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git.ipfire.org Git - thirdparty/systemd.git/blob - src/login/logind-seat.c
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"
35 Seat
*seat_new(Manager
*m
, const char *id
) {
45 s
->state_file
= strappend("/run/systemd/seats/", id
);
51 s
->id
= file_name_from_path(s
->state_file
);
54 if (hashmap_put(m
->seats
, s
->id
, s
) < 0) {
63 void seat_free(Seat
*s
) {
67 LIST_REMOVE(Seat
, gc_queue
, s
->manager
->seat_gc_queue
, s
);
70 session_free(s
->sessions
);
75 device_free(s
->devices
);
77 hashmap_remove(s
->manager
->seats
, s
->id
);
83 int seat_save(Seat
*s
) {
93 r
= safe_mkdir("/run/systemd/seats", 0755, 0, 0);
97 r
= fopen_temporary(s
->state_file
, &f
, &temp_path
);
101 fchmod(fileno(f
), 0644);
104 "# This is private data. Do not parse.\n"
106 "CAN_MULTI_SESSION=%i\n",
107 seat_is_vtconsole(s
),
108 seat_can_multi_session(s
));
111 assert(s
->active
->user
);
117 (unsigned long) s
->active
->user
->uid
);
123 fputs("SESSIONS=", f
);
124 LIST_FOREACH(sessions_by_seat
, i
, s
->sessions
) {
128 i
->sessions_by_seat_next
? ' ' : '\n');
132 LIST_FOREACH(sessions_by_seat
, i
, s
->sessions
)
135 (unsigned long) i
->user
->uid
,
136 i
->sessions_by_seat_next
? ' ' : '\n');
141 if (ferror(f
) || rename(temp_path
, s
->state_file
) < 0) {
143 unlink(s
->state_file
);
152 log_error("Failed to save seat data for %s: %s", s
->id
, strerror(-r
));
157 int seat_load(Seat
*s
) {
160 /* There isn't actually anything to read here ... */
165 static int vt_allocate(int vtnr
) {
171 if (asprintf(&p
, "/dev/tty%i", vtnr
) < 0)
174 fd
= open_terminal(p
, O_RDWR
|O_NOCTTY
|O_CLOEXEC
);
177 r
= fd
< 0 ? -errno
: 0;
180 close_nointr_nofail(fd
);
185 int seat_preallocate_vts(Seat
*s
) {
192 log_debug("Preallocating VTs...");
194 if (s
->manager
->n_autovts
<= 0)
197 if (!seat_can_multi_session(s
))
200 for (i
= 1; i
<= s
->manager
->n_autovts
; i
++) {
205 log_error("Failed to preallocate VT %i: %s", i
, strerror(-q
));
213 int seat_apply_acls(Seat
*s
, Session
*old_active
) {
218 r
= devnode_acl_all(s
->manager
->udev
,
221 !!old_active
, old_active
? old_active
->user
->uid
: 0,
222 !!s
->active
, s
->active
? s
->active
->user
->uid
: 0);
225 log_error("Failed to apply ACLs: %s", strerror(-r
));
230 int seat_set_active(Seat
*s
, Session
*session
) {
234 assert(!session
|| session
->seat
== s
);
236 if (session
== s
->active
)
239 old_active
= s
->active
;
242 seat_apply_acls(s
, old_active
);
244 if (session
&& session
->started
)
245 session_send_changed(session
, "Active\0");
247 if (!session
|| session
->started
)
248 seat_send_changed(s
, "ActiveSession\0");
253 session_save(session
);
254 user_save(session
->user
);
258 session_save(old_active
);
259 user_save(old_active
->user
);
265 int seat_active_vt_changed(Seat
*s
, int vtnr
) {
266 Session
*i
, *new_active
= NULL
;
272 if (!seat_can_multi_session(s
))
275 log_debug("VT changed to %i", vtnr
);
277 LIST_FOREACH(sessions_by_seat
, i
, s
->sessions
)
278 if (i
->vtnr
== vtnr
) {
283 r
= seat_set_active(s
, new_active
);
284 manager_spawn_autovt(s
->manager
, vtnr
);
289 int seat_read_active_vt(Seat
*s
) {
296 if (!seat_can_multi_session(s
))
299 lseek(s
->manager
->console_active_fd
, SEEK_SET
, 0);
301 k
= read(s
->manager
->console_active_fd
, t
, sizeof(t
)-1);
303 log_error("Failed to read current console: %s", k
< 0 ? strerror(-errno
) : "EOF");
304 return k
< 0 ? -errno
: -EIO
;
310 if (!startswith(t
, "tty")) {
311 log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
315 r
= safe_atoi(t
+3, &vtnr
);
317 log_error("Failed to parse VT number %s", t
+3);
322 log_error("VT number invalid: %s", t
+3);
326 return seat_active_vt_changed(s
, vtnr
);
329 int seat_start(Seat
*s
) {
335 log_info("New seat %s.", s
->id
);
337 /* Initialize VT magic stuff */
338 seat_preallocate_vts(s
);
340 /* Read current VT */
341 seat_read_active_vt(s
);
348 seat_send_signal(s
, true);
353 int seat_stop(Seat
*s
) {
359 log_info("Removed seat %s.", s
->id
);
361 seat_stop_sessions(s
);
363 unlink(s
->state_file
);
364 seat_add_to_gc_queue(s
);
367 seat_send_signal(s
, false);
374 int seat_stop_sessions(Seat
*s
) {
380 LIST_FOREACH(sessions_by_seat
, session
, s
->sessions
) {
381 k
= session_stop(session
);
389 int seat_attach_session(Seat
*s
, Session
*session
) {
392 assert(!session
->seat
);
395 LIST_PREPEND(Session
, sessions_by_seat
, s
->sessions
, session
);
397 seat_send_changed(s
, "Sessions\0");
399 /* Note that even if a seat is not multi-session capable it
400 * still might have multiple sessions on it since old, dead
401 * sessions might continue to be tracked until all their
402 * processes are gone. The most recently added session
403 * (i.e. the first in s->sessions) is the one that matters. */
405 if (!seat_can_multi_session(s
))
406 seat_set_active(s
, session
);
411 bool seat_is_vtconsole(Seat
*s
) {
414 return s
->manager
->vtconsole
== s
;
417 bool seat_can_multi_session(Seat
*s
) {
420 if (!seat_is_vtconsole(s
))
423 /* If we can't watch which VT is in the foreground, we don't
424 * support VT switching */
426 return s
->manager
->console_active_fd
>= 0;
429 int seat_get_idle_hint(Seat
*s
, dual_timestamp
*t
) {
431 bool idle_hint
= true;
432 dual_timestamp ts
= { 0, 0 };
436 LIST_FOREACH(sessions_by_seat
, session
, s
->sessions
) {
440 ih
= session_get_idle_hint(session
, &k
);
446 if (k
.monotonic
< ts
.monotonic
)
452 } else if (idle_hint
) {
454 if (k
.monotonic
> ts
.monotonic
)
465 int seat_check_gc(Seat
*s
, bool drop_not_started
) {
468 if (drop_not_started
&& !s
->started
)
471 if (seat_is_vtconsole(s
))
477 void seat_add_to_gc_queue(Seat
*s
) {
483 LIST_PREPEND(Seat
, gc_queue
, s
->manager
->seat_gc_queue
, s
);
484 s
->in_gc_queue
= true;
487 static bool seat_name_valid_char(char c
) {
489 (c
>= 'a' && c
<= 'z') ||
490 (c
>= 'A' && c
<= 'Z') ||
491 (c
>= '0' && c
<= '9') ||
496 bool seat_name_is_valid(const char *name
) {
501 if (!startswith(name
, "seat"))
507 for (p
= name
; *p
; p
++)
508 if (!seat_name_valid_char(*p
))
511 if (strlen(name
) > 255)