1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "sd-messages.h"
29 #include "alloc-util.h"
32 #include "formats-util.h"
33 #include "logind-acl.h"
34 #include "logind-seat.h"
36 #include "parse-util.h"
37 #include "string-util.h"
38 #include "terminal-util.h"
41 Seat *seat_new(Manager *m, const char *id) {
51 s->state_file = strappend("/run/systemd/seats/", id);
57 s->id = basename(s->state_file);
60 if (hashmap_put(m->seats, s->id, s) < 0) {
69 void seat_free(Seat *s) {
73 LIST_REMOVE(gc_queue, s->manager->seat_gc_queue, s);
76 session_free(s->sessions);
81 device_free(s->devices);
83 hashmap_remove(s->manager->seats, s->id);
90 int seat_save(Seat *s) {
91 _cleanup_free_ char *temp_path = NULL;
92 _cleanup_fclose_ FILE *f = NULL;
100 r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
104 r = fopen_temporary(s->state_file, &f, &temp_path);
108 fchmod(fileno(f), 0644);
111 "# This is private data. Do not parse.\n"
113 "CAN_MULTI_SESSION=%i\n"
115 "CAN_GRAPHICAL=%i\n",
117 seat_can_multi_session(s),
119 seat_can_graphical(s));
122 assert(s->active->user);
126 "ACTIVE_UID="UID_FMT"\n",
128 s->active->user->uid);
134 fputs("SESSIONS=", f);
135 LIST_FOREACH(sessions_by_seat, i, s->sessions) {
139 i->sessions_by_seat_next ? ' ' : '\n');
143 LIST_FOREACH(sessions_by_seat, i, s->sessions)
147 i->sessions_by_seat_next ? ' ' : '\n');
150 r = fflush_and_check(f);
154 if (rename(temp_path, s->state_file) < 0) {
162 (void) unlink(s->state_file);
165 (void) unlink(temp_path);
167 return log_error_errno(r, "Failed to save seat data %s: %m", s->state_file);
170 int seat_load(Seat *s) {
173 /* There isn't actually anything to read here ... */
178 /// UNNEEDED by elogind
180 static int vt_allocate(unsigned int vtnr) {
181 char p[sizeof("/dev/tty") + DECIMAL_STR_MAX(unsigned int)];
182 _cleanup_close_ int fd = -1;
186 snprintf(p, sizeof(p), "/dev/tty%u", vtnr);
187 fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
194 int seat_preallocate_vts(Seat *s) {
201 log_debug("Preallocating VTs...");
203 if (s->manager->n_autovts <= 0)
206 if (!seat_has_vts(s))
209 for (i = 1; i <= s->manager->n_autovts; i++) {
214 log_error_errno(q, "Failed to preallocate VT %u: %m", i);
223 int seat_apply_acls(Seat *s, Session *old_active) {
228 r = devnode_acl_all(s->manager->udev,
231 !!old_active, old_active ? old_active->user->uid : 0,
232 !!s->active, s->active ? s->active->user->uid : 0);
235 log_error_errno(r, "Failed to apply ACLs: %m");
240 int seat_set_active(Seat *s, Session *session) {
244 assert(!session || session->seat == s);
246 if (session == s->active)
249 old_active = s->active;
253 session_device_pause_all(old_active);
254 session_send_changed(old_active, "Active", NULL);
257 seat_apply_acls(s, old_active);
259 if (session && session->started) {
260 session_send_changed(session, "Active", NULL);
261 session_device_resume_all(session);
264 if (!session || session->started)
265 seat_send_changed(s, "ActiveSession", NULL);
270 session_save(session);
271 user_save(session->user);
275 session_save(old_active);
276 if (!session || session->user != old_active->user)
277 user_save(old_active->user);
283 int seat_switch_to(Seat *s, unsigned int num) {
284 /* Public session positions skip 0 (there is only F1-F12). Maybe it
285 * will get reassigned in the future, so return error for now. */
289 if (num >= s->position_count || !s->positions[num]) {
290 /* allow switching to unused VTs to trigger auto-activate */
291 if (seat_has_vts(s) && num < 64)
297 return session_activate(s->positions[num]);
300 int seat_switch_to_next(Seat *s) {
301 unsigned int start, i;
303 if (s->position_count == 0)
307 if (s->active && s->active->position > 0)
308 start = s->active->position;
310 for (i = start + 1; i < s->position_count; ++i)
312 return session_activate(s->positions[i]);
314 for (i = 1; i < start; ++i)
316 return session_activate(s->positions[i]);
321 int seat_switch_to_previous(Seat *s) {
322 unsigned int start, i;
324 if (s->position_count == 0)
328 if (s->active && s->active->position > 0)
329 start = s->active->position;
331 for (i = start - 1; i > 0; --i)
333 return session_activate(s->positions[i]);
335 for (i = s->position_count - 1; i > start; --i)
337 return session_activate(s->positions[i]);
342 int seat_active_vt_changed(Seat *s, unsigned int vtnr) {
343 Session *i, *new_active = NULL;
349 if (!seat_has_vts(s))
352 log_debug("VT changed to %u", vtnr);
354 /* we might have earlier closing sessions on the same VT, so try to
355 * find a running one first */
356 LIST_FOREACH(sessions_by_seat, i, s->sessions)
357 if (i->vtnr == vtnr && !i->stopping) {
363 /* no running one? then we can't decide which one is the
364 * active one, let the first one win */
365 LIST_FOREACH(sessions_by_seat, i, s->sessions)
366 if (i->vtnr == vtnr) {
372 r = seat_set_active(s, new_active);
374 /// elogind does not spawn autovt
376 manager_spawn_autovt(s->manager, vtnr);
382 int seat_read_active_vt(Seat *s) {
390 if (!seat_has_vts(s))
393 lseek(s->manager->console_active_fd, SEEK_SET, 0);
395 k = read(s->manager->console_active_fd, t, sizeof(t)-1);
397 log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
398 return k < 0 ? -errno : -EIO;
404 if (!startswith(t, "tty")) {
405 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
409 r = safe_atou(t+3, &vtnr);
411 log_error("Failed to parse VT number %s", t+3);
416 log_error("VT number invalid: %s", t+3);
420 return seat_active_vt_changed(s, vtnr);
423 int seat_start(Seat *s) {
430 LOG_MESSAGE_ID(SD_MESSAGE_SEAT_START),
432 LOG_MESSAGE("New seat %s.", s->id),
435 /* Initialize VT magic stuff */
436 /// elogind does not support autospawning vts
438 seat_preallocate_vts(s);
441 /* Read current VT */
442 seat_read_active_vt(s);
449 seat_send_signal(s, true);
454 int seat_stop(Seat *s, bool force) {
461 LOG_MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
463 LOG_MESSAGE("Removed seat %s.", s->id),
466 seat_stop_sessions(s, force);
468 unlink(s->state_file);
469 seat_add_to_gc_queue(s);
472 seat_send_signal(s, false);
479 int seat_stop_sessions(Seat *s, bool force) {
485 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
486 k = session_stop(session, force);
494 void seat_evict_position(Seat *s, Session *session) {
496 unsigned int pos = session->position;
498 session->position = 0;
503 if (pos < s->position_count && s->positions[pos] == session) {
504 s->positions[pos] = NULL;
506 /* There might be another session claiming the same
507 * position (eg., during gdm->session transition), so let's look
508 * for it and set it on the free slot. */
509 LIST_FOREACH(sessions_by_seat, iter, s->sessions) {
510 if (iter->position == pos && session_get_state(iter) != SESSION_CLOSING) {
511 s->positions[pos] = iter;
518 void seat_claim_position(Seat *s, Session *session, unsigned int pos) {
519 /* with VTs, the position is always the same as the VTnr */
523 if (!GREEDY_REALLOC0(s->positions, s->position_count, pos + 1))
526 seat_evict_position(s, session);
528 session->position = pos;
530 s->positions[pos] = session;
533 static void seat_assign_position(Seat *s, Session *session) {
536 if (session->position > 0)
539 for (pos = 1; pos < s->position_count; ++pos)
540 if (!s->positions[pos])
543 seat_claim_position(s, session, pos);
546 int seat_attach_session(Seat *s, Session *session) {
549 assert(!session->seat);
551 if (!seat_has_vts(s) != !session->vtnr)
555 LIST_PREPEND(sessions_by_seat, s->sessions, session);
556 seat_assign_position(s, session);
558 seat_send_changed(s, "Sessions", NULL);
560 /* On seats with VTs, the VT logic defines which session is active. On
561 * seats without VTs, we automatically activate new sessions. */
562 if (!seat_has_vts(s))
563 seat_set_active(s, session);
568 void seat_complete_switch(Seat *s) {
573 /* if no session-switch is pending or if it got canceled, do nothing */
574 if (!s->pending_switch)
577 session = s->pending_switch;
578 s->pending_switch = NULL;
580 seat_set_active(s, session);
583 bool seat_has_vts(Seat *s) {
586 return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
589 bool seat_is_seat0(Seat *s) {
592 return s->manager->seat0 == s;
595 bool seat_can_multi_session(Seat *s) {
598 return seat_has_vts(s);
601 bool seat_can_tty(Seat *s) {
604 return seat_has_vts(s);
607 bool seat_has_master_device(Seat *s) {
610 /* device list is ordered by "master" flag */
611 return !!s->devices && s->devices->master;
614 bool seat_can_graphical(Seat *s) {
617 return seat_has_master_device(s);
620 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
622 bool idle_hint = true;
623 dual_timestamp ts = DUAL_TIMESTAMP_NULL;
627 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
631 ih = session_get_idle_hint(session, &k);
637 if (k.monotonic > ts.monotonic)
643 } else if (idle_hint) {
645 if (k.monotonic > ts.monotonic)
656 bool seat_check_gc(Seat *s, bool drop_not_started) {
659 if (drop_not_started && !s->started)
662 if (seat_is_seat0(s))
665 return seat_has_master_device(s);
668 void seat_add_to_gc_queue(Seat *s) {
674 LIST_PREPEND(gc_queue, s->manager->seat_gc_queue, s);
675 s->in_gc_queue = true;
678 static bool seat_name_valid_char(char c) {
680 (c >= 'a' && c <= 'z') ||
681 (c >= 'A' && c <= 'Z') ||
682 (c >= '0' && c <= '9') ||
687 bool seat_name_is_valid(const char *name) {
692 if (!startswith(name, "seat"))
698 for (p = name; *p; p++)
699 if (!seat_name_valid_char(*p))
702 if (strlen(name) > 255)