On 10/17/2011 07:05 PM, Victor Alvidrez wrote:
> Hello.
>
> I am trying to a write simple program that can listen for interrupts
> produced by the keyboard in user-space.
> At first I tried to do this using the native API, however I figured out
> that this functionality is turned off by default. So I decided to use
> the rtdm API.
>
> I wrote the code using the rtdm_irq_* related functions/variables and
> included the <rtdm/rtdm.h> header file.
>
> However, upon trying to compile I get a bunch of undefined reference
> errors. I read through the rtdm.h file and found that there are no
> definitions of rtdm_irq* related variables or function declarations.
> All of these things are defined in <rtdm/rtdm_driver.h>, which you
> cannot include in non-kernel code.
>
> I guess it is pretty obvious that I cannot do this from user space...
> but maybe I am missing something?
Yes.
>
> The rtdm API manual includes a "Environments:This service can be called
> from:" section. And the function "rtdm_irq_request" lists "User-space
> task (RT, non-RT)". Doesn't this mean that it can be called from a
> user-space program?
>
> Thanks for any info you can provide.
This means that it can be called from the context of an ioctl emitted by
a user-space task (either RT or non RT). The RTDM skin is a kernel-only
skin.
--
Gilles.
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