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/>.
26 #include <sys/ioctl.h>
31 #include "sd-messages.h"
32 #include "logind-seat.h"
33 #include "logind-acl.h"
36 #include "path-util.h"
38 Seat *seat_new(Manager *m, const char *id) {
48 s->state_file = strappend("/run/systemd/seats/", id);
54 s->id = basename(s->state_file);
57 if (hashmap_put(m->seats, s->id, s) < 0) {
66 void seat_free(Seat *s) {
70 LIST_REMOVE(gc_queue, s->manager->seat_gc_queue, s);
73 session_free(s->sessions);
78 device_free(s->devices);
80 hashmap_remove(s->manager->seats, s->id);
87 int seat_save(Seat *s) {
88 _cleanup_free_ char *temp_path = NULL;
89 _cleanup_fclose_ FILE *f = NULL;
97 r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
101 r = fopen_temporary(s->state_file, &f, &temp_path);
105 fchmod(fileno(f), 0644);
108 "# This is private data. Do not parse.\n"
110 "CAN_MULTI_SESSION=%i\n"
112 "CAN_GRAPHICAL=%i\n",
114 seat_can_multi_session(s),
116 seat_can_graphical(s));
119 assert(s->active->user);
123 "ACTIVE_UID="UID_FMT"\n",
125 s->active->user->uid);
131 fputs("SESSIONS=", f);
132 LIST_FOREACH(sessions_by_seat, i, s->sessions) {
136 i->sessions_by_seat_next ? ' ' : '\n');
140 LIST_FOREACH(sessions_by_seat, i, s->sessions)
144 i->sessions_by_seat_next ? ' ' : '\n');
149 if (ferror(f) || rename(temp_path, s->state_file) < 0) {
151 unlink(s->state_file);
157 log_error("Failed to save seat data %s: %s", s->state_file, strerror(-r));
162 int seat_load(Seat *s) {
165 /* There isn't actually anything to read here ... */
170 static int vt_allocate(unsigned int vtnr) {
171 char p[sizeof("/dev/tty") + DECIMAL_STR_MAX(unsigned int)];
172 _cleanup_close_ int fd = -1;
176 snprintf(p, sizeof(p), "/dev/tty%u", vtnr);
177 fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
184 int seat_preallocate_vts(Seat *s) {
191 log_debug("Preallocating VTs...");
193 if (s->manager->n_autovts <= 0)
196 if (!seat_has_vts(s))
199 for (i = 1; i <= s->manager->n_autovts; i++) {
204 log_error("Failed to preallocate VT %i: %s", i, strerror(-q));
212 int seat_apply_acls(Seat *s, Session *old_active) {
217 r = devnode_acl_all(s->manager->udev,
220 !!old_active, old_active ? old_active->user->uid : 0,
221 !!s->active, s->active ? s->active->user->uid : 0);
224 log_error("Failed to apply ACLs: %s", strerror(-r));
229 int seat_set_active(Seat *s, Session *session) {
233 assert(!session || session->seat == s);
235 if (session == s->active)
238 old_active = s->active;
242 session_device_pause_all(old_active);
243 session_send_changed(old_active, "Active", NULL);
246 seat_apply_acls(s, old_active);
248 if (session && session->started) {
249 session_send_changed(session, "Active", NULL);
250 session_device_resume_all(session);
253 if (!session || session->started)
254 seat_send_changed(s, "ActiveSession", NULL);
259 session_save(session);
260 user_save(session->user);
264 session_save(old_active);
265 if (!session || session->user != old_active->user)
266 user_save(old_active->user);
272 int seat_switch_to(Seat *s, unsigned int num) {
273 /* Public session positions skip 0 (there is only F1-F12). Maybe it
274 * will get reassigned in the future, so return error for now. */
278 if (num >= s->position_count || !s->positions[num]) {
279 /* allow switching to unused VTs to trigger auto-activate */
280 if (seat_has_vts(s) && num < 64)
286 return session_activate(s->positions[num]);
289 int seat_switch_to_next(Seat *s) {
290 unsigned int start, i;
292 if (!s->position_count)
296 if (s->active && s->active->pos > 0)
297 start = s->active->pos;
299 for (i = start + 1; i < s->position_count; ++i)
301 return session_activate(s->positions[i]);
303 for (i = 1; i < start; ++i)
305 return session_activate(s->positions[i]);
310 int seat_switch_to_previous(Seat *s) {
311 unsigned int start, i;
313 if (!s->position_count)
317 if (s->active && s->active->pos > 0)
318 start = s->active->pos;
320 for (i = start - 1; i > 0; --i)
322 return session_activate(s->positions[i]);
324 for (i = s->position_count - 1; i > start; --i)
326 return session_activate(s->positions[i]);
331 int seat_active_vt_changed(Seat *s, unsigned int vtnr) {
332 Session *i, *new_active = NULL;
338 if (!seat_has_vts(s))
341 log_debug("VT changed to %u", vtnr);
343 LIST_FOREACH(sessions_by_seat, i, s->sessions)
344 if (i->vtnr == vtnr) {
349 r = seat_set_active(s, new_active);
350 manager_spawn_autovt(s->manager, vtnr);
355 int seat_read_active_vt(Seat *s) {
363 if (!seat_has_vts(s))
366 lseek(s->manager->console_active_fd, SEEK_SET, 0);
368 k = read(s->manager->console_active_fd, t, sizeof(t)-1);
370 log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
371 return k < 0 ? -errno : -EIO;
377 if (!startswith(t, "tty")) {
378 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
382 r = safe_atou(t+3, &vtnr);
384 log_error("Failed to parse VT number %s", t+3);
389 log_error("VT number invalid: %s", t+3);
393 return seat_active_vt_changed(s, vtnr);
396 int seat_start(Seat *s) {
403 MESSAGE_ID(SD_MESSAGE_SEAT_START),
405 "MESSAGE=New seat %s.", s->id,
408 /* Initialize VT magic stuff */
409 seat_preallocate_vts(s);
411 /* Read current VT */
412 seat_read_active_vt(s);
419 seat_send_signal(s, true);
424 int seat_stop(Seat *s, bool force) {
431 MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
433 "MESSAGE=Removed seat %s.", s->id,
436 seat_stop_sessions(s, force);
438 unlink(s->state_file);
439 seat_add_to_gc_queue(s);
442 seat_send_signal(s, false);
449 int seat_stop_sessions(Seat *s, bool force) {
455 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
456 k = session_stop(session, force);
464 void seat_evict_position(Seat *s, Session *session) {
466 unsigned int pos = session->pos;
473 if (pos < s->position_count && s->positions[pos] == session) {
474 s->positions[pos] = NULL;
476 /* There might be another session claiming the same
477 * position (eg., during gdm->session transition), so lets look
478 * for it and set it on the free slot. */
479 LIST_FOREACH(sessions_by_seat, iter, s->sessions) {
480 if (iter->pos == pos) {
481 s->positions[pos] = iter;
488 void seat_claim_position(Seat *s, Session *session, unsigned int pos) {
489 /* with VTs, the position is always the same as the VTnr */
493 if (!GREEDY_REALLOC0(s->positions, s->position_count, pos + 1))
496 seat_evict_position(s, session);
499 if (pos > 0 && !s->positions[pos])
500 s->positions[pos] = session;
503 static void seat_assign_position(Seat *s, Session *session) {
506 if (session->pos > 0)
509 for (pos = 1; pos < s->position_count; ++pos)
510 if (!s->positions[pos])
513 seat_claim_position(s, session, pos);
516 int seat_attach_session(Seat *s, Session *session) {
519 assert(!session->seat);
521 if (!seat_has_vts(s) != !session->vtnr)
525 LIST_PREPEND(sessions_by_seat, s->sessions, session);
526 seat_assign_position(s, session);
528 seat_send_changed(s, "Sessions", NULL);
530 /* On seats with VTs, the VT logic defines which session is active. On
531 * seats without VTs, we automatically activate new sessions. */
532 if (!seat_has_vts(s))
533 seat_set_active(s, session);
538 void seat_complete_switch(Seat *s) {
543 /* if no session-switch is pending or if it got canceled, do nothing */
544 if (!s->pending_switch)
547 session = s->pending_switch;
548 s->pending_switch = NULL;
550 seat_set_active(s, session);
553 bool seat_has_vts(Seat *s) {
556 return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
559 bool seat_is_seat0(Seat *s) {
562 return s->manager->seat0 == s;
565 bool seat_can_multi_session(Seat *s) {
568 return seat_has_vts(s);
571 bool seat_can_tty(Seat *s) {
574 return seat_has_vts(s);
577 bool seat_has_master_device(Seat *s) {
580 /* device list is ordered by "master" flag */
581 return !!s->devices && s->devices->master;
584 bool seat_can_graphical(Seat *s) {
587 return seat_has_master_device(s);
590 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
592 bool idle_hint = true;
593 dual_timestamp ts = { 0, 0 };
597 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
601 ih = session_get_idle_hint(session, &k);
607 if (k.monotonic > ts.monotonic)
613 } else if (idle_hint) {
615 if (k.monotonic > ts.monotonic)
626 bool seat_check_gc(Seat *s, bool drop_not_started) {
629 if (drop_not_started && !s->started)
632 if (seat_is_seat0(s))
635 return seat_has_master_device(s);
638 void seat_add_to_gc_queue(Seat *s) {
644 LIST_PREPEND(gc_queue, s->manager->seat_gc_queue, s);
645 s->in_gc_queue = true;
648 static bool seat_name_valid_char(char c) {
650 (c >= 'a' && c <= 'z') ||
651 (c >= 'A' && c <= 'Z') ||
652 (c >= '0' && c <= '9') ||
657 bool seat_name_is_valid(const char *name) {
662 if (!startswith(name, "seat"))
668 for (p = name; *p; p++)
669 if (!seat_name_valid_char(*p))
672 if (strlen(name) > 255)