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 device = hashmap_get(m->devices, udev_device_get_syspath(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_syspath(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) {
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 ((k = 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) {
457 static int manager_enumerate_linger_users(Manager *m) {
462 d = opendir("/var/lib/systemd/linger");
467 log_error("Failed to open /var/lib/systemd/linger/: %m");
471 while ((de = readdir(d))) {
474 if (!dirent_is_file(de))
477 k = manager_add_user_by_name(m, de->d_name, NULL);
479 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
489 int manager_enumerate_users(Manager *m) {
496 /* First, enumerate user cgroups */
497 r = manager_enumerate_users_from_cgroup(m);
499 /* Second, add lingering users on top */
500 k = manager_enumerate_linger_users(m);
504 /* Third, read in user data stored on disk */
505 d = opendir("/run/systemd/users");
510 log_error("Failed to open /run/systemd/users: %m");
514 while ((de = readdir(d))) {
518 if (!dirent_is_file(de))
521 k = parse_uid(de->d_name, &uid);
523 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
527 u = hashmap_get(m->users, ULONG_TO_PTR(uid));
529 unlinkat(dirfd(d), de->d_name, 0);
543 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
548 HASHMAP_FOREACH(u, m->users, i) {
556 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
561 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
566 while ((k = cg_read_subgroup(d, &name)) > 0) {
569 if (streq(name, "shared"))
572 k = manager_add_session(m, u, name, &session);
578 session_add_to_gc_queue(session);
580 if (!session->cgroup_path)
581 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
599 int manager_enumerate_sessions(Manager *m) {
606 /* First enumerate session cgroups */
607 r = manager_enumerate_sessions_from_cgroup(m);
609 /* Second, read in session data stored on disk */
610 d = opendir("/run/systemd/sessions");
615 log_error("Failed to open /run/systemd/sessions: %m");
619 while ((de = readdir(d))) {
623 if (!dirent_is_file(de))
626 s = hashmap_get(m->sessions, de->d_name);
628 unlinkat(dirfd(d), de->d_name, 0);
642 int manager_dispatch_seat_udev(Manager *m) {
643 struct udev_device *d;
648 d = udev_monitor_receive_device(m->udev_seat_monitor);
652 r = manager_process_seat_device(m, d);
653 udev_device_unref(d);
658 int manager_dispatch_vcsa_udev(Manager *m) {
659 struct udev_device *d;
665 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
669 name = udev_device_get_sysname(d);
671 /* Whenever a VCSA device is removed try to reallocate our
672 * VTs, to make sure our auto VTs never go away. */
674 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
675 r = seat_preallocate_vts(m->vtconsole);
677 udev_device_unref(d);
682 int manager_dispatch_console(Manager *m) {
686 seat_read_active_vt(m->vtconsole);
691 static int vt_is_busy(int vtnr) {
692 struct vt_stat vt_stat;
697 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
698 * we'd open the latter we'd open the foreground tty which
699 * hence would be unconditionally busy. By opening /dev/tty1
700 * we avoid this. Since tty1 is special and needs to be an
701 * explicitly loaded getty or DM this is safe. */
703 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
707 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
710 r = !!(vt_stat.v_state & (1 << vtnr));
712 close_nointr_nofail(fd);
717 int manager_spawn_autovt(Manager *m, int vtnr) {
719 DBusMessage *message = NULL, *reply = NULL;
721 const char *mode = "fail";
727 dbus_error_init(&error);
729 if ((unsigned) vtnr > m->n_autovts)
732 r = vt_is_busy(vtnr);
738 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
740 log_error("Could not allocate message.");
745 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
746 log_error("Could not allocate service name.");
751 if (!dbus_message_append_args(message,
752 DBUS_TYPE_STRING, &name,
753 DBUS_TYPE_STRING, &mode,
754 DBUS_TYPE_INVALID)) {
755 log_error("Could not attach target and flag information to message.");
760 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
762 log_error("Failed to start unit: %s", bus_error_message(&error));
772 dbus_message_unref(message);
775 dbus_message_unref(reply);
777 dbus_error_free(&error);
782 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
791 log_error("Out of memory.");
798 if (isempty(p) || streq(p, "/"))
801 s = hashmap_get(m->cgroups, p);
803 session_add_to_gc_queue(s);
805 assert_se(e = strrchr(p, '/'));
812 static void manager_pipe_notify_eof(Manager *m, int fd) {
818 assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
819 assert(s->fifo_fd == fd);
820 session_remove_fifo(s);
825 static int manager_connect_bus(Manager *m) {
828 struct epoll_event ev;
832 assert(m->bus_fd < 0);
834 dbus_error_init(&error);
836 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
838 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
843 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
844 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
845 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
846 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
847 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
848 log_error("Not enough memory");
853 dbus_bus_add_match(m->bus,
855 "interface='org.freedesktop.systemd1.Agent',"
857 "path='/org/freedesktop/systemd1/agent'",
860 if (dbus_error_is_set(&error)) {
861 log_error("Failed to register match: %s", bus_error_message(&error));
866 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
867 if (dbus_error_is_set(&error)) {
868 log_error("Failed to register name on bus: %s", bus_error_message(&error));
873 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
874 log_error("Failed to acquire name.");
879 m->bus_fd = bus_loop_open(m->bus);
887 ev.data.u32 = FD_BUS;
889 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
895 dbus_error_free(&error);
900 static int manager_connect_console(Manager *m) {
901 struct epoll_event ev;
904 assert(m->console_active_fd < 0);
906 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
907 if (m->console_active_fd < 0) {
909 /* On certain architectures (S390 and Xen), /dev/tty0
910 does not exist, so don't fail if we can't open it.*/
914 log_error("Failed to open /sys/class/tty/tty0/active: %m");
920 ev.data.u32 = FD_CONSOLE;
922 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
928 static int manager_connect_udev(Manager *m) {
929 struct epoll_event ev;
933 assert(!m->udev_seat_monitor);
934 assert(!m->udev_vcsa_monitor);
936 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
937 if (!m->udev_seat_monitor)
940 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
944 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
948 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
952 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
956 ev.data.u32 = FD_SEAT_UDEV;
958 /* Don't bother watching VCSA devices, if nobody cares */
959 if (m->n_autovts <= 0 || m->console_active_fd < 0)
962 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
965 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
966 if (!m->udev_vcsa_monitor)
969 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
973 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
977 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
981 ev.data.u32 = FD_VCSA_UDEV;
983 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
989 void manager_gc(Manager *m, bool drop_not_started) {
996 while ((seat = m->seat_gc_queue)) {
997 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
998 seat->in_gc_queue = false;
1000 if (seat_check_gc(seat, drop_not_started) == 0) {
1006 while ((session = m->session_gc_queue)) {
1007 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
1008 session->in_gc_queue = false;
1010 if (session_check_gc(session, drop_not_started) == 0) {
1011 session_stop(session);
1012 session_free(session);
1016 while ((user = m->user_gc_queue)) {
1017 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
1018 user->in_gc_queue = false;
1020 if (user_check_gc(user, drop_not_started) == 0) {
1027 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1029 bool idle_hint = true;
1030 dual_timestamp ts = { 0, 0 };
1035 HASHMAP_FOREACH(s, m->sessions, i) {
1039 ih = session_get_idle_hint(s, &k);
1045 if (k.monotonic < ts.monotonic)
1051 } else if (idle_hint) {
1053 if (k.monotonic > ts.monotonic)
1064 int manager_startup(Manager *m) {
1072 assert(m->epoll_fd <= 0);
1074 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1075 if (m->epoll_fd < 0)
1078 /* Connect to console */
1079 r = manager_connect_console(m);
1083 /* Connect to udev */
1084 r = manager_connect_udev(m);
1088 /* Connect to the bus */
1089 r = manager_connect_bus(m);
1093 /* Instantiate magic seat 0 */
1094 r = manager_add_seat(m, "seat0", &m->vtconsole);
1098 /* Deserialize state */
1099 manager_enumerate_devices(m);
1100 manager_enumerate_seats(m);
1101 manager_enumerate_users(m);
1102 manager_enumerate_sessions(m);
1104 /* Remove stale objects before we start them */
1105 manager_gc(m, false);
1107 /* And start everything */
1108 HASHMAP_FOREACH(seat, m->seats, i)
1111 HASHMAP_FOREACH(user, m->users, i)
1114 HASHMAP_FOREACH(session, m->sessions, i)
1115 session_start(session);
1120 int manager_run(Manager *m) {
1124 struct epoll_event event;
1127 manager_gc(m, true);
1129 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1132 manager_gc(m, true);
1134 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1136 if (errno == EINTR || errno == EAGAIN)
1139 log_error("epoll() failed: %m");
1143 switch (event.data.u32) {
1146 manager_dispatch_seat_udev(m);
1150 manager_dispatch_vcsa_udev(m);
1154 manager_dispatch_console(m);
1158 bus_loop_dispatch(m->bus_fd);
1162 if (event.data.u32 >= FD_FIFO_BASE)
1163 manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
1170 static int manager_parse_config_file(Manager *m) {
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, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
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();
1207 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;