linux-kernel - Re: [patch 4/4] timerfd.2: Add ioctl method description

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Message-ID: <552C1F64.30202@gmail.com>
Date:	Mon, 13 Apr 2015 21:56:20 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
CC:	mtk.manpages@...il.com, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Vagin <avagin@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [patch 4/4] timerfd.2: Add ioctl method description

Hello Cyrill,

On 07/15/2014 11:54 PM, Cyrill Gorcunov wrote:
> ioctl(2)
> 	The following commands are supported: TFD_IOC_SET_TICKS to adjust
> 	the number of the timer expirations that have occurred.
> 	It take a pointer to nonzero 8-byte integer (uint64_t*) containing
> 	new number of expirations. Once the number is set any waiter on
> 	the timer is woken up. The only purpose of this command is to restore
> 	the expirations in a sake of checkpoint/restore procedure.
> 	It requires the kernel to be built with CONFIG_CHECKPOINT_RESTORE
> 	support.

Late... but, patch applied. Thank you.

Cheers,

Michael


> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> CC: Michael Kerrisk <mtk.manpages@...il.com>
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: Andrey Vagin <avagin@...nvz.org>
> CC: Pavel Emelyanov <xemul@...allels.com>
> CC: Vladimir Davydov <vdavydov@...allels.com>
> CC: linux-api@...r.kernel.org
> ---
>  man2/timerfd_create.2 |   14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> Index: man-pages/man2/timerfd_create.2
> ===================================================================
> --- man-pages.orig/man2/timerfd_create.2
> +++ man-pages/man2/timerfd_create.2
> @@ -260,6 +260,20 @@ multiplexing APIs:
>  and
>  .BR epoll (7).
>  .TP
> +.BR ioctl "(2)"
> +The following commands are supported:
> +.B TFD_IOC_SET_TICKS
> +to adjust the number of the timer expirations that have occurred.
> +It take a pointer to nonzero 8-byte integer
> +.RI ( uint64_t *)
> +containing the new number of expirations.
> +Once the number is set any waiter on the timer is woken up.
> +The only purpose of this command is to restore the expirations
> +in a sake of checkpoint/restore procedure.
> +It requires the kernel to be built with
> +.BR CONFIG_CHECKPOINT_RESTORE
> +support.
> +.TP
>  .BR close (2)
>  When the file descriptor is no longer required it should be closed.
>  When all file descriptors associated with the same timer object
> 
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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