linux-kernel - Re: [RFC] tty: n_tty -- Add new TIOCPEEKRAW ioctl to peek unread data

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Message-ID: <20160313103523.GP1989@uranus.lan>
Date:	Sun, 13 Mar 2016 13:35:23 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrey Vagin <avagin@...tuozzo.com>,
	Konstantin Khorenko <khorenko@...tuozzo.com>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Pavel Emelianov <xemul@...tuozzo.com>
Subject: Re: [RFC] tty: n_tty -- Add new TIOCPEEKRAW ioctl to peek unread data

On Sun, Mar 13, 2016 at 11:14:46AM +0100, Jiri Slaby wrote:
> On 03/12/2016, 03:18 PM, Cyrill Gorcunov wrote:
> > --- linux-ml.git.orig/include/uapi/asm-generic/ioctls.h
> > +++ linux-ml.git/include/uapi/asm-generic/ioctls.h
> > @@ -77,6 +77,7 @@
> >  #define TIOCGPKT	_IOR('T', 0x38, int) /* Get packet mode state */
> >  #define TIOCGPTLCK	_IOR('T', 0x39, int) /* Get Pty lock state */
> >  #define TIOCGEXCL	_IOR('T', 0x40, int) /* Get exclusive mode state */
> > +#define TIOCPEEKRAW	_IOR('T', 0x41, void *)
> 
> Hi, this is not 32/64bit compatible and would need a compat ioctl number
> and a wrapper. Since it is char *, could you make it just 'char'?

Hi Jiri, sure, thanks! Lets wait for more feedback, maybe there some
other more elegant solution possible, which I failed to invent.

	Cyrill