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/>.
25 #include "sd-messages.h"
27 #include "alloc-util.h"
30 #include "formats-util.h"
31 #include "logind-acl.h"
32 #include "logind-seat.h"
34 #include "parse-util.h"
35 #include "stdio-util.h"
36 #include "string-util.h"
37 #include "terminal-util.h"
40 Seat *seat_new(Manager *m, const char *id) {
50 s->state_file = strappend("/run/systemd/seats/", id);
56 s->id = basename(s->state_file);
59 if (hashmap_put(m->seats, s->id, s) < 0) {
68 void seat_free(Seat *s) {
72 LIST_REMOVE(gc_queue, s->manager->seat_gc_queue, s);
75 session_free(s->sessions);
80 device_free(s->devices);
82 hashmap_remove(s->manager->seats, s->id);
89 int seat_save(Seat *s) {
90 _cleanup_free_ char *temp_path = NULL;
91 _cleanup_fclose_ FILE *f = NULL;
99 r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
103 r = fopen_temporary(s->state_file, &f, &temp_path);
107 fchmod(fileno(f), 0644);
110 "# This is private data. Do not parse.\n"
112 "CAN_MULTI_SESSION=%i\n"
114 "CAN_GRAPHICAL=%i\n",
116 seat_can_multi_session(s),
118 seat_can_graphical(s));
121 assert(s->active->user);
125 "ACTIVE_UID="UID_FMT"\n",
127 s->active->user->uid);
133 fputs("SESSIONS=", f);
134 LIST_FOREACH(sessions_by_seat, i, s->sessions) {
138 i->sessions_by_seat_next ? ' ' : '\n');
142 LIST_FOREACH(sessions_by_seat, i, s->sessions)
146 i->sessions_by_seat_next ? ' ' : '\n');
149 r = fflush_and_check(f);
153 if (rename(temp_path, s->state_file) < 0) {
161 (void) unlink(s->state_file);
164 (void) unlink(temp_path);
166 return log_error_errno(r, "Failed to save seat data %s: %m", s->state_file);
169 int seat_load(Seat *s) {
172 /* There isn't actually anything to read here ... */
177 #if 0 /// UNNEEDED by elogind
178 static int vt_allocate(unsigned int vtnr) {
179 char p[sizeof("/dev/tty") + DECIMAL_STR_MAX(unsigned int)];
180 _cleanup_close_ int fd = -1;
184 xsprintf(p, "/dev/tty%u", vtnr);
185 fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
192 int seat_preallocate_vts(Seat *s) {
199 log_debug("Preallocating VTs...");
201 if (s->manager->n_autovts <= 0)
204 if (!seat_has_vts(s))
207 for (i = 1; i <= s->manager->n_autovts; i++) {
212 log_error_errno(q, "Failed to preallocate VT %u: %m", i);
221 int seat_apply_acls(Seat *s, Session *old_active) {
226 r = devnode_acl_all(s->manager->udev,
229 !!old_active, old_active ? old_active->user->uid : 0,
230 !!s->active, s->active ? s->active->user->uid : 0);
233 log_error_errno(r, "Failed to apply ACLs: %m");
238 int seat_set_active(Seat *s, Session *session) {
242 assert(!session || session->seat == s);
244 if (session == s->active)
247 old_active = s->active;
251 session_device_pause_all(old_active);
252 session_send_changed(old_active, "Active", NULL);
255 seat_apply_acls(s, old_active);
257 if (session && session->started) {
258 session_send_changed(session, "Active", NULL);
259 session_device_resume_all(session);
262 if (!session || session->started)
263 seat_send_changed(s, "ActiveSession", NULL);
268 session_save(session);
269 user_save(session->user);
273 session_save(old_active);
274 if (!session || session->user != old_active->user)
275 user_save(old_active->user);
281 int seat_switch_to(Seat *s, unsigned int num) {
282 /* Public session positions skip 0 (there is only F1-F12). Maybe it
283 * will get reassigned in the future, so return error for now. */
287 if (num >= s->position_count || !s->positions[num]) {
288 /* allow switching to unused VTs to trigger auto-activate */
289 if (seat_has_vts(s) && num < 64)
295 return session_activate(s->positions[num]);
298 int seat_switch_to_next(Seat *s) {
299 unsigned int start, i;
301 if (s->position_count == 0)
305 if (s->active && s->active->position > 0)
306 start = s->active->position;
308 for (i = start + 1; i < s->position_count; ++i)
310 return session_activate(s->positions[i]);
312 for (i = 1; i < start; ++i)
314 return session_activate(s->positions[i]);
319 int seat_switch_to_previous(Seat *s) {
320 unsigned int start, i;
322 if (s->position_count == 0)
326 if (s->active && s->active->position > 0)
327 start = s->active->position;
329 for (i = start - 1; i > 0; --i)
331 return session_activate(s->positions[i]);
333 for (i = s->position_count - 1; i > start; --i)
335 return session_activate(s->positions[i]);
340 int seat_active_vt_changed(Seat *s, unsigned int vtnr) {
341 Session *i, *new_active = NULL;
347 if (!seat_has_vts(s))
350 log_debug("VT changed to %u", vtnr);
352 /* we might have earlier closing sessions on the same VT, so try to
353 * find a running one first */
354 LIST_FOREACH(sessions_by_seat, i, s->sessions)
355 if (i->vtnr == vtnr && !i->stopping) {
361 /* no running one? then we can't decide which one is the
362 * active one, let the first one win */
363 LIST_FOREACH(sessions_by_seat, i, s->sessions)
364 if (i->vtnr == vtnr) {
370 r = seat_set_active(s, new_active);
371 #if 0 /// elogind does not spawn autovt
372 manager_spawn_autovt(s->manager, vtnr);
378 int seat_read_active_vt(Seat *s) {
386 if (!seat_has_vts(s))
389 lseek(s->manager->console_active_fd, SEEK_SET, 0);
391 k = read(s->manager->console_active_fd, t, sizeof(t)-1);
393 log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
394 return k < 0 ? -errno : -EIO;
400 if (!startswith(t, "tty")) {
401 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
405 r = safe_atou(t+3, &vtnr);
407 log_error("Failed to parse VT number %s", t+3);
412 log_error("VT number invalid: %s", t+3);
416 return seat_active_vt_changed(s, vtnr);
419 int seat_start(Seat *s) {
426 LOG_MESSAGE_ID(SD_MESSAGE_SEAT_START),
428 LOG_MESSAGE("New seat %s.", s->id),
431 /* Initialize VT magic stuff */
432 #if 0 /// elogind does not support autospawning vts
433 seat_preallocate_vts(s);
436 /* Read current VT */
437 seat_read_active_vt(s);
444 seat_send_signal(s, true);
449 int seat_stop(Seat *s, bool force) {
456 LOG_MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
458 LOG_MESSAGE("Removed seat %s.", s->id),
461 seat_stop_sessions(s, force);
463 unlink(s->state_file);
464 seat_add_to_gc_queue(s);
467 seat_send_signal(s, false);
474 int seat_stop_sessions(Seat *s, bool force) {
480 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
481 k = session_stop(session, force);
489 void seat_evict_position(Seat *s, Session *session) {
491 unsigned int pos = session->position;
493 session->position = 0;
498 if (pos < s->position_count && s->positions[pos] == session) {
499 s->positions[pos] = NULL;
501 /* There might be another session claiming the same
502 * position (eg., during gdm->session transition), so let's look
503 * for it and set it on the free slot. */
504 LIST_FOREACH(sessions_by_seat, iter, s->sessions) {
505 if (iter->position == pos && session_get_state(iter) != SESSION_CLOSING) {
506 s->positions[pos] = iter;
513 void seat_claim_position(Seat *s, Session *session, unsigned int pos) {
514 /* with VTs, the position is always the same as the VTnr */
518 if (!GREEDY_REALLOC0(s->positions, s->position_count, pos + 1))
521 seat_evict_position(s, session);
523 session->position = pos;
525 s->positions[pos] = session;
528 static void seat_assign_position(Seat *s, Session *session) {
531 if (session->position > 0)
534 for (pos = 1; pos < s->position_count; ++pos)
535 if (!s->positions[pos])
538 seat_claim_position(s, session, pos);
541 int seat_attach_session(Seat *s, Session *session) {
544 assert(!session->seat);
546 if (!seat_has_vts(s) != !session->vtnr)
550 LIST_PREPEND(sessions_by_seat, s->sessions, session);
551 seat_assign_position(s, session);
553 seat_send_changed(s, "Sessions", NULL);
555 /* On seats with VTs, the VT logic defines which session is active. On
556 * seats without VTs, we automatically activate new sessions. */
557 if (!seat_has_vts(s))
558 seat_set_active(s, session);
563 void seat_complete_switch(Seat *s) {
568 /* if no session-switch is pending or if it got canceled, do nothing */
569 if (!s->pending_switch)
572 session = s->pending_switch;
573 s->pending_switch = NULL;
575 seat_set_active(s, session);
578 bool seat_has_vts(Seat *s) {
581 return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
584 bool seat_is_seat0(Seat *s) {
587 return s->manager->seat0 == s;
590 bool seat_can_multi_session(Seat *s) {
593 return seat_has_vts(s);
596 bool seat_can_tty(Seat *s) {
599 return seat_has_vts(s);
602 bool seat_has_master_device(Seat *s) {
605 /* device list is ordered by "master" flag */
606 return !!s->devices && s->devices->master;
609 bool seat_can_graphical(Seat *s) {
612 return seat_has_master_device(s);
615 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
617 bool idle_hint = true;
618 dual_timestamp ts = DUAL_TIMESTAMP_NULL;
622 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
626 ih = session_get_idle_hint(session, &k);
632 if (k.monotonic > ts.monotonic)
638 } else if (idle_hint) {
640 if (k.monotonic > ts.monotonic)
651 bool seat_check_gc(Seat *s, bool drop_not_started) {
654 if (drop_not_started && !s->started)
657 if (seat_is_seat0(s))
660 return seat_has_master_device(s);
663 void seat_add_to_gc_queue(Seat *s) {
669 LIST_PREPEND(gc_queue, s->manager->seat_gc_queue, s);
670 s->in_gc_queue = true;
673 static bool seat_name_valid_char(char c) {
675 (c >= 'a' && c <= 'z') ||
676 (c >= 'A' && c <= 'Z') ||
677 (c >= '0' && c <= '9') ||
682 bool seat_name_is_valid(const char *name) {
687 if (!startswith(name, "seat"))
693 for (p = name; *p; p++)
694 if (!seat_name_valid_char(*p))
697 if (strlen(name) > 255)