if (fd < 0)
return -errno;
- if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0)
- return -errno;
+ if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) >= 0)
+ return TAKE_FD(fd);
+
+ /* So apparently there are systems where time_t is 64bit, but the kernel actually doesn't support
+ * 64bit time_t. In that case configuring a timer to TIME_T_MAX will fail with EOPNOTSUPP or a
+ * similar error. If that's the case let's try with INT32_MAX instead, maybe that works. It's a bit
+ * of a black magic thing though, but what can we do?
+ *
+ * We don't want this code on x86-64, hence let's conditionalize this for systems with 64bit time_t
+ * but where "long" is shorter than 64bit, i.e. 32bit archs.
+ *
+ * See: https://github.com/systemd/systemd/issues/14362 */
+
+#if SIZEOF_TIME_T == 8 && ULONG_MAX < UINT64_MAX
+ if (ERRNO_IS_NOT_SUPPORTED(errno)) {
+ static const struct itimerspec its32 = {
+ .it_value.tv_sec = INT32_MAX,
+ };
+
+ if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its32, NULL) >= 0)
+ return TAKE_FD(fd);
+ }
+#endif
- return TAKE_FD(fd);
+ return -errno;
}