| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <errno.h> |
| |
| #include "alloc-util.h" |
| #include "bus-error.h" |
| #include "bus-util.h" |
| #include "dbus-timer.h" |
| #include "dbus-unit.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); |
| assert(UNIT(t)->load_state == UNIT_LOADED); |
| |
| if (!t->values && !t->on_clock_change && !t->on_timezone_change) { |
| 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 = strjoin("/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 uint64_t timer_get_fixed_delay_hash(Timer *t) { |
| static const uint8_t hash_key[] = { |
| 0x51, 0x0a, 0xdb, 0x76, 0x29, 0x51, 0x42, 0xc2, |
| 0x80, 0x35, 0xea, 0xe6, 0x8e, 0x3a, 0x37, 0xbd |
| }; |
| |
| struct siphash state; |
| sd_id128_t machine_id; |
| uid_t uid; |
| int r; |
| |
| assert(t); |
| |
| uid = getuid(); |
| r = sd_id128_get_machine(&machine_id); |
| if (r < 0) { |
| log_unit_debug_errno(UNIT(t), r, |
| "Failed to get machine ID for the fixed delay calculation, proceeding with 0: %m"); |
| machine_id = SD_ID128_NULL; |
| } |
| |
| siphash24_init(&state, hash_key); |
| siphash24_compress(&machine_id, sizeof(sd_id128_t), &state); |
| siphash24_compress_boolean(MANAGER_IS_SYSTEM(UNIT(t)->manager), &state); |
| siphash24_compress(&uid, sizeof(uid_t), &state); |
| siphash24_compress_string(UNIT(t)->id, &state); |
| |
| return siphash24_finalize(&state); |
| } |
| |
| 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, true); |
| if (r < 0) |
| return r; |
| |
| if (u->load_state != UNIT_LOADED) |
| return 0; |
| |
| /* This is a new unit? Then let's add in some extras */ |
| 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" |
| "%sFixedRandomDelay: %s\n" |
| "%sOnClockChange: %s\n" |
| "%sOnTimeZoneChange: %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), |
| prefix, yes_no(t->fixed_random_delay), |
| prefix, yes_no(t->on_clock_change), |
| prefix, yes_no(t->on_timezone_change)); |
| |
| 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); |
| |
| if (t->state != state) |
| bus_unit_send_pending_change_signal(UNIT(t), false); |
| |
| 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 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); |
| 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 = (t->fixed_random_delay ? timer_get_fixed_delay_hash(t) : 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 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, rebased; |
| |
| /* 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; |
| |
| /* To make the delay due to RandomizedDelaySec= work even at boot, if the scheduled |
| * time has already passed, set the time when systemd first started as the scheduled |
| * time. Note that we base this on the monotonic timestamp of the boot, not the |
| * realtime one, since the wallclock might have been off during boot. */ |
| rebased = map_clock_usec(UNIT(t)->manager->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic, |
| CLOCK_MONOTONIC, CLOCK_REALTIME); |
| if (v->next_elapse < rebased) |
| v->next_elapse = rebased; |
| |
| 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 = MAX(trigger->inactive_exit_timestamp.monotonic, t->last_trigger.monotonic); |
| if (base <= 0) |
| continue; |
| break; |
| |
| case TIMER_UNIT_INACTIVE: |
| leave_around = true; |
| base = MAX(trigger->inactive_enter_timestamp.monotonic, t->last_trigger.monotonic); |
| if (base <= 0) |
| continue; |
| 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 (dual_timestamp_is_set(&t->last_trigger) && |
| !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 && !t->on_timezone_change && !t->on_clock_change) { |
| 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, NULL, &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; |
| int r; |
| |
| assert(t); |
| assert(IN_SET(t->state, TIMER_DEAD, TIMER_FAILED)); |
| |
| r = unit_test_trigger_loaded(u); |
| if (r < 0) |
| return r; |
| |
| r = unit_test_start_limit(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, 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); |
| |
| /* Filter out invocations with bogus state */ |
| assert(UNIT_IS_LOAD_COMPLETE(other->load_state)); |
| |
| /* 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); |
| 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); |
| } |
| 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; |
| |
| if (t->on_clock_change) { |
| log_unit_debug(u, "Time change, triggering activation."); |
| timer_enter_running(t); |
| } else { |
| log_unit_debug(u, "Time change, recalculating next elapse."); |
| timer_enter_waiting(t, true); |
| } |
| } |
| |
| static void timer_timezone_change(Unit *u) { |
| Timer *t = TIMER(u); |
| |
| assert(u); |
| |
| if (t->state != TIMER_WAITING) |
| return; |
| |
| if (t->on_timezone_change) { |
| log_unit_debug(u, "Timezone change, triggering activation."); |
| timer_enter_running(t); |
| } else { |
| log_unit_debug(u, "Timezone change, recalculating next elapse."); |
| timer_enter_waiting(t, false); |
| } |
| } |
| |
| static int timer_clean(Unit *u, ExecCleanMask mask) { |
| Timer *t = TIMER(u); |
| int r; |
| |
| assert(t); |
| assert(mask != 0); |
| |
| if (t->state != TIMER_DEAD) |
| return -EBUSY; |
| |
| if (!IN_SET(mask, EXEC_CLEAN_STATE)) |
| return -EUNATCH; |
| |
| r = timer_setup_persistent(t); |
| if (r < 0) |
| return r; |
| |
| if (!t->stamp_path) |
| return -EUNATCH; |
| |
| if (unlink(t->stamp_path) && errno != ENOENT) |
| return log_unit_error_errno(u, errno, "Failed to clean stamp file of timer: %m"); |
| |
| return 0; |
| } |
| |
| static int timer_can_clean(Unit *u, ExecCleanMask *ret) { |
| Timer *t = TIMER(u); |
| |
| assert(t); |
| |
| *ret = t->persistent ? EXEC_CLEAN_STATE : 0; |
| return 0; |
| } |
| |
| 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", |
| |
| .can_transient = true, |
| .can_fail = true, |
| .can_trigger = true, |
| |
| .init = timer_init, |
| .done = timer_done, |
| .load = timer_load, |
| |
| .coldplug = timer_coldplug, |
| |
| .dump = timer_dump, |
| |
| .start = timer_start, |
| .stop = timer_stop, |
| |
| .clean = timer_clean, |
| .can_clean = timer_can_clean, |
| |
| .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_set_property = bus_timer_set_property, |
| }; |