lkml.org 
[lkml]   [2012]   [Feb]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] ptrace: add ability to get clear_tid_address
On Fri, Feb 03, 2012 at 02:11:23PM +0300, Andrew Vagin wrote:
> Zero is written at clear_tid_address, when the process exits.
> This functionality is used by pthread_join().
>
> sys_set_tid_address() changes this address for current task.
>
> Before this patch clear_tid_address could not be got from user space.
> I want to dump a full state of a task, so I need this address.
> Also I think it may be useful for debugging a multithreading program.
>
> I am not sure that ptrace is suitable place. It may be added in prctl,
> but I think it's a bit useless and strange. I can't image a real
> situation (avoid checkpointing) when a thread will want to get own
> clear_tid_address from itself, this address is used by parent ussually.
>
> Signed-off-by: Andrew Vagin <avagin@openvz.org>

Ummm... this really doesn't fit in ptrace. Cyrill, why not put it
together with other params you're exporting?

Thanks.

--
tejun


\
 
 \ /
  Last update: 2012-02-03 17:27    [W:0.092 / U:0.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site