how does variable num define for errno in libxc

how does variable num define for errno in libxc

[tgh]

hi
i try to modify code of xc_domain_save.c
and there is error, comes out from ERROR("Error when writing to state
file (5)" " (errno %d)", errno);
i am confused about where is the errno defined ,and what does variable
num mean? say errno=104 or errno=26 or some else

Thanks

Re: how does variable num define for errno in libxc

[Daniel Stodden]

On Wed, 2008-03-19 at 11:48 +0800, tgh wrote:
> hi
> i try to modify code of xc_domain_save.c
> and there is error, comes out from ERROR("Error when writing to state
> file (5)" " (errno %d)", errno);
> i am confused about where is the errno defined ,and what does variable
> num mean? say errno=104 or errno=26 or some else

Error numbers are a C library feature. If you're running Linux, check
whether you have installed the base development manual pages and try
'man errno'. Or see a good book on C programming.

good luck,
Daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@cs.tum.edu
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B

Re: how does variable num define for errno in libxc

[tgh]

Thank you
 and man errno ,there is no match or map between num,say 104 and  
consist ,say EBADMSG,  or maybe some book more helpful

 another question
 i am confused about how to use shadow mechanism ,that is, when live 
migration, after shutdown VM,and XEN_DOMCTL_SHADOW_OP_CLEAN, how to make VM
 
 remain in shadow mode XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY?  i have 
modified the code to try to make it as follows
            if ( !(xc_shadow_control(xc_handle, dom, 
XEN_DOMCTL_SHADOW_OP_OFF,
                                     NULL, 0, NULL, 0, NULL) >= 0 &&
                   xc_shadow_control(xc_handle, dom,
                                     XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
                                     NULL, 0, NULL, 0, NULL) >= 0) )

but it seems not to  work , and how to do it ,or  any help

Thanks





Daniel Stodden 写道:
> On Wed, 2008-03-19 at 11:48 +0800, tgh wrote:
>   
>> hi
>> i try to modify code of xc_domain_save.c
>> and there is error, comes out from ERROR("Error when writing to state
>> file (5)" " (errno %d)", errno);
>> i am confused about where is the errno defined ,and what does variable
>> num mean? say errno=104 or errno=26 or some else
>>     
>
> Error numbers are a C library feature. If you're running Linux, check
> whether you have installed the base development manual pages and try
> 'man errno'. Or see a good book on C programming.
>
> good luck,
> Daniel
>
>   

Re: how does variable num define for errno in libxc

[Daniel Stodden]

On Wed, 2008-03-19 at 16:06 +0800, tgh wrote:
> Thank you
>  and man errno ,there is no match or map between num,say 104 and  
> consist ,say EBADMSG,  or maybe some book more helpful

find /usr/include -name errno.h | xargs grep 104

>  another question
>  i am confused about how to use shadow mechanism ,that is, when live 
> migration, after shutdown VM,and XEN_DOMCTL_SHADOW_OP_CLEAN, how to make VM
>  
>  remain in shadow mode XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY?  i have 
> modified the code to try to make it as follows
>             if ( !(xc_shadow_control(xc_handle, dom, 
> XEN_DOMCTL_SHADOW_OP_OFF,
>                                      NULL, 0, NULL, 0, NULL) >= 0 &&
>                    xc_shadow_control(xc_handle, dom,
>                                      XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
>                                      NULL, 0, NULL, 0, NULL) >= 0) )
> 
> but it seems not to  work , and how to do it ,or  any help

Didn't look at this code for a while. no immediate idea, sorry.

regards,
Daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@cs.tum.edu
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B

Re: how does variable num define for errno in libxc

[Tim Deegan]

At 12:11 +0100 on 19 Mar (1205928715), Daniel Stodden wrote:
> >  another question
> >  i am confused about how to use shadow mechanism ,that is, when live 
> > migration, after shutdown VM,and XEN_DOMCTL_SHADOW_OP_CLEAN, how to make VM  
> >  remain in shadow mode XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY?  i have 
> > modified the code to try to make it as follows
> >             if ( !(xc_shadow_control(xc_handle, dom, 
> > XEN_DOMCTL_SHADOW_OP_OFF,
> >                                      NULL, 0, NULL, 0, NULL) >= 0 &&
> >                    xc_shadow_control(xc_handle, dom,
> >                                      XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
> >                                      NULL, 0, NULL, 0, NULL) >= 0) )

If the domain is already in shadow log-dirty mode, and you want it to
remain in shadow log-dirty mode, surely you don't need to do anything at
all?

Cheers,

Tim.
 
-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

hg clone parallax

[tgh]

hi
  i try to hg clone parallax from 
http://dsg.cs.ubc.ca/parallax/hg/parallax-devel ,but failed, how could i 
get it? did someone succeed in hg clonning it? where else could i get it?



Thanks