VsFTPD uploads files through a virtual user with different Permissions

VsFTPD uses a virtual user to upload files. The permission is different from the setting-Linux Enterprise Application-Linux server application information. For more information, see the following. VsFTPD uploads files through a virtual user with different Permissions
1. In the main configuration file vxftpd. conf: local_umask = 006
2. In the configuration file of a virtual user (User name: vip:
Guest_enable = yes
Guest_username = maomao
Anon_world_readable_only = no
Write_enable = yes
Anon_mkdir_write_enable = yes
Anon_upload_enable = yes
Anon_max_rate = 100000
Local_umask = 006
File_open_mode = 660
Anon_other_write_enable = yes
3, but the permissions for uploading files are:
Maomao @ maoxiaoyun-virtual-machine :~ /Vipftp $ ls-l
Total usage 60
-- W ------ T 1 maomao 87 2012-05-1023:57 getarg. h
-- W ------ T 1 maomao 694 main. c
-- W ------ T 1 maomao 49036 maininclude. c
-- W ------ T 1 maomao 105 writeinfo. h

My problem: according to the information on the Internet, the upload permission should be file_open_mode = 660, that is:-rw ---- Yes. What is the reason? Is my configuration wrong?