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Systemd/src/core/timer.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "dbus-timer.h"
#include "fs-util.h"
#include "parse-util.h"
#include "random-util.h"
#include "serialize.h"
#include "special.h"
#include "string-table.h"
#include "string-util.h"
#include "timer.h"
#include "unit-name.h"
#include "unit.h"
#include "user-util.h"
#include "virt.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_FAILED] = UNIT_FAILED
};
static int timer_dispatch(sd_event_source *s, uint64_t usec, void *userdata);
static void timer_init(Unit *u) {
Timer *t = TIMER(u);
assert(u);
assert(u->load_state == UNIT_STUB);
t->next_elapse_monotonic_or_boottime = USEC_INFINITY;
t->next_elapse_realtime = USEC_INFINITY;
t->accuracy_usec = u->manager->default_timer_accuracy_usec;
t->remain_after_elapse = true;
}
void timer_free_values(Timer *t) {
TimerValue *v;
assert(t);
while ((v = t->values)) {
LIST_REMOVE(value, t->values, v);
calendar_spec_free(v->calendar_spec);
free(v);
}
}
static void timer_done(Unit *u) {
Timer *t = TIMER(u);
assert(t);
timer_free_values(t);
t->monotonic_event_source = sd_event_source_unref(t->monotonic_event_source);
t->realtime_event_source = sd_event_source_unref(t->realtime_event_source);
free(t->stamp_path);
}
static int timer_verify(Timer *t) {
assert(t);
if (UNIT(t)->load_state != UNIT_LOADED)
return 0;
if (!t->values) {
log_unit_error(UNIT(t), "Timer unit lacks value setting. Refusing.");
return -ENOEXEC;
}
return 0;
}
static int timer_add_default_dependencies(Timer *t) {
int r;
TimerValue *v;
assert(t);
if (!UNIT(t)->default_dependencies)
return 0;
r = unit_add_dependency_by_name(UNIT(t), UNIT_BEFORE, SPECIAL_TIMERS_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
if (MANAGER_IS_SYSTEM(UNIT(t)->manager)) {
r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
LIST_FOREACH(value, v, t->values) {
if (v->base == TIMER_CALENDAR) {
r = unit_add_dependency_by_name(UNIT(t), UNIT_AFTER, SPECIAL_TIME_SYNC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
break;
}
}
}
return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
}
static int timer_add_trigger_dependencies(Timer *t) {
Unit *x;
int r;
assert(t);
if (!hashmap_isempty(UNIT(t)->dependencies[UNIT_TRIGGERS]))
return 0;
r = unit_load_related_unit(UNIT(t), ".service", &x);
if (r < 0)
return r;
return unit_add_two_dependencies(UNIT(t), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT);
}
static int timer_setup_persistent(Timer *t) {
int r;
assert(t);
if (!t->persistent)
return 0;
if (MANAGER_IS_SYSTEM(UNIT(t)->manager)) {
r = unit_require_mounts_for(UNIT(t), "/var/lib/systemd/timers", UNIT_DEPENDENCY_FILE);
if (r < 0)
return r;
t->stamp_path = strappend("/var/lib/systemd/timers/stamp-", UNIT(t)->id);
} else {
const char *e;
e = getenv("XDG_DATA_HOME");
if (e)
t->stamp_path = strjoin(e, "/systemd/timers/stamp-", UNIT(t)->id);
else {
_cleanup_free_ char *h = NULL;
r = get_home_dir(&h);
if (r < 0)
return log_unit_error_errno(UNIT(t), r, "Failed to determine home directory: %m");
t->stamp_path = strjoin(h, "/.local/share/systemd/timers/stamp-", UNIT(t)->id);
}
}
if (!t->stamp_path)
return log_oom();
return 0;
}
static int timer_load(Unit *u) {
Timer *t = TIMER(u);
int r;
assert(u);
assert(u->load_state == UNIT_STUB);
r = unit_load_fragment_and_dropin(u);
if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
r = timer_add_trigger_dependencies(t);
if (r < 0)
return r;
r = timer_setup_persistent(t);
if (r < 0)
return r;
r = timer_add_default_dependencies(t);
if (r < 0)
return r;
}
return timer_verify(t);
}
static void timer_dump(Unit *u, FILE *f, const char *prefix) {
char buf[FORMAT_TIMESPAN_MAX];
Timer *t = TIMER(u);
Unit *trigger;
TimerValue *v;
trigger = UNIT_TRIGGER(u);
fprintf(f,
"%sTimer State: %s\n"
"%sResult: %s\n"
"%sUnit: %s\n"
"%sPersistent: %s\n"
"%sWakeSystem: %s\n"
"%sAccuracy: %s\n"
"%sRemainAfterElapse: %s\n",
prefix, timer_state_to_string(t->state),
prefix, timer_result_to_string(t->result),
prefix, trigger ? trigger->id : "n/a",
prefix, yes_no(t->persistent),
prefix, yes_no(t->wake_system),
prefix, format_timespan(buf, sizeof(buf), t->accuracy_usec, 1),
prefix, yes_no(t->remain_after_elapse));
LIST_FOREACH(value, v, t->values) {
if (v->base == TIMER_CALENDAR) {
_cleanup_free_ char *p = NULL;
(void) calendar_spec_to_string(v->calendar_spec, &p);
fprintf(f,
"%s%s: %s\n",
prefix,
timer_base_to_string(v->base),
strna(p));
} else {
char timespan1[FORMAT_TIMESPAN_MAX];
fprintf(f,
"%s%s: %s\n",
prefix,
timer_base_to_string(v->base),
format_timespan(timespan1, sizeof(timespan1), v->value, 0));
}
}
}
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) {
t->monotonic_event_source = sd_event_source_unref(t->monotonic_event_source);
t->realtime_event_source = sd_event_source_unref(t->realtime_event_source);
t->next_elapse_monotonic_or_boottime = USEC_INFINITY;
t->next_elapse_realtime = USEC_INFINITY;
}
if (state != old_state)
log_unit_debug(UNIT(t), "Changed %s -> %s", timer_state_to_string(old_state), timer_state_to_string(state));
unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], 0);
}
static void timer_enter_waiting(Timer *t, bool initial, bool time_change);
static int timer_coldplug(Unit *u) {
Timer *t = TIMER(u);
assert(t);
assert(t->state == TIMER_DEAD);
if (t->deserialized_state == t->state)
return 0;
if (t->deserialized_state == TIMER_WAITING)
timer_enter_waiting(t, false, false);
else
timer_set_state(t, t->deserialized_state);
return 0;
}
static void timer_enter_dead(Timer *t, TimerResult f) {
assert(t);
if (t->result == TIMER_SUCCESS)
t->result = f;
unit_log_result(UNIT(t), t->result == TIMER_SUCCESS, timer_result_to_string(t->result));
timer_set_state(t, t->result != TIMER_SUCCESS ? TIMER_FAILED : TIMER_DEAD);
}
static void timer_enter_elapsed(Timer *t, bool leave_around) {
assert(t);
/* If a unit is marked with RemainAfterElapse=yes we leave it
* around even after it elapsed once, so that starting it
* later again does not necessarily mean immediate
* retriggering. We unconditionally leave units with
* TIMER_UNIT_ACTIVE or TIMER_UNIT_INACTIVE triggers around,
* since they might be restarted automatically at any time
* later on. */
if (t->remain_after_elapse || leave_around)
timer_set_state(t, TIMER_ELAPSED);
else
timer_enter_dead(t, TIMER_SUCCESS);
}
static void add_random(Timer *t, usec_t *v) {
char s[FORMAT_TIMESPAN_MAX];
usec_t add;
assert(t);
assert(v);
if (t->random_usec == 0)
return;
if (*v == USEC_INFINITY)
return;
add = random_u64() % t->random_usec;
if (*v + add < *v) /* overflow */
*v = (usec_t) -2; /* Highest possible value, that is not USEC_INFINITY */
else
*v += add;
log_unit_debug(UNIT(t), "Adding %s random time.", format_timespan(s, sizeof(s), add, 0));
}
static void timer_enter_waiting(Timer *t, bool initial, bool time_change) {
bool found_monotonic = false, found_realtime = false;
bool leave_around = false;
triple_timestamp ts;
TimerValue *v;
Unit *trigger;
int r;
assert(t);
trigger = UNIT_TRIGGER(UNIT(t));
if (!trigger) {
log_unit_error(UNIT(t), "Unit to trigger vanished.");
timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
return;
}
triple_timestamp_get(&ts);
t->next_elapse_monotonic_or_boottime = t->next_elapse_realtime = 0;
LIST_FOREACH(value, v, t->values) {
if (v->disabled)
continue;
if (v->base == TIMER_CALENDAR) {
usec_t b;
/* If we know the last time this was
* triggered, schedule the job based relative
* to that. If we don't, just start from
* the activation time. */
if (t->last_trigger.realtime > 0)
b = t->last_trigger.realtime;
else {
if (state_translation_table[t->state] == UNIT_ACTIVE)
b = UNIT(t)->inactive_exit_timestamp.realtime;
else
b = ts.realtime;
}
r = calendar_spec_next_usec(v->calendar_spec, b, &v->next_elapse);
if (r < 0)
continue;
if (!found_realtime)
t->next_elapse_realtime = v->next_elapse;
else
t->next_elapse_realtime = MIN(t->next_elapse_realtime, v->next_elapse);
found_realtime = true;
} else {
usec_t base;
switch (v->base) {
case TIMER_ACTIVE:
if (state_translation_table[t->state] == UNIT_ACTIVE)
base = UNIT(t)->inactive_exit_timestamp.monotonic;
else
base = ts.monotonic;
break;
case TIMER_BOOT:
if (detect_container() <= 0) {
/* CLOCK_MONOTONIC equals the uptime on Linux */
base = 0;
break;
}
/* In a container we don't want to include the time the host
* was already up when the container started, so count from
* our own startup. */
_fallthrough_;
case TIMER_STARTUP:
base = UNIT(t)->manager->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic;
break;
case TIMER_UNIT_ACTIVE:
leave_around = true;
base = trigger->inactive_exit_timestamp.monotonic;
if (base <= 0)
base = t->last_trigger.monotonic;
if (base <= 0)
continue;
base = MAX(base, t->last_trigger.monotonic);
break;
case TIMER_UNIT_INACTIVE:
leave_around = true;
base = trigger->inactive_enter_timestamp.monotonic;
if (base <= 0)
base = t->last_trigger.monotonic;
if (base <= 0)
continue;
base = MAX(base, t->last_trigger.monotonic);
break;
default:
assert_not_reached("Unknown timer base");
}
v->next_elapse = usec_add(usec_shift_clock(base, CLOCK_MONOTONIC, TIMER_MONOTONIC_CLOCK(t)), v->value);
if (!initial && !time_change &&
v->next_elapse < triple_timestamp_by_clock(&ts, TIMER_MONOTONIC_CLOCK(t)) &&
IN_SET(v->base, TIMER_ACTIVE, TIMER_BOOT, TIMER_STARTUP)) {
/* This is a one time trigger, disable it now */
v->disabled = true;
continue;
}
if (!found_monotonic)
t->next_elapse_monotonic_or_boottime = v->next_elapse;
else
t->next_elapse_monotonic_or_boottime = MIN(t->next_elapse_monotonic_or_boottime, v->next_elapse);
found_monotonic = true;
}
}
if (!found_monotonic && !found_realtime) {
log_unit_debug(UNIT(t), "Timer is elapsed.");
timer_enter_elapsed(t, leave_around);
return;
}
if (found_monotonic) {
char buf[FORMAT_TIMESPAN_MAX];
usec_t left;
add_random(t, &t->next_elapse_monotonic_or_boottime);
left = usec_sub_unsigned(t->next_elapse_monotonic_or_boottime, triple_timestamp_by_clock(&ts, TIMER_MONOTONIC_CLOCK(t)));
log_unit_debug(UNIT(t), "Monotonic timer elapses in %s.", format_timespan(buf, sizeof(buf), left, 0));
if (t->monotonic_event_source) {
r = sd_event_source_set_time(t->monotonic_event_source, t->next_elapse_monotonic_or_boottime);
if (r < 0)
goto fail;
r = sd_event_source_set_enabled(t->monotonic_event_source, SD_EVENT_ONESHOT);
if (r < 0)
goto fail;
} else {
r = sd_event_add_time(
UNIT(t)->manager->event,
&t->monotonic_event_source,
t->wake_system ? CLOCK_BOOTTIME_ALARM : CLOCK_MONOTONIC,
t->next_elapse_monotonic_or_boottime, t->accuracy_usec,
timer_dispatch, t);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(t->monotonic_event_source, "timer-monotonic");
}
} else if (t->monotonic_event_source) {
r = sd_event_source_set_enabled(t->monotonic_event_source, SD_EVENT_OFF);
if (r < 0)
goto fail;
}
if (found_realtime) {
char buf[FORMAT_TIMESTAMP_MAX];
add_random(t, &t->next_elapse_realtime);
log_unit_debug(UNIT(t), "Realtime timer elapses at %s.", format_timestamp(buf, sizeof(buf), t->next_elapse_realtime));
if (t->realtime_event_source) {
r = sd_event_source_set_time(t->realtime_event_source, t->next_elapse_realtime);
if (r < 0)
goto fail;
r = sd_event_source_set_enabled(t->realtime_event_source, SD_EVENT_ONESHOT);
if (r < 0)
goto fail;
} else {
r = sd_event_add_time(
UNIT(t)->manager->event,
&t->realtime_event_source,
t->wake_system ? CLOCK_REALTIME_ALARM : CLOCK_REALTIME,
t->next_elapse_realtime, t->accuracy_usec,
timer_dispatch, t);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(t->realtime_event_source, "timer-realtime");
}
} else if (t->realtime_event_source) {
r = sd_event_source_set_enabled(t->realtime_event_source, SD_EVENT_OFF);
if (r < 0)
goto fail;
}
timer_set_state(t, TIMER_WAITING);
return;
fail:
log_unit_warning_errno(UNIT(t), r, "Failed to enter waiting state: %m");
timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
}
static void timer_enter_running(Timer *t) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
Unit *trigger;
int r;
assert(t);
/* Don't start job if we are supposed to go down */
if (unit_stop_pending(UNIT(t)))
return;
trigger = UNIT_TRIGGER(UNIT(t));
if (!trigger) {
log_unit_error(UNIT(t), "Unit to trigger vanished.");
timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
return;
}
r = manager_add_job(UNIT(t)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL);
if (r < 0)
goto fail;
dual_timestamp_get(&t->last_trigger);
if (t->stamp_path)
touch_file(t->stamp_path, true, t->last_trigger.realtime, UID_INVALID, GID_INVALID, MODE_INVALID);
timer_set_state(t, TIMER_RUNNING);
return;
fail:
log_unit_warning(UNIT(t), "Failed to queue unit startup job: %s", bus_error_message(&error, r));
timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
}
static int timer_start(Unit *u) {
Timer *t = TIMER(u);
TimerValue *v;
Unit *trigger;
int r;
assert(t);
assert(IN_SET(t->state, TIMER_DEAD, TIMER_FAILED));
trigger = UNIT_TRIGGER(u);
if (!trigger || trigger->load_state != UNIT_LOADED) {
log_unit_error(u, "Refusing to start, unit to trigger not loaded.");
return -ENOENT;
}
r = unit_start_limit_test(u);
if (r < 0) {
timer_enter_dead(t, TIMER_FAILURE_START_LIMIT_HIT);
return r;
}
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
t->last_trigger = DUAL_TIMESTAMP_NULL;
/* Reenable all timers that depend on unit activation time */
LIST_FOREACH(value, v, t->values)
if (v->base == TIMER_ACTIVE)
v->disabled = false;
if (t->stamp_path) {
struct stat st;
if (stat(t->stamp_path, &st) >= 0) {
usec_t ft;
/* Load the file timestamp, but only if it is actually in the past. If it is in the future,
* something is wrong with the system clock. */
ft = timespec_load(&st.st_mtim);
if (ft < now(CLOCK_REALTIME))
t->last_trigger.realtime = ft;
else {
char z[FORMAT_TIMESTAMP_MAX];
log_unit_warning(u, "Not using persistent file timestamp %s as it is in the future.",
format_timestamp(z, sizeof(z), ft));
}
} else if (errno == ENOENT)
/* The timer has never run before,
* make sure a stamp file exists.
*/
(void) touch_file(t->stamp_path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID);
}
t->result = TIMER_SUCCESS;
timer_enter_waiting(t, true, false);
return 1;
}
static int timer_stop(Unit *u) {
Timer *t = TIMER(u);
assert(t);
assert(IN_SET(t->state, TIMER_WAITING, TIMER_RUNNING, TIMER_ELAPSED));
timer_enter_dead(t, TIMER_SUCCESS);
return 1;
}
static int timer_serialize(Unit *u, FILE *f, FDSet *fds) {
Timer *t = TIMER(u);
assert(u);
assert(f);
assert(fds);
(void) serialize_item(f, "state", timer_state_to_string(t->state));
(void) serialize_item(f, "result", timer_result_to_string(t->result));
if (t->last_trigger.realtime > 0)
(void) serialize_usec(f, "last-trigger-realtime", t->last_trigger.realtime);
if (t->last_trigger.monotonic > 0)
(void) serialize_usec(f, "last-trigger-monotonic", t->last_trigger.monotonic);
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;
state = timer_state_from_string(value);
if (state < 0)
log_unit_debug(u, "Failed to parse state value: %s", value);
else
t->deserialized_state = state;
} else if (streq(key, "result")) {
TimerResult f;
f = timer_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse result value: %s", value);
else if (f != TIMER_SUCCESS)
t->result = f;
} else if (streq(key, "last-trigger-realtime"))
(void) deserialize_usec(value, &t->last_trigger.realtime);
else if (streq(key, "last-trigger-monotonic"))
(void) deserialize_usec(value, &t->last_trigger.monotonic);
else
log_unit_debug(u, "Unknown serialization key: %s", key);
return 0;
}
_pure_ static UnitActiveState timer_active_state(Unit *u) {
assert(u);
return state_translation_table[TIMER(u)->state];
}
_pure_ static const char *timer_sub_state_to_string(Unit *u) {
assert(u);
return timer_state_to_string(TIMER(u)->state);
}
static int timer_dispatch(sd_event_source *s, uint64_t usec, void *userdata) {
Timer *t = TIMER(userdata);
assert(t);
if (t->state != TIMER_WAITING)
return 0;
log_unit_debug(UNIT(t), "Timer elapsed.");
timer_enter_running(t);
return 0;
}
static void timer_trigger_notify(Unit *u, Unit *other) {
Timer *t = TIMER(u);
TimerValue *v;
assert(u);
assert(other);
if (other->load_state != UNIT_LOADED)
return;
/* Reenable all timers that depend on unit state */
LIST_FOREACH(value, v, t->values)
if (IN_SET(v->base, TIMER_UNIT_ACTIVE, TIMER_UNIT_INACTIVE))
v->disabled = false;
switch (t->state) {
case TIMER_WAITING:
case TIMER_ELAPSED:
/* Recalculate sleep time */
timer_enter_waiting(t, false, false);
break;
case TIMER_RUNNING:
if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
log_unit_debug(UNIT(t), "Got notified about unit deactivation.");
timer_enter_waiting(t, false, false);
}
break;
case TIMER_DEAD:
case TIMER_FAILED:
break;
default:
assert_not_reached("Unknown timer state");
}
}
static void timer_reset_failed(Unit *u) {
Timer *t = TIMER(u);
assert(t);
if (t->state == TIMER_FAILED)
timer_set_state(t, TIMER_DEAD);
t->result = TIMER_SUCCESS;
}
static void timer_time_change(Unit *u) {
Timer *t = TIMER(u);
usec_t ts;
assert(u);
if (t->state != TIMER_WAITING)
return;
/* If we appear to have triggered in the future, the system clock must
* have been set backwards. So let's rewind our own clock and allow
* the future trigger(s) to happen again :). Exactly the same as when
* you start a timer unit with Persistent=yes. */
ts = now(CLOCK_REALTIME);
if (t->last_trigger.realtime > ts)
t->last_trigger.realtime = ts;
log_unit_debug(u, "Time change, recalculating next elapse.");
timer_enter_waiting(t, false, true);
}
static void timer_timezone_change(Unit *u) {
Timer *t = TIMER(u);
assert(u);
if (t->state != TIMER_WAITING)
return;
log_unit_debug(u, "Timezone change, recalculating next elapse.");
timer_enter_waiting(t, false, false);
}
static const char* const timer_base_table[_TIMER_BASE_MAX] = {
[TIMER_ACTIVE] = "OnActiveSec",
[TIMER_BOOT] = "OnBootSec",
[TIMER_STARTUP] = "OnStartupSec",
[TIMER_UNIT_ACTIVE] = "OnUnitActiveSec",
[TIMER_UNIT_INACTIVE] = "OnUnitInactiveSec",
[TIMER_CALENDAR] = "OnCalendar"
};
DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);
static const char* const timer_result_table[_TIMER_RESULT_MAX] = {
[TIMER_SUCCESS] = "success",
[TIMER_FAILURE_RESOURCES] = "resources",
[TIMER_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
};
DEFINE_STRING_TABLE_LOOKUP(timer_result, TimerResult);
const UnitVTable timer_vtable = {
.object_size = sizeof(Timer),
.sections =
"Unit\0"
"Timer\0"
"Install\0",
.private_section = "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,
.trigger_notify = timer_trigger_notify,
.reset_failed = timer_reset_failed,
.time_change = timer_time_change,
.timezone_change = timer_timezone_change,
.bus_vtable = bus_timer_vtable,
.bus_set_property = bus_timer_set_property,
.can_transient = true,
};
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