Re: [PATCH] ptrace: add ability to retrieve signals withoutremoving them from a queue

From: Oleg Nesterov
Date: Fri Feb 15 2013 - 14:45:27 EST

On 02/15, Pedro Alves wrote:
> Not sure I'm reading the patch right, but it looks like GDB would
> be able to use this as alternative to PTRACE_GET_SIGINFO variant

No, it is different. PTRACE_GETSIGINFO reports the siginfo for the signal
which was already dequeued (ignoring the fact ->last_siginfo != NULL doesn't
necessarily mean we report a signal), while this patch allows to look at
the pending signals which were not reported yet.

> I wouldn't mind if this was added unconditionally
> instead of wrapped on CONFIG_CHECKPOINT_RESTORE.

I agree. If you think gdb can use this new feature, CONFIG_ can go away.

> We'd miss the poke
> variant, but that looks like something that could be always be added
> later.

Yes. _POKE_ or _QUEUE_ or _DEQUEUE_, we can add more features if user-
space wants them.


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