linux-kernel - Re: Kevent POSIX timers support.

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Message-ID: <456B2C82.7040700@redhat.com>
Date:	Mon, 27 Nov 2006 10:20:50 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	David Miller <davem@...emloft.net>, Andrew Morton <akpm@...l.org>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Chase Venters <chase.venters@...entec.com>,
	Johann Borck <johann.borck@...sedata.com>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Alexander Viro <aviro@...hat.com>
Subject: Re: Kevent POSIX timers support.

Evgeniy Polyakov wrote:
>> We need to pass the data in the sigev_value meember of the struct 
>> sigevent structure passed to timer_create to the caller.  I don't see it 
>> being done here nor when the timer is created.  Do I miss something? 
>> The sigev_value value should be stored in the user/ptr member of struct 
>> ukevent.
> 
> sigev_value was stored in k_itimer structure, I just do not know where
> to put it in the ukevent provided to userspace - it can be placed in
> pointer value if you like.

sigev_value is a union and the largest element is a pointer.  So, 
transporting the pointer value is sufficient and it should be passed up 
to the user in the ptr member of struct ukevent.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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