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Re: [Xen-users] Problem in linux domU re: /dev/rtc and hwclock

To: Digimer <linux@xxxxxxxxxxx>
Subject: Re: [Xen-users] Problem in linux domU re: /dev/rtc and hwclock
From: Diego Molina <diegoaugustomolina@xxxxxxxxx>
Date: Wed, 13 Jul 2011 08:39:18 -0300
Cc: xen user <xen-users@xxxxxxxxxxxxxxxxxxx>
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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@xxxxxxxxxxx>:
> 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@xxxxxxxxxxx
> 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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