util-linux-ng hwclock/rtc.c:
#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
/* Not all alpha kernels reject RTC_UIE_ON, but probably they should. */
rc = -1;
errno = EINVAL;
#else
rc = ioctl(rtc_fd, RTC_UIE_ON, 0);
#endif
Looks like a legacy. I think RTC framework can emulate RTC_UIE_*. At
least on my x86_64 (rtc_cmos) with recent kernel it works. Is there
any exclusion of an architecture/driver?
Unfortunately, hwclock(8) uses a busy wait when RTC_UIE_ON is not
available...
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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