logind: introduce session-devices

[elogind.git] / src / login / logind-seat.c

diff --git a/src/login/logind-seat.c b/src/login/logind-seat.c
index 3cf3958c8d47330d13cac925573238713a54ef55..f88738ab1676c769d8d6bbb3b87be6059f75be3d 100644 (file)
--- a/src/login/logind-seat.c
+++ b/src/login/logind-seat.c
@@ -6,16 +6,16 @@
   Copyright 2011 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.
 
   systemd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
@@ -27,9 +27,13 @@
 #include <linux/vt.h>
 #include <string.h>
 
+#include "systemd/sd-id128.h"
+#include "systemd/sd-messages.h"
 #include "logind-seat.h"
 #include "logind-acl.h"
 #include "util.h"
+#include "mkdir.h"
+#include "path-util.h"
 
 Seat *seat_new(Manager *m, const char *id) {
         Seat *s;
@@ -47,7 +51,7 @@ Seat *seat_new(Manager *m, const char *id) {
                 return NULL;
         }
 
-        s->id = file_name_from_path(s->state_file);
+        s->id = path_get_file_name(s->state_file);
         s->manager = m;
 
         if (hashmap_put(m->seats, s->id, s) < 0) {
@@ -89,7 +93,7 @@ int seat_save(Seat *s) {
         if (!s->started)
                 return 0;
 
-        r = safe_mkdir("/run/systemd/seats", 0755, 0, 0);
+        r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
         if (r < 0)
                 goto finish;
 
@@ -101,8 +105,14 @@ int seat_save(Seat *s) {
 
         fprintf(f,
                 "# This is private data. Do not parse.\n"
-                "IS_VTCONSOLE=%i\n",
-                seat_is_vtconsole(s));
+                "IS_SEAT0=%i\n"
+                "CAN_MULTI_SESSION=%i\n"
+                "CAN_TTY=%i\n"
+                "CAN_GRAPHICAL=%i\n",
+                seat_is_seat0(s),
+                seat_can_multi_session(s),
+                seat_can_tty(s),
+                seat_can_graphical(s));
 
         if (s->active) {
                 assert(s->active->user);
@@ -191,7 +201,7 @@ int seat_preallocate_vts(Seat *s) {
         if (s->manager->n_autovts <= 0)
                 return 0;
 
-        if (!seat_is_vtconsole(s))
+        if (!seat_has_vts(s))
                 return 0;
 
         for (i = 1; i <= s->manager->n_autovts; i++) {
@@ -236,10 +246,15 @@ int seat_set_active(Seat *s, Session *session) {
         old_active = s->active;
         s->active = session;
 
+        if (old_active)
+                session_device_pause_all(old_active);
+
         seat_apply_acls(s, old_active);
 
-        if (session && session->started)
+        if (session && session->started) {
                 session_send_changed(session, "Active\0");
+                session_device_resume_all(session);
+        }
 
         if (!session || session->started)
                 seat_send_changed(s, "ActiveSession\0");
@@ -253,7 +268,8 @@ int seat_set_active(Seat *s, Session *session) {
 
         if (old_active) {
                 session_save(old_active);
-                user_save(old_active->user);
+                if (!session || session->user != old_active->user)
+                        user_save(old_active->user);
         }
 
         return 0;
@@ -266,7 +282,7 @@ int seat_active_vt_changed(Seat *s, int vtnr) {
         assert(s);
         assert(vtnr >= 1);
 
-        if (!seat_is_vtconsole(s))
+        if (!seat_has_vts(s))
                 return -EINVAL;
 
         log_debug("VT changed to %i", vtnr);
@@ -290,7 +306,7 @@ int seat_read_active_vt(Seat *s) {
 
         assert(s);
 
-        if (!seat_is_vtconsole(s))
+        if (!seat_has_vts(s))
                 return 0;
 
         lseek(s->manager->console_active_fd, SEEK_SET, 0);
@@ -329,7 +345,11 @@ int seat_start(Seat *s) {
         if (s->started)
                 return 0;
 
-        log_info("New seat %s.", s->id);
+        log_struct(LOG_INFO,
+                   MESSAGE_ID(SD_MESSAGE_SEAT_START),
+                   "SEAT_ID=%s", s->id,
+                   "MESSAGE=New seat %s.", s->id,
+                   NULL);
 
         /* Initialize VT magic stuff */
         seat_preallocate_vts(s);
@@ -353,7 +373,11 @@ int seat_stop(Seat *s) {
         assert(s);
 
         if (s->started)
-                log_info("Removed seat %s.", s->id);
+                log_struct(LOG_INFO,
+                           MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
+                           "SEAT_ID=%s", s->id,
+                           "MESSAGE=Removed seat %s.", s->id,
+                           NULL);
 
         seat_stop_sessions(s);
 
@@ -388,26 +412,54 @@ int seat_attach_session(Seat *s, Session *session) {
         assert(session);
         assert(!session->seat);
 
-        if (!seat_is_vtconsole(s) && s->sessions)
-                return -EEXIST;
-
         session->seat = s;
         LIST_PREPEND(Session, sessions_by_seat, s->sessions, session);
 
         seat_send_changed(s, "Sessions\0");
 
-        if (!seat_is_vtconsole(s)) {
-                assert(!s->active);
+        /* On seats with VTs, the VT logic defines which session is active. On
+         * seats without VTs, we automatically activate the first session. */
+        if (!seat_has_vts(s) && !s->active)
                 seat_set_active(s, session);
-        }
 
         return 0;
 }
 
-bool seat_is_vtconsole(Seat *s) {
+bool seat_has_vts(Seat *s) {
+        assert(s);
+
+        return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
+}
+
+bool seat_is_seat0(Seat *s) {
+        assert(s);
+
+        return s->manager->seat0 == s;
+}
+
+bool seat_can_multi_session(Seat *s) {
+        assert(s);
+
+        return seat_has_vts(s);
+}
+
+bool seat_can_tty(Seat *s) {
+        assert(s);
+
+        return seat_has_vts(s);
+}
+
+bool seat_has_master_device(Seat *s) {
+        assert(s);
+
+        /* device list is ordered by "master" flag */
+        return !!s->devices && s->devices->master;
+}
+
+bool seat_can_graphical(Seat *s) {
         assert(s);
 
-        return s->manager->vtconsole == s;
+        return seat_has_master_device(s);
 }
 
 int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
@@ -427,7 +479,7 @@ int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
 
                 if (!ih) {
                         if (!idle_hint) {
-                                if (k.monotonic < ts.monotonic)
+                                if (k.monotonic > ts.monotonic)
                                         ts = k;
                         } else {
                                 idle_hint = false;
@@ -452,10 +504,10 @@ int seat_check_gc(Seat *s, bool drop_not_started) {
         if (drop_not_started && !s->started)
                 return 0;
 
-        if (seat_is_vtconsole(s))
+        if (seat_is_seat0(s))
                 return 1;
 
-        return !!s->devices;
+        return seat_has_master_device(s);
 }
 
 void seat_add_to_gc_queue(Seat *s) {