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time-util: introduce common implementation of TFD_TIMER_CANCEL_ON_SET client code

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We now use pretty much the same code at three places, let's unify that.
This commit is contained in:
Lennart Poettering 2018-05-29 12:55:33 +02:00
parent bbf5fd8e41
commit 4f811d27d6
5 changed files with 40 additions and 44 deletions
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24
src/basic/time-util.c
View File

@ -1463,3 +1463,27 @@ bool in_utc_timezone(void) {
return timezone == 0 && daylight == 0;
}
int time_change_fd(void) {
/* We only care for the cancellation event, hence we set the timeout to the latest possible value. */
static const struct itimerspec its = {
.it_value.tv_sec = TIME_T_MAX,
};
_cleanup_close_ int fd;
assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX));
/* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever CLOCK_REALTIME makes a jump relative to
* CLOCK_MONOTONIC. */
fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
if (fd < 0)
return -errno;
if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0)
return -errno;
return TAKE_FD(fd);
}

2
src/basic/time-util.h
View File

@ -185,3 +185,5 @@ static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
#else
#error "Yuck, time_t is neither 4 nor 8 bytes wide?"
#endif
int time_change_fd(void);

20
src/core/manager.c
View File

@ -353,14 +353,7 @@ static void manager_close_idle_pipe(Manager *m) {
static int manager_setup_time_change(Manager *m) {
int r;
/* We only care for the cancellation event, hence we set the
* timeout to the latest possible value. */
struct itimerspec its = {
.it_value.tv_sec = TIME_T_MAX,
};
assert(m);
assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX));
if (m->test_run_flags)
return 0;
@ -368,18 +361,9 @@ static int manager_setup_time_change(Manager *m) {
m->time_change_event_source = sd_event_source_unref(m->time_change_event_source);
m->time_change_fd = safe_close(m->time_change_fd);
/* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever
* CLOCK_REALTIME makes a jump relative to CLOCK_MONOTONIC */
m->time_change_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
m->time_change_fd = time_change_fd();
if (m->time_change_fd < 0)
return log_error_errno(errno, "Failed to create timerfd: %m");
if (timerfd_settime(m->time_change_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) {
log_debug_errno(errno, "Failed to set up TFD_TIMER_CANCEL_ON_SET, ignoring: %m");
m->time_change_fd = safe_close(m->time_change_fd);
return 0;
}
return log_error_errno(m->time_change_fd, "Failed to create timer change timer fd: %m");
r = sd_event_add_io(m->event, &m->time_change_event_source, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m);
if (r < 0)

26
src/time-wait-sync/time-wait-sync.c
View File

@ -115,16 +115,15 @@ static int inotify_handler(sd_event_source *s,
return 0;
}
static int clock_state_update(ClockState *sp,
sd_event *event) {
static const struct itimerspec its = {
.it_value.tv_sec = TIME_T_MAX,
};
int r;
struct timex tx = {};
static int clock_state_update(
ClockState *sp,
sd_event *event) {
char buf[MAX((size_t)FORMAT_TIMESTAMP_MAX, STRLEN("unrepresentable"))];
usec_t t;
struct timex tx = {};
const char * ts;
usec_t t;
int r;
clock_state_release_timerfd(sp);
@ -151,19 +150,14 @@ static int clock_state_update(ClockState *sp,
* it synchronized. When an NTP source is selected it sets the clock again with clock_adjtime(2) which marks it
* synchronized and also touches /run/systemd/timesync/synchronized which covers the case when the clock wasn't
* "set". */
r = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
r = time_change_fd();
if (r < 0) {
log_error_errno(errno, "Failed to create timerfd: %m");
log_error_errno(r, "Failed to create timerfd: %m");
goto finish;
}
sp->timerfd_fd = r;
r = timerfd_settime(sp->timerfd_fd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &its, NULL);
if (r < 0) {
log_error_errno(errno, "Failed to set timerfd conditions: %m");
goto finish;
}
r = adjtimex(&tx);
if (r < 0) {
log_error_errno(errno, "Failed to read adjtimex state: %m");

12
src/timesync/timesyncd-manager.c
View File

@ -224,11 +224,6 @@ static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents
/* wake up when the system time changes underneath us */
static int manager_clock_watch_setup(Manager *m) {
struct itimerspec its = {
.it_value.tv_sec = TIME_T_MAX
};
int r;
assert(m);
@ -236,12 +231,9 @@ static int manager_clock_watch_setup(Manager *m) {
m->event_clock_watch = sd_event_source_unref(m->event_clock_watch);
safe_close(m->clock_watch_fd);
m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
m->clock_watch_fd = time_change_fd();
if (m->clock_watch_fd < 0)
return log_error_errno(errno, "Failed to create timerfd: %m");
if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0)
return log_error_errno(errno, "Failed to set up timerfd: %m");
return log_error_errno(m->clock_watch_fd, "Failed to create timerfd: %m");
r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m);
if (r < 0)