Re: Problem of workqueue

[rohan puri <rohan.puri15@xxxxxxxxx>]

On Fri, May 4, 2012 at 10:55 AM, 夏业添 <summerxyt@xxxxxxxxx> wrote:

Hi rohan,

I google fanotify and find it's a notification mechanism. My
understanding is that fanotify can know fd being open, close, read,
write, but transfer data between user space and kernel is out of its
ability. If I'm wrong please tell me.

The only reason I choose netlink to send data to user space is to
notify user space process there is  data, and avoid user space process
do some polling job to check if there is data in kernel. Does fanotify
or other method can do such thing?

Thanks a lot!

2012/5/4 rohan puri <rohan.puri15@xxxxxxxxx>:

>
> Hi,
> To send data from kernel space and user-space see kernel's notification
> mechanism like fanotify which works on by creating an anonymous fd in the
> user-space process's context which then might perform normal read() and
> write() call to receive and send data to kernel.
>
> - Rohan

To notify itself requires some data transfer. You can easily implement your own mechanism similar to fanotify which would contain you_fops (file operations) from which you could transfer data. Yes, user process needs to do polling to check whether data is available on the fd or not.

- Rohan

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