Re: [patch 4/4] timerfd.2: Add ioctl method description
From: Michael Kerrisk (man-pages)
Date: Mon Apr 13 2015 - 15:56:36 EST
On 07/15/2014 11:54 PM, Cyrill Gorcunov wrote:
> 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
Late... but, patch applied. Thank you.
> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> CC: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
> CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: Andrey Vagin <avagin@xxxxxxxxxx>
> CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> CC: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
> CC: linux-api@xxxxxxxxxxxxxxx
> 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:
> .BR epoll (7).
> +.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
> .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
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