Re: How can Emacs get a unique ID per Linux reboot?

Richard Gooch (rgooch@atnf.csiro.au)
Tue, 1 Jun 1999 15:20:28 +1000

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H. Peter Anvin writes:
> Richard Gooch wrote:
> >
> > H. Peter Anvin writes:
> > > Richard Gooch wrote:
> > > >
> > > > H. Peter Anvin writes:
> > > > > Get the current uptime from /proc/uptime and subtract that from the
> > > > > current time.
> > > >
> > > > Won't that foul up if the system is suspended (system clock is
> > > > restored from hwclock on resume)?
> > > > And probably also when settimeofday() is called?
> > >
> > > No, and yes, respectively.
> >
> > ??? AFAIK, /proc/uptime stops ticking over when the system is
> > suspended. However, since the current time is "restored" after a
> > resume, the two values will not track. The computed "boot time" will
> > drift forward by as many seconds as the system was suspended.
> > Is this not correct?
>
> If so, then that's a bug in /proc/uptime IMNSHO.

Well, that's what happens. I'm not sure if it is a bug, though. One
could argue that the system is not up when suspended.

Regards,

Richard....

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