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Subject: Re: RFC: deprecating/removing the legacy mode of devpts
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 11 Apr 2012 19:48:44 -0700
To: Al Viro <viro@ZenIV.linux.org.uk>
CC: Kay Sievers <kay@vrfy.org>, "Ted Ts'o" <tytso@mit.edu>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Konstantin Khlebnikov <khlebnikov@openvz.org>,
        Greg Kroah-Hartman <gregkh@linux-foundation.org>,
        Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
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The symlink support is at least 3 years old, probably more.

Al Viro <viro@ZenIV.linux.org.uk> wrote:

>On Wed, Apr 11, 2012 at 06:56:10PM -0700, H. Peter Anvin wrote:
>> Just replace /dev/ptmx with a pts/ptmx symlink... something that
>works already.
>
>It does *not* work for static setups - try to boot stock 3.3 on the
>root
>fs with such a symlink and you've got a dangling symlink.  Have fun
>trying to bisect something with repeated jumps back and forth across
>the
>point where such change goes in...
>
>It will also do no good on setups like e.g. debian/stable, with stock
>udev - you need to edit /lib/udev/rules.d/50-udev-default.rules to get
>that link created, with quite a bit of interesting kludgery to avoid
>the
>same kind of crap (i.e. setup breaking when you boot an older kernel).

-- 
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