Re: strange message before sending mail

On 8/19/26 10:51, Ian Collier via Mutt-dev wrote:
> On Wed, Aug 19, 2026 at 01:43:57PM +0200, Vincent Lefevre wrote:
>> This is fine. However, I can reproduce the issue many times
>> every second with
> [redacted]
>
> That's bizarre.  So it seems the output of time(2) is delayed by
> at least one jiffy with respect to the real time.  Vide:
>
>
> #include <stdio.h>
> #include <time.h>
> #include <sys/time.h>
>
> int main(void) {
>    struct timeval tv;
>    time_t t;
>    while (1) {
>      gettimeofday(&tv, NULL);
>      t = time(NULL);
>      if (t < tv.tv_sec)
>        printf("%ld < %ld.%06d\n", (long)t, (long)tv.tv_sec, (int)tv.tv_usec);
>    }
> }
>
>
> This produces output on every system I've tested so far, from Centos7
> (3.10.0) upwards.  But the generic 6.8.0 kernel on Ubuntu 24.04 (and
> all earlier systems) does not produce output for the test that touches a
> file.  Whereas Ubuntu 24.04 systems running an OEM kernel (6.17.0) and
> all Fedora systems do produce output from both tests.
>
> This seems to mean that the Linux kernel has changed something about
> how the time is obtained when touching a file; but ultimately it is
> the time(2) call that is to blame.
>
> Ian Collier.
I can confirm the behavior you describe in Ubuntu 24.04 (6.8.0 kernel).

For what it's worth, the behavior is not reproducible in FreeBSD.