[PATCH 40] PTRACE_EVENT_VFORK_DONE: set ev_options = PTRACE_O_TRACEVFORKDONE

[Roland McGrath]

> ptrace_report_clone() still needs more changes. I think it is simple to
> fix it now, but can't we simplify the utrace's behaviour first?
> 
> utrace_report_clone() does not set utrace->vfork_stop without CLONE_VFORK,
> this adds some complications. Perhaps we can kill CLONE_VFORK check?

Please explain exactly what difference you want to see in the utrace API.
Just talking about implementation details is confusing.

The API today is that UTRACE_STOP from report_clone always guarantees a
prompt stop.  For CLONE_VFORK, that means it has to stop before the
vfork-wait, so before syscall-exit.  Without CLONE_VFORK, the usual rule
applies: nothing user-visible happens until returning to user mode, so
there is no stop.  Well, the one user-visible thing that happens is the
return value register getting set (right before the syscall-exit event).


Thanks,
Roland