linux-kernel - Re: RFC: deprecating/removing the legacy mode of devpts

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Message-ID: <fe934e2f-3482-4c23-9091-8c8debf94794@email.android.com>
Date:	Wed, 11 Apr 2012 19:48:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Kay Sievers <kay@...y.org>, "Ted Ts'o" <tytso@....edu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: RFC: deprecating/removing the legacy mode of devpts

The symlink support is at least 3 years old, probably more.

Al Viro <viro@...IV.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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