linux-kernel - Re: [patch 3/3] timerfd: Implement write method

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.02.1405220656130.9695@ionos.tec.linutronix.de>
Date:	Thu, 22 May 2014 06:58:19 +0900 (JST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
cc:	LKML <linux-kernel@...r.kernel.org>, shawn@...rchofgit.com,
	Andrew Morton <akpm@...ux-foundation.org>, avagin@...nvz.org,
	xemul@...allels.com, vdavydov@...allels.com,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [patch 3/3] timerfd: Implement write method

On Thu, 22 May 2014, Thomas Gleixner wrote:

> On Tue, 29 Apr 2014, Cyrill Gorcunov wrote:
> > +
> > +static ssize_t timerfd_write(struct file *file, const char __user *buf,
> > +			     size_t count, loff_t *ppos)
> > +{
> > +	struct timerfd_ctx *ctx = file->private_data;
> > +	u64 ticks = 0;
> > +
> > +	if (count < sizeof(ticks))
> > +		return -EINVAL;
> > +
> > +	if (get_user(ticks, (u64 __user *) buf))
> > +		return -EFAULT;
> > +
> > +	spin_lock_irq(&ctx->wqh.lock);
> > +	ctx->ticks = ticks;
> 
> So what wakes a potential waiter in read/poll?

And who is updating timerfd_create(2) ?

Thanks,

	tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/