linux-kernel - RE: [PATCH] tty: Fix TIOCGPTPEER ioctl definition

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Date:   Tue, 11 Jul 2017 14:23:29 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Gleb Fotengauer-Malinovskiy' <glebfm@...linux.org>,
        Aleksa Sarai <asarai@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        Valentin Rothberg <vrothberg@...e.com>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Dmitry V. Levin" <ldv@...linux.org>, Jiri Slaby <jslaby@...e.com>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH] tty: Fix TIOCGPTPEER ioctl definition

From: Linuxppc-dev  Gleb Fotengauer-Malinovskiy
> Sent: 11 July 2017 01:12
> This ioctl does nothing to justify an _IOC_READ or _IOC_WRITE flag
> because it doesn't copy anything from/to userspace to access the
> argument.
> 
> Fixes: 54ebbfb1 ("tty: add TIOCGPTPEER ioctl")
...
> -#define TIOCGPTPEER	_IOR('T', 0x41, int) /* Safely open the slave */
> +#define TIOCGPTPEER	_IO('T', 0x41) /* Safely open the slave */

This is a user API change. When was the ioctl added?

	David