2 This file is part of systemd.
4 Copyright 2011 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/ioctl.h>
29 #include "sd-messages.h"
31 #include "alloc-util.h"
32 #include "audit-util.h"
33 #include "bus-error.h"
38 #include "format-util.h"
40 #include "logind-session.h"
42 #include "parse-util.h"
43 #include "path-util.h"
44 #include "process-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"
53 #define RELEASE_USEC (20*USEC_PER_SEC)
55 static void session_remove_fifo(Session *s);
57 Session* session_new(Manager *m, const char *id) {
62 assert(session_id_valid(id));
68 s->state_file = strappend("/run/systemd/sessions/", id);
72 s->devices = hashmap_new(&devt_hash_ops);
78 s->id = basename(s->state_file);
80 if (hashmap_put(m->sessions, s->id, s) < 0) {
81 hashmap_free(s->devices);
89 s->audit_id = AUDIT_SESSION_INVALID;
94 void session_free(Session *s) {
100 LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s);
102 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
104 session_remove_fifo(s);
106 session_drop_controller(s);
108 while ((sd = hashmap_first(s->devices)))
109 session_device_free(sd);
111 hashmap_free(s->devices);
114 LIST_REMOVE(sessions_by_user, s->user->sessions, s);
116 if (s->user->display == s)
117 s->user->display = NULL;
121 if (s->seat->active == s)
122 s->seat->active = NULL;
123 if (s->seat->pending_switch == s)
124 s->seat->pending_switch = NULL;
126 seat_evict_position(s->seat, s);
127 LIST_REMOVE(sessions_by_seat, s->seat->sessions, s);
131 hashmap_remove(s->manager->session_units, s->scope);
135 #if 0 /// elogind does not support systemd scope_jobs
139 sd_bus_message_unref(s->create_message);
143 free(s->remote_host);
144 free(s->remote_user);
148 hashmap_remove(s->manager->sessions, s->id);
154 void session_set_user(Session *s, User *u) {
159 LIST_PREPEND(sessions_by_user, u->sessions, s);
162 static void session_save_devices(Session *s, FILE *f) {
166 if (!hashmap_isempty(s->devices)) {
167 fprintf(f, "DEVICES=");
168 HASHMAP_FOREACH(sd, s->devices, i)
169 fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
174 int session_save(Session *s) {
175 _cleanup_free_ char *temp_path = NULL;
176 _cleanup_fclose_ FILE *f = NULL;
187 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
191 r = fopen_temporary(s->state_file, &f, &temp_path);
197 fchmod(fileno(f), 0644);
200 "# This is private data. Do not parse.\n"
208 session_is_active(s),
209 session_state_to_string(session_get_state(s)),
213 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
216 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
219 fprintf(f, "SCOPE=%s\n", s->scope);
220 #if 0 /// elogind does not support systemd scope_jobs
222 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
226 fprintf(f, "FIFO=%s\n", s->fifo_path);
229 fprintf(f, "SEAT=%s\n", s->seat->id);
232 fprintf(f, "TTY=%s\n", s->tty);
235 fprintf(f, "DISPLAY=%s\n", s->display);
237 if (s->remote_host) {
238 _cleanup_free_ char *escaped;
240 escaped = cescape(s->remote_host);
246 fprintf(f, "REMOTE_HOST=%s\n", escaped);
249 if (s->remote_user) {
250 _cleanup_free_ char *escaped;
252 escaped = cescape(s->remote_user);
258 fprintf(f, "REMOTE_USER=%s\n", escaped);
262 _cleanup_free_ char *escaped;
264 escaped = cescape(s->service);
270 fprintf(f, "SERVICE=%s\n", escaped);
274 _cleanup_free_ char *escaped;
277 escaped = cescape(s->desktop);
283 fprintf(f, "DESKTOP=%s\n", escaped);
286 if (s->seat && seat_has_vts(s->seat))
287 fprintf(f, "VTNR=%u\n", s->vtnr);
290 fprintf(f, "POSITION=%u\n", s->position);
292 if (pid_is_valid(s->leader))
293 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
295 if (audit_session_is_valid(s->audit_id))
296 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
298 if (dual_timestamp_is_set(&s->timestamp))
300 "REALTIME="USEC_FMT"\n"
301 "MONOTONIC="USEC_FMT"\n",
302 s->timestamp.realtime,
303 s->timestamp.monotonic);
306 fprintf(f, "CONTROLLER=%s\n", s->controller);
307 session_save_devices(s, f);
310 r = fflush_and_check(f);
314 if (rename(temp_path, s->state_file) < 0) {
322 (void) unlink(s->state_file);
325 (void) unlink(temp_path);
327 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
330 static int session_load_devices(Session *s, const char *devices) {
336 for (p = devices;;) {
337 _cleanup_free_ char *word = NULL;
342 k = extract_first_word(&p, &word, NULL, 0);
350 k = parse_dev(word, &dev);
356 /* The file descriptors for loaded devices will be reattached later. */
357 k = session_device_new(s, dev, false, &sd);
363 log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
368 int session_load(Session *s) {
369 _cleanup_free_ char *remote = NULL,
388 r = parse_env_file(s->state_file, NEWLINE,
391 #if 0 /// elogind does not support systemd scope_jobs
392 "SCOPE_JOB", &s->scope_job,
394 "FIFO", &s->fifo_path,
397 "DISPLAY", &s->display,
398 "REMOTE_HOST", &s->remote_host,
399 "REMOTE_USER", &s->remote_user,
400 "SERVICE", &s->service,
401 "DESKTOP", &s->desktop,
404 "POSITION", &position,
409 "REALTIME", &realtime,
410 "MONOTONIC", &monotonic,
411 "CONTROLLER", &controller,
417 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
424 log_error("UID not specified for session %s", s->id);
428 r = parse_uid(uid, &u);
430 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
434 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
436 log_error("User of session %s not known.", s->id);
440 session_set_user(s, user);
444 k = parse_boolean(remote);
450 safe_atou(vtnr, &s->vtnr);
452 if (seat && !s->seat) {
455 o = hashmap_get(s->manager->seats, seat);
457 r = seat_attach_session(o, s);
459 log_error("Cannot attach session %s to seat %s", s->id, seat);
462 if (!s->seat || !seat_has_vts(s->seat))
465 if (position && s->seat) {
468 safe_atou(position, &npos);
469 seat_claim_position(s->seat, s, npos);
473 if (parse_pid(leader, &s->leader) >= 0)
474 (void) audit_session_from_pid(s->leader, &s->audit_id);
480 t = session_type_from_string(type);
488 c = session_class_from_string(class);
493 if (state && streq(state, "closing"))
499 /* If we open an unopened pipe for reading we will not
500 get an EOF. to trigger an EOF we hence open it for
501 writing, but close it right away which then will
502 trigger the EOF. This will happen immediately if no
503 other process has the FIFO open for writing, i. e.
504 when the session died before logind (re)started. */
506 fd = session_create_fifo(s);
511 timestamp_deserialize(realtime, &s->timestamp.realtime);
513 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
516 k = parse_boolean(active);
522 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
523 session_set_controller(s, controller, false, false);
524 session_load_devices(s, devices);
526 session_restore_vt(s);
532 int session_activate(Session *s) {
533 unsigned int num_pending;
541 if (s->seat->active == s)
544 /* on seats with VTs, we let VTs manage session-switching */
545 if (seat_has_vts(s->seat)) {
549 return chvt(s->vtnr);
552 /* On seats without VTs, we implement session-switching in logind. We
553 * try to pause all session-devices and wait until the session
554 * controller acknowledged them. Once all devices are asleep, we simply
555 * switch the active session and be done.
556 * We save the session we want to switch to in seat->pending_switch and
557 * seat_complete_switch() will perform the final switch. */
559 s->seat->pending_switch = s;
561 /* if no devices are running, immediately perform the session switch */
562 num_pending = session_device_try_pause_all(s);
564 seat_complete_switch(s->seat);
569 #if 0 /// UNNEEDED by elogind
570 static int session_start_scope(Session *s) {
577 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
578 char *scope, *job = NULL;
579 const char *description;
581 scope = strjoin("session-", s->id, ".scope");
585 description = strjoina("Session ", s->id, " of user ", s->user->name);
587 r = manager_start_scope(
593 "systemd-logind.service",
594 "systemd-user-sessions.service",
595 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
599 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
611 (void) hashmap_put(s->manager->session_units, s->scope, s);
616 static int session_start_cgroup(Session *s) {
621 assert(s->leader > 0);
623 /* First, create our own group */
624 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
626 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
628 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
630 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
636 int session_start(Session *s) {
647 r = user_start(s->user);
652 #if 0 /// elogind does its own session management
653 r = session_start_scope(s);
655 r = session_start_cgroup(s);
660 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
661 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
662 "SESSION_ID=%s", s->id,
663 "USER_ID=%s", s->user->name,
664 "LEADER="PID_FMT, s->leader,
665 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
668 if (!dual_timestamp_is_set(&s->timestamp))
669 dual_timestamp_get(&s->timestamp);
672 seat_read_active_vt(s->seat);
676 user_elect_display(s->user);
685 session_send_signal(s, true);
686 user_send_changed(s->user, "Display", NULL);
688 if (s->seat->active == s)
689 seat_send_changed(s->seat, "ActiveSession", NULL);
695 #if 0 /// UNNEEDED by elogind
696 static int session_stop_scope(Session *s, bool force) {
697 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
705 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
706 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
707 * when killing any processes left after this point. */
708 r = manager_abandon_scope(s->manager, s->scope, &error);
710 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
712 /* Optionally, let's kill everything that's left now. */
713 if (force || manager_shall_kill(s->manager, s->user->name)) {
716 r = manager_stop_unit(s->manager, s->scope, &error, &job);
718 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
723 s->scope_job = mfree(s->scope_job);
728 static int session_stop_cgroup(Session *s, bool force) {
729 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
734 if (force || manager_shall_kill(s->manager, s->user->name)) {
735 r = session_kill(s, KILL_ALL, SIGTERM);
744 int session_stop(Session *s, bool force) {
752 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
755 seat_evict_position(s->seat, s);
757 /* We are going down, don't care about FIFOs anymore */
758 session_remove_fifo(s);
761 #if 0 /// elogind does not start scopes, but sessions
762 r = session_stop_scope(s, force);
764 r = session_stop_cgroup(s, force);
769 user_elect_display(s->user);
774 #if 1 /// elogind must queue this session again
775 session_add_to_gc_queue(s);
780 int session_finalize(Session *s) {
789 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
790 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
791 "SESSION_ID=%s", s->id,
792 "USER_ID=%s", s->user->name,
793 "LEADER="PID_FMT, s->leader,
794 LOG_MESSAGE("Removed session %s.", s->id),
797 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
800 seat_evict_position(s->seat, s);
802 /* Kill session devices */
803 while ((sd = hashmap_first(s->devices)))
804 session_device_free(sd);
806 (void) unlink(s->state_file);
807 session_add_to_gc_queue(s);
808 user_add_to_gc_queue(s->user);
811 session_send_signal(s, false);
816 if (s->seat->active == s)
817 seat_set_active(s->seat, NULL);
823 user_send_changed(s->user, "Display", NULL);
828 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
829 Session *s = userdata;
834 session_stop(s, false);
838 int session_release(Session *s) {
841 if (!s->started || s->stopping)
844 if (s->timer_event_source)
847 return sd_event_add_time(s->manager->event,
848 &s->timer_event_source,
850 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
851 release_timeout_callback, s);
854 bool session_is_active(Session *s) {
860 return s->seat->active == s;
863 static int get_tty_atime(const char *tty, usec_t *atime) {
864 _cleanup_free_ char *p = NULL;
870 if (!path_is_absolute(tty)) {
871 p = strappend("/dev/", tty);
876 } else if (!path_startswith(tty, "/dev/"))
879 if (lstat(tty, &st) < 0)
882 *atime = timespec_load(&st.st_atim);
886 static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
887 _cleanup_free_ char *p = NULL;
893 r = get_ctty(pid, NULL, &p);
897 return get_tty_atime(p, atime);
900 int session_get_idle_hint(Session *s, dual_timestamp *t) {
906 /* Explicit idle hint is set */
909 *t = s->idle_hint_timestamp;
914 /* Graphical sessions should really implement a real
916 if (SESSION_TYPE_IS_GRAPHICAL(s->type))
919 /* For sessions with an explicitly configured tty, let's check
922 r = get_tty_atime(s->tty, &atime);
927 /* For sessions with a leader but no explicitly configured
928 * tty, let's check the controlling tty of the leader */
930 r = get_process_ctty_atime(s->leader, &atime);
937 *t = s->idle_hint_timestamp;
943 dual_timestamp_from_realtime(t, atime);
945 n = now(CLOCK_REALTIME);
947 if (s->manager->idle_action_usec <= 0)
950 return atime + s->manager->idle_action_usec <= n;
953 void session_set_idle_hint(Session *s, bool b) {
956 if (s->idle_hint == b)
960 dual_timestamp_get(&s->idle_hint_timestamp);
962 session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
965 seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
967 user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
968 manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
971 int session_get_locked_hint(Session *s) {
974 return s->locked_hint;
977 void session_set_locked_hint(Session *s, bool b) {
980 if (s->locked_hint == b)
985 session_send_changed(s, "LockedHint", NULL);
988 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
989 Session *s = userdata;
992 assert(s->fifo_fd == fd);
994 /* EOF on the FIFO means the session died abnormally. */
996 session_remove_fifo(s);
997 session_stop(s, false);
1002 int session_create_fifo(Session *s) {
1008 if (!s->fifo_path) {
1009 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
1013 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
1016 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
1020 /* Open reading side */
1021 if (s->fifo_fd < 0) {
1022 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
1028 if (!s->fifo_event_source) {
1029 r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
1033 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
1035 r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1040 /* Open writing side */
1041 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
1048 static void session_remove_fifo(Session *s) {
1051 s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
1052 s->fifo_fd = safe_close(s->fifo_fd);
1055 unlink(s->fifo_path);
1056 s->fifo_path = mfree(s->fifo_path);
1060 bool session_check_gc(Session *s, bool drop_not_started) {
1063 if (drop_not_started && !s->started)
1069 if (s->fifo_fd >= 0) {
1070 if (pipe_eof(s->fifo_fd) <= 0)
1074 #if 0 /// elogind supports neither scopes nor jobs
1075 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1078 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1085 void session_add_to_gc_queue(Session *s) {
1091 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1092 s->in_gc_queue = true;
1095 SessionState session_get_state(Session *s) {
1098 /* always check closing first */
1099 if (s->stopping || s->timer_event_source)
1100 return SESSION_CLOSING;
1102 #if 0 /// elogind does not support systemd scope_jobs
1103 if (s->scope_job || s->fifo_fd < 0)
1107 return SESSION_OPENING;
1109 if (session_is_active(s))
1110 return SESSION_ACTIVE;
1112 return SESSION_ONLINE;
1115 int session_kill(Session *s, KillWho who, int signo) {
1118 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1122 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1124 if (who == KILL_LEADER) {
1128 /* FIXME: verify that leader is in cgroup? */
1130 if (kill(s->leader, signo) < 0) {
1131 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1135 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1136 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1141 static int session_open_vt(Session *s) {
1142 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1150 sprintf(path, "/dev/tty%u", s->vtnr);
1151 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1153 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1158 int session_prepare_vt(Session *s) {
1160 struct vt_mode mode = { 0 };
1165 vt = session_open_vt(s);
1169 r = fchown(vt, s->user->uid, -1);
1171 r = log_error_errno(errno,
1172 "Cannot change owner of /dev/tty%u: %m",
1177 r = ioctl(vt, KDSKBMODE, K_OFF);
1179 r = log_error_errno(errno,
1180 "Cannot set K_OFF on /dev/tty%u: %m",
1185 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1187 r = log_error_errno(errno,
1188 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1193 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1194 * So we need a dummy handler here which just acknowledges *all* VT
1195 * switch requests. */
1196 mode.mode = VT_PROCESS;
1197 mode.relsig = SIGRTMIN;
1198 mode.acqsig = SIGRTMIN + 1;
1199 r = ioctl(vt, VT_SETMODE, &mode);
1201 r = log_error_errno(errno,
1202 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1210 session_restore_vt(s);
1214 void session_restore_vt(Session *s) {
1216 static const struct vt_mode mode = {
1220 _cleanup_free_ char *utf8 = NULL;
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);