Hi,
You can write a netlink socket interface between your char
driver and userspace program. User space program can be made to wait in
"recvfrom" system call. Whenever even number comes in "i", a netlink
messages can be send to user space program.
-- Paraneetharan C
2009/2/3 Sandeep K Sinha <[email protected]>
> On Tue, Feb 3, 2009 at 6:59 AM, Pei Lin <[email protected]> wrote:
> > why not use copy_from_user and copy_to_user?
> >
>
> DIdn't understand what you meant, but the question is regarding a
> signal not data?
> Am I missing something ???
>
> > 2009/2/1 Sandeep K Sinha <[email protected]>:
> >> Write a daemon in userspace which runs in background and continuously
> >> send ioctl's to your driver and gets the value of i.
> >> If the value of i becomes even, you can write your desired code.
> >>
> >> Is this what you wanted ?
> >>
> >> On Sat, Jan 31, 2009 at 2:53 PM, rishi agrawal <[email protected]>
> wrote:
> >>> Hello Everyone,
> >>>
> >>> I have a char device which when gets ioctl case 'a' starts a for loop
> with
> >>> index ' i '.
> >>>
> >>> I want to send the value of index ' i ' to user space whenever ' i ' is
> >>> even.
> >>>
> >>> I want some thing like the kernel space code of char device should send
> a
> >>> variable and also a 'signal' that it has send a value.
> >>>
> >>> How can it be done ?
> >>>
> >>> Its something like Pipes
> >>>
> >>> --
> >>> Regards,
> >>> Rishi B. Agrawal
> >>>
> >>>
> >>
> >>
> >>
> >> --
> >> Regards,
> >> Sandeep.
> >>
> >>
> >>
> >>
> >>
> >>
> >> "To learn is to change. Education is a process that changes the
> learner."
> >>
> >> --
> >> To unsubscribe from this list: send an email with
> >> "unsubscribe kernelnewbies" to [email protected]
> >> Please read the FAQ at http://kernelnewbies.org/FAQ
> >>
> >>
> >
>
>
>
> --
> Regards,
> Sandeep.
>
>
>
>
>
>
> "To learn is to change. Education is a process that changes the learner."
>
> --
> To unsubscribe from this list: send an email with
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> Please read the FAQ at http://kernelnewbies.org/FAQ
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>
