diff options
Diffstat (limited to 'src/timer.c')
| -rw-r--r-- | src/timer.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/src/timer.c b/src/timer.c new file mode 100644 index 0000000000..e318fee201 --- /dev/null +++ b/src/timer.c @@ -0,0 +1,520 @@ +/*-*- 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 "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 == MANAGER_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->startup_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 = { + .suffix = ".timer", + .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 +}; |