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;
49 m->devices = hashmap_new(string_hash_func, string_compare_func);
50 m->seats = hashmap_new(string_hash_func, string_compare_func);
51 m->sessions = hashmap_new(string_hash_func, string_compare_func);
52 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
53 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
54 m->pipe_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
56 if (!m->devices || !m->seats || !m->sessions || !m->users) {
67 if (cg_get_user_path(&m->cgroup_path) < 0) {
75 void manager_free(Manager *m) {
83 while ((session = hashmap_first(m->sessions)))
84 session_free(session);
86 while ((u = hashmap_first(m->users)))
89 while ((d = hashmap_first(m->devices)))
92 while ((s = hashmap_first(m->seats)))
95 hashmap_free(m->sessions);
96 hashmap_free(m->users);
97 hashmap_free(m->devices);
98 hashmap_free(m->seats);
99 hashmap_free(m->cgroups);
100 hashmap_free(m->pipe_fds);
102 if (m->console_active_fd >= 0)
103 close_nointr_nofail(m->console_active_fd);
106 udev_monitor_unref(m->udev_monitor);
112 dbus_connection_flush(m->bus);
113 dbus_connection_close(m->bus);
114 dbus_connection_unref(m->bus);
118 close_nointr_nofail(m->bus_fd);
120 if (m->epoll_fd >= 0)
121 close_nointr_nofail(m->epoll_fd);
123 free(m->cgroup_path);
127 int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
133 d = hashmap_get(m->devices, sysfs);
141 d = device_new(m, sysfs);
151 int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
157 s = hashmap_get(m->seats, id);
175 int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
181 s = hashmap_get(m->sessions, id);
189 s = session_new(m, u, id);
199 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
205 u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
213 u = user_new(m, uid, gid, name);
223 int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
232 return errno ? -errno : -ENOENT;
234 return manager_add_user(m, p->pw_uid, p->pw_gid, name, _user);
237 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
245 return errno ? -errno : -ENOENT;
247 return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
250 int manager_process_device(Manager *m, struct udev_device *d) {
256 /* FIXME: drop this check as soon as libudev's enum support
257 * honours tags and subsystem matches at the same time */
258 if (!streq_ptr(udev_device_get_subsystem(d), "graphics"))
261 if (streq_ptr(udev_device_get_action(d), "remove")) {
263 /* FIXME: use syspath instead of sysname here, as soon as fb driver is fixed */
264 device = hashmap_get(m->devices, udev_device_get_sysname(d));
268 seat_add_to_gc_queue(device->seat);
275 sn = udev_device_get_property_value(d, "ID_SEAT");
279 if (!seat_name_is_valid(sn)) {
280 log_warning("Device with invalid seat name %s found, ignoring.", sn);
284 r = manager_add_device(m, udev_device_get_sysname(d), &device);
288 r = manager_add_seat(m, sn, &seat);
296 device_attach(device, seat);
303 int manager_enumerate_devices(Manager *m) {
304 struct udev_list_entry *item = NULL, *first = NULL;
305 struct udev_enumerate *e;
310 /* Loads devices from udev and creates seats for them as
313 e = udev_enumerate_new(m->udev);
319 r = udev_enumerate_add_match_subsystem(e, "graphics");
323 r = udev_enumerate_add_match_tag(e, "seat");
327 r = udev_enumerate_scan_devices(e);
331 first = udev_enumerate_get_list_entry(e);
332 udev_list_entry_foreach(item, first) {
333 struct udev_device *d;
336 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
342 k = manager_process_device(m, d);
343 udev_device_unref(d);
351 udev_enumerate_unref(e);
356 int manager_enumerate_seats(Manager *m) {
363 /* This loads data about seats stored on disk, but does not
364 * actually create any seats. Removes data of seats that no
367 d = opendir("/run/systemd/seats");
372 log_error("Failed to open /run/systemd/seats: %m");
376 while ((de = readdir(d))) {
380 if (!dirent_is_file(de))
383 s = hashmap_get(m->seats, de->d_name);
385 unlinkat(dirfd(d), de->d_name, 0);
399 static int manager_enumerate_users_from_cgroup(Manager *m) {
404 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
409 log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
413 while ((r = cg_read_subgroup(d, &name)) > 0) {
417 k = manager_add_user_by_name(m, name, &user);
424 user_add_to_gc_queue(user);
426 if (!user->cgroup_path)
427 if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
442 static int manager_enumerate_linger_users(Manager *m) {
447 d = opendir("/var/lib/systemd/linger");
452 log_error("Failed to open /var/lib/systemd/linger/: %m");
456 while ((de = readdir(d))) {
459 if (!dirent_is_file(de))
462 k = manager_add_user_by_name(m, de->d_name, NULL);
464 log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
474 int manager_enumerate_users(Manager *m) {
481 /* First, enumerate user cgroups */
482 r = manager_enumerate_users_from_cgroup(m);
484 /* Second, add lingering users on top */
485 k = manager_enumerate_linger_users(m);
489 /* Third, read in user data stored on disk */
490 d = opendir("/run/systemd/users");
495 log_error("Failed to open /run/systemd/users: %m");
499 while ((de = readdir(d))) {
503 if (!dirent_is_file(de))
506 k = safe_atolu(de->d_name, &ul);
508 log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
512 u = hashmap_get(m->users, ULONG_TO_PTR(ul));
514 unlinkat(dirfd(d), de->d_name, 0);
528 static int manager_enumerate_sessions_from_cgroup(Manager *m) {
533 HASHMAP_FOREACH(u, m->users, i) {
541 k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
546 log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
551 while ((k = cg_read_subgroup(d, &name)) > 0) {
554 k = manager_add_session(m, u, name, &session);
560 session_add_to_gc_queue(session);
562 if (!session->cgroup_path)
563 if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
581 int manager_enumerate_sessions(Manager *m) {
588 /* First enumerate session cgroups */
589 r = manager_enumerate_sessions_from_cgroup(m);
591 /* Second, read in session data stored on disk */
592 d = opendir("/run/systemd/sessions");
597 log_error("Failed to open /run/systemd/sessions: %m");
601 while ((de = readdir(d))) {
605 if (!dirent_is_file(de))
608 s = hashmap_get(m->sessions, de->d_name);
610 unlinkat(dirfd(d), de->d_name, 0);
624 int manager_dispatch_udev(Manager *m) {
625 struct udev_device *d;
630 d = udev_monitor_receive_device(m->udev_monitor);
634 r = manager_process_device(m, d);
635 udev_device_unref(d);
640 int manager_dispatch_console(Manager *m) {
644 seat_read_active_vt(m->vtconsole);
649 static int vt_is_busy(int vtnr) {
650 struct vt_stat vt_stat;
655 /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
656 * we'd open the latter we'd open the foreground tty which
657 * hence would be unconditionally busy. By opening /dev/tty1
658 * we avoid this. Since tty1 is special and needs to be an
659 * explicitly loaded getty or DM this is safe. */
661 fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
665 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
668 r = !!(vt_stat.v_state & (1 << vtnr));
670 close_nointr_nofail(fd);
675 int manager_spawn_autovt(Manager *m, int vtnr) {
677 DBusMessage *message = NULL, *reply = NULL;
679 const char *mode = "fail";
684 dbus_error_init(&error);
686 if (vtnr > m->n_autovts)
689 r = vt_is_busy(vtnr);
695 message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
697 log_error("Could not allocate message.");
702 if (asprintf(&name, "autovt-getty@tty%i.service", vtnr) < 0) {
703 log_error("Could not allocate service name.");
708 if (!dbus_message_append_args(message,
709 DBUS_TYPE_STRING, &name,
710 DBUS_TYPE_STRING, &mode,
711 DBUS_TYPE_INVALID)) {
712 log_error("Could not attach target and flag information to message.");
717 reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
719 log_error("Failed to start unit: %s", bus_error_message(&error));
729 dbus_message_unref(message);
732 dbus_message_unref(reply);
734 dbus_error_free(&error);
739 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
748 log_error("Out of memory.");
755 if (isempty(p) || streq(p, "/"))
758 s = hashmap_get(m->cgroups, p);
760 session_add_to_gc_queue(s);
762 assert_se(e = strrchr(p, '/'));
769 static void manager_pipe_notify_eof(Manager *m, int fd) {
775 assert_se(s = hashmap_get(m->pipe_fds, INT_TO_PTR(fd + 1)));
776 assert(s->pipe_fd == fd);
777 session_unset_pipe_fd(s);
782 static int manager_connect_bus(Manager *m) {
785 struct epoll_event ev;
789 assert(m->bus_fd < 0);
791 dbus_error_init(&error);
793 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
795 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
800 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
801 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
802 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
803 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
804 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
805 log_error("Not enough memory");
810 dbus_bus_add_match(m->bus,
812 "interface='org.freedesktop.systemd1.Agent',"
814 "path='/org/freedesktop/systemd1/agent'",
817 if (dbus_error_is_set(&error)) {
818 log_error("Failed to register match: %s", bus_error_message(&error));
823 r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
824 if (dbus_error_is_set(&error)) {
825 log_error("Failed to register name on bus: %s", bus_error_message(&error));
830 if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
831 log_error("Failed to acquire name.");
836 m->bus_fd = bus_loop_open(m->bus);
844 ev.data.u32 = FD_BUS;
846 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
852 dbus_error_free(&error);
857 static int manager_connect_console(Manager *m) {
858 struct epoll_event ev;
861 assert(m->console_active_fd < 0);
863 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
864 if (m->console_active_fd < 0) {
865 log_error("Failed to open /sys/class/tty/tty0/active: %m");
871 ev.data.u32 = FD_CONSOLE;
873 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
879 static int manager_connect_udev(Manager *m) {
880 struct epoll_event ev;
884 assert(!m->udev_monitor);
886 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
887 if (!m->udev_monitor)
890 r = udev_monitor_filter_add_match_tag(m->udev_monitor, "seat");
894 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "graphics", NULL);
898 r = udev_monitor_enable_receiving(m->udev_monitor);
902 m->udev_fd = udev_monitor_get_fd(m->udev_monitor);
906 ev.data.u32 = FD_UDEV;
908 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_fd, &ev) < 0)
914 void manager_gc(Manager *m) {
921 while ((seat = m->seat_gc_queue)) {
922 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
923 seat->in_gc_queue = false;
925 if (seat_check_gc(seat) == 0) {
931 while ((session = m->session_gc_queue)) {
932 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
933 session->in_gc_queue = false;
935 if (session_check_gc(session) == 0) {
936 session_stop(session);
937 session_free(session);
941 while ((user = m->user_gc_queue)) {
942 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
943 user->in_gc_queue = false;
945 if (user_check_gc(user) == 0) {
952 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
954 bool idle_hint = true;
955 dual_timestamp ts = { 0, 0 };
960 HASHMAP_FOREACH(s, m->sessions, i) {
964 ih = session_get_idle_hint(s, &k);
970 if (k.monotonic < ts.monotonic)
976 } else if (idle_hint) {
978 if (k.monotonic > ts.monotonic)
989 int manager_startup(Manager *m) {
997 assert(m->epoll_fd <= 0);
999 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1000 if (m->epoll_fd < 0)
1003 /* Connect to udev */
1004 r = manager_connect_udev(m);
1008 /* Connect to console */
1009 r = manager_connect_console(m);
1013 /* Connect to the bus */
1014 r = manager_connect_bus(m);
1018 /* Instantiate magic seat 0 */
1019 r = manager_add_seat(m, "seat0", &m->vtconsole);
1023 /* Deserialize state */
1024 manager_enumerate_devices(m);
1025 manager_enumerate_seats(m);
1026 manager_enumerate_users(m);
1027 manager_enumerate_sessions(m);
1029 /* Get rid of objects that are no longer used */
1032 /* And start everything */
1033 HASHMAP_FOREACH(seat, m->seats, i)
1036 HASHMAP_FOREACH(user, m->users, i)
1039 HASHMAP_FOREACH(session, m->sessions, i)
1040 session_start(session);
1045 int manager_run(Manager *m) {
1049 struct epoll_event event;
1054 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
1059 n = epoll_wait(m->epoll_fd, &event, 1, -1);
1061 if (errno == EINTR || errno == EAGAIN)
1064 log_error("epoll() failed: %m");
1068 switch (event.data.u32) {
1071 manager_dispatch_udev(m);
1075 manager_dispatch_console(m);
1079 bus_loop_dispatch(m->bus_fd);
1083 if (event.data.u32 >= FD_PIPE_BASE)
1084 manager_pipe_notify_eof(m, event.data.u32 - FD_PIPE_BASE);
1091 int main(int argc, char *argv[]) {
1095 log_set_target(LOG_TARGET_AUTO);
1096 log_parse_environment();
1100 log_error("This program takes no arguments.");
1109 log_error("Out of memory");
1114 r = manager_startup(m);
1116 log_error("Failed to fully start up daemon: %s", strerror(-r));
1126 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;