linux-kernel - RE: select-like implementation for kernel sockets

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Message-ID: <EF8DFB1B64FF0A43AB00555B8E2717B104973BF7@aclmsg.corp.audiocodes.com>
Date:	Mon, 7 May 2007 11:04:06 +0300
From:	"Eitan Richardson" <Eitan.Richardson@...iocodes.com>
To:	"kalash nainwal" <kalash.nainwal@...il.com>,
	"Robert Hancock" <hancockr@...w.ca>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: RE: select-like implementation for kernel sockets

Hi,

Thanks for the tip.
I understand sk_data_ready is a callback that is called when there is
data ready in the socket.

Is it safe to override it?
Do you have an example?

Thanks,
Eitan.

-----Original Message-----
From: kalash nainwal [mailto:kalash.nainwal@...il.com] 
Sent: Monday, May 07, 2007 9:57 AM
To: Robert Hancock
Cc: Eitan Richardson; linux-kernel
Subject: Re: select-like implementation for kernel sockets
Importance: Low

On 5/6/07, Robert Hancock <hancockr@...w.ca> wrote:
> eitanr@...iocodes.com wrote:
> > Hi,
> >
> > I'm using kernel sockets to Tx and Rx UDP packets between my
hardware
> > device (DSP) to the external network (this is part of a VoIP
> > implementation). The motivation for using kernel sockets rather than
> > user-space sockets is to avoid the copying of data between kernel
and
> > user spaces.
>
> I think we are zero-copy in many cases for UDP these days, so this
> doesn't necessarily buy you anything..
>
> >
> > I have no problems on the Tx side (I simply call sock_sendmsg on one
> > of the sockets), but for the Rx side I want to listen-in on multiple
> > sockets in blocking mode (I don't want to use polling).
> >
> > Is there a way to listen-in on multiple kernel sockets from one
kernel
> > thread? In the user space I would have used select(), but I am not
> > familiar with a similar solution for the kernel space.
> >

implementing (sock->)sk_data_ready() might serve your purpose?

> > Thanks,
> > Eitan.
> >
> > Eitan Richardson
> > AudioCodes Ltd.
> >
>
> --
> Robert Hancock      Saskatoon, SK, Canada
> To email, remove "nospam" from hancockr@...pamshaw.ca
> Home Page: http://www.roberthancock.com/
>
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