The return value of xc_map_foreign_range~~~

The return value of xc_map_foreign_range~~~

[张琳]

[-- Attachment #1.1: Type: text/plain, Size: 510 bytes --]

I am shame to say that I have never met a function whose return value is void*.

This is the first time~~~

So, can anyone told me the meaning of the return value of this function -----xc_map_foreign_range?

Is it a pointer pointed to a memory area corresponding the machine frame number(the last parameter passed to the function)?

And the third parameter named size: the unit of size is in bytes or in pages?

Wish you good luck~~~

                                                yours:Lin  


[-- Attachment #1.2: Type: text/html, Size: 3685 bytes --]

[-- Attachment #2: Type: text/plain, Size: 138 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Re: The return value of xc_map_foreign_range~~~

[Derek Murray]

[-- Attachment #1: Type: text/plain, Size: 486 bytes --]

Hi,

2008/3/18 张琳 <zhanglin_nk@tom.com>:
> So, can anyone told me the meaning of the return value of this function
> -----xc_map_foreign_range?
>
> Is it a pointer pointed to a memory area corresponding the machine frame
> number(the last parameter passed to the function)?

That's correct.

> And the third parameter named size: the unit of size is in bytes or in
> pages?

The size parameter is in bytes, and must be a multiple of PAGE_SIZE
(as with mmap).

Regards,

Derek Murray.

[-- Attachment #2: Type: text/plain, Size: 138 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Re: The return value of xc_map_foreign_range~~~

[Daniel Stodden]

On Tue, 2008-03-18 at 19:45 +0800, 张琳 wrote:
> I am shame to say that I have never met a function whose return value
> is void*.

To get used to it, I'd recommend malloc(). Just try it, it opens a whole
world of new and exciting applications. ;)

scnr.

Best,
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