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Systemd/src/login/logind.c
Lennart Poettering 19befb2d5f sd-bus: introduce sd_bus_slot objects encapsulating callbacks or vtables attached to a bus connection 
This makes callback behaviour more like sd-event or sd-resolve, and
creates proper object for unregistering callbacks.

Taking the refernce to the slot is optional. If not taken life time of
the slot will be bound to the underlying bus object (or in the case of
an async call until the reply has been recieved).
2014-05-15 01:15:30 +02:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <libudev.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <linux/vt.h>
#include <sys/timerfd.h>
#include "sd-daemon.h"
#include "strv.h"
#include "conf-parser.h"
#include "mkdir.h"
#include "bus-util.h"
#include "bus-error.h"
#include "logind.h"
#include "udev-util.h"
Manager *manager_new(void) {
Manager *m;
int r;
m = new0(Manager, 1);
if (!m)
return NULL;
m->console_active_fd = -1;
m->reserve_vt_fd = -1;
m->n_autovts = 6;
m->reserve_vt = 6;
m->remove_ipc = true;
m->inhibit_delay_max = 5 * USEC_PER_SEC;
m->handle_power_key = HANDLE_POWEROFF;
m->handle_suspend_key = HANDLE_SUSPEND;
m->handle_hibernate_key = HANDLE_HIBERNATE;
m->handle_lid_switch = HANDLE_SUSPEND;
m->lid_switch_ignore_inhibited = true;
m->idle_action_usec = 30 * USEC_PER_MINUTE;
m->idle_action = HANDLE_IGNORE;
m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
m->runtime_dir_size = PAGE_ALIGN((size_t) (physical_memory() / 10)); /* 10% */
m->devices = hashmap_new(string_hash_func, string_compare_func);
m->seats = hashmap_new(string_hash_func, string_compare_func);
m->sessions = hashmap_new(string_hash_func, string_compare_func);
m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
m->inhibitors = hashmap_new(string_hash_func, string_compare_func);
m->buttons = hashmap_new(string_hash_func, string_compare_func);
m->user_units = hashmap_new(string_hash_func, string_compare_func);
m->session_units = hashmap_new(string_hash_func, string_compare_func);
m->busnames = set_new(string_hash_func, string_compare_func);
if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || !m->busnames ||
!m->user_units || !m->session_units)
goto fail;
m->kill_exclude_users = strv_new("root", NULL);
if (!m->kill_exclude_users)
goto fail;
m->udev = udev_new();
if (!m->udev)
goto fail;
r = sd_event_default(&m->event);
if (r < 0)
goto fail;
sd_event_set_watchdog(m->event, true);
return m;
fail:
manager_free(m);
return NULL;
}
void manager_free(Manager *m) {
Session *session;
User *u;
Device *d;
Seat *s;
Inhibitor *i;
Button *b;
assert(m);
while ((session = hashmap_first(m->sessions)))
session_free(session);
while ((u = hashmap_first(m->users)))
user_free(u);
while ((d = hashmap_first(m->devices)))
device_free(d);
while ((s = hashmap_first(m->seats)))
seat_free(s);
while ((i = hashmap_first(m->inhibitors)))
inhibitor_free(i);
while ((b = hashmap_first(m->buttons)))
button_free(b);
hashmap_free(m->devices);
hashmap_free(m->seats);
hashmap_free(m->sessions);
hashmap_free(m->users);
hashmap_free(m->inhibitors);
hashmap_free(m->buttons);
hashmap_free(m->user_units);
hashmap_free(m->session_units);
set_free_free(m->busnames);
sd_event_source_unref(m->idle_action_event_source);
sd_event_source_unref(m->console_active_event_source);
sd_event_source_unref(m->udev_seat_event_source);
sd_event_source_unref(m->udev_device_event_source);
sd_event_source_unref(m->udev_vcsa_event_source);
sd_event_source_unref(m->udev_button_event_source);
sd_event_source_unref(m->lid_switch_ignore_event_source);
safe_close(m->console_active_fd);
if (m->udev_seat_monitor)
udev_monitor_unref(m->udev_seat_monitor);
if (m->udev_device_monitor)
udev_monitor_unref(m->udev_device_monitor);
if (m->udev_vcsa_monitor)
udev_monitor_unref(m->udev_vcsa_monitor);
if (m->udev_button_monitor)
udev_monitor_unref(m->udev_button_monitor);
if (m->udev)
udev_unref(m->udev);
bus_verify_polkit_async_registry_free(m->bus, m->polkit_registry);
sd_bus_unref(m->bus);
sd_event_unref(m->event);
safe_close(m->reserve_vt_fd);
strv_free(m->kill_only_users);
strv_free(m->kill_exclude_users);
free(m->action_job);
free(m);
}
static int manager_enumerate_devices(Manager *m) {
struct udev_list_entry *item = NULL, *first = NULL;
_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
int r;
assert(m);
/* Loads devices from udev and creates seats for them as
* necessary */
e = udev_enumerate_new(m->udev);
if (!e)
return -ENOMEM;
r = udev_enumerate_add_match_tag(e, "master-of-seat");
if (r < 0)
return r;
r = udev_enumerate_add_match_is_initialized(e);
if (r < 0)
return r;
r = udev_enumerate_scan_devices(e);
if (r < 0)
return r;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
int k;
d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
if (!d)
return -ENOMEM;
k = manager_process_seat_device(m, d);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_buttons(Manager *m) {
_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
int r;
assert(m);
/* Loads buttons from udev */
if (m->handle_power_key == HANDLE_IGNORE &&
m->handle_suspend_key == HANDLE_IGNORE &&
m->handle_hibernate_key == HANDLE_IGNORE &&
m->handle_lid_switch == HANDLE_IGNORE)
return 0;
e = udev_enumerate_new(m->udev);
if (!e)
return -ENOMEM;
r = udev_enumerate_add_match_subsystem(e, "input");
if (r < 0)
return r;
r = udev_enumerate_add_match_tag(e, "power-switch");
if (r < 0)
return r;
r = udev_enumerate_add_match_is_initialized(e);
if (r < 0)
return r;
r = udev_enumerate_scan_devices(e);
if (r < 0)
return r;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
int k;
d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
if (!d)
return -ENOMEM;
k = manager_process_button_device(m, d);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_seats(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
/* This loads data about seats stored on disk, but does not
* actually create any seats. Removes data of seats that no
* longer exist. */
d = opendir("/run/systemd/seats");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/seats: %m");
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
Seat *s;
int k;
if (!dirent_is_file(de))
continue;
s = hashmap_get(m->seats, de->d_name);
if (!s) {
unlinkat(dirfd(d), de->d_name, 0);
continue;
}
k = seat_load(s);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_linger_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
d = opendir("/var/lib/systemd/linger");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /var/lib/systemd/linger/: %m");
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
int k;
if (!dirent_is_file(de))
continue;
k = manager_add_user_by_name(m, de->d_name, NULL);
if (k < 0) {
log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
r = k;
}
}
return r;
}
static int manager_enumerate_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r, k;
assert(m);
/* Add lingering users */
r = manager_enumerate_linger_users(m);
/* Read in user data stored on disk */
d = opendir("/run/systemd/users");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/users: %m");
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
User *u;
if (!dirent_is_file(de))
continue;
k = manager_add_user_by_name(m, de->d_name, &u);
if (k < 0) {
log_error("Failed to add user by file name %s: %s", de->d_name, strerror(-k));
r = k;
continue;
}
user_add_to_gc_queue(u);
k = user_load(u);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_sessions(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
/* Read in session data stored on disk */
d = opendir("/run/systemd/sessions");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/sessions: %m");
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
struct Session *s;
int k;
if (!dirent_is_file(de))
continue;
if (!session_id_valid(de->d_name)) {
log_warning("Invalid session file name '%s', ignoring.", de->d_name);
r = -EINVAL;
continue;
}
k = manager_add_session(m, de->d_name, &s);
if (k < 0) {
log_error("Failed to add session by file name %s: %s", de->d_name, strerror(-k));
r = k;
continue;
}
session_add_to_gc_queue(s);
k = session_load(s);
if (k < 0)
r = k;
}
return r;
}
static int manager_enumerate_inhibitors(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(m);
d = opendir("/run/systemd/inhibit");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/inhibit: %m");
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
int k;
Inhibitor *i;
if (!dirent_is_file(de))
continue;
k = manager_add_inhibitor(m, de->d_name, &i);
if (k < 0) {
log_notice("Couldn't add inhibitor %s: %s", de->d_name, strerror(-k));
r = k;
continue;
}
k = inhibitor_load(i);
if (k < 0)
r = k;
}
return r;
}
static int manager_dispatch_seat_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
Manager *m = userdata;
assert(m);
d = udev_monitor_receive_device(m->udev_seat_monitor);
if (!d)
return -ENOMEM;
manager_process_seat_device(m, d);
return 0;
}
static int manager_dispatch_device_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
Manager *m = userdata;
assert(m);
d = udev_monitor_receive_device(m->udev_device_monitor);
if (!d)
return -ENOMEM;
manager_process_seat_device(m, d);
return 0;
}
static int manager_dispatch_vcsa_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
Manager *m = userdata;
const char *name;
assert(m);
d = udev_monitor_receive_device(m->udev_vcsa_monitor);
if (!d)
return -ENOMEM;
name = udev_device_get_sysname(d);
/* Whenever a VCSA device is removed try to reallocate our
* VTs, to make sure our auto VTs never go away. */
if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
seat_preallocate_vts(m->seat0);
return 0;
}
static int manager_dispatch_button_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
Manager *m = userdata;
assert(m);
d = udev_monitor_receive_device(m->udev_button_monitor);
if (!d)
return -ENOMEM;
manager_process_button_device(m, d);
return 0;
}
static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
Manager *m = userdata;
assert(m);
assert(m->seat0);
assert(m->console_active_fd == fd);
seat_read_active_vt(m->seat0);
return 0;
}
static int manager_reserve_vt(Manager *m) {
_cleanup_free_ char *p = NULL;
assert(m);
if (m->reserve_vt <= 0)
return 0;
if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
return log_oom();
m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (m->reserve_vt_fd < 0) {
/* Don't complain on VT-less systems */
if (errno != ENOENT)
log_warning("Failed to pin reserved VT: %m");
return -errno;
}
return 0;
}
static int manager_connect_bus(Manager *m) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(m);
assert(!m->bus);
r = sd_bus_default_system(&m->bus);
if (r < 0) {
log_error("Failed to connect to system bus: %s", strerror(-r));
return r;
}
r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", manager_vtable, m);
if (r < 0) {
log_error("Failed to add manager object vtable: %s", strerror(-r));
return r;
}
r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/seat", "org.freedesktop.login1.Seat", seat_vtable, seat_object_find, m);
if (r < 0) {
log_error("Failed to add seat object vtable: %s", strerror(-r));
return r;
}
r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/seat", seat_node_enumerator, m);
if (r < 0) {
log_error("Failed to add seat enumerator: %s", strerror(-r));
return r;
}
r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/session", "org.freedesktop.login1.Session", session_vtable, session_object_find, m);
if (r < 0) {
log_error("Failed to add session object vtable: %s", strerror(-r));
return r;
}
r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/session", session_node_enumerator, m);
if (r < 0) {
log_error("Failed to add session enumerator: %s", strerror(-r));
return r;
}
r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/user", "org.freedesktop.login1.User", user_vtable, user_object_find, m);
if (r < 0) {
log_error("Failed to add user object vtable: %s", strerror(-r));
return r;
}
r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/user", user_node_enumerator, m);
if (r < 0) {
log_error("Failed to add user enumerator: %s", strerror(-r));
return r;
}
r = sd_bus_add_match(m->bus,
NULL,
"type='signal',"
"sender='org.freedesktop.DBus',"
"interface='org.freedesktop.DBus',"
"member='NameOwnerChanged',"
"path='/org/freedesktop/DBus'",
match_name_owner_changed, m);
if (r < 0) {
log_error("Failed to add match for NameOwnerChanged: %s", strerror(-r));
return r;
}
r = sd_bus_add_match(m->bus,
NULL,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Manager',"
"member='JobRemoved',"
"path='/org/freedesktop/systemd1'",
match_job_removed, m);
if (r < 0) {
log_error("Failed to add match for JobRemoved: %s", strerror(-r));
return r;
}
r = sd_bus_add_match(m->bus,
NULL,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Manager',"
"member='UnitRemoved',"
"path='/org/freedesktop/systemd1'",
match_unit_removed, m);
if (r < 0) {
log_error("Failed to add match for UnitRemoved: %s", strerror(-r));
return r;
}
r = sd_bus_add_match(m->bus,
NULL,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.DBus.Properties',"
"member='PropertiesChanged'",
match_properties_changed, m);
if (r < 0) {
log_error("Failed to add match for PropertiesChanged: %s", strerror(-r));
return r;
}
r = sd_bus_add_match(m->bus,
NULL,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Manager',"
"member='Reloading',"
"path='/org/freedesktop/systemd1'",
match_reloading, m);
if (r < 0) {
log_error("Failed to add match for Reloading: %s", strerror(-r));
return r;
}
r = sd_bus_call_method(
m->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"Subscribe",
&error,
NULL, NULL);
if (r < 0) {
log_error("Failed to enable subscription: %s", bus_error_message(&error, r));
return r;
}
r = sd_bus_request_name(m->bus, "org.freedesktop.login1", 0);
if (r < 0) {
log_error("Failed to register name: %s", strerror(-r));
return r;
}
r = sd_bus_attach_event(m->bus, m->event, 0);
if (r < 0) {
log_error("Failed to attach bus to event loop: %s", strerror(-r));
return r;
}
return 0;
}
static int manager_connect_console(Manager *m) {
int r;
assert(m);
assert(m->console_active_fd < 0);
/* On certain architectures (S390 and Xen, and containers),
/dev/tty0 does not exist, so don't fail if we can't open
it. */
if (access("/dev/tty0", F_OK) < 0)
return 0;
m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (m->console_active_fd < 0) {
/* On some systems the device node /dev/tty0 may exist
* even though /sys/class/tty/tty0 does not. */
if (errno == ENOENT)
return 0;
log_error("Failed to open /sys/class/tty/tty0/active: %m");
return -errno;
}
r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
if (r < 0) {
log_error("Failed to watch foreground console");
return r;
}
return 0;
}
static int manager_connect_udev(Manager *m) {
int r;
assert(m);
assert(!m->udev_seat_monitor);
assert(!m->udev_device_monitor);
assert(!m->udev_vcsa_monitor);
assert(!m->udev_button_monitor);
m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_seat_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat");
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_seat_monitor);
if (r < 0)
return r;
r = sd_event_add_io(m->event, &m->udev_seat_event_source, udev_monitor_get_fd(m->udev_seat_monitor), EPOLLIN, manager_dispatch_seat_udev, m);
if (r < 0)
return r;
m->udev_device_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_device_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "input", NULL);
if (r < 0)
return r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "graphics", NULL);
if (r < 0)
return r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "drm", NULL);
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_device_monitor);
if (r < 0)
return r;
r = sd_event_add_io(m->event, &m->udev_device_event_source, udev_monitor_get_fd(m->udev_device_monitor), EPOLLIN, manager_dispatch_device_udev, m);
if (r < 0)
return r;
/* Don't watch keys if nobody cares */
if (m->handle_power_key != HANDLE_IGNORE ||
m->handle_suspend_key != HANDLE_IGNORE ||
m->handle_hibernate_key != HANDLE_IGNORE ||
m->handle_lid_switch != HANDLE_IGNORE) {
m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_button_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch");
if (r < 0)
return r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL);
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_button_monitor);
if (r < 0)
return r;
r = sd_event_add_io(m->event, &m->udev_button_event_source, udev_monitor_get_fd(m->udev_button_monitor), EPOLLIN, manager_dispatch_button_udev, m);
if (r < 0)
return r;
}
/* Don't bother watching VCSA devices, if nobody cares */
if (m->n_autovts > 0 && m->console_active_fd >= 0) {
m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_vcsa_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
if (r < 0)
return r;
r = sd_event_add_io(m->event, &m->udev_vcsa_event_source, udev_monitor_get_fd(m->udev_vcsa_monitor), EPOLLIN, manager_dispatch_vcsa_udev, m);
if (r < 0)
return r;
}
return 0;
}
void manager_gc(Manager *m, bool drop_not_started) {
Seat *seat;
Session *session;
User *user;
assert(m);
while ((seat = m->seat_gc_queue)) {
LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
seat->in_gc_queue = false;
if (!seat_check_gc(seat, drop_not_started)) {
seat_stop(seat, false);
seat_free(seat);
}
}
while ((session = m->session_gc_queue)) {
LIST_REMOVE(gc_queue, m->session_gc_queue, session);
session->in_gc_queue = false;
/* First, if we are not closing yet, initiate stopping */
if (!session_check_gc(session, drop_not_started) &&
session_get_state(session) != SESSION_CLOSING)
session_stop(session, false);
/* Normally, this should make the session busy again,
* if it doesn't then let's get rid of it
* immediately */
if (!session_check_gc(session, drop_not_started)) {
session_finalize(session);
session_free(session);
}
}
while ((user = m->user_gc_queue)) {
LIST_REMOVE(gc_queue, m->user_gc_queue, user);
user->in_gc_queue = false;
/* First step: queue stop jobs */
if (!user_check_gc(user, drop_not_started))
user_stop(user, false);
/* Second step: finalize user */
if (!user_check_gc(user, drop_not_started)) {
user_finalize(user);
user_free(user);
}
}
}
static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
Manager *m = userdata;
struct dual_timestamp since;
usec_t n, elapse;
int r;
assert(m);
if (m->idle_action == HANDLE_IGNORE ||
m->idle_action_usec <= 0)
return 0;
n = now(CLOCK_MONOTONIC);
r = manager_get_idle_hint(m, &since);
if (r <= 0)
/* Not idle. Let's check if after a timeout it might be idle then. */
elapse = n + m->idle_action_usec;
else {
/* Idle! Let's see if it's time to do something, or if
* we shall sleep for longer. */
if (n >= since.monotonic + m->idle_action_usec &&
(m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
log_info("System idle. Taking action.");
manager_handle_action(m, 0, m->idle_action, false, false);
m->idle_action_not_before_usec = n;
}
elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
}
if (!m->idle_action_event_source) {
r = sd_event_add_time(
m->event,
&m->idle_action_event_source,
CLOCK_MONOTONIC,
elapse, USEC_PER_SEC*30,
manager_dispatch_idle_action, m);
if (r < 0) {
log_error("Failed to add idle event source: %s", strerror(-r));
return r;
}
r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
if (r < 0) {
log_error("Failed to set idle event source priority: %s", strerror(-r));
return r;
}
} else {
r = sd_event_source_set_time(m->idle_action_event_source, elapse);
if (r < 0) {
log_error("Failed to set idle event timer: %s", strerror(-r));
return r;
}
r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
if (r < 0) {
log_error("Failed to enable idle event timer: %s", strerror(-r));
return r;
}
}
return 0;
}
int manager_startup(Manager *m) {
int r;
Seat *seat;
Session *session;
User *user;
Button *button;
Inhibitor *inhibitor;
Iterator i;
assert(m);
/* Connect to console */
r = manager_connect_console(m);
if (r < 0)
return r;
/* Connect to udev */
r = manager_connect_udev(m);
if (r < 0) {
log_error("Failed to create udev watchers: %s", strerror(-r));
return r;
}
/* Connect to the bus */
r = manager_connect_bus(m);
if (r < 0)
return r;
/* Instantiate magic seat 0 */
r = manager_add_seat(m, "seat0", &m->seat0);
if (r < 0) {
log_error("Failed to add seat0: %s", strerror(-r));
return r;
}
r = manager_set_lid_switch_ignore(m, 0 + IGNORE_LID_SWITCH_STARTUP_USEC);
if (r < 0)
log_warning("Failed to set up lid switch ignore event source: %s", strerror(-r));
/* Deserialize state */
r = manager_enumerate_devices(m);
if (r < 0)
log_warning("Device enumeration failed: %s", strerror(-r));
r = manager_enumerate_seats(m);
if (r < 0)
log_warning("Seat enumeration failed: %s", strerror(-r));
r = manager_enumerate_users(m);
if (r < 0)
log_warning("User enumeration failed: %s", strerror(-r));
r = manager_enumerate_sessions(m);
if (r < 0)
log_warning("Session enumeration failed: %s", strerror(-r));
r = manager_enumerate_inhibitors(m);
if (r < 0)
log_warning("Inhibitor enumeration failed: %s", strerror(-r));
r = manager_enumerate_buttons(m);
if (r < 0)
log_warning("Button enumeration failed: %s", strerror(-r));
/* Remove stale objects before we start them */
manager_gc(m, false);
/* Reserve the special reserved VT */
manager_reserve_vt(m);
/* And start everything */
HASHMAP_FOREACH(seat, m->seats, i)
seat_start(seat);
HASHMAP_FOREACH(user, m->users, i)
user_start(user);
HASHMAP_FOREACH(session, m->sessions, i)
session_start(session);
HASHMAP_FOREACH(inhibitor, m->inhibitors, i)
inhibitor_start(inhibitor);
HASHMAP_FOREACH(button, m->buttons, i)
button_check_switches(button);
manager_dispatch_idle_action(NULL, 0, m);
return 0;
}
int manager_run(Manager *m) {
int r;
assert(m);
for (;;) {
usec_t us = (uint64_t) -1;
r = sd_event_get_state(m->event);
if (r < 0)
return r;
if (r == SD_EVENT_FINISHED)
return 0;
manager_gc(m, true);
if (manager_dispatch_delayed(m) > 0)
continue;
if (m->action_what != 0 && !m->action_job) {
usec_t x, y;
x = now(CLOCK_MONOTONIC);
y = m->action_timestamp + m->inhibit_delay_max;
us = x >= y ? 0 : y - x;
}
r = sd_event_run(m->event, us);
if (r < 0)
return r;
}
}
static int manager_parse_config_file(Manager *m) {
static const char fn[] = "/etc/systemd/logind.conf";
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(m);
f = fopen(fn, "re");
if (!f) {
if (errno == ENOENT)
return 0;
log_warning("Failed to open configuration file %s: %m", fn);
return -errno;
}
r = config_parse(NULL, fn, f, "Login\0", config_item_perf_lookup,
(void*) logind_gperf_lookup, false, false, m);
if (r < 0)
log_warning("Failed to parse configuration file: %s", strerror(-r));
return r;
}
int main(int argc, char *argv[]) {
Manager *m = NULL;
int r;
log_set_target(LOG_TARGET_AUTO);
log_set_facility(LOG_AUTH);
log_parse_environment();
log_open();
umask(0022);
if (argc != 1) {
log_error("This program takes no arguments.");
r = -EINVAL;
goto finish;
}
/* Always create the directories people can create inotify
* watches in. Note that some applications might check for the
* existence of /run/systemd/seats/ to determine whether
* logind is available, so please always make sure this check
* stays in. */
mkdir_label("/run/systemd/seats", 0755);
mkdir_label("/run/systemd/users", 0755);
mkdir_label("/run/systemd/sessions", 0755);
m = manager_new();
if (!m) {
r = log_oom();
goto finish;
}
manager_parse_config_file(m);
r = manager_startup(m);
if (r < 0) {
log_error("Failed to fully start up daemon: %s", strerror(-r));
goto finish;
}
log_debug("systemd-logind running as pid %lu", (unsigned long) getpid());
sd_notify(false,
"READY=1\n"
"STATUS=Processing requests...");
r = manager_run(m);
log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid());
finish:
sd_notify(false,
"STATUS=Shutting down...");
if (m)
manager_free(m);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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