Re: [PATCH] [RFCv2] notify userspace about time changes

[Peter Zijlstra]

On Wed, 2010-08-18 at 16:53 -0700, Andrew Morton wrote:
> 
> 
> Such applications might be better served via a wake-me-at-this-time
> syscall instead of a sleep-me-for-this-long syscall.  Although such a
> thing is less general.
> 
We have timer_create(.clockid = CLOCK_REALTIME) for such things, no?

> > +                  fd = open("/sys/kernel/time_notify", O_WRONLY);
> > +                  fdprintf(fd, "%d 1 0 1 1", efd);
> 
> why not
> 
>                 sys_time_notify(efd, 1, 0, 1, 1);

And then there is the /dev/time proposal from Plan9:

  http://lkml.org/lkml/2009/3/11/363

Their proposal was to add a poll() method to the device which would wake
on every change in time.
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