Re: ARM rtc problem

[Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>]

On Mon, Apr 16, 2007 at 02:24:14PM +0530, Manish RATHI wrote:
> Hi,
> To set a alarm thru rtc, ioctl RTC_ALM_SET is used.
> In above ioctl implementation, in file arm/common/rtctime.c , alrm structure is initialized
> As follows:
> 
>       alrm.enabled = 0;
>                 alrm.pending = 0;
>                 alrm.time.tm_mday = -1;
>                 alrm.time.tm_mon = -1;
>                 alrm.time.tm_year = -1;
>                 alrm.time.tm_wday = -1;
>                 alrm.time.tm_yday = -1;
>                 alrm.time.tm_isdst = -1;
>                 ret = rtc_set_alarm(ops, &alrm);
> 
>  alrm is time at which alarm should be matured. 
> Why this structure is filled with invalid values?
> I think that this should not be initialized with invalid values.

-1 is a wildcard - the RTC_ALM_SET call only sets the time of day when
the alarm fires (since that's the behaviour of MC146818 RTCs which is
where this ioctl came from).

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