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-rw-r--r--src/core/timer.c194
1 files changed, 137 insertions, 57 deletions
diff --git a/src/core/timer.c b/src/core/timer.c
index 7f4a2eb716..9538059c13 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -21,13 +19,21 @@
#include <errno.h>
-#include "unit.h"
-#include "unit-name.h"
-#include "timer.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 "special.h"
-#include "bus-util.h"
-#include "bus-error.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,
@@ -48,6 +54,7 @@ static void timer_init(Unit *u) {
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) {
@@ -57,10 +64,7 @@ void timer_free_values(Timer *t) {
while ((v = t->values)) {
LIST_REMOVE(value, t->values, v);
-
- if (v->calendar_spec)
- calendar_spec_free(v->calendar_spec);
-
+ calendar_spec_free(v->calendar_spec);
free(v);
}
}
@@ -98,11 +102,14 @@ static int timer_add_default_dependencies(Timer *t) {
assert(t);
+ if (!UNIT(t)->default_dependencies)
+ return 0;
+
r = unit_add_dependency_by_name(UNIT(t), UNIT_BEFORE, SPECIAL_TIMERS_TARGET, NULL, true);
if (r < 0)
return r;
- if (UNIT(t)->manager->running_as == MANAGER_SYSTEM) {
+ if (MANAGER_IS_SYSTEM(UNIT(t)->manager)) {
r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
if (r < 0)
return r;
@@ -128,7 +135,7 @@ static int timer_setup_persistent(Timer *t) {
if (!t->persistent)
return 0;
- if (UNIT(t)->manager->running_as == MANAGER_SYSTEM) {
+ if (MANAGER_IS_SYSTEM(UNIT(t)->manager)) {
r = unit_require_mounts_for(UNIT(t), "/var/lib/systemd/timers");
if (r < 0)
@@ -188,11 +195,9 @@ static int timer_load(Unit *u) {
if (r < 0)
return r;
- if (u->default_dependencies) {
- r = timer_add_default_dependencies(t);
- if (r < 0)
- return r;
- }
+ r = timer_add_default_dependencies(t);
+ if (r < 0)
+ return r;
}
return timer_verify(t);
@@ -212,13 +217,15 @@ static void timer_dump(Unit *u, FILE *f, const char *prefix) {
"%sUnit: %s\n"
"%sPersistent: %s\n"
"%sWakeSystem: %s\n"
- "%sAccuracy: %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, format_timespan(buf, sizeof(buf), t->accuracy_usec, 1),
+ prefix, yes_no(t->remain_after_elapse));
LIST_FOREACH(value, v, t->values) {
@@ -270,13 +277,13 @@ static int timer_coldplug(Unit *u) {
assert(t);
assert(t->state == TIMER_DEAD);
- if (t->deserialized_state != t->state) {
+ 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);
- }
+ if (t->deserialized_state == TIMER_WAITING)
+ timer_enter_waiting(t, false);
+ else
+ timer_set_state(t, t->deserialized_state);
return 0;
}
@@ -284,19 +291,36 @@ static int timer_coldplug(Unit *u) {
static void timer_enter_dead(Timer *t, TimerResult f) {
assert(t);
- if (f != TIMER_SUCCESS)
+ if (t->result == TIMER_SUCCESS)
t->result = f;
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 usec_t monotonic_to_boottime(usec_t t) {
usec_t a, b;
if (t <= 0)
return 0;
- a = now(CLOCK_BOOTTIME);
+ a = now(clock_boottime_or_monotonic());
b = now(CLOCK_MONOTONIC);
if (t + a > b)
@@ -305,18 +329,51 @@ static usec_t monotonic_to_boottime(usec_t t) {
return 0;
}
+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_info(UNIT(t), "Adding %s random time.", format_timespan(s, sizeof(s), add, 0));
+}
+
static void timer_enter_waiting(Timer *t, bool initial) {
bool found_monotonic = false, found_realtime = false;
usec_t ts_realtime, ts_monotonic;
usec_t base = 0;
+ bool leave_around = false;
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;
+ }
+
/* If we shall wake the system we use the boottime clock
* rather than the monotonic clock. */
ts_realtime = now(CLOCK_REALTIME);
- ts_monotonic = now(t->wake_system ? CLOCK_BOOTTIME : CLOCK_MONOTONIC);
+ ts_monotonic = now(t->wake_system ? clock_boottime_or_monotonic() : CLOCK_MONOTONIC);
t->next_elapse_monotonic_or_boottime = t->next_elapse_realtime = 0;
LIST_FOREACH(value, v, t->values) {
@@ -356,17 +413,21 @@ static void timer_enter_waiting(Timer *t, bool initial) {
break;
case TIMER_BOOT:
- /* CLOCK_MONOTONIC equals the uptime on Linux */
- base = 0;
- break;
-
+ 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. Fall through. */
case TIMER_STARTUP:
base = UNIT(t)->manager->userspace_timestamp.monotonic;
break;
case TIMER_UNIT_ACTIVE:
-
- base = UNIT_TRIGGER(UNIT(t))->inactive_exit_timestamp.monotonic;
+ leave_around = true;
+ base = trigger->inactive_exit_timestamp.monotonic;
if (base <= 0)
base = t->last_trigger.monotonic;
@@ -377,8 +438,8 @@ static void timer_enter_waiting(Timer *t, bool initial) {
break;
case TIMER_UNIT_INACTIVE:
-
- base = UNIT_TRIGGER(UNIT(t))->inactive_enter_timestamp.monotonic;
+ leave_around = true;
+ base = trigger->inactive_enter_timestamp.monotonic;
if (base <= 0)
base = t->last_trigger.monotonic;
@@ -414,14 +475,18 @@ static void timer_enter_waiting(Timer *t, bool initial) {
if (!found_monotonic && !found_realtime) {
log_unit_debug(UNIT(t), "Timer is elapsed.");
- timer_set_state(t, TIMER_ELAPSED);
+ timer_enter_elapsed(t, leave_around);
return;
}
if (found_monotonic) {
char buf[FORMAT_TIMESPAN_MAX];
+ usec_t left;
- log_unit_debug(UNIT(t), "Monotonic timer elapses in %s.", format_timespan(buf, sizeof(buf), t->next_elapse_monotonic_or_boottime > ts_monotonic ? t->next_elapse_monotonic_or_boottime - ts_monotonic : 0, 0));
+ add_random(t, &t->next_elapse_monotonic_or_boottime);
+
+ left = t->next_elapse_monotonic_or_boottime > ts_monotonic ? t->next_elapse_monotonic_or_boottime - ts_monotonic : 0;
+ 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);
@@ -454,6 +519,9 @@ static void timer_enter_waiting(Timer *t, bool initial) {
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) {
@@ -493,7 +561,8 @@ fail:
}
static void timer_enter_running(Timer *t) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ Unit *trigger;
int r;
assert(t);
@@ -502,15 +571,21 @@ static void timer_enter_running(Timer *t) {
if (unit_stop_pending(UNIT(t)))
return;
- r = manager_add_job(UNIT(t)->manager, JOB_START, UNIT_TRIGGER(UNIT(t)),
- JOB_REPLACE, true, &error, NULL);
+ 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, 0);
+ touch_file(t->stamp_path, true, t->last_trigger.realtime, UID_INVALID, GID_INVALID, MODE_INVALID);
timer_set_state(t, TIMER_RUNNING);
return;
@@ -523,12 +598,27 @@ fail:
static int timer_start(Unit *u) {
Timer *t = TIMER(u);
TimerValue *v;
+ Unit *trigger;
+ int r;
assert(t);
assert(t->state == TIMER_DEAD || t->state == TIMER_FAILED);
- if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
+ 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;
@@ -546,7 +636,7 @@ static int timer_start(Unit *u) {
/* The timer has never run before,
* make sure a stamp file exists.
*/
- touch_file(t->stamp_path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0);
+ (void) touch_file(t->stamp_path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID);
}
t->result = TIMER_SUCCESS;
@@ -716,16 +806,6 @@ static void timer_time_change(Unit *u) {
timer_enter_waiting(t, false);
}
-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",
@@ -739,7 +819,8 @@ 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_RESOURCES] = "resources",
+ [TIMER_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
};
DEFINE_STRING_TABLE_LOOKUP(timer_result, TimerResult);
@@ -775,7 +856,6 @@ const UnitVTable timer_vtable = {
.reset_failed = timer_reset_failed,
.time_change = timer_time_change,
- .bus_interface = "org.freedesktop.systemd1.Timer",
.bus_vtable = bus_timer_vtable,
.bus_set_property = bus_timer_set_property,
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-22 23:00:19 +0000