PSL_TRACEVFORK_DONE
return (p->p_slflag & (PSL_TRACEVFORK_DONE|PSL_TRACED)) ==
(PSL_TRACEVFORK_DONE|PSL_TRACED) && (flags & FORK_PPWAIT);
pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEVFORK_DONE) ?
SET(t->p_slflag, PSL_TRACEVFORK_DONE);
CLR(t->p_slflag, PSL_TRACEVFORK_DONE);