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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/ioctl.h>
30 #include "logind-seat.h"
31 #include "logind-acl.h"
34 Seat *seat_new(Manager *m, const char *id) {
44 s->state_file = strappend("/run/systemd/seats/", id);
50 s->id = file_name_from_path(s->state_file);
53 if (hashmap_put(m->seats, s->id, s) < 0) {
62 void seat_free(Seat *s) {
66 LIST_REMOVE(Seat, gc_queue, s->manager->seat_gc_queue, s);
69 session_free(s->sessions);
74 device_free(s->devices);
76 hashmap_remove(s->manager->seats, s->id);
82 int seat_save(Seat *s) {
92 r = safe_mkdir("/run/systemd/seats", 0755, 0, 0);
96 r = fopen_temporary(s->state_file, &f, &temp_path);
100 fchmod(fileno(f), 0644);
103 "# This is private data. Do not parse.\n"
105 seat_is_vtconsole(s));
108 assert(s->active->user);
114 (unsigned long) s->active->user->uid);
120 fputs("SESSIONS=", f);
121 LIST_FOREACH(sessions_by_seat, i, s->sessions) {
125 i->sessions_by_seat_next ? ' ' : '\n');
129 LIST_FOREACH(sessions_by_seat, i, s->sessions)
132 (unsigned long) i->user->uid,
133 i->sessions_by_seat_next ? ' ' : '\n');
138 if (ferror(f) || rename(temp_path, s->state_file) < 0) {
140 unlink(s->state_file);
149 log_error("Failed to save seat data for %s: %s", s->id, strerror(-r));
154 int seat_load(Seat *s) {
157 /* There isn't actually anything to read here ... */
162 static int vt_allocate(int vtnr) {
168 if (asprintf(&p, "/dev/tty%i", vtnr) < 0)
171 fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
174 r = fd < 0 ? -errno : 0;
177 close_nointr_nofail(fd);
182 int seat_preallocate_vts(Seat *s) {
189 log_debug("Preallocating VTs...");
191 if (s->manager->n_autovts <= 0)
194 if (!seat_is_vtconsole(s))
197 for (i = 1; i <= s->manager->n_autovts; i++) {
202 log_error("Failed to preallocate VT %i: %s", i, strerror(-q));
210 int seat_apply_acls(Seat *s, Session *old_active) {
215 r = devnode_acl_all(s->manager->udev,
218 !!old_active, old_active ? old_active->user->uid : 0,
219 !!s->active, s->active ? s->active->user->uid : 0);
222 log_error("Failed to apply ACLs: %s", strerror(-r));
227 int seat_set_active(Seat *s, Session *session) {
231 assert(!session || session->seat == s);
233 if (session == s->active)
236 old_active = s->active;
239 seat_apply_acls(s, old_active);
241 if (session && session->started)
242 session_send_changed(session, "Active\0");
244 if (!session || session->started)
245 seat_send_changed(s, "ActiveSession\0");
250 session_save(session);
251 user_save(session->user);
255 session_save(old_active);
256 user_save(old_active->user);
262 int seat_active_vt_changed(Seat *s, int vtnr) {
263 Session *i, *new_active = NULL;
269 if (!seat_is_vtconsole(s))
272 log_debug("VT changed to %i", vtnr);
274 LIST_FOREACH(sessions_by_seat, i, s->sessions)
275 if (i->vtnr == vtnr) {
280 r = seat_set_active(s, new_active);
281 manager_spawn_autovt(s->manager, vtnr);
286 int seat_read_active_vt(Seat *s) {
293 if (!seat_is_vtconsole(s))
296 lseek(s->manager->console_active_fd, SEEK_SET, 0);
298 k = read(s->manager->console_active_fd, t, sizeof(t)-1);
300 log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
301 return k < 0 ? -errno : -EIO;
307 if (!startswith(t, "tty")) {
308 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
312 r = safe_atoi(t+3, &vtnr);
314 log_error("Failed to parse VT number %s", t+3);
319 log_error("VT number invalid: %s", t+3);
323 return seat_active_vt_changed(s, vtnr);
326 int seat_start(Seat *s) {
332 log_info("New seat %s.", s->id);
334 /* Initialize VT magic stuff */
335 seat_preallocate_vts(s);
337 /* Read current VT */
338 seat_read_active_vt(s);
345 seat_send_signal(s, true);
350 int seat_stop(Seat *s) {
356 log_info("Removed seat %s.", s->id);
358 seat_stop_sessions(s);
360 unlink(s->state_file);
361 seat_add_to_gc_queue(s);
364 seat_send_signal(s, false);
371 int seat_stop_sessions(Seat *s) {
377 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
378 k = session_stop(session);
386 int seat_attach_session(Seat *s, Session *session) {
389 assert(!session->seat);
391 if (!seat_is_vtconsole(s) && s->sessions)
395 LIST_PREPEND(Session, sessions_by_seat, s->sessions, session);
397 seat_send_changed(s, "Sessions\0");
399 if (!seat_is_vtconsole(s)) {
401 seat_set_active(s, session);
407 bool seat_is_vtconsole(Seat *s) {
410 return s->manager->vtconsole == s;
413 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
415 bool idle_hint = true;
416 dual_timestamp ts = { 0, 0 };
420 LIST_FOREACH(sessions_by_seat, session, s->sessions) {
424 ih = session_get_idle_hint(session, &k);
430 if (k.monotonic < ts.monotonic)
436 } else if (idle_hint) {
438 if (k.monotonic > ts.monotonic)
449 int seat_check_gc(Seat *s, bool drop_not_started) {
452 if (drop_not_started && !s->started)
455 if (seat_is_vtconsole(s))
461 void seat_add_to_gc_queue(Seat *s) {
467 LIST_PREPEND(Seat, gc_queue, s->manager->seat_gc_queue, s);
468 s->in_gc_queue = true;
471 static bool seat_name_valid_char(char c) {
473 (c >= 'a' && c <= 'z') ||
474 (c >= 'A' && c <= 'Z') ||
475 (c >= '0' && c <= '9') ||
480 bool seat_name_is_valid(const char *name) {
485 if (!startswith(name, "seat"))
491 for (p = name; *p; p++)
492 if (!seat_name_valid_char(*p))
495 if (strlen(name) > 255)