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 if (streq_ptr(udev_device_get_action(d), "remove")) {
269 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
270 device = hashmap_get(m->devices, udev_device_get_sysname(d));
274 seat_add_to_gc_queue(device->seat);
281 sn = udev_device_get_property_value(d, "ID_SEAT");
285 if (!seat_name_is_valid(sn)) {
286 log_warning("Device with invalid seat name %s found, ignoring.", sn);
290 r = manager_add_device(m, udev_device_get_sysname(d), &device);
294 r = manager_add_seat(m, sn, &seat);
302 device_attach(device, seat);
309 int manager_enumerate_devices(Manager *m) {
310 struct udev_list_entry *item = NULL, *first = NULL;
311 struct udev_enumerate *e;
316 /* Loads devices from udev and creates seats for them as
319 e = udev_enumerate_new(m->udev);
325 r = udev_enumerate_add_match_subsystem(e, "graphics");
329 r = udev_enumerate_add_match_tag(e, "seat");
333 r = udev_enumerate_scan_devices(e);
337 first = udev_enumerate_get_list_entry(e);
338 udev_list_entry_foreach(item, first) {
339 struct udev_device *d;
342 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
348 k = manager_process_seat_device(m, d);
349 udev_device_unref(d);
357 udev_enumerate_unref(e);
362 int manager_enumerate_seats(Manager *m) {
369 /* This loads data about seats stored on disk, but does not
370 * actually create any seats. Removes data of seats that no
373 d = opendir("/run/systemd/seats");
378 log_error("Failed to open /run/systemd/seats: %m");
382 while ((de = readdir(d))) {
386 if (!dirent_is_file(de))
389 s = hashmap_get(m->seats, de->d_name);
391 unlinkat(dirfd(d), de->d_name, 0);
405 static int manager_enumerate_users_from_cgroup(Manager *m) {
410 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
415 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
419 while ((r = cg_read_subgroup(d, &name)) > 0) {
423 k = manager_add_user_by_name(m, name, &user);
430 user_add_to_gc_queue(user);
432 if (!user->cgroup_path)
433 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
448 static int manager_enumerate_linger_users(Manager *m) {
453 d = opendir("/var/lib/systemd/linger");
458 log_error("Failed to open /var/lib/systemd/linger/: %m");
462 while ((de = readdir(d))) {
465 if (!dirent_is_file(de))
468 k = manager_add_user_by_name(m, de->d_name, NULL);
470 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
480 int manager_enumerate_users(Manager *m) {
487 /* First, enumerate user cgroups */
488 r = manager_enumerate_users_from_cgroup(m);
490 /* Second, add lingering users on top */
491 k = manager_enumerate_linger_users(m);
495 /* Third, read in user data stored on disk */
496 d = opendir("/run/systemd/users");
501 log_error("Failed to open /run/systemd/users: %m");
505 while ((de = readdir(d))) {
509 if (!dirent_is_file(de))
512 k = safe_atolu(de->d_name, &ul);
514 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
518 u = hashmap_get(m->users, ULONG_TO_PTR(ul));
520 unlinkat(dirfd(d), de->d_name, 0);
534 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
539 HASHMAP_FOREACH(u, m->users, i) {
547 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
552 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
557 while ((k = cg_read_subgroup(d, &name)) > 0) {
560 k = manager_add_session(m, u, name, &session);
566 session_add_to_gc_queue(session);
568 if (!session->cgroup_path)
569 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
587 int manager_enumerate_sessions(Manager *m) {
594 /* First enumerate session cgroups */
595 r = manager_enumerate_sessions_from_cgroup(m);
597 /* Second, read in session data stored on disk */
598 d = opendir("/run/systemd/sessions");
603 log_error("Failed to open /run/systemd/sessions: %m");
607 while ((de = readdir(d))) {
611 if (!dirent_is_file(de))
614 s = hashmap_get(m->sessions, de->d_name);
616 unlinkat(dirfd(d), de->d_name, 0);
630 int manager_dispatch_seat_udev(Manager *m) {
631 struct udev_device *d;
636 d = udev_monitor_receive_device(m->udev_seat_monitor);
640 r = manager_process_seat_device(m, d);
641 udev_device_unref(d);
647 int manager_dispatch_vcsa_udev(Manager *m) {
648 struct udev_device *d;
654 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
658 name = udev_device_get_sysname(d);
660 /* Whenever a VCSA device is removed try to reallocate our
661 * VTs, to make sure our auto VTs never go away. */
663 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
664 r = seat_preallocate_vts(m->vtconsole);
666 udev_device_unref(d);
671 int manager_dispatch_console(Manager *m) {
675 seat_read_active_vt(m->vtconsole);
680 static int vt_is_busy(int vtnr) {
681 struct vt_stat vt_stat;
686 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
687 * we'd open the latter we'd open the foreground tty which
688 * hence would be unconditionally busy. By opening /dev/tty1
689 * we avoid this. Since tty1 is special and needs to be an
690 * explicitly loaded getty or DM this is safe. */
692 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
696 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
699 r = !!(vt_stat.v_state & (1 << vtnr));
701 close_nointr_nofail(fd);
706 int manager_spawn_autovt(Manager *m, int vtnr) {
708 DBusMessage *message = NULL, *reply = NULL;
710 const char *mode = "fail";
716 dbus_error_init(&error);
718 if ((unsigned) vtnr > m->n_autovts)
721 r = vt_is_busy(vtnr);
727 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
729 log_error("Could not allocate message.");
734 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
735 log_error("Could not allocate service name.");
740 if (!dbus_message_append_args(message,
741 DBUS_TYPE_STRING, &name,
742 DBUS_TYPE_STRING, &mode,
743 DBUS_TYPE_INVALID)) {
744 log_error("Could not attach target and flag information to message.");
749 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
751 log_error("Failed to start unit: %s", bus_error_message(&error));
761 dbus_message_unref(message);
764 dbus_message_unref(reply);
766 dbus_error_free(&error);
771 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
780 log_error("Out of memory.");
787 if (isempty(p) || streq(p, "/"))
790 s = hashmap_get(m->cgroups, p);
792 session_add_to_gc_queue(s);
794 assert_se(e = strrchr(p, '/'));
801 static void manager_pipe_notify_eof(Manager *m, int fd) {
807 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
808 assert(s->fifo_fd == fd);
809 session_remove_fifo(s);
814 static int manager_connect_bus(Manager *m) {
817 struct epoll_event ev;
821 assert(m->bus_fd < 0);
823 dbus_error_init(&error);
825 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
827 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
832 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
833 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
834 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
835 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
836 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
837 log_error("Not enough memory");
842 dbus_bus_add_match(m->bus,
844 "interface='org.freedesktop.systemd1.Agent',"
846 "path='/org/freedesktop/systemd1/agent'",
849 if (dbus_error_is_set(&error)) {
850 log_error("Failed to register match: %s", bus_error_message(&error));
855 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
856 if (dbus_error_is_set(&error)) {
857 log_error("Failed to register name on bus: %s", bus_error_message(&error));
862 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
863 log_error("Failed to acquire name.");
868 m->bus_fd = bus_loop_open(m->bus);
876 ev.data.u32 = FD_BUS;
878 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
884 dbus_error_free(&error);
889 static int manager_connect_console(Manager *m) {
890 struct epoll_event ev;
893 assert(m->console_active_fd < 0);
895 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
896 if (m->console_active_fd < 0) {
897 log_error("Failed to open /sys/class/tty/tty0/active: %m");
903 ev.data.u32 = FD_CONSOLE;
905 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
911 static int manager_connect_udev(Manager *m) {
912 struct epoll_event ev;
916 assert(!m->udev_seat_monitor);
917 assert(!m->udev_vcsa_monitor);
919 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
920 if (!m->udev_seat_monitor)
923 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
927 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
931 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
935 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
939 ev.data.u32 = FD_SEAT_UDEV;
941 if (m->n_autovts <= 0)
944 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
947 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
948 if (!m->udev_vcsa_monitor)
951 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
955 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
959 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
963 ev.data.u32 = FD_VCSA_UDEV;
965 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
971 void manager_gc(Manager *m) {
978 while ((seat = m->seat_gc_queue)) {
979 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
980 seat->in_gc_queue = false;
982 if (seat_check_gc(seat) == 0) {
988 while ((session = m->session_gc_queue)) {
989 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
990 session->in_gc_queue = false;
992 if (session_check_gc(session) == 0) {
993 session_stop(session);
994 session_free(session);
998 while ((user = m->user_gc_queue)) {
999 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1000 user->in_gc_queue = false;
1002 if (user_check_gc(user) == 0) {
1009 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1011 bool idle_hint = true;
1012 dual_timestamp ts = { 0, 0 };
1017 HASHMAP_FOREACH(s, m->sessions, i) {
1021 ih = session_get_idle_hint(s, &k);
1027 if (k.monotonic < ts.monotonic)
1033 } else if (idle_hint) {
1035 if (k.monotonic > ts.monotonic)
1046 int manager_startup(Manager *m) {
1054 assert(m->epoll_fd <= 0);
1056 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1057 if (m->epoll_fd < 0)
1060 /* Connect to udev */
1061 r = manager_connect_udev(m);
1065 /* Connect to console */
1066 r = manager_connect_console(m);
1070 /* Connect to the bus */
1071 r = manager_connect_bus(m);
1075 /* Instantiate magic seat 0 */
1076 r = manager_add_seat(m, "seat0", &m->vtconsole);
1080 /* Deserialize state */
1081 manager_enumerate_devices(m);
1082 manager_enumerate_seats(m);
1083 manager_enumerate_users(m);
1084 manager_enumerate_sessions(m);
1086 /* And start everything */
1087 HASHMAP_FOREACH(seat, m->seats, i)
1090 HASHMAP_FOREACH(user, m->users, i)
1093 HASHMAP_FOREACH(session, m->sessions, i)
1094 session_start(session);
1099 int manager_run(Manager *m) {
1103 struct epoll_event event;
1108 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1113 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1115 if (errno == EINTR || errno == EAGAIN)
1118 log_error("epoll() failed: %m");
1122 switch (event.data.u32) {
1125 manager_dispatch_seat_udev(m);
1129 manager_dispatch_vcsa_udev(m);
1133 manager_dispatch_console(m);
1137 bus_loop_dispatch(m->bus_fd);
1141 if (event.data.u32 >= FD_FIFO_BASE)
1142 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1149 static int manager_parse_config_file(Manager *m) {
1151 const ConfigItem items[] = {
1152 { "NAutoVTs", config_parse_unsigned, 0, &m->n_autovts, "Login" },
1153 { "KillUserProcesses", config_parse_bool, 0, &m->kill_user_processes, "Login" },
1154 { "KilOnlyUsers", config_parse_strv, 0, &m->kill_only_users, "Login" },
1155 { "KillExcludeUsers", config_parse_strv, 0, &m->kill_exclude_users, "Login" },
1156 { "Controllers", config_parse_strv, 0, &m->controllers, "Login" },
1157 { "ResetControllers", config_parse_strv, 0, &m->reset_controllers, "Login" },
1158 { NULL, NULL, 0, NULL, NULL }
1161 static const char * const sections[] = {
1172 fn = "/etc/systemd/systemd-logind.conf";
1173 f = fopen(fn, "re");
1175 if (errno == ENOENT)
1178 log_warning("Failed to open configuration file %s: %m", fn);
1182 r = config_parse(fn, f, sections, items, false, NULL);
1184 log_warning("Failed to parse configuration file: %s", strerror(-r));
1191 int main(int argc, char *argv[]) {
1195 log_set_target(LOG_TARGET_AUTO);
1196 log_parse_environment();
1200 log_error("This program takes no arguments.");
1209 log_error("Out of memory");
1214 manager_parse_config_file(m);
1216 r = manager_startup(m);
1218 log_error("Failed to fully start up daemon: %s", strerror(-r));
1228 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;