Re: getting timestamp of last interrupt?

[Richard B. Johnson]

On Sat, 4 Oct 2003, Hans-Georg Thien wrote:

> Richard B. Johnson wrote:
> > On Thu, 2 Oct 2003, Hans-Georg Thien wrote:
> >
> >
> >>I am looking for a possibility to read out the last timestamp when an
> >>interrupt has occured.
> >>
> >>e.g.: the user presses a key on the keyboard. Where can I read out the
> >>timestamp of this event?
> >
> >
> > You can get A SIGIO signal for every keyboard, (or other input) event.
> > What you do with it is entirely up to you. Linux/Unix doesn't have
> > "callbacks", instead it has signals. It also has select() and poll(),
> > all useful for handling such events. If you want a time-stamp, you
> > call gettimeofday() in your signal handler.
> >
> Thanks a lot Richard,
>
> ... but ... can I use signals in kernel mode?

Well you talked about the user pressing a key and getting
a time-stamp as a result. If you need time-stamps
inside the kernel, i.e, a module, then you can call
the kernel's do_gettimeofday() function.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.


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