Thank you for the information and advice. Of course I don't want to "avoid" Apple's check, and I'm in trouble that they don't permit that kind of stat() use now... Once they put that into effect, please let us know what happens. Actually, I'm scared to supply such kind of information here... So sorry, please let me keep silence... Did you submit a request for a new approved reason? Not yet, but I think I will do that. Thanks.

Thank you for your answer. I understand your point, but it is difficult for me to decide to allow attackers to hook APIs I use for security purpose... I make efforts to protect my apps against attackers. And I believe that there are other people making similar efforts. I hope Apple Team understands such efforts of people.