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"
42 Manager *manager_new(void) {
49 m->console_active_fd = -1;
55 m->devices = hashmap_new(string_hash_func, string_compare_func);
56 m->seats = hashmap_new(string_hash_func, string_compare_func);
57 m->sessions = hashmap_new(string_hash_func, string_compare_func);
58 m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
59 m->cgroups = hashmap_new(string_hash_func, string_compare_func);
61 if (!m->devices || !m->seats || !m->sessions || !m->users) {
72 if (cg_get_user_path(&m->cgroup_path) < 0) {
80 void manager_free(Manager *m) {
88 while ((session = hashmap_first(m->sessions)))
89 session_free(session);
91 while ((u = hashmap_first(m->users)))
94 while ((d = hashmap_first(m->devices)))
97 while ((s = hashmap_first(m->seats)))
100 hashmap_free(m->sessions);
101 hashmap_free(m->users);
102 hashmap_free(m->devices);
103 hashmap_free(m->seats);
104 hashmap_free(m->cgroups);
106 if (m->console_active_fd >= 0)
107 close_nointr_nofail(m->console_active_fd);
110 udev_monitor_unref(m->udev_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_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_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_udev(Manager *m) {
629 struct udev_device *d;
634 d = udev_monitor_receive_device(m->udev_monitor);
638 r = manager_process_device(m, d);
639 udev_device_unref(d);
644 int manager_dispatch_console(Manager *m) {
648 seat_read_active_vt(m->vtconsole);
653 static int vt_is_busy(int vtnr) {
654 struct vt_stat vt_stat;
659 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
663 if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
666 r = !!(vt_stat.v_state & (1 << vtnr));
668 close_nointr_nofail(fd);
673 int manager_spawn_autovt(Manager *m, int vtnr) {
678 r = vt_is_busy(vtnr);
687 void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
696 log_error("Out of memory.");
703 if (isempty(p) || streq(p, "/"))
706 s = hashmap_get(m->cgroups, p);
708 session_add_to_gc_queue(s);
710 assert_se(e = strrchr(p, '/'));
717 static int manager_connect_bus(Manager *m) {
720 struct epoll_event ev;
724 assert(m->bus_fd < 0);
726 dbus_error_init(&error);
728 m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
730 log_error("Failed to get system D-Bus connection: %s", error.message);
735 if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
736 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
737 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
738 !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
739 !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
740 log_error("Not enough memory");
745 dbus_bus_add_match(m->bus,
747 "interface='org.freedesktop.systemd1.Agent',"
749 "path='/org/freedesktop/systemd1/agent'",
752 if (dbus_error_is_set(&error)) {
753 log_error("Failed to register match: %s", error.message);
758 if (dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) {
759 log_error("Failed to register name on bus: %s", error.message);
764 m->bus_fd = bus_loop_open(m->bus);
772 ev.data.u32 = FD_BUS;
774 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
780 dbus_error_free(&error);
785 static int manager_connect_console(Manager *m) {
786 struct epoll_event ev;
789 assert(m->console_active_fd < 0);
791 m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
792 if (m->console_active_fd < 0) {
793 log_error("Failed to open /sys/class/tty/tty0/active: %m");
799 ev.data.u32 = FD_CONSOLE;
801 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
807 static int manager_connect_udev(Manager *m) {
808 struct epoll_event ev;
812 assert(!m->udev_monitor);
814 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
815 if (!m->udev_monitor)
818 r = udev_monitor_filter_add_match_tag(m->udev_monitor, "seat");
822 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "graphics", NULL);
826 r = udev_monitor_enable_receiving(m->udev_monitor);
830 m->udev_fd = udev_monitor_get_fd(m->udev_monitor);
834 ev.data.u32 = FD_UDEV;
836 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_fd, &ev) < 0)
842 void manager_gc(Manager *m) {
849 while ((seat = m->seat_gc_queue)) {
850 LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
851 seat->in_gc_queue = false;
853 if (seat_check_gc(seat) == 0) {
859 while ((session = m->session_gc_queue)) {
860 LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
861 session->in_gc_queue = false;
863 if (session_check_gc(session) == 0) {
864 session_stop(session);
865 session_free(session);
869 while ((user = m->user_gc_queue)) {
870 LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
871 user->in_gc_queue = false;
873 if (user_check_gc(user) == 0) {
880 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
882 bool idle_hint = true;
883 dual_timestamp ts = { 0, 0 };
888 HASHMAP_FOREACH(s, m->sessions, i) {
892 ih = session_get_idle_hint(s, &k);
898 if (k.monotonic < ts.monotonic)
904 } else if (idle_hint) {
906 if (k.monotonic > ts.monotonic)
917 int manager_startup(Manager *m) {
925 assert(m->epoll_fd <= 0);
927 m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
931 /* Connect to udev */
932 r = manager_connect_udev(m);
936 /* Connect to console */
937 r = manager_connect_console(m);
941 /* Connect to the bus */
942 r = manager_connect_bus(m);
946 /* Instantiate magic seat 0 */
947 r = manager_add_seat(m, "seat0", &m->vtconsole);
951 /* Deserialize state */
952 manager_enumerate_devices(m);
953 manager_enumerate_seats(m);
954 manager_enumerate_users(m);
955 manager_enumerate_sessions(m);
957 /* Get rid of objects that are no longer used */
960 /* And start everything */
961 HASHMAP_FOREACH(seat, m->seats, i)
964 HASHMAP_FOREACH(user, m->users, i)
967 HASHMAP_FOREACH(session, m->sessions, i)
968 session_start(session);
973 int manager_run(Manager *m) {
977 struct epoll_event event;
982 if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
987 n = epoll_wait(m->epoll_fd, &event, 1, -1);
989 if (errno == EINTR || errno == EAGAIN)
992 log_error("epoll() failed: %m");
996 switch (event.data.u32) {
999 manager_dispatch_udev(m);
1003 manager_dispatch_console(m);
1007 bus_loop_dispatch(m->bus_fd);
1015 int main(int argc, char *argv[]) {
1019 log_set_target(LOG_TARGET_AUTO);
1020 log_parse_environment();
1024 log_error("This program takes no arguments.");
1033 log_error("Out of memory");
1038 r = manager_startup(m);
1040 log_error("Failed to fully start up daemon: %s", strerror(-r));
1050 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;