->scope_job || s->fifo_fd < 0)
1104 return SESSION_OPENING;
1106 if (session_is_active(s))
1107 return SESSION_ACTIVE;
1109 return SESSION_ONLINE;
1112 int session_kill(Session *s, KillWho who, int signo) {
1115 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1119 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1121 if (who == KILL_LEADER) {
1125 /* FIXME: verify that leader is in cgroup? */
1127 if (kill(s->leader, signo) < 0) {
1128 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1132 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1133 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1138 static int session_open_vt(Session *s) {
1139 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1147 sprintf(path, "/dev/tty%u", s->vtnr);
1148 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1150 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1155 int session_prepare_vt(Session *s) {
1157 struct vt_mode mode = { 0 };
1162 vt = session_open_vt(s);
1166 r = fchown(vt, s->user->uid, -1);
1168 r = log_error_errno(errno,
1169 "Cannot change owner of /dev/tty%u: %m",
1174 r = ioctl(vt, KDSKBMODE, K_OFF);
1176 r = log_error_errno(errno,
1177 "Cannot set K_OFF on /dev/tty%u: %m",
1182 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1184 r = log_error_errno(errno,
1185 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1190 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1191 * So we need a dummy handler here which just acknowledges *all* VT
1192 * switch requests. */
1193 mode.mode = VT_PROCESS;
1194 mode.relsig = SIGRTMIN;
1195 mode.acqsig = SIGRTMIN + 1;
1196 r = ioctl(vt, VT_SETMODE, &mode);
1198 r = log_error_errno(errno,
1199 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1207 session_restore_vt(s);
1211 void session_restore_vt(Session *s) {
1213 static const struct vt_mode mode = {
1217 _cleanup_free_ char *utf8 = NULL;
1220 /* We need to get a fresh handle to the virtual terminal,
1221 * since the old file-descriptor is potentially in a hung-up
1222 * state after the controlling process exited; we do a
1223 * little dance to avoid having the terminal be available
1224 * for reuse before we've cleaned it up.
1229 vt = session_open_vt(s);
1235 (void) ioctl(vt, KDSETMODE, KD_TEXT);
1237 if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
1242 (void) ioctl(vt, KDSKBMODE, kb);
1244 (void) ioctl(vt, VT_SETMODE, &mode);
1245 (void) fchown(vt, 0, (gid_t) -1);
1247 s->vtfd = safe_close(s->vtfd);
1250 void session_leave_vt(Session *s) {
1255 /* This is called whenever we get a VT-switch signal from the kernel.
1256 * We acknowledge all of them unconditionally. Note that session are
1257 * free to overwrite those handlers and we only register them for
1258 * sessions with controllers. Legacy sessions are not affected.
1259 * However, if we switch from a non-legacy to a legacy session, we must
1260 * make sure to pause all device before acknowledging the switch. We
1261 * process the real switch only after we are notified via sysfs, so the
1262 * legacy session might have already started using the devices. If we
1263 * don't pause the devices before the switch, we might confuse the
1264 * session we switch to. */
1269 session_device_pause_all(s);
1270 r = ioctl(s->vtfd, VT_RELDISP, 1);
1272 log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
1275 bool session_is_controller(Session *s, const char *sender) {
1278 return streq_ptr(s->controller, sender);
1281 static void session_release_controller(Session *s, bool notify) {
1282 _cleanup_free_ char *name = NULL;
1288 name = s->controller;
1290 /* By resetting the controller before releasing the devices, we won't
1291 * send notification signals. This avoids sending useless notifications
1292 * if the controller is released on disconnects. */
1294 s->controller = NULL;
1296 while ((sd = hashmap_first(s->devices)))
1297 session_device_free(sd);
1299 s->controller = NULL;
1300 s->track = sd_bus_track_unref(s->track);
1303 static int on_bus_track(sd_bus_track *track, void *userdata) {
1304 Session *s = userdata;
1309 session_drop_controller(s);
1314 int session_set_controller(Session *s, const char *sender, bool force, bool prepare) {
1315 _cleanup_free_ char *name = NULL;
1321 if (session_is_controller(s, sender))
1323 if (s->controller && !force)
1326 name = strdup(sender);
1330 s->track = sd_bus_track_unref(s->track);
1331 r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
1335 r = sd_bus_track_add_name(s->track, name);
1339 /* When setting a session controller, we forcibly mute the VT and set
1340 * it into graphics-mode. Applications can override that by changing
1341 * VT state after calling TakeControl(). However, this serves as a good
1342 * default and well-behaving controllers can now ignore VTs entirely.
1343 * Note that we reset the VT on ReleaseControl() and if the controller
1345 * If logind crashes/restarts, we restore the controller during restart
1346 * (without preparing the VT since the controller has probably overridden
1347 * VT state by now) or reset the VT in case it crashed/exited, too. */
1349 r = session_prepare_vt(s);
1351 s->track = sd_bus_track_unref(s->track);
1356 session_release_controller(s, true);
1357 s->controller = name;
1364 void session_drop_controller(Session *s) {
1370 s->track = sd_bus_track_unref(s->track);
1371 session_release_controller(s, false);
1373 session_restore_vt(s);
1376 static const char* const session_state_table[_SESSION_STATE_MAX] = {
1377 [SESSION_OPENING] = "opening",
1378 [SESSION_ONLINE] = "online",
1379 [SESSION_ACTIVE] = "active",
1380 [SESSION_CLOSING] = "closing"
1383 DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
1385 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
1386 [SESSION_UNSPECIFIED] = "unspecified",
1387 [SESSION_TTY] = "tty",
1388 [SESSION_X11] = "x11",
1389 [SESSION_WAYLAND] = "wayland",
1390 [SESSION_MIR] = "mir",
1391 [SESSION_WEB] = "web",
1394 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
1396 static const char* const session_class_table[_SESSION_CLASS_MAX] = {
1397 [SESSION_USER] = "user",
1398 [SESSION_GREETER] = "greeter",
1399 [SESSION_LOCK_SCREEN] = "lock-screen",
1400 [SESSION_BACKGROUND] = "background"
1403 DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
1405 static const char* const kill_who_table[_KILL_WHO_MAX] = {
1406 [KILL_LEADER] = "leader",
1410 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);