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

From: Alan Cox
Date: Thu Sep 13 2012 - 08:47:39 EST

> +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 ?

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