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) {
250 return errno ? -errno : -ENOENT;
252 return manager_add_user(m, p->pw_uid, p->pw_gid, name, _user);
255 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
263 return errno ? -errno : -ENOENT;
265 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
268 int manager_process_seat_device(Manager *m, struct udev_device *d) {
274 if (streq_ptr(udev_device_get_action(d), "remove")) {
276 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
277 device = hashmap_get(m->devices, udev_device_get_sysname(d));
281 seat_add_to_gc_queue(device->seat);
288 sn = udev_device_get_property_value(d, "ID_SEAT");
292 if (!seat_name_is_valid(sn)) {
293 log_warning("Device with invalid seat name %s found, ignoring.", sn);
297 r = manager_add_device(m, udev_device_get_sysname(d), &device);
301 r = manager_add_seat(m, sn, &seat);
309 device_attach(device, seat);
316 int manager_enumerate_devices(Manager *m) {
317 struct udev_list_entry *item = NULL, *first = NULL;
318 struct udev_enumerate *e;
323 /* Loads devices from udev and creates seats for them as
326 e = udev_enumerate_new(m->udev);
332 r = udev_enumerate_add_match_subsystem(e, "graphics");
336 r = udev_enumerate_add_match_tag(e, "seat");
340 r = udev_enumerate_scan_devices(e);
344 first = udev_enumerate_get_list_entry(e);
345 udev_list_entry_foreach(item, first) {
346 struct udev_device *d;
349 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
355 k = manager_process_seat_device(m, d);
356 udev_device_unref(d);
364 udev_enumerate_unref(e);
369 int manager_enumerate_seats(Manager *m) {
376 /* This loads data about seats stored on disk, but does not
377 * actually create any seats. Removes data of seats that no
380 d = opendir("/run/systemd/seats");
385 log_error("Failed to open /run/systemd/seats: %m");
389 while ((de = readdir(d))) {
393 if (!dirent_is_file(de))
396 s = hashmap_get(m->seats, de->d_name);
398 unlinkat(dirfd(d), de->d_name, 0);
412 static int manager_enumerate_users_from_cgroup(Manager *m) {
417 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
422 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
426 while ((r = cg_read_subgroup(d, &name)) > 0) {
430 k = manager_add_user_by_name(m, name, &user);
437 user_add_to_gc_queue(user);
439 if (!user->cgroup_path)
440 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 = safe_atolu(de->d_name, &ul);
521 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
525 u = hashmap_get(m->users, ULONG_TO_PTR(ul));
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 k = manager_add_session(m, u, name, &session);
573 session_add_to_gc_queue(session);
575 if (!session->cgroup_path)
576 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
594 int manager_enumerate_sessions(Manager *m) {
601 /* First enumerate session cgroups */
602 r = manager_enumerate_sessions_from_cgroup(m);
604 /* Second, read in session data stored on disk */
605 d = opendir("/run/systemd/sessions");
610 log_error("Failed to open /run/systemd/sessions: %m");
614 while ((de = readdir(d))) {
618 if (!dirent_is_file(de))
621 s = hashmap_get(m->sessions, de->d_name);
623 unlinkat(dirfd(d), de->d_name, 0);
637 int manager_dispatch_seat_udev(Manager *m) {
638 struct udev_device *d;
643 d = udev_monitor_receive_device(m->udev_seat_monitor);
647 r = manager_process_seat_device(m, d);
648 udev_device_unref(d);
654 int manager_dispatch_vcsa_udev(Manager *m) {
655 struct udev_device *d;
661 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
665 name = udev_device_get_sysname(d);
667 /* Whenever a VCSA device is removed try to reallocate our
668 * VTs, to make sure our auto VTs never go away. */
670 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
671 r = seat_preallocate_vts(m->vtconsole);
673 udev_device_unref(d);
678 int manager_dispatch_console(Manager *m) {
682 seat_read_active_vt(m->vtconsole);
687 static int vt_is_busy(int vtnr) {
688 struct vt_stat vt_stat;
693 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
694 * we'd open the latter we'd open the foreground tty which
695 * hence would be unconditionally busy. By opening /dev/tty1
696 * we avoid this. Since tty1 is special and needs to be an
697 * explicitly loaded getty or DM this is safe. */
699 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
703 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
706 r = !!(vt_stat.v_state & (1 << vtnr));
708 close_nointr_nofail(fd);
713 int manager_spawn_autovt(Manager *m, int vtnr) {
715 DBusMessage *message = NULL, *reply = NULL;
717 const char *mode = "fail";
723 dbus_error_init(&error);
725 if ((unsigned) vtnr > m->n_autovts)
728 r = vt_is_busy(vtnr);
734 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
736 log_error("Could not allocate message.");
741 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
742 log_error("Could not allocate service name.");
747 if (!dbus_message_append_args(message,
748 DBUS_TYPE_STRING, &name,
749 DBUS_TYPE_STRING, &mode,
750 DBUS_TYPE_INVALID)) {
751 log_error("Could not attach target and flag information to message.");
756 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
758 log_error("Failed to start unit: %s", bus_error_message(&error));
768 dbus_message_unref(message);
771 dbus_message_unref(reply);
773 dbus_error_free(&error);
778 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
787 log_error("Out of memory.");
794 if (isempty(p) || streq(p, "/"))
797 s = hashmap_get(m->cgroups, p);
799 session_add_to_gc_queue(s);
801 assert_se(e = strrchr(p, '/'));
808 static void manager_pipe_notify_eof(Manager *m, int fd) {
814 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
815 assert(s->fifo_fd == fd);
816 session_remove_fifo(s);
821 static int manager_connect_bus(Manager *m) {
824 struct epoll_event ev;
828 assert(m->bus_fd < 0);
830 dbus_error_init(&error);
832 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
834 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
839 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
840 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
841 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
842 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
843 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
844 log_error("Not enough memory");
849 dbus_bus_add_match(m->bus,
851 "interface='org.freedesktop.systemd1.Agent',"
853 "path='/org/freedesktop/systemd1/agent'",
856 if (dbus_error_is_set(&error)) {
857 log_error("Failed to register match: %s", bus_error_message(&error));
862 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
863 if (dbus_error_is_set(&error)) {
864 log_error("Failed to register name on bus: %s", bus_error_message(&error));
869 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
870 log_error("Failed to acquire name.");
875 m->bus_fd = bus_loop_open(m->bus);
883 ev.data.u32 = FD_BUS;
885 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
891 dbus_error_free(&error);
896 static int manager_connect_console(Manager *m) {
897 struct epoll_event ev;
900 assert(m->console_active_fd < 0);
902 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
903 if (m->console_active_fd < 0) {
904 log_error("Failed to open /sys/class/tty/tty0/active: %m");
910 ev.data.u32 = FD_CONSOLE;
912 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
918 static int manager_connect_udev(Manager *m) {
919 struct epoll_event ev;
923 assert(!m->udev_seat_monitor);
924 assert(!m->udev_vcsa_monitor);
926 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
927 if (!m->udev_seat_monitor)
930 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
934 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
938 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
942 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
946 ev.data.u32 = FD_SEAT_UDEV;
948 if (m->n_autovts <= 0)
951 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
954 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
955 if (!m->udev_vcsa_monitor)
958 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
962 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
966 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
970 ev.data.u32 = FD_VCSA_UDEV;
972 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
978 void manager_gc(Manager *m, bool drop_not_started) {
985 while ((seat = m->seat_gc_queue)) {
986 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
987 seat->in_gc_queue = false;
989 if (seat_check_gc(seat, drop_not_started) == 0) {
995 while ((session = m->session_gc_queue)) {
996 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
997 session->in_gc_queue = false;
999 if (session_check_gc(session, drop_not_started) == 0) {
1000 session_stop(session);
1001 session_free(session);
1005 while ((user = m->user_gc_queue)) {
1006 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1007 user->in_gc_queue = false;
1009 if (user_check_gc(user, drop_not_started) == 0) {
1016 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1018 bool idle_hint = true;
1019 dual_timestamp ts = { 0, 0 };
1024 HASHMAP_FOREACH(s, m->sessions, i) {
1028 ih = session_get_idle_hint(s, &k);
1034 if (k.monotonic < ts.monotonic)
1040 } else if (idle_hint) {
1042 if (k.monotonic > ts.monotonic)
1053 int manager_startup(Manager *m) {
1061 assert(m->epoll_fd <= 0);
1063 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1064 if (m->epoll_fd < 0)
1067 /* Connect to udev */
1068 r = manager_connect_udev(m);
1072 /* Connect to console */
1073 r = manager_connect_console(m);
1077 /* Connect to the bus */
1078 r = manager_connect_bus(m);
1082 /* Instantiate magic seat 0 */
1083 r = manager_add_seat(m, "seat0", &m->vtconsole);
1087 /* Deserialize state */
1088 manager_enumerate_devices(m);
1089 manager_enumerate_seats(m);
1090 manager_enumerate_users(m);
1091 manager_enumerate_sessions(m);
1093 /* Remove stale objects before we start them */
1094 manager_gc(m, false);
1096 /* And start everything */
1097 HASHMAP_FOREACH(seat, m->seats, i)
1100 HASHMAP_FOREACH(user, m->users, i)
1103 HASHMAP_FOREACH(session, m->sessions, i)
1104 session_start(session);
1109 int manager_run(Manager *m) {
1113 struct epoll_event event;
1116 manager_gc(m, true);
1118 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1121 manager_gc(m, true);
1123 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1125 if (errno == EINTR || errno == EAGAIN)
1128 log_error("epoll() failed: %m");
1132 switch (event.data.u32) {
1135 manager_dispatch_seat_udev(m);
1139 manager_dispatch_vcsa_udev(m);
1143 manager_dispatch_console(m);
1147 bus_loop_dispatch(m->bus_fd);
1151 if (event.data.u32 >= FD_FIFO_BASE)
1152 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1159 static int manager_parse_config_file(Manager *m) {
1161 const ConfigItem items[] = {
1162 { "NAutoVTs", config_parse_unsigned, 0, &m->n_autovts, "Login" },
1163 { "KillUserProcesses", config_parse_bool, 0, &m->kill_user_processes, "Login" },
1164 { "KillOnlyUsers", config_parse_strv, 0, &m->kill_only_users, "Login" },
1165 { "KillExcludeUsers", config_parse_strv, 0, &m->kill_exclude_users, "Login" },
1166 { "Controllers", config_parse_strv, 0, &m->controllers, "Login" },
1167 { "ResetControllers", config_parse_strv, 0, &m->reset_controllers, "Login" },
1168 { NULL, NULL, 0, NULL, NULL }
1171 static const char * const sections[] = {
1182 fn = "/etc/systemd/systemd-logind.conf";
1183 f = fopen(fn, "re");
1185 if (errno == ENOENT)
1188 log_warning("Failed to open configuration file %s: %m", fn);
1192 r = config_parse(fn, f, sections, items, false, NULL);
1194 log_warning("Failed to parse configuration file: %s", strerror(-r));
1201 int main(int argc, char *argv[]) {
1205 log_set_target(LOG_TARGET_AUTO);
1206 log_parse_environment();
1210 log_error("This program takes no arguments.");
1219 log_error("Out of memory");
1224 manager_parse_config_file(m);
1226 r = manager_startup(m);
1228 log_error("Failed to fully start up daemon: %s", strerror(-r));
1238 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;