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Date:      Sun, 6 Dec 2015 17:49:58 -0200
From:      =?utf-8?B?THXDrXM=?= Fernando Schultz Xavier da Silveira <schultz@ime.usp.br>
To:        freebsd-questions@freebsd.org
Subject:   Re: OSS in jail
Message-ID:  <20151206194958.GB4044@hpmini>
In-Reply-To: <CAA2O=b_isQOHepigMgDyDGtOidpbYkLOmvEayCbETfLEbUsDKA@mail.gmail.com>
References:  <20151206194401.GA3860@hpmini> <CAA2O=b_isQOHepigMgDyDGtOidpbYkLOmvEayCbETfLEbUsDKA@mail.gmail.com>

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Sorry, I meant write-only mode.

On Sun, Dec 06, 2015 at 09:45:12PM +0200, Anton Sayetsky wrote:
> 2015-12-06 21:44 GMT+02:00 Luís Fernando Schultz Xavier da Silveira
> <schultz@ime.usp.br>:
> > Hi,
> >
> > I would like one of my jails to have the ability to play back sound,
> > but not to record it. As I understand, sound is played back by writing
> > to /dev/dsp and recorded by reading from it. Hence, placing the /dev/dsp
> > device (and /dev/dsp[0-9]* devices) in the jail via devfs.rules is not
> > a solution since the jail superuser can override permissions on these
> > devices and even read from them when they lack read permission.
> >
> > Is there a way to give a device to a jail in read-only mode?
> How do you want to write sound output to read-only device?
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