Re: [Qemu-devel] [PATCH v4 3/6] hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event

[Lluís Vilanova]

Stefan Hajnoczi writes:

> On Mon, Dec 26, 2016 at 09:34:54PM +0100, Lluís Vilanova wrote:
[...]
>> +
>> +    } else {
>> +        /* proxy to next handler */
>> +        if (segv_next.sa_sigaction != NULL) {
>> +            segv_next.sa_sigaction(signum, siginfo, sigctxt);
>> +        } else if (segv_next.sa_handler != NULL) {
>> +            segv_next.sa_handler(signum);
>> +        }

> Is there a case when no signal handler was installed (i.e. default
> action)?

Sorry, in my previous email I meant no, there is none. If hypertrace is not
initialized, the segv handler will never be installed; otherwise segv_next will
always have one of the two values.


Thanks,
  Lluis