CLOCK_BOOTTIME is not supported by timerfd on older kernels, so for the time beeing,
use this helper instead which will fallback to CLOCK_MONOTONIC if CLOCK_BOOTTIME is
not supported.
#include <time.h>
#include <string.h>
#include <sys/timex.h>
+#include <sys/timerfd.h>
#include "util.h"
#include "time-util.h"
return true;
}
+
+clockid_t clock_boottime_or_monotonic(void) {
+ static clockid_t clock = -1;
+ int fd;
+
+ if (clock != -1)
+ return clock;
+
+ fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (fd < 0)
+ clock = CLOCK_MONOTONIC;
+ else {
+ safe_close(fd);
+ clock = CLOCK_BOOTTIME;
+ }
+
+ return clock;
+}
int get_timezones(char ***l);
bool timezone_is_valid(const char *name);
+
+clockid_t clock_boottime_or_monotonic(void);