lkml.org 
[lkml]   [2012]   [Dec]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] uio: do not expose inode to uio open/release hooks
On Tue, Dec 11, 2012 at 03:20:32PM -0800, Greg KH wrote:
> On Wed, Dec 12, 2012 at 12:12:02AM +0100, Benedikt Spranger wrote:
> > The inode parameter is unused by in kernel users of UIO.
>
> Ok.
>
> > Also the inode parameter makes it hard to resolve the existing open(),
> > mmap() and close() difficulty.
>
> I don't understand, what do you mean by this? What is this parameter
> causing problems with?

The problem is that according to POSIX, it is guaranteed that in userspace
you can do

fd = open("/dev/uio0", ...)
ptr = mmap(...fd...)
close(fd)

with ptr still being valid and useable after that.

Thanks,
Hans


\
 
 \ /
  Last update: 2012-12-12 03:21    [W:1.553 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site