Re: Async user space notification from kernel?

H. Peter Anvin (hpa@transmeta.com)
27 Aug 1999 06:35:32 GMT

Followup to: <19990826120820.A5360@xmission.com>
By author: Erik Andersen <andersen@xmission.com>
In newsgroup: linux.dev.kernel
>
> On Thu, Aug 26, 1999 at 12:54:35PM -0400, Jeff Garzik wrote:
> > Erik Andersen wrote:
> > > Select(2) on /proc is indeed disappointing -- it does nothing
> > > useful.
> >
> > I still wonder if this is because 'read' is the only proc operation that
> > is filled in... All of the net routines share
> > 'proc_net_inode_operations'.
> >
> > Jeff
>
> Ok, I follow you now -- select(2) depends on certain fs file
> operations that no /proc entries currently provide. By adjusting the
> file_operations, and providing some needed magic, I could indeed use
> select on a /proc entry to get async event notification to user space.
> That would be a very elegant solution.
>
> Any hints as to what file_ops are needed to support select?
> Clearly read and write are not sufficient. flush? poll?
>

poll.

-hpa

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!


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