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 Manager *manager_new(void) {
43 m->console_active_fd = -1;
50 m->devices = hashmap_new(string_hash_func, string_compare_func);
51 m->seats = hashmap_new(string_hash_func, string_compare_func);
52 m->sessions = hashmap_new(string_hash_func, string_compare_func);
53 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
54 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
55 m->pipe_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
57 if (!m->devices || !m->seats || !m->sessions || !m->users) {
68 if (cg_get_user_path(&m->cgroup_path) < 0) {
76 void manager_free(Manager *m) {
84 while ((session = hashmap_first(m->sessions)))
85 session_free(session);
87 while ((u = hashmap_first(m->users)))
90 while ((d = hashmap_first(m->devices)))
93 while ((s = hashmap_first(m->seats)))
96 hashmap_free(m->sessions);
97 hashmap_free(m->users);
98 hashmap_free(m->devices);
99 hashmap_free(m->seats);
100 hashmap_free(m->cgroups);
101 hashmap_free(m->pipe_fds);
103 if (m->console_active_fd >= 0)
104 close_nointr_nofail(m->console_active_fd);
106 if (m->udev_seat_monitor)
107 udev_monitor_unref(m->udev_seat_monitor);
109 if (m->udev_vcsa_monitor)
110 udev_monitor_unref(m->udev_vcsa_monitor);
116 dbus_connection_flush(m->bus);
117 dbus_connection_close(m->bus);
118 dbus_connection_unref(m->bus);
122 close_nointr_nofail(m->bus_fd);
124 if (m->epoll_fd >= 0)
125 close_nointr_nofail(m->epoll_fd);
127 free(m->cgroup_path);
131 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
137 d = hashmap_get(m->devices, sysfs);
145 d = device_new(m, sysfs);
155 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
161 s = hashmap_get(m->seats, id);
179 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
185 s = hashmap_get(m->sessions, id);
193 s = session_new(m, u, id);
203 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
209 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
217 u = user_new(m, uid, gid, name);
227 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
236 return errno ? -errno : -ENOENT;
238 return manager_add_user(m, p->pw_uid, p->pw_gid, name, _user);
241 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
249 return errno ? -errno : -ENOENT;
251 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
254 int manager_process_seat_device(Manager *m, struct udev_device *d) {
260 /* FIXME: drop this check as soon as libudev's enum support
261 * honours tags and subsystem matches at the same time */
262 if (!streq_ptr(udev_device_get_subsystem(d), "graphics"))
265 if (streq_ptr(udev_device_get_action(d), "remove")) {
267 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
268 device = hashmap_get(m->devices, udev_device_get_sysname(d));
272 seat_add_to_gc_queue(device->seat);
279 sn = udev_device_get_property_value(d, "ID_SEAT");
283 if (!seat_name_is_valid(sn)) {
284 log_warning("Device with invalid seat name %s found, ignoring.", sn);
288 r = manager_add_device(m, udev_device_get_sysname(d), &device);
292 r = manager_add_seat(m, sn, &seat);
300 device_attach(device, seat);
307 int manager_enumerate_devices(Manager *m) {
308 struct udev_list_entry *item = NULL, *first = NULL;
309 struct udev_enumerate *e;
314 /* Loads devices from udev and creates seats for them as
317 e = udev_enumerate_new(m->udev);
323 r = udev_enumerate_add_match_subsystem(e, "graphics");
327 r = udev_enumerate_add_match_tag(e, "seat");
331 r = udev_enumerate_scan_devices(e);
335 first = udev_enumerate_get_list_entry(e);
336 udev_list_entry_foreach(item, first) {
337 struct udev_device *d;
340 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
346 k = manager_process_seat_device(m, d);
347 udev_device_unref(d);
355 udev_enumerate_unref(e);
360 int manager_enumerate_seats(Manager *m) {
367 /* This loads data about seats stored on disk, but does not
368 * actually create any seats. Removes data of seats that no
371 d = opendir("/run/systemd/seats");
376 log_error("Failed to open /run/systemd/seats: %m");
380 while ((de = readdir(d))) {
384 if (!dirent_is_file(de))
387 s = hashmap_get(m->seats, de->d_name);
389 unlinkat(dirfd(d), de->d_name, 0);
403 static int manager_enumerate_users_from_cgroup(Manager *m) {
408 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
413 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
417 while ((r = cg_read_subgroup(d, &name)) > 0) {
421 k = manager_add_user_by_name(m, name, &user);
428 user_add_to_gc_queue(user);
430 if (!user->cgroup_path)
431 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
446 static int manager_enumerate_linger_users(Manager *m) {
451 d = opendir("/var/lib/systemd/linger");
456 log_error("Failed to open /var/lib/systemd/linger/: %m");
460 while ((de = readdir(d))) {
463 if (!dirent_is_file(de))
466 k = manager_add_user_by_name(m, de->d_name, NULL);
468 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
478 int manager_enumerate_users(Manager *m) {
485 /* First, enumerate user cgroups */
486 r = manager_enumerate_users_from_cgroup(m);
488 /* Second, add lingering users on top */
489 k = manager_enumerate_linger_users(m);
493 /* Third, read in user data stored on disk */
494 d = opendir("/run/systemd/users");
499 log_error("Failed to open /run/systemd/users: %m");
503 while ((de = readdir(d))) {
507 if (!dirent_is_file(de))
510 k = safe_atolu(de->d_name, &ul);
512 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
516 u = hashmap_get(m->users, ULONG_TO_PTR(ul));
518 unlinkat(dirfd(d), de->d_name, 0);
532 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
537 HASHMAP_FOREACH(u, m->users, i) {
545 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
550 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
555 while ((k = cg_read_subgroup(d, &name)) > 0) {
558 k = manager_add_session(m, u, name, &session);
564 session_add_to_gc_queue(session);
566 if (!session->cgroup_path)
567 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
585 int manager_enumerate_sessions(Manager *m) {
592 /* First enumerate session cgroups */
593 r = manager_enumerate_sessions_from_cgroup(m);
595 /* Second, read in session data stored on disk */
596 d = opendir("/run/systemd/sessions");
601 log_error("Failed to open /run/systemd/sessions: %m");
605 while ((de = readdir(d))) {
609 if (!dirent_is_file(de))
612 s = hashmap_get(m->sessions, de->d_name);
614 unlinkat(dirfd(d), de->d_name, 0);
628 int manager_dispatch_seat_udev(Manager *m) {
629 struct udev_device *d;
634 d = udev_monitor_receive_device(m->udev_seat_monitor);
638 r = manager_process_seat_device(m, d);
639 udev_device_unref(d);
645 int manager_dispatch_vcsa_udev(Manager *m) {
646 struct udev_device *d;
652 d = udev_monitor_receive_device(m->udev_vcsa_monitor);
656 name = udev_device_get_sysname(d);
658 /* Whenever a VCSA device is removed try to reallocate our
659 * VTs, to make sure our auto VTs never go away. */
661 if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
662 r = seat_preallocate_vts(m->vtconsole);
664 udev_device_unref(d);
669 int manager_dispatch_console(Manager *m) {
673 seat_read_active_vt(m->vtconsole);
678 static int vt_is_busy(int vtnr) {
679 struct vt_stat vt_stat;
684 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
685 * we'd open the latter we'd open the foreground tty which
686 * hence would be unconditionally busy. By opening /dev/tty1
687 * we avoid this. Since tty1 is special and needs to be an
688 * explicitly loaded getty or DM this is safe. */
690 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
694 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
697 r = !!(vt_stat.v_state & (1 << vtnr));
699 close_nointr_nofail(fd);
704 int manager_spawn_autovt(Manager *m, int vtnr) {
706 DBusMessage *message = NULL, *reply = NULL;
708 const char *mode = "fail";
714 dbus_error_init(&error);
716 if ((unsigned) vtnr > m->n_autovts)
719 r = vt_is_busy(vtnr);
725 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
727 log_error("Could not allocate message.");
732 if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
733 log_error("Could not allocate service name.");
738 if (!dbus_message_append_args(message,
739 DBUS_TYPE_STRING, &name,
740 DBUS_TYPE_STRING, &mode,
741 DBUS_TYPE_INVALID)) {
742 log_error("Could not attach target and flag information to message.");
747 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
749 log_error("Failed to start unit: %s", bus_error_message(&error));
759 dbus_message_unref(message);
762 dbus_message_unref(reply);
764 dbus_error_free(&error);
769 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
778 log_error("Out of memory.");
785 if (isempty(p) || streq(p, "/"))
788 s = hashmap_get(m->cgroups, p);
790 session_add_to_gc_queue(s);
792 assert_se(e = strrchr(p, '/'));
799 static void manager_pipe_notify_eof(Manager *m, int fd) {
805 assert_se(s = hashmap_get(m->pipe_fds, INT_TO_PTR(fd + 1)));
806 assert(s->pipe_fd == fd);
807 session_unset_pipe_fd(s);
812 static int manager_connect_bus(Manager *m) {
815 struct epoll_event ev;
819 assert(m->bus_fd < 0);
821 dbus_error_init(&error);
823 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
825 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
830 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
831 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
832 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
833 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
834 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
835 log_error("Not enough memory");
840 dbus_bus_add_match(m->bus,
842 "interface='org.freedesktop.systemd1.Agent',"
844 "path='/org/freedesktop/systemd1/agent'",
847 if (dbus_error_is_set(&error)) {
848 log_error("Failed to register match: %s", bus_error_message(&error));
853 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
854 if (dbus_error_is_set(&error)) {
855 log_error("Failed to register name on bus: %s", bus_error_message(&error));
860 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
861 log_error("Failed to acquire name.");
866 m->bus_fd = bus_loop_open(m->bus);
874 ev.data.u32 = FD_BUS;
876 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
882 dbus_error_free(&error);
887 static int manager_connect_console(Manager *m) {
888 struct epoll_event ev;
891 assert(m->console_active_fd < 0);
893 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
894 if (m->console_active_fd < 0) {
895 log_error("Failed to open /sys/class/tty/tty0/active: %m");
901 ev.data.u32 = FD_CONSOLE;
903 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
909 static int manager_connect_udev(Manager *m) {
910 struct epoll_event ev;
914 assert(!m->udev_seat_monitor);
915 assert(!m->udev_vcsa_monitor);
917 m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
918 if (!m->udev_seat_monitor)
921 r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat");
925 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
929 r = udev_monitor_enable_receiving(m->udev_seat_monitor);
933 m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
937 ev.data.u32 = FD_SEAT_UDEV;
939 if (m->n_autovts <= 0)
942 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
945 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
946 if (!m->udev_vcsa_monitor)
949 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
953 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
957 m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
961 ev.data.u32 = FD_VCSA_UDEV;
963 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
969 void manager_gc(Manager *m) {
976 while ((seat = m->seat_gc_queue)) {
977 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
978 seat->in_gc_queue = false;
980 if (seat_check_gc(seat) == 0) {
986 while ((session = m->session_gc_queue)) {
987 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
988 session->in_gc_queue = false;
990 if (session_check_gc(session) == 0) {
991 session_stop(session);
992 session_free(session);
996 while ((user = m->user_gc_queue)) {
997 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
998 user->in_gc_queue = false;
1000 if (user_check_gc(user) == 0) {
1007 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
1009 bool idle_hint = true;
1010 dual_timestamp ts = { 0, 0 };
1015 HASHMAP_FOREACH(s, m->sessions, i) {
1019 ih = session_get_idle_hint(s, &k);
1025 if (k.monotonic < ts.monotonic)
1031 } else if (idle_hint) {
1033 if (k.monotonic > ts.monotonic)
1044 int manager_startup(Manager *m) {
1052 assert(m->epoll_fd <= 0);
1054 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1055 if (m->epoll_fd < 0)
1058 /* Connect to udev */
1059 r = manager_connect_udev(m);
1063 /* Connect to console */
1064 r = manager_connect_console(m);
1068 /* Connect to the bus */
1069 r = manager_connect_bus(m);
1073 /* Instantiate magic seat 0 */
1074 r = manager_add_seat(m, "seat0", &m->vtconsole);
1078 /* Deserialize state */
1079 manager_enumerate_devices(m);
1080 manager_enumerate_seats(m);
1081 manager_enumerate_users(m);
1082 manager_enumerate_sessions(m);
1084 /* Get rid of objects that are no longer used */
1087 /* And start everything */
1088 HASHMAP_FOREACH(seat, m->seats, i)
1091 HASHMAP_FOREACH(user, m->users, i)
1094 HASHMAP_FOREACH(session, m->sessions, i)
1095 session_start(session);
1100 int manager_run(Manager *m) {
1104 struct epoll_event event;
1109 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1114 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1116 if (errno == EINTR || errno == EAGAIN)
1119 log_error("epoll() failed: %m");
1123 switch (event.data.u32) {
1126 manager_dispatch_seat_udev(m);
1130 manager_dispatch_vcsa_udev(m);
1134 manager_dispatch_console(m);
1138 bus_loop_dispatch(m->bus_fd);
1142 if (event.data.u32 >= FD_PIPE_BASE)
1143 manager_pipe_notify_eof(m, event.data.u32 - FD_PIPE_BASE);
1150 int main(int argc, char *argv[]) {
1154 log_set_target(LOG_TARGET_AUTO);
1155 log_parse_environment();
1159 log_error("This program takes no arguments.");
1168 log_error("Out of memory");
1173 r = manager_startup(m);
1175 log_error("Failed to fully start up daemon: %s", strerror(-r));
1185 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;