Stefan Hajnoczi writes:
> On Mon, Jan 16, 2017 at 06:05:26PM +0100, Lluís Vilanova wrote:
>> 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)?
>>
>> Yes, before calling hypertrace_init() or if it is called without a
>> "hypertrace_base" argument set (i.e., the user has not enabled hypertrace in
>> the
>> command line).
> I meant "what happens if !segv_next.sa_action &&
> !segv_next.sa_handler?". The default signal disposition should take
> effect. This code is ignoring that case, turning everything into
> SIG_IGN but there is also SIG_DFL.
I see, I didn't take SIG_DFL and SIG_IGN into account, and if both are null (no
handler was installed by the user), I should cleanup my handler and raise() the
signal again to let it go through its default system action.
Sorry for the overall messy patch.
Thanks,
Lluis
