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Diffstat (limited to 'src/core/target.c')
| -rw-r--r-- | src/core/target.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/core/target.c b/src/core/target.c new file mode 100644 index 0000000000..6c1e0c368a --- /dev/null +++ b/src/core/target.c @@ -0,0 +1,224 @@ +/*-*- 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 <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_BIND_TO + }; + + 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) + if ((r = unit_add_default_target_dependency(other, UNIT(t))) < 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); + + 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->load_state == UNIT_LOADED) { + if (u->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", + .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 +}; |