diff options
Diffstat (limited to 'src/timer.c')
| -rw-r--r-- | src/timer.c | 428 |
1 files changed, 420 insertions, 8 deletions
diff --git a/src/timer.c b/src/timer.c index 41aeb7f3a5..e95b4d66e1 100644 --- a/src/timer.c +++ b/src/timer.c @@ -22,30 +22,442 @@ #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; + t->timer_watch.type = WATCH_INVALID; +} 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); + + 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); - static const UnitActiveState table[_TIMER_STATE_MAX] = { - [TIMER_DEAD] = UNIT_INACTIVE, - [TIMER_WAITING] = UNIT_ACTIVE, - [TIMER_RUNNING] = UNIT_ACTIVE - }; + if (t->state != TIMER_WAITING) + return; - return table[TIMER(u)->state]; + 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; + + t = TIMER(p); + + if (t->meta.load_state != UNIT_LOADED) + 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", - .load = unit_load_fragment_and_dropin, + .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, - .active_state = timer_active_state + .bus_message_handler = bus_timer_message_handler }; |