[thirdparty/systemd.git] / src / timer.c

/*-*- Mode: C; c-basic-offset: 8 -*-*/

/***
  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 "unit.h"
#include "unit-name.h"
#include "timer.h"
#include "dbus-timer.h"

static const UnitActiveState state_translation_table[_TIMER_STATE_MAX] = {
        [TIMER_DEAD] = UNIT_INACTIVE,
        [TIMER_WAITING] = UNIT_ACTIVE,
        [TIMER_RUNNING] = UNIT_ACTIVE,
        [TIMER_ELAPSED] = UNIT_ACTIVE,
        [TIMER_MAINTAINANCE] = UNIT_INACTIVE
};

static void timer_init(Unit *u) {
        Timer *t = TIMER(u);

        assert(u);
        assert(u->meta.load_state == UNIT_STUB);

        t->next_elapse = (usec_t) -1;
}

static void timer_done(Unit *u) {
        Timer *t = TIMER(u);
        TimerValue *v;

        assert(t);

        while ((v = t->values)) {
                LIST_REMOVE(TimerValue, value, t->values, v);
                free(v);
        }

        unit_unwatch_timer(u, &t->timer_watch);
}

static int timer_verify(Timer *t) {
        assert(t);

        if (UNIT(t)->meta.load_state != UNIT_LOADED)
                return 0;

        if (!t->values) {
                log_error("%s lacks value setting. Refusing.", t->meta.id);
                return -EINVAL;
        }

        return 0;
}

static int timer_load(Unit *u) {
        Timer *t = TIMER(u);
        int r;

        assert(u);
        assert(u->meta.load_state == UNIT_STUB);

        if ((r = unit_load_fragment_and_dropin(u)) < 0)
                return r;

        if (u->meta.load_state == UNIT_LOADED) {

                if (!t->unit)
                        if ((r = unit_load_related_unit(u, ".service", &t->unit)))
                                return r;

                if ((r = unit_add_dependency(u, UNIT_BEFORE, t->unit, true)) < 0)
                        return r;
        }

        return timer_verify(t);
}

static void timer_dump(Unit *u, FILE *f, const char *prefix) {
        Timer *t = TIMER(u);
        const char *prefix2;
        char *p2;
        TimerValue *v;
        char
                timespan1[FORMAT_TIMESPAN_MAX];

        p2 = strappend(prefix, "\t");
        prefix2 = p2 ? p2 : prefix;

        fprintf(f,
                "%sTimer State: %s\n"
                "%sUnit: %s\n",
                prefix, timer_state_to_string(t->state),
                prefix, t->unit->meta.id);

        LIST_FOREACH(value, v, t->values)
                fprintf(f,
                        "%s%s: %s\n",
                        prefix,
                        timer_base_to_string(v->base),
                        strna(format_timespan(timespan1, sizeof(timespan1), v->value)));

        free(p2);
}

static void timer_set_state(Timer *t, TimerState state) {
        TimerState old_state;
        assert(t);

        old_state = t->state;
        t->state = state;

        if (state != TIMER_WAITING)
                unit_unwatch_timer(UNIT(t), &t->timer_watch);

        if (state != old_state)
                log_debug("%s changed %s -> %s",
                          t->meta.id,
                          timer_state_to_string(old_state),
                          timer_state_to_string(state));

        unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
}

static void timer_enter_waiting(Timer *t, bool initial);

static int timer_coldplug(Unit *u) {
        Timer *t = TIMER(u);

        assert(t);
        assert(t->state == TIMER_DEAD);

        if (t->deserialized_state != t->state) {

                if (t->deserialized_state == TIMER_WAITING ||
                    t->deserialized_state == TIMER_RUNNING ||
                    t->deserialized_state == TIMER_ELAPSED)
                        timer_enter_waiting(t, false);
                else
                        timer_set_state(t, t->deserialized_state);
        }

        return 0;
}

static void timer_enter_dead(Timer *t, bool success) {
        assert(t);

        if (!success)
                t->failure = true;

        timer_set_state(t, t->failure ? TIMER_MAINTAINANCE : TIMER_DEAD);
}

static void timer_enter_waiting(Timer *t, bool initial) {
        TimerValue *v;
        usec_t base = 0, delay, n;
        bool found = false;
        int r;

        n = now(CLOCK_MONOTONIC);

        LIST_FOREACH(value, v, t->values) {

                if (v->disabled)
                        continue;

                switch (v->base) {

                case TIMER_ACTIVE:
                        if (state_translation_table[t->state] == UNIT_ACTIVE) {
                                base = t->meta.inactive_exit_timestamp.monotonic;
                        } else
                                base = n;
                        break;

                case TIMER_BOOT:
                        /* CLOCK_MONOTONIC equals the uptime on Linux */
                        base = 0;
                        break;

                case TIMER_STARTUP:
                        base = t->meta.manager->startup_timestamp.monotonic;
                        break;

                case TIMER_UNIT_ACTIVE:

                        if (t->unit->meta.inactive_exit_timestamp.monotonic <= 0)
                                continue;

                        base = t->unit->meta.inactive_exit_timestamp.monotonic;
                        break;

                case TIMER_UNIT_INACTIVE:

                        if (t->unit->meta.inactive_enter_timestamp.monotonic <= 0)
                                continue;

                        base = t->unit->meta.inactive_enter_timestamp.monotonic;
                        break;

                default:
                        assert_not_reached("Unknown timer base");
                }

                v->next_elapse = base + v->value;

                if (!initial && v->next_elapse < n) {
                        v->disabled = true;
                        continue;
                }

                if (!found)
                        t->next_elapse = v->next_elapse;
                else
                        t->next_elapse = MIN(t->next_elapse, v->next_elapse);

                found = true;
        }

        if (!found) {
                timer_set_state(t, TIMER_ELAPSED);
                return;
        }

        delay = n < t->next_elapse ? t->next_elapse - n : 0;

        if ((r = unit_watch_timer(UNIT(t), delay, &t->timer_watch)) < 0)
                goto fail;

        timer_set_state(t, TIMER_WAITING);
        return;

fail:
        log_warning("%s failed to enter waiting state: %s", t->meta.id, strerror(-r));
        timer_enter_dead(t, false);
}

static void timer_enter_running(Timer *t) {
        int r;
        assert(t);

        if ((r = manager_add_job(UNIT(t)->meta.manager, JOB_START, t->unit, JOB_REPLACE, true, NULL)) < 0)
                goto fail;

        timer_set_state(t, TIMER_RUNNING);
        return;

fail:
        log_warning("%s failed to queue unit startup job: %s", t->meta.id, strerror(-r));
        timer_enter_dead(t, false);
}

static int timer_start(Unit *u) {
        Timer *t = TIMER(u);

        assert(t);
        assert(t->state == TIMER_DEAD || t->state == TIMER_MAINTAINANCE);

        if (t->unit->meta.load_state != UNIT_LOADED)
                return -ENOENT;

        t->failure = false;
        timer_enter_waiting(t, true);
        return 0;
}

static int timer_stop(Unit *u) {
        Timer *t = TIMER(u);

        assert(t);
        assert(t->state == TIMER_WAITING || t->state == TIMER_RUNNING || t->state == TIMER_ELAPSED);

        timer_enter_dead(t, true);
        return 0;
}

static int timer_serialize(Unit *u, FILE *f, FDSet *fds) {
        Timer *t = TIMER(u);

        assert(u);
        assert(f);
        assert(fds);

        unit_serialize_item(u, f, "state", timer_state_to_string(t->state));

        return 0;
}

static int timer_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
        Timer *t = TIMER(u);

        assert(u);
        assert(key);
        assert(value);
        assert(fds);

        if (streq(key, "state")) {
                TimerState state;

                if ((state = timer_state_from_string(value)) < 0)
                        log_debug("Failed to parse state value %s", value);
                else
                        t->deserialized_state = state;
        } else
                log_debug("Unknown serialization key '%s'", key);

        return 0;
}

static UnitActiveState timer_active_state(Unit *u) {
        assert(u);

        return state_translation_table[TIMER(u)->state];
}

static const char *timer_sub_state_to_string(Unit *u) {
        assert(u);

        return timer_state_to_string(TIMER(u)->state);
}

static void timer_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
        Timer *t = TIMER(u);

        assert(t);
        assert(elapsed == 1);

        if (t->state != TIMER_WAITING)
                return;

        log_debug("Timer elapsed on %s", u->meta.id);
        timer_enter_running(t);
}

void timer_unit_notify(Unit *u, UnitActiveState new_state) {
        char *n;
        int r;
        Iterator i;

        if (u->meta.type == UNIT_TIMER)
                return;

        SET_FOREACH(n, u->meta.names, i) {
                char *k;
                Unit *p;
                Timer *t;
                TimerValue *v;

                if (!(k = unit_name_change_suffix(n, ".timer"))) {
                        r = -ENOMEM;
                        goto fail;
                }

                p = manager_get_unit(u->meta.manager, k);
                free(k);

                if (!p)
                        continue;

                if (p->meta.load_state != UNIT_LOADED)
                        continue;

                t = TIMER(p);

                if (t->unit != u)
                        continue;

                /* Reenable all timers that depend on unit state */
                LIST_FOREACH(value, v, t->values)
                        if (v->base == TIMER_UNIT_ACTIVE ||
                            v->base == TIMER_UNIT_INACTIVE)
                                v->disabled = false;

                switch (t->state) {

                case TIMER_WAITING:
                case TIMER_ELAPSED:

                        /* Recalculate sleep time */
                        timer_enter_waiting(t, false);
                        break;

                case TIMER_RUNNING:

                        if (new_state == UNIT_INACTIVE) {
                                log_debug("%s got notified about unit deactivation.", t->meta.id);
                                timer_enter_waiting(t, false);
                        }

                        break;

                case TIMER_DEAD:
                case TIMER_MAINTAINANCE:
                        ;

                default:
                        assert_not_reached("Unknown timer state");
                }
        }

        return;

fail:
        log_error("Failed find timer unit: %s", strerror(-r));
}

static const char* const timer_state_table[_TIMER_STATE_MAX] = {
        [TIMER_DEAD] = "dead",
        [TIMER_WAITING] = "waiting",
        [TIMER_RUNNING] = "running",
        [TIMER_ELAPSED] = "elapsed",
        [TIMER_MAINTAINANCE] = "maintainance"
};

DEFINE_STRING_TABLE_LOOKUP(timer_state, TimerState);

static const char* const timer_base_table[_TIMER_BASE_MAX] = {
        [TIMER_ACTIVE] = "OnActive",
        [TIMER_BOOT] = "OnBoot",
        [TIMER_STARTUP] = "OnStartup",
        [TIMER_UNIT_ACTIVE] = "OnUnitActive",
        [TIMER_UNIT_INACTIVE] = "OnUnitInactive"
};

DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);

const UnitVTable timer_vtable = {
        .suffix = ".timer",

        .init = timer_init,
        .done = timer_done,
        .load = timer_load,

        .coldplug = timer_coldplug,

        .dump = timer_dump,

        .start = timer_start,
        .stop = timer_stop,

        .serialize = timer_serialize,
        .deserialize_item = timer_deserialize_item,

        .active_state = timer_active_state,
        .sub_state_to_string = timer_sub_state_to_string,

        .timer_event = timer_timer_event,

        .bus_message_handler = bus_timer_message_handler
};
Commit	Line	Data
5cb5a6ff LP	1	/-- Mode: C; c-basic-offset: 8 --/
5cb5a6ff LP	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	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.
	12
	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.
	17
	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/>.
	20	***/
	21
d46de8a1 LP	22	#include <errno.h>
d46de8a1 LP	23
87f0e418	24	#include "unit.h"
871d7de4	25	#include "unit-name.h"
5cb5a6ff	26	#include "timer.h"
871d7de4 LP	27	#include "dbus-timer.h"
	28
	29	static const UnitActiveState state_translation_table[_TIMER_STATE_MAX] = {
	30	[TIMER_DEAD] = UNIT_INACTIVE,
	31	[TIMER_WAITING] = UNIT_ACTIVE,
	32	[TIMER_RUNNING] = UNIT_ACTIVE,
	33	[TIMER_ELAPSED] = UNIT_ACTIVE,
	34	[TIMER_MAINTAINANCE] = UNIT_INACTIVE
	35	};
	36
	37	static void timer_init(Unit *u) {
	38	Timer *t = TIMER(u);
	39
	40	assert(u);
	41	assert(u->meta.load_state == UNIT_STUB);
	42
	43	t->next_elapse = (usec_t) -1;
871d7de4	44	}
5cb5a6ff	45
87f0e418 LP	46	static void timer_done(Unit *u) {
87f0e418 LP	47	Timer *t = TIMER(u);
871d7de4 LP	48	TimerValue *v;
	49
	50	assert(t);
	51
	52	while ((v = t->values)) {
	53	LIST_REMOVE(TimerValue, value, t->values, v);
	54	free(v);
	55	}
	56
	57	unit_unwatch_timer(u, &t->timer_watch);
	58	}
	59
	60	static int timer_verify(Timer *t) {
	61	assert(t);
	62
	63	if (UNIT(t)->meta.load_state != UNIT_LOADED)
	64	return 0;
	65
	66	if (!t->values) {
	67	log_error("%s lacks value setting. Refusing.", t->meta.id);
	68	return -EINVAL;
	69	}
	70
	71	return 0;
	72	}
	73
	74	static int timer_load(Unit *u) {
	75	Timer *t = TIMER(u);
	76	int r;
	77
	78	assert(u);
	79	assert(u->meta.load_state == UNIT_STUB);
	80
	81	if ((r = unit_load_fragment_and_dropin(u)) < 0)
	82	return r;
	83
	84	if (u->meta.load_state == UNIT_LOADED) {
	85
	86	if (!t->unit)
	87	if ((r = unit_load_related_unit(u, ".service", &t->unit)))
	88	return r;
	89
	90	if ((r = unit_add_dependency(u, UNIT_BEFORE, t->unit, true)) < 0)
	91	return r;
	92	}
	93
	94	return timer_verify(t);
	95	}
	96
	97	static void timer_dump(Unit u, FILE f, const char *prefix) {
	98	Timer *t = TIMER(u);
	99	const char *prefix2;
	100	char *p2;
	101	TimerValue *v;
	102	char
	103	timespan1[FORMAT_TIMESPAN_MAX];
034c6ed7	104
871d7de4 LP	105	p2 = strappend(prefix, "\t");
	106	prefix2 = p2 ? p2 : prefix;
	107
	108	fprintf(f,
	109	"%sTimer State: %s\n"
	110	"%sUnit: %s\n",
	111	prefix, timer_state_to_string(t->state),
	112	prefix, t->unit->meta.id);
	113
	114	LIST_FOREACH(value, v, t->values)
	115	fprintf(f,
	116	"%s%s: %s\n",
	117	prefix,
	118	timer_base_to_string(v->base),
	119	strna(format_timespan(timespan1, sizeof(timespan1), v->value)));
	120
	121	free(p2);
	122	}
	123
	124	static void timer_set_state(Timer *t, TimerState state) {
	125	TimerState old_state;
034c6ed7	126	assert(t);
871d7de4 LP	127
	128	old_state = t->state;
	129	t->state = state;
	130
	131	if (state != TIMER_WAITING)
	132	unit_unwatch_timer(UNIT(t), &t->timer_watch);
	133
	134	if (state != old_state)
	135	log_debug("%s changed %s -> %s",
	136	t->meta.id,
	137	timer_state_to_string(old_state),
	138	timer_state_to_string(state));
	139
	140	unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state]);
	141	}
	142
	143	static void timer_enter_waiting(Timer *t, bool initial);
	144
	145	static int timer_coldplug(Unit *u) {
	146	Timer *t = TIMER(u);
	147
	148	assert(t);
	149	assert(t->state == TIMER_DEAD);
	150
	151	if (t->deserialized_state != t->state) {
	152
	153	if (t->deserialized_state == TIMER_WAITING \|\|
	154	t->deserialized_state == TIMER_RUNNING \|\|
	155	t->deserialized_state == TIMER_ELAPSED)
	156	timer_enter_waiting(t, false);
	157	else
	158	timer_set_state(t, t->deserialized_state);
	159	}
	160
	161	return 0;
	162	}
	163
	164	static void timer_enter_dead(Timer *t, bool success) {
	165	assert(t);
	166
	167	if (!success)
	168	t->failure = true;
	169
	170	timer_set_state(t, t->failure ? TIMER_MAINTAINANCE : TIMER_DEAD);
	171	}
	172
	173	static void timer_enter_waiting(Timer *t, bool initial) {
	174	TimerValue *v;
	175	usec_t base = 0, delay, n;
	176	bool found = false;
	177	int r;
	178
	179	n = now(CLOCK_MONOTONIC);
	180
	181	LIST_FOREACH(value, v, t->values) {
	182
	183	if (v->disabled)
	184	continue;
	185
	186	switch (v->base) {
	187
	188	case TIMER_ACTIVE:
	189	if (state_translation_table[t->state] == UNIT_ACTIVE) {
	190	base = t->meta.inactive_exit_timestamp.monotonic;
191	} else
192	base = n;
193	break;
194
195	case TIMER_BOOT:
196	/* CLOCK_MONOTONIC equals the uptime on Linux */
197	base = 0;
198	break;
199
200	case TIMER_STARTUP:
201	base = t->meta.manager->startup_timestamp.monotonic;
202	break;
203
204	case TIMER_UNIT_ACTIVE:
205
206	if (t->unit->meta.inactive_exit_timestamp.monotonic <= 0)
207	continue;
208
209	base = t->unit->meta.inactive_exit_timestamp.monotonic;
210	break;
211
212	case TIMER_UNIT_INACTIVE:
213
214	if (t->unit->meta.inactive_enter_timestamp.monotonic <= 0)
215	continue;
216
217	base = t->unit->meta.inactive_enter_timestamp.monotonic;
218	break;
219
220	default:
221	assert_not_reached("Unknown timer base");
222	}
223
224	v->next_elapse = base + v->value;
225
226	if (!initial && v->next_elapse < n) {
227	v->disabled = true;
228	continue;
229	}
230
231	if (!found)
232	t->next_elapse = v->next_elapse;
233	else
234	t->next_elapse = MIN(t->next_elapse, v->next_elapse);
235
236	found = true;
237	}
238
239	if (!found) {
240	timer_set_state(t, TIMER_ELAPSED);
241	return;
242	}
243
244	delay = n < t->next_elapse ? t->next_elapse - n : 0;
245
246	if ((r = unit_watch_timer(UNIT(t), delay, &t->timer_watch)) < 0)
247	goto fail;
248
249	timer_set_state(t, TIMER_WAITING);
250	return;
251
252	fail:
253	log_warning("%s failed to enter waiting state: %s", t->meta.id, strerror(-r));
254	timer_enter_dead(t, false);
255	}
256
257	static void timer_enter_running(Timer *t) {
258	int r;
259	assert(t);
260
261	if ((r = manager_add_job(UNIT(t)->meta.manager, JOB_START, t->unit, JOB_REPLACE, true, NULL)) < 0)
262	goto fail;
263
264	timer_set_state(t, TIMER_RUNNING);
265	return;
266
267	fail:
268	log_warning("%s failed to queue unit startup job: %s", t->meta.id, strerror(-r));
269	timer_enter_dead(t, false);
270	}
271
272	static int timer_start(Unit *u) {
273	Timer *t = TIMER(u);
274
275	assert(t);
01f78473 LP	276	assert(t->state == TIMER_DEAD \|\| t->state == TIMER_MAINTAINANCE);
	277
	278	if (t->unit->meta.load_state != UNIT_LOADED)
	279	return -ENOENT;
871d7de4	280
01f78473	281	t->failure = false;
871d7de4 LP	282	timer_enter_waiting(t, true);
	283	return 0;
	284	}
	285
	286	static int timer_stop(Unit *u) {
	287	Timer *t = TIMER(u);
	288
	289	assert(t);
	290	assert(t->state == TIMER_WAITING \|\| t->state == TIMER_RUNNING \|\| t->state == TIMER_ELAPSED);
	291
	292	timer_enter_dead(t, true);
	293	return 0;
	294	}
	295
	296	static int timer_serialize(Unit u, FILE f, FDSet *fds) {
	297	Timer *t = TIMER(u);
	298
	299	assert(u);
	300	assert(f);
	301	assert(fds);
	302
	303	unit_serialize_item(u, f, "state", timer_state_to_string(t->state));
	304
	305	return 0;
	306	}
	307
	308	static int timer_deserialize_item(Unit u, const char key, const char value, FDSet fds) {
	309	Timer *t = TIMER(u);
	310
	311	assert(u);
	312	assert(key);
	313	assert(value);
	314	assert(fds);
	315
	316	if (streq(key, "state")) {
	317	TimerState state;
	318
	319	if ((state = timer_state_from_string(value)) < 0)
	320	log_debug("Failed to parse state value %s", value);
	321	else
	322	t->deserialized_state = state;
	323	} else
	324	log_debug("Unknown serialization key '%s'", key);
	325
	326	return 0;
034c6ed7 LP	327	}
034c6ed7 LP	328
87f0e418	329	static UnitActiveState timer_active_state(Unit *u) {
871d7de4 LP	330	assert(u);
	331
	332	return state_translation_table[TIMER(u)->state];
	333	}
	334
	335	static const char timer_sub_state_to_string(Unit u) {
	336	assert(u);
	337
	338	return timer_state_to_string(TIMER(u)->state);
	339	}
	340
	341	static void timer_timer_event(Unit u, uint64_t elapsed, Watch w) {
	342	Timer *t = TIMER(u);
	343
	344	assert(t);
	345	assert(elapsed == 1);
5cb5a6ff	346
871d7de4 LP	347	if (t->state != TIMER_WAITING)
871d7de4 LP	348	return;
5cb5a6ff	349
871d7de4 LP	350	log_debug("Timer elapsed on %s", u->meta.id);
871d7de4 LP	351	timer_enter_running(t);
5cb5a6ff LP	352	}
5cb5a6ff LP	353
871d7de4 LP	354	void timer_unit_notify(Unit *u, UnitActiveState new_state) {
	355	char *n;
	356	int r;
	357	Iterator i;
	358
	359	if (u->meta.type == UNIT_TIMER)
	360	return;
	361
	362	SET_FOREACH(n, u->meta.names, i) {
	363	char *k;
	364	Unit *p;
	365	Timer *t;
	366	TimerValue *v;
	367
	368	if (!(k = unit_name_change_suffix(n, ".timer"))) {
	369	r = -ENOMEM;
	370	goto fail;
	371	}
	372
	373	p = manager_get_unit(u->meta.manager, k);
	374	free(k);
	375
	376	if (!p)
	377	continue;
	378
01f78473 LP	379	if (p->meta.load_state != UNIT_LOADED)
	380	continue;
	381
871d7de4 LP	382	t = TIMER(p);
871d7de4 LP	383
01f78473	384	if (t->unit != u)
871d7de4 LP	385	continue;
	386
	387	/* Reenable all timers that depend on unit state */
	388	LIST_FOREACH(value, v, t->values)
	389	if (v->base == TIMER_UNIT_ACTIVE \|\|
	390	v->base == TIMER_UNIT_INACTIVE)
	391	v->disabled = false;
	392
	393	switch (t->state) {
	394
	395	case TIMER_WAITING:
	396	case TIMER_ELAPSED:
	397
	398	/* Recalculate sleep time */
	399	timer_enter_waiting(t, false);
	400	break;
	401
	402	case TIMER_RUNNING:
	403
	404	if (new_state == UNIT_INACTIVE) {
	405	log_debug("%s got notified about unit deactivation.", t->meta.id);
	406	timer_enter_waiting(t, false);
	407	}
	408
	409	break;
	410
	411	case TIMER_DEAD:
	412	case TIMER_MAINTAINANCE:
	413	;
	414
	415	default:
	416	assert_not_reached("Unknown timer state");
	417	}
	418	}
	419
	420	return;
	421
	422	fail:
	423	log_error("Failed find timer unit: %s", strerror(-r));
	424	}
	425
	426	static const char* const timer_state_table[_TIMER_STATE_MAX] = {
	427	[TIMER_DEAD] = "dead",
	428	[TIMER_WAITING] = "waiting",
	429	[TIMER_RUNNING] = "running",
	430	[TIMER_ELAPSED] = "elapsed",
	431	[TIMER_MAINTAINANCE] = "maintainance"
	432	};
	433
	434	DEFINE_STRING_TABLE_LOOKUP(timer_state, TimerState);
	435
	436	static const char* const timer_base_table[_TIMER_BASE_MAX] = {
	437	[TIMER_ACTIVE] = "OnActive",
	438	[TIMER_BOOT] = "OnBoot",
	439	[TIMER_STARTUP] = "OnStartup",
	440	[TIMER_UNIT_ACTIVE] = "OnUnitActive",
	441	[TIMER_UNIT_INACTIVE] = "OnUnitInactive"
	442	};
	443
	444	DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);
	445
87f0e418	446	const UnitVTable timer_vtable = {
5cb5a6ff LP	447	.suffix = ".timer",
5cb5a6ff LP	448
871d7de4	449	.init = timer_init,
034c6ed7	450	.done = timer_done,
871d7de4 LP	451	.load = timer_load,
	452
	453	.coldplug = timer_coldplug,
	454
	455	.dump = timer_dump,
	456
	457	.start = timer_start,
	458	.stop = timer_stop,
	459
	460	.serialize = timer_serialize,
	461	.deserialize_item = timer_deserialize_item,
	462
	463	.active_state = timer_active_state,
	464	.sub_state_to_string = timer_sub_state_to_string,
	465
	466	.timer_event = timer_timer_event,
5cb5a6ff	467
871d7de4	468	.bus_message_handler = bus_timer_message_handler
5cb5a6ff	469	};