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>
33 #include "sd-daemon.h"
34 #include "dbus-common.h"
35 #include "dbus-loop.h"
37 #include "conf-parser.h"
39 Manager *manager_new(void) {
46 m->console_active_fd = -1;
53 m->devices = hashmap_new(string_hash_func, string_compare_func);
54 m->seats = hashmap_new(string_hash_func, string_compare_func);
55 m->sessions = hashmap_new(string_hash_func, string_compare_func);
56 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
57 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
58 m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
60 if (!m->devices || !m->seats || !m->sessions || !m->users || !m->cgroups || !m->fifo_fds) {
65 m->reset_controllers = strv_new("cpu", NULL);
66 m->kill_exclude_users = strv_new("root", NULL);
67 if (!m->reset_controllers || !m->kill_exclude_users) {
78 if (cg_get_user_path(&m->cgroup_path) < 0) {
86 void manager_free(Manager *m) {
94 while ((session = hashmap_first(m->sessions)))
95 session_free(session);
97 while ((u = hashmap_first(m->users)))
100 while ((d = hashmap_first(m->devices)))
103 while ((s = hashmap_first(m->seats)))
106 hashmap_free(m->sessions);
107 hashmap_free(m->users);
108 hashmap_free(m->devices);
109 hashmap_free(m->seats);
110 hashmap_free(m->cgroups);
111 hashmap_free(m->fifo_fds);
113 if (m->console_active_fd >= 0)
114 close_nointr_nofail(m->console_active_fd);
116 if (m->udev_seat_monitor)
117 udev_monitor_unref(m->udev_seat_monitor);
119 if (m->udev_vcsa_monitor)
120 udev_monitor_unref(m->udev_vcsa_monitor);
126 dbus_connection_flush(m->bus);
127 dbus_connection_close(m->bus);
128 dbus_connection_unref(m->bus);
132 close_nointr_nofail(m->bus_fd);
134 if (m->epoll_fd >= 0)
135 close_nointr_nofail(m->epoll_fd);
137 strv_free(m->controllers);
138 strv_free(m->reset_controllers);
139 strv_free(m->kill_only_users);
140 strv_free(m->kill_exclude_users);
142 free(m->cgroup_path);
146 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
152 d = hashmap_get(m->devices, sysfs);
160 d = device_new(m, sysfs);
170 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
176 s = hashmap_get(m->seats, id);
194 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
200 s = hashmap_get(m->sessions, id);
208 s = session_new(m, u, id);
218 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
224 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
232 u = user_new(m, uid, gid, name);
242 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
250 r = get_user_creds(&name, &uid, &gid, NULL);
254 return manager_add_user(m, uid, gid, name, _user);
257 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
265 return errno ? -errno : -ENOENT;
267 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
270 int manager_process_seat_device(Manager *m, struct udev_device *d) {
276 if (streq_ptr(udev_device_get_action(d), "remove")) {
278 device = hashmap_get(m->devices, udev_device_get_syspath(d));
282 seat_add_to_gc_queue(device->seat);
289 sn = udev_device_get_property_value(d, "ID_SEAT");
293 if (!seat_name_is_valid(sn)) {
294 log_warning("Device with invalid seat name %s found, ignoring.", sn);
298 r = manager_add_device(m, udev_device_get_syspath(d), &device);
302 r = manager_add_seat(m, sn, &seat);
310 device_attach(device, seat);
317 int manager_enumerate_devices(Manager *m) {
318 struct udev_list_entry *item = NULL, *first = NULL;
319 struct udev_enumerate *e;
324 /* Loads devices from udev and creates seats for them as
327 e = udev_enumerate_new(m->udev);
333 r = udev_enumerate_add_match_subsystem(e, "graphics");
337 r = udev_enumerate_add_match_tag(e, "seat");
341 r = udev_enumerate_scan_devices(e);
345 first = udev_enumerate_get_list_entry(e);
346 udev_list_entry_foreach(item, first) {
347 struct udev_device *d;
350 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
356 k = manager_process_seat_device(m, d);
357 udev_device_unref(d);
365 udev_enumerate_unref(e);
370 int manager_enumerate_seats(Manager *m) {
377 /* This loads data about seats stored on disk, but does not
378 * actually create any seats. Removes data of seats that no
381 d = opendir("/run/systemd/seats");
386 log_error("Failed to open /run/systemd/seats: %m");
390 while ((de = readdir(d))) {
394 if (!dirent_is_file(de))
397 s = hashmap_get(m->seats, de->d_name);
399 unlinkat(dirfd(d), de->d_name, 0);
413 static int manager_enumerate_users_from_cgroup(Manager *m) {
419 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
424 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
428 while ((k = cg_read_subgroup(d, &name)) > 0) {
431 k = manager_add_user_by_name(m, name, &user);
438 user_add_to_gc_queue(user);
440 if (!user->cgroup_path)
441 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
458 static int manager_enumerate_linger_users(Manager *m) {
463 d = opendir("/var/lib/systemd/linger");
468 log_error("Failed to open /var/lib/systemd/linger/: %m");
472 while ((de = readdir(d))) {
475 if (!dirent_is_file(de))
478 k = manager_add_user_by_name(m, de->d_name, NULL);
480 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
490 int manager_enumerate_users(Manager *m) {
497 /* First, enumerate user cgroups */
498 r = manager_enumerate_users_from_cgroup(m);
500 /* Second, add lingering users on top */
501 k = manager_enumerate_linger_users(m);
505 /* Third, read in user data stored on disk */
506 d = opendir("/run/systemd/users");
511 log_error("Failed to open /run/systemd/users: %m");
515 while ((de = readdir(d))) {
519 if (!dirent_is_file(de))
522 k = parse_uid(de->d_name, &uid);
524 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
528 u = hashmap_get(m->users, ULONG_TO_PTR(uid));
530 unlinkat(dirfd(d), de->d_name, 0);
544 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
549 HASHMAP_FOREACH(u, m->users, i) {
557 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
562 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
567 while ((k = cg_read_subgroup(d, &name)) > 0) {
570 if (streq(name, "shared"))
573 k = manager_add_session(m, u, name, &session);
579 session_add_to_gc_queue(session);
581 if (!session->cgroup_path)
582 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
600 int manager_enumerate_sessions(Manager *m) {
607 /* First enumerate session cgroups */
608 r = manager_enumerate_sessions_from_cgroup(m);
610 /* Second, read in session data stored on disk */
611 d = opendir("/run/systemd/sessions");
616 log_error("Failed to open /run/systemd/sessions: %m");
620 while ((de = readdir(d))) {
624 if (!dirent_is_file(de))
627 s = hashmap_get(m->sessions, de->d_name);
629 unlinkat(dirfd(d), de->d_name, 0);
643 int manager_dispatch_seat_udev(Manager *m) {
644 struct udev_device *d;
649 d = udev_monitor_receive_device(m->udev_seat_monitor);
653 r = manager_process_seat_device(m, d);
654 udev_device_unref(d);
659 int manager_dispatch_vcsa_udev(Manager *m) {
660 struct udev_device *d;
666 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
670 name = udev_device_get_sysname(d);
672 /* Whenever a VCSA device is removed try to reallocate our
673 * VTs, to make sure our auto VTs never go away. */
675 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
676 r = seat_preallocate_vts(m->vtconsole);
678 udev_device_unref(d);
683 int manager_dispatch_console(Manager *m) {
687 seat_read_active_vt(m->vtconsole);
692 static int vt_is_busy(int vtnr) {
693 struct vt_stat vt_stat;
698 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
699 * we'd open the latter we'd open the foreground tty which
700 * hence would be unconditionally busy. By opening /dev/tty1
701 * we avoid this. Since tty1 is special and needs to be an
702 * explicitly loaded getty or DM this is safe. */
704 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
708 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
711 r = !!(vt_stat.v_state & (1 << vtnr));
713 close_nointr_nofail(fd);
718 int manager_spawn_autovt(Manager *m, int vtnr) {
720 DBusMessage *message = NULL, *reply = NULL;
722 const char *mode = "fail";
728 dbus_error_init(&error);
730 if ((unsigned) vtnr > m->n_autovts)
733 r = vt_is_busy(vtnr);
739 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
741 log_error("Could not allocate message.");
746 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
747 log_error("Could not allocate service name.");
752 if (!dbus_message_append_args(message,
753 DBUS_TYPE_STRING, &name,
754 DBUS_TYPE_STRING, &mode,
755 DBUS_TYPE_INVALID)) {
756 log_error("Could not attach target and flag information to message.");
761 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
763 log_error("Failed to start unit: %s", bus_error_message(&error));
773 dbus_message_unref(message);
776 dbus_message_unref(reply);
778 dbus_error_free(&error);
783 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
792 log_error("Out of memory.");
799 if (isempty(p) || streq(p, "/"))
802 s = hashmap_get(m->cgroups, p);
804 session_add_to_gc_queue(s);
806 assert_se(e = strrchr(p, '/'));
813 static void manager_pipe_notify_eof(Manager *m, int fd) {
819 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
820 assert(s->fifo_fd == fd);
821 session_remove_fifo(s);
826 static int manager_connect_bus(Manager *m) {
829 struct epoll_event ev;
833 assert(m->bus_fd < 0);
835 dbus_error_init(&error);
837 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
839 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
844 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
845 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
846 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
847 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
848 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
849 log_error("Not enough memory");
854 dbus_bus_add_match(m->bus,
856 "interface='org.freedesktop.systemd1.Agent',"
858 "path='/org/freedesktop/systemd1/agent'",
861 if (dbus_error_is_set(&error)) {
862 log_error("Failed to register match: %s", bus_error_message(&error));
867 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
868 if (dbus_error_is_set(&error)) {
869 log_error("Failed to register name on bus: %s", bus_error_message(&error));
874 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
875 log_error("Failed to acquire name.");
880 m->bus_fd = bus_loop_open(m->bus);
888 ev.data.u32 = FD_BUS;
890 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
896 dbus_error_free(&error);
901 static int manager_connect_console(Manager *m) {
902 struct epoll_event ev;
905 assert(m->console_active_fd < 0);
907 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
908 if (m->console_active_fd < 0) {
910 /* On certain architectures (S390 and Xen), /dev/tty0
911 does not exist, so don't fail if we can't open it.*/
915 log_error("Failed to open /sys/class/tty/tty0/active: %m");
921 ev.data.u32 = FD_CONSOLE;
923 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
929 static int manager_connect_udev(Manager *m) {
930 struct epoll_event ev;
934 assert(!m->udev_seat_monitor);
935 assert(!m->udev_vcsa_monitor);
937 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
938 if (!m->udev_seat_monitor)
941 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
945 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
949 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
953 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
957 ev.data.u32 = FD_SEAT_UDEV;
959 /* Don't bother watching VCSA devices, if nobody cares */
960 if (m->n_autovts <= 0 || m->console_active_fd < 0)
963 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
966 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
967 if (!m->udev_vcsa_monitor)
970 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
974 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
978 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
982 ev.data.u32 = FD_VCSA_UDEV;
984 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
990 void manager_gc(Manager *m, bool drop_not_started) {
997 while ((seat = m->seat_gc_queue)) {
998 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
999 seat->in_gc_queue = false;
1001 if (seat_check_gc(seat, drop_not_started) == 0) {
1007 while ((session = m->session_gc_queue)) {
1008 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
1009 session->in_gc_queue = false;
1011 if (session_check_gc(session, drop_not_started) == 0) {
1012 session_stop(session);
1013 session_free(session);
1017 while ((user = m->user_gc_queue)) {
1018 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1019 user->in_gc_queue = false;
1021 if (user_check_gc(user, drop_not_started) == 0) {
1028 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1030 bool idle_hint = true;
1031 dual_timestamp ts = { 0, 0 };
1036 HASHMAP_FOREACH(s, m->sessions, i) {
1040 ih = session_get_idle_hint(s, &k);
1046 if (k.monotonic < ts.monotonic)
1052 } else if (idle_hint) {
1054 if (k.monotonic > ts.monotonic)
1065 int manager_startup(Manager *m) {
1073 assert(m->epoll_fd <= 0);
1075 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1076 if (m->epoll_fd < 0)
1079 /* Connect to console */
1080 r = manager_connect_console(m);
1084 /* Connect to udev */
1085 r = manager_connect_udev(m);
1089 /* Connect to the bus */
1090 r = manager_connect_bus(m);
1094 /* Instantiate magic seat 0 */
1095 r = manager_add_seat(m, "seat0", &m->vtconsole);
1099 /* Deserialize state */
1100 manager_enumerate_devices(m);
1101 manager_enumerate_seats(m);
1102 manager_enumerate_users(m);
1103 manager_enumerate_sessions(m);
1105 /* Remove stale objects before we start them */
1106 manager_gc(m, false);
1108 /* And start everything */
1109 HASHMAP_FOREACH(seat, m->seats, i)
1112 HASHMAP_FOREACH(user, m->users, i)
1115 HASHMAP_FOREACH(session, m->sessions, i)
1116 session_start(session);
1121 int manager_run(Manager *m) {
1125 struct epoll_event event;
1128 manager_gc(m, true);
1130 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1133 manager_gc(m, true);
1135 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1137 if (errno == EINTR || errno == EAGAIN)
1140 log_error("epoll() failed: %m");
1144 switch (event.data.u32) {
1147 manager_dispatch_seat_udev(m);
1151 manager_dispatch_vcsa_udev(m);
1155 manager_dispatch_console(m);
1159 bus_loop_dispatch(m->bus_fd);
1163 if (event.data.u32 >= FD_FIFO_BASE)
1164 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1171 static int manager_parse_config_file(Manager *m) {
1178 fn = "/etc/systemd/systemd-logind.conf";
1179 f = fopen(fn, "re");
1181 if (errno == ENOENT)
1184 log_warning("Failed to open configuration file %s: %m", fn);
1188 r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
1190 log_warning("Failed to parse configuration file: %s", strerror(-r));
1197 int main(int argc, char *argv[]) {
1201 log_set_target(LOG_TARGET_AUTO);
1202 log_parse_environment();
1208 log_error("This program takes no arguments.");
1215 log_error("Out of memory");
1220 manager_parse_config_file(m);
1222 r = manager_startup(m);
1224 log_error("Failed to fully start up daemon: %s", strerror(-r));
1228 log_debug("systemd-logind running as pid %lu", (unsigned long) getpid());
1232 "STATUS=Processing requests...");
1236 log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid());
1240 "STATUS=Shutting down...");
1245 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;