Messages in this thread | | | Date | Mon, 06 Oct 2003 20:21:23 +0200 | From | Hans-Georg Thien <> | Subject | Re: getting timestamp of last interrupt? |
| |
Richard B. Johnson wrote: > On Sat, 4 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. > Hello Richard, - It seems, that I should be more precise about what I exactly mean...
I'm writing a kernel mode device driver (mouse).
In that device driver I need the timestamp of the last event for another kernel mode device (keyboard).
I do not care if that timestamp is in jiffies or in gettimeofday() format or whatever format does exist in the world. I am absolutely sure I can convert it somehow to fit my needs.
But since it is a kernel mode driver it can not -AFAIK- use the signal() syscall.
-Hans
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |