/*-*- 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser 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" #include "special.h" #include "bus-errors.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 void timer_init(Unit *u) { Timer *t = TIMER(u); assert(u); assert(u->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); unit_ref_unset(&t->unit); } static int timer_verify(Timer *t) { assert(t); if (UNIT(t)->load_state != UNIT_LOADED) return 0; if (!t->values) { log_error("%s lacks value setting. Refusing.", UNIT(t)->id); return -EINVAL; } return 0; } static int timer_add_default_dependencies(Timer *t) { int r; assert(t); if (UNIT(t)->manager->running_as == SYSTEMD_SYSTEM) { if ((r = unit_add_dependency_by_name(UNIT(t), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) return r; if ((r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0) return r; } return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); } static int timer_load(Unit *u) { Timer *t = TIMER(u); int r; assert(u); assert(u->load_state == UNIT_STUB); if ((r = unit_load_fragment_and_dropin(u)) < 0) return r; if (u->load_state == UNIT_LOADED) { if (!UNIT_DEREF(t->unit)) { Unit *x; r = unit_load_related_unit(u, ".service", &x); if (r < 0) return r; unit_ref_set(&t->unit, x); } r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(t->unit), true); if (r < 0) return r; if (UNIT(t)->default_dependencies) if ((r = timer_add_default_dependencies(t)) < 0) return r; } return timer_verify(t); } static void timer_dump(Unit *u, FILE *f, const char *prefix) { Timer *t = TIMER(u); TimerValue *v; char timespan1[FORMAT_TIMESPAN_MAX]; fprintf(f, "%sTimer State: %s\n" "%sResult: %s\n" "%sUnit: %s\n", prefix, timer_state_to_string(t->state), prefix, timer_result_to_string(t->result), prefix, UNIT_DEREF(t->unit)->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))); } 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", UNIT(t)->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], true); } 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) timer_enter_waiting(t, false); else timer_set_state(t, t->deserialized_state); } return 0; } static void timer_enter_dead(Timer *t, TimerResult f) { assert(t); if (f != TIMER_SUCCESS) t->result = f; timer_set_state(t, t->result != TIMER_SUCCESS ? TIMER_FAILED : 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 = UNIT(t)->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 = UNIT(t)->manager->userspace_timestamp.monotonic; break; case TIMER_UNIT_ACTIVE: if (UNIT_DEREF(t->unit)->inactive_exit_timestamp.monotonic <= 0) continue; base = UNIT_DEREF(t->unit)->inactive_exit_timestamp.monotonic; break; case TIMER_UNIT_INACTIVE: if (UNIT_DEREF(t->unit)->inactive_enter_timestamp.monotonic <= 0) continue; base = UNIT_DEREF(t->unit)->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", UNIT(t)->id, strerror(-r)); timer_enter_dead(t, TIMER_FAILURE_RESOURCES); } static void timer_enter_running(Timer *t) { DBusError error; int r; assert(t); dbus_error_init(&error); /* Don't start job if we are supposed to go down */ if (UNIT(t)->job && UNIT(t)->job->type == JOB_STOP) return; if ((r = manager_add_job(UNIT(t)->manager, JOB_START, UNIT_DEREF(t->unit), JOB_REPLACE, true, &error, NULL)) < 0) goto fail; timer_set_state(t, TIMER_RUNNING); return; fail: log_warning("%s failed to queue unit startup job: %s", UNIT(t)->id, bus_error(&error, r)); timer_enter_dead(t, TIMER_FAILURE_RESOURCES); dbus_error_free(&error); } static int timer_start(Unit *u) { Timer *t = TIMER(u); assert(t); assert(t->state == TIMER_DEAD || t->state == TIMER_FAILED); if (UNIT_DEREF(t->unit)->load_state != UNIT_LOADED) return -ENOENT; t->result = TIMER_SUCCESS; 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, TIMER_SUCCESS); 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)); unit_serialize_item(u, f, "result", timer_result_to_string(t->result)); 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 if (streq(key, "result")) { TimerResult f; f = timer_result_from_string(value); if (f < 0) log_debug("Failed to parse result value %s", value); else if (f != TIMER_SUCCESS) t->result = f; } 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->id); timer_enter_running(t); } void timer_unit_notify(Unit *u, UnitActiveState new_state) { Iterator i; Unit *k; if (u->type == UNIT_TIMER) return; SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) { Timer *t; TimerValue *v; if (k->type != UNIT_TIMER) continue; if (k->load_state != UNIT_LOADED) continue; t = TIMER(k); /* 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 (UNIT_IS_INACTIVE_OR_FAILED(new_state)) { log_debug("%s got notified about unit deactivation.", UNIT(t)->id); timer_enter_waiting(t, 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 const char* const timer_state_table[_TIMER_STATE_MAX] = { [TIMER_DEAD] = "dead", [TIMER_WAITING] = "waiting", [TIMER_RUNNING] = "running", [TIMER_ELAPSED] = "elapsed", [TIMER_FAILED] = "failed" }; DEFINE_STRING_TABLE_LOOKUP(timer_state, TimerState); 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" }; DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase); static const char* const timer_result_table[_TIMER_RESULT_MAX] = { [TIMER_SUCCESS] = "success", [TIMER_FAILURE_RESOURCES] = "resources" }; DEFINE_STRING_TABLE_LOOKUP(timer_result, TimerResult); const UnitVTable timer_vtable = { .object_size = sizeof(Timer), .sections = "Unit\0" "Timer\0" "Install\0", .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, .reset_failed = timer_reset_failed, .bus_interface = "org.freedesktop.systemd1.Timer", .bus_message_handler = bus_timer_message_handler, .bus_invalidating_properties = bus_timer_invalidating_properties };