deleting automatically the oldest file from a harddisk

[Koen de Wijs]

Hello everybody,

I have a ftp -server. I use a harddisk of  9 Gb for the ftp-directory.

This isn't very big so I want to throw away the oldest file if the disc 
is full.

I can write a cronjob that checks every minute. But isn't there another 
solution;
Can't I just write a C program that listens to some systemcalls and 
automatically deletes the oldest file if the harddisk is full???

I hope someone can help me?

Thanks,

Koen