Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT_FIXED

[Andi Kleen]

On Wed, Oct 08, 2008 at 09:34:24AM +0100, Alan Cox wrote:
> Oh and as a PS you can also (for the hint case) do this:
> 
> 	shmat giving an address
> 	if error
> 		shmat giving no address
> 
> from user space.

No you can't here because shmat() starts searching from the wrong
start address.

The only way would be to search manually in /proc/self/maps
and handle the races, but I hope you're not advocating that.

-Andi

-- 
ak@xxxxxxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/