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timer: implement calendar time events

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This commit is contained in:
Lennart Poettering
2012-11-23 21:37:58 +01:00
parent 8a1175118e
commit 36697dc019
16 changed files with 1293 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/core/dbus-timer.c
+4 -2
View File
@@ -79,7 +79,8 @@ static int bus_timer_append_timers(DBusMessageIter *i, const char *property, voi
/* s/Sec/USec/ */
l = strlen(t);
if (!(buf = new(char, l+2)))
buf = new(char, l+2);
if (!buf)
return -ENOMEM;
memcpy(buf, t, l-3);
@@ -121,7 +122,8 @@ static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_timer_append_timer_result, timer_resu
static const BusProperty bus_timer_properties[] = {
{ "Unit", bus_timer_append_unit, "s", 0 },
{ "Timers", bus_timer_append_timers, "a(stt)", 0 },
{ "NextElapseUSec", bus_property_append_usec, "t", offsetof(Timer, next_elapse) },
{ "NextElapseUSec", bus_property_append_usec, "t", offsetof(Timer, next_elapse_monotonic) },
{ "NextElapseUSecRealtime", bus_property_append_usec, "t", offsetof(Timer, next_elapse_realtime) },
{ "Result", bus_timer_append_timer_result,"s", offsetof(Timer, result) },
{ NULL, }
};
src/core/load-fragment-gperf.gperf.m4
+1
View File
@@ -234,6 +234,7 @@ Swap.TimeoutSec, config_parse_usec, 0,
EXEC_CONTEXT_CONFIG_ITEMS(Swap)m4_dnl
KILL_CONTEXT_CONFIG_ITEMS(Swap)m4_dnl
m4_dnl
Timer.OnCalendar, config_parse_timer, 0, 0
Timer.OnActiveSec, config_parse_timer, 0, 0
Timer.OnBootSec, config_parse_timer, 0, 0
Timer.OnStartupSec, config_parse_timer, 0, 0
src/core/load-fragment.c
+23 -6
View File
@@ -1136,30 +1136,47 @@ int config_parse_timer(
void *userdata) {
Timer *t = data;
usec_t u;
usec_t u = 0;
TimerValue *v;
TimerBase b;
CalendarSpec *c = NULL;
clockid_t id;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if ((b = timer_base_from_string(lvalue)) < 0) {
b = timer_base_from_string(lvalue);
if (b < 0) {
log_error("[%s:%u] Failed to parse timer base, ignoring: %s", filename, line, lvalue);
return 0;
}
if (parse_usec(rvalue, &u) < 0) {
log_error("[%s:%u] Failed to parse timer value, ignoring: %s", filename, line, rvalue);
return 0;
if (b == TIMER_CALENDAR) {
if (calendar_spec_from_string(rvalue, &c) < 0) {
log_error("[%s:%u] Failed to parse calendar specification, ignoring: %s", filename, line, rvalue);
return 0;
}
id = CLOCK_REALTIME;
} else {
if (parse_usec(rvalue, &u) < 0) {
log_error("[%s:%u] Failed to parse timer value, ignoring: %s", filename, line, rvalue);
return 0;
}
id = CLOCK_MONOTONIC;
}
if (!(v = new0(TimerValue, 1)))
v = new0(TimerValue, 1);
if (!v)
return -ENOMEM;
v->base = b;
v->clock_id = id;
v->value = u;
v->calendar_spec = c;
LIST_PREPEND(TimerValue, value, t->values, v);
src/core/mount.c
+8 -4
View File
@@ -741,10 +741,12 @@ static int mount_coldplug(Unit *u) {
if (m->control_pid <= 0)
return -EBADMSG;
if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
r = unit_watch_pid(UNIT(m), m->control_pid);
if (r < 0)
return r;
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
r = unit_watch_timer(UNIT(m), CLOCK_MONOTONIC, true, m->timeout_usec, &m->timer_watch);
if (r < 0)
return r;
}
@@ -800,7 +802,8 @@ static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
assert(c);
assert(_pid);
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
r = unit_watch_timer(UNIT(m), CLOCK_MONOTONIC, true, m->timeout_usec, &m->timer_watch);
if (r < 0)
goto fail;
if ((r = exec_spawn(c,
@@ -900,7 +903,8 @@ static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
}
if (wait_for_exit) {
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
r = unit_watch_timer(UNIT(m), CLOCK_MONOTONIC, true, m->timeout_usec, &m->timer_watch);
if (r < 0)
goto fail;
mount_set_state(m, state);
src/core/service.c
+7 -6
View File
@@ -249,7 +249,7 @@ static void service_handle_watchdog(Service *s) {
return;
}
r = unit_watch_timer(UNIT(s), s->watchdog_usec - offset, &s->watchdog_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->watchdog_usec - offset, &s->watchdog_watch);
if (r < 0)
log_warning("%s failed to install watchdog timer: %s", UNIT(s)->id, strerror(-r));
}
@@ -1599,7 +1599,8 @@ static int service_coldplug(Unit *u) {
k = s->deserialized_state == SERVICE_AUTO_RESTART ? s->restart_usec : s->timeout_start_usec;
if ((r = unit_watch_timer(UNIT(s), k, &s->timer_watch)) < 0)
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, k, &s->timer_watch);
if (r < 0)
return r;
}
}
@@ -1744,7 +1745,7 @@ static int service_spawn(
}
if (timeout && s->timeout_start_usec) {
r = unit_watch_timer(UNIT(s), s->timeout_start_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_start_usec, &s->timer_watch);
if (r < 0)
goto fail;
} else
@@ -1899,7 +1900,7 @@ static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart)
!set_contains(s->restart_ignore_status.signal, INT_TO_PTR(s->main_exec_status.status)))
) {
r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->restart_usec, &s->timer_watch);
if (r < 0)
goto fail;
@@ -2012,7 +2013,7 @@ static void service_enter_signal(Service *s, ServiceState state, ServiceResult f
if (wait_for_exit) {
if (s->timeout_stop_usec > 0) {
r = unit_watch_timer(UNIT(s), s->timeout_stop_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_stop_usec, &s->timer_watch);
if (r < 0)
goto fail;
}
@@ -2262,7 +2263,7 @@ static void service_enter_restart(Service *s) {
/* Don't restart things if we are going down anyway */
log_info("Stop job pending for unit, delaying automatic restart.");
r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->restart_usec, &s->timer_watch);
if (r < 0)
goto fail;
src/core/socket.c
+10 -5
View File
@@ -1146,10 +1146,12 @@ static int socket_coldplug(Unit *u) {
if (s->control_pid <= 0)
return -EBADMSG;
if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
r = unit_watch_pid(UNIT(s), s->control_pid);
if (r < 0)
return r;
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
return r;
}
@@ -1181,10 +1183,12 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
assert(c);
assert(_pid);
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
argv = unit_full_printf_strv(UNIT(s), c->argv);
if (!argv) {
r = -ENOMEM;
goto fail;
}
@@ -1306,7 +1310,8 @@ static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
}
if (wait_for_exit) {
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
socket_set_state(s, state);
src/core/swap.c
+3 -3
View File
@@ -521,7 +521,7 @@ static int swap_coldplug(Unit *u) {
if (r < 0)
return r;
r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
return r;
}
@@ -584,7 +584,7 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
assert(c);
assert(_pid);
r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
@@ -689,7 +689,7 @@ static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
}
if (wait_for_exit) {
r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
src/core/timer.c
+138 -68
View File
@@ -42,7 +42,10 @@ static void timer_init(Unit *u) {
assert(u);
assert(u->load_state == UNIT_STUB);
t->next_elapse = (usec_t) -1;
t->next_elapse_monotonic = (usec_t) -1;
t->next_elapse_realtime = (usec_t) -1;
watch_init(&t->monotonic_watch);
watch_init(&t->realtime_watch);
}
static void timer_done(Unit *u) {
@@ -53,10 +56,15 @@ static void timer_done(Unit *u) {
while ((v = t->values)) {
LIST_REMOVE(TimerValue, value, t->values, v);
if (v->calendar_spec)
calendar_spec_free(v->calendar_spec);
free(v);
}
unit_unwatch_timer(u, &t->timer_watch);
unit_unwatch_timer(u, &t->monotonic_watch);
unit_unwatch_timer(u, &t->realtime_watch);
unit_ref_unset(&t->unit);
}
@@ -81,10 +89,12 @@ static int timer_add_default_dependencies(Timer *t) {
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)
r = unit_add_dependency_by_name(UNIT(t), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true);
if (r < 0)
return r;
if ((r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
r = unit_add_two_dependencies_by_name(UNIT(t), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
if (r < 0)
return r;
}
@@ -98,7 +108,8 @@ static int timer_load(Unit *u) {
assert(u);
assert(u->load_state == UNIT_STUB);
if ((r = unit_load_fragment_and_dropin(u)) < 0)
r = unit_load_fragment_and_dropin(u);
if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
@@ -117,9 +128,11 @@ static int timer_load(Unit *u) {
if (r < 0)
return r;
if (UNIT(t)->default_dependencies)
if ((r = timer_add_default_dependencies(t)) < 0)
if (UNIT(t)->default_dependencies) {
r = timer_add_default_dependencies(t);
if (r < 0)
return r;
}
}
return timer_verify(t);
@@ -128,8 +141,6 @@ static int timer_load(Unit *u) {
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"
@@ -139,12 +150,28 @@ static void timer_dump(Unit *u, FILE *f, const char *prefix) {
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)));
LIST_FOREACH(value, v, t->values) {
if (v->base == TIMER_CALENDAR) {
_cleanup_free_ char *p = NULL;
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),
strna(format_timespan(timespan1, sizeof(timespan1), v->value)));
}
}
}
static void timer_set_state(Timer *t, TimerState state) {
@@ -154,8 +181,10 @@ static void timer_set_state(Timer *t, TimerState state) {
old_state = t->state;
t->state = state;
if (state != TIMER_WAITING)
unit_unwatch_timer(UNIT(t), &t->timer_watch);
if (state != TIMER_WAITING) {
unit_unwatch_timer(UNIT(t), &t->monotonic_watch);
unit_unwatch_timer(UNIT(t), &t->realtime_watch);
}
if (state != old_state)
log_debug("%s changed %s -> %s",
@@ -196,79 +225,117 @@ static void timer_enter_dead(Timer *t, TimerResult f) {
static void timer_enter_waiting(Timer *t, bool initial) {
TimerValue *v;
usec_t base = 0, delay, n;
bool found = false;
usec_t base = 0;
dual_timestamp ts;
bool found_monotonic = false, found_realtime = false;
int r;
n = now(CLOCK_MONOTONIC);
dual_timestamp_get(&ts);
t->next_elapse_monotonic = t->next_elapse_realtime = 0;
LIST_FOREACH(value, v, t->values) {
if (v->disabled)
continue;
switch (v->base) {
if (v->base == TIMER_CALENDAR) {
case TIMER_ACTIVE:
if (state_translation_table[t->state] == UNIT_ACTIVE)
base = UNIT(t)->inactive_exit_timestamp.monotonic;
r = calendar_spec_next_usec(v->calendar_spec, ts.realtime, &v->next_elapse);
if (r < 0)
continue;
if (!initial && v->next_elapse < ts.realtime) {
v->disabled = true;
continue;
}
if (!found_realtime)
t->next_elapse_realtime = v->next_elapse;
else
base = n;
break;
t->next_elapse_realtime = MIN(t->next_elapse_realtime, v->next_elapse);
case TIMER_BOOT:
/* CLOCK_MONOTONIC equals the uptime on Linux */
base = 0;
break;
found_realtime = true;
case TIMER_STARTUP:
base = UNIT(t)->manager->userspace_timestamp.monotonic;
break;
} else {
switch (v->base) {
case TIMER_UNIT_ACTIVE:
case TIMER_ACTIVE:
if (state_translation_table[t->state] == UNIT_ACTIVE)
base = UNIT(t)->inactive_exit_timestamp.monotonic;
else
base = ts.monotonic;
break;
if (UNIT_DEREF(t->unit)->inactive_exit_timestamp.monotonic <= 0)
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 < ts.monotonic) {
v->disabled = true;
continue;
}
base = UNIT_DEREF(t->unit)->inactive_exit_timestamp.monotonic;
break;
if (!found_monotonic)
t->next_elapse_monotonic = v->next_elapse;
else
t->next_elapse_monotonic = MIN(t->next_elapse_monotonic, v->next_elapse);
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");
found_monotonic = true;
}
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) {
if (!found_monotonic && !found_realtime) {
log_debug("%s: Timer is elapsed.", UNIT(t)->id);
timer_set_state(t, TIMER_ELAPSED);
return;
}
delay = n < t->next_elapse ? t->next_elapse - n : 0;
if (found_monotonic) {
char buf[FORMAT_TIMESPAN_MAX];
log_debug("%s: Monotonic timer elapses in %s the next time.", UNIT(t)->id, format_timespan(buf, sizeof(buf), t->next_elapse_monotonic - ts.monotonic));
if ((r = unit_watch_timer(UNIT(t), delay, &t->timer_watch)) < 0)
goto fail;
r = unit_watch_timer(UNIT(t), CLOCK_MONOTONIC, false, t->next_elapse_monotonic, &t->monotonic_watch);
if (r < 0)
goto fail;
} else
unit_unwatch_timer(UNIT(t), &t->monotonic_watch);
if (found_realtime) {
char buf[FORMAT_TIMESTAMP_MAX];
log_debug("%s: Realtime timer elapses at %s the next time.", UNIT(t)->id, format_timestamp(buf, sizeof(buf), t->next_elapse_realtime));
r = unit_watch_timer(UNIT(t), CLOCK_REALTIME, false, t->next_elapse_realtime, &t->realtime_watch);
if (r < 0)
goto fail;
} else
unit_unwatch_timer(UNIT(t), &t->realtime_watch);
timer_set_state(t, TIMER_WAITING);
return;
@@ -289,7 +356,8 @@ static void timer_enter_running(Timer *t) {
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)
r = manager_add_job(UNIT(t)->manager, JOB_START, UNIT_DEREF(t->unit), JOB_REPLACE, true, &error, NULL);
if (r < 0)
goto fail;
timer_set_state(t, TIMER_RUNNING);
@@ -350,7 +418,8 @@ static int timer_deserialize_item(Unit *u, const char *key, const char *value, F
if (streq(key, "state")) {
TimerState state;
if ((state = timer_state_from_string(value)) < 0)
state = timer_state_from_string(value);
if (state < 0)
log_debug("Failed to parse state value %s", value);
else
t->deserialized_state = state;
@@ -473,7 +542,8 @@ static const char* const timer_base_table[_TIMER_BASE_MAX] = {
[TIMER_BOOT] = "OnBootSec",
[TIMER_STARTUP] = "OnStartupSec",
[TIMER_UNIT_ACTIVE] = "OnUnitActiveSec",
[TIMER_UNIT_INACTIVE] = "OnUnitInactiveSec"
[TIMER_UNIT_INACTIVE] = "OnUnitInactiveSec",
[TIMER_CALENDAR] = "OnCalendar"
};
DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);
src/core/timer.h
+11 -5
View File
@@ -24,6 +24,7 @@
typedef struct Timer Timer;
#include "unit.h"
#include "calendarspec.h"
typedef enum TimerState {
TIMER_DEAD,
@@ -41,18 +42,21 @@ typedef enum TimerBase {
TIMER_STARTUP,
TIMER_UNIT_ACTIVE,
TIMER_UNIT_INACTIVE,
TIMER_CALENDAR,
_TIMER_BASE_MAX,
_TIMER_BASE_INVALID = -1
} TimerBase;
typedef struct TimerValue {
TimerBase base;
bool disabled;
clockid_t clock_id;
usec_t value;
CalendarSpec *calendar_spec;
usec_t next_elapse;
LIST_FIELDS(struct TimerValue, value);
TimerBase base;
bool disabled;
} TimerValue;
typedef enum TimerResult {
@@ -66,12 +70,14 @@ struct Timer {
Unit meta;
LIST_HEAD(TimerValue, values);
usec_t next_elapse;
usec_t next_elapse_monotonic;
usec_t next_elapse_realtime;
TimerState state, deserialized_state;
UnitRef unit;
Watch timer_watch;
Watch monotonic_watch;
Watch realtime_watch;
TimerResult result;
};
src/core/unit.c
+5 -5
View File
@@ -1560,7 +1560,7 @@ void unit_unwatch_pid(Unit *u, pid_t pid) {
hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u);
}
int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
int unit_watch_timer(Unit *u, clockid_t clock_id, bool relative, usec_t usec, Watch *w) {
struct itimerspec its;
int flags, fd;
bool ours;
@@ -1580,7 +1580,7 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
} else if (w->type == WATCH_INVALID) {
ours = true;
fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
fd = timerfd_create(clock_id, TFD_NONBLOCK|TFD_CLOEXEC);
if (fd < 0)
return -errno;
} else
@@ -1588,7 +1588,7 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
zero(its);
if (delay <= 0) {
if (usec <= 0) {
/* Set absolute time in the past, but not 0, since we
* don't want to disarm the timer */
its.it_value.tv_sec = 0;
@@ -1596,8 +1596,8 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
flags = TFD_TIMER_ABSTIME;
} else {
timespec_store(&its.it_value, delay);
flags = 0;
timespec_store(&its.it_value, usec);
flags = relative ? 0 : TFD_TIMER_ABSTIME;
}
/* This will also flush the elapse counter */
src/core/unit.h
+1 -1
View File
@@ -484,7 +484,7 @@ void unit_unwatch_fd(Unit *u, Watch *w);
int unit_watch_pid(Unit *u, pid_t pid);
void unit_unwatch_pid(Unit *u, pid_t pid);
int unit_watch_timer(Unit *u, usec_t delay, Watch *w);
int unit_watch_timer(Unit *u, clockid_t, bool relative, usec_t usec, Watch *w);
void unit_unwatch_timer(Unit *u, Watch *w);
int unit_watch_bus_name(Unit *u, const char *name);