linux-kernel - Re: [RFC] tty: Add get- ioctls to fetch tty status

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Message-ID: <20120913135131.5b251797@pyramind.ukuu.org.uk>
Date:	Thu, 13 Sep 2012 13:51:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [RFC] tty: Add get- ioctls to fetch tty status

> +static int pty_get_lock(struct tty_struct *tty, int __user *arg)
> +{
> +	int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
> +	if (put_user(locked, arg))
> +		return -EFAULT;

Now explain exactly how this doesn't race with another thread chanigng
the lock setting ?

The other comment I have is that it might be better put these in now
there are sysfs patches for the tty layer bouncing about to provide the
needed infrastructure ?

Alan
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