svn commit: r265132 - in head: share/man/man4 sys/dev/null

[Ian Lepore]

On Wed, 2014-04-30 at 17:22 +0100, Steven Hartland wrote:
> ----- Original Message ----- 
> From: "Ian Lepore" <ian at FreeBSD.org>
> To: "Eitan Adler" <eadler at FreeBSD.org>
> Cc: <src-committers at FreeBSD.org>; <svn-src-all at FreeBSD.org>; <svn-src-head at FreeBSD.org>
> Sent: Wednesday, April 30, 2014 3:48 PM
> Subject: Re: svn commit: r265132 - in head: share/man/man4 sys/dev/null
> 
> 
> > On Wed, 2014-04-30 at 06:20 +0000, Eitan Adler wrote:
> >> Author: eadler
> >> Date: Wed Apr 30 06:20:48 2014
> >> New Revision: 265132
> >> URL: http://svnweb.freebsd.org/changeset/base/265132
> >> 
> >> Log:
> >>   Add a /dev/full device.
> >>   
> >>   /dev/full is similar to /dev/zero except it always returns
> >>   ENOSPC when you attempt to write to it.
> >>   
> > 
> > For some reason this reminded me of something I've been wanting for a
> > while but never get around to writing... /dev/ones, it's just
> > like /dev/zero except it returns 0xff bytes.  Useful for dd'ing to wipe
> > out flash-based media.
> 
> Surely for that you want camcontrol security ...?
> 
>     Regards
>     Steve

I have no idea what that is, but given that it has "security" in the
name, it's almost certainly NOT what I want in any way shape or form.
Shocking as it may be, some people are just not obsessed with security,
for good reason.  It just isn't a consideration in any way in my day to
day activities.  

When I want to make an sdcard, or some portion thereof, look
empty/virgin/new-from-factory for testing on an embedded system, that
has nothing to do with security, and everything to do with just exactly
what I asked for:  something that writes all-ones-bits.

Besides, cam and sdcards don't play in the same sandboxes.

-- Ian