Messages in this thread | | | Date | Fri, 3 Feb 2012 08:25:19 -0800 | From | Tejun Heo <> | Subject | Re: [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
| |