Re: strange message before sending mail

Yes, you're correct. In glibc 2.44, time() uses a macro which is defined 
as CLOCK_REALTIME_COARSE.

The definition of gettimeofday(), on the other hand, refers directly to 
CLOCK_REALTIME, just as you note.

On 8/19/26 13:43, Ian Collier via Mutt-dev wrote:
> On Wed, Aug 19, 2026 at 07:01:59PM +0200, Steffen Nurpmeso wrote:
>> Musl impl is
>>    #include "syscall.h"
>>
>>    time_t time(time_t *t)
>>    {
>>            struct timespec ts;
>>            __clock_gettime(CLOCK_REALTIME, &ts);
>>            if (t) *t = ts.tv_sec;
>>            return ts.tv_sec;
>>    }
>
> I believe glibc uses CLOCK_REALTIME_COARSE in that syscall (but
> CLOCK_REALTIME for the gettimeofday(2) function).
>
> If I understand correctly, CLOCK_REALTIME asks the clock hardware
> whereas CLOCK_REALTIME_COARSE fetches a stored value that is updated
> once per jiffy.
>
> On modern systems HZ=1000, but my testing showed a delay of up to 1.53ms
> on x86_64 and 1.08ms on arm64.
>
> Ian Collier.