I'd like to write something to automatically backup files as they change on disk. Perhaps not every byte, but say at reasonable intervals and especially when a file is closed.
Does anyone know of any way I could get an indication in a userland process when an arbitrary file has been opened, closed, or modified? I can imagine a special device which I read which just feed me things like: /foo/bar modified /bar/baz close Before everyone bombards me with comments that I'm being completely stupid, I have my reasons for wanting to do this rather than using RAID to create a mirror. What I really want would certainly be best done if I were to write my own file system. But I don't have the time to do that right now. I've been looking long and hard for a sort of roll-back filesystem, but I've never seen this for unix. So, I'd like to create something somewhat close. What I want to do today is backup a file in many different states rather than just once per day. To do that, I need to know when the files change, rather than scanning through the entire file system constantly, hence my question. I realize that there's going to be some overhead to do this, but I suspect that the amount of overhead isn't going to be that much greater than say using RAID to mirror. Ideas and comments welcome... Michael Grant To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
