global _target_set # map: target-set-pid -> ancestor-pid

function target_set_pid (pid)
{
	return ([pid] in _target_set)
}

probe begin
{
	if (target())
		_target_set[target()] = stp_pid()
}

probe nd_syscall.fork.return
{
	pid = returnval()
	if (pid in _target_set)
		next
	ppid = pid()
	if (ppid in _target_set)
		_target_set[pid] = ppid
}

probe nd_syscall.exit
{
	delete _target_set[pid()]
}

function target_set_report ()
{
	printf("target set:\n")
	foreach (pid in _target_set+)
		printf("%d begat %d\n", _target_set[pid], pid)
}