1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 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 "load-fragment.h"
30 #include "dbus-target.h"
32 #include "unit-name.h"
34 static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
35 [TARGET_DEAD] = UNIT_INACTIVE,
36 [TARGET_ACTIVE] = UNIT_ACTIVE
39 static void target_set_state(Target *t, TargetState state) {
40 TargetState old_state;
46 if (state != old_state)
47 log_debug("%s changed %s -> %s",
49 target_state_to_string(old_state),
50 target_state_to_string(state));
52 unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
55 static int target_add_default_dependencies(Target *t) {
62 /* Imply ordering for requirement dependencies on target
63 * units. Note that when the user created a contradicting
64 * ordering manually we won't add anything in here to make
65 * sure we don't create a loop. */
67 SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES], i)
68 if ((r = unit_add_default_target_dependency(other, UNIT(t))) < 0)
71 SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
72 if ((r = unit_add_default_target_dependency(other, UNIT(t))) < 0)
75 SET_FOREACH(other, t->meta.dependencies[UNIT_WANTS], i)
76 if ((r = unit_add_default_target_dependency(other, UNIT(t))) < 0)
79 /* Make sure targets are unloaded on shutdown */
80 return unit_add_dependency_by_name(UNIT(t), UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
83 static int target_add_getty_dependencies(Target *t) {
89 if (!unit_has_name(UNIT(t), SPECIAL_GETTY_TARGET))
92 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
96 if ((tty = strrchr(active, ' ')))
101 /* Automatically add in a serial getty on the kernel
103 if (!tty_is_vc(tty)) {
105 /* We assume that gettys on virtual terminals are
106 * started via manual configuration and do this magic
107 * only for non-VC terminals. */
109 log_debug("Automatically adding serial getty for /dev/%s", tty);
110 if (!(n = unit_name_replace_instance(SPECIAL_SERIAL_GETTY_SERVICE, tty))) {
115 r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_WANTS, n, NULL, true);
127 /* Automatically add in a serial getty on the first
128 * virtualizer console */
129 if (access("/sys/class/tty/hvc0", F_OK) == 0) {
130 log_debug("Automatic adding serial getty for hvc0");
131 if (!(n = unit_name_replace_instance(SPECIAL_SERIAL_GETTY_SERVICE, "hvc0")))
134 r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_WANTS, n, NULL, true);
144 static int target_load(Unit *u) {
145 Target *t = TARGET(u);
150 if ((r = unit_load_fragment_and_dropin(u)) < 0)
153 /* This is a new unit? Then let's add in some extras */
154 if (u->meta.load_state == UNIT_LOADED) {
155 if (u->meta.default_dependencies)
156 if ((r = target_add_default_dependencies(t)) < 0)
159 if ((r = target_add_getty_dependencies(t)) < 0)
166 static int target_coldplug(Unit *u) {
167 Target *t = TARGET(u);
170 assert(t->state == TARGET_DEAD);
172 if (t->deserialized_state != t->state)
173 target_set_state(t, t->deserialized_state);
178 static void target_dump(Unit *u, FILE *f, const char *prefix) {
179 Target *t = TARGET(u);
185 "%sTarget State: %s\n",
186 prefix, target_state_to_string(t->state));
189 static int target_start(Unit *u) {
190 Target *t = TARGET(u);
193 assert(t->state == TARGET_DEAD);
195 target_set_state(t, TARGET_ACTIVE);
199 static int target_stop(Unit *u) {
200 Target *t = TARGET(u);
203 assert(t->state == TARGET_ACTIVE);
205 target_set_state(t, TARGET_DEAD);
209 static int target_serialize(Unit *u, FILE *f, FDSet *fds) {
210 Target *s = TARGET(u);
216 unit_serialize_item(u, f, "state", target_state_to_string(s->state));
220 static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
221 Target *s = TARGET(u);
228 if (streq(key, "state")) {
231 if ((state = target_state_from_string(value)) < 0)
232 log_debug("Failed to parse state value %s", value);
234 s->deserialized_state = state;
237 log_debug("Unknown serialization key '%s'", key);
242 static UnitActiveState target_active_state(Unit *u) {
245 return state_translation_table[TARGET(u)->state];
248 static const char *target_sub_state_to_string(Unit *u) {
251 return target_state_to_string(TARGET(u)->state);
254 static const char* const target_state_table[_TARGET_STATE_MAX] = {
255 [TARGET_DEAD] = "dead",
256 [TARGET_ACTIVE] = "active"
259 DEFINE_STRING_TABLE_LOOKUP(target_state, TargetState);
261 const UnitVTable target_vtable = {
265 .coldplug = target_coldplug,
269 .start = target_start,
272 .serialize = target_serialize,
273 .deserialize_item = target_deserialize_item,
275 .active_state = target_active_state,
276 .sub_state_to_string = target_sub_state_to_string,
278 .bus_interface = "org.freedesktop.systemd1.Target",
279 .bus_message_handler = bus_target_message_handler