Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE_ATTACH

[Denys Vlasenko]

On Mon, Feb 14, 2011 at 6:39 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
>> Ah, I see. Is there any way debugger can distinguish between these two
>> different stops?
>
> IIRC, the (only?) way to distinguish is to check last_siginfo != NULL
> via ptrace(PTRACE_GETSIGINFO).

Right. ptrace(PTRACE_GETSIGINFO) will fail on non-signal-delivery stops.
Thus, it can be used to distinguish different kinds of SIGSTOPs in my example.
-- 
vda
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