Subject: Re: [suspend/resume] Re: userspace notification from module
From: Andy Walls <awalls@radix.net>
To: Daniel Borkmann <danborkmann@googlemail.com>
Cc: =?UTF-8?Q?Bart=C5=82omiej_Zimo=C5=84?= <uzi18@o2.pl>,
       linux-kernel@vger.kernel.org
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Date: Sat, 02 Jan 2010 10:40:24 -0500
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On Sat, 2010-01-02 at 16:15 +0100, Daniel Borkmann wrote:
> Hi Bartłomiej,
> 
> 2010/1/2 Bartłomiej Zimoń <uzi18@o2.pl>
> >
> > This looks like more simple and could be good, after all i think about sending this
> > module here to add to kernel. So if this solution could be ok i will start to code this part.
> >
> > Question is now what signal to choose to not terminate process and to be compatible
> > with rest of Linux kernel?
> 
> Have a look at linux/signal.h. There's a section for non-POSIX
> signals. May be you
> could add a SIGSUS or sth similar into that list with a free signal
> number to stay
> compatible with the rest of the numbers.
> 
> Cool thing is that you now will have a kind of "observer" principle:
> Don't call us, we call you ;)


Why not:

a. write a module that implements a device node that supports poll(),
and

b. have a user space process select() on the fd for read or exception
notification

?

Regards,
Andy

> Cheers,
> Daniel Borkmann


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