Re: rollover translator

[Ognyan Kulev]

Alfred M. Szmidt wrote:
> I got this funky idea today, but I'm not sure what would be the best
> way to implement it.  What it would essentially do is provide a
> "circular file", so when you get to the end of the file you start from
> position 0.  With the nice option that if you do roll over, you can
> clear the all stored contents and re-start with a "blank file".

I'm not sure if POSIX allows filesystem (by its own will) to change file 
offset of user file descriptor.

Another possible implementation is to use sparse blocks: keeping 
everything before the last X bytes to be sparse blocks.  So file will be 
huge, but only the part we are interested in is saved physically.  But I 
think we don't have RPC that make sparse blocks inside file, not sure 
though.

Regards,
ogi