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 "dbus-common.h"
34 #include "dbus-loop.h"
36 #include "conf-parser.h"
38 Manager *manager_new(void) {
45 m->console_active_fd = -1;
52 m->devices = hashmap_new(string_hash_func, string_compare_func);
53 m->seats = hashmap_new(string_hash_func, string_compare_func);
54 m->sessions = hashmap_new(string_hash_func, string_compare_func);
55 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
56 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
57 m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
59 if (!m->devices || !m->seats || !m->sessions || !m->users || !m->cgroups || !m->fifo_fds) {
64 m->reset_controllers = strv_new("cpu", NULL);
65 m->kill_exclude_users = strv_new("root", NULL);
66 if (!m->reset_controllers || !m->kill_exclude_users) {
77 if (cg_get_user_path(&m->cgroup_path) < 0) {
85 void manager_free(Manager *m) {
93 while ((session = hashmap_first(m->sessions)))
94 session_free(session);
96 while ((u = hashmap_first(m->users)))
99 while ((d = hashmap_first(m->devices)))
102 while ((s = hashmap_first(m->seats)))
105 hashmap_free(m->sessions);
106 hashmap_free(m->users);
107 hashmap_free(m->devices);
108 hashmap_free(m->seats);
109 hashmap_free(m->cgroups);
110 hashmap_free(m->fifo_fds);
112 if (m->console_active_fd >= 0)
113 close_nointr_nofail(m->console_active_fd);
115 if (m->udev_seat_monitor)
116 udev_monitor_unref(m->udev_seat_monitor);
118 if (m->udev_vcsa_monitor)
119 udev_monitor_unref(m->udev_vcsa_monitor);
125 dbus_connection_flush(m->bus);
126 dbus_connection_close(m->bus);
127 dbus_connection_unref(m->bus);
131 close_nointr_nofail(m->bus_fd);
133 if (m->epoll_fd >= 0)
134 close_nointr_nofail(m->epoll_fd);
136 strv_free(m->controllers);
137 strv_free(m->reset_controllers);
138 strv_free(m->kill_only_users);
139 strv_free(m->kill_exclude_users);
141 free(m->cgroup_path);
145 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
151 d = hashmap_get(m->devices, sysfs);
159 d = device_new(m, sysfs);
169 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
175 s = hashmap_get(m->seats, id);
193 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
199 s = hashmap_get(m->sessions, id);
207 s = session_new(m, u, id);
217 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
223 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
231 u = user_new(m, uid, gid, name);
241 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
249 r = get_user_creds(&name, &uid, &gid, NULL);
253 return manager_add_user(m, uid, gid, name, _user);
256 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
264 return errno ? -errno : -ENOENT;
266 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
269 int manager_process_seat_device(Manager *m, struct udev_device *d) {
275 if (streq_ptr(udev_device_get_action(d), "remove")) {
277 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
278 device = hashmap_get(m->devices, udev_device_get_sysname(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_sysname(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) {
418 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
423 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
427 while ((r = 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) {
455 static int manager_enumerate_linger_users(Manager *m) {
460 d = opendir("/var/lib/systemd/linger");
465 log_error("Failed to open /var/lib/systemd/linger/: %m");
469 while ((de = readdir(d))) {
472 if (!dirent_is_file(de))
475 k = manager_add_user_by_name(m, de->d_name, NULL);
477 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
487 int manager_enumerate_users(Manager *m) {
494 /* First, enumerate user cgroups */
495 r = manager_enumerate_users_from_cgroup(m);
497 /* Second, add lingering users on top */
498 k = manager_enumerate_linger_users(m);
502 /* Third, read in user data stored on disk */
503 d = opendir("/run/systemd/users");
508 log_error("Failed to open /run/systemd/users: %m");
512 while ((de = readdir(d))) {
516 if (!dirent_is_file(de))
519 k = parse_uid(de->d_name, &uid);
521 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
525 u = hashmap_get(m->users, ULONG_TO_PTR(uid));
527 unlinkat(dirfd(d), de->d_name, 0);
541 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
546 HASHMAP_FOREACH(u, m->users, i) {
554 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
559 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
564 while ((k = cg_read_subgroup(d, &name)) > 0) {
567 if (streq(name, "shared"))
570 k = manager_add_session(m, u, name, &session);
576 session_add_to_gc_queue(session);
578 if (!session->cgroup_path)
579 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
597 int manager_enumerate_sessions(Manager *m) {
604 /* First enumerate session cgroups */
605 r = manager_enumerate_sessions_from_cgroup(m);
607 /* Second, read in session data stored on disk */
608 d = opendir("/run/systemd/sessions");
613 log_error("Failed to open /run/systemd/sessions: %m");
617 while ((de = readdir(d))) {
621 if (!dirent_is_file(de))
624 s = hashmap_get(m->sessions, de->d_name);
626 unlinkat(dirfd(d), de->d_name, 0);
640 int manager_dispatch_seat_udev(Manager *m) {
641 struct udev_device *d;
646 d = udev_monitor_receive_device(m->udev_seat_monitor);
650 r = manager_process_seat_device(m, d);
651 udev_device_unref(d);
657 int manager_dispatch_vcsa_udev(Manager *m) {
658 struct udev_device *d;
664 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
668 name = udev_device_get_sysname(d);
670 /* Whenever a VCSA device is removed try to reallocate our
671 * VTs, to make sure our auto VTs never go away. */
673 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
674 r = seat_preallocate_vts(m->vtconsole);
676 udev_device_unref(d);
681 int manager_dispatch_console(Manager *m) {
685 seat_read_active_vt(m->vtconsole);
690 static int vt_is_busy(int vtnr) {
691 struct vt_stat vt_stat;
696 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
697 * we'd open the latter we'd open the foreground tty which
698 * hence would be unconditionally busy. By opening /dev/tty1
699 * we avoid this. Since tty1 is special and needs to be an
700 * explicitly loaded getty or DM this is safe. */
702 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
706 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
709 r = !!(vt_stat.v_state & (1 << vtnr));
711 close_nointr_nofail(fd);
716 int manager_spawn_autovt(Manager *m, int vtnr) {
718 DBusMessage *message = NULL, *reply = NULL;
720 const char *mode = "fail";
726 dbus_error_init(&error);
728 if ((unsigned) vtnr > m->n_autovts)
731 r = vt_is_busy(vtnr);
737 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
739 log_error("Could not allocate message.");
744 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
745 log_error("Could not allocate service name.");
750 if (!dbus_message_append_args(message,
751 DBUS_TYPE_STRING, &name,
752 DBUS_TYPE_STRING, &mode,
753 DBUS_TYPE_INVALID)) {
754 log_error("Could not attach target and flag information to message.");
759 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
761 log_error("Failed to start unit: %s", bus_error_message(&error));
771 dbus_message_unref(message);
774 dbus_message_unref(reply);
776 dbus_error_free(&error);
781 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
790 log_error("Out of memory.");
797 if (isempty(p) || streq(p, "/"))
800 s = hashmap_get(m->cgroups, p);
802 session_add_to_gc_queue(s);
804 assert_se(e = strrchr(p, '/'));
811 static void manager_pipe_notify_eof(Manager *m, int fd) {
817 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
818 assert(s->fifo_fd == fd);
819 session_remove_fifo(s);
824 static int manager_connect_bus(Manager *m) {
827 struct epoll_event ev;
831 assert(m->bus_fd < 0);
833 dbus_error_init(&error);
835 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
837 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
842 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
843 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
844 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
845 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
846 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
847 log_error("Not enough memory");
852 dbus_bus_add_match(m->bus,
854 "interface='org.freedesktop.systemd1.Agent',"
856 "path='/org/freedesktop/systemd1/agent'",
859 if (dbus_error_is_set(&error)) {
860 log_error("Failed to register match: %s", bus_error_message(&error));
865 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
866 if (dbus_error_is_set(&error)) {
867 log_error("Failed to register name on bus: %s", bus_error_message(&error));
872 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
873 log_error("Failed to acquire name.");
878 m->bus_fd = bus_loop_open(m->bus);
886 ev.data.u32 = FD_BUS;
888 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
894 dbus_error_free(&error);
899 static int manager_connect_console(Manager *m) {
900 struct epoll_event ev;
903 assert(m->console_active_fd < 0);
905 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
906 if (m->console_active_fd < 0) {
907 log_error("Failed to open /sys/class/tty/tty0/active: %m");
913 ev.data.u32 = FD_CONSOLE;
915 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
921 static int manager_connect_udev(Manager *m) {
922 struct epoll_event ev;
926 assert(!m->udev_seat_monitor);
927 assert(!m->udev_vcsa_monitor);
929 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
930 if (!m->udev_seat_monitor)
933 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
937 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
941 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
945 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
949 ev.data.u32 = FD_SEAT_UDEV;
951 if (m->n_autovts <= 0)
954 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
957 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
958 if (!m->udev_vcsa_monitor)
961 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
965 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
969 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
973 ev.data.u32 = FD_VCSA_UDEV;
975 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
981 void manager_gc(Manager *m, bool drop_not_started) {
988 while ((seat = m->seat_gc_queue)) {
989 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
990 seat->in_gc_queue = false;
992 if (seat_check_gc(seat, drop_not_started) == 0) {
998 while ((session = m->session_gc_queue)) {
999 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
1000 session->in_gc_queue = false;
1002 if (session_check_gc(session, drop_not_started) == 0) {
1003 session_stop(session);
1004 session_free(session);
1008 while ((user = m->user_gc_queue)) {
1009 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1010 user->in_gc_queue = false;
1012 if (user_check_gc(user, drop_not_started) == 0) {
1019 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1021 bool idle_hint = true;
1022 dual_timestamp ts = { 0, 0 };
1027 HASHMAP_FOREACH(s, m->sessions, i) {
1031 ih = session_get_idle_hint(s, &k);
1037 if (k.monotonic < ts.monotonic)
1043 } else if (idle_hint) {
1045 if (k.monotonic > ts.monotonic)
1056 int manager_startup(Manager *m) {
1064 assert(m->epoll_fd <= 0);
1066 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1067 if (m->epoll_fd < 0)
1070 /* Connect to udev */
1071 r = manager_connect_udev(m);
1075 /* Connect to console */
1076 r = manager_connect_console(m);
1080 /* Connect to the bus */
1081 r = manager_connect_bus(m);
1085 /* Instantiate magic seat 0 */
1086 r = manager_add_seat(m, "seat0", &m->vtconsole);
1090 /* Deserialize state */
1091 manager_enumerate_devices(m);
1092 manager_enumerate_seats(m);
1093 manager_enumerate_users(m);
1094 manager_enumerate_sessions(m);
1096 /* Remove stale objects before we start them */
1097 manager_gc(m, false);
1099 /* And start everything */
1100 HASHMAP_FOREACH(seat, m->seats, i)
1103 HASHMAP_FOREACH(user, m->users, i)
1106 HASHMAP_FOREACH(session, m->sessions, i)
1107 session_start(session);
1112 int manager_run(Manager *m) {
1116 struct epoll_event event;
1119 manager_gc(m, true);
1121 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1124 manager_gc(m, true);
1126 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1128 if (errno == EINTR || errno == EAGAIN)
1131 log_error("epoll() failed: %m");
1135 switch (event.data.u32) {
1138 manager_dispatch_seat_udev(m);
1142 manager_dispatch_vcsa_udev(m);
1146 manager_dispatch_console(m);
1150 bus_loop_dispatch(m->bus_fd);
1154 if (event.data.u32 >= FD_FIFO_BASE)
1155 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1162 static int manager_parse_config_file(Manager *m) {
1169 fn = "/etc/systemd/systemd-logind.conf";
1170 f = fopen(fn, "re");
1172 if (errno == ENOENT)
1175 log_warning("Failed to open configuration file %s: %m", fn);
1179 r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
1181 log_warning("Failed to parse configuration file: %s", strerror(-r));
1188 int main(int argc, char *argv[]) {
1192 log_set_target(LOG_TARGET_AUTO);
1193 log_parse_environment();
1199 log_error("This program takes no arguments.");
1206 log_error("Out of memory");
1211 manager_parse_config_file(m);
1213 r = manager_startup(m);
1215 log_error("Failed to fully start up daemon: %s", strerror(-r));
1225 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;