Messages in this thread | | | Date | Sat, 02 Jan 2010 15:04:20 +0100 | From | Daniel Borkmann <> | Subject | Re: userspace notification from module |
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Hi Bartłomiej,
Bartłomiej Zimoń wrote: > Dnia 2 stycznia 2010 13:36 Daniel Borkmann <llug.dan@googlemail.com> napisał(a): > I will explain more what i'm going to do. > The idea is simple. Kernel before suspend/resume sends notification to > registered kernel objects. So i have written small module to register > there and want now pass these data to /dev/file. It is 1byte so not a big deal. > > I'm searching now for notification about new byte in buffer, as it is almost > clear for async: http://www.xml.com/ldd/chapter/book/ch05.html#t4 > but for sync still haven't find.
This sounds very interesting... a "hack" could be the following:
Register your pids to the kernel module, e.g. via ioctl, and if the (intra-kernel) notification will be delivered to your module you just send a signal to your registered processes via kill_proc_info(). Guess this is at least better than polling a file or sth similar.
I guess netlink could be the "cleaner" solution, but with more overhead?!
Cheers, Daniel
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