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 "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 static void session_save_devices(Session *s, FILE *f) {
161 if (!hashmap_isempty(s->devices)) {
162 fprintf(f, "DEVICES=");
163 HASHMAP_FOREACH(sd, s->devices, i)
164 fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
169 int session_save(Session *s) {
170 _cleanup_free_ char *temp_path = NULL;
171 _cleanup_fclose_ FILE *f = NULL;
182 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
186 r = fopen_temporary(s->state_file, &f, &temp_path);
192 fchmod(fileno(f), 0644);
195 "# This is private data. Do not parse.\n"
203 session_is_active(s),
204 session_state_to_string(session_get_state(s)),
208 fprintf(f, "TYPE=%s\n", session_type_to_string(s->type));
211 fprintf(f, "CLASS=%s\n", session_class_to_string(s->class));
214 fprintf(f, "SCOPE=%s\n", s->scope);
215 #if 0 /// elogind does not support systemd scope_jobs
217 fprintf(f, "SCOPE_JOB=%s\n", s->scope_job);
221 fprintf(f, "FIFO=%s\n", s->fifo_path);
224 fprintf(f, "SEAT=%s\n", s->seat->id);
227 fprintf(f, "TTY=%s\n", s->tty);
230 fprintf(f, "DISPLAY=%s\n", s->display);
232 if (s->remote_host) {
233 _cleanup_free_ char *escaped;
235 escaped = cescape(s->remote_host);
241 fprintf(f, "REMOTE_HOST=%s\n", escaped);
244 if (s->remote_user) {
245 _cleanup_free_ char *escaped;
247 escaped = cescape(s->remote_user);
253 fprintf(f, "REMOTE_USER=%s\n", escaped);
257 _cleanup_free_ char *escaped;
259 escaped = cescape(s->service);
265 fprintf(f, "SERVICE=%s\n", escaped);
269 _cleanup_free_ char *escaped;
272 escaped = cescape(s->desktop);
278 fprintf(f, "DESKTOP=%s\n", escaped);
281 if (s->seat && seat_has_vts(s->seat))
282 fprintf(f, "VTNR=%u\n", s->vtnr);
285 fprintf(f, "POSITION=%u\n", s->position);
288 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
291 fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id);
293 if (dual_timestamp_is_set(&s->timestamp))
295 "REALTIME="USEC_FMT"\n"
296 "MONOTONIC="USEC_FMT"\n",
297 s->timestamp.realtime,
298 s->timestamp.monotonic);
301 fprintf(f, "CONTROLLER=%s\n", s->controller);
302 session_save_devices(s, f);
305 r = fflush_and_check(f);
309 if (rename(temp_path, s->state_file) < 0) {
317 (void) unlink(s->state_file);
320 (void) unlink(temp_path);
322 return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
325 static int session_load_devices(Session *s, const char *devices) {
331 for (p = devices;;) {
332 _cleanup_free_ char *word = NULL;
337 k = extract_first_word(&p, &word, NULL, 0);
345 k = parse_dev(word, &dev);
351 /* The file descriptors for loaded devices will be reattached later. */
352 k = session_device_new(s, dev, false, &sd);
358 log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
363 int session_load(Session *s) {
364 _cleanup_free_ char *remote = NULL,
383 r = parse_env_file(s->state_file, NEWLINE,
386 #if 0 /// elogind does not support systemd scope_jobs
387 "SCOPE_JOB", &s->scope_job,
389 "FIFO", &s->fifo_path,
392 "DISPLAY", &s->display,
393 "REMOTE_HOST", &s->remote_host,
394 "REMOTE_USER", &s->remote_user,
395 "SERVICE", &s->service,
396 "DESKTOP", &s->desktop,
399 "POSITION", &position,
404 "REALTIME", &realtime,
405 "MONOTONIC", &monotonic,
406 "CONTROLLER", &controller,
412 return log_error_errno(r, "Failed to read %s: %m", s->state_file);
419 log_error("UID not specified for session %s", s->id);
423 r = parse_uid(uid, &u);
425 log_error("Failed to parse UID value %s for session %s.", uid, s->id);
429 user = hashmap_get(s->manager->users, UID_TO_PTR(u));
431 log_error("User of session %s not known.", s->id);
435 session_set_user(s, user);
439 k = parse_boolean(remote);
445 safe_atou(vtnr, &s->vtnr);
447 if (seat && !s->seat) {
450 o = hashmap_get(s->manager->seats, seat);
452 r = seat_attach_session(o, s);
454 log_error("Cannot attach session %s to seat %s", s->id, seat);
457 if (!s->seat || !seat_has_vts(s->seat))
460 if (position && s->seat) {
463 safe_atou(position, &npos);
464 seat_claim_position(s->seat, s, npos);
468 k = parse_pid(leader, &s->leader);
470 audit_session_from_pid(s->leader, &s->audit_id);
476 t = session_type_from_string(type);
484 c = session_class_from_string(class);
489 if (state && streq(state, "closing"))
495 /* If we open an unopened pipe for reading we will not
496 get an EOF. to trigger an EOF we hence open it for
497 writing, but close it right away which then will
498 trigger the EOF. This will happen immediately if no
499 other process has the FIFO open for writing, i. e.
500 when the session died before logind (re)started. */
502 fd = session_create_fifo(s);
507 timestamp_deserialize(realtime, &s->timestamp.realtime);
509 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
512 k = parse_boolean(active);
518 if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
519 session_set_controller(s, controller, false, false);
520 session_load_devices(s, devices);
522 session_restore_vt(s);
528 int session_activate(Session *s) {
529 unsigned int num_pending;
537 if (s->seat->active == s)
540 /* on seats with VTs, we let VTs manage session-switching */
541 if (seat_has_vts(s->seat)) {
545 return chvt(s->vtnr);
548 /* On seats without VTs, we implement session-switching in logind. We
549 * try to pause all session-devices and wait until the session
550 * controller acknowledged them. Once all devices are asleep, we simply
551 * switch the active session and be done.
552 * We save the session we want to switch to in seat->pending_switch and
553 * seat_complete_switch() will perform the final switch. */
555 s->seat->pending_switch = s;
557 /* if no devices are running, immediately perform the session switch */
558 num_pending = session_device_try_pause_all(s);
560 seat_complete_switch(s->seat);
565 #if 0 /// UNNEEDED by elogind
566 static int session_start_scope(Session *s) {
573 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
574 char *scope, *job = NULL;
575 const char *description;
577 scope = strjoin("session-", s->id, ".scope");
581 description = strjoina("Session ", s->id, " of user ", s->user->name);
583 r = manager_start_scope(
589 "systemd-logind.service",
590 "systemd-user-sessions.service",
591 (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */
595 log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r));
607 (void) hashmap_put(s->manager->session_units, s->scope, s);
612 static int session_start_cgroup(Session *s) {
617 assert(s->leader > 0);
619 /* First, create our own group */
620 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, s->id);
622 return log_error_errno(r, "Failed to create cgroup %s: %m", s->id);
624 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, s->id, s->leader);
626 log_warning_errno(r, "Failed to attach PID %d to cgroup %s: %m", s->leader, s->id);
632 int session_start(Session *s) {
643 r = user_start(s->user);
648 #if 0 /// elogind does its own session management
649 r = session_start_scope(s);
651 r = session_start_cgroup(s);
656 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
657 "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
658 "SESSION_ID=%s", s->id,
659 "USER_ID=%s", s->user->name,
660 "LEADER="PID_FMT, s->leader,
661 LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
664 if (!dual_timestamp_is_set(&s->timestamp))
665 dual_timestamp_get(&s->timestamp);
668 seat_read_active_vt(s->seat);
672 user_elect_display(s->user);
681 session_send_signal(s, true);
682 user_send_changed(s->user, "Display", NULL);
684 if (s->seat->active == s)
685 seat_send_changed(s->seat, "ActiveSession", NULL);
691 #if 0 /// UNNEEDED by elogind
692 static int session_stop_scope(Session *s, bool force) {
693 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
701 /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
702 * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
703 * when killing any processes left after this point. */
704 r = manager_abandon_scope(s->manager, s->scope, &error);
706 log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
708 /* Optionally, let's kill everything that's left now. */
709 if (force || manager_shall_kill(s->manager, s->user->name)) {
712 r = manager_stop_unit(s->manager, s->scope, &error, &job);
714 return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
719 s->scope_job = mfree(s->scope_job);
724 static int session_stop_cgroup(Session *s, bool force) {
725 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
730 if (force || manager_shall_kill(s->manager, s->user->name)) {
731 r = session_kill(s, KILL_ALL, SIGTERM);
740 int session_stop(Session *s, bool force) {
748 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
751 seat_evict_position(s->seat, s);
753 /* We are going down, don't care about FIFOs anymore */
754 session_remove_fifo(s);
757 #if 0 /// elogind does not start scopes, but sessions
758 r = session_stop_scope(s, force);
760 r = session_stop_cgroup(s, force);
765 user_elect_display(s->user);
773 int session_finalize(Session *s) {
782 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
783 "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
784 "SESSION_ID=%s", s->id,
785 "USER_ID=%s", s->user->name,
786 "LEADER="PID_FMT, s->leader,
787 LOG_MESSAGE("Removed session %s.", s->id),
790 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
793 seat_evict_position(s->seat, s);
795 /* Kill session devices */
796 while ((sd = hashmap_first(s->devices)))
797 session_device_free(sd);
799 (void) unlink(s->state_file);
800 session_add_to_gc_queue(s);
801 user_add_to_gc_queue(s->user);
804 session_send_signal(s, false);
809 if (s->seat->active == s)
810 seat_set_active(s->seat, NULL);
816 user_send_changed(s->user, "Display", NULL);
821 #if 0 /// UNNEEDED by elogind
822 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
823 Session *s = userdata;
828 session_stop(s, false);
833 int session_release(Session *s) {
836 if (!s->started || s->stopping)
839 if (s->timer_event_source)
842 #if 0 /// UNNEEDED by elogind
843 return sd_event_add_time(s->manager->event,
844 &s->timer_event_source,
846 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
847 release_timeout_callback, s);
849 /* In systemd, session release is triggered by user jobs
850 dying. In elogind we don't have that so go ahead and stop
852 return session_stop(s, false);
856 bool session_is_active(Session *s) {
862 return s->seat->active == s;
865 static int get_tty_atime(const char *tty, usec_t *atime) {
866 _cleanup_free_ char *p = NULL;
872 if (!path_is_absolute(tty)) {
873 p = strappend("/dev/", tty);
878 } else if (!path_startswith(tty, "/dev/"))
881 if (lstat(tty, &st) < 0)
884 *atime = timespec_load(&st.st_atim);
888 static int get_process_ctty_atime(pid_t pid, usec_t *atime) {
889 _cleanup_free_ char *p = NULL;
895 r = get_ctty(pid, NULL, &p);
899 return get_tty_atime(p, atime);
902 int session_get_idle_hint(Session *s, dual_timestamp *t) {
908 /* Explicit idle hint is set */
911 *t = s->idle_hint_timestamp;
916 /* Graphical sessions should really implement a real
918 if (SESSION_TYPE_IS_GRAPHICAL(s->type))
921 /* For sessions with an explicitly configured tty, let's check
924 r = get_tty_atime(s->tty, &atime);
929 /* For sessions with a leader but no explicitly configured
930 * tty, let's check the controlling tty of the leader */
932 r = get_process_ctty_atime(s->leader, &atime);
939 *t = s->idle_hint_timestamp;
945 dual_timestamp_from_realtime(t, atime);
947 n = now(CLOCK_REALTIME);
949 if (s->manager->idle_action_usec <= 0)
952 return atime + s->manager->idle_action_usec <= n;
955 void session_set_idle_hint(Session *s, bool b) {
958 if (s->idle_hint == b)
962 dual_timestamp_get(&s->idle_hint_timestamp);
964 session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
967 seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
969 user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
970 manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
973 int session_get_locked_hint(Session *s) {
976 return s->locked_hint;
979 void session_set_locked_hint(Session *s, bool b) {
982 if (s->locked_hint == b)
987 session_send_changed(s, "LockedHint", NULL);
990 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
991 Session *s = userdata;
994 assert(s->fifo_fd == fd);
996 /* EOF on the FIFO means the session died abnormally. */
998 session_remove_fifo(s);
999 session_stop(s, false);
1004 int session_create_fifo(Session *s) {
1010 if (!s->fifo_path) {
1011 r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0);
1015 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
1018 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
1022 /* Open reading side */
1023 if (s->fifo_fd < 0) {
1024 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
1030 if (!s->fifo_event_source) {
1031 r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s);
1035 /* Let's make sure we noticed dead sessions before we process new bus requests (which might create new
1037 r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1042 /* Open writing side */
1043 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
1050 static void session_remove_fifo(Session *s) {
1053 s->fifo_event_source = sd_event_source_unref(s->fifo_event_source);
1054 s->fifo_fd = safe_close(s->fifo_fd);
1057 unlink(s->fifo_path);
1058 s->fifo_path = mfree(s->fifo_path);
1062 bool session_check_gc(Session *s, bool drop_not_started) {
1065 if (drop_not_started && !s->started)
1071 if (s->fifo_fd >= 0) {
1072 if (pipe_eof(s->fifo_fd) <= 0)
1076 #if 0 /// elogind supports neither scopes nor jobs
1077 if (s->scope_job && manager_job_is_active(s->manager, s->scope_job))
1080 if (s->scope && manager_unit_is_active(s->manager, s->scope))
1087 void session_add_to_gc_queue(Session *s) {
1093 LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s);
1094 s->in_gc_queue = true;
1097 SessionState session_get_state(Session *s) {
1100 /* always check closing first */
1101 if (s->stopping || s->timer_event_source)
1102 return SESSION_CLOSING;
1104 #if 0 /// elogind does not support systemd scope_jobs
1105 if (s->scope_job || s->fifo_fd < 0)
1109 return SESSION_OPENING;
1111 if (session_is_active(s))
1112 return SESSION_ACTIVE;
1114 return SESSION_ONLINE;
1117 int session_kill(Session *s, KillWho who, int signo) {
1120 #if 0 /// Without direct cgroup support, elogind can not kill sessions
1124 return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
1126 if (who == KILL_LEADER) {
1130 /* FIXME: verify that leader is in cgroup? */
1132 if (kill(s->leader, signo) < 0) {
1133 return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
1137 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
1138 CGROUP_IGNORE_SELF | CGROUP_REMOVE,
1143 static int session_open_vt(Session *s) {
1144 char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
1152 sprintf(path, "/dev/tty%u", s->vtnr);
1153 s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
1155 return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id);
1160 int session_prepare_vt(Session *s) {
1162 struct vt_mode mode = { 0 };
1167 vt = session_open_vt(s);
1171 r = fchown(vt, s->user->uid, -1);
1173 r = log_error_errno(errno,
1174 "Cannot change owner of /dev/tty%u: %m",
1179 r = ioctl(vt, KDSKBMODE, K_OFF);
1181 r = log_error_errno(errno,
1182 "Cannot set K_OFF on /dev/tty%u: %m",
1187 r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
1189 r = log_error_errno(errno,
1190 "Cannot set KD_GRAPHICS on /dev/tty%u: %m",
1195 /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS.
1196 * So we need a dummy handler here which just acknowledges *all* VT
1197 * switch requests. */
1198 mode.mode = VT_PROCESS;
1199 mode.relsig = SIGRTMIN;
1200 mode.acqsig = SIGRTMIN + 1;
1201 r = ioctl(vt, VT_SETMODE, &mode);
1203 r = log_error_errno(errno,
1204 "Cannot set VT_PROCESS on /dev/tty%u: %m",
1212 session_restore_vt(s);
1216 void session_restore_vt(Session *s) {
1218 static const struct vt_mode mode = {
1222 _cleanup_free_ char *utf8 = NULL;
1225 /* We need to get a fresh handle to the virtual terminal,
1226 * since the old file-descriptor is potentially in a hung-up
1227 * state after the controlling process exited; we do a
1228 * little dance to avoid having the terminal be available
1229 * for reuse before we've cleaned it up.
1234 vt = session_open_vt(s);
1240 (void) ioctl(vt, KDSETMODE, KD_TEXT);
1242 if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
1247 (void) ioctl(vt, KDSKBMODE, kb);
1249 (void) ioctl(vt, VT_SETMODE, &mode);
1250 (void) fchown(vt, 0, (gid_t) -1);
1252 s->vtfd = safe_close(s->vtfd);
1255 void session_leave_vt(Session *s) {
1260 /* This is called whenever we get a VT-switch signal from the kernel.
1261 * We acknowledge all of them unconditionally. Note that session are
1262 * free to overwrite those handlers and we only register them for
1263 * sessions with controllers. Legacy sessions are not affected.
1264 * However, if we switch from a non-legacy to a legacy session, we must
1265 * make sure to pause all device before acknowledging the switch. We
1266 * process the real switch only after we are notified via sysfs, so the
1267 * legacy session might have already started using the devices. If we
1268 * don't pause the devices before the switch, we might confuse the
1269 * session we switch to. */
1274 session_device_pause_all(s);
1275 r = ioctl(s->vtfd, VT_RELDISP, 1);
1277 log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
1280 bool session_is_controller(Session *s, const char *sender) {
1283 return streq_ptr(s->controller, sender);
1286 static void session_release_controller(Session *s, bool notify) {
1287 _cleanup_free_ char *name = NULL;
1293 name = s->controller;
1295 /* By resetting the controller before releasing the devices, we won't
1296 * send notification signals. This avoids sending useless notifications
1297 * if the controller is released on disconnects. */
1299 s->controller = NULL;
1301 while ((sd = hashmap_first(s->devices)))
1302 session_device_free(sd);
1304 s->controller = NULL;
1305 s->track = sd_bus_track_unref(s->track);
1308 static int on_bus_track(sd_bus_track *track, void *userdata) {
1309 Session *s = userdata;
1314 session_drop_controller(s);
1319 int session_set_controller(Session *s, const char *sender, bool force, bool prepare) {
1320 _cleanup_free_ char *name = NULL;
1326 if (session_is_controller(s, sender))
1328 if (s->controller && !force)
1331 name = strdup(sender);
1335 s->track = sd_bus_track_unref(s->track);
1336 r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s);
1340 r = sd_bus_track_add_name(s->track, name);
1344 /* When setting a session controller, we forcibly mute the VT and set
1345 * it into graphics-mode. Applications can override that by changing
1346 * VT state after calling TakeControl(). However, this serves as a good
1347 * default and well-behaving controllers can now ignore VTs entirely.
1348 * Note that we reset the VT on ReleaseControl() and if the controller
1350 * If logind crashes/restarts, we restore the controller during restart
1351 * (without preparing the VT since the controller has probably overridden
1352 * VT state by now) or reset the VT in case it crashed/exited, too. */
1354 r = session_prepare_vt(s);
1356 s->track = sd_bus_track_unref(s->track);
1361 session_release_controller(s, true);
1362 s->controller = name;
1369 void session_drop_controller(Session *s) {
1375 s->track = sd_bus_track_unref(s->track);
1376 session_release_controller(s, false);
1378 session_restore_vt(s);
1381 static const char* const session_state_table[_SESSION_STATE_MAX] = {
1382 [SESSION_OPENING] = "opening",
1383 [SESSION_ONLINE] = "online",
1384 [SESSION_ACTIVE] = "active",
1385 [SESSION_CLOSING] = "closing"
1388 DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState);
1390 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
1391 [SESSION_UNSPECIFIED] = "unspecified",
1392 [SESSION_TTY] = "tty",
1393 [SESSION_X11] = "x11",
1394 [SESSION_WAYLAND] = "wayland",
1395 [SESSION_MIR] = "mir",
1396 [SESSION_WEB] = "web",
1399 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
1401 static const char* const session_class_table[_SESSION_CLASS_MAX] = {
1402 [SESSION_USER] = "user",
1403 [SESSION_GREETER] = "greeter",
1404 [SESSION_LOCK_SCREEN] = "lock-screen",
1405 [SESSION_BACKGROUND] = "background"
1408 DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);
1410 static const char* const kill_who_table[_KILL_WHO_MAX] = {
1411 [KILL_LEADER] = "leader",
1415 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);