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) {
70 if (cg_get_user_path(&m->cgroup_path) < 0) {
78 void manager_free(Manager *m) {
86 while ((session = hashmap_first(m->sessions)))
87 session_free(session);
89 while ((u = hashmap_first(m->users)))
92 while ((d = hashmap_first(m->devices)))
95 while ((s = hashmap_first(m->seats)))
98 hashmap_free(m->sessions);
99 hashmap_free(m->users);
100 hashmap_free(m->devices);
101 hashmap_free(m->seats);
102 hashmap_free(m->cgroups);
103 hashmap_free(m->fifo_fds);
105 if (m->console_active_fd >= 0)
106 close_nointr_nofail(m->console_active_fd);
108 if (m->udev_seat_monitor)
109 udev_monitor_unref(m->udev_seat_monitor);
111 if (m->udev_vcsa_monitor)
112 udev_monitor_unref(m->udev_vcsa_monitor);
118 dbus_connection_flush(m->bus);
119 dbus_connection_close(m->bus);
120 dbus_connection_unref(m->bus);
124 close_nointr_nofail(m->bus_fd);
126 if (m->epoll_fd >= 0)
127 close_nointr_nofail(m->epoll_fd);
129 strv_free(m->controllers);
130 strv_free(m->reset_controllers);
131 strv_free(m->kill_only_users);
132 strv_free(m->kill_exclude_users);
134 free(m->cgroup_path);
138 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
144 d = hashmap_get(m->devices, sysfs);
152 d = device_new(m, sysfs);
162 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
168 s = hashmap_get(m->seats, id);
186 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
192 s = hashmap_get(m->sessions, id);
200 s = session_new(m, u, id);
210 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
216 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
224 u = user_new(m, uid, gid, name);
234 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
243 return errno ? -errno : -ENOENT;
245 return manager_add_user(m, p->pw_uid, p->pw_gid, name, _user);
248 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
256 return errno ? -errno : -ENOENT;
258 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
261 int manager_process_seat_device(Manager *m, struct udev_device *d) {
267 /* FIXME: drop this check as soon as libudev's enum support
268 * honours tags and subsystem matches at the same time */
269 if (!streq_ptr(udev_device_get_subsystem(d), "graphics"))
272 if (streq_ptr(udev_device_get_action(d), "remove")) {
274 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
275 device = hashmap_get(m->devices, udev_device_get_sysname(d));
279 seat_add_to_gc_queue(device->seat);
286 sn = udev_device_get_property_value(d, "ID_SEAT");
290 if (!seat_name_is_valid(sn)) {
291 log_warning("Device with invalid seat name %s found, ignoring.", sn);
295 r = manager_add_device(m, udev_device_get_sysname(d), &device);
299 r = manager_add_seat(m, sn, &seat);
307 device_attach(device, seat);
314 int manager_enumerate_devices(Manager *m) {
315 struct udev_list_entry *item = NULL, *first = NULL;
316 struct udev_enumerate *e;
321 /* Loads devices from udev and creates seats for them as
324 e = udev_enumerate_new(m->udev);
330 r = udev_enumerate_add_match_subsystem(e, "graphics");
334 r = udev_enumerate_add_match_tag(e, "seat");
338 r = udev_enumerate_scan_devices(e);
342 first = udev_enumerate_get_list_entry(e);
343 udev_list_entry_foreach(item, first) {
344 struct udev_device *d;
347 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
353 k = manager_process_seat_device(m, d);
354 udev_device_unref(d);
362 udev_enumerate_unref(e);
367 int manager_enumerate_seats(Manager *m) {
374 /* This loads data about seats stored on disk, but does not
375 * actually create any seats. Removes data of seats that no
378 d = opendir("/run/systemd/seats");
383 log_error("Failed to open /run/systemd/seats: %m");
387 while ((de = readdir(d))) {
391 if (!dirent_is_file(de))
394 s = hashmap_get(m->seats, de->d_name);
396 unlinkat(dirfd(d), de->d_name, 0);
410 static int manager_enumerate_users_from_cgroup(Manager *m) {
415 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
420 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
424 while ((r = cg_read_subgroup(d, &name)) > 0) {
428 k = manager_add_user_by_name(m, name, &user);
435 user_add_to_gc_queue(user);
437 if (!user->cgroup_path)
438 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
453 static int manager_enumerate_linger_users(Manager *m) {
458 d = opendir("/var/lib/systemd/linger");
463 log_error("Failed to open /var/lib/systemd/linger/: %m");
467 while ((de = readdir(d))) {
470 if (!dirent_is_file(de))
473 k = manager_add_user_by_name(m, de->d_name, NULL);
475 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
485 int manager_enumerate_users(Manager *m) {
492 /* First, enumerate user cgroups */
493 r = manager_enumerate_users_from_cgroup(m);
495 /* Second, add lingering users on top */
496 k = manager_enumerate_linger_users(m);
500 /* Third, read in user data stored on disk */
501 d = opendir("/run/systemd/users");
506 log_error("Failed to open /run/systemd/users: %m");
510 while ((de = readdir(d))) {
514 if (!dirent_is_file(de))
517 k = safe_atolu(de->d_name, &ul);
519 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
523 u = hashmap_get(m->users, ULONG_TO_PTR(ul));
525 unlinkat(dirfd(d), de->d_name, 0);
539 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
544 HASHMAP_FOREACH(u, m->users, i) {
552 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
557 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
562 while ((k = cg_read_subgroup(d, &name)) > 0) {
565 k = manager_add_session(m, u, name, &session);
571 session_add_to_gc_queue(session);
573 if (!session->cgroup_path)
574 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
592 int manager_enumerate_sessions(Manager *m) {
599 /* First enumerate session cgroups */
600 r = manager_enumerate_sessions_from_cgroup(m);
602 /* Second, read in session data stored on disk */
603 d = opendir("/run/systemd/sessions");
608 log_error("Failed to open /run/systemd/sessions: %m");
612 while ((de = readdir(d))) {
616 if (!dirent_is_file(de))
619 s = hashmap_get(m->sessions, de->d_name);
621 unlinkat(dirfd(d), de->d_name, 0);
635 int manager_dispatch_seat_udev(Manager *m) {
636 struct udev_device *d;
641 d = udev_monitor_receive_device(m->udev_seat_monitor);
645 r = manager_process_seat_device(m, d);
646 udev_device_unref(d);
652 int manager_dispatch_vcsa_udev(Manager *m) {
653 struct udev_device *d;
659 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
663 name = udev_device_get_sysname(d);
665 /* Whenever a VCSA device is removed try to reallocate our
666 * VTs, to make sure our auto VTs never go away. */
668 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
669 r = seat_preallocate_vts(m->vtconsole);
671 udev_device_unref(d);
676 int manager_dispatch_console(Manager *m) {
680 seat_read_active_vt(m->vtconsole);
685 static int vt_is_busy(int vtnr) {
686 struct vt_stat vt_stat;
691 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
692 * we'd open the latter we'd open the foreground tty which
693 * hence would be unconditionally busy. By opening /dev/tty1
694 * we avoid this. Since tty1 is special and needs to be an
695 * explicitly loaded getty or DM this is safe. */
697 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
701 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
704 r = !!(vt_stat.v_state & (1 << vtnr));
706 close_nointr_nofail(fd);
711 int manager_spawn_autovt(Manager *m, int vtnr) {
713 DBusMessage *message = NULL, *reply = NULL;
715 const char *mode = "fail";
721 dbus_error_init(&error);
723 if ((unsigned) vtnr > m->n_autovts)
726 r = vt_is_busy(vtnr);
732 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
734 log_error("Could not allocate message.");
739 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
740 log_error("Could not allocate service name.");
745 if (!dbus_message_append_args(message,
746 DBUS_TYPE_STRING, &name,
747 DBUS_TYPE_STRING, &mode,
748 DBUS_TYPE_INVALID)) {
749 log_error("Could not attach target and flag information to message.");
754 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
756 log_error("Failed to start unit: %s", bus_error_message(&error));
766 dbus_message_unref(message);
769 dbus_message_unref(reply);
771 dbus_error_free(&error);
776 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
785 log_error("Out of memory.");
792 if (isempty(p) || streq(p, "/"))
795 s = hashmap_get(m->cgroups, p);
797 session_add_to_gc_queue(s);
799 assert_se(e = strrchr(p, '/'));
806 static void manager_pipe_notify_eof(Manager *m, int fd) {
812 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
813 assert(s->fifo_fd == fd);
814 session_remove_fifo(s);
819 static int manager_connect_bus(Manager *m) {
822 struct epoll_event ev;
826 assert(m->bus_fd < 0);
828 dbus_error_init(&error);
830 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
832 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
837 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
838 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
839 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
840 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
841 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
842 log_error("Not enough memory");
847 dbus_bus_add_match(m->bus,
849 "interface='org.freedesktop.systemd1.Agent',"
851 "path='/org/freedesktop/systemd1/agent'",
854 if (dbus_error_is_set(&error)) {
855 log_error("Failed to register match: %s", bus_error_message(&error));
860 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
861 if (dbus_error_is_set(&error)) {
862 log_error("Failed to register name on bus: %s", bus_error_message(&error));
867 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
868 log_error("Failed to acquire name.");
873 m->bus_fd = bus_loop_open(m->bus);
881 ev.data.u32 = FD_BUS;
883 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
889 dbus_error_free(&error);
894 static int manager_connect_console(Manager *m) {
895 struct epoll_event ev;
898 assert(m->console_active_fd < 0);
900 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
901 if (m->console_active_fd < 0) {
902 log_error("Failed to open /sys/class/tty/tty0/active: %m");
908 ev.data.u32 = FD_CONSOLE;
910 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
916 static int manager_connect_udev(Manager *m) {
917 struct epoll_event ev;
921 assert(!m->udev_seat_monitor);
922 assert(!m->udev_vcsa_monitor);
924 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
925 if (!m->udev_seat_monitor)
928 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
932 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
936 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
940 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
944 ev.data.u32 = FD_SEAT_UDEV;
946 if (m->n_autovts <= 0)
949 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
952 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
953 if (!m->udev_vcsa_monitor)
956 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
960 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
964 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
968 ev.data.u32 = FD_VCSA_UDEV;
970 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
976 void manager_gc(Manager *m) {
983 while ((seat = m->seat_gc_queue)) {
984 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
985 seat->in_gc_queue = false;
987 if (seat_check_gc(seat) == 0) {
993 while ((session = m->session_gc_queue)) {
994 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
995 session->in_gc_queue = false;
997 if (session_check_gc(session) == 0) {
998 session_stop(session);
999 session_free(session);
1003 while ((user = m->user_gc_queue)) {
1004 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1005 user->in_gc_queue = false;
1007 if (user_check_gc(user) == 0) {
1014 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1016 bool idle_hint = true;
1017 dual_timestamp ts = { 0, 0 };
1022 HASHMAP_FOREACH(s, m->sessions, i) {
1026 ih = session_get_idle_hint(s, &k);
1032 if (k.monotonic < ts.monotonic)
1038 } else if (idle_hint) {
1040 if (k.monotonic > ts.monotonic)
1051 int manager_startup(Manager *m) {
1059 assert(m->epoll_fd <= 0);
1061 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1062 if (m->epoll_fd < 0)
1065 /* Connect to udev */
1066 r = manager_connect_udev(m);
1070 /* Connect to console */
1071 r = manager_connect_console(m);
1075 /* Connect to the bus */
1076 r = manager_connect_bus(m);
1080 /* Instantiate magic seat 0 */
1081 r = manager_add_seat(m, "seat0", &m->vtconsole);
1085 /* Deserialize state */
1086 manager_enumerate_devices(m);
1087 manager_enumerate_seats(m);
1088 manager_enumerate_users(m);
1089 manager_enumerate_sessions(m);
1091 /* And start everything */
1092 HASHMAP_FOREACH(seat, m->seats, i)
1095 HASHMAP_FOREACH(user, m->users, i)
1098 HASHMAP_FOREACH(session, m->sessions, i)
1099 session_start(session);
1104 int manager_run(Manager *m) {
1108 struct epoll_event event;
1113 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1118 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1120 if (errno == EINTR || errno == EAGAIN)
1123 log_error("epoll() failed: %m");
1127 switch (event.data.u32) {
1130 manager_dispatch_seat_udev(m);
1134 manager_dispatch_vcsa_udev(m);
1138 manager_dispatch_console(m);
1142 bus_loop_dispatch(m->bus_fd);
1146 if (event.data.u32 >= FD_FIFO_BASE)
1147 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1154 static int manager_parse_config_file(Manager *m) {
1156 const ConfigItem items[] = {
1157 { "NAutoVTs", config_parse_unsigned, 0, &m->n_autovts, "Login" },
1158 { "KillUserProcesses", config_parse_bool, 0, &m->kill_user_processes, "Login" },
1159 { "KilOnlyUsers", config_parse_strv, 0, &m->kill_only_users, "Login" },
1160 { "KillExcludeUsers", config_parse_strv, 0, &m->kill_exclude_users, "Login" },
1161 { "Controllers", config_parse_strv, 0, &m->controllers, "Login" },
1162 { "ResetControllers", config_parse_strv, 0, &m->reset_controllers, "Login" },
1163 { NULL, NULL, 0, NULL, NULL }
1166 static const char * const sections[] = {
1177 fn = "/etc/systemd/systemd-logind.conf";
1178 f = fopen(fn, "re");
1180 if (errno == ENOENT)
1183 log_warning("Failed to open configuration file %s: %m", fn);
1187 r = config_parse(fn, f, sections, items, false, NULL);
1189 log_warning("Failed to parse configuration file: %s", strerror(-r));
1196 int main(int argc, char *argv[]) {
1200 log_set_target(LOG_TARGET_AUTO);
1201 log_parse_environment();
1205 log_error("This program takes no arguments.");
1214 log_error("Out of memory");
1219 manager_parse_config_file(m);
1221 r = manager_startup(m);
1223 log_error("Failed to fully start up daemon: %s", strerror(-r));
1233 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;