/*-*- 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <signal.h> #include "unit.h" #include "target.h" #include "load-fragment.h" #include "log.h" #include "dbus-target.h" #include "special.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", t->meta.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]); } static int target_add_default_dependencies(Target *t) { Iterator i; Unit *other; int r; /* 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. */ SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES], i) if (!set_get(t->meta.dependencies[UNIT_BEFORE], other)) if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0) return r; SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i) if (!set_get(t->meta.dependencies[UNIT_BEFORE], other)) if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0) return r; SET_FOREACH(other, t->meta.dependencies[UNIT_WANTS], i) if (!set_get(t->meta.dependencies[UNIT_BEFORE], other)) if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0) return r; return 0; } static int target_load(Unit *u) { Target *t = TARGET(u); int r; assert(t); if ((r = unit_load_fragment_and_dropin(u)) < 0) return r; /* This is a new unit? Then let's add in some extras */ if (u->meta.load_state == UNIT_LOADED) { if (u->meta.default_dependencies) if ((r = target_add_default_dependencies(t)) < 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; if ((state = target_state_from_string(value)) < 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 = { .suffix = ".target", .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 };