NcFTPd general.cf file configuration
Don't forget to restart NcFTPd after modifying the general.cf file.
By default, NcFTPd does not lock a file in the process of downloading. If you want to be sure that remote users do not download files that are in the process of uploading, you can set this option to yes to request that NcFTPd use advisory file locking.
Note that this option does not do anything useful unless you also set lock-uploads to yes.