clayborg added a comment.
In D129521#3653770 <https://reviews.llvm.org/D129521#3653770>, @jingham wrote:
>
> If that seems right, then for now you want to just ensure that the vfork is
> allowed to continue while lldb follows the parent. In that case, this isn't
> quite the right way to do it. If all you do is to say that the function call
> plan doesn't explain the stop, then everybody else above you on the
> ThreadPlanStack gets a whack at the stop event. Maybe one of them is waiting
> for a vfork stop for some other reason so they would react to this stop,
> which isn't, I think, what you wanted. You actually want the expression to
> claim responsibility for the vfork, but also force the process to continue.
Actually we do need all of the stuff above us to get a chance to handle this
because it needs to respond and detach from the child process. See more below
> This situation is pretty much the same as for breakpoints when we're ignoring
> breakpoint hits in expressions. The way that works is that
> DoPlanExplainsStop says it does explain the stop, but then it overrides the
> real stop info's "should stop" to force it to auto-continue. In the
> breakpoint case this is in the `if (m_ignore_breakpoints)` branch around
> line 315:
>
> if (m_ignore_breakpoints) {
> LLDB_LOGF(log,
> "ThreadPlanCallFunction::PlanExplainsStop: we are ignoring "
> "breakpoints, overriding breakpoint stop info ShouldStop, "
> "returning true");
> m_real_stop_info_sp->OverrideShouldStop(false);
> return true;
> }
>
> That way nobody else gets a look at the stop, which is I'm pretty sure what
> you want here, but when we get to deciding what to do in the ShouldStop
> negotiation, we'll continue because we forced the relevant StopInfo to do
> that.
I tried doing this and it stops everything from working. Fork handling needs to
detach from the child process. I tried doing what you suggested above, but then
none of that fork machinery gets invoked correctly and things go really south
quickly.
Repository:
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https://reviews.llvm.org/D129521/new/
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