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DragonFly kernel List (threaded) for 2005-04
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Re: what about adding EVFILT_OOB to kqueue

From: Sepherosa Ziehau <sepherosa@xxxxxxxxx>
Date: Thu, 28 Apr 2005 16:19:34 +0800

OK, I see.  Thank you for pointing out that 2400 stuff :-)

On 4/28/05, Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx> wrote:
> :current kqueue can't report oob data arrival precisely,
> :what about adding EVFILT_OOB filter to kqueue?  Any suggestion?
> :
> :--
> :Live Free or Die
>     About the only thing OOB data is used for is propogating signals
>     over terminal sessions (in order to bypass potentially thousands
>     of bytes of data that are otherwise backed up trying to get out
>     a 2400 baud serial port).
>     In otherwords, its a throwback to an earlier era.  Terminal
>     programs (rlogin, telnet) still use OOB data, but those are
>     about the only programs that do.  I don't even think SSH uses
>     OOB data.
>     I don't think it's worth adding a KQUEUE interface to separate OOB
>     data from non-OOB data.  Its unlikely that other BSDs would adopt
>     the feature (I don't even think we should, obviously!), and that
>     pretty much means that no programs would ever use it.  It's far
>     better to open a whole second (TCP) connection and shove your out
>     of band data over that then it is to try to multiplex it on a
>     single connection.
>                                         -Matt
>                                         Matthew Dillon
>                                         <dillon@xxxxxxxxxxxxx>

Live Free or Die

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