Xen users - Jul 2011 - Problem in linux domU re: /dev/rtc and hwclock

Hi all,

  One of our domU VMs (CentOS 5.6 x86_64) runs a cobol application,
which in turn called ''clock'' to get timestamps. Changing this
is
non-trivial.

  When I try to call ''clock --debug'' I get:

[root@vm0010 ~]# clock --debug
hwclock from util-linux-2.13-pre7
hwclock: Open of /dev/rtc failed, errno=19: No such device.
No usable clock interface found.
Cannot access the Hardware Clock via any known method.

  The device exists:

[root@vm0010 ~]# ls -lah /dev/rtc
crw------- 1 root root 10, 135 Jul 12 18:00 /dev/rtc

  As I understand it, this is (in part?) to prevent domU from altering
dom0''s date/time. Obviously, this is a good thing, but can the device
be
made available to domU VMs in a "read-only" mode?

Thanks!

-- 
Digimer
E-Mail:              digimer@alteeve.com
Freenode handle:     digimer
Papers and Projects: http://alteeve.com
Node Assassin:       http://nodeassassin.org
"I feel confined, only free to expand myself within boundaries."

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Hi, (just to cover things up) may it be possible to change the cobol
instruction to use the system time instead of the hardware time? That
would be like executing `date'' command instead
''hwclock''.

2011/7/12, Digimer <linux@alteeve.com>:
> Hi all,
>
>   One of our domU VMs (CentOS 5.6 x86_64) runs a cobol application,
> which in turn called ''clock'' to get timestamps. Changing
this is
> non-trivial.
>
>   When I try to call ''clock --debug'' I get:
>
> [root@vm0010 ~]# clock --debug
> hwclock from util-linux-2.13-pre7
> hwclock: Open of /dev/rtc failed, errno=19: No such device.
> No usable clock interface found.
> Cannot access the Hardware Clock via any known method.
>
>   The device exists:
>
> [root@vm0010 ~]# ls -lah /dev/rtc
> crw------- 1 root root 10, 135 Jul 12 18:00 /dev/rtc
>
>   As I understand it, this is (in part?) to prevent domU from altering
> dom0''s date/time. Obviously, this is a good thing, but can the
device be
> made available to domU VMs in a "read-only" mode?
>
> Thanks!
>
> --
> Digimer
> E-Mail:              digimer@alteeve.com
> Freenode handle:     digimer
> Papers and Projects: http://alteeve.com
> Node Assassin:       http://nodeassassin.org
> "I feel confined, only free to expand myself within boundaries."
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
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