chiark / gitweb /
load-fragment: speed up parsing by using a perfect hash table with configuration...
[elogind.git] / src / logind.c
index 7e9b706d139ace66abbc395dba241dcb7927286a..ca48aa137fa4b9b75f03e1f7610c269f1007c0c6 100644 (file)
 #include "logind.h"
 #include "dbus-common.h"
 #include "dbus-loop.h"
-
-enum {
-        FD_UDEV,
-        FD_CONSOLE,
-        FD_BUS
-};
+#include "strv.h"
+#include "conf-parser.h"
 
 Manager *manager_new(void) {
         Manager *m;
@@ -48,7 +44,8 @@ Manager *manager_new(void) {
 
         m->console_active_fd = -1;
         m->bus_fd = -1;
-        m->udev_fd = -1;
+        m->udev_seat_fd = -1;
+        m->udev_vcsa_fd = -1;
         m->epoll_fd = -1;
         m->n_autovts = 6;
 
@@ -56,8 +53,17 @@ Manager *manager_new(void) {
         m->seats = hashmap_new(string_hash_func, string_compare_func);
         m->sessions = hashmap_new(string_hash_func, string_compare_func);
         m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
+        m->cgroups = hashmap_new(string_hash_func, string_compare_func);
+        m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
+
+        if (!m->devices || !m->seats || !m->sessions || !m->users || !m->cgroups || !m->fifo_fds) {
+                manager_free(m);
+                return NULL;
+        }
 
-        if (!m->devices || !m->seats || !m->sessions || !m->users) {
+        m->reset_controllers = strv_new("cpu", NULL);
+        m->kill_exclude_users = strv_new("root", NULL);
+        if (!m->reset_controllers || !m->kill_exclude_users) {
                 manager_free(m);
                 return NULL;
         }
@@ -100,12 +106,17 @@ void manager_free(Manager *m) {
         hashmap_free(m->users);
         hashmap_free(m->devices);
         hashmap_free(m->seats);
+        hashmap_free(m->cgroups);
+        hashmap_free(m->fifo_fds);
 
         if (m->console_active_fd >= 0)
                 close_nointr_nofail(m->console_active_fd);
 
-        if (m->udev_monitor)
-                udev_monitor_unref(m->udev_monitor);
+        if (m->udev_seat_monitor)
+                udev_monitor_unref(m->udev_seat_monitor);
+
+        if (m->udev_vcsa_monitor)
+                udev_monitor_unref(m->udev_vcsa_monitor);
 
         if (m->udev)
                 udev_unref(m->udev);
@@ -122,6 +133,11 @@ void manager_free(Manager *m) {
         if (m->epoll_fd >= 0)
                 close_nointr_nofail(m->epoll_fd);
 
+        strv_free(m->controllers);
+        strv_free(m->reset_controllers);
+        strv_free(m->kill_only_users);
+        strv_free(m->kill_exclude_users);
+
         free(m->cgroup_path);
         free(m);
 }
@@ -200,7 +216,6 @@ int manager_add_session(Manager *m, User *u, const char *id, Session **_session)
 
 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
         User *u;
-        int r;
 
         assert(m);
         assert(name);
@@ -217,30 +232,25 @@ int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **
         if (!u)
                 return -ENOMEM;
 
-        r = user_start(u);
-        if (r < 0) {
-                user_stop(u);
-                user_free(u);
-        } else {
-                if (_user)
-                        *_user = u;
-        }
+        if (_user)
+                *_user = u;
 
-        return r;
+        return 0;
 }
 
 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
-        struct passwd *p;
+        uid_t uid;
+        gid_t gid;
+        int r;
 
         assert(m);
         assert(name);
 
-        errno = 0;
-        p = getpwnam(name);
-        if (!p)
-                return errno ? -errno : -ENOENT;
+        r = get_user_creds(&name, &uid, &gid, NULL);
+        if (r < 0)
+                return r;
 
-        return manager_add_user(m, p->pw_uid, p->pw_gid, name, _user);
+        return manager_add_user(m, uid, gid, name, _user);
 }
 
 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
@@ -256,34 +266,58 @@ int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
         return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
 }
 
-int manager_process_device(Manager *m, struct udev_device *d) {
-        const char *sn;
-        Seat *seat;
+int manager_process_seat_device(Manager *m, struct udev_device *d) {
         Device *device;
         int r;
 
         assert(m);
 
-        sn = udev_device_get_property_value(d, "SEAT");
-        if (!sn)
-                sn = "seat0";
+        if (streq_ptr(udev_device_get_action(d), "remove")) {
 
-        r = manager_add_device(m, udev_device_get_syspath(d), &device);
-        if (r < 0)
-                return r;
+                /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
+                device = hashmap_get(m->devices, udev_device_get_sysname(d));
+                if (!device)
+                        return 0;
 
-        r = manager_add_seat(m, sn, &seat);
-        if (r < 0)
-                return r;
+                seat_add_to_gc_queue(device->seat);
+                device_free(device);
+
+        } else {
+                const char *sn;
+                Seat *seat;
+
+                sn = udev_device_get_property_value(d, "ID_SEAT");
+                if (isempty(sn))
+                        sn = "seat0";
+
+                if (!seat_name_is_valid(sn)) {
+                        log_warning("Device with invalid seat name %s found, ignoring.", sn);
+                        return 0;
+                }
+
+                r = manager_add_device(m, udev_device_get_sysname(d), &device);
+                if (r < 0)
+                        return r;
+
+                r = manager_add_seat(m, sn, &seat);
+                if (r < 0) {
+                        if (!device->seat)
+                                device_free(device);
+
+                        return r;
+                }
+
+                device_attach(device, seat);
+                seat_start(seat);
+        }
 
-        device_attach(device, seat);
         return 0;
 }
 
 int manager_enumerate_devices(Manager *m) {
         struct udev_list_entry *item = NULL, *first = NULL;
         struct udev_enumerate *e;
-        int r = -ENOMEM;
+        int r;
 
         assert(m);
 
@@ -291,16 +325,21 @@ int manager_enumerate_devices(Manager *m) {
          * necessary */
 
         e = udev_enumerate_new(m->udev);
-        if (!e)
+        if (!e) {
+                r = -ENOMEM;
                 goto finish;
+        }
 
-        if (udev_enumerate_add_match_subsystem(e, "graphics") < 0)
+        r = udev_enumerate_add_match_subsystem(e, "graphics");
+        if (r < 0)
                 goto finish;
 
-        if (udev_enumerate_add_match_tag(e, "seat") < 0)
+        r = udev_enumerate_add_match_tag(e, "seat");
+        if (r < 0)
                 goto finish;
 
-        if (udev_enumerate_scan_devices(e) < 0)
+        r = udev_enumerate_scan_devices(e);
+        if (r < 0)
                 goto finish;
 
         first = udev_enumerate_get_list_entry(e);
@@ -309,10 +348,12 @@ int manager_enumerate_devices(Manager *m) {
                 int k;
 
                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
-                if (!d)
+                if (!d) {
+                        r = -ENOMEM;
                         goto finish;
+                }
 
-                k = manager_process_device(m, d);
+                k = manager_process_seat_device(m, d);
                 udev_device_unref(d);
 
                 if (k < 0)
@@ -385,24 +426,60 @@ static int manager_enumerate_users_from_cgroup(Manager *m) {
 
         while ((r = cg_read_subgroup(d, &name)) > 0) {
                 User *user;
+                int k;
+
+                k = manager_add_user_by_name(m, name, &user);
+                if (k < 0) {
+                        free(name);
+                        r = k;
+                        continue;
+                }
+
+                user_add_to_gc_queue(user);
+
+                if (!user->cgroup_path)
+                        if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
+                                r = -ENOMEM;
+                                free(name);
+                                break;
+                        }
 
-                r = manager_add_user_by_name(m, name, &user);
                 free(name);
+        }
 
-                if (r < 0)
-                        break;
+        closedir(d);
 
-                if (user->cgroup_path)
+        return r;
+}
+
+static int manager_enumerate_linger_users(Manager *m) {
+        DIR *d;
+        struct dirent *de;
+        int r = 0;
+
+        d = opendir("/var/lib/systemd/linger");
+        if (!d) {
+                if (errno == ENOENT)
+                        return 0;
+
+                log_error("Failed to open /var/lib/systemd/linger/: %m");
+                return -errno;
+        }
+
+        while ((de = readdir(d))) {
+                int k;
+
+                if (!dirent_is_file(de))
                         continue;
 
-                if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
-                        r = -ENOMEM;
-                        break;
+                k = manager_add_user_by_name(m, de->d_name, NULL);
+                if (k < 0) {
+                        log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
+                        r = k;
                 }
         }
 
-        if (d)
-                closedir(d);
+        closedir(d);
 
         return r;
 }
@@ -410,12 +487,19 @@ static int manager_enumerate_users_from_cgroup(Manager *m) {
 int manager_enumerate_users(Manager *m) {
         DIR *d;
         struct dirent *de;
-        int r;
+        int r, k;
 
         assert(m);
 
+        /* First, enumerate user cgroups */
         r = manager_enumerate_users_from_cgroup(m);
 
+        /* Second, add lingering users on top */
+        k = manager_enumerate_linger_users(m);
+        if (k < 0)
+                r = k;
+
+        /* Third, read in user data stored on disk */
         d = opendir("/run/systemd/users");
         if (!d) {
                 if (errno == ENOENT)
@@ -426,20 +510,19 @@ int manager_enumerate_users(Manager *m) {
         }
 
         while ((de = readdir(d))) {
-                unsigned long ul;
+                uid_t uid;
                 User *u;
-                int k;
 
                 if (!dirent_is_file(de))
                         continue;
 
-                k = safe_atolu(de->d_name, &ul);
+                k = parse_uid(de->d_name, &uid);
                 if (k < 0) {
                         log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
                         continue;
                 }
 
-                u = hashmap_get(m->users, ULONG_TO_PTR(ul));
+                u = hashmap_get(m->users, ULONG_TO_PTR(uid));
                 if (!u) {
                         unlinkat(dirfd(d), de->d_name, 0);
                         continue;
@@ -465,6 +548,9 @@ static int manager_enumerate_sessions_from_cgroup(Manager *m) {
                 char *name;
                 int k;
 
+                if (!u->cgroup_path)
+                        continue;
+
                 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
                 if (k < 0) {
                         if (k == -ENOENT)
@@ -478,19 +564,25 @@ static int manager_enumerate_sessions_from_cgroup(Manager *m) {
                 while ((k = cg_read_subgroup(d, &name)) > 0) {
                         Session *session;
 
-                        k = manager_add_session(m, u, name, &session);
-                        free(name);
-
-                        if (k < 0)
-                                break;
-
-                        if (session->cgroup_path)
+                        if (streq(name, "shared"))
                                 continue;
 
-                        if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
-                                k = -ENOMEM;
+                        k = manager_add_session(m, u, name, &session);
+                        if (k < 0) {
+                                free(name);
                                 break;
                         }
+
+                        session_add_to_gc_queue(session);
+
+                        if (!session->cgroup_path)
+                                if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
+                                        k = -ENOMEM;
+                                        free(name);
+                                        break;
+                                }
+
+                        free(name);
                 }
 
                 closedir(d);
@@ -509,8 +601,10 @@ int manager_enumerate_sessions(Manager *m) {
 
         assert(m);
 
+        /* First enumerate session cgroups */
         r = manager_enumerate_sessions_from_cgroup(m);
 
+        /* Second, read in session data stored on disk */
         d = opendir("/run/systemd/sessions");
         if (!d) {
                 if (errno == ENOENT)
@@ -543,88 +637,52 @@ int manager_enumerate_sessions(Manager *m) {
         return r;
 }
 
-int manager_start_linger_users(Manager *m) {
-        DIR *d;
-        struct dirent *de;
-        int r = 0;
-
-        d = opendir("/var/lib/systemd/linger");
-        if (!d) {
-                if (errno == ENOENT)
-                        return 0;
-
-                log_error("Failed to open /var/lib/systemd/linger/: %m");
-                return -errno;
-        }
-
-        while ((de = readdir(d))) {
-                int k;
+int manager_dispatch_seat_udev(Manager *m) {
+        struct udev_device *d;
+        int r;
 
-                if (!dirent_is_file(de))
-                        continue;
+        assert(m);
 
-                k = manager_add_user_by_name(m, de->d_name, NULL);
-                if (k < 0) {
-                        log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
-                        r = k;
-                }
-        }
+        d = udev_monitor_receive_device(m->udev_seat_monitor);
+        if (!d)
+                return -ENOMEM;
 
-        closedir(d);
+        r = manager_process_seat_device(m, d);
+        udev_device_unref(d);
 
         return r;
 }
 
-int manager_dispatch_udev(Manager *m) {
+
+int manager_dispatch_vcsa_udev(Manager *m) {
         struct udev_device *d;
-        int r;
+        int r = 0;
+        const char *name;
 
         assert(m);
 
-        d = udev_monitor_receive_device(m->udev_monitor);
+        d = udev_monitor_receive_device(m->udev_vcsa_monitor);
         if (!d)
                 return -ENOMEM;
 
-        r = manager_process_device(m, d);
+        name = udev_device_get_sysname(d);
+
+        /* Whenever a VCSA device is removed try to reallocate our
+         * VTs, to make sure our auto VTs never go away. */
+
+        if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
+                r = seat_preallocate_vts(m->vtconsole);
+
         udev_device_unref(d);
 
         return r;
 }
 
 int manager_dispatch_console(Manager *m) {
-        char t[64];
-        ssize_t k;
-        int r, vtnr;
-
         assert(m);
 
-        lseek(m->console_active_fd, SEEK_SET, 0);
-
-        k = read(m->console_active_fd, t, sizeof(t)-1);
-        if (k <= 0) {
-                log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
-                return k < 0 ? -errno : -EIO;
-        }
-
-        t[k] = 0;
-        if (!startswith(t, "tty")) {
-                log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
-                return -EIO;
-        }
-
-        r = safe_atoi(t+3, &vtnr);
-        if (r < 0) {
-                log_error("Failed to parse VT number %s", t+3);
-                return r;
-        }
-
-        if (vtnr <= 0) {
-                log_error("VT number invalid: %s", t+3);
-                return -EIO;
-        }
-
         if (m->vtconsole)
-                seat_active_vt_changed(m->vtconsole, vtnr);
+                seat_read_active_vt(m->vtconsole);
 
         return 0;
 }
@@ -635,7 +693,13 @@ static int vt_is_busy(int vtnr) {
 
         assert(vtnr >= 1);
 
-        fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+        /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
+         * we'd open the latter we'd open the foreground tty which
+         * hence would be unconditionally busy. By opening /dev/tty1
+         * we avoid this. Since tty1 is special and needs to be an
+         * explicitly loaded getty or DM this is safe. */
+
+        fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
         if (fd < 0)
                 return -errno;
 
@@ -651,39 +715,113 @@ static int vt_is_busy(int vtnr) {
 
 int manager_spawn_autovt(Manager *m, int vtnr) {
         int r;
+        DBusMessage *message = NULL, *reply = NULL;
+        char *name = NULL;
+        const char *mode = "fail";
+        DBusError error;
 
         assert(m);
+        assert(vtnr >= 1);
+
+        dbus_error_init(&error);
+
+        if ((unsigned) vtnr > m->n_autovts)
+                return 0;
 
         r = vt_is_busy(vtnr);
-        if (r != 0)
+        if (r < 0)
                 return r;
+        else if (r > 0)
+                return -EBUSY;
 
-        /* ... */
+        message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
+        if (!message) {
+                log_error("Could not allocate message.");
+                r = -ENOMEM;
+                goto finish;
+        }
 
-        return 0;
+        if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
+                log_error("Could not allocate service name.");
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        if (!dbus_message_append_args(message,
+                                      DBUS_TYPE_STRING, &name,
+                                      DBUS_TYPE_STRING, &mode,
+                                      DBUS_TYPE_INVALID)) {
+                log_error("Could not attach target and flag information to message.");
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
+        if (!reply) {
+                log_error("Failed to start unit: %s", bus_error_message(&error));
+                goto finish;
+        }
+
+        r = 0;
+
+finish:
+        free(name);
+
+        if (message)
+                dbus_message_unref(message);
+
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return r;
 }
 
-static DBusHandlerResult login_message_handler(
-                DBusConnection *connection,
-                DBusMessage *message,
-                void *userdata) {
+void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
+        Session *s;
+        char *p;
 
-        return DBUS_HANDLER_RESULT_HANDLED;
+        assert(m);
+        assert(cgroup);
+
+        p = strdup(cgroup);
+        if (!p) {
+                log_error("Out of memory.");
+                return;
+        }
+
+        for (;;) {
+                char *e;
+
+                if (isempty(p) || streq(p, "/"))
+                        break;
+
+                s = hashmap_get(m->cgroups, p);
+                if (s)
+                        session_add_to_gc_queue(s);
+
+                assert_se(e = strrchr(p, '/'));
+                *e = 0;
+        }
+
+        free(p);
 }
 
-static DBusHandlerResult login_message_filter(
-                DBusConnection *connection,
-                DBusMessage *message,
-                void *userdata) {
+static void manager_pipe_notify_eof(Manager *m, int fd) {
+        Session *s;
+
+        assert_se(m);
+        assert_se(fd >= 0);
+
+        assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
+        assert(s->fifo_fd == fd);
+        session_remove_fifo(s);
 
-        return DBUS_HANDLER_RESULT_HANDLED;
+        session_stop(s);
 }
 
 static int manager_connect_bus(Manager *m) {
-        const DBusObjectPathVTable login_vtable = {
-                .message_function = login_message_handler
-        };
-
         DBusError error;
         int r;
         struct epoll_event ev;
@@ -696,18 +834,16 @@ static int manager_connect_bus(Manager *m) {
 
         m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
         if (!m->bus) {
-                log_error("Failed to get system D-Bus connection: %s", error.message);
+                log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
                 r = -ECONNREFUSED;
                 goto fail;
         }
 
-        if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &login_vtable, NULL)) {
-                log_error("Not enough memory");
-                r = -ENOMEM;
-                goto fail;
-        }
-
-        if (!dbus_connection_add_filter(m->bus, login_message_filter, m, NULL)) {
+        if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
+            !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
+            !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
+            !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
+            !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
                 log_error("Not enough memory");
                 r = -ENOMEM;
                 goto fail;
@@ -721,13 +857,20 @@ static int manager_connect_bus(Manager *m) {
                            &error);
 
         if (dbus_error_is_set(&error)) {
-                log_error("Failed to register match: %s", error.message);
+                log_error("Failed to register match: %s", bus_error_message(&error));
                 r = -EIO;
                 goto fail;
         }
 
-        if (dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) {
-                log_error("Failed to register name on bus: %s", error.message);
+        r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
+        if (dbus_error_is_set(&error)) {
+                log_error("Failed to register name on bus: %s", bus_error_message(&error));
+                r = -EIO;
+                goto fail;
+        }
+
+        if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)  {
+                log_error("Failed to acquire name.");
                 r = -EEXIST;
                 goto fail;
         }
@@ -766,7 +909,7 @@ static int manager_connect_console(Manager *m) {
         }
 
         zero(ev);
-        ev.events = EPOLLIN;
+        ev.events = 0;
         ev.data.u32 = FD_CONSOLE;
 
         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
@@ -777,36 +920,145 @@ static int manager_connect_console(Manager *m) {
 
 static int manager_connect_udev(Manager *m) {
         struct epoll_event ev;
+        int r;
 
         assert(m);
-        assert(!m->udev_monitor);
+        assert(!m->udev_seat_monitor);
+        assert(!m->udev_vcsa_monitor);
 
-        m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
-        if (!m->udev_monitor)
+        m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
+        if (!m->udev_seat_monitor)
                 return -ENOMEM;
 
-        udev_monitor_filter_add_match_tag(m->udev_monitor, "seat");
+        r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
+        if (r < 0)
+                return r;
+
+        r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
+        if (r < 0)
+                return r;
 
-        if (udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "graphics", NULL) < 0)
-                return -ENOMEM;
+        r = udev_monitor_enable_receiving(m->udev_seat_monitor);
+        if (r < 0)
+                return r;
+
+        m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
+
+        zero(ev);
+        ev.events = EPOLLIN;
+        ev.data.u32 = FD_SEAT_UDEV;
+
+        if (m->n_autovts <= 0)
+                return 0;
+
+        if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
+                return -errno;
 
-        if (udev_monitor_enable_receiving(m->udev_monitor) < 0)
+        m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
+        if (!m->udev_vcsa_monitor)
                 return -ENOMEM;
 
-        m->udev_fd = udev_monitor_get_fd(m->udev_monitor);
+        r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
+        if (r < 0)
+                return r;
+
+        r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
+        if (r < 0)
+                return r;
+
+        m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
 
         zero(ev);
         ev.events = EPOLLIN;
-        ev.data.u32 = FD_UDEV;
+        ev.data.u32 = FD_VCSA_UDEV;
 
-        if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_fd, &ev) < 0)
+        if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
                 return -errno;
 
         return 0;
 }
 
+void manager_gc(Manager *m, bool drop_not_started) {
+        Seat *seat;
+        Session *session;
+        User *user;
+
+        assert(m);
+
+        while ((seat = m->seat_gc_queue)) {
+                LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
+                seat->in_gc_queue = false;
+
+                if (seat_check_gc(seat, drop_not_started) == 0) {
+                        seat_stop(seat);
+                        seat_free(seat);
+                }
+        }
+
+        while ((session = m->session_gc_queue)) {
+                LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
+                session->in_gc_queue = false;
+
+                if (session_check_gc(session, drop_not_started) == 0) {
+                        session_stop(session);
+                        session_free(session);
+                }
+        }
+
+        while ((user = m->user_gc_queue)) {
+                LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
+                user->in_gc_queue = false;
+
+                if (user_check_gc(user, drop_not_started) == 0) {
+                        user_stop(user);
+                        user_free(user);
+                }
+        }
+}
+
+int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
+        Session *s;
+        bool idle_hint = true;
+        dual_timestamp ts = { 0, 0 };
+        Iterator i;
+
+        assert(m);
+
+        HASHMAP_FOREACH(s, m->sessions, i) {
+                dual_timestamp k;
+                int ih;
+
+                ih = session_get_idle_hint(s, &k);
+                if (ih < 0)
+                        return ih;
+
+                if (!ih) {
+                        if (!idle_hint) {
+                                if (k.monotonic < ts.monotonic)
+                                        ts = k;
+                        } else {
+                                idle_hint = false;
+                                ts = k;
+                        }
+                } else if (idle_hint) {
+
+                        if (k.monotonic > ts.monotonic)
+                                ts = k;
+                }
+        }
+
+        if (t)
+                *t = ts;
+
+        return idle_hint;
+}
+
 int manager_startup(Manager *m) {
         int r;
+        Seat *seat;
+        Session *session;
+        User *user;
+        Iterator i;
 
         assert(m);
         assert(m->epoll_fd <= 0);
@@ -830,14 +1082,29 @@ int manager_startup(Manager *m) {
         if (r < 0)
                 return r;
 
+        /* Instantiate magic seat 0 */
+        r = manager_add_seat(m, "seat0", &m->vtconsole);
+        if (r < 0)
+                return r;
+
         /* Deserialize state */
         manager_enumerate_devices(m);
         manager_enumerate_seats(m);
         manager_enumerate_users(m);
         manager_enumerate_sessions(m);
 
-        /* Spawn lingering users */
-        manager_start_linger_users(m);
+        /* Remove stale objects before we start them */
+        manager_gc(m, false);
+
+        /* And start everything */
+        HASHMAP_FOREACH(seat, m->seats, i)
+                seat_start(seat);
+
+        HASHMAP_FOREACH(user, m->users, i)
+                user_start(user);
+
+        HASHMAP_FOREACH(session, m->sessions, i)
+                session_start(session);
 
         return 0;
 }
@@ -849,19 +1116,30 @@ int manager_run(Manager *m) {
                 struct epoll_event event;
                 int n;
 
+                manager_gc(m, true);
+
                 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
                         continue;
 
+                manager_gc(m, true);
+
                 n = epoll_wait(m->epoll_fd, &event, 1, -1);
                 if (n < 0) {
+                        if (errno == EINTR || errno == EAGAIN)
+                                continue;
+
                         log_error("epoll() failed: %m");
                         return -errno;
                 }
 
                 switch (event.data.u32) {
 
-                case FD_UDEV:
-                        manager_dispatch_udev(m);
+                case FD_SEAT_UDEV:
+                        manager_dispatch_seat_udev(m);
+                        break;
+
+                case FD_VCSA_UDEV:
+                        manager_dispatch_vcsa_udev(m);
                         break;
 
                 case FD_CONSOLE:
@@ -871,12 +1149,42 @@ int manager_run(Manager *m) {
                 case FD_BUS:
                         bus_loop_dispatch(m->bus_fd);
                         break;
+
+                default:
+                        if (event.data.u32 >= FD_FIFO_BASE)
+                                manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
                 }
         }
 
         return 0;
 }
 
+static int manager_parse_config_file(Manager *m) {
+        FILE *f;
+        const char *fn;
+        int r;
+
+        assert(m);
+
+        fn = "/etc/systemd/systemd-logind.conf";
+        f = fopen(fn, "re");
+        if (!f) {
+                if (errno == ENOENT)
+                        return 0;
+
+                log_warning("Failed to open configuration file %s: %m", fn);
+                return -errno;
+        }
+
+        r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
+        if (r < 0)
+                log_warning("Failed to parse configuration file: %s", strerror(-r));
+
+        fclose(f);
+
+        return r;
+}
+
 int main(int argc, char *argv[]) {
         Manager *m = NULL;
         int r;
@@ -900,6 +1208,8 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
+        manager_parse_config_file(m);
+
         r = manager_startup(m);
         if (r < 0) {
                 log_error("Failed to fully start up daemon: %s", strerror(-r));