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/>.
28 #include <sys/epoll.h>
29 #include <sys/ioctl.h>
32 #include <systemd/sd-daemon.h>
35 #include "dbus-common.h"
36 #include "dbus-loop.h"
38 #include "conf-parser.h"
40 Manager *manager_new(void) {
47 m->console_active_fd = -1;
54 m->devices = hashmap_new(string_hash_func, string_compare_func);
55 m->seats = hashmap_new(string_hash_func, string_compare_func);
56 m->sessions = hashmap_new(string_hash_func, string_compare_func);
57 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
58 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
59 m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
61 if (!m->devices || !m->seats || !m->sessions || !m->users || !m->cgroups || !m->fifo_fds) {
66 m->reset_controllers = strv_new("cpu", NULL);
67 m->kill_exclude_users = strv_new("root", NULL);
68 if (!m->reset_controllers || !m->kill_exclude_users) {
79 if (cg_get_user_path(&m->cgroup_path) < 0) {
87 void manager_free(Manager *m) {
95 while ((session = hashmap_first(m->sessions)))
96 session_free(session);
98 while ((u = hashmap_first(m->users)))
101 while ((d = hashmap_first(m->devices)))
104 while ((s = hashmap_first(m->seats)))
107 hashmap_free(m->sessions);
108 hashmap_free(m->users);
109 hashmap_free(m->devices);
110 hashmap_free(m->seats);
111 hashmap_free(m->cgroups);
112 hashmap_free(m->fifo_fds);
114 if (m->console_active_fd >= 0)
115 close_nointr_nofail(m->console_active_fd);
117 if (m->udev_seat_monitor)
118 udev_monitor_unref(m->udev_seat_monitor);
120 if (m->udev_vcsa_monitor)
121 udev_monitor_unref(m->udev_vcsa_monitor);
127 dbus_connection_flush(m->bus);
128 dbus_connection_close(m->bus);
129 dbus_connection_unref(m->bus);
133 close_nointr_nofail(m->bus_fd);
135 if (m->epoll_fd >= 0)
136 close_nointr_nofail(m->epoll_fd);
138 strv_free(m->controllers);
139 strv_free(m->reset_controllers);
140 strv_free(m->kill_only_users);
141 strv_free(m->kill_exclude_users);
143 free(m->cgroup_path);
147 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
153 d = hashmap_get(m->devices, sysfs);
161 d = device_new(m, sysfs);
171 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
177 s = hashmap_get(m->seats, id);
195 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
201 s = hashmap_get(m->sessions, id);
209 s = session_new(m, u, id);
219 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
225 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
233 u = user_new(m, uid, gid, name);
243 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
251 r = get_user_creds(&name, &uid, &gid, NULL);
255 return manager_add_user(m, uid, gid, name, _user);
258 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
266 return errno ? -errno : -ENOENT;
268 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
271 int manager_process_seat_device(Manager *m, struct udev_device *d) {
277 if (streq_ptr(udev_device_get_action(d), "remove")) {
279 device = hashmap_get(m->devices, udev_device_get_syspath(d));
283 seat_add_to_gc_queue(device->seat);
290 sn = udev_device_get_property_value(d, "ID_SEAT");
294 if (!seat_name_is_valid(sn)) {
295 log_warning("Device with invalid seat name %s found, ignoring.", sn);
299 r = manager_add_device(m, udev_device_get_syspath(d), &device);
303 r = manager_add_seat(m, sn, &seat);
311 device_attach(device, seat);
318 int manager_enumerate_devices(Manager *m) {
319 struct udev_list_entry *item = NULL, *first = NULL;
320 struct udev_enumerate *e;
325 /* Loads devices from udev and creates seats for them as
328 e = udev_enumerate_new(m->udev);
334 r = udev_enumerate_add_match_subsystem(e, "graphics");
338 r = udev_enumerate_add_match_tag(e, "seat");
342 r = udev_enumerate_scan_devices(e);
346 first = udev_enumerate_get_list_entry(e);
347 udev_list_entry_foreach(item, first) {
348 struct udev_device *d;
351 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
357 k = manager_process_seat_device(m, d);
358 udev_device_unref(d);
366 udev_enumerate_unref(e);
371 int manager_enumerate_seats(Manager *m) {
378 /* This loads data about seats stored on disk, but does not
379 * actually create any seats. Removes data of seats that no
382 d = opendir("/run/systemd/seats");
387 log_error("Failed to open /run/systemd/seats: %m");
391 while ((de = readdir(d))) {
395 if (!dirent_is_file(de))
398 s = hashmap_get(m->seats, de->d_name);
400 unlinkat(dirfd(d), de->d_name, 0);
414 static int manager_enumerate_users_from_cgroup(Manager *m) {
420 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
425 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
429 while ((k = cg_read_subgroup(d, &name)) > 0) {
432 k = manager_add_user_by_name(m, name, &user);
439 user_add_to_gc_queue(user);
441 if (!user->cgroup_path)
442 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
459 static int manager_enumerate_linger_users(Manager *m) {
464 d = opendir("/var/lib/systemd/linger");
469 log_error("Failed to open /var/lib/systemd/linger/: %m");
473 while ((de = readdir(d))) {
476 if (!dirent_is_file(de))
479 k = manager_add_user_by_name(m, de->d_name, NULL);
481 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
491 int manager_enumerate_users(Manager *m) {
498 /* First, enumerate user cgroups */
499 r = manager_enumerate_users_from_cgroup(m);
501 /* Second, add lingering users on top */
502 k = manager_enumerate_linger_users(m);
506 /* Third, read in user data stored on disk */
507 d = opendir("/run/systemd/users");
512 log_error("Failed to open /run/systemd/users: %m");
516 while ((de = readdir(d))) {
520 if (!dirent_is_file(de))
523 k = parse_uid(de->d_name, &uid);
525 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
529 u = hashmap_get(m->users, ULONG_TO_PTR(uid));
531 unlinkat(dirfd(d), de->d_name, 0);
545 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
550 HASHMAP_FOREACH(u, m->users, i) {
558 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
563 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
568 while ((k = cg_read_subgroup(d, &name)) > 0) {
571 if (streq(name, "shared"))
574 k = manager_add_session(m, u, name, &session);
580 session_add_to_gc_queue(session);
582 if (!session->cgroup_path)
583 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
601 int manager_enumerate_sessions(Manager *m) {
608 /* First enumerate session cgroups */
609 r = manager_enumerate_sessions_from_cgroup(m);
611 /* Second, read in session data stored on disk */
612 d = opendir("/run/systemd/sessions");
617 log_error("Failed to open /run/systemd/sessions: %m");
621 while ((de = readdir(d))) {
625 if (!dirent_is_file(de))
628 s = hashmap_get(m->sessions, de->d_name);
630 unlinkat(dirfd(d), de->d_name, 0);
644 int manager_dispatch_seat_udev(Manager *m) {
645 struct udev_device *d;
650 d = udev_monitor_receive_device(m->udev_seat_monitor);
654 r = manager_process_seat_device(m, d);
655 udev_device_unref(d);
660 int manager_dispatch_vcsa_udev(Manager *m) {
661 struct udev_device *d;
667 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
671 name = udev_device_get_sysname(d);
673 /* Whenever a VCSA device is removed try to reallocate our
674 * VTs, to make sure our auto VTs never go away. */
676 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
677 r = seat_preallocate_vts(m->vtconsole);
679 udev_device_unref(d);
684 int manager_dispatch_console(Manager *m) {
688 seat_read_active_vt(m->vtconsole);
693 static int vt_is_busy(int vtnr) {
694 struct vt_stat vt_stat;
699 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
700 * we'd open the latter we'd open the foreground tty which
701 * hence would be unconditionally busy. By opening /dev/tty1
702 * we avoid this. Since tty1 is special and needs to be an
703 * explicitly loaded getty or DM this is safe. */
705 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
709 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
712 r = !!(vt_stat.v_state & (1 << vtnr));
714 close_nointr_nofail(fd);
719 int manager_spawn_autovt(Manager *m, int vtnr) {
721 DBusMessage *message = NULL, *reply = NULL;
723 const char *mode = "fail";
729 dbus_error_init(&error);
731 if ((unsigned) vtnr > m->n_autovts)
734 r = vt_is_busy(vtnr);
740 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
742 log_error("Could not allocate message.");
747 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
748 log_error("Could not allocate service name.");
753 if (!dbus_message_append_args(message,
754 DBUS_TYPE_STRING, &name,
755 DBUS_TYPE_STRING, &mode,
756 DBUS_TYPE_INVALID)) {
757 log_error("Could not attach target and flag information to message.");
762 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
764 log_error("Failed to start unit: %s", bus_error_message(&error));
774 dbus_message_unref(message);
777 dbus_message_unref(reply);
779 dbus_error_free(&error);
784 int manager_get_session_by_cgroup(Manager *m, const char *cgroup, Session **session) {
792 s = hashmap_get(m->cgroups, cgroup);
800 log_error("Out of memory.");
816 s = hashmap_get(m->cgroups, p);
825 int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session) {
833 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &p);
837 r = manager_get_session_by_cgroup(m, p, session);
843 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
847 r = manager_get_session_by_cgroup(m, cgroup, &s);
851 session_add_to_gc_queue(s);
854 static void manager_pipe_notify_eof(Manager *m, int fd) {
860 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
861 assert(s->fifo_fd == fd);
862 session_remove_fifo(s);
867 static int manager_connect_bus(Manager *m) {
870 struct epoll_event ev;
874 assert(m->bus_fd < 0);
876 dbus_error_init(&error);
878 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
880 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
885 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
886 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
887 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
888 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
889 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
890 log_error("Not enough memory");
895 dbus_bus_add_match(m->bus,
897 "interface='org.freedesktop.systemd1.Agent',"
899 "path='/org/freedesktop/systemd1/agent'",
902 if (dbus_error_is_set(&error)) {
903 log_error("Failed to register match: %s", bus_error_message(&error));
908 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
909 if (dbus_error_is_set(&error)) {
910 log_error("Failed to register name on bus: %s", bus_error_message(&error));
915 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
916 log_error("Failed to acquire name.");
921 m->bus_fd = bus_loop_open(m->bus);
929 ev.data.u32 = FD_BUS;
931 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
937 dbus_error_free(&error);
942 static int manager_connect_console(Manager *m) {
943 struct epoll_event ev;
946 assert(m->console_active_fd < 0);
948 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
949 if (m->console_active_fd < 0) {
951 /* On certain architectures (S390 and Xen), /dev/tty0
952 does not exist, so don't fail if we can't open it.*/
956 log_error("Failed to open /sys/class/tty/tty0/active: %m");
962 ev.data.u32 = FD_CONSOLE;
964 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
970 static int manager_connect_udev(Manager *m) {
971 struct epoll_event ev;
975 assert(!m->udev_seat_monitor);
976 assert(!m->udev_vcsa_monitor);
978 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
979 if (!m->udev_seat_monitor)
982 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
986 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
990 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
994 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
998 ev.data.u32 = FD_SEAT_UDEV;
1000 /* Don't bother watching VCSA devices, if nobody cares */
1001 if (m->n_autovts <= 0 || m->console_active_fd < 0)
1004 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
1007 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
1008 if (!m->udev_vcsa_monitor)
1011 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
1015 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
1019 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
1022 ev.events = EPOLLIN;
1023 ev.data.u32 = FD_VCSA_UDEV;
1025 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
1031 void manager_gc(Manager *m, bool drop_not_started) {
1038 while ((seat = m->seat_gc_queue)) {
1039 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
1040 seat->in_gc_queue = false;
1042 if (seat_check_gc(seat, drop_not_started) == 0) {
1048 while ((session = m->session_gc_queue)) {
1049 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
1050 session->in_gc_queue = false;
1052 if (session_check_gc(session, drop_not_started) == 0) {
1053 session_stop(session);
1054 session_free(session);
1058 while ((user = m->user_gc_queue)) {
1059 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1060 user->in_gc_queue = false;
1062 if (user_check_gc(user, drop_not_started) == 0) {
1069 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1071 bool idle_hint = true;
1072 dual_timestamp ts = { 0, 0 };
1077 HASHMAP_FOREACH(s, m->sessions, i) {
1081 ih = session_get_idle_hint(s, &k);
1087 if (k.monotonic < ts.monotonic)
1093 } else if (idle_hint) {
1095 if (k.monotonic > ts.monotonic)
1106 int manager_startup(Manager *m) {
1114 assert(m->epoll_fd <= 0);
1116 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1117 if (m->epoll_fd < 0)
1120 /* Connect to console */
1121 r = manager_connect_console(m);
1125 /* Connect to udev */
1126 r = manager_connect_udev(m);
1130 /* Connect to the bus */
1131 r = manager_connect_bus(m);
1135 /* Instantiate magic seat 0 */
1136 r = manager_add_seat(m, "seat0", &m->vtconsole);
1140 /* Deserialize state */
1141 manager_enumerate_devices(m);
1142 manager_enumerate_seats(m);
1143 manager_enumerate_users(m);
1144 manager_enumerate_sessions(m);
1146 /* Remove stale objects before we start them */
1147 manager_gc(m, false);
1149 /* And start everything */
1150 HASHMAP_FOREACH(seat, m->seats, i)
1153 HASHMAP_FOREACH(user, m->users, i)
1156 HASHMAP_FOREACH(session, m->sessions, i)
1157 session_start(session);
1162 int manager_run(Manager *m) {
1166 struct epoll_event event;
1169 manager_gc(m, true);
1171 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1174 manager_gc(m, true);
1176 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1178 if (errno == EINTR || errno == EAGAIN)
1181 log_error("epoll() failed: %m");
1185 switch (event.data.u32) {
1188 manager_dispatch_seat_udev(m);
1192 manager_dispatch_vcsa_udev(m);
1196 manager_dispatch_console(m);
1200 bus_loop_dispatch(m->bus_fd);
1204 if (event.data.u32 >= FD_FIFO_BASE)
1205 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1212 static int manager_parse_config_file(Manager *m) {
1219 fn = "/etc/systemd/logind.conf";
1220 f = fopen(fn, "re");
1222 if (errno == ENOENT)
1225 log_warning("Failed to open configuration file %s: %m", fn);
1229 r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
1231 log_warning("Failed to parse configuration file: %s", strerror(-r));
1238 int main(int argc, char *argv[]) {
1242 log_set_target(LOG_TARGET_AUTO);
1243 log_set_facility(LOG_AUTH);
1244 log_parse_environment();
1250 log_error("This program takes no arguments.");
1257 log_error("Out of memory");
1262 manager_parse_config_file(m);
1264 r = manager_startup(m);
1266 log_error("Failed to fully start up daemon: %s", strerror(-r));
1270 log_debug("systemd-logind running as pid %lu", (unsigned long) getpid());
1274 "STATUS=Processing requests...");
1278 log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid());
1282 "STATUS=Shutting down...");
1287 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;