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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 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 <signal.h>
#include <unistd.h>
#include "unit.h"
#include "target.h"
#include "load-fragment.h"
#include "log.h"
#include "dbus-target.h"
#include "special.h"
#include "unit-name.h"
static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
[TARGET_DEAD] = UNIT_INACTIVE,
[TARGET_ACTIVE] = UNIT_ACTIVE
};
static void target_set_state(Target *t, TargetState state) {
TargetState old_state;
assert(t);
old_state = t->state;
t->state = state;
if (state != old_state)
log_debug("%s changed %s -> %s",
UNIT(t)->id,
target_state_to_string(old_state),
target_state_to_string(state));
unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
}
static int target_add_default_dependencies(Target *t) {
static const UnitDependency deps[] = {
UNIT_REQUIRES,
UNIT_REQUIRES_OVERRIDABLE,
UNIT_REQUISITE,
UNIT_REQUISITE_OVERRIDABLE,
UNIT_WANTS,
UNIT_BINDS_TO,
UNIT_PART_OF
};
Iterator i;
Unit *other;
int r;
unsigned k;
assert(t);
/* Imply ordering for requirement dependencies on target
* units. Note that when the user created a contradicting
* ordering manually we won't add anything in here to make
* sure we don't create a loop. */
for (k = 0; k < ELEMENTSOF(deps); k++)
SET_FOREACH(other, UNIT(t)->dependencies[deps[k]], i) {
r = unit_add_default_target_dependency(other, UNIT(t));
if (r < 0)
return r;
}
/* Make sure targets are unloaded on shutdown */
return unit_add_dependency_by_name(UNIT(t), UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int target_load(Unit *u) {
Target *t = TARGET(u);
int r;
assert(t);
r = unit_load_fragment_and_dropin(u);
if (r < 0)
return r;
/* This is a new unit? Then let's add in some extras */
if (u->load_state == UNIT_LOADED && u->default_dependencies) {
r = target_add_default_dependencies(t);
if (r < 0)
return r;
}
return 0;
}
static int target_coldplug(Unit *u) {
Target *t = TARGET(u);
assert(t);
assert(t->state == TARGET_DEAD);
if (t->deserialized_state != t->state)
target_set_state(t, t->deserialized_state);
return 0;
}
static void target_dump(Unit *u, FILE *f, const char *prefix) {
Target *t = TARGET(u);
assert(t);
assert(f);
fprintf(f,
"%sTarget State: %s\n",
prefix, target_state_to_string(t->state));
}
static int target_start(Unit *u) {
Target *t = TARGET(u);
assert(t);
assert(t->state == TARGET_DEAD);
target_set_state(t, TARGET_ACTIVE);
return 0;
}
static int target_stop(Unit *u) {
Target *t = TARGET(u);
assert(t);
assert(t->state == TARGET_ACTIVE);
target_set_state(t, TARGET_DEAD);
return 0;
}
static int target_serialize(Unit *u, FILE *f, FDSet *fds) {
Target *s = TARGET(u);
assert(s);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", target_state_to_string(s->state));
return 0;
}
static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Target *s = TARGET(u);
assert(u);
assert(key);
assert(value);
assert(fds);
if (streq(key, "state")) {
TargetState state;
state = target_state_from_string(value);
if (state < 0)
log_debug("Failed to parse state value %s", value);
else
s->deserialized_state = state;
} else
log_debug("Unknown serialization key '%s'", key);
return 0;
}
static UnitActiveState target_active_state(Unit *u) {
assert(u);
return state_translation_table[TARGET(u)->state];
}
static const char *target_sub_state_to_string(Unit *u) {
assert(u);
return target_state_to_string(TARGET(u)->state);
}
static const char* const target_state_table[_TARGET_STATE_MAX] = {
[TARGET_DEAD] = "dead",
[TARGET_ACTIVE] = "active"
};
DEFINE_STRING_TABLE_LOOKUP(target_state, TargetState);
const UnitVTable target_vtable = {
.object_size = sizeof(Target),
.sections =
"Unit\0"
"Target\0"
"Install\0",
.load = target_load,
.coldplug = target_coldplug,
.dump = target_dump,
.start = target_start,
.stop = target_stop,
.serialize = target_serialize,
.deserialize_item = target_deserialize_item,
.active_state = target_active_state,
.sub_state_to_string = target_sub_state_to_string,
.bus_interface = "org.freedesktop.systemd1.Target",
.bus_message_handler = bus_target_message_handler,
.status_message_formats = {
.finished_start_job = {
[JOB_DONE] = "Reached target %s.",
[JOB_DEPENDENCY] = "Dependency failed for %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Stopped target %s.",
},
},
};
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